NORTHERN INSTITUTIONAL FUNDS
N-30D, 1999-08-03
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<PAGE>

Northern Institutional Funds


                  FIXED INCOME AND EQUITY PORTFOLIOS




                                                                    MAY 31, 1999

                              Semi-Annual Report
<PAGE>

Northern Institutional Funds
Fixed Income and Equity Portfolios

- --------------------------------------------------------------------------------

Table of Contents

<TABLE>
<CAPTION>
                                                                            Page
                                                                            ----
<S>                                                                         <C>
Investment Strategy........................................................   2
Fixed Income Portfolios
  Statements of Investments
    Bond Portfolio.........................................................   6
    Intermediate Bond Portfolio............................................   8
    International Bond Portfolio...........................................  10
    Short-Intermediate Bond Portfolio......................................  11
    U.S. Government Securities Portfolio...................................  13
    U.S. Treasury Index Portfolio..........................................  14
  Statements of Assets and Liabilities.....................................  15
  Statements of Operations.................................................  16
  Statements of Changes in Net Assets......................................  18
  Financial Highlights.....................................................  20
Equity Portfolios
  Statements of Investments
    Balanced Portfolio.....................................................  26
    Diversified Growth Portfolio...........................................  29
    Equity Index Portfolio.................................................  31
    Focused Growth Portfolio...............................................  38
    International Equity Index Portfolio...................................  40
    International Growth Portfolio.........................................  51
    Small Company Index Portfolio..........................................  53
  Statements of Assets and Liabilities.....................................  73
  Statements of Operations.................................................  74
  Statements of Changes in Net Assets......................................  76
  Financial Highlights.....................................................  78
Notes to the Financial Statements..........................................  85
</TABLE>

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                                       1
<PAGE>

Northern Institutional Funds
Fixed Income and Equity Portfolios
- -------------------------------------------------------------------------------
Investment Strategy

<TABLE>
<CAPTION>
                                                               Month to Year to
                                                                Month     Date
                                                               % Change % Change
                                                               -------- --------
<S>                                                            <C>      <C>
DJIA..........................................................   3.9      19.5
S&P 500.......................................................   5.4      11.7
S&P 400 MidCap................................................   5.3       6.2
NASDAQ Index..................................................   8.7      22.5
Russell 2000..................................................   4.3       8.5
Japan Topix...................................................   9.6      30.3
London FTSE...................................................   1.5       7.4
German DAX....................................................   6.1       7.5
DJ World......................................................   4.9       8.4
</TABLE>

What Has Changed
 . The Federal Reserve raised the federal funds rate by 25 basis points and
  returned its bias for future interest rate actions to neutral.
 . Chairman Greenspan indicated that the monetary authority's "speed limit" for
  the U.S. economy has been increased to 3% from 2.5%.
 . May's consumer price index (CPI) was reported below expectations with 1999's
  "core" CPI slowing from year-ago levels.
 . Expectations of a global recovery strengthened amid continued mixed economic
  data.

World Economic Growth is Picking Up
 . U.S. domestic demand is expected to moderate as foreign demand recovers.
 . Stronger-than-expected economic growth and higher industrial commodity
  prices have caused inflationary expectations to rise.

Bond Investors' Concerns Appear Overdone
 . The Federal Reserve's focus on moderating domestic growth is likely to cause
  near-term market volatility to increase.
 . Despite cyclical concerns, the secular inflation outlook remains
  constructive.
 . Neutral portfolio durations are still recommended.

Maintain Equity Exposure at Low End of Strategic Range
 . Mega-cap stocks are likely to underperform.
 . Mid- and smaller-cap stocks should respond favorably to a global economic
  pickup and valuations are supportive.

Foreign Equities are Relatively Attractive
 . European markets should thrive on an expected pickup in earnings growth next
  year.
 . Asian markets will continue their recovery as growth and earnings accelerate
  into 2000.

Conclusions: 12-18 Month Horizon
 . Equity exposure is at strategic minimums.
 . Maintain a slight overweight in bonds.
 . Cash positions are slightly above strategic norms.

Economic Outlook
WORLD ECONOMIC GROWTH IS PICKING UP
Continued increases in real income and capital gains in both the stock and
housing markets have combined to support strong household spending. Strength
in household demand and improved corporate profits have kept business
investment spending robust. In addition, some capital goods expenditures may
have been brought forward in the year because of year 2000 compliance issues.
The rise in mortgage rates in recent months is expected to slow down the
residential real estate sector. Mortgage rate increases also would be expected
to deter existing homeowners from tapping the equity that they have built up
in their houses. Home-equity withdrawal appears to have been important in
fueling consumer spending. While these elements of domestic demand moderate,
foreign demand appears to be strengthening. A number of East Asian economies
have entered a recovery phase, including the Japanese economy. European Union
economies are either exhibiting a reacceleration in growth or continue to grow
at a relatively high rate. One region, however, that remains very weak is
South America.
  Prices of industrial commodities have started to move higher. To a large
degree, the sharp increase in the prices of petroleum products is the result
of production cuts by the Organization of Petroleum Exporting Countries
(OPEC). The recovery of the global economy, however, also has contributed to
oil price increases, as well as to the continued rise in the prices of wood
products and the rebound in the prices of industrial metals. Higher commodity
prices have resulted in the firming of intermediate goods prices. This rise in
commodity prices in combination with stronger-than-expected global economic
growth has raised inflationary expectations. To date,

                                       2
<PAGE>

- -------------------------------------------------------------------------------
however, there has been no acceleration in the prices of final goods and
services when the effects of higher energy prices are excluded.
  With the continued strength in domestic demand and the nascent recovery in
foreign demand, the Federal Reserve has increased its target federal funds
rate by 25 basis points to 5% in an effort to preempt any rise in underlying
inflation. The FOMC has moved back to a neutral policy stance and has
indicated that strong aggregate demand for goods and services and "tight"
labor markets alone would not necessarily trigger further near-term Federal
Reserve actions to raise interest rates. Rather, the central bank's comments
imply that the decision whether to push interest rates higher would depend
more on the behavior of factors with a closer link to inflation than economic
growth or the rate of unemployment. Of course, investors may have some
difficulty taking the Federal Reserve's "neutral" bias at face value, given
that the monetary authority just raised interest rates by 25 basis points
without any real inflationary justification.

Fixed Income Outlook
BOND INVESTORS' CONCERNS APPEAR OVERDONE
U.S. government bond yields rose further in the second quarter, eventually
breaching the top end of the 5.25% to 5.75% range which we had viewed as a
reasonable estimate of the near-term trend of interest rates. The yield curve
flattened by 20 basis points between the 2-year Treasury note and the 30-year
Treasury bond as the market correctly anticipated the Federal Reserve's move
to reverse a portion of the monetary easing initiated last fall. The central
bank's move to tighten credit, clearly telegraphed in Chairman Greenspan's
forthright testimony to Congress, indicated that the primary barometer guiding
its policy actions had shifted away from measured inflation, which remains
subdued, toward the pace of U.S. economic growth, which continues to be brisk.
In fact, we believe that bond yields moved above the high end of our trading
range because domestic growth has not slowed to the degree we had expected.
More precisely, we did not foresee the importance the Federal Reserve would
place on moderating domestic growth despite an absence of building
inflationary pressures. The central bank's shift in focus clearly had a
negative impact on investor psychology as this new information brought
significant uncertainty to a bond market that thought it had a pretty good
handle on Greenspan & Co.'s concerns. Nevertheless, over the long run, we
believe it is inflation, not growth, which is the more important driver of
interest rates, and we remain constructive on the inflation front.
  During the second quarter, most of the favorable fundamentals which have
fueled the highly desirable three-year trend of low-inflationary growth
remained firmly in place: cost pressures were subdued, employment expanded,
productivity remained high, and corporate earnings showed signs of
strengthening. The ongoing benefits from this constructive growth dynamic
cannot be overemphasized. For example, updated White House budget projections
now show an additional $20 billion improvement in the U.S. government's fiscal
surplus in the coming year and $180 billion extra over five years. While the
accuracy of longer-term revenue projections is always suspect, the fact is
that robust, non-inflationary growth has paid big dividends on the fiscal
front, and, should this trend continue, it would bring us significant benefits
in the future. Real growth, of course, delivers a host of favorable financial,
social, and political outcomes, the likes of which all segments of society
would like to see continue.
  The "new-era" economic view sees strong growth as being compatible with low
inflation in part due to technological advances, global competition, and
stable monetary policy. In the past, Alan Greenspan has indicated his support
for many of these "new-era" beliefs. However, in his recent testimony, he
articulated a new policy predicated upon slowing the growth of the U.S.
economy down to a "speed limit" of around 3% in order to prevent "inevitable"
wage increases brought on by tightness in the labor market. Unfortunately, we
think that this shift in focus is likely to add an element of uncertainty to
the central bank's policymaking which will result in a more volatile bond
market. Because investors cannot know the degree of policy tightening
necessary to produce the pace of economic growth acceptable to the Federal
Reserve, we expect that they will overscrutinize each and every data release
pertaining to the economy. These individual economic reports, of course,
always contain a fair degree of noise, hence our expectation that near term
market volatility is likely to remain high. So, while we do not share the
chairman's concerns that the U.S. economy is nearing a breaking point and
continue to believe that longer-term inflation will remain benign, we fully
respect the new uncertainty the Federal Reserve's shift in focus has brought
to the bond market and, in turn, have embraced a wait-and-see outlook for
interest rates over the near horizon. An

                                       3
<PAGE>

Northern Institutional Funds
Fixed Income and Equity Portfolios
- -------------------------------------------------------------------------------
Investment Strategy--Continued
attempt to "fine-tune" the U.S. economy down to a 3% rate of growth,
particularly when inflationary pressures remain non-threatening, may provide
very little benefit and could ultimately lead to renewed global economic and
financial problems. Consequently, we recommend maintaining neutral portfolio
durations while awaiting further evidence that the fundamental factors
underpinning the economy's favorable growth/inflation dynamic remain in place.

Equity Outlook
MAINTAIN EQUITY EXPOSURE AT LOW END OF STRATEGIC RANGE
Several interesting observations can be made regarding the first half of 1999.
Growth in the U.S. economy certainly surprised on the upside versus the
consensus forecast, which had called for a slowdown. Industrial prices rose
from depressed levels, and, in conjunction with solid growth, caused bonds to
suffer. Equities balanced better growth with higher rates to result in an 11%
gain for the initial six months of the year, but since the S&P 500 was up over
6% by mid-January, the past five-and-a-half months saw limited progress. Upon
closer examination, industrial, technology, and mid- and small-capitalization
stocks performed well in the past quarter so an initial change in leadership
could be under way. All in all, stocks fared well in the face of rising long
and short rates.
  We remain concerned about the 25 to 50 largest stocks in the market, which,
we feel, are 15% to 30% overvalued as a group. However, using similar
methodology, the balance of the S&P 500 appears to be just modestly expensive
(maybe 10% overvalued) while mid- and small-capitalization stocks actually
look undervalued. Thus, while the popular S&P 500 in total looks expensive, we
remain convinced that a narrow group of extended leadership stocks comprises
the majority of the valuation excess and thus the risk. We think these stocks
will underperform for some time and have recommended that 15% of these assets
be redeployed.
  It might be helpful to recount our shifts in asset allocation since early
1999 to put the first half into perspective. In January we moved 5% from
megacapitalization stocks to cash, and in late March we shifted an additional
5% from the same stock class into midcapitalization issues. In May, we
transferred another 5% from megacapitalization stocks to cash. The net result
was to reduce our exposure to megacapitalization stocks by 15%, deploying 10%
to cash reserves and 5% to midcapitalization stocks. This now leaves our
recommended equity asset allocation at minimum levels compared with our
strategic norms.
  These moves in asset allocation reflect our concern with valuations of
megacapitalization stocks. However, the S&P 500 has continued to move higher
in the face of rising interest rates due to stronger economic growth and
better-than-expected earnings. Longer term, though, we believe that returns on
equities will revert toward the norm from the outstanding returns achieved
over the past four years of greater than 20% each year, something never
previously achieved in the U.S. market. If the large-capitalization stocks
drag the averages down over the near to intermediate term, we may well deploy
cash reserves into the small- or midcapitalization arena where we expect
longer-term leadership to emerge.
  In our opinion, small- and mid-capitalization stocks should benefit from the
pickup in world economic growth detailed earlier and yet they sell at
valuations that are much more appealing. Many attractive issues sell for 15 to
20 times earnings per share versus 28 times for the S&P 500 and over 40 times
for the top-growth stocks in that index. The shift toward these names will
unfold slowly, perhaps even over another year or more, but should result in
solid intermediate-term performance. While we think that positions in
megacapitalization stocks should be reduced, we also see excellent
opportunities in small-capitalization, mid-capitalization, and international
stocks that should absorb a portion of the funds raised.

Global Outlook
FOREIGN EQUITIES ARE RELATIVELY ATTRACTIVE
European markets rose between 5% and 15% in the first half of the year with an
average gain of about 8%. Given that the new currency, the euro, lost about
11% of its value over the same period, U.S.-dollar-based investors generally
were no better off than they were at the end of 1998. However, Latin American
and Asian markets were up between 15% and 35%, averaging over 20% in U.S.
dollars, a strong first-half gain. Japan was by far the best major market, up
30% locally and 23% in U.S dollars. Asia outpaced Europe substantially in
dollar returns, reversing several years of poor performance under way since
the mid-1990s.
  We think European growth is set to surprise positively in the second half of
1999 as rate cuts and the weaker euro

                                       4
<PAGE>

- -------------------------------------------------------------------------------
lead to a nice recovery. This recovery, in turn, will cause earnings upgrades
which should fuel a rally in the second half of the year, but it will probably
come later in the year due to the typical seasonal slump in the summer as
Europeans go on vacation. With earnings set to rise both this year and next,
and with valuations less stretched than in the U.S., the European bull run of
the past two years could gain additional vigor. Add in potential benefits from
corporate restructuring and plenty of positive surprises are possible in
Europe on a two-year perspective.
  Despite its strong recovery over the past nine months, Asia, we believe,
still has above-average investment merit. The intensity of the economic upturn
will not be strong by past standards, but most investors will underestimate
the coming profit surge led by restructuring in Japan as well as in South
Korea and elsewhere in Southeast Asia. Markets typically move in response to
profit growth, not economic growth, and we think that the profit recovery will
be more intense than the economic numbers suggest.
  Japan surprised with its recovery in gross domestic product, and, while
skeptics abound, it looks like the economy is back on a growth path after two
years of recession. Also, one of the best leading indicators for Japan in the
past has been the performance of small-capitalization stocks. Given that the
prices of these equities have doubled since year-end, signs point to a
continued upside surprise in Japan, which has further bullish implications for
the rest of Asia. Since Japan's economy is by far the largest in the region
and because the country imports goods from all across Asia, the recovery in
Japan is indeed good news for the entire region. While occasional setbacks are
to be expected, we continue to see Asia as one of the best longer-term
investment stories in the world today.

                                                                     July, 1999

                                       5
<PAGE>

Northern Institutional Funds
Fixed Income Portfolios
- --------------------------------------------------------------------------------
Statements of Investments
May 31, 1999
(All amounts in thousands, except shares)
(Unaudited)
<TABLE>
<CAPTION>
           Description
- -----------------------------------------------
 Principal               Maturity
  Amount   Rate            Date    Value
- -----------------------------------------------
                                 Bond Portfolio
 <C>       <S>           <C>      <C>
 ASSET-BACKED SECURITIES--12.7%
 Auto--3.5%
           Banc One Auto
           Grantor Trust,
           Series 1997-B, Class
           A
 $ 8,066     6.29%        7/20/04 $  8,109
           WFS Financial Owner
           Trust,
           Series 1997-A, Class
           A-3
   4,062     6.50         9/20/01    4,078
           Series 1997-D, Class
           A-3
  15,058     6.25         3/20/02   15,118
                                  --------
                                    27,305
                                  --------
 Home Equity Loans--6.1%
           Contimortgage Home
           Equity Loan Trust,
           Interest Only
           Stripped Security,
           Series 1998-1, Class
           A10I
      --     6.50         9/15/00    7,560
           Contimortgage Net
           Interest Margin
           Notes,
           Series 1998-A, Class
           A(/1/)
   6,224     7.92         3/16/28    6,058
           Series 1996-9, Class
           A-6
   7,300     7.69         1/15/28    7,464
           Series 1997-6, Class
           B-1
   7,300     7.17         1/15/29    6,837
           IMC Excess Cashflow
           Securities Trust,
           Series 1997-A, Class
           A(/1/)
  10,938     7.41        11/26/28   10,085
           Lehman Brothers
           Commercial Conduit
           Mortgage Trust,
           Series 1999-C1,
           Class A-2
   9,345     6.78         4/15/09    9,435
                                  --------
                                    47,439
                                  --------
 Special Purpose--1.1%
           Bunge Trade
           Ltd.(/1/)
   8,370     9.25          5/1/02    8,262
                                  --------
 Utilities--2.0%
           California
           Infrastructure &
           Economic
           Development, Series
           1997-1, Class A4
  15,785     6.22         3/25/04   15,805
- -----------------------------------------------
 TOTAL ASSET-BACKED SECURITIES
  (Cost $106,774)                 $ 98,811
- -----------------------------------------------
 COLLATERALIZED MORTGAGE OBLIGATIONS--
  12.9%
           Commercial Mortgage
           Asset Trust,
           Series 1999-C1,
           Class A-3
 $ 6,815     6.64%        9/17/10 $  6,679
           Credit Suisse First
           Boston Mortgage
           Securities Corp.,
           Series 1998-C2,
           Class A-1
   9,421     5.96        12/15/07    9,210
           Delta Funding Corp.,
           Interest Only
           Stripped
           Security, Series
           1991-1, Class A-4(/1/)
      --    18.00          1/1/06        7
</TABLE>
<TABLE>
<CAPTION>
           Description
- -----------------------------------------------
 Principal               Maturity
  Amount   Rate            Date         Value
- -----------------------------------------------
 <C>       <S>           <C>           <C>
           Donaldson, Lufkin, &
           Jenrette
           Mortgage Acceptance
           Corp.,
           Series 1994-Q8,
           Class 2-A1
 $ 2,735     7.25%        5/25/24      $  2,764
           Donaldson, Lufkin, &
           Jenrette
           Mortgage Acceptance
           Corp.,
           Adjustable Rate,
           Interest Only
           Stripped
           Security, Series
           1995-QE9, Class S
      --     6.48        11/25/25           329
           Donaldson, Lufkin, &
           Jenrette
           Mortgage Acceptance
           Corp.,
           Adjustable Rate,
           Interest Only
           Stripped
           Security, Series
           1996-CF2, Class
           S(/1/)
      --     7.50        11/12/21         5,533
           First Union-Lehman
           Brothers-Bank of
           America Commercial
           Mortgage Trust,
           Series 1998-C2,
           Class A-2
  11,840     6.56        11/18/08        11,715
           Lehman FHA Title
           Loan Trust,
           Interest Only
           Stripped Security,
           Series 1996-2, Class
           S
      --     0.586        5/25/17         1,784
           Morgan Stanley
           Capital I,
           Series 1998-WF1,
           Class A2
  20,000     6.55        12/15/07        19,674
           Mortgage Capital
           Funding, Inc.,
           Series 1998-MC1,
           Class A-2
   5,000     6.66         1/18/08         4,985
           Nationslink Funding
           Corp.,
           Series 1999-1, Class
           A-2
  29,400     6.316       11/20/08        28,544
           PNC Mortgage
           Securities Corp.,
           Series 1996-PR1,
           Class A(/1/)
   6,151     7.05         4/28/27         6,389
           Residential Asset
           Securitization
           Trust,
           Series 1997-A8,
           Class A-3
   2,470     7.00        10/25/27         2,467
- -----------------------------------------------
 TOTAL COLLATERALIZED MORTGAGE
  OBLIGATIONS--(Cost $103,201)         $100,080
- -----------------------------------------------
 CORPORATE/FOREIGN GOVERNMENT
  BONDS/NOTES--15.8%
 Auto--2.0%
           Ford Motor Credit
           Co.
 $15,880     5.75%        2/23/04      $ 15,417
                                       --------
 Beverages--2.0%
           Coca-Cola (The) Co.
  14,935     6.70        10/15/36        15,113
                                       --------
 Insurance--2.7%
           Anthem
           Insurance(/1/)
   6,000     9.00          4/1/27         6,069
           Lumberman's Mutual
           Casualty Co.
   7,050     9.15          7/1/26(/1/)    7,765
   4,830     8.30         12/1/37         4,783
   1,960     8.45         12/1/37(/1/)    1,940
                                       --------
                                         20,557
                                       --------
</TABLE>

See accompanying notes to financial statements.

                                       6
<PAGE>

- -------------------------------------------------------------------------------
<TABLE>
<CAPTION>
           Description
- ------------------------------------------

 Principal               Maturity
  Amount   Rate            Date    Value
- ------------------------------------------
 <C>       <S>           <C>      <C>
 Sanitary Services--2.0%
           Waste Management,
           Inc.
 $15,300     7.10%         8/1/26 $ 15,624
                                  --------
 Sovereign--2.6%
           Asian Development
           Bank
  20,360     6.375        10/1/28   20,602
                                  --------
 Telephone--3.9%
           AT&T Corp.
  17,470     6.00         3/15/09   16,732
           MCI WorldCom, Inc.
  13,435     6.125        8/15/01   13,422
                                  --------
                                    30,154
                                  --------
 Transportation Services--0.6%
           Burlington Northern
           Santa Fe Corp.
   5,000     6.53         7/15/37    4,894
- ------------------------------------------
 TOTAL CORPORATE/FOREIGN GOVERN-
  MENT BONDS/NOTES--(Cost
  $126,180)                       $122,361
- ------------------------------------------
 U.S. GOVERNMENT AGENCIES--16.3%
 Fannie Mae REMIC Trust--8.4%
           Series 1992-73,
           Class G
 $ 1,021     7.50%        4/25/21 $  1,021
           Interest Only
           Stripped Securities,
           Series 278, Class 2
      --     1.25          8/1/25    1,024
           Series 1997-20,
           Class IO
      --     1.84         3/25/27    2,222
           Pool #452421
  31,695     6.00         12/1/28   30,140
           Pool #452480
  31,960     6.00         11/1/28   30,392
           Principal Only
           Stripped Securities,
           Series 1994-9, Class
           G
     119     5.15        11/25/23      114
                                  --------
                                    64,913
                                  --------
 Fannie Mae--6.0%
           Fannie Mae
  24,695     5.625        5/14/04   24,267
  24,145     5.25         1/15/09   22,523
                                  --------
                                    46,790
                                  --------
 Freddie Mac REMIC Trusts--1.9%
           Pool #252649
       1     6.50          6/1/04        1
           Pool #C18118
  15,605     6.00         11/1/28   14,849
                                  --------
                                    14,850
- ------------------------------------------
 TOTAL U.S. GOVERNMENT AGENCIES
  (Cost $130,264)                 $126,553
- ------------------------------------------
</TABLE>
<TABLE>
<CAPTION>
           Description
- -------------------------------------------
  Shares/
 Principal               Maturity
  Amount   Rate            Date    Value
- -------------------------------------------
 <C>       <S>           <C>      <C>
 U.S. GOVERNMENT OBLIGATIONS--
 35.7%
 U.S. Treasury Bonds--14.5%
 $99,950     7.13%       2/15/23  $112,756
                                  --------
 U.S. Treasury Inflation Index
  Notes--4.3%
  33,555     3.68        1/15/08    33,594
                                  --------
 U.S. Treasury Notes--16.9%
  50,045     6.625       7/31/01    51,210
   8,060     7.50        2/15/05     8,731
  70,055     6.125       8/15/07    71,456
                                  --------
                                   131,397
- -------------------------------------------
 TOTAL U.S. GOVERNMENT OBLIGA-
  TIONS
  (Cost $286,667)                 $277,747
- -------------------------------------------
 PREFERRED STOCK--1.7%
  (Cost $15,000)
 Agency--1.7%
  15,000   Home Ownership
           Funding Corp.          $ 13,459
- -------------------------------------------
 FLOATING RATE BANK NOTES--3.2%
           Lloyds Bank PLC,
           Series 1
 $14,950     5.3125%     6/15/99  $ 12,820
           National Westminster
           Bank,
           Series C
  15,300     5.1875      8/31/99    12,385
- -------------------------------------------
 TOTAL FLOATING RATE BANK NOTES
  (Cost $25,971)                  $ 25,205
- -------------------------------------------
 SHORT-TERM INVESTMENT--4.0%
  (Cost $31,171)
           CDC Marches, Paris,
           France
 $23,771     4.88%        6/1/99  $ 31,171
- -------------------------------------------
 TOTAL INVESTMENTS--102.3%
  (Cost $825,228)(/1/)            $795,387
- -------------------------------------------
 Liabilities, less other as-
 sets--(2.3)%                      (17,890)
- -------------------------------------------
 NET ASSETS--100.0%               $777,497
</TABLE>
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
(/1/)At May 31, 1999, the Portfolio owned restricted securities valued at
 approximately $52,108 (6.7% of net assets), with an aggregate cost basis of
 $50,827. These securities may not be publicly sold without registration under
 the Securities Act of 1933. The value of these securities is determined by
 valuations supplied by pricing service brokers or, if not available, in
 accordance with procedures established by the Trustees.

See accompanying notes to financial statements.

                                       7
<PAGE>

Northern Institutional Funds
Fixed Income Portfolios
- --------------------------------------------------------------------------------
Statements of Investments
May 31, 1999
(All amounts in thousands)
(Unaudited)
<TABLE>
<CAPTION>
           Description
- -----------------------------------------------------
 Principal               Maturity
  Amount   Rate            Date    Value
- -----------------------------------------------------
                          Intermediate Bond Portfolio
 <C>       <S>           <C>      <C>
 ASSET-BACKED SECURITIES--8.1%
 Auto--4.3%
           Chevy Chase
           Automobile
           Receivables Trust,
           Series 1997-4, Class
           A
 $   287     6.25%        6/15/04 $   287
           Olympic Automobile
           Receivables Trust,
           Series 1996-D, Class
           A-4
     500     6.05         8/15/02     503
           Western Financial
           Owner Trust.,
           Series 1997-D, Class
           A-3
     471     6.25         3/20/02     472
           Series 1998-B, A-3
     750     5.95         7/20/02     750
                                  -------
                                    2,012
                                  -------
 Home Equity Loans--2.3%
           Advanta Mortgage
           Loan Trust, Interest
           Only Stripped
           Security, Series
           1998-1 Class AI0
      --     5.00        10/25/00     297
           Contimortgage Net
           Interest Margin
           Notes, Series 1998-
           A, Class A(/1/)
     189     7.92         3/16/28     184
           IMC Excess Cashflow
           Securities Trust,
           Series 1997-A, Class
           A(/1/)
     682     7.41        11/26/28     629
                                  -------
                                    1,110
                                  -------
 Utililies--1.5%
           California
           Infrastructure &
           Economic
           Development, Series
           1997-1, Class A-4
     690     6.22         3/25/04     691
- -----------------------------------------------------
 TOTAL ASSET-BACKED SECURITIES
  (Cost $4,709)                   $ 3,813
- -----------------------------------------------------
 COLLATERALIZED MORTGAGE OBLIGATIONS--
  16.4%
           Commercial Mortgage
           Asset Trust,
           Series 1999, Class
           A-2
 $   880     6.64%        4/17/13 $   862
           Credit Suisse First
           Boston Mortgage
           Securities Corp.,
           Series 1998-C2,
           Class A-1
   1,150     5.96        12/15/07   1,125
           Donaldson, Lufkin &
           Jenrette, Inc.
           Commercial Mortgage
           Corp.
   1,000     6.41         2/15/08     974
           Interest Only
           Stripped Securities
      --     1.63        11/21/21     684
           Morgan Stanley
           Capital I,
           Series 1998-WF1,
           Class A-2
     355     6.55        12/15/07     349
           Mortgage Capital
           Funding, Inc.,
           Series 1998-MC1,
           Class A-2
     540     6.66         1/18/08     538
           Nationslink Funding
           Corp.,
           Series 1999-1, Class
           A
   3,200     6.32        11/20/08   3,107
           Residential Asset
           Securitization
           Trust,
           Series 1997-A8,
           Class A-3
     100     7.00        10/25/27     100
- -----------------------------------------------------
 TOTAL COLLATERALIZED MORTGAGE
  OBLIGATIONS (Cost $7,995)       $ 7,739
- -----------------------------------------------------
</TABLE>
<TABLE>
<CAPTION>
           Description
- -----------------------------------------
 Principal               Maturity
  Amount   Rate            Date    Value
- -----------------------------------------
 <C>       <S>           <C>      <C>
 CORPORATE BONDS--22.0%
 Auto--4.5%
           Ford Motor Credit
           Co.
 $ 2,300     5.80%        1/12/09 $ 2,135
                                  -------
 Beverages--2.3%
           Coca-Cola (The) Co.
   1,100     6.70        10/15/36   1,113
                                  -------
 Diversified Financial Servic-
  es--2.1%
           CIT Group Holdings,
           Inc.
   1,000     5.85         5/26/00   1,000
                                  -------
 Environmental Control--1.0%
           Waste Management,
           Inc.
     440     7.10          8/1/26     449
                                  -------
 Insurance--1.5%
           Lumbermans' Mutual
           Casualty Co.(/1/)
     545     9.15          7/1/26     600
     105     8.45         12/1/37     104
                                  -------
                                      704
                                  -------
 Oil & Gas Producers--2.8%
           Conoco, Inc.
   1,350     5.90         4/15/04   1,323
                                  -------
 Special Purpose--2.1%
           Bunge Trade
           Ltd.(/1/)
   1,000     9.25          5/1/02     987
                                  -------
 Telephone--3.6%
           MCI WorldCom, Inc.
   1,575     7.75          4/1/07   1,673
                                  -------
 Transportation--2.1%
           Burlington Northern
           Santa Fe Corp.
   1,000     6.53         7/15/37     979
- -----------------------------------------
 TOTAL CORPORATE BONDS (Cost
  $10,803)                        $10,363
- -----------------------------------------
 U.S. GOVERNMENT AGENCIES--14.7%
 Fannie Mae REMIC Trusts--13.5%
           Pool #440700
 $ 1,326     6.00%        11/1/28 $ 1,261
           Pool#452421
   1,423     6.00         12/1/28   1,353
           Pool#456078
   3,938     6.00         12/1/28   3,745
                                  -------
                                    6,359
                                  -------
 Freddie Mac REMIC Trust--1.2%
           Pool#C18079
     609     6.00         11/1/28     580
- -----------------------------------------
 TOTAL U.S. GOVERNMENT AGENCIES
  (Cost $6,581)                   $ 6,939
- -----------------------------------------
 U.S. GOVERNMENT OBLIGATIONS--
  29.2%
 U.S. Treasury Inflation Indexed
  Notes--2.9%
 $ 1,350     3.625%       1/15/08 $ 1,352
 U.S. Treasury Notes--26.3%
  12,110     6.625        7/31/01  12,392
- -----------------------------------------
 TOTAL U.S. GOVERNMENT OBLIGA-
  TIONS
  (Cost $13,935)                  $13,744
- -----------------------------------------
</TABLE>

See accompanying notes to financial statements.

                                       8
<PAGE>

- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
           Description
- ------------------------------------------
 Principal               Maturity
  Amount   Rate            Date    Value
- ------------------------------------------
 <C>       <S>           <C>      <C>
 FLOATING RATE BANK NOTES--4.5%
           Lloyds Bank PLC,
           Series 1,
 $  750       5.3125%    6/15/99  $   643
           National Westminster
           Bank, Series C,
  1,850       5.1875     8/31/99    1,497
- ------------------------------------------
 TOTAL FLOATING RATE BANK NOTES
  (Cost $2,265)                   $ 2,140
- ------------------------------------------
 SHORT-TERM INVESTMENTS--18.7%
           CDC Marches, Paris,
           France
 $2,901       4.875%      6/1/99  $ 2,901
           Federal Home Loan
           Bank Discount Note
  5,924       4.68        6/1/99    5,924
- ------------------------------------------
 TOTAL SHORT-TERM INVESTMENTS
  (Cost $8,825)                   $ 8,825
- ------------------------------------------
 TOTAL INVESTMENTS--113.6%
  (Cost $55,113)                  $53,563
- ------------------------------------------
 Liabilities, less other as-
  sets--(13.6)%                    (6,442)
- ------------------------------------------
 NET ASSETS--100.0%               $47,121
- ------------------------------------------
- ------------------------------------------
</TABLE>

(/1/)At May 31, 1999, the Portfolio owned restricted securities valued at
 approximately $2,504 (5.3% of net assets), with an aggregate cost basis of
 $2,622. These securities may not be publicly sold without registration under
 the Securities Act of 1933. The value of these securities is determined by
 valuations supplied by pricing service brokers or, if not available, in
 accordance with procedures established by the Trustees.

See accompanying notes to financial statements.

                                       9
<PAGE>

Northern Institutional Funds
Fixed Income Portfolios
- --------------------------------------------------------------------------------
Statements of Investments
May 31, 1999
(All amounts in thousands)
(Unaudited)
<TABLE>
<CAPTION>
           Description
- ------------------------------------------------------
   Local
 Currency/
 Principal               Maturity
  Amount   Rate            Date    Value
- ------------------------------------------------------
                          International Bond Portfolio
 <C>       <S>           <C>      <C>
 DEBT OBLIGATIONS--96.4%
 Australian Dollar--2.6%
           Commonwealth of
           Australia
    980        10.00%    10/15/02 $   728
                                  -------
 British Pound Sterling--16.3%
           Abbey National PLC
    825         6.00      8/10/99   1,323
           BAA PLC
    525         7.875     2/10/07     935
           Lloyds Bank PLC
    800         7.375     3/11/04   1,358
           Treasury of Great
           Britain
    400         8.00       6/7/21     910
                                  -------
                                    4,526
                                  -------
 Canadian Dollar--2.8%
           Province of Ontario
  1,050         7.25      9/27/05     766
                                  -------
 Danish Krone--6.3%
           Kingdom of Denmark
 10,100         8.00      3/15/06   1,733
                                  -------
 Euro--42.8%
           Electricite de
           France
  1,214         3.75     10/28/03   1,281
           Federal Republic of
           Germany
    750         6.00      2/16/06     887
  1,650         4.00       7/4/09   1,711
    918         6.25       1/4/24   1,116
           Kingdom of Belgium
    453         7.50      7/29/08     586
           Kingdom of Spain
    721        11.30      1/15/02     909
    210        10.00      2/28/05     290
           Kingdom of the
           Netherlands
    318         5.75      2/15/07     371
           Republic of Austria
  1,670         8.00      1/30/02   1,003
           Republic of Finland
  1,920         5.50       2/9/01   1,069
           Republic of Italy
  2,066         8.50       4/1/04   2,635
                                  -------
                                   11,858
                                  -------
 Japanese Yen--15.0%
           Asian Development
           Bank
 90,000         5.00       2/5/03     870
           European Bank for
           Reconstruction
           and Development
 95,000         5.875    11/26/99     808
</TABLE>
<TABLE>
<CAPTION>
           Description
- -----------------------------------------
   Local
 Currency/
 Principal               Maturity
  Amount   Rate            Date    Value
- -----------------------------------------
 <C>       <S>           <C>      <C>
           International Bank
           for Reconstruction
           and Development
 100,000       4.50%     3/20/03  $   957
           Japan Development
           Bank
 160,000       6.50      9/20/01    1,516
                                  -------
                                    4,151
                                  -------
 Swedish Krona--1.9%
           Kingdom of Sweden
   3,700      10.25       5/5/03      532
                                  -------
 United States Dollar--8.7%
           U.S. Treasury Bond
   2,150       7.125     2/15/23    2,425
- -----------------------------------------
 TOTAL DEBT OBLIGATIONS (Cost
  $27,278)                        $26,719
- -----------------------------------------
 SHORT-TERM INVESTMENT--1.5%
  (Cost $431)
 United States Dollar
           CDC Marches, Paris,
           France
 $   431       4.875%     6/1/99  $   431
- -----------------------------------------
 TOTAL INVESTMENTS--97.9%
  (Cost $27,709)                  $27,150
- -----------------------------------------
 Other assets, less liabili-
  ties--2.1%                          571
- -----------------------------------------
 NET ASSETS--100.0%               $27,721
- -----------------------------------------
- -----------------------------------------
</TABLE>

See accompanying notes to financial statements.

                                       10
<PAGE>

- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
           Description
- --------------------------------------------------------
 Principal               Maturity
  Amount   Rate            Date    Value
- --------------------------------------------------------
                       Short-Intermediate Bond Portfolio
 <C>       <S>           <C>      <C>
 ASSET-BACKED SECURITIES--31.6%
 Airplane Leases--1.6%
           Pegasus Aviation
           Lease
           Securitization,
           Series 1999-1A,
           Class A1
 $ 2,927     6.30%        3/25/29 $  2,875
                                  --------
 Auto--8.0%
           Chevy Chase
           Automobile
           Receivables Trust,
           Series 1997-4, Class
           A
   2,433     6.25         6/15/04    2,441
           Olympic Automobile
           Receivables Trust,
           Series 1995-A, Class
           A
     579     7.875        7/15/01      579
           Series 1996-D, Class
           A-4
   4,075     6.05         8/15/02    4,093
           WFS Financial Owner
           Trust,
           Series 1997-A, Class
           A-3
   2,356     6.50         9/20/01    2,365
           Series 1997-D, Class
           A-3
   4,706     6.25         3/20/02    4,724
                                  --------
                                    14,202
                                  --------
 Credit Card--3.1%
           MBNA Master Credit
           Card Trust
           Series 1998-J, Class
           A
   5,800     5.25         2/15/06    5,564
                                  --------
 Home Equity Loans--11.8%
           Contimortgage Home
           Equity Loan Trust,
           Interest Only
           Stripped Security,
           Series 1998-1, Class
           A10I
      --     7.70         9/15/00    2,658
           Contimortgage Net
           Interest Margin
           Notes, Series 1998-
           A, Class A(/1/)
   2,346     7.92         3/16/28    2,284
           Delta Funding Home
           Equity Loan Trust,
           Interest Only
           Stripped Security,
           Series 1997-2, Class
           AIO
      --     8.29         6/25/27    1,299
           Green Tree Home
           Equity Loan Trust,
           Series 1998-C, Class
           A6
   5,800     6.29         7/15/29    5,764
           IMC Excess Cashflow
           Securities Trust,
           Series 1997-A, Class
           A(/1/)
   2,813     7.41        11/26/28    2,594
           Lehman FHA Title I
           Loan Trust,
           Series 1995-3, Class
           A
   5,432     8.00         5/25/16    5,558
           Interest Only
           Stripped Security,
           Series 1995-6, Class
           S
      --    10.24        11/25/16    1,012
                                  --------
                                    21,169
                                  --------
 Utilities--7.1%
           California
           Infrastructure
           Pacific Gas &
           Electric, Series
           1997-1, Class A-3
   7,250     6.15         6/25/02    7,274
</TABLE>
<TABLE>
<CAPTION>
           Description
- ------------------------------------------
 Principal               Maturity
  Amount   Rate            Date    Value
- ------------------------------------------
 <C>       <S>           <C>      <C>
           ComEd Transitional
           Funding Trust,
           Series 1998-1, Class
           A2
 $ 3,000     5.29%        6/25/03 $  2,976
           Southern Pacific
           Secured Asset Corp.,
           Interest Only
           Stripped Security,
           Series 1997-2, Class
           AIO
      --     1.78         6/25/00    2,455
                                  --------
                                    12,705
- ------------------------------------------
 TOTAL ASSET-BACKED SECURITIES
  (Cost $72,884)                    56,515
- ------------------------------------------
 COLLATERALIZED MORTGAGE OBLIGATIONS--
  19.1%
           AAMES Mortgage
           Trust, Interest Only
           Stripped Security,
           Series 1997-B, Class
           AIO
 $    --     8.40%        7/15/00 $    996
           BA Mortgage
           Securities, Inc.,
           Series 1998-4, Class
           1A5
   8,250     6.50         8/25/28    8,219
           Donaldson, Lufkin &
           Jenrette Mortgage
           Acceptance Corp.,
           Interest Only
           Stripped Security,
           Series 1997-CF2,
           Class CP
      --     7.08        11/15/04    5,206
           Series 1994-Q8,
           Class 2A1
   1,176     6.875        5/25/24    1,189
           GE Capital Mortgage
           Services, Inc.,
           Series 1994-15,
           Class A-6
   3,713     6.00         4/25/09    3,685
           Nationslink Funding
           Corp.,
           Series 1999-SL,
           Class A-3
   5,000     6.30        12/10/02    5,000
           PNC Mortgage
           Securities Corp.,
           Series 1996-PRI,
           ClassA(/1/)
   1,768     7.05         4/28/27    1,836
           Prudential Home
           Mortgage Securities
           Co., Series 1994-1,
           Class A-3
   5,580     6.00         2/25/09    5,559
           Residential Asset
           Securitization
           Trust,
           Series 1997-A8,
           Class A-3
   1,001     7.00        10/25/27    1,000
           Principal Only
           Stripped Security
           Series 1998-A1,
           Class A-6
   1,560    14.24         3/25/28    1,431
- ------------------------------------------
 TOTAL COLLATERALIZED MORTGAGE
  OBLIGATIONS (Cost $27,714)      34,121
- ------------------------------------------
 CORPORATE BONDS--13.3%
 Auto--2.2%
           Ford Motor Credit
           Co.,
 $ 4,000     5.75%        2/23/04 $  3,883
                                  --------
 Diversified Financial Servic-
  es--6.4%
           Associates Corp., NA
   5,000     5.85         1/15/01    4,990
           Donaldson, Lufkin &
           Jenrette, Inc.,
           Medium Term Note
   6,500     5.625        2/15/16    6,438
                                  --------
                                    11,428
                                  --------
 Oil & Gas Producers--1.5%
           Conoco, Inc.
   2,705     5.90         4/15/04    2,651
                                  --------
</TABLE>

See accompanying notes to financial statements.

                                       11
<PAGE>

Northern Institutional Funds
Fixed Income Portfolios
- --------------------------------------------------------------------------------
Statements of Investments
May 31, 1999
(All amounts in thousands)
(Unaudited)
<TABLE>
<CAPTION>
           Description
- --------------------------------------------------------------
 Principal               Maturity
  Amount   Rate            Date    Value
- --------------------------------------------------------------
                  Short-Intermediate Bond Portfolio--Continued
 <C>       <S>           <C>      <C>
 Special Purposes--1.0%
           Bunge Trade
           Ltd.,(/1/)
 $ 1,935     9.25%         5/1/02 $  1,910
                                  --------
 Telephone--2.2%
           MCI WorldCom, Inc.
   4,000     6.125        8/15/01    3,996
- --------------------------------------------------------------
 TOTAL CORPORATE BONDS (Cost
  $24,049)                        $ 23,868
- --------------------------------------------------------------
 U.S. GOVERNMENT AGENCY--0.1%
  (Cost $98)
           Fannie Mae REMIC
           Trust, Principal
           Only Stripped
           Security, Series
           1994-9, Class G
 $   118     5.63%       11/25/23 $    115
- --------------------------------------------------------------
 U.S. GOVERNMENT OBLIGATIONS--
  33.8%
 U.S. Treasury Inflation Indexed
  Notes--5.3%
 $ 9,500     3.625        1/15/08 $  9,511
 U.S. Treasury Notes--28.5%
  30,800     5.75%       10/31/02   30,915
  20,000     5.75         8/15/03   20,041
                                  --------
                                    50,956
- --------------------------------------------------------------
 TOTAL U.S. GOVERNMENT OBLIGA-
  TIONS
  (Cost $61,261)                  $ 60,467
- --------------------------------------------------------------
 SHORT-TERM INVESTMENT--0.3%
  (Cost $591)
           CDC Marches, Paris,
           France
<CAPTION>
 $  591      4.875%        6/1/99 $    591
- --------------------------------------------------------------
 <C>       <S>           <C>      <C>
 TOTAL INVESTMENTS--98.2%
  (Cost $186,597)                 $175,677
- --------------------------------------------------------------
 Other assets, less liabili-
  ties--1.8%                         3,302
- --------------------------------------------------------------
 NET ASSETS--100.0%               $178,979
- --------------------------------------------------------------
- --------------------------------------------------------------
</TABLE>
(/1/)At May 31, 1999, the Portfolio owned restricted securities valued at
 approximately $8,624 (4.8% of net assets), with an aggregate cost basis of
 $8,972. These securities may not be publicly sold without registration under
 the Securities Act of 1933. The value of these securities is determined by
 valuations supplied by pricing service or brokers or, if not available, in
 accordance with procedures established by the Trustees.

See accompanying notes to financial statements.

                                       12
<PAGE>

- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
           Description
- ----------------------------------------------------------
 Principal               Maturity
  Amount   Rate            Date    Value
- ----------------------------------------------------------
                      U.S. Government Securities Portfolio
 <C>       <S>           <C>      <C>
 U.S. GOVERNMENT AGENCIES--33.0%
 COLLATERALIZED MORTGAGE OBLIGATIONS--
  10.0%
 Fannie Mae REMIC Trust--6.8%
           Series 1998-M2,
           Class CPI,
           Interest Only
           Stripped Security
 $     --   28.50%        2/17/02 $   458
           Series 1997-M1,
           Class A
    2,309    6.78         1/17/03   2,334
           Series 1993-133,
           Class EZ
    2,285    5.85         2/25/17   2,281
           Series 1992-2000,
           Class E
      229    6.25         6/25/17     229
           Series 1997-20,
           Class IO,
           Interest Only
           Stripped Security
       --   20.20         3/25/27     361
                                  -------
                                    5,663
                                  -------
 Freddie Mac--3.2%
           Series 1296, Class H
      167   12.69         7/15/99     169
           Series 1520, Class F
      331    5.65         9/15/04     331
           Series 2080, Class
           PE
    2,250    6.00        11/15/21   2,213
                                  -------
                                    2,713
                                  -------
                                    8,376
                                  -------
 MORTGAGE-BACKED SECURITIES--12.7%
 Fannie Mae--8.1%
           Pool #124945
 $  1,674    6.98%         1/1/31 $ 1,727
           Pool #452421
    2,649    6.00         12/1/28   2,519
           Pool #452480
    2,541    6.00         11/1/28   2,541
                                  -------
                                    6,787
                                  -------
 Freddie Mac--4.6%
           Pool #410092
      179    7.12         11/1/24     185
           Pool #G00767
    1,685    7.50          8/1/27   1,721
           Pool #C18079
    2,071    6.00         11/1/28   1,971
                                  -------
                                    3,877
                                  -------
                                   10,664
                                  -------
</TABLE>
<TABLE>
<CAPTION>
           Description
- ------------------------------------------
 Principal               Maturity
  Amount   Rate            Date    Value
- ------------------------------------------
 <C>       <S>           <C>      <C>
 AGENCY OBLIGATIONS--10.3%
 Fannie Mae--5.9%
 $ 2,250     5.625%       3/15/03 $  2,249
   2,750     5.25         1/15/03    2,689
                                  --------
                                     4,938
                                  --------
 Freddie Mac--2.6%
   2,250     5.75         7/15/03    2,230
                                  --------
 Tennessee Valley Authority Note--1.8%
   1,500     6.24         7/15/45    1,517
                                  --------
                                     8,685
- ------------------------------------------
 TOTAL U.S. GOVERNMENT AGENCIES
  (Cost $28,270)                  $ 27,725
- ------------------------------------------
 U.S. GOVERNMENT OBLIGATIONS--53.4%
 U.S. Treasury Inflation Indexed
  Notes--3.2%
 $ 2,700     3.625%       1/15/08 $  2,703
 U.S. Treasury Notes--50.2%
  25,500     6.625        7/31/01   26,094
   2,250     6.25         1/31/02    2,288
   3,500     6.625        4/30/02    3,596
   8,000     5.75        10/31/02    8,030
   2,000     7.50         2/15/05    2,167
                                  --------
                                    42,175
                                  --------
- ------------------------------------------
 TOTAL U.S. GOVERNMENT OBLIGA-
  TIONS
  (Cost $45,551)                  $ 44,878
- ------------------------------------------
 SHORT-TERM INVESTMENT--12.5%
  (Cost $10,516)
           Federal Home Loan
           Bank Discount Note
 $10,516     4.68%         6/1/99 $ 10,516
- ------------------------------------------
 TOTAL INVESTMENTS--98.9%
  (Cost $84,337)                  $ 83,119
- ------------------------------------------
 Other assets, less liabili-
  ties--1.1%                           880
- ------------------------------------------
 NET ASSETS--100.0%               $ 83,999
- ------------------------------------------
</TABLE>

See accompanying notes to financial statements.

                                       13
<PAGE>

Northern Institutional Funds
Fixed Income Portfolios
- --------------------------------------------------------------------------------
Statements of Investments
May 31, 1999
(All amounts in thousands)
(Unaudited)
<TABLE>
<CAPTION>
           Description
- ------------------------------------------------------
 Principal               Maturity
  Amount   Rate            Date    Value
- ------------------------------------------------------
                         U.S. Treasury Index Portfolio
 <C>       <S>           <C>      <C>
 U.S. GOVERNMENT OBLIGATIONS--
  98.4%
 U.S. Treasury Notes--54.4%
 $1,450       4.50%       9/30/00 $ 1,435
  2,000       5.50       12/31/00   2,003
    650       4.875       3/31/01     644
  1,000       6.50        5/31/01   1,020
  1,000       6.625       3/31/02   1,027
  2,000       5.75        8/15/03   2,004
  1,720       6.50        8/15/05   1,783
  1,310       6.25        2/15/07   1,345
  1,280       4.75       11/15/08   1,191
                                  -------
                                   12,452
                                  -------
 U.S. Treasury Bonds--44.0%
  1,100       7.50       11/15/01   1,149
  2,040       6.00        7/31/02   2,063
    660      14.00       11/15/11     975
  1,450       7.25        5/15/16   1,622
  1,025       8.125       5/15/21   1,270
    700       8.00       11/15/21     859
    500       6.25        8/15/23     510
  1,530       6.50       11/15/26   1,619
                                  -------
                                   10,067
- ------------------------------------------------------
 TOTAL U.S. GOVERNMENT OBLIGA-
  TIONS
  (Cost $22,734)                  $22,519
- ------------------------------------------------------
 SHORT-TERM INVESTMENT--1.5%
  (Cost $338)
           Federal Home Loan
           Bank Discount Note
 $  338       4.68%        6/1/99 $   338
- ------------------------------------------------------
 TOTAL INVESTMENTS--99.9%
  (Cost $23,072)                  $22,857
- ------------------------------------------------------
 Other assets, less liabili-
  ties--0.1%                           37
- ------------------------------------------------------
 NET ASSETS--100.0%               $22,894
- ------------------------------------------------------
- ------------------------------------------------------
</TABLE>

See accompanying notes to financial statements.

                                       14
<PAGE>

Northern Institutional Funds
Fixed Income Portfolios
- --------------------------------------------------------------------------------
Statements of Assets and Liabilities
May 31, 1999
(All amounts in thousands, except net asset value per share)
(Unaudited)
<TABLE>
<CAPTION>
                                                                  Short-       U.S.      U.S.
                                    Intermediate International Intermediate Government Treasury
                           Bond         Bond         Bond          Bond     Securities   Index
                         Portfolio   Portfolio     Portfolio    Portfolio   Portfolio  Portfolio
- ------------------------------------------------------------------------------------------------
<S>                      <C>        <C>          <C>           <C>          <C>        <C>
Assets:
Investments in securi-
ties, at cost            $825,228     $55,113       $27,709      $186,597    $84,337    $23,072
- ------------------------------------------------------------------------------------------------
Investments in securi-
ties, at value           $795,387     $53,563       $27,150      $175,677    $83,119    $22,857
Cash and foreign cur-
rencies                        --          --             2            --         28         --
Receivables:
 Interest                  10,553         632           572         2,169      1,041        262
 Investment securities
  sold                      3,217       4,305            --         1,184         --        451
 Fund shares sold              97          --            --           143          3          1
 Administrator                 22           6             7             9          5          6
 Foreign tax reclaims          --          --            17            --         --         --
Other assets                   25          16             7             6          3          4
- ------------------------------------------------------------------------------------------------
Total assets              809,301      58,522        27,755       179,188     84,199     23,581
- ------------------------------------------------------------------------------------------------
Liabilities:
Overdraft                  21,177       1,094            --            65         --         27
Payable for:
 Investment securities
  purchased                 9,435          --            --            --         --        632
 Fund shares redeemed         753      10,269            --            56        163         12
Accrued expenses:
 Advisory fees                165          18            17            39         17          3
 Shareholder service
  fees                        134          --            --             1          1          1
 Administration fees           66           7             4            16          7          2
 Transfer agent fees           12           1            --             2          1         --
 Custodian fees                12          --             5             4          4          2
Other liabilities              50          12             8            26          7          8
- ------------------------------------------------------------------------------------------------
Total liabilities          31,804      11,401            34           209        200        687
- ------------------------------------------------------------------------------------------------
Net assets               $777,497     $47,121       $27,721      $178,979    $83,999    $22,894
- ------------------------------------------------------------------------------------------------
Analysis of net assets:
Paid-in capital          $800,659     $49,879       $28,429      $188,442    $85,239    $22,987
Undistributed net in-
 vestment income            2,013         104            76         1,414         96         30
Accumulated net
 realized gains
 (losses) on
 investments, forward
 foreign currency
 contracts and foreign
 currency transactions      4,666      (1,312)         (210)           43       (118)        92
Net unrealized
 depreciation on
 investments, forward
 foreign currency
 contracts and foreign
 currency transactions    (29,841)     (1,550)         (559)      (10,920)    (1,218)      (215)
Net unrealized loss on
 translation of other
 assets and liabilities
 denominated in foreign
 currencies                    --          --           (15)           --         --         --
- ------------------------------------------------------------------------------------------------
Net assets               $777,497     $47,121       $27,721      $178,979    $83,999    $22,894
- ------------------------------------------------------------------------------------------------
Total shares outstand-
ing (no par value), un-
limited shares autho-
rized
 Class A                   35,753       2,424         1,412         9,257      4,235      1,074
 Class C                    3,036          --            --            --         --          7
 Class D                       81           2             1            13         41         24
- ------------------------------------------------------------------------------------------------
Net asset value, offer-
ing and redemption
price per share
 Class A                 $  20.00     $ 19.43       $ 19.62      $  19.31    $ 19.64    $ 20.72
 Class C                 $  20.00          --            --            --         --    $ 20.72
 Class D                 $  19.97     $ 19.41       $ 19.56      $  19.26    $ 19.60    $ 20.69
- ------------------------------------------------------------------------------------------------
</TABLE>

See accompanying notes to financial statements.

                                       15
<PAGE>

Northern Institutional Funds
Fixed Income Portfolios
- --------------------------------------------------------------------------------
Statements of Operations
For the Six Months Ended May 31, 1999
(All amounts in thousands)
(Unaudited)
<TABLE>
<CAPTION>
                                                                  Short-       U.S.      U.S.
                                    Intermediate International Intermediate Government Treasury
                            Bond        Bond         Bond          Bond     Securities   Index
                          Portfolio  Portfolio     Portfolio    Portfolio   Portfolio  Portfolio
- ------------------------------------------------------------------------------------------------
<S>                       <C>       <C>          <C>           <C>          <C>        <C>
Interest income            $25,558     $2,326        $  854(a)    $8,735      $2,037    $  655
- ------------------------------------------------------------------------------------------------
Expenses:
Investment advisory fees     2,172        249           129          539         221        48
Administration fees            362         41            21           90          37        12
Transfer agent fees             66          4             1            9           5         2
Registration fees               64          8            11           19          10         9
Shareholder servicing
 fees                           49         --            --            1           2         1
Custodian fees                  41          9            29           20          11        11
Professional fees               24          3             3            7           3         3
Trustee fees and ex-
 penses                         11          2             2            3           2         2
Amortization of deferred
 organization costs             --         --             5           --          --        --
Other                           23          7             8            8           4         4
- ------------------------------------------------------------------------------------------------
Total expenses               2,812        323           209          696         295        92
Less voluntary waivers
 of investment advisory
 fees                       (1,267)      (145)          (29)        (315)       (129)      (30)
Less expenses reimburs-
 able by Administrator        (164)       (29)          (42)         (57)        (30)      (29)
- ------------------------------------------------------------------------------------------------
Net expenses                 1,381        149           138          324         136        33
- ------------------------------------------------------------------------------------------------
Net investment income       24,177      2,177           716        8,411       1,901       622
Net realized gains
 (losses) on:
 Investment transactions     4,546     (1,312)          (50)         (21)        (82)      415
 Foreign currency trans-
  actions                       --         --          (173)          --          --        --
Net change in unrealized
 depreciation on invest-
 ments, forward foreign
 currency contracts and
 foreign currency
 transactions              (38,678)    (1,404)       (1,705)      (4,899)     (1,293)   (1,599)
Net change in unrealized
 losses on translation
 of other assets and li-
 abilities denominated
 in foreign currencies          --         --           (30)          --          --        --
- ------------------------------------------------------------------------------------------------
Net increase (decrease)
 in net assets resulting
 from operations           $(9,955)     $(539)      $(1,242)      $3,491        $526     $(562)
- ------------------------------------------------------------------------------------------------
</TABLE>

(a) Net of $3 in non-reclaimable foreign withholding taxes.

See accompanying notes to financial statements.

                                       16
<PAGE>




                      [THIS PAGE INTENTIONALLY LEFT BLANK]




                                       17
<PAGE>

Northern Institutional Funds
Fixed Income Portfolios
- --------------------------------------------------------------------------------
Statements of Changes in Net Assets
For the Six Months Ended May 31, 1999 (Unaudited) and the Year Ended November
30,
(All amounts in thousands)
<TABLE>
<CAPTION>
                                                              Intermediate
                                               Bond               Bond
                                             Portfolio          Portfolio
                                         ------------------  ----------------
                                           1999      1998     1999     1998
- ------------------------------------------------------------------------------
<S>                                      <C>       <C>       <C>      <C>
Increase (decrease) in net assets from
 operations:
 Net investment income                   $ 24,177  $ 41,026  $ 2,177  $ 1,373
 Net realized gains (losses) on
  investments, forward foreign currency
  contracts and foreign currency
  transactions                              4,546    21,659   (1,312)     324
 Net change in unrealized appreciation
  (depreciation) on investments, forward
  foreign currency contracts and foreign
  currency transactions                   (38,678)   (6,108)  (1,404)     (85)
 Net change in unrealized gains (losses)
  on translations of other assets and
  liabilities denominated in foreign
  currencies                                   --        --       --       --
- ------------------------------------------------------------------------------
Net increase (decrease) in net assets
resulting from operations                  (9,955)   56,577     (539)   1,612
- ------------------------------------------------------------------------------
Distributions to Class A shareholders:
 Net investment income                    (21,440)  (35,543)  (2,105)  (1,358)
 Net realized gain                        (19,315)   (2,645)    (303)      --
- ------------------------------------------------------------------------------
Total distributions to Class A
shareholders                              (40,755)  (38,188)  (2,408)  (1,358)
- ------------------------------------------------------------------------------
Distributions to Class C shareholders:
 Net investment income                     (1,929)   (3,794)      --       --
 Net realized gain                         (1,966)     (295)      --       --
- ------------------------------------------------------------------------------
Total distributions to Class C
shareholders                               (3,895)   (4,089)      --       --
- ------------------------------------------------------------------------------
Distributions to Class D shareholders:
 Net investment income                        (54)     (107)      (1)      (1)
 Net realized gain                            (63)       (6)      --       --
- ------------------------------------------------------------------------------
Total distributions to Class D
shareholders                                 (117)     (113)      (1)      (1)
- ------------------------------------------------------------------------------
Class A share transactions:
 Proceeds from the sale of shares         160,531   217,204   71,450   27,967
 Reinvested distributions                  35,251    32,297    1,154    1,346
 Cost of shares redeemed                  (36,297) (117,228) (53,016) (11,125)
- ------------------------------------------------------------------------------
Net increase (decrease) in net assets
resulting from
 Class A share transactions               159,485   132,273   19,588   18,188
- ------------------------------------------------------------------------------
Class C share transactions:
 Proceeds from the sale of shares          11,082    30,139       --       --
 Reinvested distributions                   3,895     4,089       --       --
 Cost of shares redeemed                  (10,976)  (24,755)      --       --
- ------------------------------------------------------------------------------
Net increase (decrease) in net assets
resulting from Class C share
transactions                                4,001     9,473       --       --
- ------------------------------------------------------------------------------
Class D share transactions:
 Proceeds from the sale of shares             122     2,529       --       41
 Reinvested distributions                     116       113        1        1
 Cost of shares redeemed                     (511)   (1,238)      --       --
- ------------------------------------------------------------------------------
Net increase (decrease) in net assets
resulting from Class D share
transactions                                 (273)    1,404        1       42
- ------------------------------------------------------------------------------
Net increase (decrease)                   108,491   157,337   16,641   18,483
Net assets--beginning of period           669,006   511,669   30,480   11,997
- ------------------------------------------------------------------------------
Net assets--end of period                $777,497  $669,006  $47,121  $30,480
- ------------------------------------------------------------------------------
Undistributed net investment income      $  2,013  $  1,259  $   104  $    33
- ------------------------------------------------------------------------------
</TABLE>


See accompanying notes to financial statements.

                                       18
<PAGE>



- --------------------------------------------------------------------------------




<TABLE>
<CAPTION>
                       Short-         U.S. Government
 International      Intermediate        Securities       U.S. Treasury
Bond Portfolio     Bond Portfolio        Portfolio      Index Portfolio
- ----------------  ------------------  ----------------  -----------------
 1999     1998      1999      1998     1999     1998     1999      1998
- --------------------------------------------------------------------------
<S>      <C>      <C>       <C>       <C>      <C>      <C>      <C>

$   716  $ 1,396  $  8,411  $ 19,141  $ 1,901  $ 2,954  $   622  $  1,443


   (223)     220       (21)    1,538      (82)     786      415       732


 (1,705)   1,365    (4,899)   (6,078)  (1,293)    (228)  (1,599)      445


    (30)      17        --        --       --       --       --        --
- --------------------------------------------------------------------------
 (1,242)   2,998     3,491    14,601      526    3,512     (562)    2,620
- --------------------------------------------------------------------------


   (992)  (1,024)   (7,680)  (17,379)  (1,807)  (2,583)    (591)   (1,370)
   (183)    (385)   (2,451)     (267)    (683)      --       --        --
- --------------------------------------------------------------------------
 (1,175)  (1,409)  (10,131)  (17,646)  (2,490)  (2,583)    (591)   (1,370)
- --------------------------------------------------------------------------


     --       --        --        --      (15)    (188)      (4)       (1)
     --       --        --        --      (56)      --       --        --
- --------------------------------------------------------------------------
     --       --        --        --      (71)    (188)      (4)       (1)
- --------------------------------------------------------------------------


     (2)      (5)      (19)      (87)     (20)     (42)     (20)     (105)
     (1)      (2)      (10)       (1)     (16)      --       --        --
- --------------------------------------------------------------------------
     (3)      (7)      (29)      (88)     (36)     (42)     (20)     (105)
- --------------------------------------------------------------------------


    825    2,261    48,448   125,815   38,217   12,721    8,651    15,301
    983    1,217     8,363    14,872    2,387    2,336      294       458
   (238)  (2,867)  (54,427) (156,030)  (3,705) (10,457)  (7,651)  (28,575)
- --------------------------------------------------------------------------


  1,570      611     2,384   (15,343)  36,899    4,600    1,294   (12,816)
- --------------------------------------------------------------------------


     --       --        --        --       24    1,687      255       184
     --       --        --        --       70      188        4         1
     --       --        --        --   (4,023)  (1,094)    (128)     (164)
- --------------------------------------------------------------------------
     --       --        --        --   (3,929)     781      131        21
- --------------------------------------------------------------------------


      5       65        66       454      163    1,026      158       445
      3        6        29        75       37       29       17        53
   (137)     (38)     (654)     (578)    (583)    (155)  (1,352)     (570)
- --------------------------------------------------------------------------
   (129)      33      (559)      (49)    (383)     900   (1,177)      (72)
- --------------------------------------------------------------------------
   (979)   2,226    (4,844)  (18,525)  30,516    6,980     (929)  (11,723)
 28,700   26,474   183,823   202,348   53,483   46,503   23,823    35,546
- --------------------------------------------------------------------------
$27,721  $28,700  $178,979  $183,823  $83,999  $53,483  $22,894  $ 23,823
- --------------------------------------------------------------------------
$    76  $   354  $  1,414  $    702  $    96  $    37  $    30  $     23
- --------------------------------------------------------------------------
</TABLE>

                                       19
<PAGE>

Northern Institutional Funds
Fixed Income Portfolios
- -------------------------------------------------------------------------------
Financial Highlights
For the Six Months Ended May 31, 1999 (Unaudited) and the Years Ended November
30,
Bond Portfolio
<TABLE>
<CAPTION>
                                                 Class A
                          -----------------------------------------------------------
                            1999       1998      1997      1996      1995      1994
- ---------------------------------------------------------------------------------------
<S>                       <C>        <C>       <C>       <C>       <C>       <C>
Net asset value, begin-
 ning of period           $  21.61   $  21.08  $  20.77  $  20.96  $  18.29  $  20.70
Income from investment
 operations:
 Net investment income        0.67       1.47      1.34      1.29      1.17      1.42
 Net realized and
  unrealized gain (loss)     (0.94)      0.62      0.29     (0.19)     2.66     (2.21)
- ---------------------------------------------------------------------------------------
Total income (loss) from
 investment operations       (0.27)      2.09      1.63      1.10      3.83     (0.79)
- ---------------------------------------------------------------------------------------
Distributions to share-
 holders:
 Net investment income       (0.66)     (1.44)    (1.32)    (1.26)    (1.14)    (1.46)
 Net realized gain           (0.68)     (0.12)      --        --        --      (0.15)
 Return of capital             --         --        --      (0.03)    (0.02)    (0.01)
- ---------------------------------------------------------------------------------------
Total distributions to
 shareholders                (1.34)     (1.56)    (1.32)    (1.29)    (1.16)    (1.62)
- ---------------------------------------------------------------------------------------
Net increase (decrease)      (1.61)      0.53      0.31     (0.19)     2.67     (2.41)
- ---------------------------------------------------------------------------------------
Net asset value, end of
 period                   $  20.00   $  21.61  $  21.08  $  20.77  $  20.96  $  18.29
- ---------------------------------------------------------------------------------------
Total return (a)             (1.34)%    10.31%     8.17%     5.57%    21.55%    (4.04)%
Ratio to average net as-
 sets of (b):
 Expenses, net of waiv-
  ers and reimbursements      0.36%      0.36%     0.36%     0.36%     0.36%     0.36%
 Expenses, before waiv-
  ers and reimbursements      0.76%      0.75%     0.77%     0.84%     0.84%     0.87%
 Net investment income,
  net of waivers and re-
  imbursements                6.70%      7.07%     6.66%     6.39%     5.94%     7.31%
 Net investment income,
  before waivers and re-
  imbursements                6.30%      6.68%     6.25%     5.91%     5.46%     6.80%
Portfolio turnover rate      40.98%     84.80%    76.30%   101.38%    74.19%   103.09%
Net assets at end of pe-
 riod (in thousands)      $715,176   $605,517  $460,514  $366,850  $286,301  $257,391
- ---------------------------------------------------------------------------------------
</TABLE>

<TABLE>
<CAPTION>
                                          Class C                                        Class D
                          -------------------------------------------  -------------------------------------------------
                           1999     1998     1997     1996    1995(c)   1999     1998    1997    1996     1995   1994(d)
- -------------------------------------------------------------------------------------------------------------------------
<S>                       <C>      <C>      <C>      <C>      <C>      <C>      <C>     <C>     <C>      <C>     <C>
Net asset value, begin-
 ning of period           $ 21.60  $ 21.07  $ 20.78  $ 20.96  $20.21   $21.58   $21.05  $20.76  $ 20.94  $18.29  $18.74
Income from investment
 operations:
 Net investment income       0.67     1.42     1.29     1.25    0.47     0.66     1.38    1.24     1.22    1.08    0.28
 Net realized and
  unrealized gain (loss)    (0.95)    0.62     0.28    (0.18)   0.74    (0.97)    0.63    0.30    (0.18)   2.66   (0.45)
- -------------------------------------------------------------------------------------------------------------------------
Total income from in-
 vestment operations        (0.28)    2.04     1.57     1.07    1.21    (0.31)    2.01    1.54     1.04    3.74   (0.17)
- -------------------------------------------------------------------------------------------------------------------------
Distributions to share-
 holders:
 Net investment income      (0.64)   (1.39)   (1.28)   (1.22)  (0.45)   (0.62)   (1.36)  (1.25)   (1.19)  (1.09)  (0.28)
 Net realized gain          (0.68)   (0.12)     --       --      --     (0.68)   (0.12)    --       --      --       --
 Return of capital            --       --       --     (0.03)  (0.01)     --       --      --     (0.03)    --       --
- -------------------------------------------------------------------------------------------------------------------------
Total distributions to
 shareholders               (1.32)   (1.51)   (1.28)   (1.25)  (0.46)   (1.30)   (1.48)  (1.25)   (1.22)  (1.09)  (0.28)
- -------------------------------------------------------------------------------------------------------------------------
Net increase (decrease)     (1.60)    0.53     0.29    (0.18)   0.75    (1.61)    0.53    0.29    (0.18)   2.65   (0.45)
- -------------------------------------------------------------------------------------------------------------------------
Net asset value, end of
 period                   $ 20.00  $ 21.60  $ 21.07  $ 20.78  $20.96   $19.97   $21.58  $21.05  $ 20.76  $20.94  $18.29
- -------------------------------------------------------------------------------------------------------------------------
Total return (a)           (1.46)%   10.04%    7.88%    5.33%   6.08%   (1.53)%   9.89%   7.74%    5.17%  21.06%  (0.94)%
Ratio to average net as-
 sets of (b):
 Expenses, net of
  waivers and
  reimbursements             0.60%    0.60%    0.60%    0.60%   0.60%    0.75%    0.75%   0.75%    0.75%   0.75%   0.75%
 Expenses, before
  waivers and
  reimbursements             1.00%    0.99%    1.01%    1.08%   1.08%    1.15%    1.14%   1.16%    1.23%   1.23%   1.26%
 Net investment income,
  net of waivers and
  reimbursements             6.46%    6.83%    6.39%    6.09%   5.59%    6.31%    6.70%   6.27%    5.99%   5.48%   6.31%
 Net investment income,
  before waivers and
  reimbursements             6.06%    6.44%    5.98%    5.61%   5.11%    5.91%    6.31%   5.86%    5.51%   5.00%   5.80%
Portfolio turnover rate     40.98%   84.80%   76.30%  101.38%  74.19%   40.98%   84.80%  76.30%  101.38%  74.19% 103.09%
Net assets at end of
 period (in thousands)    $60,696  $61,450  $50,554  $ 7,342  $3,704   $1,625   $2,039  $  601  $   220  $  120  $   15
- -------------------------------------------------------------------------------------------------------------------------
</TABLE>

(a) Assumes investment at net asset value at the beginning of the period,
    reinvestment of all dividends and distributions, and a complete redemption
    of the investment at the net asset value at the end of the period. Total
    return is not annualized for periods less than one year.
(b) Annualized for periods less than a full year.
(c) For the period July 3, 1995 (Class C shares issue date) through November
    30, 1995.
(d) For the period September 14, 1994 (Class D shares issue date) through
    November 30, 1994.

See accompanying notes to financial statements.

                                      20
<PAGE>

Northern Institutional Funds
Fixed Income Portfolios
- -------------------------------------------------------------------------------
Financial Highlights
For the Six Months Ended May 31, 1999 (Unaudited) and the Years Ended November
30,
Intermediate Bond Portfolio
<TABLE>
<CAPTION>
                                                         Class A
                                                 ----------------------------
                                                  1999      1998     1997 (a)
- -----------------------------------------------------------------------------
<S>                                              <C>       <C>       <C>
Net asset value, beginning of period             $ 20.15   $ 19.89   $ 20.00
Income (loss) from investment operations:
 Net investment income                              0.52      1.19      0.38
 Net realized and unrealized gain (loss)           (0.62)     0.27     (0.15)
- -----------------------------------------------------------------------------
Total income (loss) from investment operations     (0.10)     1.46      0.23
- -----------------------------------------------------------------------------
Distributions to shareholders:
 Net investment income                             (0.50)    (1.20)    (0.34)
 Net realized gain                                 (0.12)       --        --
- -----------------------------------------------------------------------------
Total distributions to shareholders                (0.62)    (1.20)    (0.34)
- -----------------------------------------------------------------------------
Net increase (decrease)                            (0.72)     0.26     (0.11)
- -----------------------------------------------------------------------------
Net asset value, end of period                   $ 19.43   $ 20.15   $ 19.89
- -----------------------------------------------------------------------------
Total return (b)                                   (0.59)%    7.55%     1.17%
Ratio to average net assets of (c):
 Expenses, net of waivers and reimbursements        0.36%     0.36%     0.36%
 Expenses, before waivers and reimbursements        0.78%     1.09%     2.28%
 Net investment income, net of waivers and reim-
  bursements                                        5.25%     6.19%     5.87%
 Net investment income, before waivers and reim-
  bursements                                        4.83%     5.46%     3.95%
Portfolio turnover rate                           127.74%    93.40%    56.99%
Net assets at end of period (in thousands)       $47,080   $30,439   $11,997
- -----------------------------------------------------------------------------
</TABLE>

<TABLE>
<CAPTION>
                                                              Class D
                                                          -----------------
                                                           1999    1998 (d)
- ----------------------------------------------------------------------------
<S>                                                       <C>      <C>
Net asset value, beginning of period                      $20.13    $20.46
Income (loss) from investment operations:
 Net investment income                                      0.49      0.18
 Net realized and unrealized loss                          (0.63)    (0.32)
- ----------------------------------------------------------------------------
Total loss from investment operations                      (0.14)    (0.14)
- ----------------------------------------------------------------------------
Distributions to shareholders:
 Net investment income                                     (0.46)    (0.19)
 Net realized gain                                         (0.12)       --
- ----------------------------------------------------------------------------
Total distributions to shareholders                        (0.58)    (0.19)
- ----------------------------------------------------------------------------
Net decrease                                               (0.72)    (0.33)
- ----------------------------------------------------------------------------
Net asset value, end of period                            $19.41    $20.13
- ----------------------------------------------------------------------------
Total return (b)                                           (0.79)%   (0.70)%
Ratio to average net assets of (c):
 Expenses, net of waivers and reimbursements                0.75%     0.75%
 Expenses, before waivers and reimbursements                1.17%     1.48%
 Net investment income, net of waivers and reimbursements   4.86%     5.69%
 Net investment income, before waivers and reimbursements   4.44%     4.96%
Portfolio turnover rate                                   127.74%    93.40%
Net assets at end of period (in thousands)                $   41    $   41
- ----------------------------------------------------------------------------
</TABLE>
(a) For the period August 1, 1997 (commencement of operations) through
    November 30, 1997.
(b) Assumes investment at net asset value at the beginning of the period,
    reinvestment of all dividends and distributions, and a complete redemption
    of the investment at the net asset value at the end of the period. Total
    return is not annualized for periods less than one year.
(c) Annualized for periods less than a full year.
(d) For the period October 5, 1998 (Class D share issue date) through November
    30, 1998.

See accompanying notes to financial statements.

                                      21
<PAGE>

Northern Institutional Funds
Fixed Income Portfolios
- -------------------------------------------------------------------------------
Financial Highlights
For the Six Months Ended May 31, 1999 (Unaudited) and the Years Ended November
30,
International Bond Portfolio
<TABLE>
<CAPTION>
                                              Class A
                          -------------------------------------------------------
                           1999      1998     1997      1996     1995    1994 (a)
- ---------------------------------------------------------------------------------
<S>                       <C>       <C>      <C>       <C>      <C>      <C>
Net asset value, begin-
 ning of period           $ 21.35   $ 20.13  $ 22.16   $ 21.74  $ 19.93  $ 20.00
Income (Loss) from in-
 vestment operations:
 Net investment income       1.02      0.98     1.02      1.54     1.26     0.79
 Net realized and
  unrealized gain (loss)    (1.88)     1.33    (1.70)     0.43     2.28     0.01
- ---------------------------------------------------------------------------------
Total income (loss) from
 investment operations      (0.86)     2.31    (0.68)     1.97     3.54     0.80
- ---------------------------------------------------------------------------------
Distributions to share-
 holders:
 Net investment income
  (b)                       (0.73)    (0.79)   (1.01)    (1.55)   (1.73)   (0.87)
 Net realized gain          (0.14)    (0.30)   (0.34)      --       --       --
- ---------------------------------------------------------------------------------
Total distributions to
 shareholders               (0.87)    (1.09)   (1.35)    (1.55)   (1.73)   (0.87)
- ---------------------------------------------------------------------------------
Net increase (decrease)     (1.73)     1.22    (2.03)     0.42     1.81    (0.07)
- ---------------------------------------------------------------------------------
Net asset value, end of
 period                   $ 19.62   $ 21.35  $ 20.13   $ 22.16  $ 21.74  $ 19.93
- ---------------------------------------------------------------------------------
Total return (c)            (4.53)%   11.85%   (3.02)%    9.47%   18.20%    4.03%
Ratio to average net as-
 sets of (d):
 Expenses, net of waiv-
  ers and reimbursements     0.96%     0.96%    0.96%     0.96%    0.96%    0.96%
 Expenses, before waiv-
  ers and reimbursements     1.46%     1.52%    1.52%     1.58%    1.47%    1.49%
 Net investment income,
  net of waivers and re-
  imbursements               5.00%     5.27%    5.61%     5.91%    5.92%    5.93%
 Net investment income,
  before waivers and re-
  imbursements               4.50%     4.71%    5.05%     5.29%    5.41%    5.40%
Portfolio turnover rate      6.67%    23.76%   29.29%    33.89%   54.46%   88.65%
Net assets at end of pe-
 riod (in thousands)      $27,720   $28,568  $26,383   $34,183  $32,673  $26,947
- ---------------------------------------------------------------------------------
</TABLE>

<TABLE>
<CAPTION>
                                                  Class D
                                   -------------------------------------------
                                   1999 (e)   1998    1997     1996   1995 (f)
- -------------------------------------------------------------------------------
<S>                                <C>       <C>     <C>      <C>     <C>
Net asset value, beginning of pe-
 riod                               $21.26   $20.06  $22.14   $21.74   $22.17
Income (Loss) from investment op-
 erations:
 Net investment income                0.38     0.93    0.97     1.37     0.02
 Net realized and unrealized gain
  (loss)                             (1.40)    1.29   (1.72)    0.51    (0.08)
- -------------------------------------------------------------------------------
Total income (loss) from invest-
 ment operations                     (1.02)    2.22   (0.75)    1.88    (0.06)
- -------------------------------------------------------------------------------
Distributions to shareholders:
 Net investment income (b)           (0.54)   (0.72)  (0.99)   (1.48)   (0.37)
 Net realized gain                   (0.14)   (0.30)  (0.34)     --       --
- -------------------------------------------------------------------------------
Total distributions to sharehold-
 ers                                 (0.68)   (1.02)  (1.33)   (1.48)   (0.37)
- -------------------------------------------------------------------------------
Net increase (decrease)              (1.70)    1.20   (2.08)    0.40    (0.43)
- -------------------------------------------------------------------------------
Net asset value, end of period      $19.56   $21.26  $20.06   $22.14   $21.74
- -------------------------------------------------------------------------------
Total return (c)                     (5.00)%  11.43%  (3.38)%   9.04%   (0.30)%
Ratio to average net assets of
 (d):
 Expenses, net of waivers and re-
  imbursements                        1.35%    1.35%   1.35%    1.35%    1.35%
 Expenses, before waivers and re-
  imbursements                        1.85%    1.91%   1.91%    1.97%    1.86%
 Net investment income, net of
  waivers and reimbursements          4.61%    4.90%   5.36%    5.67%    3.26%
 Net investment income, before
  waivers and reimbursements          4.11%    4.34%   4.80%    5.05%    2.75%
Portfolio turnover rate               6.67%   23.76%  29.29%   33.89%   54.46%
Net assets at end of period (in
 thousands)                         $    1   $  132  $   91   $   52   $    9
- -------------------------------------------------------------------------------
</TABLE>

(a) For the period March 28, 1994 (commencement of operations) through
    November 30, 1994.
(b) Distributions to shareholders from net investment income include amounts
    relating to foreign currency transactions which are treated as ordinary
    income for federal income tax purposes.
(c) Assumes investment at net asset value at the beginning of the period,
    reinvestment of all dividends and distributions, and a complete redemption
    of the investment at the net asset value at the end of the period. Total
    return is not annualized for periods less than one year.
(d) Annualized for periods less than a full year.
(e) Financial highlights for the six months ended May 31, 1999 were calculated
    using average shares outstanding for the period.
(f) For the period November 20, 1995 (Class D shares issue date) through
    November 30, 1995.

See accompanying notes to financial statements.

                                      22
<PAGE>

Northern Institutional Funds
Fixed Income Portfolios
- -------------------------------------------------------------------------------
Financial Highlights
For the Six Months Ended May 31, 1999 (Unaudited) and the Years Ended November
30,
Short-Intermediate Bond Portfolio
<TABLE>
<CAPTION>
                                                Class A
                          ---------------------------------------------------------
                            1999      1998      1997      1996      1995     1994
- ------------------------------------------------------------------------------------
<S>                       <C>       <C>       <C>       <C>       <C>       <C>
Net asset value, begin-
 ning of period           $  20.03  $  20.36  $  20.70  $  20.73  $  19.53  $ 20.33
Income (loss) from in-
 vestment operations:
 Net investment income        0.91      1.84      1.46      1.14      1.02     0.97
 Net realized and
  unrealized gain (loss)     (0.52)    (0.36)    (0.29)    (0.01)     1.19    (0.80)
- ------------------------------------------------------------------------------------
Total income from in-
 vestment operations          0.39      1.48      1.17      1.13      2.21     0.17
- ------------------------------------------------------------------------------------
Distributions to share-
holders:
 Net investment income       (0.84)    (1.78)    (1.46)    (1.16)    (1.01)   (0.97)
 Net realized gain           (0.27)    (0.03)    (0.05)      --        --       --
- ------------------------------------------------------------------------------------
Total distributions to
 shareholders                (1.11)    (1.81)    (1.51)    (1.16)    (1.01)   (0.97)
- ------------------------------------------------------------------------------------
Net increase (decrease)      (0.72)    (0.33)    (0.34)    (0.03)     1.20    (0.80)
- ------------------------------------------------------------------------------------
Net asset value, end of
 period                   $  19.31  $  20.03  $  20.36  $  20.70  $  20.73  $ 19.53
- ------------------------------------------------------------------------------------
Total return (a)              1.88%     7.50%     5.95%     5.68%    11.58%    0.84%
Ratio to average net as-
 sets of (b):
 Expenses, net of waiv-
  ers and reimbursements      0.36%     0.36%     0.36%     0.36%     0.36%    0.36%
 Expenses, before waiv-
  ers and reimbursements      0.77%     0.76%     0.81%     0.88%     0.91%    0.95%
 Net investment income,
  net of waivers and re-
  imbursements                9.37%     9.61%     7.68%     5.83%     5.14%    4.84%
 Net investment income,
  before waivers and re-
  imbursements                8.96%     9.21%     7.23%     5.31%     4.59%    4.25%
Portfolio turnover rate      55.50%    89.97%    48.49%    47.68%    54.68%   48.67%
Net assets at end of pe-
 riod (in thousands)      $178,733  $182,999  $201,457  $153,675  $158,678  $96,209
- ------------------------------------------------------------------------------------
</TABLE>

<TABLE>
<CAPTION>
                                                 Class D
                              -------------------------------------------------
                              1999 (c)  1998    1997    1996    1995   1994 (d)
- --------------------------------------------------------------------------------
<S>                           <C>      <C>     <C>     <C>     <C>     <C>
Net asset value, beginning
 of period                     $19.97  $20.31  $20.66  $20.71  $19.53   $19.82
Income (loss) from invest-
 ment operations:
 Net investment income           0.89    1.78    1.43    1.07    0.94     0.23
 Net realized and unrealized
  gain (loss)                   (0.54)  (0.40)  (0.34)  (0.02)   1.18    (0.29)
- --------------------------------------------------------------------------------
Total income (loss) from in-
 vestment operations             0.35    1.38    1.09    1.05    2.12    (0.06)
- --------------------------------------------------------------------------------
Distributions to sharehold-
ers:
 Net investment income          (0.79)  (1.69)  (1.39)  (1.10)  (0.94)   (0.23)
 Net realized gain              (0.27)  (0.03)  (0.05)    --      --       --
- --------------------------------------------------------------------------------
Total distributions to
 shareholders                   (1.06)  (1.72)  (1.44)  (1.10)  (0.94)   (0.23)
- --------------------------------------------------------------------------------
Net increase (decrease)         (0.71)  (0.34)  (0.35)  (0.05)   1.18    (0.29)
- --------------------------------------------------------------------------------
Net asset value, end of pe-
 riod                          $19.26  $19.97  $20.31  $20.66  $20.71   $19.53
- --------------------------------------------------------------------------------
Total return (a)                 1.70%   7.08%   5.54%   5.22%  11.09%   (0.30)%
Ratio to average net assets
 of (b):
 Expenses, net of waivers
  and reimbursements             0.75%   0.75%   0.75%   0.75%   0.75%    0.75%
 Expenses, before waivers
  and reimbursements             1.16%   1.15%   1.20%   1.27%   1.30%    1.34%
 Net investment income, net
  of waivers and reimburse-
  ments                          8.98%   9.31%   7.48%   4.96%   4.85%    4.42%
 Net investment income, be-
  fore waivers and reim-
  bursements                     8.57%   8.91%   7.03%   4.44%   4.30%    3.83%
Portfolio turnover rate         55.50%  89.97%  48.49%  47.68%  54.68%   48.67%
Net assets at end of period
 (in thousands)                $  246  $  824  $  891  $  343  $   13   $    1
- --------------------------------------------------------------------------------
</TABLE>

(a) Assumes investment at net asset value at the beginning of the period,
    reinvestment of all dividends and distributions, and a complete redemption
    of the investment at the net asset value at the end of the period. Total
    return is not annualized for periods less than one year.
(b) Annualized for periods less than a full year.
(c) Financial highlights for the six months ended May 31, 1999 were calculated
    using average shares outstanding for the period.
(d) For the period September 14, 1994 (Class D shares issue date) through
    November 30, 1994.

See accompanying notes to financial statements.

                                      23
<PAGE>

Northern Institutional Funds
Fixed Income Portfolios
- -------------------------------------------------------------------------------
Financial Highlights
For the Six Months Ended May 31, 1999 (Unaudited) and the Years Ended November
30,
U.S. Government Securities Portfolio
<TABLE>
<CAPTION>
                                                Class A
                          ------------------------------------------------------------
                           1999       1998       1997       1996      1995      1994
- ----------------------------------------------------------------------------------------
<S>                       <C>       <C>        <C>        <C>       <C>       <C>
Net asset value, begin-
 ning of period           $ 20.27    $ 19.99    $ 20.07    $ 20.08   $ 19.05   $ 20.07
Income from investment
 operations:
 Net investment income       0.49       1.17       1.21       1.02      1.05      0.91
 Net realized and
  unrealized gain (loss)    (0.34)      0.26      (0.07)     (0.01)     1.02     (1.02)
- ----------------------------------------------------------------------------------------
Total income (loss) from
 investment operations       0.15       1.43       1.14       1.01      2.07     (0.11)
- ----------------------------------------------------------------------------------------
Distributions to share-
 holders:
 Net investment income      (0.49)     (1.15)     (1.22)     (1.02)    (1.04)    (0.91)
 Net realized gains         (0.29)        --         --         --        --        --
- ----------------------------------------------------------------------------------------
Total distributions to
 shareholders               (0.78)     (1.15)     (1.22)     (1.02)    (1.04)    (0.91)
- ----------------------------------------------------------------------------------------
Net increase (decrease)     (0.63)      0.28      (0.08)     (0.01)     1.03     (1.02)
- ----------------------------------------------------------------------------------------
Net asset value, end of
 period                   $ 19.64    $ 20.27    $ 19.99    $ 20.07   $ 20.08   $ 19.05
- ----------------------------------------------------------------------------------------
Total return (a)             0.68%      7.36%      5.93%      5.15%    11.18%    (0.57)%
Ratio to average net as-
 sets of (b):
 Expenses, net of waiv-
  ers and reimbursements     0.36%      0.36%      0.36%      0.36%     0.36%     0.36%
 Expenses, before waiv-
  ers and reimbursements     0.79%      0.86%      0.85%      0.94%     1.09%     1.12%
 Net investment income,
  net of waivers and re-
  imbursements               5.22%      6.01%      5.86%      5.22%     5.43%     4.62%
 Net investment income,
  before waivers and re-
  imbursements               4.79%      5.51%      5.37%      4.64%     4.70%     3.86%
Portfolio turnover rate     26.31%    115.55%     95.73%    119.75%   141.14%    45.55%
Net assets at end of pe-
 riod (in thousands)      $83,189    $48,317    $43,073    $92,351   $56,329   $25,293
- ----------------------------------------------------------------------------------------
</TABLE>

<TABLE>
<CAPTION>
                                     Class C                                      Class D
                          ------------------------------------- -------------------------------------------------
                           1999      1998     1997     1996 (c)  1999    1998    1997    1996    1995    1994 (e)
- ------------------------------------------------------------------------------------------------------------------
<S>                       <C>       <C>      <C>       <C>      <C>     <C>     <C>     <C>     <C>      <C>
Net asset value, begin-
 ning of period           $20.26    $19.98   $ 20.06    $20.13  $20.22  $19.94  $20.03  $20.04  $ 19.05  $ 19.43
Income from investment
 operations:
 Net investment income      0.03      1.12      1.14      0.91    0.50    1.08    1.16    0.96     0.96     0.22
 Net realized and
  unrealized gain (loss)    0.01      0.26     (0.04)    (0.12)  (0.38)   0.28   (0.10)  (0.03)    1.00    (0.38)
- ------------------------------------------------------------------------------------------------------------------
Total income from in-
 vestment operations        0.04      1.38      1.10      0.79    0.12    1.36    1.06    0.93     1.96    (0.16)
- ------------------------------------------------------------------------------------------------------------------
Distributions to share-
 holders:
 Net investment income     (0.08)    (1.10)    (1.18)    (0.86)  (0.45)  (1.08)  (1.15)  (0.94)   (0.97)   (0.22)
 Net realized gains        (0.29)       --        --        --   (0.29)     --      --      --       --       --
- ------------------------------------------------------------------------------------------------------------------
Total distributions to
 shareholders              (0.37)    (1.10)    (1.18)    (0.86)  (0.74)  (1.08)  (1.15)  (0.94)   (0.97)   (0.22)
- ------------------------------------------------------------------------------------------------------------------
Net increase (decrease)    (0.33)     0.28     (0.08)    (0.07)  (0.62)   0.28   (0.09)  (0.01)    0.99    (0.38)
- ------------------------------------------------------------------------------------------------------------------
Net asset value, end of
 period                   $19.93(d) $20.26   $ 19.98    $20.06  $19.60  $20.22  $19.94  $20.03  $ 20.04  $ 19.05
- ------------------------------------------------------------------------------------------------------------------
Total return (a)            0.20%     7.10%     5.67%     4.05%   0.53%   6.96%   5.52%   4.77%   10.66%   (0.90)%
Ratio to average net as-
 sets of (b):
 Expenses, net of waiv-
  ers and reimbursements    0.60%     0.60%     0.60%     0.60%   0.75%   0.75%   0.75%   0.75%    0.75%    0.75%
 Expenses, before waiv-
  ers and reimbursements    1.03%     1.10%     1.09%     1.18%   1.18%   1.25%   1.24%   1.33%    1.48%    1.51%
 Net investment income,
  net of waivers and
  reimbursements            1.52%     5.77%     5.63%     4.97%   4.83%   5.55%   5.50%   4.83%    5.08%    4.65%
 Net investment income,
  before waivers and
  reimbursements            1.09%     5.27%     5.14%     4.39%   4.40%   5.05%   5.01%   4.25%    4.35%    3.89%
Portfolio turnover rate    26.31%   115.55%    95.73%   119.75%  26.31% 115.55%  95.73% 119.75%  141.14%   45.55%
Net assets at end of pe-
 riod (in thousands)      $   --    $3,942   $ 3,118    $3,535  $  810  $1,224  $  312  $  225  $    67  $    13
- ------------------------------------------------------------------------------------------------------------------
</TABLE>

(a) Assumes investment at net asset value at the beginning of the period,
    reinvestment of all dividends and distributions, and a complete redemption
    of the investment at the net asset value at the end of the period. Total
    return is not annualized for periods less than one year.
(b) Annualized for periods less than a full year.
(c) For the period December 29, 1995 (Class C shares issue date) through
    November 30, 1996.
(d) Class C shares were fully redeemed as of February 10, 1999.
(e) For the period September 15, 1994 (Class D shares issue date) through
    November 30, 1994.

See accompanying notes to financial statements.

                                      24
<PAGE>

Northern Institutional Funds
Fixed Income Portfolios
- -------------------------------------------------------------------------------
Financial Highlights
For the Six Months Ended May 31, 1999 (Unaudited) and the Years Ended November
30,
U.S. Treasury Index Portfolio
<TABLE>
<CAPTION>
                                              Class A
                          -----------------------------------------------------
                           1999      1998     1997     1996     1995     1994
- ---------------------------------------------------------------------------------
<S>                       <C>       <C>      <C>      <C>      <C>      <C>
Net asset value, begin-
 ning of period           $ 21.77   $ 20.81  $ 20.60  $ 20.78  $ 18.77  $ 21.05
Income (loss) from in-
 vestment operations:
 Net investment income       0.54      1.23     1.26     1.19     1.11     1.15
 Net realized and
  unrealized gain (loss)    (1.04)     0.97     0.20    (0.18)    2.01    (1.93)
- ---------------------------------------------------------------------------------
Total income (loss) from
 investment operations      (0.50)     2.20     1.46     1.01     3.12    (0.78)
- ---------------------------------------------------------------------------------
Distributions to share-
 holders:
 Net investment income      (0.55)    (1.24)   (1.25)   (1.19)   (1.11)   (1.14)
 Net realized gains           --        --       --       --       --     (0.36)
- ---------------------------------------------------------------------------------
Total distributions to
 shareholders               (0.55)    (1.24)   (1.25)   (1.19)   (1.11)   (1.50)
- ---------------------------------------------------------------------------------
Net increase (decrease)     (1.05)     0.96     0.21    (0.18)    2.01    (2.28)
- ---------------------------------------------------------------------------------
Net asset value, end of
period                    $ 20.72   $ 21.77  $ 20.81  $ 20.60  $ 20.78  $ 18.77
- ---------------------------------------------------------------------------------
Total return (a)            (2.39)%   10.92%    7.44%    5.10%   16.95%   (3.80)%
Ratio to average net as-
 sets of (b):
 Expenses, net of waiv-
  ers and reimbursements     0.26%     0.26%    0.26%    0.26%    0.26%    0.26%
 Expenses, before waiv-
  ers and reimbursements     0.75%     0.77%    0.82%    1.04%    0.89%    0.79%
 Net investment income,
  net of waivers and
  reimbursements             5.24%     5.73%    6.36%    5.93%    5.09%    5.60%
 Net investment income,
  before waivers and
  reimbursements             4.75%     5.22%    5.80%    5.15%    4.46%    5.07%
Portfolio turnover rate     59.39%    69.84%   72.61%   42.49%   80.36%   52.80%
Net assets at end of pe-
 riod (in thousands)      $22,246   $22,085  $33,839  $26,273  $17,674  $37,305
- ---------------------------------------------------------------------------------
</TABLE>

<TABLE>
<CAPTION>
                              Class C                          Class D
                          -----------------  -------------------------------------------------
                           1999    1998 (c)   1999     1998    1997    1996    1995   1994 (d)
- ----------------------------------------------------------------------------------------------
<S>                       <C>      <C>       <C>      <C>     <C>     <C>     <C>     <C>
Net asset value, begin-
 ning of period           $21.81    $22.28   $21.74   $20.77  $20.57  $20.75  $18.77   $18.80
Income (loss) from in-
 vestment operations:
 Net investment income      0.45      0.21     0.61     1.13    1.20    1.17    1.00     0.09
 Net realized and
  unrealized gain (loss)   (1.02)    (0.52)   (1.16)    1.00    0.18   (0.24)   2.03    (0.03)
- ----------------------------------------------------------------------------------------------
Total income (loss) from
 investment operations     (0.57)    (0.31)   (0.55)    2.13    1.38    0.93    3.03     0.06
- ----------------------------------------------------------------------------------------------
Distributions to share-
 holders:
 Net investment income     (0.52)    (0.16)   (0.50)   (1.16)  (1.18)  (1.11)  (1.05)   (0.09)
- ----------------------------------------------------------------------------------------------
Total distributions to
 shareholders              (0.52)    (0.16)   (0.50)   (1.16)  (1.18)  (1.11)  (1.05)   (0.09)
- ----------------------------------------------------------------------------------------------
Net increase (decrease)    (1.09)    (0.47)   (1.05)    0.97    0.20   (0.18)   1.98    (0.03)
- ----------------------------------------------------------------------------------------------
Net asset value, end of
period                    $20.72    $21.81   $20.69   $21.74  $20.77  $20.57  $20.75   $18.77
- ----------------------------------------------------------------------------------------------
Total return (a)           (2.66)%   (1.39)%  (2.58)%  10.50%   7.03%   4.72%  16.43%    0.37%
Ratio to average net as-
 sets of (b):
 Expenses, net of waiv-
  ers and reimbursements    0.50%     0.50%    0.65%    0.65%   0.65%   0.65%   0.65%    0.65%
 Expenses, before waiv-
  ers and reimbursements    0.99%     1.01%    1.14%    1.16%   1.21%   1.43%   1.28%    1.18%
 Net investment income,
  net of waivers and
  reimbursements            5.00%     5.22%    4.85%    5.35%   6.07%   5.57%   5.41%    6.05%
 Net investment income,
  before waivers and
  reimbursements            4.51%     4.71%    4.36%    4.84%   5.51%   4.79%   4.78%    5.52%
Portfolio turnover rate    59.39%    69.84%   59.39%   69.84%  72.61%  42.49%  80.36%   52.80%
Net assets at end of pe-
 riod (in thousands)      $  140    $   17   $  508   $1,721  $1,707  $  848  $  286   $  --
- ----------------------------------------------------------------------------------------------
</TABLE>

(a) Assumes investment at net asset value at the beginning of the period,
    reinvestment of all dividends and distributions, and a complete redemption
    of the investment at net asset value at the end of the period. Total
    return is not annualized for periods less than one year.
(b) Annualized for periods less than a full year.
(c) For the period October 7, 1998 (Class C shares issue date) through
    November 30, 1998.
(d) For the period November 16, 1994 (Class D shares issue date) through
    November 30, 1994.

See accompanying notes to financial statements.

                                      25
<PAGE>

Northern Institutional Funds
Equity Portfolios
- --------------------------------------------------------------------------------
Statements of Investments
May 31, 1999
(All amounts in thousands, except shares)
(Unaudited)
<TABLE>
<CAPTION>


 Shares Description                              Value
- -------------------------------------------------------
                               Balanced Portfolio
 <C>    <S>                                     <C>
 COMMON STOCKS--50.4%
 Advertising--0.7%
  3,700 Interpublic Group of Cos., Inc.         $   280
 11,000 Snyder Communications, Inc.                 269
                                                -------
                                                    549
                                                -------
 Aerospace/Defense--0.5%
  6,000 United Technologies Corp.                   372
                                                -------
 Airlines--0.3%
  8,000 Southwest Airlines Co.                      256
                                                -------
 Auto Manufacturers--0.5%
  4,000 DaimlerChrysler AG                          350
                                                -------
 Banks--2.5%
  8,600 BankAmerica Corp.                           556
  8,500 Bank One Corp.                              481
  4,900 State Street Corp.                          374
 10,700 Wells Fargo & Co.                           428
                                                -------
                                                  1,839
                                                -------
 Beverages--0.5%
  5,000 Coca-Cola (The) Co.                         342
                                                -------
 Building Materials--0.3%
  8,000 Masco Corp.                                 228
                                                -------
 Chemicals--0.3%
  3,700 du Pont (E.I.) de Nemours & Co.             242
                                                -------
 Commercial Services--0.5%
 13,500 Paychex, Inc.                               400
                                                -------
 Computers--4.5%
  5,825 Cisco Systems, Inc.*                        635
  9,600 Computer Sciences Corp.                     621
  9,000 Dell Computer Corp.                         310
  5,000 EMC Corp.                                   498
  7,100 International Business Machines Corp.       826
  7,800 Sun Microsystems, Inc.*                     466
                                                -------
                                                  3,356
                                                -------
 Cosmetics/Personal Care--1.0%
  7,000 Gillette Co.                                357
  4,500 Procter & Gamble Co.                        420
                                                -------
                                                    777
                                                -------
 Diversified Financial Services--4.2%
  2,100 American Express Co.                        254
  2,100 Capital One Financial Corp.                 316
  9,000 Citigroup, Inc.                             596
  6,500 Fannie Mae                                  442
 11,000 Freddie Mac                                 642
    819 Goldman Sachs Group, Inc.                    56
  6,000 MBNA Corp.                                  166
  3,000 Merrill Lynch & Co., Inc.                   252
  3,800 Morgan Stanley, Dean Witter & Co.           367
                                                -------
                                                  3,091
                                                -------
 Electronics--1.4%
  7,800 Linear Technology Corp.                     413
 12,000 Solectron Corp.*                            656
                                                -------
                                                  1,069
                                                -------
</TABLE>
<TABLE>
<CAPTION>


 Shares Description                           Value
- ----------------------------------------------------
 <C>    <S>                                  <C>
 Environmental Control--0.6%
 10,000 Republic Services, Inc.*             $   235
  4,700 Waste Management, Inc.                   249
                                             -------
                                                 484
                                             -------
 Forest Products & Paper--0.8%
  4,000 Georgia-Pacific Corp.                    346
  5,700 International Paper Co.                  285
                                             -------
                                                 631
                                             -------
 Hand/Machine Tools--0.3%
  4,000 Black & Decker Corp.                     228
                                             -------
 Health Care--1.2%
  2,000 Guidant Corp.                            100
  4,400 Johnson & Johnson Co.                    408
  5,400 Medtronic, Inc.                          383
                                             -------
                                                 891
                                             -------
 Housewares--0.5%
 10,000 Newell Rubbermaid, Inc.                  405
                                             -------
 Insurance--1.4%
  6,250 American International Group, Inc.       714
  4,900 MBIA, Inc.                               335
                                             -------
                                               1,049
                                             -------
 Machinery--Diversified--0.5%
  7,200 Applied Materials, Inc.*                 396
                                             -------
 Media--1.1%
  4,900 Disney (The Walt) Co.                    143
  8,300 Fox Entertainment Group, Inc.            212
  6,400 Time Warner, Inc.                        436
                                             -------
                                                 791
                                             -------
 Miscellaneous Manufacturing--2.6%
 12,500 General Electric Co.                   1,271
  7,800 Tyco International Ltd.                  682
                                             -------
                                               1,953
                                             -------
 Office/Business Equipment--0.9%
 10,000 Pitney Bowes, Inc.                       637
                                             -------
 Oil & Gas Producers--3.0%
  4,500 Chevron Corp.                            417
  8,000 Conoco, Inc.                             217
  9,900 Exxon Corp.                              791
 13,800 Royal Dutch Petroleum Co.                781
                                             -------
                                               2,206
                                             -------
 Oil & Gas Services--1.2%
 11,000 Halliburton Co.                          455
  7,100 Schlumberger Ltd.                        427
                                             -------
                                                 882
                                             -------
 Pharmaceuticals--3.7%
  7,100 Bristol-Myers Squibb Co.                 487
  7,000 Cardinal Health, Inc.                    423
  6,000 Elan Corp. PLC ADR                       324
  4,200 Lilly (Eli) & Co.                        300
  8,800 Merck & Co., Inc.                        593
  2,700 Pfizer, Inc.                             289
  6,900 Schering-Plough Corp.                    311
                                             -------
                                               2,727
                                             -------
</TABLE>

See accompanying notes to financial statements.

                                       26
<PAGE>

- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>


 Shares Description                               Value
- --------------------------------------------------------
 <C>    <S>                                      <C>
 Pipelines--0.4%
  3,700 Enron Corp.                              $   264
                                                 -------
 Real Estate Investment Trusts--0.4%
  2,500 Apartment Investment & Management Co.*       105
  6,000 Equity Office Properties Trust               170
                                                 -------
                                                     275
                                                 -------
 Retail--5.4%
  7,300 Dayton-Hudson Corp.                          460
  5,750 Gap (The), Inc.                              360
 10,300 Home Depot (The), Inc.                       586
  4,100 Kohl's Corp.*                                280
  4,100 Lowe's Cos., Inc.                            213
 12,075 Staples, Inc.*                               347
 12,000 Starbucks Corp.*                             442
 28,000 Walgreen Co.                                 651
 16,800 Wal-Mart Stores, Inc.                        716
                                                 -------
                                                   4,055
                                                 -------
 Semiconductors--1.6%
 11,800 Intel Corp.                                  638
  3,000 Motorola, Inc.                               248
  2,800 Texas Instruments, Inc.                      306
                                                 -------
                                                   1,192
                                                 -------
 Software--1.7%
 15,300 Microsoft Corp.*                           1,235
                                                 -------
 Telecommunication Equipment--2.0%
 12,000 Lucent Technologies, Inc.                    682
  5,600 Nokia Oyj                                    398
  6,800 Tellabs, Inc.*                               398
                                                 -------
                                                   1,478
                                                 -------
 Telephone--3.4%
 10,200 Ameritech Corp.                              671
 12,450 AT&T Corp.                                   691
  4,000 BellSouth Corp.                              189
  6,800 MCI WorldCom, Inc.*                          587
  7,000 SBC Communications, Inc.                     358
                                                 -------
                                                   2,496
                                                 -------
 Textiles--0.5%
  5,400 Cintas Corp.                                 343
- --------------------------------------------------------
 TOTAL COMMON STOCKS (Cost $25,625)              $37,489
- --------------------------------------------------------
 PREFERRED STOCK--1.2%
  (Cost $1,000)
 Agency--1.2%
  1,000 Home Ownership Funding Corp.             $   897
- --------------------------------------------------------
</TABLE>
<TABLE>
<CAPTION>
  Principal
   Amount   Description                                                  Value
- -------------------------------------------------------------------------------
 <C>        <S>                                                         <C>
 ASSET-BACKED SECURITIES--3.8%
 Auto--1.9%
            Chevy Chase Auto Receivables Trust,
            Series 1997-4, Class A
 $  520       6.25%Due 6/15/04                                          $   522
            Olympic Automobile Receivable Trust,
            Series 1996-D, Class A-4
    600       6.05Due 8/15/02                                               603
            Western Financial Grantor Trust,
            Series 1995-5, Class A-1
    122       5.875Due 3/1/02                                               122
            Western Financial Owner Trust,
            Series 1997-A, Class A-3
    162       6.50Due 9/20/01                                               163
                                                                        -------
                                                                          1,410
                                                                        -------
 Credit Card--1.3%
            Circuit City Credit Card Master Trust,
            Series 1994-2, Class A
  1,000       8.00Due 11/15/03                                            1,012
                                                                        -------
 Home Equity Loans--0.6%
            IMC Excess CashFlow Securities Trust, Series 1997-A,
            Class A
    334       7.41Due 11/26/28(/1/)                                         308
            The Money Store Trust, Series 1997-1
    147       7.36Due 5/16/01(/1/)                                          138
                                                                        -------
                                                                            446
- -------------------------------------------------------------------------------
 TOTAL ASSET-BACKED SECURITIES (Cost $2,888)                            $ 2,868
- -------------------------------------------------------------------------------
 COLLATERALIZED MORTGAGE OBLIGATIONS--4.8%
            Commercial Mortgage Asset Trust,
            Series 1999-C1, Class A3
 $  300       6.64Due 9/17/10                                           $   294
            Credit Suisse First Boston Mortgage Securities Corp.,
            Series 1998-C2, Class A1
    378       5.96%Due 12/15/07                                             370
            Donaldson, Lufkin & Jenrette Mortgage Acceptance Corp.,
            Series 1994-Q8,
            Class 2-A1
    155       7.25Due 5/25/24                                               157
            First Union-Lehman Brothers-Bank of America Commercial
            Mortgage Trust,
            Series 1998-C2, Class A2
    510       6.56Due 11/18/08                                              505
            Lehman Brothers Commercial Conduit Mortgage Trust, Series
            1999-C1, Class A2
    680       6.78Due 6/1/39                                                687
            Mortgage Capital Funding, Inc.,
            Series 1998-MC1, Class A2
    605       6.66Due 1/18/08                                               603
            Nationslink Funding Corp., Series 1999-1, Class A2
  1,000       6.316Due 11/20/08                                             971
- -------------------------------------------------------------------------------
 TOTAL COLLATERALIZED MORTGAGE OBLIGATIONS (Cost $3,661)                $ 3,587
- -------------------------------------------------------------------------------
</TABLE>

See accompanying notes to financial statements.

                                       27
<PAGE>

Northern Institutional Funds
Equity Portfolios
- -------------------------------------------------------------------------------
Statements of Investments
May 31, 1999
(All amounts in thousands, except shares)
(Unaudited)
<TABLE>
<CAPTION>
 Principal
  Amount   Description                         Value
- ----------------------------------------------------------
                         Balanced Portfolio--Continued
 <C>       <S>                                <C>      <C>
 CORPORATE/FOREIGN GOVERNMENT  BONDS/NOTES--
 6.1%
 Auto--1.1%
           Ford Motor Credit Co.
 $  800      6.00%Due 1/14/03                 $    791
                                              --------
 Environmental Services--1.5%
           Waste Management, Inc.
    285      8.25Due 11/15/99                      288
    800      7.10Due 8/1/26, putable 8/1/03        817
                                              --------
                                                 1,105
                                              --------
 Insurance--1.7%
           Lumbermens Mutual Casualty Co.
    460      9.15Due 7/1/26(/1/)                   507
     90      8.45Due 12/1/97(/1/)                   89
           Salomon, Inc. Medium Term Note
    650      6.65Due 7/15/01                       656
                                              --------
                                                 1,252
                                              --------
 Oil & Gas Producers--0.6%
           Conoco, Inc.
    460      5.90Due 4/15/04                       451
                                              --------
 Special Purpose--0.4%
           Bunge Trade Ltd.
    330      9.25Due 5/1/02(/1/)                   326
                                              --------
 Telecommunications--0.8%
           MCI WorldCom, Inc.
    615      6.125Due 8/15/01                      614
- ----------------------------------------------------------
 TOTAL CORPORATE/FOREIGN  GOVERNMENT/BONDS
 (Cost $4,595)                                $  4,539
- ----------------------------------------------------------
 U.S. GOVERNMENT AGENCIES--7.8%
 Fannie Mae--3.5%
 $1,355      5.625%Due 5/14/04                $  1,332
   1355      5.25Due 1/15/09                     1,264
                                              --------
                                                 2,596
                                              --------
 Fannie Mae REMIC Trust--3.5%
           Series 92-200, Class E
    115      6.25Due 6/25/17                       114
           Pool #440700
   1277      6.00Due 11/1/28                     1,214
           Pool #452421
   1374      6.00Due 12/1/28                     1,306
                                              --------
                                              $  2,634
                                              --------
 Freddie Mac REMIC Trust--0.8%
           Pool #C18079
    563      6.00Due 11/1/28                       536
- ----------------------------------------------------------
 TOTAL U.S. GOVERNMENT AGENCIES
  (Cost $5,895)                               $  5,766
- ----------------------------------------------------------
</TABLE>
<TABLE>
<CAPTION>
 Principal
  Amount   Description                   Value
- -----------------------------------------------
U.S. GOVERNMENT OBLIGATIONS--17.3%
 <C>       <S>                          <C>
 U.S. Treasury Notes--15.5%
 $  775      7.75%Due 2/15/01           $   804
  6,960      6.625Due 7/31/01             7,122
  1,000      5.75Due 10/31/02             1,004
  2,415      7.50Due 2/15/05              2,616
                                        -------
                                         11,546
                                        -------
 U.S Treasury Inflationary Index
 Notes--1.8%
  1,300      3.625Due 1/15/08             1,301
- -----------------------------------------------
 TOTAL U.S. GOVERNMENT OBLIGATIONS
  (Cost $13,042)                        $12,847
- -----------------------------------------------
 FLOATING RATE BANK NOTES--1.6%
           Lloyds Bank PLC
 $  610      5.313%Due 6/15/99          $   523
           National Westminster Bank
    800      5.188Due 8/31/99               648
- -----------------------------------------------
 TOTAL FLOATING RATE BANK NOTES (Cost
 $1,244)                                $ 1,171
- -----------------------------------------------
 SHORT-TERM INVESTMENT--4.7%
  (Cost $3,474)
           CDC Marches, Paris, France
 $3,474      4.875%Due 6/1/99           $ 3,474
- -----------------------------------------------
 TOTAL INVESTMENTS--97.7%
  (Cost $61,424)                        $72,638
- -----------------------------------------------
 Other assets, less liabilities 2.3%    $ 1,713
- -----------------------------------------------
 NET ASSETS--100.0%                     $74,351
- -----------------------------------------------
- -----------------------------------------------
</TABLE>
 * Non-income producing security.
(/1/At)May 31, 1999, the Portfolio owned restricted securities valued at
    approximately $1,368 (1.8% of net assets), with an aggregate cost basis of
    $1,815. These securities may not be publicly sold without registration
    under the Securities Act of 1933. The value of these securities is
    determined by valuations supplied by pricing service brokers or, if not
    available, in accordance with procedures established by the Trustees.

See accompanying notes to financial statements.

                                      28
<PAGE>

- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>


 Shares Description                              Value
- --------------------------------------------------------
                          Diversified Growth Portfolio
 <C>    <S>                                     <C>
 COMMON STOCKS--98.4%
 Advertising--1.3%
 18,300 Interpublic Group of Cos., Inc.         $  1,386
 44,100 Snyder Communications, Inc.                1,078
                                                --------
                                                   2,464
                                                --------
 Aerospace & Defense--0.9%
 28,000 United Technologies Corp.                  1,738
                                                --------
 Airlines--0.6%
 38,000 Southwest Airlines Co.                     1,218
                                                --------
 Auto Manufacturers--0.9%
 20,000 DaimlerChrysler A.G.*                      1,749
                                                --------
 Banks--4.7%
 41,000 Bank One Corp.                             2,319
 41,400 BankAmerica Corp.                          2,678
 23,200 State Street Corp.                         1,769
 53,400 Wells Fargo & Co.                          2,136
                                                --------
                                                   8,902
                                                --------
 Beverages--1.0%
 28,000 Coca-Cola (The) Co.                        1,913
                                                --------
 Building Materials--0.6%
 38,000 Masco Corp.                                1,085
                                                --------
 Chemicals--0.6%
 18,000 du Pont (E.I.) de Nemours & Co.            1,178
                                                --------
 Commercial Services--0.8%
 52,500 Paychex, Inc.                              1,555
                                                --------
 Computers--8.5%
 27,575 Cisco Systems, Inc.*                       3,006
 44,800 Computer Sciences Corp.*                   2,898
 43,200 Dell Computer Corp.*                       1,488
 25,500 EMC Corp.*                                 2,540
 35,000 International Business Machines Corp.      4,071
 34,400 Sun Microsystems, Inc.*                    2,055
                                                --------
                                                  16,058
                                                --------
 Cosmetics/Personal Care--2.0%
 32,000 Gillette Co.                               1,632
 22,500 Procter & Gamble Co.                       2,101
                                                --------
                                                   3,733
                                                --------
 Diversified Financial Services--8.0%
 12,600 American Express Co.                       1,527
 10,200 Capital One Financial Corp.                1,537
 43,000 Citigroup, Inc.                            2,849
 28,100 Fannie Mae                                 1,911
 56,000 Freddie Mac                                3,266
</TABLE>
<TABLE>
<CAPTION>


 Shares Description                           Value
- -----------------------------------------------------
 <C>    <S>                                  <C>
  3,822 Goldman Sachs Group, Inc.*           $    260
 23,000 MBNA Corp.                                635
 14,600 Merrill Lynch & Co.                     1,226
 19,200 Morgan Stanley, Dean Witter & Co.       1,853
                                             --------
                                               15,064
                                             --------
 Electronics--2.6%
 38,200 Linear Technology Corp.                 2,025
 52,000 Solectron Corp.*                        2,847
                                             --------
                                                4,872
                                             --------
 Environmental Control--1.4%
 60,000 Republic Services, Inc.*                1,410
 22,000 Waste Management, Inc.                  1,163
                                             --------
                                                2,573
                                             --------
 Food--0.9%
 48,222 Keebler Foods Co.*                      1,615
                                             --------
 Forest Products & Paper--1.6%
 20,000 Georgia-Pacific Corp.                   1,729
 27,300 International Paper Co.                 1,365
                                             --------
                                                3,094
                                             --------
 Hand/Machine Tools--0.5%
 17,000 Black & Decker Corp.                      968
                                             --------
 Health Care--2.4%
 11,000 Guidant Corp.                             550
 22,500 Johnson & Johnson                       2,084
 26,000 Medtronic, Inc.                         1,846
                                             --------
                                                4,480
                                             --------
 Housewares--0.8%
 36,700 Newell Rubbermaid, Inc.                 1,486
                                             --------
 Insurance--3.0%
 33,775 American International Group, Inc.      3,861
 26,800 MBIA, Inc.                              1,831
                                             --------
                                                5,692
                                             --------
 Machinery-Diversified--1.0%
 36,000 Applied Materials, Inc.*                1,980
                                             --------
 Media--2.3%
 38,000 Disney (The Walt) Co.                   1,107
 50,200 Fox Entertainment Group, Inc.*          1,280
 30,000 Time Warner, Inc.                       2,042
                                             --------
                                                4,429
                                             --------
 Miscellaneous Manufacturing--5.5%
 68,500 General Electric Co.                    6,966
 39,000 Tyco International Ltd.                 3,408
                                             --------
                                               10,374
                                             --------
</TABLE>

See accompanying notes to financial statements.

                                       29
<PAGE>

Northern Institutional Funds
Equity Portfolios
- --------------------------------------------------------------------------------
Statements of Investments
May 31, 1999
(All amounts in thousands, except shares)
(Unaudited)
<TABLE>
<CAPTION>


 Shares Description                              Value
- -----------------------------------------------------------
                    Diversified Growth Portfolio--Continued
 <C>    <S>                                     <C>
 Oil & Gas Producers--8.1%
 22,000 Chevron Corp.                           $  2,039
 47,000 Conoco, Inc.*                              1,275
 50,800 Exxon Corp.                                4,058
 53,800 Halliburton Co.                            2,226
 63,800 Royal Dutch Petroleum Co. ADR              3,609
 33,500 Schlumberger Ltd. ADR                      2,016
                                                --------
                                                  15,223
                                                --------
 Pharmaceuticals--7.1%
 35,000 Bristol-Myers Squibb Co.                   2,402
 27,000 Cardinal Health, Inc.                      1,630
 31,000 Elan Corp. PLC*                            1,674
 20,500 Lilly (Eli) & Co.                          1,464
 48,800 Merck & Co., Inc.                          3,294
 13,400 Pfizer, Inc.                               1,433
 33,600 Schering-Plough Corp.                      1,514
                                                --------
                                                  13,411
                                                --------
 Pipelines--0.7%
 17,800 Enron Corp.                                1,270
                                                --------
 Real Estate Investments Trusts--0.7%
 11,100 Apartment Investment & Management Co.        466
 27,000 Equity Office Properties Trust               763
                                                --------
                                                   1,229
                                                --------
 Retail--11.4%
 42,000 Dayton-Hudson Corp.                        2,646
 28,200 Gap (The), Inc.                            1,764
 72,100 Home Depot (The), Inc.                     4,101
 33,300 Kohl's Corp.*                              2,270
 12,000 Lowe's Cos., Inc.                            623
 67,162 Staples, Inc.*                             1,931
 57,600 Starbucks Corp.*                           2,124
 96,000 Walgreen Co.                               2,232
 89,400 Wal-Mart Stores, Inc.                      3,811
                                                --------
                                                  21,502
                                                --------
 Semiconductors--3.3%
 65,600 Intel Corp.                                3,547
 15,500 Motorola, Inc.                             1,284
 13,000 Texas Instruments, Inc.                    1,422
                                                --------
                                                   6,253
                                                --------
 Software--3.4%
 79,000 Microsoft Corp.*                           6,374
                                                --------
 Telecommunication Equipment--3.8%
 60,000 Lucent Technologies, Inc.                  3,413
 27,000 Nokia OYJ                                  1,917
 32,400 Tellabs, Inc.*                             1,895
                                                --------
                                                   7,225
                                                --------
</TABLE>
<TABLE>
<CAPTION>
  Shares/
 Principal
  Amount   Description                                     Value
- ------------------------------------------------------------------
 <C>       <S>                                            <C>
 Telephone--7.1%
 48,000    Ameritech Corp.                                $  3,159
 61,050    AT&T Corp.                                        3,388
 45,000    BellSouth Corp.                                   2,123
 33,000    MCI WorldCom, Inc.*                               2,850
 37,000    SBC Communications, Inc.                          1,892
                                                          --------
                                                            13,412
                                                          --------
 Textiles--0.9%
 25,400    Cintas Corp.                                      1,613
- ------------------------------------------------------------------
 TOTAL COMMON STOCKS (Cost $121,027)                      $185,732
- ------------------------------------------------------------------
 SHORT-TERM INVESTMENTS--0.2%
 $  204    CDC Marches, Paris, France 4.875% Due 6/1/99   $    204
           U.S. Treasury Bill
    210    4.34% Due 6/10/99                                   210
- ------------------------------------------------------------------
 TOTAL SHORT-TERM INVESTMENTS
  (Cost $414)                                             $    414
- ------------------------------------------------------------------
 TOTAL INVESTMENTS--98.6%
  (Cost $121,441)                                         $186,146
- ------------------------------------------------------------------
 Other Assets, less liabilities--1.4%                        2,692
- ------------------------------------------------------------------
 NET ASSETS--100.0%                                       $188,838
- ------------------------------------------------------------------
- ------------------------------------------------------------------
</TABLE>
*Non-income producing security.

See accompanying notes to financial statements.

                                       30
<PAGE>

- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 Shares  Description                          Value
- -----------------------------------------------------
                             Equity Index Portfolio
 <C>     <S>                                 <C>
 COMMON STOCKS--98.2%
 Advertising--0.2%
  18,200 Interpublic Group Cos., Inc.        $  1,379
  22,100 Omnicom Group, Inc.                    1,547
                                             --------
                                                2,926
                                             --------
 Aerospace and Defense--1.4%
  73,000 AlliedSignal, Inc.                     4,239
 122,900 Boeing (The) Co.                       5,193
  16,600 General Dynamics Corp.                 1,091
   9,700 Goodrich (B.F.) Co.                      393
  51,408 Lockheed Martin Corp.                  2,079
   9,000 Northrop Grumman Corp.                   607
  44,100 Raytheon Co., Class B                  3,002
  59,200 United Technologies Corp.              3,674
                                             --------
                                               20,278
                                             --------
 Airlines--0.3%
  23,900 AMR Corp.*                             1,555
  18,600 Delta Air Lines, Inc.                  1,067
  44,075 Southwest Airlines, Co.                1,413
  11,500 U.S Airways Group, Inc.*                 558
                                             --------
                                                4,593
                                             --------
 Apparel--0.3%
   9,400 Fruit of the Loom, Inc., Class A*         97
   8,500 Liz Claiborne, Inc.                      306
  37,000 Nike, Inc., Class B                    2,255
   7,400 Reebok International Ltd.*               147
   4,700 Russell Corp.                            110
  15,700 VF Corp.                                 722
                                             --------
                                                3,637
                                             --------
 Auto Manufacturers--1.1%
 158,500 Ford Motor Co.                         9,044
  85,700 General Motors Corp.                   5,913
   8,720 Navistar International Corp.*            431
  10,220 PACCAR, Inc.                             576
                                             --------
                                               15,964
                                             --------
 Auto Parts and Equipment--0.3%
   9,900 Cooper Tire & Rubber Co.                 235
  21,784 Dana Corp.                             1,125
  73,790 Delphi Automotive Systems*             1,448
  20,400 Goodyear Tire & Rubber (The) Co.       1,218
  15,700 TRW, Inc.                                786
                                             --------
                                                4,812
                                             --------
 Banks--6.6%
  23,600 AmSouth Bancorportation                  670
  99,600 Bank of New York Co., Inc.             3,561
 154,042 Bank One Corp.                         8,713
 226,686 BankAmerica Corp.                     14,664
  38,800 BankBoston Corp.                       1,838
  12,500 Bankers Trust Corp.                    1,157
</TABLE>
<TABLE>
<CAPTION>
 Shares  Description                            Value
- -----------------------------------------------------------
 <C>     <S>                                   <C>      <C>
  40,700 BB&T Corp.                            $  1,486
 110,792 Chase Manhattan Corp.                    8,032
  20,400 Comerica, Inc.                           1,233
  34,875 Fifth Third Bancorp                      2,378
 129,756 First Union Corp.                        5,977
  90,400 Firstar Corp.                            2,605
  74,402 Fleet Financial Group, Inc.              3,060
  27,650 Huntington Bancshares, Inc.                957
  59,600 KeyCorp                                  2,071
  68,400 Mellon Bank Corp.                        2,441
  20,600 Mercantile Bancorp, Inc.                 1,204
  22,900 Morgan (J.P.) & Co., Inc.                3,190
  42,700 National City Corp.                      2,826
  39,400 PNC Bank Corp.                           2,256
  29,000 Regions Financial Corp.                  1,098
  14,100 Republic New York Corp.                    958
  21,600 Southtrust Corp.                           841
  21,000 State Street Corp.                       1,601
  22,700 Summit Bancorp                             929
  42,000 SunTrust Banks, Inc.                     2,835
  35,000 Synovus Financial Corp.                    704
  95,417 U.S. Bancorp                             3,101
  18,000 Union Planters Corp.                       744
  26,600 Wachovia Corp.                           2,347
 215,360 Wells Fargo & Co.                        8,614
                                               --------
                                                 94,091
                                               --------
 Beverages--2.6%
  62,600 Anheuser-Busch Cos., Inc.                4,574
   9,000 Brown-Forman Corp., Class B                600
 322,900 Coca-Cola (The) Co.                     22,058
  53,900 Coca-Cola Enterprises                    1,954
   4,800 Coors (Adolph) Co., Class B                228
 192,200 PepsiCo, Inc.                            6,883
                                               --------
                                                 36,297
                                               --------
 Biotechnology--0.6%
  66,700 Amgen, Inc.*                             4,219
  82,100 Monsanto Co.                             3,407
  31,400 Pioneer Hi-Bred International, Inc.      1,178
                                               --------
                                                  8,804
                                               --------
 Building Materials--0.1%
   5,200 Armstrong World Industries, Inc.           303
  44,400 Masco Corp.                              1,268
   7,100 Owens Corning Corp.                        280
                                               --------
                                                  1,851
                                               --------
 Chemicals--1.5%
  30,000 Air Products & Chemicals, Inc.           1,230
  29,000 Dow Chemical Co.                         3,523
 147,500 du Pont (E.I.) de Nemours & Co.          9,652
  10,375 Eastman Chemical Co.                       525
  16,387 Engelhard Corp.                            332
   7,700 Great Lakes Chemical Corp.                 348
  13,200 Hercules, Inc.                             461
</TABLE>

See accompanying notes to financial statements.

                                       31
<PAGE>

Northern Institutional Funds
Equity Portfolios
- --------------------------------------------------------------------------------
Statements of Investments
May 31, 1999
(All amounts in thousands, except shares)
(Unaudited)
<TABLE>
<CAPTION>
 Shares  Description                                Value
- -----------------------------------------------------------
                       Equity Index Portfolio--Continued
 <C>     <S>                                       <C>
  15,800 Morton International, Inc.                $    616
   8,600 Nalco Chemical Co.                             288
  20,700 Praxair, Inc.                                1,010
  22,000 Rohm & Haas Co.                                883
  22,500 Sherwin-Williams Co.                           693
  13,200 Sigma-Aldrich Corp.                            422
  17,400 Union Carbide Corp.                            893
   9,600 W.R. Grace & Company*                          171
                                                   --------
                                                     21,047
                                                   --------
 Commercial Services--0.6%
 100,611 Cendant Corp.*                               1,855
  10,500 Deluxe Corp.                                   379
  21,600 Dun & Bradstreet (The) Corp.                   756
  16,900 Ecolab, Inc.                                   718
  19,300 Equifax, Inc.                                  695
  12,800 H & R Block, Inc.                              617
  36,310 Mckesson HBOC, Inc.                          1,237
  32,100 Paychex, Inc.                                  951
  35,800 Service Corp. International                    687
                                                   --------
                                                      7,895
                                                   --------
 Computers--7.5%
  47,000 3Com Corp.*                                  1,284
  17,900 Apple Computer, Inc.*                          789
  28,400 Ascend Communications, Inc.*                 2,632
  22,600 Cabletron Systems, Inc.*                       336
  18,700 Ceridian Corp.*                                617
 206,875 Cisco Systems, Inc.*                        22,549
 220,957 Compaq Computer Corp.                        5,234
  20,800 Computer Sciences Corp.*                     1,346
   6,600 Data General Corp.*                             87
 333,300 Dell Computer Corp.*                        11,478
  64,500 Electronic Data Systems Corp.                3,628
  65,700 EMC Corp.*                                   6,545
  20,500 Gateway 2000, Inc.*                          1,247
 133,000 Hewlett-Packard Co.                         12,544
 241,800 International Business Machines Corp.       28,124
  31,900 Seagate Technology, Inc.*                      963
  24,600 Silicon Graphics, Inc.*                        304
 100,900 Sun Microsystems, Inc.*                      6,029
  34,100 Unisys Corp.*                                1,294
                                                   --------
                                                    107,030
                                                   --------
 Cosmetics/Personal Care--2.4%
   7,500 Alberto-Culver Co., Class B                    198
  34,400 Avon Products, Inc.                          1,701
  38,400 Colgate-Palmolive Co.                        3,835
 145,300 Gillette Co.                                 7,410
  13,900 International Flavors & Fragrances, Inc        572
  70,984 Kimberly-Clark Corp.                         4,166
 173,900 Procter & Gamble Co.                        16,238
                                                   --------
                                                     34,120
                                                   --------
</TABLE>
<TABLE>
<CAPTION>
 Shares  Description                                Value
- -----------------------------------------------------------
 <C>     <S>                                       <C>
 Distribution and Wholesale--0.1%
  23,575 Genuine Parts Co.                         $    794
                                                   --------
 Diversified Financial Services--5.3%
  59,300 American Express Co.                         7,186
  95,314 Associates First Capital Corp., Class A      3,908
  14,560 Bear Stearns Cos., Inc.                        646
   8,600 Capital One Financial Corp.                  1,296
 295,787 Citigroup, Inc.                             19,596
  14,700 Countrywide Credit Industries, Inc.            605
 135,800 Fannie Mae                                   9,234
  33,100 Franklin Resources, Inc.                     1,440
  88,900 Freddie Mac                                  5,184
  63,199 Household International, Inc.                2,741
  14,900 Lehman Brothers Holdings, Inc.                 814
 105,030 MBNA Corp.                                   2,901
  46,500 Merrill Lynch & Co., Inc.                    3,906
  75,649 Morgan Stanley, Dean Witter & Co.            7,300
  18,500 Providian Financial Corp.                    1,775
  52,525 Schwab (Charles) Corp.                       5,558
  21,700 SLM Holding Corp.                              901
                                                   --------
                                                     74,991
                                                   --------
 Electric--2.3%
  24,900 AES Corp.*                                   1,239
  18,000 Ameren Corp.                                   737
  25,100 American Electric Power Co.                  1,089
  19,800 Carolina Power & Light Co.                     866
  27,800 Central & South West Corp.                     716
  20,810 Cinergy Corp.                                  710
  14,200 CMS Energy Corp.                               660
  30,500 Consolidated Edison, Inc.                    1,481
  19,600 Constellation Energy Group, Inc.               611
  25,600 Dominion Resources, Inc.                     1,106
  19,000 DTE Energy Co.                                 828
  47,443 Duke Energy                                  2,861
  46,200 Edison International                         1,270
  32,300 Entergy Corp.                                1,048
  31,100 FirstEnergy Corp.                              989
  23,700 FPL Group, Inc.                              1,379
  16,800 GPU, Inc.                                      732
  15,000 New Century Energies, Inc.                     607
  24,500 Niagara Mohawk Power Corp.*                    364
  20,000 Northern States Power Co.                      521
  38,900 PacifiCorp                                     707
  29,300 Peco Energy Co.                              1,434
  50,100 PG&E Corp.                                   1,691
  19,800 PP&L Resources, Inc.                           594
  29,200 Public Service Enterprise Group, Inc.        1,225
  37,218 Reliant Energy, Inc.                         1,135
  91,300 Southern Co.                                 2,591
  37,012 Texas Utilities Co.                          1,666
  28,400 Unicom Corp.                                 1,202
                                                   --------
                                                     32,059
                                                   --------
</TABLE>

See accompanying notes to financial statements.

                                       32
<PAGE>

- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 Shares  Description                               Value
- ----------------------------------------------------------
 <C>     <S>                                      <C>
 Electrical Components & Equipment--0.3%
  57,300 Emerson Electric Co.                     $  3,660
                                                  --------
 Electronics--0.5%
   5,900 EG&G, Inc.                                    175
  16,500 Honeywell, Inc.                             1,561
  11,100 Johnson Controls, Inc.                        700
   5,800 Millipore Corp.                               194
  14,225 Parker Hannifin Corp.                         621
   6,500 PE Corp.-PE Biosystems Group                  726
  32,900 Solectron Corp.*                            1,801
   6,100 Tektronix, Inc.                               141
  20,800 Thermo Electron Corp.*                        398
   7,400 Thomas & Betts Corp.                          317
                                                  --------
                                                     6,634
                                                  --------
 Engineering and Construction--0.0%
   9,900 Fluor Corp.                                   369
   5,300 Foster Wheeler Corp.                           73
                                                  --------
                                                       442
                                                  --------
 Entertainment--0.1%
  16,500 Harrah's Entertainment, Inc.*                 357
  25,800 Mirage Resorts, Inc.*                         529
                                                  --------
                                                       886
                                                  --------
 Environmental Control--0.4%
  20,700 Browning-Ferris Industries, Inc.              859
  78,385 Waste Management, Inc.                      4,145
                                                  --------
                                                     5,004
                                                  --------
 Food--2.4%
  32,200 Albertson's, Inc.                           1,723
  36,000 American Stores, Co.                        1,188
  77,570 Archer-Daniels-Midland Co.                  1,164
  37,400 Bestfoods                                   1,870
  58,200 Campbell Soup Co.                           2,568
  64,100 ConAgra, Inc.                               1,671
  20,100 General Mills, Inc.                         1,616
   5,000 Great Atlantic & Pacific Tea Co., Inc.        164
  47,400 Heinz (H.J.) Co.                            2,290
  18,800 Hershey Foods Corp.                         1,020
  53,100 Kellogg Co.                                 1,842
  53,900 Kroger Co.*                                 3,157
  17,800 Quaker Oats Co.                             1,176
  43,000 Ralston-Ralston Purina Group                1,172
  42,500 RJR Nabisco Holdings Corp.                  1,315
  63,700 Safeway, Inc.*                              2,962
 119,500 Sara Lee Corp.                              2,868
  15,700 Supervalu, Inc.                               381
  43,600 Sysco Corp.                                 1,294
  19,500 Winn-Dixie Stores, Inc.                       698
  15,200 Wrigley (W.M.) Jr. Co.                      1,323
                                                  --------
                                                    33,462
                                                  --------
</TABLE>
<TABLE>
<CAPTION>
 Shares  Description                      Value
- -------------------------------------------------
 <C>     <S>                             <C>
 Forest Products & Paper--0.7%
   7,400 Boise Cascade Corp.             $    293
  12,500 Champion International Corp.         641
  28,900 Fort James Corp.                   1,058
  11,500 Georgia-Pacific Corp.                994
  53,744 International Paper Co.            2,687
  14,200 Louisiana-Pacific Corp.              288
  13,300 Mead Corp.                           497
   3,800 Potlatch Corp.                       150
   7,300 Temple-Inland, Inc.                  489
  13,150 Westvaco Corp.                       376
  26,100 Weyerhaeuser Co.                   1,620
  14,500 Willamette Industries, Inc.          614
                                         --------
                                            9,707
                                         --------
 Gas--0.1%
   3,000 Eastern Enterprises                  104
   6,200 NICOR, Inc.                          233
   4,100 NEOK, Inc.                           123
   4,600 Peoples Energy Corp.                 177
  31,393 Sempra Energy*                       675
                                         --------
                                            1,312
                                         --------
 Hand/Machine Tools--0.1%
  11,500 Black & Decker Corp.                 655
  12,400 Grainger (W.W.), Inc.                658
   5,000 Milacron, Inc.                       107
   8,100 Snap-On, Inc.                        293
  11,600 Stanley Works (The)                  378
                                         --------
                                            2,091
                                         --------
 Health Care--2.7%
   8,600 Allergan, Inc.                       800
   7,000 Bard (C.R.), Inc.                    320
   7,300 Bausch & Lomb, Inc.                  558
  37,500 Baxter International, Inc.         2,421
  32,600 Becton, Dickinson & Co.            1,263
  14,700 Biomet, Inc.                         587
  51,500 Boston Scientific Corp.*           1,954
  84,595 Columbia/HCA Healthcare Corp.      1,993
  39,500 Guidant Corp.                      1,975
  14,550 HCR Manor Care*                      389
  55,400 HEALTHSOUTH Corp.*                   741
  21,900 Humana, Inc.*                        275
 176,100 Johnson & Johnson                 16,311
   9,300 Mallinckrodt, Inc.                   322
  76,500 Medtronic, Inc.                    5,431
  11,000 St. Jude Medical, Inc.*              372
  40,600 Tenet Healthcare Corp.*              995
  24,400 United Healthcare Corp.            1,421
                                         --------
                                           38,128
                                         --------
 Holding Companies--Diversified--0.2%
  52,300 Seagram (The) Co. Ltd.             2,716
                                         --------
</TABLE>

See accompanying notes to financial statements.

                                       33
<PAGE>

Northern Institutional Funds
Equity Portfolios
- --------------------------------------------------------------------------------
Statements of Investments
May 31, 1999
(All amounts in thousands, except shares)
(Unaudited)
<TABLE>
<CAPTION>
 Shares  Description                                Value
- -----------------------------------------------------------
                       Equity Index Portfolio--Continued
 <C>     <S>                                       <C>
 Home Builders--0.0%
   7,800 Centex Corp.                              $    289
   4,600 Fleetwood Enterprises, Inc.                    117
   6,300 Kaufman & Broad Home Corp.                     152
   5,700 Pulte Corp.                                    136
                                                   --------
                                                        694
                                                   --------
 Home Furnishings--0.1%
  11,800 Maytag Corp.                                   833
  10,000 Whirlpool Corp.                                645
                                                   --------
                                                      1,478
                                                   --------
 Household Products/Wares--0.6%
   9,200 American Greetings Corp., Class A              263
  15,200 Avery-Dennison Corp.                           910
  15,300 Clorox Co.                                   1,544
  22,400 Fortune Brands, Inc.                           916
   4,600 Jostens, Inc.                                   97
   7,500 Tupperware Corp.                               167
  74,825 Unilever N.V., New York Shares               4,887
                                                   --------
                                                      8,784
                                                   --------
 Housewares--0.1%
  36,802 Newell Rubbermaid, Inc.                      1,490
                                                   --------
 Insurance--3.6%
  18,757 Aetna, Inc.                                  1,703
  30,000 Aflac, Inc.                                  1,530
 107,430 Allstate Corp.                               3,914
  32,970 American General Corp.                       2,382
 160,905 American International Group, Inc.          18,393
  33,400 AON Corp.                                    1,436
  21,300 Chubb (The) Corp.                            1,492
  27,000 CIGNA Corp.                                  2,518
  21,900 Cincinnati Financial Corp.                     902
  41,963 Conseco, Inc.                                1,282
  30,600 Hartford Financial Services Group, Inc.      1,935
  13,837 Jefferson-Pilot Corp.                          937
  13,200 Lincoln National Corp.                       1,343
  14,900 Loews Corp.                                  1,212
  33,750 Marsh & McLennan Cos., Inc.                  2,455
  13,000 MBIA, Inc.                                     888
  14,300 MGIC Investment Corp.                          688
   9,500 Progressive Corp.                            1,334
  17,700 Provident Companies, Inc.                      691
  17,800 SAFECO Corp.                                   782
  30,844 St. Paul Cos., Inc.                          1,097
  18,400 Torchmark Corp.                                614
  16,300 Transamerica Corp.                           1,196
  18,100 UNUM Corp.                                     974
                                                   --------
                                                     51,698
                                                   --------
</TABLE>
<TABLE>
<CAPTION>
 Shares  Description                            Value
- -------------------------------------------------------
 <C>     <S>                                   <C>
 Iron/Steel--0.1%
  25,727 Allegheny Teledyne, Inc.              $    526
  17,000 Bethlehem Steel Corp.*                     141
  11,500 Nucor Corp.                                574
  11,600 USX-U.S. Steel Group, Inc.                 312
                                               --------
                                                  1,553
                                               --------
 Leisure Time--0.3%
  12,000 Brunswick Corp.                            288
  80,329 Carnival Corp., Class A                  3,293
                                               --------
                                                  3,581
                                               --------
 Lodging--0.1%
  34,200 Hilton Hotels Corp.                        470
  31,800 Marriott International, Inc.             1,210
                                               --------
                                                  1,680
                                               --------
 Machinery--Construction and Mining--0.2%
  47,000 Caterpillar, Inc.                        2,579
   6,200 Harnischfeger Industries, Inc.              45
                                               --------
                                                  2,624
                                               --------
 Machinery--Diversified--0.6%
  48,300 Applied Materials, Inc.*                 2,657
   3,100 Briggs & Stratton Corp.                    194
   9,700 Case Corp.                                 456
   5,500 Cummins Engine Co., Inc.                   278
  31,200 Deere & Co.                              1,187
  29,200 Dover Corp.                              1,100
  21,550 Ingersoll-Rand Co.                       1,372
   7,700 McDermott International, Inc.              197
   1,100 NACCO Industries, Inc., Class A             82
  24,900 Rockwell International Corp.             1,374
                                               --------
                                                  8,897
                                               --------
 Media--3.3%
  92,500 CBS Corp.*                               3,862
  42,400 Clear Channel Communications, Inc.*      2,801
  96,900 Comcast Corp., Class A                   3,731
 269,300 Disney (The Walt) Co.                    7,843
  17,600 Donnelley (R.R.) & Sons Co.                638
  12,300 Dow Jones & Co., Inc.                      646
  36,900 Gannett Co., Inc.                        2,666
   9,400 King World Productions, Inc.*              314
  10,300 Knight Ridder, Inc.                        543
  25,800 McGraw-Hill Cos., Inc.                   1,338
  79,500 MediaOne Group, Inc.*                    5,873
   6,800 Meredith Corp.                             238
  23,900 New York Times Co., Class A                816
 160,700 Time Warner, Inc.                       10,938
   9,500 Times Mirror Co., Class A                  560
  15,600 Tribune Co.                              1,231
  91,100 Viacom, Inc., Class B*                   3,507
                                               --------
                                                 47,545
                                               --------
</TABLE>

See accompanying notes to financial statements.

                                       34
<PAGE>

- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 Shares  Description                                       Value
- ------------------------------------------------------------------
 <C>     <S>                                              <C>
 Metal Fabricate/Hardware--0.0%
   8,100 Timken (The) Co.                                 $    167
  12,075 Worthington Industries, Inc.                          155
                                                          --------
                                                               322
                                                          --------
 Metals--Diversified--0.4%
  29,800 Alcan Aluminium Ltd.                                  834
  48,100 Alcoa, Inc.                                         2,645
   5,200 ASARCO, Inc.                                           84
  21,700 Freeport-McMoRan Copper & Gold, Inc., Class B*        307
  23,700 Inco Ltd.*                                            338
   7,600 Phelps Dodge Corp.                                    394
  32,800 Placer Dome, Inc.                                     365
   8,400 Reynolds Metals Co.                                   447
                                                          --------
                                                             5,414
                                                          --------
 Mining--0.1%
  48,900 Barrick Gold Corp.                                    844
  30,100 Battle Mountain Gold Co.                               73
  11,950 Cyprus Amax Minerals Co.                              150
  34,100 Homestake Mining Co.                                  266
  21,897 Newmont Mining Corp.                                  390
                                                          --------
                                                             1,723
                                                          --------
 Miscellaneous Manufacturing--5.1%
  12,400 Cooper Industries, Inc.                               615
  30,400 Corning, Inc.                                       1,661
   9,000 Crane Co.                                             271
  17,500 Danaher Corp.                                       1,058
  42,400 Eastman Kodak Co.                                   2,867
   9,400 Eaton Corp.                                           820
   4,300 FMC Corp.*                                            285
 429,200 General Electric Co.                               43,644
  32,800 Illinois Tool Works, Inc.                           2,517
  11,900 ITT Industries, Inc.                                  449
  52,700 Minnesota Mining & Manufacturing Co.                4,519
   5,400 National Service Industries, Inc.                     199
  16,266 Pall Corp.                                            326
   5,700 Polaroid Corp.                                        120
  23,100 PPG Industries, Inc.                                1,402
  10,100 Raychem Corp.                                         351
  22,300 Tenneco, Inc.                                         520
  20,800 Textron, Inc.                                       1,853
 106,906 Tyco International Ltd.                             9,341
                                                          --------
                                                            72,818
                                                          --------
 Office & Business Equiptment--0.5%
  10,300 Harris Corp.                                          389
  35,700 Pitney Bowes, Inc.                                  2,276
  85,900 Xerox Corp.                                         4,827
                                                          --------
                                                             7,492
                                                          --------
</TABLE>
<TABLE>
<CAPTION>
 Shares  Description                            Value
- -------------------------------------------------------
 <C>     <S>                                   <C>
 Oil & Gas Producers--5.6%
  11,800 Amerada Hess Corp.                    $    707
  16,600 Anadarko Petroleum Corp.                   623
  14,500 Apache Corp.                               522
   9,700 Ashland, Inc.                              395
  42,700 Atlantic Richfield Co.                   3,573
  23,252 Burlington Resources, Inc.                 998
  85,500 Chevron Corp.                            7,925
  27,900 Coastal Corp.                            1,076
 318,500 Exxon Corp.                             25,440
   6,500 Helmerich & Payne, Inc.                    152
  11,313 Kerr-McGee Corp.                           526
 102,200 Mobil Corp.                             10,348
  45,300 Occidental Petroleum Corp.                 957
  33,400 Phillips Petroleum Co.                   1,751
  11,000 Rowan Cos., Inc.*                          186
 280,900 Royal Dutch Petroleum Co.               15,888
  12,300 Sunoco, Inc.                               374
  70,000 Texaco, Inc.                             4,585
  32,876 Union Pacific Resources Group, Inc.        458
  31,600 Unocal Corp.                             1,256
  40,300 USX-Marathon Group, Inc.                 1,206
                                               --------
                                                 78,946
                                               --------
 Oil & Gas Services--0.6%
  42,840 Baker Hughes, Inc.                       1,333
  57,600 Halliburton Co.                          2,383
  71,500 Schlumberger Ltd.                        4,303
                                               --------
                                                  8,019
                                               --------
 Packaging & Containers--0.1%
   4,000 Ball Corp.                                 195
   6,900 Bemis Co.                                  260
  16,000 Crown Cork & Seal Co., Inc.                502
  20,400 Owens-Illinois, Inc.*                      622
  10,906 Sealed Air Corp.*                          678
                                               --------
                                                  2,257
                                               --------
 Pharmaceuticals--7.6%
 198,800 Abbott Laboratories                      8,983
  13,100 ALZA Corp.*                                468
 172,700 American Home Products Corp.             9,952
 260,300 Bristol-Myers Squibb Co.                17,863
  35,650 Cardinal Health, Inc.                    2,152
 144,096 Lilly (Eli) & Co.                       10,294
 312,000 Merck & Co., Inc.                       21,060
 170,000 Pfizer, Inc.                            18,190
  66,520 Pharmacia & Upjohn, Inc.                 3,688
 192,500 Schering-Plough Corp.                    8,675
 107,600 Warner-Lambert Co.                       6,671
  12,500 Watson Pharmaceutical, Inc.*               479
                                               --------
                                                108,475
                                               --------
</TABLE>

See accompanying notes to financial statements.

                                       35
<PAGE>

Northern Institutional Funds
Equity Portfolios
- --------------------------------------------------------------------------------
Statements of Investments
May 31, 1999
(All amounts in thousands, except shares and number of contracts)
(Unaudited)
<TABLE>
<CAPTION>


 Shares  Description                            Value
- --------------------------------------------------------
                       Equity Index Portfolio--Continued
 <C>     <S>                                  <C>
 Pipelines--0.6%
  10,900 Columbia Energy Group                $      583
  12,600 Consolidated Natural Gas Co.                749
  46,000 Enron Corp.                               3,283
  14,400 Sonat, Inc.                                 510
  56,000 Williams (The) Cos., Inc.                 2,902
                                              ----------
                                                   8,027
                                              ----------
 Retail--6.0%
  19,600 Autozone, Inc.*                             567
  13,200 Circuit City Stores, Inc.                   948
  14,300 Consolidated Stores Corp.*                  492
  28,603 Costco Cos., Inc.*                        2,074
  51,100 CVS Corp.                                 2,351
  18,000 Darden Restaurants, Inc.                    384
  57,700 Dayton-Hudson Corp.                       3,635
  14,000 Dillards, Inc., Class A                     492
  29,150 Dollar General                              774
  27,500 Federated Department Stores, Inc.*        1,499
  74,650 Gap (The), Inc.                           4,670
   9,300 Harcourt General, Inc.                      457
 193,100 Home Depot (The), Inc.                   10,983
  19,300 IKON Office Solutions, Inc.                 269
  64,600 KMart Corp.*                                993
  20,700 Kohl's Corp.*                             1,411
  29,600 Limited (The), Inc.                       1,447
   5,100 Longs Drug Stores, Inc.                     178
  48,600 Lowe's Cos., Inc.                         2,524
  45,900 MAY Department Stores Co.                 1,988
 177,300 McDonald's Corp.                          6,826
  18,600 Nordstrom, Inc.                             660
  34,500 Penney (J.C.) Co., Inc.                   1,783
   6,900 Pep Boys-Manny, Moe & Jack                  130
  33,900 Rite Aid Corp.                              848
  50,200 Sears, Roebuck & Co.                      2,400
  60,400 Staples, Inc.*                            1,737
  13,000 Tandy Corp.                               1,073
  42,300 TJX Cos., Inc.                            1,269
  32,900 Toys "R" Us, Inc.*                          759
  19,930 Tricon Global Restaurants*                1,161
 130,800 Walgreen Co.                              3,041
 582,500 Wal-Mart Stores, Inc.                    24,829
  16,300 Wendy's International, Inc.                 444
                                              ----------
                                                  85,096
                                              ----------
 Savings & Loans--0.3%
   7,500 Golden West Financial Corp.                 712
  77,761 Washington Mutual, Inc.                   2,969
                                              ----------
                                                   3,681
                                              ----------
 Semiconductors--2.7%
  19,000 Advanced Micro Devices, Inc.*               351
 436,700 Intel Corp.                              23,609
</TABLE>
<TABLE>
<CAPTION>


 Shares  Description                                 Value
- -------------------------------------------------------------
 <C>     <S>                                       <C>
  11,500 KLA-Tencor Corp.*                         $      523
  18,500 LSI Logic Corp.*                                 686
  32,400 Micron Technology, Inc.*                       1,229
  78,600 Motorola, Inc.                                 6,509
  21,900 National Semiconductor Corp.*                    424
  51,100 Texas Instruments, Inc.                        5,589
                                                   ----------
                                                       38,920
                                                   ----------
 Software--6.4%
   8,000 Adobe Systems, Inc.                              593
 134,600 America Online, Inc.*                         16,068
   7,800 Autodesk, Inc.                                   215
  80,700 Automatic Data Processing, Inc.                3,324
  30,900 BMC Software, Inc.*                            1,528
  70,525 Computer Associates International, Inc.        3,337
  48,100 Compuware Corp.*                               1,494
  58,000 First Data Corp.                               2,606
  41,800 IMS Health, Inc.                               1,029
 661,100 Microsoft Corp.*                              53,343
  44,200 Novell, Inc.*                                  1,039
 188,600 Oracle Corp.*                                  4,680
  35,000 Parametric Technology Corp.*                     486
  30,500 Peoplesoft, Inc.*                                494
   3,500 Shared Medical Systems Corp.                     230
                                                   ----------
                                                       90,466
                                                   ----------
 Telecommunication Equipment--2.1%
  10,830 Andrew Corp.*                                    168
  21,900 General Instrument Corp.*                        847
 346,256 Lucent Technologies, Inc.                     19,693
  86,960 Nortel Networks Corp.                          6,522
   9,900 Scientific-Atlanta, Inc.                         350
  50,900 Tellabs, Inc.*                                 2,978
                                                   ----------
                                                       30,558
                                                   ----------
 Telecommunications--0.9%
  74,900 AirTouch Communications, Inc.*                 7,527
  22,500 Frontier Corp.                                 1,184
  37,700 Nextel Communications, Inc., Class A*          1,390
  57,650 Sprint Corp. (PCS Group)*                      2,594
                                                   ----------
                                                       12,695
                                                   ----------
 Telephone--7.8%
  36,000 Alltel Corp.                                   2,581
 144,000 Ameritech Corp.                                9,477
 412,255 AT&T Corp.                                    22,880
 203,360 Bell Atlantic Corp.                           11,134
 255,400 Bellsouth Corporation                         12,052
  18,100 CenturyTel, Inc.                                 693
 126,400 GTE Corp.                                      7,971
 240,170 MCI WorldCom, Inc.*                           20,745
 256,212 SBC Communications, Inc.                      13,099
  58,500 Sprint Corp. (FON Group)*                      6,596
  65,932 US West, Inc.                                  3,564
                                                   ----------
                                                      110,792
                                                   ----------
</TABLE>

                                       36
<PAGE>

- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>


   Shares Description                            Value
- ---------------------------------------------------------
 <C>      <S>                                  <C>
 Textiles--0.0%
   2,300  Springs Industries, Inc.             $       91
                                               ----------
 Tobacco--0.9%
 318,900  Philip Morris Cos., Inc.                 12,298
  24,400  UST, Inc.                                   744
                                               ----------
                                                   13,042
                                               ----------
 Toys, Games, and Hobbies--0.1%
  25,712  Hasbro, Inc.                                736
  54,545  Mattel, Inc.                              1,442
                                               ----------
                                                    2,178
                                               ----------
 Transportation--0.7%
  61,495  Burlington Northern Santa Fe Corp.        1,906
  28,400  CSX Corp.                                 1,333
  38,720  FDX Corp.*                                2,132
  14,400  Kansas City Southern Industries             810
  43,200  Laidlaw, Inc.                               302
  49,700  Norfolk Southern Corp.                    1,628
  32,400  Union Pacific Corp.                       1,848
                                               ----------
                                                    9,959
                                               ----------
 Trucking and Leasing--0.0%
   9,400  Ryder System, Inc.                          226
- ---------------------------------------------------------
 TOTAL COMMON STOCKS
  (Cost $866,946)                              $1,396,452
- ---------------------------------------------------------
 SHORT-TERM INVESTMENT--0.0%
          CDC Marches, Paris, France
   $30      4.875%Due 6/1/99                   $       30
          U.S. Treasury Bill #
 2,570      4.37%Due 6/24/99                        2,542
- ---------------------------------------------------------
 TOTAL SHORT-TERM INVESTMENTS (Cost $2,572)    $    2,572
- ---------------------------------------------------------
 TOTAL INVESTMENTS--98.4%
  (Cost $869,518)                              $1,399,024
- ---------------------------------------------------------
 Other assets, less liabilities--1.6%              22,444
- ---------------------------------------------------------
 NET ASSETS--100.0%                            $1,421,468
- ---------------------------------------------------------
- ---------------------------------------------------------
</TABLE>
OPEN FUTURES CONTRACTS:
<TABLE>
<CAPTION>
            Number of       Contract       Contract        Contract        Unrealized
 Type       Contracts        Amount        Position       Expiration          Loss
- -------------------------------------------------------------------------------------
<S>         <C>             <C>            <C>            <C>              <C>
S&P 500        82           $26,593          Long         June, 1999         $(529)
- -------------------------------------------------------------------------------------
</TABLE>
*Non-income producing security.
# Securities pledged to cover margin requirements for open futures contracts.

See accompanying notes to financial statements.

                                       37
<PAGE>

Northern Institutional Funds
Equity Portfolios
- --------------------------------------------------------------------------------
Statements of Investments
May 31, 1999
(All amounts in thousands, except shares)
(Unaudited)
<TABLE>
<CAPTION>
 Shares  Description                              Value
- ---------------------------------------------------------
                            Focused Growth Portfolio
 <C>     <S>                                     <C>
 COMMON STOCKS--98.8%
 Advertising--1.1%
  10,000 Interpublic Group Cos., Inc.            $    758
  40,400 Snyder Communications, Inc.                  987
                                                 --------
                                                    1,745
                                                 --------
 Aerospace/Defense--1.6%
  25,000 Boeing (The) Co.                           1,056
  25,000 United Technologies Corp.                  1,552
                                                 --------
                                                    2,608
                                                 --------
 Airlines--0.5%
  25,000 Southwest Airlines Co.                       802
                                                 --------
 Auto Manufacturers--0.8%
  15,000 DaimlerChrysler A.G. ADR                   1,312
                                                 --------
 Banks--3.0%
  22,500 Bank One Corp.                             1,272
  12,000 Chase Manhattan Corp.                        870
  15,000 State Street Corp.                         1,144
  40,000 Wells Fargo Co.                            1,600
                                                 --------
                                                    4,886
                                                 --------
 Commercial Services--1.2%
  30,000 Concord EFS, Inc.*                         1,016
  30,000 Paychex, Inc.                                889
                                                 --------
                                                    1,905
                                                 --------
 Computers--6.2%
  25,000 Apple Computer, Inc.*                      1,102
  30,300 Cisco Systems, Inc.*                       3,303
  30,000 Computer Sciences Corp.*                   1,941
  28,200 International Business Machines Corp.      3,280
  10,000 Sun Microsystems, Inc.*                      598
                                                 --------
                                                   10,224
                                                 --------
 Cosmetics/Personal Care--0.8%
  15,000 Procter & Gamble Co.                       1,401
                                                 --------
 Diversified Financial Services--8.9%
   7,500 American Express Co.                         909
  14,000 Capital One Financial Corp.                2,110
  36,250 Fannie Mae                                 2,465
  34,750 Freddie Mac                                2,026
   6,826 Goldman Sachs Group, Inc.                    464
  95,350 MBNA Corp.                                 2,634
  10,000 Merrill Lynch & Co., Inc.                    840
  17,000 Providian Financial Corp.                  1,631
  15,650 Schwab (Charles) Corp.                     1,656
                                                 --------
                                                   14,735
                                                 --------
</TABLE>
<TABLE>
<CAPTION>
 Shares  Description                             Value
- --------------------------------------------------------
 <C>     <S>                                    <C>
 Electronics--4.8%
  15,000 Johnson Controls, Inc.                 $    946
  10,000 Koninklijke Philip Electronics N.V.         860
  25,300 Linear Technology Corp.                   1,341
  22,000 Sanmina Corp.*                            1,650
  29,200 Solectron Corp.*                          1,599
  10,000 Teradyne, Inc.*                             528
  10,000 Waters Corp.*                               986
                                                --------
                                                   7,910
                                                --------
 Entertainment--0.6%
  20,000 International Speedway Corp. Class A        980
                                                --------
 Environmental Control--1.7%
  65,000 Republic Services, Inc.*                  1,528
  25,000 Waste Management, Inc.                    1,322
                                                --------
                                                   2,850
                                                --------
 Food--0.8%
  38,577 Keebler Foods Co.*                        1,292
                                                --------
 Forest Products & Paper--0.6%
  20,000 International Paper Co.                   1,000
                                                --------
 Hand/Machine Tools--0.9%
  15,000 Black & Decker Corp.                        854
  25,000 Kennametal, Inc.                            711
                                                --------
                                                   1,565
                                                --------
 Health Care--2.7%
  36,200 Guidant Corp.                             1,810
  25,000 Medtronic, Inc.                           1,775
  25,000 St. Jude Medical, Inc.*                     845
                                                --------
                                                   4,430
                                                --------
 Housewares--0.9%
  35,000 Newell Rubbermaid, Inc.                   1,418
                                                --------
 Insurance--3.2%
  29,200 American International Group, Inc.        3,338
  14,000 Progressive Corp.                         1,965
                                                --------
                                                   5,303
                                                --------
 Leisure Time--0.8%
  32,700 Carnival Corp., Class A                   1,341
                                                --------
 Machinery-Diversified--1.2%
  20,000 Applied Materials, Inc.*                  1,100
  15,000 Ingersoll-Rand Co.                          955
                                                --------
                                                   2,055
                                                --------
 Media--3.4%
  10,000 Adelphia Communications Co.*                755
  10,000 Cablevision Systems Corp., Class A*         789
  20,000 Clear Channel Communications, Inc.*       1,321
  40,000 Fox Entertainment Group., Inc.*           1,020
  26,300 Time Warner, Inc.                         1,790
                                                --------
                                                   5,675
                                                --------
</TABLE>

See accompanying notes to financial statements.

                                       38
<PAGE>

- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>

    -
 Shares  Description                              Value
- ---------------------------------------------------------
 <C>     <S>                                     <C>
 Miscellaneous Manufacturing--5.2%
  20,000 Danaher Corp.                           $  1,208
  45,000 General Electric Co.                       4,576
  31,000 Tyco International Ltd.                    2,709
                                                 --------
                                                    8,493
                                                 --------
 Office and Business Equipment--0.5%
  11,700 Pitney Bowes, Inc.                           746
                                                 --------
 Oil and Gas Producers--5.5%
  30,000 Apache Corp.                               1,081
  27,500 Burlington Resources, Inc.                 1,176
  10,000 Chevron Corp.                                927
  43,850 Conoco, Inc.*                              1,189
  36,550 Exxon Corp.                                2,919
  16,850 Mobil Corp.                                1,706
                                                 --------
                                                    8,998
                                                 --------
 Oil and Gas Services--1.4%
  25,000 Baker Hughes, Inc.                           778
  35,000 Halliburton Co.                            1,448
                                                 --------
                                                    2,226
                                                 --------
 Pharmaceuticals--2.8%
  22,000 Cardinal Health, Inc.                      1,328
  22,000 Merck & Co., Inc.                          1,485
  40,000 Schering-Plough Corp.                      1,803
                                                 --------
                                                    4,616
                                                 --------
 Pipelines--2.0%
  32,500 Enron Corp.                                2,320
  20,000 Williams (The) Cos., Inc.                  1,036
                                                 --------
                                                    3,356
                                                 --------
 Real Estate Investments Trust--0.7%
   5,600 Apartment Investment & Management Co.        235
  35,000 Equity Office Properties Trust               989
                                                 --------
                                                    1,224
                                                 --------
 Retail--12.4%
  30,000 Best Buy Company, Inc.*                    1,365
  17,500 Circuit City Stores, Inc.                  1,257
  24,350 Dayton-Hudson Corp.                        1,534
  31,250 Dollar General                               830
  50,000 Home Depot (The), Inc.                     2,844
  43,850 Kohl's Corp.*                              2,990
  90,000 Staples, Inc.*                             2,588
  50,000 Starbucks Corp.*                           1,844
  58,400 Walgreen Co.                               1,357
  90,000 Wal-Mart Stores, Inc.                      3,836
                                                 --------
                                                   20,445
                                                 --------
</TABLE>
<TABLE>
<CAPTION>
  Shares/
 Principal
  Amount   Description                                  Value
- ---------------------------------------------------------------
 <C>       <S>                                         <C>
 Semiconductors--4.5%
  40,000   Altera Corp.*                               $  1,393
  36,700   Intel Corp.                                    1,984
  20,000   Motorola, Inc.                                 1,656
  12,500   Texas Instruments, Inc.                        1,367
  22,500   Xilinx, Inc.*                                  1,000
                                                       --------
                                                          7,400
                                                       --------
 Software--3.8%
  65,000   Microsoft Corp.*                               5,244
  45,000   Novell, Inc.*                                  1,058
                                                       --------
                                                          6,302
                                                       --------
 Telecommunication Equipment--4.5%
  15,000   ADC Telecommunications, Inc.*                    733
  30,000   General Instrument Corp.*                      1,161
  39,000   Lucent Technologies, Inc.                      2,218
  17,000   Nokia OYJ                                      1,207
  36,000   Tellabs, Inc.*                                 2,106
                                                       --------
                                                          7,425
                                                       --------
 Telecommunications--3.5%
  39,000   Qwest Communications International, Inc.*      1,655
  37,500   Time Warner Telecom, Inc.*                       961
  22,000   United Pan-Europe Communications NV ADR*       1,356
   9,500   Vodafone Group PLC ADR                         1,818
                                                       --------
                                                          5,790
                                                       --------
 Telephone--5.3%
  30,000   Ameritech Corp.                                1,974
  33,750   AT&T Corp.                                     1,873
  40,000   BellSouth Corp.                                1,888
  35,000   MCI WorldCom, Inc.*                            3,023
                                                       --------
                                                          8,758
                                                       --------
 Textiles--1.0%
  25,000   Cintas Corp.                                   1,588
- ---------------------------------------------------------------
 TOTAL COMMON STOCKS (Cost $113,473)                   $162,804
- ---------------------------------------------------------------
 SHORT-TERM INVESTMENT--0.5% (Cost $781)
           CDC Marches, Paris, France
    $781   5.375% Due 12/1/98                          $    781
- ---------------------------------------------------------------
 TOTAL INVESTMENTS--99.3%
  (Cost $114,254)                                      $163,585
- ---------------------------------------------------------------
 Other assets, less liabilities--0.7%                     1,102
- ---------------------------------------------------------------
 NET ASSETS--100.0%                                    $164,687
- ---------------------------------------------------------------
- ---------------------------------------------------------------
</TABLE>
*Non-income producing security.

See accompanying notes to financial statements.

                                       39
<PAGE>

Northern Institutional Funds
Equity Portfolios
- --------------------------------------------------------------------------------
Statements of Investments
May 31, 1999
(All amounts in thousands, except shares)
(Unaudited)
<TABLE>
<CAPTION>
 Shares Description                         Value
- ----------------------------------------------------------
                      International Equity Index Portfolio
 <C>    <S>                                <C>
 COMMON STOCKS--97.2%
 Australia--2.5%
  3,500 Amcor Ltd.                         $    19
  5,800 AMP Ltd.                                63
  1,800 Ashton Mining Ltd.                       1
  1,766 Australian Gas Light Co. Ltd.           11
  6,399 Boral Ltd.                              10
  1,200 Brambles Industries Ltd.                32
 10,220 Broken Hill Proprietary Co. Ltd.       105
  3,500 Burns Philp & Co. Ltd.                   1
  5,532 Coca-Cola Amatil Ltd.                   24
  6,351 Coles Myer Ltd.                         33
  4,900 Colonial Ltd.                           17
  6,400 Crown Ltd.*                              4
    700 CSL Ltd.                                 6
  5,600 CSR Ltd.                                15
  2,600 David Jones Ltd.                         3
  1,300 Delta Gold NL                            2
  2,061 Email Ltd.                               4
  1,275 Evans Deakin Industries Ltd.             3
    831 Faulding (F.H.) & Co. Ltd.               5
  9,500 Foster's Brewing Group Ltd.             27
  3,209 Futuris Corp. Ltd.                       4
  7,616 General Property Trust Units            13
  3,334 GIO Australia Holdings Ltd.              9
  7,019 Goodman Fielder Ltd.                     7
  2,200 Hardie (James) Industries Ltd.           5
    408 Homestake Mining Co.                     3
    917 Iluka Resources Ltd.                     2
  1,400 Leighton Holdings Ltd.                   5
  2,747 Lend Lease Corp. Ltd.                   35
  9,325 M.I.M. Holdings Ltd.                     5
  1,956 Mayne Nickless Ltd.                      7
  1,200 Metal Manufactures Ltd.                  2
  7,800 National Australia Bank                127
  1,600 Newcrest Mining Ltd.                     3
 10,859 News Corp. Ltd.                         90
  9,384 Normandy Mining Ltd.                     7
  4,044 North Ltd.                               7
  1,485 Orica Ltd.                               8
  5,600 Pacific Dunlop Ltd.                     10
  4,800 Pioneer International Ltd.              11
  2,136 QBE Insurance Group Ltd.                 8
  4,315 QCT Resources Ltd.                       2
  1,414 Resolute Ltd.                            1
  1,400 RGC Ltd.*                                0
  1,656 RIO Tinto Ltd.                          23
    650 Rothmans Holdings Ltd.                   6
  3,300 Santos Ltd.                             10
  2,800 Schroders Property Fund                  4
  1,014 Smith (Howard) Ltd.                      8
    764 Sons of Gwalia Ltd.                      2
  3,372 Southcorp Holdings Ltd.                 14
  3,600 Star City Holdings Ltd.                  4
</TABLE>
<TABLE>
<CAPTION>
 Shares Description                                       Value
- ----------------------------------------------------------------
 <C>    <S>                                               <C>
  1,979 Stockland Trust Group                             $    4
  1,600 Suncorp-Metway Ltd.                                    9
  1,650 TABCORP Holdings Ltd.                                 12
 27,800 Telstra Corp. Ltd.                                   138
  1,373 Wesfarmers Ltd.                                       13
  7,095 Westfield Trust                                       14
 10,269 Westpac Banking Corp. Ltd.                            70
  6,155 WMC Ltd.                                              23
  6,302 Woolworths Ltd.                                       21
    260 Zimbabwe Platinum Mines Ltd.*                          0
                                                          ------
                                                           1,131
                                                          ------
 Austria--0.3%
     19 Austria Mikro Systeme International A.G.               1
     90 Austria Tabakwerke A.G.                                6
    168 Austrian Airlines Osterreichische                      4
     63 Bank Austria A.G.                                      3
     30 Bank Austria A.G. (Partial Certificates)               1
    639 BAU Holdings A.G.                                     33
     70 Bohler-Uddeholm A.G.                                   3
     12 BWT A.G.                                               2
    135 Flughafen Wien A.G.                                    6
     40 Generali Holding Vienna A.G.                           7
     26 Lenzing A.G.                                           1
     78 Mayr-Melnhof Karton A.G.                               4
     72 Nevia Beteiligungs A.G.*                               1
     58 Oesterreichische Brau-Beteiligungs A.G.                2
    179 Oesterreichische Elektrizitaetswirtschafts A.G.       23
    163 OMV A.G.                                              14
     90 Radex-Heraklith Industriebeteiligungs A.G.             3
     33 Universale-Bau A.G.                                    1
     82 VA Technologies A.G.                                   7
     50 Wienerberger Baustoffindustrie A.G.                    9
                                                          ------
                                                             131
                                                          ------
 Belgium--1.5%
     50 Barco Industries                                       8
     12 Bekaert N.V.                                           5
    120 Cimenteries CBR Cementbedrisven                       11
     50 Colruyt S.A.                                          33
     50 Compagnie Maritime Belge S.A.                          2
     50 D'ieteren Trading N.V.                                22
    285 Delhaize-Le Lion                                      25
    300 Electrabel S.A.                                       92
  4,150 Fortis A.G., Class B                                 133
     50 Glaverbel S.A.                                         5
    150 Groupe Bruxelles Lambert S.A.                         26
  1,626 KBC Bancassurance Holding                             99
    120 Petrofina S.A.                                        65
    450 Solvay S.A.                                           30
    475 Tractebel                                             63
    850 UCB S.A.                                              37
    150 Union Miniere Group                                    6
                                                          ------
                                                             662
                                                          ------
 Denmark--0.8%
     12 Aarhus Oliefabrik A/S, Class A                       --
     12 Aarhus Oliefabrik A/S, Class B, Limited Voting       --
</TABLE>

See accompanying notes to financial statements.

                                       40
<PAGE>

- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 Shares Description                                  Value
- -----------------------------------------------------------
 <C>    <S>                                         <C>
    82  Bang & Olufsen Holdings A/S, Class B        $     5
   231  Carlsberg A/S, Class A                           10
   178  Carlsberg A/S, Class B                            8
     6  Dampskibsselskabet af 1912 A/S, Class B          50
     5  Dampskibsselskabet Svendborg A/S, Class B        60
   343  Danisco A/S                                      17
   300  Den Danske Bank                                  32
    85  Det Ostasiatiske Kompagni A/S*                    1
   280  FLS Industries A/S, Class B                       7
   206  GN Store Nord A/S                                 7
   176  International Service System A/S, Class B         9
    82  Korn-OG Foderstofkomp                             2
     6  Lauritzen (J.) Holding A/S                        1
    45  NKT Holdings A/S                                  3
   447  Novo-Nordisk A/S, Class B                        46
    45  Radiometer A/S, Class B                           2
   257  SAS Danmark A/S                                   3
   164  Superfos A/S                                      2
   643  Tele Danmark A/S                                 65
   315  Unidanmark A/S, Class A                          22
                                                    -------
                                                        352
                                                    -------
 Finland--1.7%
   100  Amer Group Ltd., Class A                          1
   200  Asko OYJ                                          4
   300  Cultor OYJ, Series 1                              6
   100  Cultor OYJ, Series 2                              2
   400  Hartwall Oy AB, Class A                           6
   100  Instrumentarium Group Oy, Class A                 4
   900  Kemira OYJ                                        6
   600  Kesko Oy*                                         8
   100  Kone OYJ, Class B                                13
 4,900  Merita Ltd.                                      29
   100  Metra OYJ, Class A                                2
   200  Metra OYJ, Class B                                4
 7,200  Nokia OYJ                                       513
   700  Outokumpu OYJ, Class A                            7
   100  Pohjola Group Insurance Corp., Class A            5
   100  Pohjola Group Insurance Corp., Class B            5
 1,000  Raisio Group PLC                                 11
   800  Rautaruukki OYJ, Class K                          5
   400  Sampo Insurance Co. Ltd., Class A                12
 2,600  Sonera Group OYJ                                 51
   100  Stockman AB, Class A                              2
   200  Stockman AB, Class B                              3
   300  Tieto Corp. OYJ                                  10
 1,600  Upm-Kymmene OYJ                                  47
   500  Valmet Corp.                                      5
                                                    -------
                                                        761
                                                    -------
 France--9.4%
   200  Accor S.A.                                       49
 1,055  Air Liquide                                     159
 1,170  Alcatel S.A.                                    139
 2,050  Axa                                             237
 1,321  Banque Nationale de Paris                       112
</TABLE>
<TABLE>
<CAPTION>
 Shares Description                                                     Value
- -----------------------------------------------------------------------------
 <C>    <S>                                                             <C>
    10  Bongrain S.A.                                                   $   4
   150  Bouygues                                                           40
   190  Canal Plus                                                         55
   400  Cap Gemini S.A.                                                    58
 1,350  Carrefour Supermarche S.A.                                        178
    50  Chargeurs S.A.                                                      3
   100  Club Mediterranee                                                   9
    50  Coflexip Stena Offshore                                             4
   527  Compagnie de Saint Gobain                                          83
   100  Compagnie Francaise d'Ettudes et de Construction Technip           11
    50  Compagnie Generale de Geophysique S.A.                              2
    75  Compagnie Parisienne de Reescompte                                  3
   600  Dassault Systemes S.A.                                             20
 1,600  Elf Aquitaine S.A.                                                232
   165  Eridania Beghin-Say S.A.                                           24
    60  Essilor International S.A.                                         21
   450  Etablissements Economiques du Casino                               43
 6,025  France Telecom S.A.                                               463
    42  Gecina                                                              5
   455  Groupe Danone                                                     126
   100  Groupe GTM                                                         10
   100  Imetal S.A.                                                        13
   410  L'OREAL                                                           247
 1,300  Lafarage S.A.                                                     117
   750  Lagardere S.C.A.                                                   29
   170  Legrand S.A.                                                       35
   540  LVMH Moet Hennessy Louis Vuitton                                  151
   808  Michelin, Class B                                                  36
   100  Natexis                                                             5
   100  Nord-Est S.A.                                                       3
   950  Paribas                                                           103
   150  Pathe                                                              14
   400  Pechiney S.A.                                                      16
   350  Pernod-Ricard                                                      23
   675  Pinault Printemps-Redoute S.A.                                    115
   150  Primagaz Cie                                                       14
   120  Promodes                                                           79
   300  PSA Peugeot Citroen                                                45
 2,200  Rhone-Poulenc, Class A                                            105
    30  Sagem S.A.                                                         18
 2,600  Sanofi-Synthelabo S.A.*                                           110
   850  Schneider Electric S.A.                                            51
    50  SEB S.A.                                                            4
   300  SEITA                                                              18
   200  Sidel S.A.                                                         28
   100  Simco S.A.                                                          9
   100  Skis Rossignol S.A.                                                 1
   350  Societe BIC S.A.                                                   20
    21  Societe Eurafrance S.A.                                            12
    50  Societe Francaise d'Investissements Immobiliers et de Gestion       3
   590  Societe Generale, Class A                                         107
   210  Sodexho Alliance S.A.                                              34
</TABLE>

See accompanying notes to financial statements.

                                       41
<PAGE>

Northern Institutional Funds
Fixed Income Portfolios
- --------------------------------------------------------------------------------
Statements of Investments
May 31, 1999
(All amounts in thousands, except shares)
(Unaudited)
<TABLE>
<CAPTION>
 Shares Description                                                 Value
- --------------------------------------------------------------------------
                International Equity Index Portfolio--Continued
 <C>    <S>                                                        <C>
 France--Continued
    150 Sommer-Allibert                                            $     4
    867 Suez Lyonnaise des Eaux                                        144
    900 Thomson CSF                                                     29
  1,450 Total S.A., Class B                                            177
     50 Union du Credit-Bail Immobilier                                  7
  1,400 Usinor S.A.                                                     19
    454 Valeo S.A.                                                      37
  2,760 Vivendi                                                        205
     20 Zodiac S.A.                                                      4
                                                                   -------
                                                                     4,281
                                                                   -------
 Germany--8.6%
    250 Adidas-Salomon A.G.                                             25
    250 Agiv A.G.                                                        5
  1,360 Allianz A.G.                                                   373
     50 AMB Aachener & Muenchener Beteilgungs- A.G. (Bearer)             5
    200 AMB Aachener & Muenchener Beteilgungs- A.G. (Registered)        22
    150 Axa Colonia Konzern A.G.                                        14
  3,400 BASF A.G.                                                      133
  3,950 Bayer A.G.                                                     154
  2,237 Bayerische HypoVereinsbank A.G.                                121
    450 Beiersdorf A.G.                                                 29
    200 Bilfinger & Berger Bau A.G.                                      5
    600 Continental A.G.                                                14
  5,317 DaimlerChrysler A.G.                                           460
    550 Degussa-Huels A.G.*                                             22
  2,900 Deutsche Bank A.G.                                             152
  2,050 Deutsche Lufthansa A.G. (Registered)                            44
 12,000 Deutsche Telekom A.G.                                          480
    400 Deutz A.G.*                                                      3
    200 Douglas Holdings A.G.                                            9
  2,800 Dresdner Bank A.G.                                             104
    400 FAG Kugelfischer Georg Schaefer A.G.                             4
    270 Heidelberger Zement A.G.                                        22
    400 Hochtief A.G.                                                   18
    100 IWKA A.G.                                                        2
     70 Karstadt A.G.                                                   29
     70 Linde A.G.                                                      41
    600 MAN A.G.                                                        18
  2,100 Mannesmann A.G.                                                288
    950 Merck KGaA                                                      33
  1,460 Metro A.G.                                                      92
  1,450 Muenchener Ruckversicherungs-Gesellschaft  A.G.                248
    763 Preussag A.G.                                                   39
    100 Rheinmetall A.G.                                                 2
  2,550 RWE A.G.                                                       114
    350 SAP A.G.                                                       122
    350 Schering A.G.                                                   37
    100 SGL Carbon A.G.                                                  7
  3,100 Siemens A.G.                                                   209
</TABLE>
<TABLE>
<CAPTION>
 Shares Description                                 Value
- ----------------------------------------------------------
 <C>    <S>                                        <C>
  3,100 Thyssen Krupp A.G.*                        $    61
  2,700 Veba A.G.                                      154
    150 Viag A.G.                                       68
  1,700 Volkswagen A.G.                                106
                                                   -------
                                                     3,888
                                                   -------
 Hong Kong--2.4%
 10,000 Applied International Holdings                  --
  8,304 Bank of East Asia Ltd.*                         18
 20,000 Cathay Pacific Airways                          31
 14,000 Cheung Kong Ltd.                               114
 12,000 Chinese Estates Holdings                         2
 14,500 CLP Holdings Ltd.                               70
  2,000 Dickson Concepts International Ltd               1
  5,000 Elec & Eltek International Holdings Ltd.         1
  6,000 Giordano International Ltd.                      3
  8,000 Hang Lung Development Co.                        9
 11,300 Hang Seng Bank Ltd.                            121
 28,292 Hong Kong & China Gas Co. Ltd.                  40
  7,500 Hong Kong & Shanghai Hotels Ltd.                 6
  1,200 Hong Kong Aircraft Engineering Co. Ltd.          2
  3,000 Hong Kong Construction Holdings                  1
 70,800 Hong Kong Telecommunications Ltd.              164
  5,600 Hopewell Holdings Ltd.                           3
 23,000 Hutchinson Whampoa Ltd.                        192
  6,222 Hysan Development Co. Ltd.                       9
  5,800 Johnson Electric Holdings Ltd.                  21
  3,000 Miramar Hotel & Investment Ltd.                  4
 11,879 New World Development Co. Ltd.                  29
 12,000 Oriental Press Group                             2
  2,000 Playmates Toys Holdings                         --
 26,400 Regal Hotels International                       3
 11,000 Shangri-La Asia Ltd.                            12
 12,000 Shun TAK Holdings Ltd.                           4
 20,963 Sino Land Co.                                   11
  2,000 South China Morning Post Holdings Ltd.          --
 12,000 Stelux Holdings                                  6
 14,172 Sun Hung Kai Properties Ltd.                   113
  9,000 Swire Pacific Ltd.                              43
  5,000 TAI Cheung Holdings Ltd.                         1
  2,000 Television Broadcasts Ltd.                       8
  2,000 Varitronix International Ltd.                    4
 14,000 Wharf Holdings Ltd.                             36
  1,500 Wing Lung Bank                                   5
                                                   -------
                                                     1,089
                                                   -------
 Ireland--0.5%
  5,168 Allied Irish Banks PLC                          69
    275 Clondalkin Group PLC Units                       2
    293 Crean (James) PLC                               --
  2,304 CRH PLC                                         40
    540 DCC PLC                                          4
  1,912 Fyffes PLC                                       4
  1,245 Greencore Group PLC                              5
  1,734 Independent Newspapers PLC                       9
    168 Irish Continental Group PLC                      2
</TABLE>

See accompanying notes to financial statements.

                                       42
<PAGE>

- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 Shares Description                                 Value
- ----------------------------------------------------------
 <C>    <S>                                        <C>
  2,905 Irish Life & Permanent PLC                 $    37
    263 Jurys Hotel Group PLC                            2
    971 Kerry Group PLC, Class A                        12
    972 Ryanair Holdings PLC*                            9
  6,555 Smurfit (Jefferson) Group PLC                   17
  1,489 Tullow Oil PLC*                                  1
  4,995 Waterford Wedgewood PLC Units                    5
                                                   -------
                                                       218
                                                   -------
 Italy--4.5%
  9,000 Alitalia S.p.A.                                 27
  1,000 Arnoldo Mondadori Editore S.p.A.                17
  6,000 Assicurazioni Generali                         214
 11,000 Banca Commerciale Italiana                      79
 13,000 Banca Intesa S.p.A.                             66
  4,000 Banca Intesa-RNC S.p.A.                         10
  2,000 Banco Popolare di Milano                        16
 11,000 Benetton Group S.p.A.                           22
  2,000 Bulgari S.p.A.                                  12
  1,000 Cartiere Burgo S.p.A.                            7
  2,200 Cementir S.p.A.                                  2
  4,000 Edison S.p.A.                                   35
 47,000 ENI S.p.A.                                     294
  1,000 Falck S.p.A.                                     8
 21,400 Fiat S.p.A.                                     69
  4,300 Fiat-RNC S.p.A.                                  7
  4,000 Impregilo S.p.A.                                 3
 24,000 Istituto Nationale Assicurazioni                56
  1,000 Italcementi S.p.A.                              11
  1,000 Italcementi-RNC S.p.A.                           4
  4,000 Italgas S.p.A.                                  17
  3,200 Magneti Marelli                                  4
  7,000 Mediaset S.p.A.                                 57
  3,000 Mediobanca S.p.A.                               34
 29,000 Montedison S.p.A.                               26
  4,000 Montedison-RNC S.p.A.                            3
 17,240 Olivetti S.p.A.*                                54
  9,000 Parmalat Finanziaria S.p.A.                     12
 11,000 Pirelli S.p.A.                                  31
  1,000 Pirelli-RNC S.p.A.                               2
  1,000 Reno de Medici S.p.A.                            2
  1,000 Rinascente (La) S.p.A.                           9
  3,000 Riunione Adriatic di Sicurta S.p.A.             29
  1,000 Riunione Adriatic di Sicurta-RNC S.p.A.          8
  8,180 San Paolo-IMI S.p.A.                           111
  1,000 Sirti S.p.A.                                     5
  4,000 Snia BPD S.p.A.                                  5
  1,000 Snia BPD-RNC S.p.A.                              1
  1,000 Societa Assicuratrice Industriale S.p.A.        11
 39,000 Telecom Italia Mobile S.p.A.                   230
  9,000 Telecom Italia Mobile-RNC S.p.A.                30
 22,111 Telecom Italia S.p.A.                          229
  5,488 Telecom Italia-RNC S.p.A.                       30
 29,000 Unicredito Italiano S.p.A.                     137
 28,000 Unione Immobiliare S.p.A.                       13
                                                   -------
                                                     2,049
                                                   -------
</TABLE>
<TABLE>
<CAPTION>
 Shares Description                            Value
- -----------------------------------------------------
 <C>    <S>                                   <C>
 Japan--22.6%
  2,000 77 Bank                               $    17
    900 Acom Co. Ltd.                              65
    600 Advantest Corp.                            48
  4,000 Ajinomoto Co.                              43
  1,000 Alps Electric Co. Ltd.                     22
  2,000 Amada Co. Ltd.                             13
  1,000 Amano Corp.                                 8
  3,000 Aoki Corp.*                                 2
    400 Aoyama Trading                             12
    300 Arabian Oil Co.                             5
 15,000 Asahi Bank Ltd.                            71
  3,000 Asahi Breweries Ltd.                       38
  9,000 Asahi Chemical Industry Co. Ltd.           49
  7,000 Asahi Glass Co. Ltd.                       45
  4,000 Ashikaga Bank Ltd.                          8
    200 Autobacs Seven Co. Ltd.                     8
 27,000 Bank of Tokyo-Mitsubishi Ltd.             362
  7,000 Bank of Yokohama Ltd.                      19
  5,000 Bridgestone Corp.                         131
  2,000 Brother Industries Ltd.                     6
  5,000 Canon, Inc.                               126
  2,000 Casio Computer Co. Ltd.                    14
  5,000 Chiba Bank Ltd.                            20
  1,000 Chiyoda Corp.*                              2
  1,000 Chugai Pharmaceutical Co. Ltd.             11
  2,000 Citizen Watch Co. Ltd.                     15
  4,000 Cosmo Oil Co. Ltd.                          7
  1,000 Credit Saison Co. Ltd.                     20
    400 CSK Corp.                                  10
  5,000 Dai Nippon Printing Co. Ltd.               17
  2,000 Daicel Chemical Industry Ltd.              75
  3,000 Daido Steel Co. Ltd.                        6
  4,000 Daiei, Inc.                                 5
  1,000 Daifuku Co. Ltd.                           12
  2,000 Daiichi Pharmaceutical                      6
  2,000 Daikin Industries Ltd.                     32
  1,000 Daikyo, Inc.                               18
  2,000 Daimaru, Inc.                               3
  5,000 Dainippon Ink & Chemicals, Inc.             8
  1,000 Dainippon Screen MFG Co. Ltd.               5
    800 Daito Trust Construction Co.                9
  3,000 Daiwa House Industry Co. Ltd.              32
  1,000 Daiwa Kosho Lease Co. Ltd.                  3
  8,000 Daiwa Securities Co. Ltd.                  42
  3,000 Denki Kagaku Kogyo Kabushiki Kaisha         5
  5,000 Denso Corp.                                93
     24 East Japan Railway Co.                    139
  2,000 Ebara Corp.                                23
  2,000 Eisai Co. Ltd.                             37
  1,000 Ezaki Glico Co. Ltd.                        6
  1,400 Fanuc                                      60
 20,000 Fuji Bank Ltd.                            127
  3,000 Fuji Photo Film Co.                       107
  2,000 Fujikura Ltd.                              10
</TABLE>

See accompanying notes to financial statements.

                                       43
<PAGE>

Northern Institutional Funds
Equity Portfolios
- --------------------------------------------------------------------------------
Statements of Investments
May 31, 1999
(All amounts in thousands, except shares)
(Unaudited)
<TABLE>
<CAPTION>
 Shares Description                                 Value
- ---------------------------------------------------------------
                International Equity Index Portfolio--Continued
 <C>    <S>                                        <C>
 Japan--Continued
  3,000 Fujita Corp.                               $     2
  1,000 Fujita Kanko, Inc.                              10
 11,000 Fujitsu Ltd.                                   184
  4,000 Furukawa Electric Co. Ltd.                      16
  1,000 Gakken Co. Ltd.                                  1
  3,000 Gunma Bank                                      19
  1,000 Gunze Ltd.                                       2
  5,000 Hankyu Corp.                                    21
  1,000 Hankyu Department Stores, Inc.                   7
  3,000 Haseko*                                          2
  2,000 Hazama Corp.                                     2
  2,000 Higo Bank                                        9
    200 Hirose Electric                                 17
 20,000 Hitachi Ltd.                                   147
  6,000 Hitachi Zosen Corp.                              7
  4,000 Hokuriku Bank                                    8
  6,000 Honda Motor Co. Ltd.                           246
  1,000 House Foods Corp.                               15
  1,000 Hoya Corp.                                      51
  1,000 Inax                                             7
 16,000 Industrial Bank of Japan                       113
  1,000 Isetan                                           9
  2,000 Ishihara Sangyo Kaisha*                          4
  2,000 Ito-Yokado Co.                                 119
  8,000 Itochu Corp.                                    18
  1,000 Itoham Foods                                     4
  1,000 Iwataini International Corp.                     2
  1,000 JACCS Co., Ltd.                                  4
 11,000 Japan Airlines                                  34
  6,000 Japan Energy Corp.                               7
  1,000 Japan Metals & Chemicals*                        2
  2,000 Japan Steel Works*                               2
  1,000 JGC Corp.                                        3
  5,000 Joyo Bank                                       20
  2,000 JUSCO Co.                                       38
  6,000 Kajima Corp.                                    18
  1,000 Kaken Pharmaceutical Co.                         6
  2,000 Kamigumi Co. Ltd.                                9
  1,000 Kandenko Co. Ltd.                                6
  4,000 Kanebo Ltd.*                                     6
  2,000 Kaneka Corp.                                    17
  5,800 Kansai Electric Power Co., Inc.                119
  2,000 Kansai Paint                                     6
  4,000 Kao Corp.                                      110
  8,000 Kawasaki Heavy Industries Ltd.                  18
  3,000 Kawasaki Kisen Kaisha Ltd.                       7
 19,000 Kawasaki Steel Corp.                            34
  3,000 Keihin Electric Expesss Railway Co. Ltd.        10
  1,000 Kikkoman Corp.                                   7
  2,000 Kinden Corp.                                    23
 10,000 Kinki Nippon Railway                            50
  6,000 Kirin Brewery Co. Ltd.                          69
  1,000 Kokuyo Co. Ltd.                                 15
</TABLE>
<TABLE>
<CAPTION>
 Shares Description                                    Value
- -------------------------------------------------------------
 <C>    <S>                                           <C>
  6,000 Komatsu Ltd.                                  $    36
    300 Konami Co. Ltd.                                    10
  2,000 Konica Corp.                                        8
  1,000 Koyo Seiko Co.                                      6
  8,000 Kubota Corp.                                       23
  5,000 Kumagai Gumi Co. Ltd.                               5
  2,000 Kurabo Industries                                   2
  2,000 Kurary Co. Ltd.                                    22
  1,000 Kureha Chemical Industry                            2
  1,000 Kurita Water Industries Ltd.                       16
  1,100 Kyocera Corp.                                      58
  3,000 Kyowa Hakko Kogyo                                  16
  2,000 Lion Corp.                                          8
  1,000 Maeda Road Construction Co. Ltd.                    7
  1,000 Makino Milling Machine Co. Ltd.                     7
  1,000 Makita Corp.                                       11
  9,000 Marubeni Corp.                                     19
  2,000 Maruha Corp.                                        2
  2,000 Marui Co. Ltd.                                     30
 12,000 Matsushita Electric Industrial Co. Ltd.           218
  2,000 Meiji Milk Products Co. Ltd.                        6
  2,000 Meiji Seika                                        11
  2,000 Minebea Co. Ltd.                                   20
  1,000 Misawa Homes Co. Ltd.                               4
 12,000 Mitsubishi Chemical Corp.                          34
  9,000 Mitsubishi Corp.                                   55
 13,000 Mitsubishi Electric Corp.                          41
  8,000 Mitsubishi Estate Co. Ltd.                         76
  3,000 Mitsubishi Gas Chemical Co.                         8
 20,000 Mitsubishi Heavy Industries Ltd.                   78
  1,000 Mitsubishi Logistics Corp.                         11
  7,000 Mitsubishi Materials Corp.                         14
  2,000 Mitsubishi Paper Mills                              3
  4,000 Mitsubishi Rayon Co.                               10
  8,000 Mitsubishi Trust & Banking Corp.                   72
  9,000 Mitsui & Co.                                       58
  6,000 Mitsui Engineering & Shipbuilding Co. Ltd.*         7
  5,000 Mitsui Fudosan Co. Ltd.                            42
  5,000 Mitsui Marine & Fire Insurance Co. Ltd.            25
  3,000 Mitsui Mining & Smelting                           14
  7,000 Mitsui O.S.K. Lines Ltd.                           16
  1,000 Mitsui Soko Co. Ltd.                                3
  7,000 Mitsui Trust & Banking Co. Ltd.                    11
  3,000 Mitsukoshi Ltd.                                    11
  1,000 Mori Seiki Co. Ltd.                                12
  1,000 Murata Manufacturing Co. Ltd.                      55
  2,000 Mycal Corp.                                        11
  1,000 Nagase & Co. Ltd.                                   5
  5,000 Nagoya Railroad Co. Ltd.                           17
    300 Namco Ltd.                                          7
  3,000 Nankai Electric Railway                            14
  9,000 NEC Corp.                                         100
  2,000 NGK Insulators Ltd.                                20
  1,000 NGK Spark Plug Co.                                 11
  3,000 Nichido Fire & Marine Insurance                    15
</TABLE>

See accompanying notes to financial statements.

                                       44
<PAGE>

- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 Shares Description                                 Value
- ----------------------------------------------------------
 <C>    <S>                                        <C>
  2,000 Nichirei Corp.                             $     5
  2,000 Niigata Engineering Co. Ltd.*                    2
  2,000 Nikon Corp.                                     26
  1,000 Nippon Beet Sugar Manufacturing Co. Ltd.         2
  1,000 Nippon Comsys Corp.                             15
  6,000 Nippon Express Co. Ltd.                         34
  3,000 Nippon Fire & Marine Insurance                  10
  3,000 Nippon Light Metal Co.                           4
  1,000 Nippon Meat Packers, Inc.                       13
  8,000 Nippon Mitsubishi Oil Co. Ltd.                  32
  6,000 Nippon Paper Industries Co.                     30
  1,000 Nippon Sharyo Ltd.                               3
  3,000 Nippon Sheet Glass Co. Ltd.                     10
  2,000 Nippon Shinpan Co.                               6
  1,000 Nippon Shokubai K.K. Co.                         6
 40,000 Nippon Steel Corp.                              84
  2,000 Nippon Suisan Kaisha Ltd.                        3
     71 Nippon Telegraph & Telephone Corp.             693
  7,000 Nippon Yusen Kabushiki Kaisha                   28
  2,000 Nishimatsu Construction                         11
 15,000 Nissan Motor Co. Ltd.                           66
  1,000 Nisshinbo Industries, Inc.                       4
  1,000 Nissin Food Products                            22
  1,000 Nitto Denko Corp.                               20
 20,000 NKK Corp.                                       16
  1,000 NOF Corp.                                        2
 12,000 Nomura Securities Co. Ltd.                     120
  1,000 Noritake Co. Ltd.                                5
  3,000 NSK Ltd.                                        14
  3,000 NTN Corp.                                        9
  4,000 Obayashi Corp.                                  19
  4,000 Odakyu Electric Railway                         14
  6,000 OJI Paper Co. Ltd.                              35
  1,000 Okamoto Industries Inc.                          2
  1,000 Okuma Corp.                                      4
  1,000 Okumura Corp.                                    4
  2,000 Olympus Optical Co. Ltd.                        25
  2,000 Omron Corp.                                     28
  1,000 Onward Kasiyama Co. Ltd.                        12
  2,000 Orient Corp.                                     6
    400 Orix Corp.                                      32
 15,000 Osaka Gas Co. Ltd.                              49
    200 Oyo Corp.                                        4
  2,000 Penta-Ocean Construction                         3
  1,000 Pioneer Electronic Corp.                        17
  1,000 Q.P. Corp.                                       7
  2,000 Renown, Inc.*                                    3
  1,000 Rohm Co. Ltd.                                  131
 22,000 Sakura Bank Ltd.                                75
  1,000 Sanden Corp.                                     8
  2,000 Sankyo Aluminum Industry Co.                     2
  3,000 Sankyo Co. Ltd.                                 71
  1,000 Sanwa Shutter Corp.                              5
 11,000 Sanyo Electric Co.                              40
</TABLE>
<TABLE>
<CAPTION>
 Shares Description                         Value
- --------------------------------------------------
 <C>    <S>                                 <C>
  2,000 Sapporo Breweries Ltd.              $    9
  2,000 Sato Kogyo                               2
  1,000 Secom Co. Ltd.                          95
    600 Sega Enterprises                        10
  1,000 Seino Transportation Co. Ltd.            6
  1,000 Seiyu Ltd.                               6
  3,000 Sekisui Chemical Co. Ltd.               19
  4,000 Sekisui House Ltd.                      43
  7,000 Sharp Corp.                             78
    300 Shimachu Co., Ltd.                       7
  1,000 Shimano Inc.                            25
  5,000 Shimizu Corp.                           18
  2,000 Shin-Etsu Chemical Co. Ltd.             62
  2,000 Shionogi & Co.                          16
  2,000 Shiseido Co. Ltd.                       30
  5,000 Shizuoka Bank                           52
  7,000 Showa Denko K.K.                         9
  1,000 Skylark Co. Ltd.                        19
    400 SMC Corp.                               37
  2,000 Snow Brand Milk Products                 9
  2,400 Sony Corp.                             226
 19,000 Sumitomo Bank Ltd.                     230
 10,000 Sumitomo Chemicals Co.                  42
  6,000 Sumitomo Corp.                          41
  4,000 Sumitomo Electric Industries            45
  1,000 Sumitomo Forestry Co. Ltd.               8
  3,000 Sumitomo Heavy Industries Ltd.           7
  4,000 Sumitomo Marine & Fire Insurance        26
 21,000 Sumitomo Metal Industries               28
  3,000 Sumitomo Metal Mining Co.               12
  3,000 Sumitomo Osaka Cement Co. Ltd.           5
  5,400 Taiheiyo Cement Corp.                   14
  6,000 Taisei Corp.                            14
  2,000 Taisho Pharmaceutical Co.               64
  1,000 Taiyo Yuden Co. Ltd.                    14
  1,000 Takara Shuzo                             7
  1,000 Takara Standard Co. Ltd.                 7
  2,000 Takashimaya Co. Ltd.                    18
  5,000 Takeda Chemical Industries             222
  5,000 Teijin Ltd.                             19
  2,000 Teikoku Oil Co. Ltd.                     7
  1,000 Toa Corp.                                2
  5,000 Tobu Railway Co.                        14
  1,000 Toei Co. Ltd.                            4
    100 Toho Co.                                14
  3,000 Tohoku Electric Power                   47
 12,000 Tokai Bank                              70
  9,000 Tokio Marine & Fire Insurance Co.       98
  1,000 Tokyo Broadcasting System Inc.          13
  1,000 Tokyo Dome Corp.                         5
  8,000 Tokyo Electric Power Co.               174
  1,000 Tokyo Electron Ltd.                     55
 17,000 Tokyo Gas Co. Ltd.                      43
    900 Tokyo Steel Manufacturing                4
  1,000 Tokyo Style Co. Ltd.                    11
</TABLE>

See accompanying notes to financial statements.

                                       45
<PAGE>

Northern Institutional Funds
Equity Portfolios
- --------------------------------------------------------------------------------
Statements of Investments
May 31, 1999
(All amounts in thousands, except shares)
(Unaudited)
<TABLE>
<CAPTION>
 Shares Description                              Value
- ---------------------------------------------------------------
                International Equity Index Portfolio--Continued
 <C>    <S>                                     <C>
 Japan--Continued
  1,000 Tokyo Tatemono Co. Ltd.                 $     2
  2,000 Tokyotokeiba                                  3
  7,000 Tokyu Corp.                                  18
  4,000 Toppan Printing Co. Ltd.                     45
  8,000 Toray Industries, Inc.                       39
  4,000 Tosoh Corp.                                   8
  1,000 Tostem Corp.                                 19
  2,000 Toto Ltd.                                    15
  1,000 Toyo Engineering Corp.                        1
  1,000 Toyo Seikan Kaisha                           19
  4,000 Toyobo Ltd.                                   6
  2,000 Toyoda Automatic Loom Works                  36
 22,000 Toyota Motor Corp.                          601
    100 Trans Cosmos Inc.                             5
  1,000 Tsubakimoto Chain                             3
  5,000 Ube Industries Ltd.                           9
    400 Uni-Charm Corp.                              17
  3,000 Unitika Ltd.*                                 3
  1,000 Uny Co. Ltd.                                 15
  1,000 Wacoal Corp.                                 11
  1,000 Yamaguchi Bank                                9
  1,000 Yamaha Corp.                                 10
  5,000 Yamaichi Securities Co. Ltd.*                --
  2,000 Yamanouchi Pharmaceutical Co. Ltd.           69
  3,000 Yamato Transport Co. Ltd.                    49
  1,000 Yamazaki Baking Co. Ltd.                     13
  9,000 Yasuda Trust & Banking                       11
  1,000 Yokogawa Electric                             5
                                                -------
                                                 10,256
                                                -------
 Malaysia--0.0%
     67 Aokam Perdana Berhad*                        --
  4,000 Promet Berhad*                               --
    280 Silverstone Berhad*                          --
                                                -------
                                                     --
                                                -------
 Netherlands--5.8%
  8,489 ABN AMRO Holdings N.V.                      189
  3,434 Aegon N.V.                                  278
  1,680 Akzo Nobel                                   70
    233 ASR Verzekeringsgroep N.V.                   16
    452 Buhrmann N.V.                                 8
  3,929 Elsevier N.V.                                50
    531 Getronics N.V.                               20
    613 Hagemeyer N.V                                20
  1,847 Heineken N.V.                               103
    215 Hollandsche Beton Groep N.V.                  3
    154 IHC Caland N.V.                               6
  5,593 ING Groep N.V.                              300
    436 KLM N.V.                                     13
  3,699 Koninklijke Ahold N.V.                      129
  2,170 Koninklijke Philips Electronics N.V.*       187
    250 Koninklijke Hoogovens N.V.                   10
    148 Koninklijke Nedlloyd N.V.                     4
</TABLE>
<TABLE>
<CAPTION>
 Shares Description                           Value
- ----------------------------------------------------
 <C>    <S>                                  <C>
    220 Koninklijke Pakhoed N.V.             $     5
    495 OCE N.V.                                  14
 12,683 Royal Dutch Petroleum Co.                708
  2,798 Royal KPN N.V.                           135
    210 Stork N.V.                                 4
  2,798 TNT Post Group N.V.                       70
  3,366 Unilever N.V.                            224
    563 Vedior N.V.                               10
  1,640 Wolters Kluwer N.V.                       66
                                             -------
                                               2,642
                                             -------
 New Zealand--0.2%
 17,500 Brierley Investments Ltd.                  5
 11,200 Carter Holt Harvey Ltd.                   13
    800 Fisher & Paykel Industries Ltd.            3
  2,279 Fletcher Challenge Building                3
  2,347 Fletcher Challenge Energy                  6
  5,317 Fletcher Challenge Forests                 3
  4,200 Fletcher Challenge Paper                   3
  3,600 Lion Nathan Ltd.                           9
 10,400 Telecom Corp. of New Zealand Ltd.         45
                                             -------
                                                  90
                                             -------
 Norway--0.4%
    400 Aker RGI ASA                               5
    140 Aker RGI ASA, Class B                      2
    300 ASK Proxima ASA*                           2
    300 Bergesen d.y. ASA, Class A                 4
    100 Bergesen d.y. ASA, Class B                 1
  3,300 Christiania Bank Og Kreditkasse           13
  3,800 Den norske Bank ASA                       13
    100 Dyno ASA                                   2
    300 Elkem ASA                                  5
    500 Hafslund ASA, Class A                      3
    200 Hafslund ASA, Class B                      1
    100 Helicopter Services Group ASA              1
    200 Kvaerner ASA                               3
    100 Kvaerner ASA, Class B                      1
    200 Leif Hoegh & Co. ASA                       3
    600 Merkantildata ASA                          6
  1,600 NCL Holdings ASA*                          5
  1,400 Norsk Hydro ASA                           55
    200 Norske Skogindustrier ASA, Class A         7
    900 Orkla ASA, Class A                        14
    200 Orkla ASA, Class B                         3
    500 Petroleum Geo-Services ASA*                8
    300 SAS Norge ASA, Class B                     3
    400 Schibsted ASA                              5
    200 Smedvig, Class A                           2
    100 Smedvig, Class B                           1
  1,600 Storebrand ASA*                           11
    200 Tomra System ASA                           7
    100 Unitor ASA                                 1
                                             -------
                                                 187
                                             -------
</TABLE>

See accompanying notes to financial statements.

                                       46
<PAGE>

- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 Shares Description                                                     Value
- ------------------------------------------------------------------------------
 <C>    <S>                                                            <C>
 Portugal--0.6%
  1,100 Banco Comercial Portugues S.A. (Registered)                    $    30
    700 Banco Espirito Santo e Comercial de Lisboa S.A. (Registered)        17
    400 Banco Totta & Acores S.A. (Registered)                               7
    400 BPI-SGPS S.A. (Registered)                                           9
    300 Brisa-Auto Estradas de Portugal S.A.                                14
    500 Cimpor-Cimentos de Portugal SGPS S.A.                               13
    100 Colep-Companhia Portuguesa de Embalagens*                            1
    100 Companhia de Seguros Tranquilidade (Registered)                      2
    100 Corticeira Amorim S.A.                                               1
    100 EFACEC Capital SGPS S.A.                                             1
  3,500 Electricidade de Portugal S.A.                                      64
    100 Engil-SGPS                                                          --
    100 INAPA Investimentos Participacoes e Gestao S.A.                      1
    600 Jeronimo Martins SGPS S.A.                                          21
    500 Portucel Industral-Empresa Produtora deCelulose S.A.                 3
  1,100 Portugal Telecom S.A. (Registered)                                  50
    180 Soares da Costa (Sociedade de Construcoes)  S.A.                     1
    100 Somague-SGPS S.A.                                                   --
    200 Sonae Investmentos-SGPS S.A.                                         7
    100 UNICER-Uniao Cervejeira S.A.                                         2
                                                                       -------
                                                                           244
                                                                       -------
 Singapore--1.1%
  1,000 Chuan Hup Holdings Ltd.                                              1
  3,000 City Developments Ltd.                                              18
  2,000 Comfort Group Ltd.                                                   1
  1,000 Cycle & Carriage Ltd.                                                6
  3,000 DBS Land Ltd.                                                        5
 10,900 Development Bank of Singapore Ltd.*                                112
  1,000 First Capital Corp. Ltd.                                             1
  1,000 Fraser & Neave Ltd.                                                  4
  2,000 Goldtron Ltd.                                                       --
  2,000 Hai Sun Hup Group Ltd.                                               1
  1,000 Haw Par Brothers International Ltd.                                  2
  1,000 Hotel Properties Ltd.                                                1
  1,000 Inchape Motors Ltd.                                                  2
  6,000 IPC Corp.                                                            1
  2,250 Keppel Corp. Ltd.                                                    6
  2,400 Lum Chang Holdings Ltd.                                              1
  1,000 NatSteel Ltd.                                                        2
  3,000 Neptune Orient Lines Ltd.                                            2
 16,600 Overseas Chinese Banking Corp. Ltd. (Foreign)                      130
  1,000 Overseas Union Enterprise Ltd.                                       3
  1,000 Parkways Holdings Ltd.                                               2
  5,494 Sembcorp Industries Ltd.*                                            7
  1,000 Sembcorp Logistics Ltd.                                              3
 10,000 Singapore Airlines Ltd.                                             89
  1,893 Singapore Press Holdings Ltd.                                       26
 17,000 Singapore Telecommunications Ltd.                                   29
  1,000 Straits Trading Co. Ltd.                                             1
  4,000 United Industrial Corp. Ltd.                                         3
  8,000 United Overseas Bank Ltd. (Foreign)                                 53
  2,000 United Overseas Land Ltd.                                            2
                                                                       -------
                                                                           514
                                                                       -------
</TABLE>
<TABLE>
<CAPTION>
 Shares Description                                                     Value
- ------------------------------------------------------------------------------
 <C>    <S>                                                            <C>
 Spain--3.0%
    375 Acerinox S.A.                                                  $    11
    300 ACS, Actividades de Construccion y Servicios S.A.*                   9
    200 Aguila (El) S.A.*                                                    2
  2,950 Argentaria, Caja Postal y Banco Hipotecario de Espana S.A.          66
  1,450 Autopistas Concesionaria ESP                                        18
    400 Azucarera Ebro Agricolas                                             6
 12,156 Banco Bilbao Vizcaya S.A.                                          176
 10,908 Banco Central Hispanoamericano                                     228
     75 Corporacion Financiera Alba                                         11
    393 Corporacion Mapfre                                                   8
    200 Cortefiel S.A.                                                       5
    150 Empresa Nacional de Celulosas S.A.                                   3
  5,700 Endesa S.A.                                                        122
    900 Ercros S.A.*                                                         1
    200 Fabrica Espanola de Productos Quimicos y  Farmaceuticos S.A.         3
    375 Fomenta de Construcciones y Contratas S.A.                          22
    925 Gas Natural SDG S.A., Class E                                       72
    340 Grupo Dragados S.A.*                                                12
  5,344 Iberdrola S.A.                                                      77
    250 Inmobiliaria Urbis S.A.*                                             3
    300 Metrovacesa S.A.                                                     7
    125 Portland Valderrivas S.A.                                            4
    400 Prosegur CIA de Seguridad S.A. (Registered)                          4
  5,100 Puleva S.A.*                                                         3
    630 Reno de Medici S.p.A.*                                               2
  5,325 Repsol S.A.                                                         97
    275 Sociedade General de Aguas de Barcelona S.A.                        15
    200 SOL Melia S.A.                                                       8
  1,075 Tabacalera S.A., Class A                                            21
  6,197 Telefonica de Espana                                               298
  1,300 Telepizza S.A.*                                                      8
  1,805 Union Electrica Fenosa S.A.                                         24
    350 Uralita S.A.                                                         3
    725 Vallehermoso S.A.                                                    7
    300 Viscofan Industria Navarra de Envolturas  Celulosicas S.A.           4
    350 Zardoya Otis S.A.                                                    9
                                                                       -------
                                                                         1,369
                                                                       -------
 Sweden--3.1%
  3,900 ABB AB, Class A                                                     53
  1,600 ABB AB, Class B                                                     22
    800 AGA AB, Class A                                                     10
    700 AGA AB, Class B                                                      9
  9,820 AstraZeneca PLC                                                    387
    400 Atlas Copco AB, Class A                                             10
    700 Atlas Copco AB, Class B                                             18
    312 Boliden Ltd. SDR*                                                    1
    400 Diligentia AB                                                        3
    700 Drott AB, Class B                                                    6
  2,140 Electrolux AB, Class B                                              42
    100 Esselte AB, Class A                                                  2
</TABLE>

See accompanying notes to financial statements.

                                       47
<PAGE>

Northern Institutional Funds
Equity Portfolios
- --------------------------------------------------------------------------------
Statements of Investments
May 31, 1999
(All amounts in thousands, except shares)
(Unaudited)
<TABLE>
<CAPTION>
 Shares Description                                                     Value
- ------------------------------------------------------------------------------
                International Equity Index Portfolio--Continued
 <C>    <S>                                                            <C>
 Sweden--Continued
    100 Esselte AB, Class B                                            $     2
  2,100 ForeningsSparbanken AB                                              43
    192 Granges AB                                                           3
  4,800 Hennes & Mauritz AB, Class B                                       108
    600 Netcom AB, Class B*                                                 18
    500 Om Gruppen AB                                                        6
  1,100 Sandvik AB, Class A                                                 24
    400 Sandvik AB, Class B                                                  9
  1,900 Securitas AB, Class B                                               27
  3,005 Skandia Forsakrings AB                                              52
  3,500 Skandinaviska Enskilda Banken, Class A                              42
    700 Skanska AB, Class B                                                 24
    300 SKF AB, Class A                                                      5
    411 SKF AB, Class B                                                      6
  1,200 Svenska Cellulosa AB, Class B                                       28
  1,300 Svenska Handelsbanken, Class A                                      47
    100 Svenska Handelsbanken, Class B                                       3
    500 Svenskt Stal AB, Class A                                             6
    200 Svenskt Stal AB, Class B                                             2
  2,500 Swedish Match AB                                                     9
 11,500 Telefonaktiebolaget LM Ericsson, Class B                           308
    800 Trelleborg AB, Class B                                               7
    800 Volvo AB, Class A                                                   20
  1,800 Volvo AB, Class B                                                   46
    400 Wm-Data AB, Class B                                                 14
                                                                       -------
                                                                         1,422
                                                                       -------
 Switzerland--6.8%
     35 ABB A.G. (Bearer)*                                                  10
     45 ABB A.G. (Registered)                                               64
    100 Adecco S.A.                                                         52
     40 Alusuisse-Lonza Holdings A.G. (Registered)                          47
  1,585 Credit Suisse Group (Registered)                                   276
     10 Forbo Holding A.G.                                                   4
     15 Georg Fischer A.G. (Registered)                                      5
     30 Holderbank Financiere Glarus A.G., (Bearer)                         36
     60 Holderbank Financiere Glarus A.G. (Registered)                      19
     10 Jelmoli S.A.                                                         2
      2 Kuoni Reisen A.G., Category B (Registered)                           8
     10 Moevenpick Holding                                                   4
    230 Nestle S.A. (Registered)                                           414
    410 Novartis A.G. (Registered)                                         596
     10 Roche Holdings A.G. (Bearer)                                       174
     42 Roche Holdings A.G. (Genusss)                                      445
     75 SAirGroup (Registered)                                              17
     85 Schweizerische Reuckversicherungs-Gesellschaft  (Registered)       162
      5 SGS Societe Generale de Surveillance Holdings  S.A (Bearer)          5
     20 SGS Societe Generale de Surveillance Holdings  S.A                   5
        (Registered)
     10 Sika Finanz A.G.                                                     3
     20 Sulzer A.G. (Registered)                                            12
</TABLE>
<TABLE>
<CAPTION>
 Shares Description                           Value
- ----------------------------------------------------
 <C>    <S>                                  <C>
     20 Swatch Group A.G. (Bearer)           $    13
    100 Swatch Group A.G. (Registered)            15
    430 Swisscom A.G.                            155
  1,269 UBS (Registered)                         368
     25 Valora Holding A.G.                        6
    280 Zurich Allied A.G.                       165
                                             -------
                                               3,082
                                             -------
 United Kingdom--21.4%
  8,000 Abbey National PLC                       165
  9,205 Allied Zurich PLC*                       117
  1,031 AMEC PLC                                   4
    439 Amstrad PLC                               --
  1,929 Anglian Water PLC                         21
  2,067 Anglian Water PLC, Class B                 2
  5,000 Arjo Wiggins Appleton PLC                 14
  4,400 Associated British Foods PLC              33
  6,000 AstraZeneca PLC                          239
  6,000 BAA PLC                                   64
  8,859 Barclays PLC                             269
  1,000 Barratt Developments PLC                   5
  4,604 Bass PLC                                  68
  2,089 BBA Group PLC                             15
  1,000 Berkeley Group PLC                        11
 23,294 BG PLC                                   128
  2,113 BICC PLC                                   3
  4,219 Blue Circle Industries PLC                26
  3,037 BOC Group PLC                             52
  5,280 Boots Co. PLC                             69
  1,024 Bowthorpe PLC                              8
 56,513 BP Amoco PLC                           1,012
  3,000 BPB PLC                                   14
 10,177 British Aerospace PLC                     67
  6,120 British Airways PLC                       44
  9,205 British American Tobacco PLC              84
  3,035 British Land Co. PLC                      27
 10,000 British Sky Broadcasting Group PLC        95
 11,000 British Steel PLC                         23
 37,132 British Telecommunications PLC           619
  3,000 Bunzl PLC                                 14
    833 Burmah Castrol PLC                        14
 14,066 Cable & Wireless PLC                     174
 11,870 Cadbury Schweppes PLC                     81
  2,900 Caradon PLC                                7
  3,097 Carlton Communications PLC                25
 23,400 Centrica PLC*                             47
  7,305 CGU PLC                                  107
  5,000 Coats Viyella PLC                          3
  1,000 Cobham PLC                                15
  5,872 Coca-Cola Beverages PLC*                  11
  4,000 Compass Group PLC                         41
  1,000 Courtaulds Textiles PLC                    2
  1,000 De La Rue PLC                              5
  1,000 Delta PLC                                  2
 21,190 Diageo PLC                               223
  2,000 Electrocomponents PLC                     16
</TABLE>

See accompanying notes to financial statements.

                                       48
<PAGE>

- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 Shares Description                                   Value
- ------------------------------------------------------------
 <C>    <S>                                          <C>
  2,146 Elementis PLC                                $     3
  4,137 EMI Group PLC                                     29
  3,000 FKI PLC                                            9
 15,740 General Electric Co. PLC                         149
  4,646 GKN PLC                                           78
 21,257 Glaxo Wellcome PLC                               597
  5,132 Granada Group PLC                                105
  2,000 Great Portland Estates PLC                         7
  6,000 Great Universal Stores PLC                        64
 14,300 Halifax PLC                                      185
  2,040 Hammerson PLC                                     15
  4,000 Hanson PLC                                        36
  1,000 Hepworth PLC                                       3
 10,436 HSBC Holdings PLC                                349
  5,208 HSBC Holdings PLC (75P)                          174
  1,020 Hyder PLC                                         12
  2,000 IMI PLC                                            8
  4,000 Imperial Chemical Industries PLC                  44
 22,104 Invensys PLC                                     101
  1,000 Jarvis PLC                                         8
  1,000 Johnson Matthey PLC                                9
  8,176 Kingfisher PLC                                   103
  7,226 Ladbroke Group PLC                                32
  1,000 Laird Group PLC                                    4
  3,210 Land Securities Group PLC                         46
  6,000 LASMO PLC                                         13
 28,000 Legal & General Group PLC                         82
  1,000 Lex Service PLC                                    9
 31,723 Lloyds TSB Group PLC                             419
  1,313 Lonmin PLC                                        11
 16,556 Marks & Spencer PLC                              105
  2,251 MEPC PLC                                          18
  1,000 Meyer International PLC                            7
  3,008 Misys PLC                                         25
  8,050 National Grid Group PLC                           55
  7,302 National Power PLC                                57
  2,000 Next PLC                                          23
    911 Ocean Group PLC                                   14
  3,666 Peninsular & Oriental Steam Navigation Co.        54
  3,505 Pearson PLC                                       67
  6,939 Pilkington PLC                                     8
  1,929 Provident Financial PLC                           29
 11,000 Prudential Corp. PLC                             145
  2,000 Racal Electronics PLC                             12
  3,016 Railtrack Group PLC                               62
  4,215 Rank Group PLC                                    15
  6,832 Reed International PLC                            50
 17,000 Rentokil Initial PLC                              69
  8,400 Reuters Holdings PLC                             116
  2,472 Rexam PLC                                         10
  1,437 Rexam PLC, Class B*                                2
  6,298 Rio Tinto PLC (Registered)                        92
  2,000 RMC Group PLC                                     27
  8,133 Rolls-Royce PLC                                   34
  8,410 Royal & Sun Alliance Insurance Group PLC          69
</TABLE>
<TABLE>
<CAPTION>
 Shares Description                                  Value
- -----------------------------------------------------------
 <C>    <S>                                         <C>
  5,156 Royal Bank Scotland Group PLC               $   110
  4,000 Rugby Group PLC                                   7
  6,354 Safeway PLC                                      26
 11,033 Sainsbury (J) PLC                                67
  1,500 Schroders PLC                                    31
  4,000 Scottish & Newcastle PLC                         46
  7,000 Scottish Power PLC                               60
  5,000 Scottish & Southern Energy PLC                   47
    993 Selfridges PLC                                    4
  2,000 Slough Estates PLC                               12
 32,327 SmithKline Beecham PLC                          422
  2,036 Smiths Industries PLC                            30
  2,000 St. James Place Capital PLC                       8
  8,024 Stagecoach Holdings PLC                          26
  1,406 Sun Life & Provintial Holdings                   11
  5,583 Tarmac PLC                                       11
  3,000 Tate & Lyle PLC                                  20
  2,046 Taylor Woodrow PLC                                6
 38,253 Tesco PLC                                       111
  1,860 Thames Water PLC                                 30
  2,000 Thames Water PLC, Class B*                        2
  3,000 TI Group PLC                                     23
    565 Transport Development Group PLC                   2
  1,000 Transport Development Group PLC, Class B*         1
  1,389 Unigate PLC                                       9
 16,846 Unilever PLC                                    148
  3,642 United Biscuits Holdings PLC                     12
  3,000 United Biscuits Holdings PLC, Class B*           36
  1,333 Vickers PLC                                       3
  1,000 Viglen Technology PLC                             0
 18,257 Vodafone Group PLC                              348
  4,307 Williams PLC                                     25
  1,000 Wilson (Connolly) Holdings PLC                    2
  2,000 Wimpey (George) PLC                               5
  3,093 Wolseley PLC                                     24
                                                    -------
                                                      9,679
- -----------------------------------------------------------
 TOTAL COMMON STOCKS (Cost $40,377)                 $44,047
- -----------------------------------------------------------
 PREFERRED STOCKS--0.5%
 Australia--0.2%
  9,703 News Corp. Ltd.                             $    74
                                                    -------
 Austria--0.0%
     12 Bau Holdings A.G.--Vorzug                        --
      4 Generali Holding Vienna A.G.--Vorzug              1
                                                    -------
                                                          1
                                                    -------
 France--0.0%
    100 Etablissements Econonmiques du Casino
        Guichard-Perrachon S.A.                           6
                                                    -------
</TABLE>

See accompanying notes to financial statements.

                                       49
<PAGE>

Northern Institutional Funds
Equity Portfolios
- --------------------------------------------------------------------------------
Statements of Investments
May 31, 1999
(All amounts in thousands, except shares and number of contracts)
(Unaudited)
<TABLE>
<CAPTION>
 Shares Description                                           Value
- --------------------------------------------------------------------
                International Equity Index Portfolio--Continued
 <C>    <S>                                                  <C>
 Germany--0.3%
     50 Axa Colonia Konzern A.G.--Non Voting                 $     4
    500 MAN A.G.--Vorzug                                          10
    100 Metro A.G.--Vorzug                                         3
    100 Rheinmetall A.G.                                           2
    450 RWE A.G.--Non Voting                                      13
    250 SAP A.G.--Vorzug                                         100
    500 Volkswagen A.G.--Non Voting                               18
                                                             -------
                                                                 150
                                                             -------
 Italy--0.0%
  6,300 Fiat S.p.A.                                               10
                                                             -------
 United Kingdom--0.0%
  2,726 MEPC PLC, Class B                                          4
- --------------------------------------------------------------------
 TOTAL PREFERRED STOCKS (Cost $205)                          $   245
- --------------------------------------------------------------------
 WARRANTS/RIGHTS--0.0%
 Belgium--0.0%
    100 Gevaert N.V., Exp 10/9/00*                           $    --
                                                             -------
 France--0.0%
     27 Assurances Generales de France S.A.,  Exp 6/15/00*        --
    300 Vivendi, Exp 5/2/01*                                       1
  2,760 Vivendi, Exp 6/7/99*                                       3
                                                             -------
                                                                   4
                                                             -------
 Hong Kong--0.0%
  1,200 Chinese Estates Holdings, Exp 11/24/99*                   --
  1,200 Chinese Estates Holdings, Exp 11/24/00*                   --
  1,260 Hong Kong & China Gas Co. Ltd., Exp  9/30/99*             --
    600 Hong Kong Construction, Exp 12/31/99*                     --
    750 Wharf Holdings Ltd., Exp 12/31/99*                         1
                                                             -------
                                                                   1
                                                             -------
 Norway--0.0%
    200 Kvaerner ASA, Class A, Exp 6/9/99*                        --
    100 Kvaerner ASA, Class B, Exp 6/9/99*                        --
                                                             -------
                                                                  --
                                                             -------
 Portugal--0.0%
    400 BPI-SGPS S.A. (Registered), Exp 6/19/99*                   2
    100 EFACEC Capital SGPS S.A., Exp 6/14/99*                     1
                                                             -------
                                                                   3
- --------------------------------------------------------------------
 TOTAL WARRANTS/RIGHTS (Cost $0)                             $     8
- --------------------------------------------------------------------
 OTHER--0.7%
 Australia--0.2%
  7,000 World Equity Benchmark Shares                        $    73
         (WEBS) Index Series--Australia
                                                             -------
 Germany--0.4%
  9,000 WEBS Index Series--Germany                               181
                                                             -------
</TABLE>
<TABLE>
<CAPTION>
 Shares Description                   Value
- --------------------------------------------
 <C>    <S>                          <C>
 Spain--0.1%
  1,600 WEBS Index Series--Spain     $    43
- --------------------------------------------
 TOTAL OTHER (Cost $322)             $   297
- --------------------------------------------
 SHORT-TERM INVESTMENTS--0.2%
        CDC Marches, Paris, France
    $82   4.875% Due 6/1/99          $    82
        U.S. Treasury Bill #
     20   4.428% Due 6/24/99              20
</TABLE>
<TABLE>
- -----------------------------
<S>              <C>  <C>
TOTAL SHORT-TERM      $   102
INVESTMENTS (Cost
$102)
- -----------------------------
TOTAL INVESTMENTS--
98.6%
 (Cost $41,006)       $44,699
- -----------------------------
Other assets, less        628
liabilities--1.4%
- -----------------------------
NET ASSETS--100.0%    $45,327
- -----------------------------
</TABLE>
OPEN FUTURES CONTRACTS:
<TABLE>
<CAPTION>
               Number of       Contract       Contract        Contract        Unrealized
Type           Contracts        Amount        Position       Expiration          Loss
- ----------------------------------------------------------------------------------------
<S>            <C>             <C>            <C>            <C>              <C>
Nikkei 225        3              $239           Long          6/11/99            ($15)
- ----------------------------------------------------------------------------------------
</TABLE>

*Non-income producing security.

#Security pledged to cover margin requirements for open futures contracts

At May 31, 1999 the Portfolio's investments, excluding
short-term investments, were diversified as follows:

<TABLE>
<S>                     <C>
Industry/Sector
- ------------------------------
Banks                    14.9%
Business Services        10.3
Capital Goods             5.6
Consumer Durables         6.7
Consumer Non-durables     6.3
Consumer Services         3.9
Energy/Utilities          6.3
Financial Services       10.3
Pharmaceuticals/Health    7.6
Multi-Industry            2.5
Raw Materials             6.4
Retail                    3.9
Technology                4.6
Transportation            2.6
Utilities                 8.1
- ------------------------------
Total                   100.0%
- ------------------------------
</TABLE>

See accompanying notes to financial statements.

                                       50
<PAGE>

- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
  Shares   Description                                      Value
- -------------------------------------------------------------------
                         International Growth Portfolio
 <C>       <S>                                             <C>
 COMMON STOCKS--92.5%
 Australia--2.2%
   185,000 Broken Hill Proprietary Co. Ltd.                $  1,902
    20,000 News Corp. Ltd. ADR                                  664
                                                           --------
                                                              2,566
                                                           --------
 Austria--1.3%
    18,000 VA Technologies A.G.                               1,515
                                                           --------
 China--1.3%
   500,000 Beijing Enterprises Holdings Ltd.                    812
 2,400,000 Huaneng Power International, Inc., H Shares          712
                                                           --------
                                                              1,524
                                                           --------
 Finland--1.2%
    70,000 Stora Enso Oyj, R Shares                             716
    24,000 Upm-Kymmene Oyj                                      705
                                                           --------
                                                              1,421
                                                           --------
 France--9.4%
    10,000 Axa--UAP                                           1,155
     4,000 Canal Plus                                         1,161
     4,000 Cap Gemini S.A.                                      578
     9,000 Elf Aquitaine S.A.                                 1,306
    15,500 Lafarge S.A.                                       1,400
     5,000 LVMH Moet-Hennessy Louis Vuitton                   1,396
     6,500 Societe Generale, A Shares                         1,184
     7,500 Suez Lyonnaise des Eaux                            1,246
    18,000 Vivendi                                            1,336
                                                           --------
                                                             10,762
                                                           --------
 Germany--10.5%
    14,000 Adidas-Salomon A.G.                                1,398
    30,000 BASF A.G.                                          1,170
     2,000 Bayerische Motoren Werke A.G.                      1,284
    14,000 DaimlerChrysler A.G.                               1,224
    20,000 Deutsche Bank A.G.                                 1,046
    30,000 Hoechst A.G.                                       1,339
     9,000 Mannesmann A.G.                                    1,233
    12,000 SGL Carbon A.G.                                      841
    18,000 Siemens A.G.                                       1,214
    19,000 Volkswagen A.G.                                    1,180
                                                           --------
                                                             11,929
                                                           --------
 Greece--0.8%
    40,000 Hellenic Telecommunications Organization S.A.        868
                                                           --------
 India--0.6%
    80,000 Mahanagar Telephone Nigam Ltd. GDR                   730
                                                           --------
 Ireland--0.6%
    12,500 Elan Corp. PLC ADR*                                  675
                                                           --------
 Italy--3.5%
    38,000 Assicurazioni Generali                             1,355
    92,000 Bulgari S.p.A.                                       555
   320,000 ENI S.p.A.                                         2,004
                                                           --------
                                                              3,914
                                                           --------
</TABLE>
<TABLE>
<CAPTION>
 Shares  Description                               Value
- ----------------------------------------------------------
 <C>     <S>                                      <C>
 Japan--21.0%
  82,000 Fujitsu Ltd.                             $  1,373
  65,000 Isetan Co. Ltd.                               581
  30,000 Jafco Co. Ltd.                              1,207
  40,000 JUSCO Co. Ltd.                                758
 825,000 Kawasaki Steel Corp.                        1,475
   8,000 Keyence Corp.                               1,159
  40,000 Kissei Pharmaceutical Co. Ltd.                844
 180,000 Mazda Motor Corp.                             853
 180,000 Mitsui & Co. Ltd.                           1,152
 300,000 Nikko Securities Co. Ltd.                   1,311
  55,000 Nikon Corp.                                   724
 240,000 Oji Paper Co. Ltd.                          1,391
 120,000 Omron Corp.                                 1,659
  55,000 Onward Kasiyama Co. Ltd.                      637
  40,000 Ricoh Co. Ltd.                                444
  50,000 Sankyo Co. Ltd.                             1,171
  95,000 Sanwa Bank                                    923
  50,000 SHIMANO, Inc.                               1,233
   8,000 Sony Corp. ADR                                747
  75,000 Sumitomo Bank Ltd.                            908
 120,000 Sumitomo Electric Industries                1,345
  75,000 Takashimaya Co. Ltd.                          683
 150,000 Tokyo Gas Co. Ltd.                            381
 160,000 Toshiba Corp.                                 989
                                                  --------
                                                    23,948
                                                  --------
 Netherlands--5.4%
  14,000 ASM Lithography Holding N.V. ADR              618
  67,000 Buhrmann N.V.                               1,121
   7,000 Equant N.V. ADR*                              581
  27,000 ING Groep N.V.                              1,447
  20,214 Unilever N.V. ADR                           1,320
  55,000 Vedior N.V.                                 1,021
                                                  --------
                                                     6,108
                                                  --------
 Norway--1.2%
 380,000 Den Norske Bank A.S.A.                      1,315
                                                  --------
 Philippines--0.7%
  30,000 Philippine Long Distance Telephone Co.        844
                                                  --------
 Portugal--1.0%
  26,000 Portugal Telecom S.A.                       1,180
                                                  --------
 South Korea--1.2%
     368 Daewoo Corp.                                    2
  50,000 Korea Electric Power Corp. ADR                853
  15,000 Korea Telecom Corp. ADR*                      477
                                                  --------
                                                     1,332
                                                  --------
 Spain--2.8%
  65,000 Argentaria S.A.                             1,461
  35,000 Telefonica de Espana                        1,683
                                                  --------
                                                     3,144
                                                  --------
 Sweden--0.6%
  25,000 Telefonaktiebolaget LM Ericsson ADR           673
                                                  --------
</TABLE>

See accompanying notes to financial statements.

                                       51
<PAGE>

Northern Institutional Funds
Equity Portfolios
- -------------------------------------------------------------------------------
Statements of Investments
May 31, 1999
(All amounts in thousands, except shares)
(Unaudited)
<TABLE>
<CAPTION>
  Shares/
 Principal
  Amount   Description                                 Value
- --------------------------------------------------------------
                   International Growth Portfolio--Continued
 <C>       <S>                                        <C>
 Switzerland--5.3%
    1,200  ABB A.G. Bearer                            $  1,704
    1,200  Novartis A.G.                                 1,745
    4,000  Swisscom A.G. *                               1,444
    4,100  UBS A.G.                                      1,189
                                                      --------
                                                         6,082
                                                      --------
 Thailand--0.7%
  155,000  BEC World Public Co. Ltd.                       835
                                                      --------
 United Kingdom--21.2%
  110,000  Allied Zurich PLC*                            1,403
   50,000  Barclays PLC                                  1,517
  100,000  Bass PLC                                      1,476
   11,000  BP Amoco PLC ADR                              1,178
   95,000  British Land Co. PLC                            837
  100,000  British Sky Broadcasting Group PLC              950
  140,000  Canary Wharf Finance PLC*                       875
   16,000  Glaxo Wellcome PLC ADR                          900
  120,000  Great Universal Stores PLC                    1,281
  120,000  Halifax PLC                                   1,550
   37,000  HSBC Holdings PLC                             1,237
   85,000  Imperial Chemical Industries PLC                937
  255,000  Invensys PLC                                  1,162
  200,000  Marks & Spencer PLC                           1,263
   32,000  Pearson PLC                                     610
   60,000  Rio Tinto PLC                                   880
  140,909  Royal & Sun Alliance Insurance Group PLC      1,153
  145,000  Scottish & Newcastle PLC                      1,683
  205,000  Shell Transport & Trading Co.                 1,484
  235,000  TI Group PLC                                  1,811
                                                      --------
                                                        24,187
- --------------------------------------------------------------
 TOTAL COMMON STOCKS (Cost $99,511)                   $105,552
- --------------------------------------------------------------
 RIGHTS--0.0%
  (Cost $0)
   18,000  Vivendi, Exp. 6/7/99*                      $     19
- --------------------------------------------------------------
 SHORT-TERM INVESTMENT--3.8%
  (Cost $4,341)
           CDC Marches, Paris, France
 $  4,341    4.875% Due 6/1/99                        $  4,341
- --------------------------------------------------------------
 TOTAL INVESTMENTS--96.3%
  (Cost $103,852)                                     $109,912
- --------------------------------------------------------------
 Other assets, less liabilities--3.7%                    4,221
- --------------------------------------------------------------
 NET ASSETS--100.0%                                   $114,133
- --------------------------------------------------------------
- --------------------------------------------------------------
</TABLE>

At May 31, 1999, the Portfolio's investments, excluding the short-term
investment, were diversified as follows:

<TABLE>
<CAPTION>
Industry/Sector
- --------------------------
<S>                 <C>
Auto                  2.7%
Basic Materials      12.2
Building              1.2
Capital Goods         9.9
Chemicals             1.2
Consumer Goods       10.0
Financial Services   16.5
Food/Beverages        2.7
Insurance             1.2
Media                 2.3
Oil                   3.9
Other                 9.6
Pharmaceuticals       2.2
Real Estate           1.5
Retail                5.2
Technology            8.1
Telecommunications    4.9
Transportation        1.8
Utilities             2.9
- --------------------------
                    100.0%
- --------------------------
</TABLE>

*Non-income producing security.

See accompanying notes to financial statements.

                                      52
<PAGE>

- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 Shares Description                             Value
- -------------------------------------------------------
                         Small Company Index Portfolio
 <C>    <S>                                    <C>
 COMMON STOCKS--95.2%
 Advertising--0.4%
  4,125 Advo, Inc.*                            $     82
  3,400 Catalina Marketing Corp.*                   301
  4,100 Getty Images, Inc.*                          90
    100 Grey Advertising, Inc.                       30
  7,150 Ha-Lo Industries, Inc.*                      86
  7,100 Sitel Corp.*                                 20
  2,200 TMP Worldwide, Inc.*                        107
                                               --------
                                                    716
                                               --------
 Aerospace & Defense--0.6%
  5,100 AAR Corp.                                   101
  1,600 Alliant Techsystems, Inc.*                  136
  4,500 BE Aerospace, Inc.                           80
    900 Curtiss-Wright Corp.                         34
  1,550 Ducommun, Inc.*                              18
  3,640 Fairchild Corp. (The)*                       54
  6,400 GenCorp, Inc.                               156
  1,100 Heico Corp.*                                 28
  4,300 Kaman Corp.                                  57
  2,200 Kellstrom Inds, Inc.*                        40
  1,200 L-3 Communications Holdings, Inc.*           59
  2,150 Nichols Research Corp.*                      44
  1,700 Primex Technologies, Inc.                    32
  3,700 Remec, Inc.*                                 48
  1,100 Sequa Corp.*                                 64
                                               --------
                                                    951
                                               --------
 Agriculture--0.1%
  7,800 Agribiotech, Inc.*                           50
  2,000 Agribrands International, Inc.*              70
  6,400 Cadiz, Inc.*                                 66
  1,700 Tejon Ranch Co.*                             45
                                               --------
                                                    231
                                               --------
 Airlines--0.4%
 10,400 Airtran Holdings, Inc.*                      49
  4,900 Alaska Airgroup, Inc.*                      203
  7,730 America West Holding Corp., Class B*        151
    600 Amtran, Inc.*                                14
  2,400 Atlantic Coast Airlines Holdings*            42
  4,700 Mesa Air Group, Inc.*                        31
  2,250 Mesaba Holdings, Inc.*                       33
  2,625 Midwest Express Holdings*                    79
  3,800 Skywest, Inc.                                88
 10,700 Trans World Airlines*                        55
                                               --------
                                                    745
                                               --------
 Apparel--0.8%
  3,500 Authentic Fitness Corp.*                     57
 10,600 Burlington Industries, Inc.                 104
  1,100 Columbia Sportswear Co.*                     16
  4,100 Cone Mills Corp.*                            25
  2,400 Donna Karan International, Inc.*             25
</TABLE>
<TABLE>
<CAPTION>
 Shares Description                                Value
- ----------------------------------------------------------
 <C>    <S>                                       <C>
  2,200 Galey & Lord, Inc.*                       $      9
  1,400 Guess ?, Inc.*                                  15
  4,900 Hartmarx Corp.*                                 24
  4,150 Kellwood Co.                                    99
  6,200 Nautica Enterprises, Inc.*                     100
  4,400 Nine West Group, Inc.*                         122
  2,300 Oshkosh B'gosh, Inc.                            45
  1,200 Oxford Industries, Inc.                         33
  4,300 Phillips-Van Heusen Corp.                       38
  3,850 Quiksilver, Inc.*                              110
  5,500 Russell Corp.                                  129
  3,100 St John Knits, Inc.                             89
  8,600 Stride Rite Corp.                               90
  1,000 Timberland Co.*                                 65
  7,600 Wolverine World Wide, Inc.*                    103
                                                  --------
                                                     1,298
                                                  --------
 Auto Manufacturers--0.0%
  4,300 Wabash National Corp.                           82
                                                  --------
 Auto Parts & Equipment--0.8%
  3,800 Aftermarket Technology Corp.*                   42
  4,500 Arvin Industries, Inc.                         177
  2,400 Bandag, Inc.                                    83
  4,463 Borg-Warner Automotive, Inc.*                  247
  3,000 Breed Technologies, Inc.*                       10
  4,000 Delco Remy International, Inc.*                 44
  1,600 Detroit Diesel Corp.*                           40
  3,200 Exide Corp.*                                    50
  3,400 Hayes Lemmerz International, Inc.*             112
  7,400 Miller Industries, Inc.*                        36
  3,100 OEA, Inc.*                                      31
  3,100 Simpson Industries                              31
  1,900 Standard Motor Products, Inc.                   45
  3,025 Standard Products Co.                           67
  3,800 Superior Industries International, Inc.         95
  3,125 Titan International, Inc.*                      29
  8,600 Tower Automotive, Inc.*                        197
  2,643 Wynn's International, Inc.                      48
                                                  --------
                                                     1,384
                                                  --------
 Banks--6.0%
  1,400 Alabama National BanCorp.                       34
  5,250 Amcore Financial, Inc.                         111
  1,900 Area Bancshares Corp.                           47
    900 Bancfirst Corp.                                 29
  1,300 Bancfirst Ohio Corp.                            32
 10,400 BancorpSouth, Inc.                             177
  4,100 Bancwest Corp.                                 156
  2,127 Bank of Granite Corp.                           51
  4,280 Banknorth Group, Inc.                          114
  2,014 BOK Financial Corp.                             51
  2,470 Brenton Banks, Inc.                             43
  1,300 BSB BanCorp, Inc.                               33
  2,460 BT Financial Corp.                              66
    700 Capital City Bank Group, Inc.                   16
  4,200 Carolina First Corp.                           115
</TABLE>

See accompanying notes to financial statements.

                                       53
<PAGE>

Northern Institutional Funds
Equity Portfolios
- --------------------------------------------------------------------------------
Statements of Investments
May 31, 1999
(All amounts in thousands, except shares)
(Unaudited)
<TABLE>
<CAPTION>
 Shares Description                        Value
- ------------------------------------------------------------
                    Small Company Index Portfolio--Continued
 <C>    <S>                                <C>
 Banks--Continued
 1,300  Cathay BanCorp, Inc.               $  46
 3,163  Centennial BanCorp.*                  37
 1,700  Century South Banks, Inc.             40
 2,528  Chemical Financial Corp.              78
 2,608  Chittenden Corp.                      76
 4,450  Citizens Banking Corp.               132
 3,122  City Holding Co.                      85
 5,876  CNB Bancshares, Inc.                 253
 2,005  Columbia Banking Systems, Inc.*       33
 4,856  Commerce BanCorp., Inc.              195
 1,400  Community Bank System, Inc.           33
 8,800  Community First Bankshares, Inc.     186
 2,083  Community Trust BanCorp.              48
 1,500  Corus Bankshares, Inc.                48
 4,980  Cullen/Frost Bankers, Inc.           280
 1,995  CVB Financial Corp.                   47
 1,240  F & M BanCorp.                        40
 2,906  F & M BanCorp., Inc.                 107
 4,155  F & M National Corp.                 124
 3,534  F.N.B. Corp.                          95
 1,200  Farmers Capital Bank Corp.            41
 4,450  First BanCorp. of Puerto Rico        107
 3,100  First Charter Corp.                   75
 1,100  First Citizens Bancshares, Inc.       91
 2,200  First Commerce Bancshares, Inc.       59
 5,800  First Commonwealth Financial Co.     130
 5,367  First Financial BanCorp.             127
 1,889  First Financial Bankshares, Inc.      59
 1,152  First Financial Corp.                 43
 1,900  First Merchants Corp.                 45
 4,713  First Midwest BanCorp., Inc.         183
 1,800  First Republic Bank Corp.*            47
 2,141  First Source Corp.                    69
 4,000  First United Bancshares, Inc.         62
 2,032  First Western BanCorp.                71
 2,600  Frontier Financial Corp.*             63
 2,500  GBC BanCorp.                          46
 1,600  Gold Banc Corp., Inc.*                22
 2,770  Grand Premier Financial, Inc.         33
 1,800  Greater Bay BanCorp.                  58
 1,500  Hamilton BanCorp., Inc.*              34
 1,710  Hancock Holding Co.                   76
 1,368  Harleysville National Corp.           48
 7,412  Hudson United BanCorp.               227
 6,527  Imperial BanCorp.*                   126
 2,200  Independent Bank Corp.                31
 2,000  International Bancshares Corp.        94
 2,550  Interwest BanCorp., Inc.              52
 2,500  Investors Financial Services Co.      88
 2,200  Irwin Financial Corp.                 51
 1,433  Jeffbanks, Inc.                       37
 1,200  Mahoning National BanCorp.            37
 1,400  Merchants New York BanCorp.           48
</TABLE>
<TABLE>
<CAPTION>
 Shares Description                                Value
- ---------------------------------------------------------
 <C>    <S>                                       <C>
   600  Michigan Financial Corp.                  $    19
 1,470  Mid-America BanCorp.                           36
 1,200  Mississippi Valley Bancshares, Inc.            39
 2,282  N B T BanCorp., Inc.                           48
 2,900  National BanCorp of Alaska                     80
 1,000  National City BanCorp.*                        20
 3,169  National City Bancshares                       80
 3,185  National Penn Bancshares, Inc.                 73
 8,039  Old National BanCorp.                         279
 1,700  Omega Financial Corp.                          60
 6,431  One Valley BanCorp, Inc.                      247
 2,100  Oriental Financial Group                       56
 4,500  Pacific Capital BanCorp.                      128
 1,500  Park National Corp.                           147
 1,100  Peoples Holding Co. (The)                      36
   800  Pinnacle Banc Group, Inc.                      25
 4,800  Premier Bancshares, Inc.                      100
 1,000  Prime Bancshares, Inc.                         17
 1,800  Prime BanCorp., Inc.                           48
 5,009  Provident Bankshares Corp.                    116
 7,370  Republic BanCorp.                              95
   900  Republic Bancshares, Inc.*                     17
 1,600  Republic Banking Corp.                         30
 9,416  Republic Security Financial Corp.              79
 3,300  Riggs National Corp. of Washington D.C.        55
 5,100  S & T BanCorp, Inc.                           127
 1,800  Sandy Spring BanCorp., Inc.                    50
 1,200  Shoreline Financial Corp.                      33
 3,600  Silicon Valley Bancshares*                     69
 1,200  Simmons First National Corp.                   40
 8,333  Sky Financial Group, Inc.                     245
 4,500  Southwest BanCorp. of Texas                    75
 1,500  Sterling BanCorp.                              31
 4,450  Sterling Bancshares, Inc.                      56
 1,100  Sterling Financial Corp.                       37
 6,893  Susquehanna Bancshares, Inc.                  125
 2,650  Texas Regional Bancshares                      72
 4,700  Triangle BanCorp., Inc.                        79
 3,000  Trust Co. of New Jersey                        66
 4,954  Trustco Bank Corp.                            136
 2,500  US BanCorp, Inc.                               38
 2,663  UMB Financial Corp.                           113
 8,000  United Bankshares, Inc.                       214
 2,810  United National BanCorp.                       64
 1,610  USB Holding Co., Inc.                          23
 7,928  UST Corp.                                     191
 2,400  Vermont Financial Services Corp.               75
 1,900  Washington Trust BanCorp.                      33
 3,850  Wesbanco, Inc.                                114
 2,650  West Coast BanCorp. of Oregon                  46
 7,500  Westamerica BanCorp.                          259
 3,900  Western BanCorp.                              159
 7,900  Westernbank Puerto Rico                       108
 4,375  Whitney Holding Corp.                         178
                                                  -------
                                                   10,224
                                                  -------
</TABLE>

See accompanying notes to financial statements.

                                       54
<PAGE>

- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 Shares Description                             Value
- ------------------------------------------------------
 <C>    <S>                                     <C>
 Beverages--0.4%
  3,400 Beringer Wine Estates Holdings*         $  138
  2,700 Boston Beer Company, Inc.*                  22
    359 Buenos Aires Embotelladora SA               --
  2,900 Canandaigua Brands, Inc.*                  144
    400 Coca-Cola Bottling Co. Consolidated         22
  6,600 Coors (Adolph)                             313
    198 Farmer Bros. Co.                            41
  1,337 Pepsi-Cola Puerto Rico Bottling Co.          6
  1,500 Robert Mondavi*                             51
                                                ------
                                                   737
                                                ------
 Biotechnology--1.1%
  6,900 Advanced Tissue Sciences, Inc.*             27
  2,900 Affymetrix, Inc.*                          102
  2,400 Aviron*                                     52
  1,900 Bio-Rad Laboratories, Inc.*                 54
  9,700 Bio-Technology General Corp.*               69
  4,400 Cell Genesys, Inc.*                         21
  1,900 Entremed, Inc.*                             49
  3,994 Enzo Biochem, Inc.*                         43
  4,200 Human Genome Sciences, Inc.*               177
  6,900 Icos Corp.*                                302
  3,300 Idec Pharmaceuticals Corp.*                166
  4,400 Incyte Pharmaceuticals, Inc.*              114
  3,100 Inhale Therapeutic Systems, Inc.*           82
  7,100 Liposome Co, Inc.*                         102
  6,200 Millennium Pharmaceuticals, Inc.*          235
  2,200 Neurogen Corp.*                             27
  5,456 Organogenesis, Inc.*                        60
  3,500 Protein Design Labs, Inc.*                  69
  4,300 Regeneron Pharmaceutical, Inc.*             31
  4,600 Serologicals Corp.*                         37
  1,900 Sugen, Inc.*                                39
  3,100 Transkaryotic Therapies, Inc.*              93
  3,000 Vical, Inc.*                                36
                                                ------
                                                 1,987
                                                ------
 Building Materials--1.1%
  2,600 Advanced Lighting Technologies, Inc.*       19
    700 Ameron International Corp.                  30
  5,100 Apogee Enterprises, Inc.                    61
  1,050 Butler MFG Co.                              30
  1,700 Centex Construction Products, Inc.          61
  7,100 Comfort Systems USA, Inc.*                 112
  6,500 Dal-Tile International, Inc.*               64
  2,450 Elcor Corp.                                 99
  2,500 Florida Rock Industries, Inc.              100
  2,300 Genlyte Group, Inc.*                        49
  1,700 Giant Cement Holding, Inc.*                 37
  2,000 Holophane Corp.*                            55
  7,000 Homebase, Inc.*                             40
  9,500 Hussmann International, Inc.*              152
  3,200 Juno Lighting, Inc.                         73
  3,600 Lone Star Industries, Inc.                 128
  4,100 Modine Manufacturing Co.                   132
</TABLE>
<TABLE>
<CAPTION>
 Shares Description                          Value
- ---------------------------------------------------
 <C>    <S>                                  <C>
  3,400 NCI Building Systems, Inc.*          $   86
  1,800 Nortek, Inc.*                            55
    800 Puerto Rican Cement Co., Inc.            26
  5,200 Rayonier, Inc.                          242
  1,600 Republic Group, Inc.                     29
    800 Simpson Manufacturing Co., Inc.*         36
  3,900 Texas Industries, Inc.                  142
  2,300 TJ International, Inc.                   63
  2,800 Universal Forest Products, Inc.*         50
                                             ------
                                              1,971
                                             ------
 Chemicals--1.3%
 11,500 Airgas, Inc.*                           132
  3,600 Albemarle Corp.                          81
  1,100 Bush Boake Allen, Inc.*                  32
  4,292 Cambrex Corp.                            97
  1,600 Carbide/Graphite Group*                  21
  3,400 Chemfirst, Inc.                          81
 11,600 Ethyl Corp.                              58
  6,600 Ferro Corp.                             192
  2,500 Fuller (H. B.) Co.                      159
  1,700 General Chemical Group, Inc.              7
  4,400 Geon Co.                                133
  5,800 Georgia Gulf Corp.                       87
  8,200 Hanna (M.A.) Co.                        121
  4,600 Lawter International, Inc.               56
  4,275 Lilly Industries, Inc.                   81
  2,700 MacDermid, Inc.                         109
  1,600 McWhorter Technologies, Inc.*            22
  3,600 Minerals Technologies, Inc.             192
  4,868 Mississippi Chemical Corp.               47
  4,000 NL Industries, Inc.                      42
  2,600 Octel Corp.*                             36
  4,400 OM Group, Inc.                          164
  1,400 Penford Corp.                            18
  6,000 Schulman (A.), Inc.                     100
  2,400 Spartech Corp.                           58
  1,400 Stepan Co.                               35
  6,100 Terra Industries, Inc.                   24
  2,000 Tetra Technologies, Inc.*                17
  1,700 Valhi, Inc.                              20
  5,800 Wellman, Inc.                            79
                                             ------
                                              2,301
                                             ------
 Commercial Services--4.7%
  2,700 Aaron Rents, Inc.*                       51
  1,500 Abacus Direct Corp.*                    110
  3,120 ABM Industries, Inc.                     85
  5,300 ABR Information Services, Inc.*         134
  1,100 Administaff, Inc.*                       18
  1,300 AHL Services, Inc.*                      34
  2,700 Alternative Resources Corp.*             21
  5,200 American Oncology Resources, Inc.*       53
  2,800 Ameripath, Inc.*                         26
  4,600 Avis Rent A Car, Inc.*                  132
    900 Bacou USA, Inc.*                         15
    447 Berlitz International, Inc.*             10
</TABLE>

See accompanying notes to financial statements.

                                       55
<PAGE>

Northern Institutional Funds
Equity Portfolios
- --------------------------------------------------------------------------------
Statements of Investments
May 31, 1999
(All amounts in thousands, except shares)
(Unaudited)
<TABLE>
<CAPTION>
 Shares Description                                Value
- ------------------------------------------------------------
                    Small Company Index Portfolio--Continued
 <C>    <S>                                        <C>
 Commercial Services--Continued
  3,200 Big Flower Holdings, Inc.*                 $  100
  6,900 Billing Concepts Corp.*                        86
  2,400 Borg-Warner Security Corp.*                    39
  1,900 Boron Lepore & Associates, Inc.*               18
  4,800 Budget Group, Inc.*                            64
  5,042 Building One Services Corp.*                   67
  4,400 Caribiner International, Inc.*                 24
  1,800 Carriage Services, Inc.*                       31
  2,000 CDI Corp.*                                     65
  2,100 Central Parking Corp.*                         68
 10,900 Century Business Services, Inc.*              121
  1,700 Chemed Corp.                                   55
  2,400 Coinmach Laundry Corp.*                        29
  3,200 Computer Learning Centers*                     16
  8,807 Concentra Managed Care, Inc.*                 129
  2,400 Cort Business Services Corp.*                  58
  1,800 CPI Corp.                                      57
  6,750 Crawford & Co.                                 93
  1,900 Crescent Operating, Inc.*                      10
  1,100 Data Processing Resources, Inc.*               17
  1,800 Data Transmission Network Corp.*               40
  1,400 DBT Online, Inc.*                              50
 11,100 Devry, Inc.*                                  247
  1,300 Diamond Technology Partners, Inc.*             31
  4,500 Dollar Thrifty Automotive Group, Inc.*         96
    800 Duff & Phelps Credit Rating, Inc.              49
  3,300 Education Management, Inc.*                    59
    600 Edutreck International, Inc.*                   3
  2,768 Electro Rent Corp.                             34
  2,200 F.Y.I., Inc.*                                  61
  2,900 First Consulting Group, Inc.*                  33
    400 Forrester Research, Inc.*                      13
  4,000 Franklin Covey Co.*                            39
  5,800 Group Maintenance American Corp.*              79
  2,200 Hagler Bailly, Inc.*                           18
  1,643 Healthplan Services Corp.                      15
  5,200 Hooper Holmes, Inc.*                           94
  3,700 Horizon Offshore, Inc.                         29
  3,800 Integrated Electrical Services, Inc.*          57
  8,800 Interim Services, Inc.*                       192
  2,400 International Telcomm Data Systems, Inc.       30
  3,250 Iron Mountain, Inc.*                           90
  3,050 ITT Educational Services, Inc.*                73
  1,400 Kendle International, Inc.*                    19
  1,700 Kroll-O'Gara Co.*                              34
  4,300 Labor Ready, Inc.*                            153
  1,500 Landauer, Inc.                                 42
  2,300 Lason, Inc.*                                   88
  2,000 Learning Tree International, Inc.*             21
  1,000 Leasing Solutions, Inc.*                        1
  1,700 Maximus, Inc.*                                 51
  1,400 McGrath RentCorp.                              26
 14,700 Medaphis Corp.*                                74
  6,300 Medquist, Inc.*                               232
</TABLE>
<TABLE>
<CAPTION>
 Shares Description                            Value
- -----------------------------------------------------
 <C>    <S>                                    <C>
  2,300 Memberworks, Inc.*                     $  104
  1,600 Meta Group, Inc.*                          22
  3,200 Metzler Group, Inc.*                      105
  3,100 Midas, Inc.                                97
  1,400 National Processing, Inc.*                  8
  1,550 NCO Group, Inc.*                           47
  3,250 NFO Worldwide, Inc.*                       46
  2,800 Norrell Corp.                              52
 12,990 Nova Corp.*                               289
  5,200 Novacare Employee Services, Inc.*          24
 12,500 Olsten Corp.                              111
  2,000 On Assignment, Inc.*                       51
  6,700 Orthodontic Centers of America*            81
  4,600 Parexel International Corp.*              110
  2,900 Paymentech, Inc.*                          73
  2,900 Pediatrix Medical Group, Inc.*             65
  6,100 Personnel Group of America, Inc.*          69
  3,145 Pharmaceutical Product Development*        84
 14,200 Phycor, Inc.*                              99
  3,800 Phymatrix, Inc.*                            6
  5,300 Physician Reliance Network, Inc.*          48
  1,400 Pierce Leahy Corp.*                        35
  2,800 Plexus Corp.                               86
  3,700 Prepaid Legal Services, Inc.*              98
  4,000 Primark Corp.*                            108
  2,100 Probusiness Services, Inc.*                65
  2,500 Profit Recovery Group International*       92
  4,000 Protection One, Inc.*                      22
    900 Remedytemp, Inc.*                          12
  2,560 Renaissance Worldwide, Inc.*               19
  2,900 Rent-A-Center, Inc.                        75
  3,070 Rent-Way, Inc.*                            77
  5,200 Rental Services Corp.                     124
  3,300 Rollins, Inc.                              55
  6,613 Romac International, Inc.*                 95
  5,100 Ruddick Corp.                              90
  2,600 Rural/Metro Corp.*                         20
    600 S M & A Corp.*                              4
  2,900 Service Experts, Inc.*                     54
  1,800 SOS Staffing Services, Inc.*               11
  7,500 Sotheby's Holdings, Inc.                  285
  2,800 Staff Leasing, Inc.*                       32
  4,100 Staffmark, Inc.*                           45
  1,350 Strayer Education, Inc.                    39
  1,300 Superior Consultant Holdings, Inc.*        49
  7,075 Sylvan Learning Systems, Inc.*            193
  4,000 Teletech Holdings, Inc.*                   30
  3,800 Trico Marine Services, Inc.*               27
  2,600 United Payors & United Providors           49
  5,655 United Rentals, Inc.*                     170
 12,000 USWeb, Corp.*                             305
  1,500 Volt Information Sciences, Inc.*           26
  1,900 Wackenhut Corrections Corp.*               38
  1,797 Wackhenut Corp.                            41
  1,300 Westaff, Inc.*                              9
                                               ------
                                                8,080
                                               ------
</TABLE>

See accompanying notes to financial statements.

                                       56
<PAGE>

- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 Shares Description                           Value
- ----------------------------------------------------
 <C>    <S>                                   <C>
 Computers--3.9%
  2,100 Anacomp, Inc.*                        $   40
  3,911 Analysts International Corp.              62
  4,600 Anixter International, Inc.*              81
    700 AnswerThink Consulting Group, Inc.*       18
  1,400 Apex PC Solutions, Inc.*                  25
  1,100 ARIS Corp.*                               10
  5,175 Avant! Corp.*                             63
  4,600 Axent Technologies, Inc.*                 57
  3,666 Banctec, Inc.*                            59
  2,700 Bell & Howell Co.*                       103
  4,500 Bisys Group, Inc.*                       247
  7,400 Checkfree Holdings Corp.*                348
  2,500 Complete Business Solutions*              61
  4,200 Compucom Systems, Inc.*                   17
  5,800 Computer Horizons Corp.*                 106
  3,200 Computer Task Group, Inc.                 53
  2,400 Cotelligent, Inc.*                        32
  3,600 Cylink Corp.*                             14
  9,300 Data General Corp.*                      122
  2,300 DecisionOne Holdings Corp.*                7
  6,500 Diamond Multimedia Systems*               29
 10,000 Electronics for Imaging, Inc.*           491
  1,800 Evans & Sutherland CMP Corp.*             28
  1,650 Factset Research Systems, Inc.*           71
  2,450 Henry (Jack) & Associates                 87
  7,200 HMT Technology Corp.*                     29
  3,700 Hutchinson Technology*                    86
  1,900 Hypercom Corp.*                           13
  7,004 Inacom Corp.                              77
    800 Intelligroup, Inc.*                        5
  8,000 Intergraph Corp.*                         64
  6,250 International Network Services*          234
  1,900 ISS Group, Inc.*                          53
  9,900 Komag, Inc.*                              38
  2,300 Kronos, Inc.*                             85
    700 Manhattan Associates, Inc.*                6
  3,700 Mastech Corp.*                            71
 11,500 Mentor Graphics Corp.*                   145
  5,400 Metamor Worldwide, Inc.                  148
  3,850 Microage, Inc.                            22
  6,500 Micron Electronics, Inc.*                 65
  3,000 Micros Systems, Inc.*                     94
  5,700 MMC Networks, Inc.*                      159
  4,700 MTI Technology, Corp.*                    42
  3,400 MTS Systems, Corp.                        40
  5,200 National Computer Systems, Inc.          163
 11,500 Network Appliance, Inc.*                 542
  1,700 Pomeroy Computer Resources*               24
  1,400 QRS Corp.*                               104
  1,300 Radiant Systems, Inc.*                    16
  8,400 Read-Rite Corp.*                          55
    800 RWD Technologies, Inc.*                   13
  5,200 Safeguard Scientifics, Inc.*             380
  3,600 Sandisk Corp.*                           112
</TABLE>
<TABLE>
<CAPTION>
 Shares Description                             Value
- ------------------------------------------------------
 <C>    <S>                                     <C>
  1,900 Sapient Corp.                           $  121
  2,300 SCM Microsystems, Inc.*                    133
  6,800 Security Dynamics Technologies*            129
  8,100 Sequent Computer Systems, Inc.*            105
  4,900 Smart Modular Technologies*                 74
  2,600 Splash Technology Holdings*                 21
  1,400 SPR, Inc.*                                   9
  3,100 Sykes Enterprises, Inc.*                    96
  1,000 Syntel, Inc.*                               11
  6,100 Systems & Computer Technology Co.*         100
  7,625 Technology Solutions Co.*                   71
  3,000 Telxon Corp.*                               31
  4,800 Tyler Technologies, Inc.*                   29
  3,700 Visual Networks, Inc.*                     109
  8,700 Wang Laboratories*                         252
  5,300 Whittman-Hart, Inc.*                       150
  4,500 Xircom, Inc.*                              114
                                                ------
                                                 6,671
                                                ------
 Cosmetics/Personal Care--0.0%
  1,800 Chattem, Inc.*                              65
  1,500 French Fragrances, Inc.*                    11
                                                ------
                                                    76
                                                ------
 Distribution/Wholesale--0.7%
  3,500 Anicom, Inc.                                32
  3,400 Aviall, Inc*                                53
  1,700 Aviation Sales Co.*                         65
  9,724 Brightpoint, Inc.*                          55
  2,700 CDW Computer Centers, Inc.*                117
  6,300 Cellstar Corp.*                             49
  6,300 CHS Electronics, Inc.*                      28
  2,100 Daisytek International Corp.*               34
  3,675 Insight Enterprises, Inc.*                  93
    900 JLK Direct Distribution, Inc.*              10
  2,900 Keystone Automotive Industries, Inc.*       47
 14,900 Merisel, Inc.*                              35
  3,700 Owens & Minor, Inc. Holding Co.             40
  2,500 Tristar Aerospace Co.*                      23
  2,200 U.S.A. Floral Products, Inc.*               16
 13,100 Unisource Worldwide, Inc.                  154
  6,900 United Stationers, Inc.*                   129
  2,700 VWR Scientific Products Corp.*              77
  4,300 Watsco, Inc.                                83
                                                ------
                                                 1,140
                                                ------
 Diversified Financial Services--2.8%
  4,750 Aames Financial Corp.*                       7
  4,400 Advanta Corp.                               76
  1,300 Advest Group, Inc.                          27
  4,300 Affiliated Managers Group*                 126
 11,700 Americredit Corp.*                         186
  3,500 Ameritrade Holding Corp.*                  314
    800 Amplicon, Inc.                              11
  3,800 Charter Municipal Mortgage Acceptance       49
  2,500 Cityscape Financial Corp.                  --
</TABLE>

See accompanying notes to financial statements.

                                       57
<PAGE>

Northern Institutional Funds
Equity Portfolios
- --------------------------------------------------------------------------------
Statements of Investments
May 31, 1999
(All amounts in thousands, except shares)
(Unaudited)
<TABLE>
<CAPTION>
 Shares Description                               Value
- ------------------------------------------------------------
                    Small Company Index Portfolio--Continued

 <C>    <S>                                       <C>
 Diversified Financial Services--Continued
  2,400 Conning Corp.                             $   41
  2,100 Contifinancial Corp.*                         15
  4,100 Credit Acceptance Corp.*                      25
  2,300 Dain Rauscher Corp.                          120
    900 Delta Financial Corp.*                         6
  5,800 Doral Financial Corp.                         98
  2,100 DVI, Inc.*                                    33
 38,000 E*trade Group, Inc.*                       1,691
  5,400 Eaton Vance Corp.                            165
  2,500 Everen Capital Corp.                          73
    600 Federal Agricultural Mortgage Co.*            41
  1,750 Financial Federal Corp.*                      39
  2,100 First Sierra Financial, Inc.*                 46
  1,000 Firstcity Financial Corp.*                     6
  1,900 Franchise Mortgage Acceptance Corp.*          17
  2,400 Freedom Securities Corp.                      42
  4,400 Friedman, Billings, Ramsey Group*             46
  1,000 Fund American Enterprise Holdings, Inc.      149
  3,300 Hambrecht & Quist, Inc.*                     119
  2,200 Healthcare Financial Partners*                74
  5,264 Imperial Credit Industries*                   43
  3,916 Investment Technology Group, Inc.*           174
  2,900 Jefferies Group, Inc.                         71
  1,100 John Nuveen Co.                               46
  3,900 Long Beach Financial Corp.*                   56
  2,100 Medallion Financial Corp.                     36
  3,546 Metris Cos., Inc.*                           207
  5,037 Morgan Keegan, Inc.                           93
  8,150 Phoenix Investment Partners Ltd.              80
  4,200 Pioneer Group, Inc.*                          74
  4,100 Resource America, Inc.                        59
  2,696 Resource Bancshares MTG Group                 28
     91 Search Financial Services                    --
  1,960 Southwest Securities Group                   131
    700 Student Loan Corp.                            28
  8,300 UniCapital Corp.*                             47
                                                  ------
                                                   4,815
                                                  ------
 Electric--2.4%
  7,550 Avista Corp.                                 136
  3,950 Black Hills Corp.                             91
  4,900 Calpine Corp.*                               266
  3,100 Central Hudson Gas & Electric                131
  2,500 Cilcorp, Inc.                                152
  4,200 Cleco Corp.                                  139
  6,000 CMP Group, Inc.                              122
  3,400 Commonwealth Energy System                   144
  3,800 Eastern Utilities Associates                 110
 10,300 EL Paso Electric Co.*                         88
  3,200 Empire District Electric Co.                  83
  5,950 Hawaiian Electric Industries                 219
  7,000 IdaCorp, Inc.                                233
  2,950 Madison Gas & Electric Co.                    63
</TABLE>
<TABLE>
<CAPTION>
 Shares Description                            Value
- -----------------------------------------------------
 <C>    <S>                                    <C>
  9,875 MDU Resources Group, Inc.              $  226
 13,500 Minnesota Power, Inc.                     290
  9,500 Nevada Power Co.                          239
  4,278 Northwestern Corp.                        112
  2,500 Orange & Rockland Utilities               145
  2,200 Otter Tail Power Co.                       86
  7,800 Public Service Co. Of New Mexico          162
  7,000 Rochester Gas & Electric Corp             196
  5,800 Sierra Pacific Resources                  211
  4,350 SIGCORP, Inc.                             137
  2,000 TNP Enterprises, Inc.                      75
  5,980 Unisource Energy Corp. Holding*            75
  2,700 United Illuminating Co.                   118
  4,900 WPS Resources Corp.                       157
                                               ------
                                                4,206
                                               ------
 Electrical Components & Equipment--0.7%
  1,375 AFC Cable Systems, Inc.*                   47
  2,900 Alpine Group, Inc.*                        47
  6,000 Ametek, Inc.                              138
  4,500 Belden, Inc.                              106
  2,300 C&D Technologies, Inc.                     63
  6,500 C-Cube Microsystems, Inc.*                163
  5,275 Cable Design Technologies Corp.*           75
  2,300 Encore Wire Corp.*                         22
  6,900 General Cable Corp.                       105
  3,500 Littelfuse, Inc.*                          70
  5,100 Rayovac Corp.                             129
  2,000 Scotsman Industries, Inc.                  41
  2,775 SLI, Inc.*                                 90
  3,600 Vicor Corp.*                               59
                                               ------
                                                1,155
                                               ------
 Electronics--3.0%
  1,500 Aavid Thermal Technologies*                30
  3,000 Amphenol Corp.*                           113
  1,200 Analogic Corp.                             39
  1,900 Benchmark Electronics, Inc.*               57
  5,100 BMC Industries, Inc.*                      51
  3,880 Brady Corp.                                97
  5,300 Checkpoint Systems, Inc.*                  48
  4,400 Coherent, Inc.*                            71
  1,800 Cohu, Inc.                                 54
  3,800 Credence Systems Corp.*                   113
  2,109 CTS Corp.                                 118
    976 Cubic Corp.                                24
  5,100 Cymer, Inc.*                               93
  5,700 DII Group, Inc.*                          188
  4,200 Dionex Corp.*                             172
  2,100 Electro Scientific Industries, Inc.*       79
  7,400 Fisher Scientific International           150
  5,400 Genrad, Inc.*                              99
 13,500 Gentex Corp.*                             405
  2,500 Hadco Corp.*                               77
  2,000 Harmon Industries, Inc.                    42
  2,800 Innovex, Inc.                              37
</TABLE>

See accompanying notes to financial statements.

                                       58
<PAGE>

- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 Shares Description                           Value
- ----------------------------------------------------
 <C>    <S>                                   <C>
 15,400 Integrated Device Technology, Inc.*   $  122
  1,600 ITI Technologies, Inc.*                   38
  2,100 Itron, Inc.*                              17
  8,400 Jabil Circuit, Inc.                      405
  7,100 Kemet Corp.*                             114
  5,200 Kent Electronics Corp.*                   68
  3,400 Lo-Jack Corp.*                            27
  6,650 Methode Electronics                      123
  7,100 Mettler Toledo International, Inc.*      176
  2,500 Micrel, Inc.*                            140
  9,400 Microchip Technology, Inc.*              412
  1,300 Moog, Inc.*                               36
  3,340 OAK Industries, Inc.*                    161
  1,698 Park Electrochemical Corp.                41
  6,432 Paxar Corp.*                              58
 10,500 Procurenet, Inc.*                        --
  1,900 Recoton Corp.*                            19
  1,400 Rogers Corp.*                             40
  2,200 Sawtek, Inc.*                             87
 12,600 Sensormatic Electronics Corp.*           169
  3,300 Sipex Corp.*                              53
  2,000 Spectra-Physics Lasers, Inc.*             16
  2,100 Stoneridge, Inc.*                         30
  4,100 Tava Technologies, Inc.*                  30
  2,600 Technitrol, Inc.                          77
  3,000 Thermedics, Inc.*                         26
    600 Thermo Optek Corp.*                        6
    700 Thermoquest Corp.*                         9
  4,100 Trimble Navigation Ltd.*                  51
  2,200 Triumph Group, Inc.*                      67
  1,800 Veeco Instruments, Inc.*                  55
  9,600 Vishay Intertechnology, Inc.*            200
  3,000 Watts Industries                          51
  1,600 Woodward Governor Co.                     40
  3,100 X-Rite, Inc.                              22
                                              ------
                                               5,143
                                              ------
 Engineering & Construction--0.4%
  3,000 Dames & Moore Group                       47
  3,400 Dycom Industries, Inc.*                  164
  7,600 Foster Wheeler Corp.                     105
  3,475 Granite Construction, Inc.                98
  3,700 Insituform Technologies, Inc.*            62
  4,100 Jacobs Engineering Group, Inc.*          152
  6,191 Morrison Knudsen Corp.*                   62
  1,300 Stone & Webster, Inc.                     32
  2,300 URS Corp.*                                57
                                              ------
                                                 779
                                              ------
 Entertainment--1.4%
  1,200 AMC Entertainment, Inc.*                  20
  1,400 Anchor Gaming*                            63
  5,500 Ascent Entertainment Group*               63
  8,400 Aztar Corp.*                              57
  6,700 Boyd Gaming Corp.*                        40
</TABLE>
<TABLE>
<CAPTION>
 Shares Description                         Value
- --------------------------------------------------
 <C>    <S>                                 <C>
  1,400 Carmike Cinemas, Inc.*              $   25
  1,900 Championship Auto Racing Teams*         64
  1,400 Churchill Downs, Inc.                   46
  1,800 Dover Downs Entertainment               34
  8,200 Fairfield Communities, Inc.            130
  3,800 Gaylord Entertainment Co.              118
  1,000 GC Cos., Inc.*                          36
  7,500 Gtech Holdings Corp.*                  185
  4,300 Harrah's Entertainment, Inc.            93
  3,600 Hollywood Park, Inc.*                   52
  3,500 International Speedway Corp.*          172
    298 Park Place Entertainment Corp.           3
  1,100 Penske Motorsports, Inc.*               54
 11,700 Premier Parks, Inc.*                   417
  1,800 Scientific Games Holdings, Inc.*        32
  5,300 SFX Entertainment, Inc.*               289
    800 Silverleaf Resorts, Inc.*                6
  2,300 Speedway Motorsports, Inc.*             92
  3,900 Station Casinos, Inc.*                  68
  1,600 Steinway Musical Instruments*           37
  5,100 Sunterra Corp.*                         69
    700 Trendwest Resorts, Inc.*                16
  5,000 Vail Resorts, Inc.*                    103
  1,400 Vistana, Inc.*                          22
                                            ------
                                             2,406
                                            ------
 Environmental Control--0.5%
 34,400 Aqua Alliance, Inc.*                    82
  6,300 Calgon Carbon Corp.                     36
  1,300 Casella Waste Systems, Inc.*            26
  8,900 Catalytica, Inc.*                      106
  2,800 Imco Recycling, Inc.                    47
  3,000 Ionics, Inc.*                           94
  5,500 Metal Management, Inc.*                 10
    700 Mine Safety Appliances Co.              44
  5,505 Safety-Kleen Corp.*                     86
  5,100 Superior Services, Inc.*               109
  4,200 Syntroleum Corp.*                       31
  5,497 Tetra Tech, Inc.*                      117
  1,250 Thermo Ecotek Corp.*                    13
    700 Waste Industries, Inc.*                 11
 23,900 Wastemasters, Inc.*                      3
                                            ------
                                               815
                                            ------
 Food--1.2%
  3,400 American Italian Pasta Company*         94
  7,000 Chiquita Brands International           56
  7,000 Corn Products International, Inc.      207
  3,900 Dreyer's Grand Ice Cream, Inc.          65
  8,000 Earthgrains Co.                        188
    100 Fleming Cos., Inc.*                      1
  3,300 Great Atlantic & Pacific Tea Co.       108
  2,500 Hain Food Group, Inc.*                  49
  3,300 Imperial Sugar Co.                      20
  1,700 Ingles Markets, Inc.                    21
</TABLE>

See accompanying notes to financial statements.

                                       59
<PAGE>

Northern Institutional Funds
Equity Portfolios
- --------------------------------------------------------------------------------
Statements of Investments
May 31, 1999
(All amounts in thousands, except shares)
(Unaudited)
<TABLE>
<CAPTION>
 Shares Description                            Value
- ------------------------------------------------------------
                    Small Company Index Portfolio--Continued

 <C>    <S>                                    <C>
 Food--Continued
  3,200 International Multifoods Corp.         $   70
  4,100 Lance, Inc.                                60
  2,400 Michael Foods, Inc.                        56
  2,350 Performance Food Group Co.*                56
    799 Pilgrims Pride Corp.*                      17
  5,800 RalCorp Holdings, Inc.*                   109
  8,900 Richfood Holdings, Inc.                   114
  1,400 Riviana Foods, Inc.                        29
    100 Seaboard Corp.                             26
  6,900 Smithfield Foods, Inc.*                   184
  4,900 Smucker (J.M.) Co.                        101
    900 United Natural Foods, Inc.*                24
  9,500 Universal Foods Corp.                     218
  4,800 Vlasic Foods International*                36
  2,000 Wild Oats Markets, Inc.*                   59
  2,900 Zapata Corp.                               23
                                               ------
                                                1,991
                                               ------
 Forest Products & Paper--0.5%
  4,400 Buckeye Technologies, Inc.*                72
  4,600 Caraustar Industries, Inc.                121
  3,600 Chesapeake Corp.*                         130
  2,200 Deltic Timber Corp.                        55
  4,800 Glatfelter (P.H.) Co.                      64
  5,400 Potlatch Corp.                            213
  2,170 Rock-Tenn Co.                              33
  2,600 Schweitzer-Mauduit International           40
  9,891 Wausau-Mosinee Paper Corp.                178
                                               ------
                                                  906
                                               ------
 Gas--1.7%
 10,700 AGL Resources, Inc.                       202
  5,750 Atmos Energy Corp.                        147
  1,700 Colonial Gas Co.                           58
  1,900 Connecticut Energy Corp.                   71
  4,200 Eastern Enterprises                       146
  4,900 Energen Corp.                              94
  5,533 Indiana Energy, Inc.                      122
  3,300 Laclede Gas Co.                            73
  3,300 New Jersey Resources                      125
  1,850 North Carolina Natural Gas                 62
  4,600 Northwest Natural Gas Co.                 110
  2,400 NUI Corp.                                  60
  5,900 Oneok, Inc.                               177
  2,000 Pennsylvania Enterprises, Inc.             58
  6,600 Peoples Energy Corp.                      254
  5,776 Piedmont Natural Gas Co.                  195
  3,850 Public Service Co. Of North Carolina      112
  3,287 SEMCO Energy, Inc.                         46
  1,420 South Jersey Industries                    40
  3,318 Southern Union Co.*                        75
  5,700 Southwest Gas Corp.                       161
  4,600 Southwestern Energy Co.                    43
</TABLE>
<TABLE>
<CAPTION>
 Shares Description                       Value
- ------------------------------------------------
 <C>    <S>                               <C>
  6,100 UGI Corp.                         $  120
  8,600 Washington Gas Light Co.             210
  7,000 Wicor, Inc.                          179
  1,950 Yankee Energy Systems, Inc.           62
                                          ------
                                           3,002
                                          ------
 Hand/Machine Tools--0.7%
  7,275 Applied Power, Inc.*                 176
  6,193 Baldor Electric Co.                  119
    868 Franklin Electric Co., Inc.           54
  1,800 Hardinge, Inc.                        32
  8,500 Lincoln Electric Holdings, Inc.      190
  7,000 Milacron, Inc.                       149
  3,900 Regal Beloit                          91
  5,800 SPX Corp.*                           450
  1,300 Starrett (L.S.) Co.                   35
                                          ------
                                           1,296
                                          ------
 Health Care--3.1%
  3,800 Acuson Corp.*                         59
  3,800 Adac Laboratories*                    31
  8,400 Alaris Medical, Inc.*                 42
  2,900 Alterra Healthcare Corp.              36
  1,700 American Homepatient, Inc.*            3
  3,200 American Retirement Corp.*            54
  7,700 Apria Healthcare Group, Inc.*        159
  2,600 Arrow International, Inc.             66
  3,000 Assisted Living Concepts, Inc.*        8
  5,700 Ballard Medical Products             135
  1,800 Brookdale Living Communities*         25
  2,000 Capital Senior Living Corp.*          22
  1,900 Carematrix Corp.*                     28
  2,200 Centennial HealthCare Corp.*          12
  1,200 Closure Medical Corp.*                37
  4,300 Columbia Laboratories, Inc.*          38
  2,850 Conmed Corp.*                         97
  2,800 Cooper Cos., Inc.*                    64
 10,850 Covance, Inc.*                       230
 10,900 Coventry Health Care, Inc.*          144
  2,400 Curative Health Services, Inc.*       16
  3,000 Cytyc Corp.*                          62
  2,400 Datascope Corp.*                      60
  2,100 Diagnostic Products Corp.             48
  6,600 Genesis Health Ventures*              29
  4,300 Haemonetics Corp.*                    82
  3,500 Hanger Orthopedic Group, Inc.*        57
  4,700 Henry Schein, Inc.*                  142
  2,500 Hologic, Inc.*                        19
  6,600 Idexx Laboratories, Inc.*            168
  2,000 Igen International, Inc.*             58
  1,600 Impath, Inc.*                         44
  4,400 Invacare Corp.*                      110
  9,000 Laboratory Corp. of America *         23
  1,900 Lifecore Biomedical, Inc.*            21
    330 LTC Healthcare, Inc.                   1
  5,900 Magellan Health Services*             48
</TABLE>

See accompanying notes to financial statements.

                                       60
<PAGE>

- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 Shares Description                          Value
- ---------------------------------------------------
 <C>    <S>                                  <C>
 13,627 Mariner Post-Acute Network*          $   31
  2,700 Maxxim Medical, Inc.*                    43
  4,264 Mentor Corp.                             68
  8,500 MID Atlantic Medical Services*           88
  2,800 Minimed, Inc.*                          165
  1,400 National Healthcare Corp.*               10
 11,700 Novacare, Inc.*                          25
  1,500 Novoste Corp.*                           38
  5,800 Oakley, Inc.*                            47
  1,700 Ocular Sciences, Inc.*                   52
  2,400 OEC Medical, Inc.*                       57
 15,000 Oxford Health Plans*                    286
  1,300 Perclose, Inc.*                          51
  1,600 Province Healthcare Co.*                 35
 13,125 PSS World Medical, Inc.*                162
  5,600 Quest Diagnostics, Inc.*                143
  7,550 Renal Care Group, Inc.*                 210
  2,250 Res-Care, Inc.*                          47
  2,700 Resmed, Inc.*                            76
  5,155 Respironics, Inc.*                       83
  1,800 Sabratek Corp.*                          41
  4,400 Sierra Health Services*                  67
  4,600 Sola International, Inc.*                77
  9,680 Sun Healthcare Group, Inc.*              11
  2,600 Sunrise Assisted Living, Inc.*           96
  3,700 Sunrise Medical, Inc.*                   31
  3,500 Techne Corp.*                            88
  1,100 Thermo Bioanalysis Corp.*                20
  3,400 Thermo Cardiosystems, Inc.*              41
  2,600 Thermolase Corp.*                         6
  1,750 Thermotrex Corp.*                        14
  1,200 Trex Medical Corp.*                       8
 11,500 Vencor, Inc.*                             8
  2,500 Ventana Medical Systems*                 50
 10,300 Visx, Inc.*                             535
  1,100 Vital Signs, Inc.                        21
  2,000 Wesley Jessen Visioncare*                62
  2,223 West Pharmaceutical Services, Inc.       76
  2,300 Xomed Surgical Products, Inc.*           94
                                             ------
                                              5,341
                                             ------
 Holding Companies--Diversified--0.1%
  2,532 Triarc Cos., Inc.*                       52
  7,600 Walter Industries, Inc.*                100
                                             ------
                                                152
                                             ------
 Home Builders--1.0%
  2,512 American Homestar Corp.*                 19
  3,700 Cavalier Homes, Inc.                     34
  7,704 Champion Enterprises, Inc.*             157
  3,100 Coachmen Industries, Inc.                68
  7,558 DR Horton, Inc.                         128
  8,900 Kaufman & Broad Home Corp.              215
  4,100 MDC Holdings, Inc.                       81
  2,300 Monaco Coach Corp.*                      69
  1,900 National RV Holdings, Inc.*              49
</TABLE>
<TABLE>
<CAPTION>
 Shares Description                           Value
- ----------------------------------------------------
 <C>    <S>                                   <C>
  1,700 NVR, Inc.*                            $   82
  8,750 Oakwood Homes*                           109
  3,520 Palm Harbor Homes, Inc.*                  76
  4,500 Pulte Corp.                              107
  2,800 Ryland Group, Inc.                        78
  1,400 Skyline Corp.                             44
  4,700 Standard-Pacific Corp.                    62
  1,283 Thor Industries, Inc.                     34
  4,500 Toll Brothers, Inc.*                      98
  2,479 U S Home Corp.*                           86
  2,700 Webb (DEL E.) Corp.                       61
  2,400 Winnebago Industries                      40
                                              ------
                                               1,697
                                              ------
 Home Furnishings--0.5%
  2,400 Bassett Furniture Industries              58
  1,900 Bush Industries                           28
  5,800 Fedders Corp.                             33
  3,310 Harman International                     147
  6,600 Kimball International                    119
  9,700 La-Z-Boy, Inc.                           193
    700 Meadowcraft, Inc.*                         7
  3,000 O'Sullivan Industries Holdings*           50
  1,100 Parkervision, Inc.*                       34
  2,900 Polycom, Inc.*                            74
  4,100 Windmere-Durable Holdings*                54
                                              ------
                                                 797
                                              ------
 Household Products/Wares--0.7%
  2,850 American Business Products, Inc.          45
  5,100 Central Garden and Pet Co.*               69
  3,300 Church & Dwight, Inc.                    141
  1,200 CSS Industries, Inc.*                     32
  1,400 DAY Runner, Inc.*                         17
  1,600 Fossil, Inc.*                             67
  2,900 Gibson Greetings, Inc.*                   21
  5,800 Harland (John H.) Co.                    104
  1,600 Hunt Corp.                                16
  6,500 Jostens, Inc.                            137
  2,400 New England Business Services, Inc.       65
  6,100 Playtex Products, Inc.                    92
  2,000 Russ Berrie & Co., Inc.                   51
  3,400 Scotts Company (The)                     150
  2,400 Standard Register Co.                     71
  7,900 Wallace Computer Services, Inc.          181
                                              ------
                                               1,259
                                              ------
 Housewares--0.3%
  3,000 Enesco Group, Inc.                        69
  3,200 Libbey, Inc.                              96
  9,857 Metromedia International Group*           82
  1,690 Mikasa, Inc.                              19
  1,300 National Presto Industries, Inc.          49
  2,550 Oneida Ltd.                               66
  2,400 Toro Co.                                  81
                                              ------
                                                 462
                                              ------
</TABLE>

See accompanying notes to financial statements.

                                       61
<PAGE>

Northern Institutional Funds
Equity Portfolios
- --------------------------------------------------------------------------------
Statements of Investments
May 31, 1999
(All amounts in thousands, except shares)
(Unaudited)
<TABLE>
<CAPTION>
 Shares Description                               Value
- ------------------------------------------------------------
                    Small Company Index Portfolio--Continued
 <C>    <S>                                       <C>
 Insurance--3.0%
  2,200 Acceptance Insurance Cos., Inc.*          $   35
  4,600 Alfa Corp.                                    79
  1,424 American Annuity Group, Inc.                  33
  3,000 American Heritage Life Investment Corp.       70
  1,600 American Medical Security Group               15
  4,300 Amerin Corp.*                                116
  2,849 Amerus Life Holdings, Inc.                    74
  3,300 Argonaut Group, Inc.                          89
  4,400 ARM Financial Group, Inc.                     66
  2,200 Baldwin & Lyons, Inc.                         46
  2,400 Blanch (EW) Holdings, Inc.                   154
  1,925 Brown & Brown, Inc.                           69
  4,100 Capital Re Corp.                              67
  1,600 Capitol Transamerica Corp.                    24
  1,500 Chartwell RE Corp.                            24
  2,600 Chicago Title Corp.                           96
  4,200 Cmac Investment Corp.                        212
  3,100 CNA Surety Corp.*                             45
  4,900 Commerce Group, Inc.                         114
  2,734 Delphi Financial Group*                       95
  4,500 Enhance Financial Services Group              88
  1,900 Executive Risk, Inc.*                        162
  5,900 FBL Financial Group, Inc.                    118
  4,281 Fidelity National Financial, Inc.             73
  9,750 First American Financial Corp.               160
  3,200 Foremost Corp. of America                     71
  1,800 Fpic Insurance Group, Inc.*                   81
  5,934 Frontier Insurance Group, Inc.               102
  3,400 Gallagher, Arthur J. & Co.                   166
  1,700 Guarantee Life Cos., Inc.                     34
  2,100 Harleysville Group, Inc.                      41
  7,100 HCC Insurance Holdings, Inc.                 158
  2,400 Highlands Insurance Group*                    26
  2,300 Hilb, Rogal & Hamilton Co.                    47
  5,350 HSB Group, Inc.                              220
    700 Kansas City Life Insurance Co.                57
    400 LabOne, Inc.                                   5
  2,800 Landamerica Financial Group, Inc.             80
  2,000 Liberty Funds                                103
  3,800 Life USA Holding, Inc.                        76
    800 Markel Corp.*                                151
  1,000 Meadowbrook Insurance Group                   14
  4,312 Medical Assurance, Inc.*                     120
    800 Midland Co.                                   20
  3,000 MMI Cos., Inc.                                52
  2,800 NAC RE Corp.                                 153
    400 National Western Life Insurance*              38
    800 Nymagic, Inc.                                 10
  1,100 Penn Treaty American Corp.*                   28
  4,900 Penncorp Financial Group, Inc.*                3
  1,200 Philadelphia Consolidated Holdings*           29
  2,800 PMA Capital Corp.                             58
  4,100 Presidential Life Corp.                       75
</TABLE>
<TABLE>
<CAPTION>
 Shares Description                            Value
- -----------------------------------------------------
 <C>    <S>                                    <C>
  1,851 Pxre Corp.                             $   34
  7,050 Reinsurance Group of America              275
  2,400 Risk Capital Holdings, Inc.*               38
  1,481 RLI Corp.                                  55
  2,200 Scpie Holdings, Inc.                       63
  5,200 Selective Insurance Group                  98
  2,700 State Auto Financial Corp.                 33
  2,400 Stewart Information Services               47
  1,950 Trenwick Group, Inc.                       61
  2,500 Triad Guaranty, Inc.*                      38
  7,000 UICI*                                     168
  1,250 United Fire & Casualty Co.                 33
  2,300 Vesta Insurance Group, Inc.                12
  3,900 W.R. Berkley Corp.                         99
  1,800 Zenith National Insurance Corp.            41
                                               ------
                                                5,237
                                               ------
 Investment Companies--0.0%
  1,000 PEC Israel Economic Corp.*                 32
                                               ------
 Iron/Steel--0.9%
  8,500 AK Steel Holding Corp.                    204
  3,300 Arch Coal, Inc.                            48
 16,800 Armco, Inc.*                              108
 24,206 Bethlehem Steel Corp.*                    201
  5,100 Birmingham Steel Corp.                     26
  3,600 Carpenter Technology                      103
  2,000 Citation Corp.*                            27
  2,100 Cleveland-Cliffs, Inc.                     78
  1,200 Gibraltar Steel Corp.*                     26
  4,200 Lone Star Technologies*                    65
 18,600 LTV Corp.                                 114
  3,800 National Steel Corp.                       29
  4,100 Oregon Steel Mills, Inc.                   56
  1,950 Reliance Steel & Aluminum                  69
  2,100 Roanoke Electric Steel Corp.               33
  1,500 Rouge Industries, Inc.                     13
  5,393 Ryerson Tull, Inc.                        124
    900 Schnitzer Steel Industries, Inc.           14
    900 Shiloh Industries, Inc.*                   11
  6,600 Steel Dynamics, Inc.*                     113
  2,800 WHX Corp.*                                 21
                                               ------
                                                1,483
                                               ------
 Leisure Time--0.3%
    800 Ambassadors International, Inc.*           11
  1,300 American Classic Voyager*                  23
  2,800 American Skiing Co.*                       13
  4,300 Bally Total Fitness Holding*              110
  1,800 Coleman Co., Inc.*                         16
  3,650 Family Golf Centers, Inc.*                 33
  2,117 K2, Inc.                                   21
  2,400 North Face, Inc.*                          22
  2,000 Pegasus Systems, Inc.*                     70
  4,200 Polaris Industries, Inc.                  181
  1,500 Travel Services International, Inc.*       12
                                               ------
                                                  512
                                               ------
</TABLE>

See accompanying notes to financial statements.

                                       62
<PAGE>

- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 Shares Description                           Value
- ----------------------------------------------------
 <C>    <S>                                   <C>
 Lodging--0.4%
  6,700 Choice Hotels International, Inc.*    $  104
 13,300 Extended Stay America, Inc.*             141
  5,100 Florida Panthers Holdings*                55
  3,300 Homestead Village, Inc.*                  10
  5,000 Lodgian, Inc.                             35
  4,259 Marcus Corp.                              53
  9,500 Prime Hospitality Corp.*                  99
  5,100 Red Roof Inns, Inc.*                      92
  2,000 Suburban Lodges of America*               14
                                              ------
                                                 603
                                              ------
 Machinery--Construction & Mining--0.4%
  2,800 Astec Industries, Inc.*                  105
  2,450 Commercial Intertech Corp.                37
  4,100 Global Industries Technologies *          51
  7,500 JLG Industries, Inc.                     145
  4,787 Manitowoc Co.                            163
  3,300 Terex Corp.*                             102
                                              ------
                                                 603
                                              ------
 Machinery--Diversified--1.7%
  1,400 Advanced Energy Industries*               35
  3,181 Albany International Corp.                74
  1,800 Allied Products                            9
  4,000 Applied Industrial Technology, Inc.       68
  4,400 Briggs & Stratton                        275
  2,950 Chart Industries, Inc.                    31
  6,300 Cognex Corp.*                            169
  2,100 Columbus McKinnon Corp. N.Y.              52
  1,800 DT Industries, Inc.*                      17
  3,200 Esterline Technologies Corp.*             48
  7,078 Flowserve Corp.                          145
  4,300 FSI International, Inc.                   35
  2,450 Gardner Denver Machinery, Inc.*           42
  3,600 Gerber Scientific, Inc.                   84
  1,500 Gleason Corp.                             25
  2,745 Graco, Inc.                               90
  3,500 Helix Technology Corp.                    60
  5,525 Idex Corp.                               155
  7,400 Imation Corp.*                           174
  2,900 Iteq, Inc.*                                6
  4,400 Kulicke & Soffa Industries                93
  2,150 Lindsay Manufacturing Co.                 38
  5,000 Magnetek, Inc.*                           51
  5,000 Motivepower Industries, Inc.*             85
  1,200 Nacco Industries                          89
  2,600 Nordson Corp.                            153
  1,900 Omniquip International, Inc.*             20
  5,100 Presstek, Inc.*                           36
  3,300 PRI Automation, Inc.*                     81
  1,448 Robbins & Myers, Inc.                     35
  1,700 Sauer, Inc.                               18
  2,100 Specialty Equipment Cos., Inc.*           61
  5,414 SpeedFam International, Inc.*             71
  5,200 Stewart & Stevenson Services              57
</TABLE>
<TABLE>
<CAPTION>
 Shares Description                            Value
- -----------------------------------------------------
 <C>    <S>                                    <C>
  3,400 Tecumseh Products Co.                  $  224
  1,700 Tennant Co.                                58
  1,800 Thermo Fibertek, Inc.                      13
  2,950 Thomas Industries, Inc.                    60
  6,800 Unova, Inc.*                               99
  4,300 Zebra Technologies Corp.                  138
                                               ------
                                                3,074
                                               ------
 Media--2.8%
  1,700 @Entertainment, Inc                        21
  2,800 Ackerley Group, Inc.*                      53
  5,800 Adelphia Communications*                  438
  5,400 Banta Corp.                               132
  6,900 Bowne & Co., Inc.                         116
  2,600 CD Radio, Inc.*                            59
  5,900 Century Communications*                   314
  2,200 Consolidated Graphics, Inc.*              101
  1,600 COX Radio, Inc.*                           86
  2,100 Emmis Communications Corp.*                98
    900 Gray Communication System*                 14
  7,500 Hollinger International, Inc.             104
  4,500 Houghton Mifflin Co.                      207
  2,700 Jones Intercable, Inc.*                   144
  2,000 Journal Register Co.*                      35
  8,300 LEE Enterprises                           241
  7,100 Mail-Well, Inc.*                          105
  4,275 Mcclatchy Co.                             157
  4,400 Media General, Inc.                       227
  2,608 Merrill Corp.                              39
  1,300 Metro Networks, Inc.*                      72
  1,800 On Command Corp.*                          25
    428 Panavision, Inc.                            4
  3,400 Paxson Communications Corp.*               44
  1,600 Pegasus Communications Corp.*              76
  3,600 Playboy Enterprises*                      105
  2,400 Scholastic Corp.*                         116
  4,400 Spelling Entertainment Group*              43
  7,600 United International Holdings, Inc.*      547
    700 United Television, Inc.                    70
 10,050 Valassis Communications, Inc.*            350
    400 Value Line, Inc.                           15
  3,900 Westwood One, Inc.*                       136
  4,800 Wiley (John) & Sons                       207
  7,200 World Color Press, Inc.*                  184
  1,700 Young Broadcasting Corp.*                  69
                                               ------
                                                4,754
                                               ------
 Metal Fabricate/Hardware--0.7%
  2,056 Castle (A.M.) & Co.                        32
  2,500 Chase Industries, Inc.*                    21
  2,466 Commercial Metals Co.                      58
  3,500 Intermet Corp.                             49
  5,900 Kaydon Corp.                              196
  2,600 Ladish Co., Inc.*                          21
  1,100 Lawson Products                            27
  2,900 Maverick Tube Corp.*                       37
</TABLE>

See accompanying notes to financial statements.

                                       63
<PAGE>

Northern Institutional Funds
Equity Portfolios
- --------------------------------------------------------------------------------
Statements of Investments
May 31, 1999
(All amounts in thousands, except shares)
(Unaudited)
<TABLE>
<CAPTION>
 Shares Description                       Value
- ------------------------------------------------------------
                    Small Company Index Portfolio--Continued
 <C>    <S>                               <C>
 Metal Fabricate/Hardware--Continued
  5,300 Metals USA, Inc.*                 $   61
  6,700 Mueller Industries, Inc.*            194
  3,600 NS Group, Inc.*                       26
  4,600 Precision Castparts Corp.            186
  2,700 Quanex Corp.                          71
  4,300 ROHN Industries, Inc.                  6
  1,100 Shaw Group, Inc. (The)*               14
    700 Special Metals Corp.*                  3
  3,400 Valmont Industries                    56
  2,600 Wolverine Tube, Inc.                  62
  3,700 Wyman-Gordon Co.*                     71
                                          ------
                                           1,191
                                          ------
 Metals--Diversified--0.5%
  6,900 Asarco, Inc.                         111
  3,000 Brush Wellman, Inc.                   51
  2,200 Century Aluminum Co.                  14
  2,200 Commonwealth Industries, Inc.         24
 10,300 Hecla Mining Co.*                     25
  5,400 Kaiser Aluminum Corp.*                47
    700 Maxxam, Inc.*                         43
 14,007 Placer Dome, Inc.                    156
  2,700 RTI International Metals, Inc.*       36
  4,700 Southern Peru Ltd.                    58
  5,700 Stillwater Mining Co.*               182
  4,100 Titanium Metals Corp.                 29
    700 Tremont Corp.                         13
                                          ------
                                             789
                                          ------
 Mining--0.1%
  4,400 Amcol International Corp.             62
 23,800 Battle Mountain Gold Co.*             58
                                          ------
                                             120
                                          ------
 Miscellaneous Manufacturing--1.8%
  2,600 ACX Technologies, Inc.*               32
  5,800 Aptargroup, Inc.                     160
  3,750 Arctic Cat, Inc.                      31
  5,896 Artesyn Technologies, Inc.           125
 17,200 Aura Systems, Inc.*                    4
  2,700 Barnes Group, Inc.                    62
  4,600 Blount International, Inc.           128
  4,450 Clarcor, Inc.                         82
  3,050 Cuno, Inc.*                           56
  4,300 Dexter Corp.                         167
  7,000 Donaldson Co., Inc.                  169
  8,500 Federal Signal Corp.                 203
  2,600 Foamex International, Inc.*           16
  3,400 Furon Co.                             62
  5,700 Griffon Corp.*                        46
  3,300 Heska Corp.*                          13
  2,800 Hexcel Corp.*                         30
  3,100 Justin Industries                     42
  2,900 Lydall, Inc.*                         35
</TABLE>
<TABLE>
<CAPTION>
 Shares Description                     Value
- ----------------------------------------------
 <C>    <S>                             <C>
  9,900 Mark IV Industries, Inc.        $  183
  6,600 Mascotech, Inc.                    103
  3,000 Matthews International Corp.        87
  3,394 Myers Industries, Inc.              78
    400 NCH Corp.                           22
  5,000 Polymer Group, Inc.*                61
  5,600 Roper Industries, Inc.             181
  1,900 Samsonite Corp.*                    12
  3,400 Scott Technologies, Inc.*           64
  2,600 Smith (A.O.) Corp.                  63
  1,928 SPS Technologies, Inc.*             82
  2,100 Standex International Corp.         55
  3,600 Sturm Ruger & Co., Inc.             40
  3,800 Synetic, Inc.*                     348
  3,800 Tredegar Corp.                      81
  3,200 Westinghouse Air Brake Co.*         73
  2,000 Zoltek Cos., Inc.*                  15
                                        ------
                                         3,011
                                        ------
 Office Furnishings--0.1%
  8,700 Interface, Inc.                     67
  2,500 Knoll, Inc.*                        61
    960 Virco Manufacturing                 18
                                        ------
                                           146
                                        ------
 Office/Business Equipment--0.0%
  1,100 General Binding Corp.               23
                                        ------
 Oil & Gas Producers--1.7%
  1,900 Atwood Oceanics, Inc.*              55
  5,940 Barrett Resources Corp.*           201
  1,300 Belco Oil & Gas Corp.*              10
  4,900 Benton Oil & Gas, Co.*              17
  3,400 Berry Petroleum                     48
  5,000 Brown (Tom), Inc.                   65
  4,200 Cabot Oil & Gas Corp.               75
 10,354 Chesapeake Energy Corp.             22
  4,500 Comstock Resources, Inc.*           18
  7,200 Cross Timbers Oil Co.               78
  5,500 Devon Energy Corp.                 191
  7,900 EEX Corp.                           54
  6,400 Forest Oil Corp.*                   68
  5,100 Frontier Oil Corp.*                 26
 27,100 Grey Wolf, Inc.*                    56
 24,900 Harken Energy Corp.*                48
  9,200 Helmerich & Payne*                 214
  1,078 Holly Corp.                         14
  1,500 Houston Exploration Co.*            28
  3,100 HS Resources, Inc.*                 37
  4,700 KCS Energy, Inc.*                    3
 23,400 Kelley Oil & Gas Corp.*             16
  3,400 Key Energy Group                    11
  3,656 Louis Dreyfus Natural Gas*          71
  9,800 Marine Drilling Co., Inc.*         141
  8,276 Meridian Resource Corp.*            44
  3,800 Mitchell Energy & Development       61
</TABLE>

See accompanying notes to financial statements.

                                       64
<PAGE>

- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 Shares Description                           Value
- ----------------------------------------------------
 <C>    <S>                                   <C>
  6,700 Newfield Exploration Co.*             $  170
  3,700 Nuevo Energy Co.*                         56
 11,600 Parker Drilling Co.*                      36
  5,900 Patterson Energy, Inc.*                   49
  1,100 Penn Virginia Corp.                       21
  3,100 Plains Resources, Inc.*                   53
  7,500 Pogo Producing Co.                       137
  9,400 Pride International, Inc.*                98
  6,800 Range Resources Corp.                     33
 31,750 Santa Fe Snyder Corp.*                   270
  2,000 St. Mary Land & Exploration               40
  2,500 Stone Energy Corp.*                       94
  2,720 Swift Energy Co.*                         35
  6,000 Tesoro Petroleum Corp.*                   71
  6,700 Titan Exploration, Inc.*                  31
      1 Transtexas Gas Corp.*                    --
  7,000 Vintage Petroleum, Inc.                   79
  2,530 WD-40 Co.                                 65
                                              ------
                                               3,010
                                              ------
 Oil & Gas Services--0.8%
    900 CAL Dive International, Inc.*             22
    600 Carbo Ceramics, Inc.                      13
  2,600 Daniel Industries                         55
  2,100 Friede Goldman International, Inc.*       36
  1,400 Gulf Island Fabrication, Inc.*            15
  5,300 Hanover Compressor Co.*                  147
  8,400 Input/Output, Inc.*                       71
  3,000 IRI International Corp.*                  15
  1,200 Lufkin Industries, Inc.                   20
 12,760 Newpark Resources*                       115
 30,700 Ocean Energy, Inc.                       303
  4,200 Oceaneering International, Inc.*          65
    700 Omni Energy Services Corp.*                3
  3,900 Pool Energy Services Co.*                 66
  2,500 RPC, Inc.                                 22
  2,400 Seacor Smit, Inc.*                       119
  4,400 Seitel, Inc.*                             70
  3,900 Superior Energy Services*                 18
  8,300 Tuboscope, Inc.*                         111
  2,300 UTI Energy Corp.*                         33
  4,200 Veritas DGC, Inc.*                        77
                                              ------
                                               1,396
                                              ------
 Packaging & Containers--0.5%
  5,600 Ball Corp.                               273
  1,100 Bway Corp.*                               16
  5,000 Earthshell Corp.*                         37
  9,900 Gaylord Container Corp.                   83
  2,600 Greif Brothers Corp.                      67
  3,400 Ivex Packaging Corp.*                     65
  9,600 Longview Fibre Co.                       130
  4,150 Shorewood Packaging Corp.*                71
  2,100 Silgan Holdings, Inc.*                    42
                                              ------
                                                 784
                                              ------
</TABLE>
<TABLE>
<CAPTION>
 Shares Description                       Value
- ------------------------------------------------
 <C>    <S>                               <C>
 Pharmaceuticals--3.5%
  1,600 Advance Paradigm, Inc.*           $   77
  2,100 Algos Pharmaceuticals Corp.*          47
  4,200 Alkermes, Inc.*                      104
     76 Alpha 1 Biomedicals, Inc.            --
  3,400 Alpharma, Inc., Class A               91
  8,000 Amerisource Health Corp.*            236
  1,300 Andrx Corp.*                         131
  5,600 AxyS Pharmaceuticals, Inc.*           20
  1,700 Barr Laboratories, Inc.*              56
  3,133 Bindley Western Industries*           94
  2,600 Biomatrix, Inc.*                      80
  2,579 Block Drug Co.                        96
  4,100 Carter-Wallace, Inc.                  74
  5,000 Cephalon, Inc.*                       68
  2,400 Chirex, Inc.*                         72
  4,600 COR Therapeutics, Inc.*               65
  2,600 Coulter Pharmaceutical, Inc.*         68
  8,200 Dura Pharmaceuticals, Inc.*           85
  6,200 Express Scripts, Inc.                435
  3,300 Fuisz Technologies, Ltd.*             13
  2,500 Geltex Pharmaceuticals, Inc.*         43
 14,800 Gensia Sicor, Inc.*                   67
  5,700 Gilead Sciences, Inc.*               249
  3,000 Guilford Pharmaceuticals, Inc.*       32
  2,266 Herbalife International, Inc.         25
  4,500 Imclone Systems*                      89
  4,500 Immune Response Corp.*                29
  5,000 Isis Pharmaceuticals, Inc.*           51
 17,800 Ivax Corp.*                          239
  4,300 Jones Pharma, Inc.                   153
  2,550 KV Pharmaceutical Co.*                44
  7,458 Ligand Pharmaceuticals, Inc.*         76
  3,400 Macrochem Corp.*                      27
  5,300 Medicis Pharmaceutical*              142
  9,100 Medimmune, Inc.*                     579
  1,600 Miravant Medical Technologies*        12
  2,623 Natures Sunshine Products, Inc.       32
 10,900 NBTY, Inc.*                           68
  2,700 NCS Healthcare, Inc.*                 37
  5,400 Nexstar Pharmaceuticals, Inc.*        95
  1,500 Omega Protein Corp.*                   9
  3,000 Pathogensis Corp.*                    43
  4,050 Patterson Dental Co.*                148
 11,900 Perrigo Co.*                         109
  2,300 Pharmacyclics, Inc.*                  43
  6,209 Priority Healthcare Corp.*           212
  4,800 Roberts Pharmaceutical Corp.*         91
  3,000 Sangstat Medical Corp.*               41
    900 Schein Pharmaceutical, Inc.*          12
  7,000 Scios, Inc.*                          25
  5,700 Sepracor, Inc.*                      363
  2,200 SuperGen, Inc*                        38
  4,800 Theragenics Corp.*                    36
  4,300 Triangle Pharmaceuticals, Inc.*       80
</TABLE>

See accompanying notes to financial statements.

                                       65
<PAGE>

Northern Institutional Funds
Equity Portfolios
- --------------------------------------------------------------------------------
Statements of Investments
May 31, 1999
(All amounts in thousands, except shares)
(Unaudited)
<TABLE>
<CAPTION>
 Shares Description                           Value
- ------------------------------------------------------------
                    Small Company Index Portfolio--Continued
 <C>    <S>                                   <C>
 Pharmaceuticals--Continued
  4,200 Twinlab Corp.*                        $   39
  5,000 US Bioscience, Inc.*                      40
  4,700 Vertex Pharmaceuticals, Inc.*             94
  3,900 Veterinary Centers of America*            54
  2,200 Viropharma, Inc.*                         17
  5,900 Vivus, Inc.*                              25
  6,164 Warner-Lambert Co.                       382
  1,700 Weider Nutrition International             9
  6,600 Zila Pharmaceuticals, Inc.*               23
  2,100 Zonagen, Inc.*                            23
                                              ------
                                               5,957
                                              ------
 Pipelines--0.2%
  6,300 Equitable Resources, Inc.                199
  4,800 Transmontaigne, Inc.*                     68
  4,000 Western Gas Resources, Inc.               52
                                              ------
                                                 319
                                              ------
 Real Estate--0.4%
  1,100 Avatar Holdings, Inc.*                    20
  2,400 Castle & Cooke, Inc.*                     38
  2,500 CB Richard Ellis, Inc*                    48
  2,500 Forest City Enterprises, Class A          69
  1,462 Getty Realty Corp.                        20
  3,700 Grubb & Ellis Co.*                        24
  2,933 Insignia Financial Group, Inc.*           36
  3,000 Jones Lang LaSalle, Inc.                  85
  4,800 LNR Property Corp.*                       96
  7,600 Security Capital Group, Inc.*            113
  5,400 Trammell Crow Co.*                       100
  3,300 Wellsford Real Properties, Inc.*          34
                                              ------
                                                 683
                                              ------
 Real Estate Investment Trusts--6.5%
    670 Alexander's, Inc.*                        50
  2,000 Alexandria Real Estate Equities           63
  4,300 American Health Properties                86
  2,500 Amli Residential Properties               56
  3,700 Anthracite Capital, Inc.                  26
  3,200 Associated Estates Realty                 37
  4,100 Bedford Property Investors                71
  6,800 Berkshire Realty Co.                      78
  3,200 Boykin Lodging Co.                        48
  4,503 Bradley Real Estate, Inc.                 94
  6,200 Brandywine Realty Trust                  120
  8,224 BRE Properties, Inc., Class A            212
  5,900 Burnham Pacific Property, Inc.            65
  3,500 Cabot Industrial Trust                    75
  8,333 Camden Property Trust                    229
  3,400 Capital Automotive                        44
 11,475 Capstead Mortgage Corp.*                  67
  4,300 CBL & Associates Properties              111
  3,800 Centerpoint Properties Corp.             136
  4,800 Centertrust Retail Properties, Inc.       57
</TABLE>
<TABLE>
<CAPTION>
 Shares Description                           Value
- ----------------------------------------------------
 <C>    <S>                                   <C>
  3,900 Chateau Communities, Inc.             $  118
  2,900 Chelsea GCA Realty, Inc.                 110
  4,800 Colonial Properties Trust                135
  5,600 Commercial NET Lease Realty               74
  7,300 Cornerstone Realty Income Trust           76
  4,700 Cousins Properties, Inc.                 163
  9,300 Criimi MAE, Inc.                          22
  1,400 Crossmann Communities, Inc.               37
  4,300 Crown American Realty                     33
 10,700 Developers Diversified Realty            177
  8,100 Dynex Capital, Inc.                       25
  3,000 Eastgroup Properties                      61
  2,600 Entertainment Properties Trust            49
  6,800 Equity Inns, Inc.                         65
  2,700 Essex Property Trust, Inc.                87
  7,400 Federal Realty Investments Trust         171
 12,033 Felcor Lodging Trust, Inc.               273
  7,100 First Industrial Realty Trust            192
  5,800 First Union Real Estate                   29
 10,400 Franchise Finance Corp. of America       256
  4,900 Gables Residential Trust                 118
  7,300 General Growth Properties                281
  5,900 Glenborough Realty Trust, Inc.           108
  4,400 Glimcher Realty Trust                     75
  1,400 Golf Trust Of America, Inc.               34
  3,100 Great Lakes Reit, Inc.                    49
  5,800 Health Care Property Investors           176
  5,300 Health Care Reit, Inc.                   131
  7,399 Healthcare Realty Trust, Inc.            160
  3,400 Home Properties of New York, Inc.         89
  6,800 Hospitality Properties Trust             184
  4,600 IMPAC Mortgage Holdings, Inc.             25
  6,400 Imperial Credit Commerical Mortgage       66
  6,100 Innkeepers USA Trust                      63
  5,800 IRT Property Co.                          56
  3,500 Irvine Apartment Communities             118
  6,150 JDN Realty Corp.                         135
  2,400 JP Realty, Inc.                           49
  5,100 Kilroy Realty Corp.                      126
  4,900 Koger Equity, Inc.                        82
  2,200 LaSalle Hotel Properties                  31
  3,400 Laser Mortgage Management, Inc.           12
  3,200 Lexington Corporate Properties            37
  5,200 LTC Properties, Inc.                      69
  5,700 Macerich Company (The)                   151
  4,000 Manufactured Home Communities            103
  8,742 Meristar Hospitality Corp.*              191
  2,600 MGI Properties, Inc.                      72
  3,500 Mid-America Apartment Communities         80
  2,800 Mills Corp.                               62
  2,300 National Golf Properties, Inc.            59
  4,200 National Health Investors                 98
  8,100 Nationwide Health Properties, Inc.       165
 16,480 New Plan Excel Realty Trust              330
  3,300 Ocwen Asset Investment Corp.              18
</TABLE>

See accompanying notes to financial statements.

                                       66
<PAGE>

- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 Shares Description                                    Value
- -------------------------------------------------------------
 <C>    <S>                                           <C>
  3,718 Omega Healthcare Investors                    $    98
  3,300 Pacific Gulf Properties, Inc.                      73
  1,900 PAN Pacific Retail Properties, Inc.                38
  1,900 Parkway Properties, Inc.                           63
  2,200 Pennsylvania Real Estate Investment Trust          46
  7,200 Prentiss Properties Trust                         170
  1,309 Price Enterprises, Inc.                            10
    800 Prime Group Realty Trust                           13
  7,997 Prime Retail, Inc.                                 71
 21,000 Prison Realty Trust, Inc.                         265
  4,400 PS Business Parks, Inc.                           109
  5,000 Realty Income Corp.                               120
  7,500 Reckson Associates Realty                         194
  1,900 Redwood Trust, Inc.                                32
  5,900 Regency Realty Corp.                              130
  4,200 RFS Hotel Investors, Inc.                          57
  5,400 Shurgard Storage Centers, Inc.                    147
  4,500 SL Green Realty Corp.                              98
  3,300 Smith (Charles E.) Residential Realty, Inc.       114
  2,300 Sovran Self Storage, Inc.                          57
  5,200 Storage USA, Inc.                                 174
  4,500 Summit Properties, Inc.                            87
  3,200 Sun Communities, Inc.                             117
  7,000 Sunstone Hotel Investors, Inc.                     63
  1,000 Tanger Factory Outlet Centers, Inc.                25
  7,200 Taubman Centers, Inc.                              99
  4,000 Thornburg Mortgage Asset Corp.                     42
  3,600 Tower Realty Trust, Inc.                           83
  2,900 Town & Country Trust                               49
  4,200 Trinet Corporate Realty Trust                     114
 19,300 United Dominion Realty Trust                      213
  1,800 Urban Shopping Centers, Inc.                       59
 10,100 Ventas, Inc.                                       54
  4,200 Walden Residential Properties, Inc.                84
  6,600 Washington Reit                                   117
  3,700 Weeks Corp.                                       116
  5,000 Weingarten Realty Investment                      210
  3,200 Western Investment Real Estate Trust               38
  5,600 Westfield America, Inc.                            93
                                                      -------
                                                       11,223
                                                      -------
 Retail--4.7%
 26,600 7-Eleven, Inc.                                     63
  1,568 99 Cents Only Stores*                              74
  7,400 Advantica Restaurant Group, Inc.*                  34
  5,000 American Eagle Outfitters, Inc.*                  204
  4,300 Ames Department Stores, Inc.*                     176
  3,700 Ann Taylor Stores Corp.*                          160
  4,600 Applebees International, Inc.                     136
  4,912 Avado Brands, Inc.*                                44
  1,700 Barnett, Inc.*                                     16
  1,300 Blair Corp.                                        22
  7,600 BOB Evans Farms                                   146
  2,300 Boise Cascade Office Product*                      27
  3,400 Brown Shoe Company, Inc.                           65
  1,300 Buckle, Inc.*                                      36
</TABLE>
<TABLE>
<CAPTION>
 Shares Description                           Value
- ----------------------------------------------------
 <C>    <S>                                  <C>
  8,140 Buffets, Inc.*                       $    85
  3,780 Burlington Coat Factory Warehouse*        64
  9,800 Casey's General Stores, Inc.*            132
  4,700 Cash America Investments, Inc.*           60
  2,900 Cato Corp.                                38
  3,507 CDnow, Inc.*                              63
  3,350 CEC Entertainment, Inc.*                 127
 18,200 Charming Shoppes*                         92
  3,100 Cheesecake Factory (The)*                 86
  2,400 Childrens Place*                          93
  7,650 Claire's Stores, Inc.                    224
  1,900 Coldwater Creek, Inc.*                    38
  2,500 Cole National Corp.*                      23
  3,860 Consolidated Products, Inc.*              71
  3,500 Copart, Inc.*                             64
 19,400 Corporate Express, Inc.*                 127
  2,450 Cost Plus, Inc.*                          92
  3,500 CSK Auto Corp.*                           98
  2,400 Dave & Buster's, Inc.*                    65
    600 Delia*s, Inc.*                             8
  1,600 Discount Auto Parts*                      40
  3,100 Dress Barn, Inc.*                         46
  3,200 Duane Reade, Inc.*                       102
  2,900 Elder-Beerman Stores Corp.*               25
  3,200 Finish Line*                              39
  1,300 Finlay Enterprises*                       18
  6,300 Foodmaker, Inc.*                         170
  4,600 Footstar, Inc.*                          179
  1,600 Fred's, Inc.                              21
  2,200 Friedman's, Inc.*                         20
  1,700 Gadzooks, Inc.*                           16
  2,800 Garden Ridge Corp.*                       17
  4,500 Genesco, Inc.*                            60
  2,100 Genesis Direct, Inc.*                      7
  3,500 Goody's Family Clothing, Inc.*            38
  2,600 Group 1 Automotive, Inc.*                 65
  3,200 Guitar Center, Inc.*                      49
  4,500 Gymboree Corp.*                           55
  3,700 Hancock Fabrics, Inc.                     21
  5,900 Handleman Co.*                            70
 21,700 Hanover Direct, Inc.*                     56
  1,600 Haverty Furniture                         47
 11,100 Heilig-Meyers Co.                         77
  5,400 Hollywood Entertainment Corp.*           139
  5,300 Host Marriott Services Corp.*             41
  4,000 Hughes Supply, Inc.                      108
  3,400 Ihop Corp.*                               81
  3,100 Jo-Ann Stores, Inc.*                      52
  4,550 Just For Feet, Inc.*                      35
  1,100 K & G Men's Center, Inc.*                 12
  1,300 Kenneth Cole Productions, Inc.*           39
  2,600 Land's End, Inc.*                        111
  4,800 Landry's Seafood Restaurant*              44
  7,300 Linens 'N Things, Inc.*                  291
  8,400 Lone Star Steakhouse & Saloon*            85
</TABLE>

See accompanying notes to financial statements.

                                       67
<PAGE>

Northern Institutional Funds
Equity Portfolios
- --------------------------------------------------------------------------------
Statements of Investments
May 31, 1999
(All amounts in thousands, except shares)
(Unaudited)
<TABLE>
<CAPTION>
 Shares Description                          Value
- ------------------------------------------------------------
                    Small Company Index Portfolio--Continued
 <C>    <S>                                 <C>
 Retail--Continued
  5,700 Longs Drug Stores, Inc.             $   198
  4,200 Luby's, Inc.                             71
  3,500 Maxim Group, Inc. (The)*                 31
     10 MAY Department Stores Co.*               --
  4,012 Men's Wearhouse, Inc.*                  102
  4,500 Michaels Stores, Inc.*                  120
  6,500 Micro Warehouse, Inc.*                  101
  1,700 Movado Group, Inc.                       41
  6,700 Musicland Stores Corp.*                  59
  1,700 NPC International, Inc.                  30
  2,900 O'Reilly Automotive, Inc.*              128
    600 Onsale, Inc.*                            12
  3,775 Pacific Sunwear Of California*          142
  3,850 Papa John's International, Inc.*        152
  2,000 Party City Corp.*                         8
  3,950 Petco Animal Supplies, Inc.*             56
 21,600 Petsmart, Inc.*                         194
    700 PJ America, Inc.*                        16
  6,800 Planet Hollywood International*           6
  4,350 Rainforest Cafe, Inc.*                   24
  5,000 Regis Corp.                             121
  5,400 Ruby Tuesday, Inc.*                     100
  7,300 Ryan's Family Steak Houses, Inc.*        85
  2,450 Sbarro, Inc.*                            67
  4,900 Shopko Stores, Inc.*                    174
  1,800 Smart & Final, Inc.                      17
  3,550 Sonic Corp.*                             98
  5,300 Spiegel, Inc.*                           39
  5,900 Sports Authority, Inc.                   29
  5,000 Stage Stores, Inc.                       27
  5,100 Stein Mart, Inc.*                        47
  7,900 Sunglass HUT International, Inc.*       120
  1,400 Syms Corp.*                              11
  3,000 Systemax, Inc.                           41
  2,100 Talbots, Inc.                            67
  2,400 TCBY Enterprises, Inc.                   16
  2,850 Trans World Entertainment                36
  3,000 United Auto Group, Inc.*                 30
  1,800 Urban Outfitters, Inc.*                  43
  2,200 Value City Dept Stores, Inc.*            21
  1,700 West Marine, Inc.*                       22
  2,000 WET Seal, Inc.*                          55
  2,000 Wilmar Industries, Inc.*                 23
  6,700 Zale Corp.*                             258
                                            -------
                                              8,167
                                            -------
 Savings & Loans--1.7%
  3,300 Anchor BanCorp Wisconsin, Inc.           54
  1,200 Andover BanCorp, Inc.                    35
  7,300 Arcadia Financial Ltd.*                  54
  6,700 Bancatlantic BanCorp., Inc.              54
  3,600 Bank Plus Corp.*                         19
  2,400 Bankunited Financial Corp.*              22
</TABLE>
<TABLE>
<CAPTION>
 Shares Description                           Value
- ----------------------------------------------------
 <C>    <S>                                  <C>
  3,600 Bay View Capital Corp.               $    65
  2,500 Brookline BanCorp, Inc.                   29
  1,650 CFSB BanCorp., Inc.                       42
 11,294 Commercial Federal Corp.                 258
  2,454 Commonwealth BanCorp., Inc.               40
  2,400 Dime Community Bancshares                 53
  3,806 Downey Financial Corp.                    84
  3,000 First Federal Capital Corp.               44
  2,500 First Financial Holdings, Inc.            48
  1,757 First Indiana Corp.                       34
  2,100 First Liberty Financial Corp.             60
  7,995 First Sentinel BanCorp., Inc.             66
  2,220 First Washington BanCorp., Inc.           45
  3,700 Firstfed Financial Corp.*                 70
  1,000 Flagstar BanCorp., Inc.                   23
  2,706 Harbor Florida Bancshares, Inc.           32
  1,500 Harris Financial, Inc.                    17
  1,600 Haven BanCorp., Inc.                      22
 14,100 Independence Community Bank              187
  1,700 Jefferson Savings BanCorp., Inc.          21
  1,400 JSB Financial, Inc.                       72
  3,800 Local Financial Corp.*                    38
  4,488 MAF BanCorp., Inc.                       104
  2,700 Northwest BanCorp., Inc.                  25
  2,300 Ocean Financial Corp.                     41
  2,300 PBOC Holdings, Inc.*                      20
  6,100 Peoples BanCorp, Inc.                     63
  2,900 PFF BanCorp, Inc.*                        53
  3,250 Queens County BanCorp., Inc.             103
  1,600 Reliance BanCorp, Inc.                    45
  4,400 Richmond County Financial Corp.           80
 14,395 Roslyn BanCorp., Inc.                    261
  7,719 St. Paul BanCorp., Inc.                  200
  7,900 Staten Island BanCorp., Inc.             152
  7,000 Webster Financial Corp.                  203
  1,818 Westcorp                                  17
    500 Wilshire Financial Services Group*       --
  1,800 WSFS Financial Corp.                      26
                                             -------
                                               2,981
                                             -------
 Semiconductors--2.8%
  3,400 Actel Corp.*                              44
  6,800 Amkor Technology, Inc.*                   63
  4,300 Applied Micro Circuits Corp.*            254
  1,300 Artisan Components, Inc.*                  9
  2,400 Aspec Technology, Inc.                     2
  3,000 ATMI, Inc.*                               66
  4,475 Burr-Brown Corp.*                        143
 12,300 Cirrus Logic, Inc.*                       92
 15,900 Cypress Semiconductor Corp.*             177
  5,300 Dallas Semiconductor Corp.               231
    900 Dupont Photomasks, Inc.*                  35
  3,700 Electroglas, Inc.*                        54
  3,900 Etec Systems, Inc.*                      105
  5,300 General Semiconductor, Inc.               41
  9,600 International Rectifier Corp.*           104
</TABLE>

See accompanying notes to financial statements.

                                       68
<PAGE>

- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 Shares Description                          Value
- ---------------------------------------------------
 <C>    <S>                                 <C>
  1,900 Kopin Corp.*                        $    38
  7,100 Lam Research Corp.*                     197
  4,100 Lattice Semiconductor Corp.*            201
  7,300 Level One Communications, Inc.*         330
  3,100 Marshall Industries*                     55
  3,600 MEMC Electronics Materials*              30
  7,200 Novellus Systems, Inc.*                 351
  6,800 OAK Technology, Inc.*                    24
  3,900 Photronics, Inc.*                        77
  4,937 Pioneer Standard Electronics             48
 11,500 PMC--Sierra, Inc.*                      558
  3,300 Qlogic Corp.*                           362
  2,800 Rambus, Inc.                            217
  2,500 SDL, Inc.*                              233
  2,300 Semtech Corp.*                           96
  6,100 Silicon Valley Group, Inc.*              84
  1,900 Siliconix, Inc.*                         70
  3,900 Ultratech Stepper, Inc.*                 51
  5,900 Unitrode Corp.*                         123
  9,400 Vlsi Technology, Inc.*                  197
                                            -------
                                              4,762
                                            -------
 Shipbuilding--0.2%
  1,800 Avondale Industries, Inc.*               66
  5,350 Halter Marine Group, Inc.*               39
  6,400 Newport News Shipbuilding               176
                                            -------
                                                281
                                            -------
 Software--8.2%
  2,700 3DFX Interactive, Inc.*                  52
  8,200 Acclaim Enmnt, Inc.*                     53
  9,620 Acxiom Corp.*                           260
  1,600 Advantage Learning Systems, Inc.*        36
  1,000 Advent Software*                         70
  1,900 Alydaar Software Corp.*                   7
  7,900 American Management Systems*            251
  1,940 Applied Graphics Technologies*           21
  3,200 Aspect Development, Inc.*                46
  4,600 Aspen Technology, Inc.*                  48
  4,300 Avid Technology, Inc.*                   70
  2,000 Barra, Inc.*                             48
  8,200 BEA Systems, Inc.*                      167
  3,300 Black Box Corp.*                        151
  3,300 Broadvision, Inc.*                      172
  4,400 CCC Information Services Group*          57
  4,800 Cerner Corp.*                            97
  2,700 Choicepoint, Inc.*                      162
  4,100 Clarify, Inc.*                          132
 13,400 CMGI, Inc.*                           1,389
  3,200 CNET, Inc.*                             346
  6,800 Concentric Network Corp.*               220
  2,500 Concord Communications, Inc.*           111
  9,600 CSG Systems International*              307
  2,900 Datastream Systems, Inc.*                35
  1,400 Deltek Systems, Inc.*                    13
  3,400 Dendrite International, Inc.*           112
</TABLE>
<TABLE>
<CAPTION>
 Shares Description                          Value
- ---------------------------------------------------
 <C>    <S>                                 <C>
  1,800 Dialogic Corp.*                     $    60
  2,400 Digi International, Inc.*                20
  2,300 Documentum, Inc.*                        32
  6,300 Doubleclick, Inc.*                      614
  3,100 Earthlink Network, Inc.*                166
  1,500 Engineering Animation, Inc.*             34
  6,423 Epicor Software Corp.                    45
  5,000 Excite, Inc.*                           665
  4,800 Exodus Communications, Inc.*            360
  1,900 Fair Issac & Company, Inc.*              62
  5,500 Filenet Corp.*                           54
  5,600 General Magic, Inc.*                     21
  1,700 Genesys Telecomm Labs, Inc.*             39
  1,600 Great Plaines Software, Inc.*            60
  5,200 GT Interactive Software Corp.*           21
  1,900 H.T.E., Inc.                              9
  5,775 Harbinger Corp.*                         64
  4,800 HNC Software*                           130
  5,685 Hyperion Solutions Corp.*                88
  1,800 IDX Systems Corp.*                       43
  2,200 IMRglobal Corp.*                         46
  5,900 Indus International, Inc.*               25
  4,800 Industri-Matematik International*        11
  5,200 Information Resources, Inc.*             44
 32,100 Informix Corp.*                         214
  4,500 Infoseek Corp.*                         188
  5,200 InfoUSA, Inc.*                           32
  8,900 Inprise Corp.*                           33
  1,950 Inspire Insurance Solutions, Inc*        34
  3,400 Integrated Systems, Inc.*                42
  3,800 Inter-Tel, Inc.*                         56
  3,700 JDA Software Group, Inc.*                33
  7,000 Legato Systems, Inc.*                   383
  8,050 Lycos, Inc.*                            809
  6,600 Macromedia Inc.*                        253
  3,600 Manugistics Group, Inc.*                 33
  3,100 Mapics, Inc.*                            29
  2,000 Medical Manager Corp.*                   99
  5,800 Mercury Interactive Corp.*              191
  1,200 Metro Information Services, Inc.*        28
  1,900 Micromuse, Inc.*                         76
  5,273 Midway Games, Inc.*                      56
  3,200 Mindspring Enterprises, Inc.*           237
    600 Mobius Management Systems, Inc.*          5
  6,300 National Data Corp.*                    296
  2,750 National Instruments Corp.              105
  3,700 Neomagic Corp.                           30
  1,500 Network Solutions, Inc.*                 95
  3,200 New ERA of Networks, Inc.*              142
  2,500 Objective Systems Integrator*             7
  4,200 Open Market, Inc.*                       52
  1,300 Pegasystems, Inc.*                       11
  3,300 Peregrine Systems, Inc.*                 76
  1,700 Pinnacle Systems, Inc.*                  88
</TABLE>

See accompanying notes to financial statements.

                                       69
<PAGE>

Northern Institutional Funds
Equity Portfolios
- --------------------------------------------------------------------------------
Statements of Investments
May 31, 1999
(All amounts in thousands, except shares)
(Unaudited)
<TABLE>
<CAPTION>
 Shares Description                             Value
- ------------------------------------------------------------
                    Small Company Index Portfolio--Continued
 <C>    <S>                                     <C>
 Software--Continued
  2,300 Preview Travel, Inc.*                   $   40
  3,200 Progress Software Corp.*                    83
  1,300 Project Software & Development*             37
  8,100 Psinet, Inc.*                              360
  1,600 QAD, Inc.*                                   6
  3,600 Quadramed Corp.                             37
 15,885 Rational Software Corp.*                   537
  3,300 RealNetworks, Inc.*                        234
  4,100 Remedy Corp.*                               78
  9,600 S3, Inc.                                    64
  5,700 Saga Systems, Inc.                          67
  1,100 Sanchez Computer Associates*                76
  2,000 SCB Computer Technology, Inc.*              13
  1,900 Schawk, Inc.*                               23
  2,400 SEI Investments Co.                        245
  2,900 Sportsline USA, Inc.*                      108
  1,700 SS&C Technologies, Inc.*                    21
  6,800 Structural Dynamics Research*              122
 15,300 Sybase, Inc.*                              148
 10,400 Symantec Corp.*                            255
  6,150 System Software Associates, Inc.*           12
  5,800 Transaction Systems Architects, Inc.*      185
  4,900 Vantive Corp.*                              53
  1,000 Verio, Inc.*                                54
  3,400 Viasoft, Inc.*                              13
  4,700 Visio Corp.*                               155
  3,900 Wavephore, Inc.*                            26
  6,137 Wind River Systems*                        129
                                                ------
                                                14,060
                                                ------
 Telecommunication Equipment--2.1%
  3,600 Adtran, Inc.*                               93
 21,940 American Tower Corp.*                      494
  4,400 Antec Corp.*                               129
  9,100 Aspect Telecommunications*                  77
  5,300 Associated Group, Inc.*                    344
  6,700 Cellnet Data Systems, Inc.*                 59
    900 Com21, Inc.*                                16
  7,400 Commscope, Inc.*                           194
  2,050 Davox Corp.*                                17
 11,500 Digital Microwave Corp.*                   145
  7,100 DSP Communications, Inc.*                  218
  1,000 Excel Switching Corp.*                      22
  3,500 Geotel Communications Corp.*               194
 11,600 Glenayre Technologies, Inc.*                41
  9,000 Interdigital Communications Corp.*          42
  9,500 Metromedia Fiber Network, Inc.*            384
  2,000 Natural Microsystems Corp.*                 12
  4,000 Network Equipment Technologies *            41
  2,800 North Pittsburgh Systems, Inc.              38
    500 Optical Cable Corp.*                         6
  8,100 P-Com, Inc.*                                36
  6,400 Pagemart Wireless, Inc.*                    30
 13,200 Pairgain Technologies, Inc.*               164
</TABLE>
<TABLE>
<CAPTION>
 Shares Description                              Value
- -------------------------------------------------------
 <C>    <S>                                      <C>
  7,500 Picturetel Corp.*                        $   67
  3,200 Plantronics, Inc.*                          196
    800 Powerwave Technologies, Inc.*                19
  4,500 Premisys Communications, Inc.*               39
 11,200 SkyTel Communications, Inc.*                227
  1,868 Superior Telecom, Inc.*                      55
  6,400 Tekelec*                                     65
  2,500 Westell Technologies, Inc.*                  17
  4,800 World Access, Inc.*                          55
                                                 ------
                                                  3,536
                                                 ------
 Telecommunications--3.0%
  2,400 Adaptive Broadband Corp.                     38
  2,300 Aerial Communications, Inc.*                 25
  5,100 Allen Telecom, Inc.                          53
  3,400 American Mobile Satellite Corp.*             49
  4,000 APAC Teleservices, Inc.*                     15
  1,700 AVT Corp.                                    57
  2,000 Cellular Communications of Puerto Rico       56
  3,400 Centennial Cellular Corp.*                  156
  3,900 Commnet Cellular, Inc.*                      78
  2,166 Commonwealth Telephone Enterprise*           85
  1,300 CoreComm Ltd.                                58
  2,300 Echostar Communications Corp.*              264
  1,600 Electric Lightwave, Inc.*                    19
  6,700 General Communication*                       33
  2,605 Hughes Electronics                          143
  8,600 ICG Communications, Inc.*                   164
  3,100 IDT Corp.*                                   69
  9,600 ITC Deltacom, Inc.*                         229
  5,100 IXC Communications, Inc.*                   184
  2,900 LCC International, Inc.*                     14
  2,300 Mastec, Inc.*                                56
  5,100 Metrocall, Inc.*                             15
    700 MGC Communications, Inc.*                    19
  4,300 MRV Communications, Inc.*                    50
  1,700 Norstan, Inc.*                               19
 11,233 NTL, Inc.*                                1,061
  5,700 Omnipoint Corp.*                             99
  1,500 Pacific Gateway Exchange, Inc.*              59
  4,300 PLD Telekom, Inc.*                           15
  2,900 Powertel, Inc.*                              73
  6,200 Premiere Technologies, Inc.*                 96
  6,400 RCN Corp.*                                  266
  4,200 Smartalk Teleservices, Inc.*                --
  4,000 Star Telecommunications, Inc.*               35
  5,700 Talk.com, Inc.                               59
  1,100 Telegroup, Inc.*                            --
  1,750 Transaction Network Services, Inc.*          47
  1,100 US LEC Corp.*                                22
    700 Verisign, Inc.                               83
 14,200 Voicestream Wireless Corp.                  388
  3,300 West Teleservices Corp.*                     25
 14,200 Western Wireless Corp., Class A*            348
  8,000 Winstar Communications, Inc.*               395
                                                 ------
                                                  5,019
                                                 ------
</TABLE>

See accompanying notes to financial statements.

                                       70
<PAGE>

- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 Shares Description                                     Value
- ---------------------------------------------------------------
 <C>    <S>                                            <C>
 Telephone--0.3%
  6,600 Aliant Communications, Inc.                    $    313
  2,400 CFW Communications Co.                               59
  9,000 e.spire Communications Inc.*                        103
  3,900 Primus Telecommunications*                           65
  3,300 USN Communications, Inc.*                            --
                                                       --------
                                                            540
                                                       --------
 Textiles--0.3%
 10,900 Collins & Aikman Corp.*                              61
  1,700 Culp, Inc.                                           14
  3,800 DAN River, Inc.*                                     35
  3,550 G & K Services, Inc.*                               168
  3,097 Guilford Mills, Inc.                                 31
  1,300 Pillowtex Corp.                                      21
  2,300 Quaker Fabric Corp.*                                 11
  2,000 Springs Industries, Inc.                             79
  1,600 Unifirst Corp.                                       29
                                                       --------
                                                            449
                                                       --------
 Tobacco--0.1%
    600 800-Jr Cigar, Inc.*                                   5
  8,300 Dimon, Inc.                                          44
  1,100 General Cigar Holdings, Inc.*                         9
  6,200 Universal Corp.                                     162
                                                       --------
                                                            220
                                                       --------
 Toys, Games & Hobbies--0.1%
  2,700 Action Performance Cos., Inc.*                      103
  3,400 Department 56*                                      113
  1,500 Marvel Enterprises, Inc.*                            13
    900 Media Arts Group, Inc.*                               6
     24 Score Board, Inc.                                    --
                                                       --------
                                                            235
                                                       --------
 Transportation--1.6%
  6,250 Air Express International CP                        156
  1,400 Airnet Systems, Inc.*                                15
  7,100 Alexander & Baldwin, Inc.                           161
  3,900 American Freightways Corp.*                          68
  3,600 Arnold Industries, Inc.                              59
  2,550 Atlas Air, Inc.*                                     68
  7,700 C.H. Robinson Worldwide, Inc.                       249
  2,400 Circle International Group                           50
  4,500 Coach USA, Inc.*                                    131
  3,900 Consolidated Freightways Corp.*                      52
  1,300 Covenant Transport, Inc.*                            16
  1,900 Dispatch Management Services Co.*                     5
  1,500 Eagle USA Airfreight, Inc.*                          71
  4,600 Expeditors International of Washington, Inc.        256
  2,100 Florida East Coast Industries                        73
  4,300 Fritz Cos., Inc.*                                    46
  1,100 Gulfmark Offshore, Inc.*                             18
  3,239 Heartland Express, Inc.*                             50
  4,000 Hunt (JB) Transport Services, Inc.                   67
</TABLE>
<TABLE>
<CAPTION>
 Shares Description                        Value
- --------------------------------------------------
 <C>    <S>                               <C>
  2,500 Hvide Marine, Inc.*               $      5
  3,700 Kirby Corp.                             70
  3,100 Kitty Hawk, Inc.*                       25
  1,100 Knight Transportation, Inc.*            22
  1,900 Landstar System, Inc.*                  71
  1,700 MS Carriers, Inc.*                      54
  4,000 Offshore Logistics                      45
  5,000 Overseas Shipholding Group              62
  3,900 Pittston Bax Group                      42
  2,900 Roadway Express, Inc.                   56
  6,875 Swift Transportation Co., Inc.*        126
  4,850 U.S. Freightways Corp.                 191
  1,400 US Xpress Enterprises, Inc.*            17
  5,312 Werner Enterprises, Inc.               103
  9,500 Wisconsin Central Transport*           188
  4,200 Yellow Corp.*                           71
                                          --------
                                             2,759
                                          --------
 Trucking & Leasing--0.2%
  1,600 Amerco, Inc.*                           40
  1,000 Greenbrier Co., Inc.                     9
  2,500 Interpool, Inc.                         31
  8,900 Rollins Truck Leasing Corp.             97
  3,200 Varlen Corp.                           121
  2,600 Xtra Corp.                             116
                                          --------
                                               414
                                          --------
 Water--0.3%
  2,150 Aquarion Co.                            67
  2,126 California Water Service Group          55
  1,600 E'Town Corp.                            68
  6,533 Philadelphia Suburban Corp.            144
  5,152 United Water Resources, Inc.           112
                                          --------
                                               446
- --------------------------------------------------
 TOTAL COMMON STOCKS (Cost $155,956)      $163,635
- --------------------------------------------------
 PREFERRED STOCKS--0.1%
 Diversified Financial Services--0.0%
  2,862 Superior Trust                    $    138
                                          --------
 Health Care--0.0%
    135 Mediq Co., Class A                       1
                                          --------
 Oil & Gas Services--0.0%
  1,100 Dril-Quip                               28
                                          --------
 Real Estate Investment Trusts--0.0%
  2,300 US Restaurants Properties, Inc.         49
- --------------------------------------------------
 TOTAL PREFERRED STOCKS (Cost $216)       $    216
- --------------------------------------------------
 RIGHTS--0.0%
  1,900 Smart & Final, Inc.*              $     --
    425 Talk.com, Inc.*                         --
  8,000 Homestead Village, Inc.*                --
  2,400 First Union Real Estate*                --
- --------------------------------------------------
 TOTAL RIGHTS (Cost $0)                   $     --
- --------------------------------------------------
</TABLE>

See accompanying notes to financial statements.

                                       71
<PAGE>

Northern Institutional Funds
Equity Portfolios
- --------------------------------------------------------------------------------
Statements of Investments
May 31, 1999
(All amounts in thousands, except shares)
(Unaudited)
<TABLE>
<CAPTION>


 Shares Description                                          Value
- --------------------------------------------------------------------
                    Small Company Index Portfolio--Continued
 <C>    <S>                                                 <C>
 WARRANTS--0.0%
    248 Corarm Healthcare Corp., Exp. 7/11/99*              $     --
    350 Milicom American Satellite Corp., Exp. 6/30/1999*         --
     57 PE Corp., Exp. 9/11/03*                                   --
- --------------------------------------------------------------------
 TOTAL WARRANTS (Cost $0)                                   $     --
- --------------------------------------------------------------------
 OTHER INVESTMENTS--0.0%
  2,000 Escrow CFS Group, Inc.*                             $     --
  1,400 Escrow Millicom, Inc.*                                    --
    900 Escrow Northeast Bancorp, Inc.*                           --
  1,420 Escrow Strawbridge & Clothier*                            --
- --------------------------------------------------------------------
 TOTAL OTHER INVESTMENTS (Cost $0)                          $     --
- --------------------------------------------------------------------
</TABLE>
<TABLE>
<CAPTION>

 Principal
  Amount   Description                   Value
- ------------------------------------------------
 <C>       <S>                          <C>
 SHORT-TERM INVESTMENTS--4.5%
           CDC Marches, Paris, France
 $7,083      4.875% Due 6/1/99          $  7,083
           U.S. Treasury Bill #
 $  670      4.34% Due 6/24/99               663
- ------------------------------------------------
 TOTAL SHORT-TERM INVESTMENTS--4.5%
  (Cost $7,746)                         $  7,746
- ------------------------------------------------
 TOTAL INVESTMENTS--99.8%
  (Cost $163,918)                       $171,597
- ------------------------------------------------
 Other assets, less liabilities--0.2%        243
- ------------------------------------------------
 NET ASSETS--100.0%                     $171,840
- ------------------------------------------------
- ------------------------------------------------
</TABLE>
OPEN FUTURES CONTRACTS:
<TABLE>
<CAPTION>
  Type of       Number of     Contract                   Contract      Unrealized
 Contracts      Contracts      Amount      Position     Expiration        Gain
- ---------------------------------------------------------------------------------
<S>             <C>           <C>          <C>          <C>            <C>
Russell 2000       34          $7,494        Long        6/18/99          $446
- ---------------------------------------------------------------------------------
</TABLE>

*Non-income producing security.

#Security pledged to cover margin requirements for open futures contracts.

See accompanying notes to financial statements.

                                       72
<PAGE>

Northern Institutional Funds
Equity Portfolios
- --------------------------------------------------------------------------------
Statements of Assets and Liabilities
May 31, 1999
(All amounts in thousands, except net asset value per share)
(Unaudited)

<TABLE>
<CAPTION>
                                                                                                    Small
                                   Diversified   Equity     Focused   International International  Company
                         Balanced    Growth      Index      Growth    Equity Index     Growth       Index
                         Portfolio  Portfolio  Portfolio   Portfolio    Portfolio     Portfolio   Portfolio
- -----------------------------------------------------------------------------------------------------------
<S>                      <C>       <C>         <C>         <C>        <C>           <C>           <C>
Assets:
Investments in
 securities, at cost      $61,424   $121,441   $  869,518  $114,254      $41,006      $103,852    $163,918
- -----------------------------------------------------------------------------------------------------------
Investments in
 securities, at value     $72,638   $186,146   $1,399,024  $163,585      $44,699      $109,912    $171,597
Cash and foreign
 currencies                 1,068      1,352       23,784       807          474           774          --
Receivables:
 Investment securities
  sold                      1,269      2,561          330     1,186           --         4,005         116
 Dividends and interest       463        130        2,410       104          137           563         148
 Foreign tax reclaims          --         --           --        --           43           180          --
 Fund shares sold               9         --          571     3,098            1           310         254
 Administrator                  7          6           39         7            7             6          20
Deferred organization
 costs, net                    --         --           --        --           10            --          --
Other assets                    3          4           34         3            6             5           6
- -----------------------------------------------------------------------------------------------------------
Total assets               75,457    190,199    1,426,192   168,790       45,377       115,755     172,141
- -----------------------------------------------------------------------------------------------------------
Liabilities:
Overdraft                      --         --           --        --           --            --         211
Payable for:
 Investment securities
  purchased                   961      1,231        1,845     3,924           --         1,461          --
 Fund shares redeemed          90          4        2,419        33           19            44          31
Accrued expenses:
 Advisory fees                 32         92          128       112           10            80          32
 Administration fees            6         17          128        14            6            15          16
 Custodian fees                 1          2           29         1            7            13          --
 Transfer agent fees            1          2           24         2           --             1           2
 Shareholder service
  fees                          1          1           --         7           --            --           2
Other liabilities              14         12          151        10            8             8           7
- -----------------------------------------------------------------------------------------------------------
Total liabilities           1,106      1,361        4,724     4,103           50         1,622         301
- -----------------------------------------------------------------------------------------------------------
Net assets                $74,351   $188,838   $1,421,468  $164,687      $45,327      $114,133    $171,840
- -----------------------------------------------------------------------------------------------------------
Analysis of net assets:
Paid-in capital           $56,533   $ 99,999     $824,014  $ 99,401      $41,684      $ 93,984    $157,718
Undistributed
 (distribution in
 excess of)
 net investment income        (39)       392         (983)     (267)        (285)       (1,006)      1,128
Accumulated net
 realized gains on
 investments, futures
 and foreign currency
 transactions               6,643     23,742       69,460    16,222          210        15,107       4,869
Net unrealized
 appreciation on
 investments, futures
 and foreign currency
 transactions              11,214     64,705      528,977    49,331        3,678         6,060       8,125
Net unrealized gains
 (losses) on
 translation of other
 assets and liabilities
 denominated in foreign
 currencies                    --         --           --        --           40           (12)         --
- -----------------------------------------------------------------------------------------------------------
Net assets                $74,351   $188,838   $1,421,468  $164,687      $45,327      $114,133    $171,840
- -----------------------------------------------------------------------------------------------------------
Total shares
 outstanding (no par
 value), unlimited
 shares authorized
 Class A                    5,077     10,623       54,350     8,591        3,890         9,646      13,552
 Class C                       57         --        4,771       557           --            --          29
 Class D                       36         19          703        46            1             1          44
- -----------------------------------------------------------------------------------------------------------
Net asset value,
 offering and
 redemption price per
 share
 Class A                  $ 14.38   $  17.75   $    23.77  $  17.92      $ 11.65      $  11.83    $  12.61
 Class C                  $ 14.40         --   $    23.71  $  17.84           --            --    $  12.58
 Class D                  $ 14.33   $  17.51   $    23.66  $  17.59      $ 11.62      $  11.69    $  12.52
- -----------------------------------------------------------------------------------------------------------
</TABLE>

See accompanying notes to financial statements.

                                       73
<PAGE>

Northern Institutional Funds
Equity Portfolios
- --------------------------------------------------------------------------------
Statements of Operations
For the Six Months Ended May 31, 1999
(All amounts in thousands)
(Unaudited)
<TABLE>
<CAPTION>
                                                                                                   Small
                                    Diversified  Equity     Focused  International International  Company
                          Balanced    Growth      Index     Growth   Equity Index     Growth       Index
                          Portfolio  Portfolio  Portfolio  Portfolio  Portfolio      Portfolio   Portfolio
- ----------------------------------------------------------------------------------------------------------
<S>                       <C>       <C>         <C>        <C>       <C>           <C>           <C>
Investment income:
Dividend                   $  189     $   915   $  9,632    $   528     $  474        $1,390      $ 1,375
Interest                      964         139        752         28          3           103          254
- ----------------------------------------------------------------------------------------------------------
Total income                1,153       1,054     10,384        556        477(a)      1,493(b)     1,629
- ----------------------------------------------------------------------------------------------------------
Expenses:
Investment advisory fees      286         776      2,156        841        114           561          395
Administration fees            36          97        719         77         35            84           99
Custodian fees                 12          14        119         14         39            68          209
Registration fees               8          13         52         11         12            11           29
Transfer agent fees             5          10        139         13          2             6           11
Professional fees               4           4         35          4          4             4            4
Shareholder servicing
 fees                           2           1        114          9         --            --            1
Trustee fees and ex-
 penses                         2           2         16          2          2             2            2
Amortization of deferred
 organization costs            --          --         --         --          2            --           --
Other                           4           9         39          6          4             8           44
- ----------------------------------------------------------------------------------------------------------
Total expenses                359         926      3,389        977        214           744          794
Less voluntary waivers
 of investment advisory
 fees                        (107)       (243)    (1,437)      (229)       (56)         (106)        (197)
Less expenses reimburs-
 able by Administrator        (30)        (39)      (259)       (35)       (39)          (37)        (241)
- ----------------------------------------------------------------------------------------------------------
Net expenses                  222         644      1,693        713        119           601          356
- ----------------------------------------------------------------------------------------------------------
Net investment income
 (loss)                       931         410      8,691       (157)       358           892        1,273
Net realized gains
 (losses) on:
 Investment transactions    6,658      23,452     71,168     16,428        387        16,159        4,766
 Futures transactions          --         630      3,055         --         --            --           63
 Foreign currency trans-
  actions                      --          --         --         --         (5)            6           --
Net change in unrealized
 appreciation
 (depreciation) on
 investments, futures,
 and foreign currency
 transactions              (2,886)     (3,453)    80,488      7,396        915        (7,210)      10,935
Net change in unrealized
 gains (losses) on
 translation of other
 assets and liabilities
 denominated in foreign
 currencies                    --          --         --         --         39           (52)          --
- ----------------------------------------------------------------------------------------------------------
Net increase in net
 assets resulting from
 operations                $4,703     $21,039   $163,402    $23,667     $1,694        $9,795      $17,037
- ----------------------------------------------------------------------------------------------------------
</TABLE>

(a) Net of $56 in non-reclaimable foreign withholding taxes.
(b) Net of $182 in non-reclaimable foreign withholding taxes.

See accompanying notes to financial statements.

                                       74
<PAGE>





                      [THIS PAGE INTENTIONALLY LEFT BLANK]




                                       75
<PAGE>

Northern Institutional Funds
Equity Portfolios
- --------------------------------------------------------------------------------
Statements of Changes in Net Assets
For the Six Months Ended May 31, 1999 (Unaudited) and the Year Ended November
30, 1998
(All amounts in thousands)
<TABLE>
<CAPTION>

                                              Balanced          Diversified
                                              Portfolio      Growth Portfolio
                                           ----------------  ------------------
                                            1999     1998      1999      1998
- --------------------------------------------------------------------------------
<S>                                        <C>      <C>      <C>       <C>
Increase (decrease) in net assets from
 operations:
 Net investment income (loss)              $   931  $ 1,670  $    410  $    734
 Net realized gains on investments, op-
  tions, futures and foreign currency
  transactions                               6,658    5,868    24,082    18,782
 Net change in unrealized appreciation
  (depreciation) on investments, options,
  futures and foreign currency
  transactions                              (2,886)   2,033    (3,453)   17,053
 Net change in unrealized gains (losses)
  on translations of other assets and li-
  abilities denominated in foreign cur-
  rencies                                       --       --        --        --
- --------------------------------------------------------------------------------
Net increase (decrease) in net assets re-
 sulting from operations                     4,703    9,571    21,039    36,569
- --------------------------------------------------------------------------------
Distributions to Class A shareholders:
 Net investment income                      (1,285)  (1,247)     (733)   (1,086)
 Net realized gains                         (5,339)  (1,990)  (18,907)  (18,075)
- --------------------------------------------------------------------------------
Total distributions to Class A sharehold-
 ers                                        (6,624)  (3,237)  (19,640)  (19,161)
- --------------------------------------------------------------------------------
Distributions to Class C shareholders:
 Net investment income                         (41)    (107)       --        --
 Net realized gains                           (473)    (174)       --        --
- --------------------------------------------------------------------------------
Total distributions to Class C sharehold-
 ers                                          (514)    (281)       --        --
- --------------------------------------------------------------------------------
Distributions to Class D shareholders:
 Net investment income                         (10)     (14)       (1)       (4)
 Net realized gains                            (66)     (29)     (124)     (104)
- --------------------------------------------------------------------------------
Total distributions to Class D sharehold-
 ers                                           (76)     (43)     (125)     (108)
- --------------------------------------------------------------------------------
Class A share transactions:
 Proceeds from the sale of shares           14,406   19,629     9,281    13,164
 Reinvested distributions                    6,606    3,204    18,539    18,263
 Cost of shares redeemed                    (7,682) (17,773)  (18,552)  (29,056)
- --------------------------------------------------------------------------------
Net increase (decrease) in net assets re-
 sulting from Class A share transactions    13,330    5,060     9,268     2,371
- --------------------------------------------------------------------------------
Class C share transactions:
 Proceeds from the sale of shares              285    1,465        --        --
 Reinvested distributions                      514      281        --        --
 Cost of shares redeemed                    (5,246)  (1,386)       --        --
- --------------------------------------------------------------------------------
Net increase (decrease) in net assets re-
 sulting from Class C share transactions    (4,447)     360        --        --
- --------------------------------------------------------------------------------
Class D share transactions:
 Proceeds from the sale of shares              149      618        69       511
 Reinvested distributions                       76       43       124       108
 Cost of shares redeemed                      (426)    (295)     (966)     (300)
- --------------------------------------------------------------------------------
Net increase (decrease) in net assets re-
 sulting from Class D share transactions      (201)     366      (773)      319
- --------------------------------------------------------------------------------
Net increase (decrease)                      6,171   11,796     9,769    19,990
Net assets--beginning of period             68,180   56,384   179,069   159,079
- --------------------------------------------------------------------------------
Net assets--end of period                  $74,351  $68,180  $188,838  $179,069
- --------------------------------------------------------------------------------
Undistributed (distribution in excess of)
 net investment income                     $   (39) $   366  $    392  $    716
- --------------------------------------------------------------------------------
</TABLE>


See accompanying notes to financial statements.

                                       76
<PAGE>

- --------------------------------------------------------------------------------




<TABLE>
<CAPTION>
                                              International
    Equity Index          Focused Growth      Equity Index       International       Small Company
      Portfolio              Portfolio          Portfolio      Growth Portfolio     Index Portfolio
- -----------------------  ------------------  ----------------  ------------------  ------------------
   1999         1998       1999      1998     1999     1998      1999      1998      1999      1998
- ------------------------------------------------------------------------------------------------------
<S>          <C>         <C>       <C>       <C>      <C>      <C>       <C>       <C>       <C>


$    8,691   $   15,089  $   (157) $    (87) $   358  $   638  $    892  $    959  $  1,273  $  1,470


    74,223       83,021    16,428    10,166      382    1,818    16,165     9,825     4,829    22,845



    80,488      132,779     7,396    17,953      915    4,011    (7,210)    8,909    10,935   (28,927)



        --           --        --        --       39        4       (52)       46        --        --
- ------------------------------------------------------------------------------------------------------

   163,402      230,889    23,667    28,032    1,694    6,471     9,795    19,739    17,037    (4,612)
- ------------------------------------------------------------------------------------------------------

   (10,417)     (12,617)       --      (321)    (885)    (678)   (2,013)   (1,630)   (1,491)   (1,365)
   (75,449)     (64,765)   (9,490)  (20,346)  (2,016)      --    (6,897)   (5,679)  (23,084)   (8,892)
- ------------------------------------------------------------------------------------------------------

   (85,866)     (77,382)   (9,490)  (20,667)  (2,901)    (678)   (8,910)   (7,309)  (24,575)  (10,257)
- ------------------------------------------------------------------------------------------------------

      (747)      (1,037)       --        (5)      --       --        --        --        --        --
    (6,898)      (5,908)     (674)   (1,471)      --       --        --        --       (13)       --
- ------------------------------------------------------------------------------------------------------

    (7,645)      (6,945)     (674)   (1,476)      --       --        --        --       (13)       --
- ------------------------------------------------------------------------------------------------------

      (112)        (298)       --        (1)      --       --        (2)       (3)       (3)       (5)
    (1,990)      (2,272)     (136)     (270)      (1)      --       (12)      (15)      (96)      (43)
- ------------------------------------------------------------------------------------------------------

    (2,102)      (2,570)     (136)     (271)      (1)      --       (14)      (18)      (99)      (48)
- ------------------------------------------------------------------------------------------------------

   255,269      512,427    20,713    20,270    3,057   22,035     5,515     9,817   117,213    99,274
    72,451       68,757     9,041    19,625    2,858      649     7,690     6,291    22,577     9,261
  (272,726)    (376,883)  (11,621)  (37,427)  (4,333) (17,779)  (11,550)  (23,669) (100,387) (102,546)
- ------------------------------------------------------------------------------------------------------

    54,994      204,301    18,133     2,468    1,582    4,905     1,655    (7,561)   39,403     5,989
- ------------------------------------------------------------------------------------------------------

    19,178       44,422       685       178       --       --        --        --       889     2,017
     7,645        6,945       674     1,476       --       --        --        --        13        --
   (30,877)     (35,066)     (955)   (1,678)      --       --        --        --    (1,391)   (1,148)
- ------------------------------------------------------------------------------------------------------

    (4,054)      16,301       404       (24)      --       --        --        --      (489)      869
- ------------------------------------------------------------------------------------------------------

     3,549       10,633        55       770       --       10         7       162        59       544
     2,081        2,526        80       271        1       --        15        17        99        48
   (21,697)     (16,644)   (1,230)     (558)      --       --      (212)     (241)     (407)     (285)
- ------------------------------------------------------------------------------------------------------

   (16,067)      (3,485)   (1,095)      483        1       10      (190)      (62)     (249)      307
- ------------------------------------------------------------------------------------------------------
   102,662      361,109    30,809     8,545      375   10,708     2,336     4,789    31,015    (7,752)
 1,318,806      957,697   133,878   125,333   44,952   34,244   111,797   107,008   140,825   148,577
- ------------------------------------------------------------------------------------------------------
$1,421,468   $1,318,806  $164,687  $133,878  $45,327  $44,952  $114,133  $111,797  $171,840  $140,825
- ------------------------------------------------------------------------------------------------------

$     (983)  $    1,602  $   (267) $   (110) $  (285) $   242  $ (1,006) $    117  $  1,128  $  1,349
- ------------------------------------------------------------------------------------------------------
</TABLE>

                                       77
<PAGE>

Northern Institutional Funds
Equity Portfolios
- -------------------------------------------------------------------------------
Financial Highlights
For the Six Months Ended May 31, 1999 (Unaudited) and the Years Ended November
30,
Balanced Portfolio

<TABLE>
<CAPTION>
                                              Class A
                          ----------------------------------------------------
                           1999     1998     1997     1996     1995     1994
- --------------------------------------------------------------------------------
<S>                       <C>      <C>      <C>      <C>      <C>      <C>
Net asset value, begin-
 ning of period           $ 14.95  $ 13.59  $ 12.24  $ 11.05  $  9.50  $ 10.22
Income (Loss) from in-
 vestment operations:
 Net investment income       0.19     0.38     0.38     0.34     0.34     0.24
 Net realized and
  unrealized gain (loss)     0.03     1.81     1.66     1.19     1.55    (0.72)
- --------------------------------------------------------------------------------
Total income from in-
 vestment operations         0.22     2.19     2.04     1.53     1.89    (0.48)
- --------------------------------------------------------------------------------
Distributions to share-
 holders:
 Net investment income      (0.28)   (0.32)   (0.38)   (0.34)   (0.34)   (0.22)
 Net realized gain          (0.51)   (0.51)   (0.31)      --       --    (0.02)
- --------------------------------------------------------------------------------
Total distributions to
 shareholders               (0.79)   (0.83)   (0.69)   (0.34)   (0.34)   (0.24)
- --------------------------------------------------------------------------------
Net increase (decrease)     (0.57)    1.36     1.35     1.19     1.55    (0.72)
- --------------------------------------------------------------------------------
Net asset value, end of
 period                   $ 14.38  $ 14.95  $ 13.59  $ 12.24  $ 11.05  $  9.50
- --------------------------------------------------------------------------------
Total return (a)             7.06%   16.90%   17.29%   14.07%   20.22%   (4.76)%
Ratio to average net as-
 sets of (b):
 Expenses, net of waiv-
  ers and reimbursements     0.61%    0.61%    0.61%    0.61%    0.61%    0.61%
 Expenses, before waiv-
  ers and reimbursements     1.00%    1.04%    1.11%    1.20%    1.28%    1.50%
 Net investment income,
  net of waivers and re-
  imbursements               2.61%    2.83%    2.99%    3.03%    3.36%    2.56%
 Net investment income,
  before waivers and re-
  imbursements               2.22%    2.40%    2.49%    2.44%    2.69%    1.68%
Portfolio turnover rate     41.89%   67.16%   59.06%  104.76%   93.39%   75.69%
Net assets at end of pe-
 riod (in thousands)      $73,013  $61,969  $51,475  $45,157  $38,897  $31,462
- --------------------------------------------------------------------------------
</TABLE>

<TABLE>
<CAPTION>
                                      Class C                          Class D
                          --------------------------------- --------------------------------
                          1999 (c)  1998    1997   1996 (d)  1999    1998    1997   1996 (e)
- --------------------------------------------------------------------------------------------
<S>                       <C>      <C>     <C>     <C>      <C>     <C>     <C>     <C>
Net asset value, begin-
 ning of period            $14.91  $13.56  $12.24   $11.12  $14.88  $13.54  $12.23   $11.34
Income (loss) from in-
 vestment operations:
 Net investment income       0.20    0.37    0.36     0.29    0.15    0.40    0.34     0.22
 Net realized and
  unrealized gain (loss)     0.03    1.78    1.64     1.12    0.09    1.72    1.64     0.96
- --------------------------------------------------------------------------------------------
Total income from in-
 vestment operations         0.23    2.15    2.00     1.41    0.24    2.12    1.98     1.18
- --------------------------------------------------------------------------------------------
Distributions to share-
 holders:
 Net investment income      (0.23)  (0.29)  (0.37)   (0.29)  (0.28)  (0.27)  (0.36)   (0.29)
 Net realized gain          (0.51)  (0.51)  (0.31)      --   (0.51)  (0.51)  (0.31)      --
- --------------------------------------------------------------------------------------------
Total distributions to
 shareholders               (0.74)  (0.80)  (0.68)   (0.29)  (0.79)  (0.78)  (0.67)   (0.29)
- --------------------------------------------------------------------------------------------
Net increase (decrease)     (0.51)   1.35    1.32     1.12   (0.55)   1.34    1.31     0.89
- --------------------------------------------------------------------------------------------
Net asset value, end of
 period                    $14.40  $14.91  $13.56   $12.24  $14.33  $14.88  $13.54   $12.23
- --------------------------------------------------------------------------------------------
Total return (a)             7.12%  16.61%  17.00%   12.72%   6.92%  16.45%  16.82%   10.55%
Ratio to average net as-
 sets of (b):
 Expenses, net of waiv-
  ers and reimbursements     0.85%   0.85%   0.85%    0.85%   1.00%   1.00%   1.00%    1.00%
 Expenses, before waiv-
  ers and reimbursements     1.24%   1.28%   1.35%    1.44%   1.39%   1.43%   1.50%    1.59%
 Net investment income,
  net of waivers and re-
  imbursements               2.37%   2.58%   2.75%    2.80%   2.22%   2.44%   2.60%    2.78%
 Net investment income,
  before waivers and re-
  imbursements               1.98%   2.15%   2.25%    2.21%   1.83%   2.01%   2.10%    2.19%
Portfolio turnover rate     41.89%  67.16%  59.06%  104.76%  41.89%  67.16%  59.06%  104.76%
Net assets at end of pe-
 riod (in thousands)       $  816  $5,459  $4,587   $5,997  $  522  $  752  $  322   $  232
- --------------------------------------------------------------------------------------------
</TABLE>

(a) Assumes investment at net asset value at the beginning of the period,
    reinvestment of all dividends and distributions, and a complete redemption
    of the investment at the net asset value at the end of the period. Total
    return is not annualized for periods less than one year.
(b) Annualized for periods less than a full year.
(c) Financial highlights for the six months ended May 31, 1999 were calculated
    using average shares outstanding for the period.
(d) For the period December 29, 1995 (Class C shares issue date) through
    November 30, 1996.
(e) For the period February 20, 1996 (Class D shares issue date) through
    November 30, 1996.



See accompanying notes to financial statements.

                                      78
<PAGE>

Northern Institutional Funds
Equity Portfolios
- -------------------------------------------------------------------------------
Financial Highlights
For the Six Months Ended May 31, 1999 (Unaudited) and the Years Ended November
30,
Diversified Growth Portfolio
<TABLE>
<CAPTION>
                                                 Class A
                          ----------------------------------------------------------
                            1999      1998      1997      1996      1995      1994
- --------------------------------------------------------------------------------------
<S>                       <C>       <C>       <C>       <C>       <C>       <C>
Net asset value,
 beginning of period      $  17.76  $  16.20  $  14.36  $  12.20  $   9.88  $  10.65
Income (loss) from
 investment operations:
 Net investment income        0.04      0.07      0.11      0.14      0.15      0.09
 Net realized and
  unrealized gain (loss)      1.94      3.46      3.33      2.33      2.26     (0.83)
- --------------------------------------------------------------------------------------
Total income (loss) from
 investment operations        1.98      3.53      3.44      2.47      2.41     (0.74)
- --------------------------------------------------------------------------------------
Distributions to share-
 holders:
 Net investment income       (0.07)    (0.11)    (0.14)    (0.15)    (0.09)    (0.01)
 Net realized gain           (1.92)    (1.86)    (1.46)    (0.16)       --     (0.02)
- --------------------------------------------------------------------------------------
Total distributions to
 shareholders                (1.99)    (1.97)    (1.60)    (0.31)    (0.09)    (0.03)
- --------------------------------------------------------------------------------------
Net increase (decrease)      (0.01)     1.56      1.84      2.16      2.32     (0.77)
- --------------------------------------------------------------------------------------
Net asset value, end of
 period                   $  17.75  $  17.76  $  16.20  $  14.36  $  12.20  $   9.88
- --------------------------------------------------------------------------------------
Total return (a)             11.81%    25.22%    27.06%    20.83%    24.55%    (6.98)%
Ratio to average net as-
 sets of (b):
 Expenses, net of
  waivers and
  reimbursements              0.66%     0.66%     0.67%     0.66%     0.69%     0.67%
 Expenses, before
  waivers and
  reimbursements              0.95%     0.96%     1.03%     1.10%     1.12%     1.08%
 Net investment income,
  net of waivers and
  reimbursements              0.42%     0.45%     0.76%     0.98%     1.16%     0.77%
 Net investment income,
  before waivers and
  reimbursements              0.13%     0.15%     0.40%     0.54%     0.73%     0.35%
Portfolio turnover rate      30.62%    37.74%    45.53%    59.99%    81.65%    78.94%
Net assets at end of pe-
 riod (in thousands)      $188,512  $177,947  $158,383  $142,055  $146,731  $164,963
- --------------------------------------------------------------------------------------
</TABLE>
<TABLE>
<CAPTION>
                                               Class D
                             --------------------------------------------------
                             1999 (c)   1998     1997    1996    1995   1994(d)
- --------------------------------------------------------------------------------
<S>                          <C>       <C>      <C>     <C>     <C>     <C>
Net asset value, beginning
 of period                    $17.53   $16.03   $14.26  $12.16  $ 9.88  $10.41
Income (loss) from
 investment operations:
 Net investment income
  (loss)                        0.02     0.03     0.09    0.11    0.11    0.01
 Net realized and
  unrealized gain (loss)        1.89     3.40     3.27    2.29    2.25   (0.54)
- --------------------------------------------------------------------------------
Total income (loss) from
 investment operations          1.91     3.43     3.36    2.40    2.36   (0.53)
- --------------------------------------------------------------------------------
Distributions to sharehold-
 ers:
 Net investment income         (0.01)   (0.07)   (0.13)  (0.14)  (0.08)     --
 Net realized gain             (1.92)   (1.86)   (1.46)  (0.16)     --      --
- --------------------------------------------------------------------------------
Total distributions to
 shareholders                  (1.93)   (1.93)   (1.59)  (0.30)  (0.08)     --
- --------------------------------------------------------------------------------
Net increase (decrease)        (0.02)    1.50     1.77    2.10    2.28   (0.53)
- --------------------------------------------------------------------------------
Net asset value, end of pe-
 riod                         $17.51   $17.53   $16.03  $14.26  $12.16  $ 9.88
- --------------------------------------------------------------------------------
Total return (a)               11.48%   24.73%   26.60%  20.39%  24.19%  (5.14)%
Ratio to average net assets
 of (b):
 Expenses, net of waivers
  and reimbursements            1.05%    1.05%    1.06%   1.05%   1.08%   1.05%
 Expenses, before waivers
  and reimbursements            1.34%    1.35%    1.42%   1.49%   1.51%   1.46%
 Net investment income, net
  of waivers and
  reimbursements                0.03%    0.06%    0.37%   0.59%   0.73%   0.94%
 Net investment income
  (loss), before waivers
  and reimbursements           (0.26)%  (0.24)%   0.01%   0.15%   0.30%   0.53%
Portfolio turnover rate        30.62%   37.74%   45.53%  59.99%  81.65%  78.94%
Net assets at end of period
 (in thousands)               $  327   $1,122   $  696  $  433  $  221  $   40
- --------------------------------------------------------------------------------
</TABLE>

(a) Assumes investment at net asset value at the beginning of the period,
    reinvestment of all dividends and distributions, and a complete redemption
    of the investment at the net asset value at the end of the period. Total
    return is not annualized for periods less than one year.
(b) Annualized for periods less than a full year.
(c) Financial highlights for the six months ended May 31, 1999 were calculated
    using average shares outstanding for the period.
(d) For the period September 14, 1994 (Class D shares issue date) through
    November 30, 1994.

See accompanying notes to financial statements.

                                      79
<PAGE>

Northern Institutional Funds
Equity Portfolios
- --------------------------------------------------------------------------------
Financial Highlights
For the Six Months Ended May 31, 1999 (Unaudited) and the Years Ended November
30,
Equity Index Portfolio
<TABLE>
<CAPTION>
                                                  Class A
                         --------------------------------------------------------------
                            1999        1998       1997      1996      1995      1994
- ----------------------------------------------------------------------------------------
<S>                      <C>         <C>         <C>       <C>       <C>       <C>
Net asset value,
 beginning of period     $    22.69  $    20.09  $  16.79  $  13.86  $  10.60  $  10.78
 Income (loss) from
  investment operations:
 Net investment income         0.14        0.28      0.30      0.31      0.30      0.27
 Net realized and
  unrealized gain (loss)       2.56        4.02      4.13      3.36      3.47     (0.18)
- ----------------------------------------------------------------------------------------
Total income from
 investment operations         2.70        4.30      4.43      3.67      3.77      0.09
- ----------------------------------------------------------------------------------------
Distributions to
 shareholders:
 Net investment income        (0.19)      (0.26)    (0.30)    (0.31)    (0.30)    (0.27)
 Net realized gain            (1.43)      (1.44)    (0.83)    (0.43)    (0.21)      --
- ----------------------------------------------------------------------------------------
Total distributions to
 shareholders                 (1.62)      (1.70)    (1.13)    (0.74)    (0.51)    (0.27)
- ----------------------------------------------------------------------------------------
Net increase (decrease)        1.08        2.60      3.30      2.93      3.26     (0.18)
- ----------------------------------------------------------------------------------------
Net asset value, end of
 period                  $    23.77  $    22.69  $  20.09  $  16.79  $  13.86  $  10.60
- ----------------------------------------------------------------------------------------
Total return (a)              12.45%      23.39%    27.93%    27.53%    36.60%     0.87%
Ratio to average net
 assets of (b):
 Expenses, net of
  waivers and
  reimbursements               0.21%       0.21%     0.22%     0.22%     0.22%     0.23%
 Expenses, before
  waivers and
  reimbursements               0.44%       0.46%     0.46%     0.50%     0.54%     0.59%
 Net investment income,
  net of waivers and
  reimbursements               1.24%       1.36%     1.66%     2.12%     2.54%     2.62%
 Net investment income,
  before waivers and
  reimbursements               1.01%       1.11%     1.42%     1.84%     2.22%     2.25%
Portfolio turnover rate        4.77%      15.26%    18.96%    18.02%    15.27%    71.98%
Net assets at end of
 period (in thousands)   $1,291,723  $1,175,112  $844,065  $675,804  $479,763  $281,817
- ----------------------------------------------------------------------------------------
</TABLE>

<TABLE>
<CAPTION>
                                           Class C                                           Class D
                          ----------------------------------------------  --------------------------------------------------
                            1999      1998     1997     1996    1995 (c)   1999     1998     1997     1996    1995   1994(d)
- -----------------------------------------------------------------------------------------------------------------------------
<S>                       <C>       <C>       <C>      <C>      <C>       <C>      <C>      <C>      <C>     <C>     <C>
Net asset value,
 beginning of period      $  22.64  $  20.05  $ 16.79  $ 13.86  $ 13.43   $ 22.58  $ 20.00  $ 16.77  $13.83  $10.60  $10.96
 Income (loss) from
  investment operations:
 Net investment income        0.12      0.24     0.26     0.28     0.05      0.08     0.21     0.26    0.27    0.25    0.02
 Net realized and
  unrealized gain (loss)      2.54      4.01     4.11     3.35     0.45      2.55     4.00     4.07    3.36    3.47   (0.31)
- -----------------------------------------------------------------------------------------------------------------------------
Total income (loss) from
 investment operations        2.66      4.25     4.37     3.63     0.50      2.63     4.21     4.33    3.63    3.72   (0.29)
- -----------------------------------------------------------------------------------------------------------------------------
Distributions to
 shareholders:
 Net investment income       (0.16)    (0.22)   (0.28)   (0.27)   (0.07)    (0.12)   (0.19)   (0.27)  (0.26)  (0.28)  (0.07)
 Net realized gain           (1.43)    (1.44)   (0.83)   (0.43)      --     (1.43)   (1.44)   (0.83)  (0.43)  (0.21)    --
- -----------------------------------------------------------------------------------------------------------------------------
Total distributions to
 shareholders                (1.59)    (1.66)   (1.11)   (0.70)   (0.07)    (1.55)   (1.63)   (1.10)  (0.69)  (0.49)  (0.07)
- -----------------------------------------------------------------------------------------------------------------------------
Net increase (decrease)       1.07      2.59     3.26     2.93     0.43      1.08     2.58     3.23    2.94    3.23   (0.36)
- -----------------------------------------------------------------------------------------------------------------------------
Net asset value, end of
 period                   $  23.71  $  22.64  $ 20.05  $ 16.79  $ 13.86   $ 23.66  $ 22.58  $ 20.00  $16.77  $13.83  $10.60
- -----------------------------------------------------------------------------------------------------------------------------
Total return (a)             12.28%    23.09%   27.64%   27.24%    3.94%    12.18%   22.90%   27.45%  27.20%  36.20%  (2.68)%
Ratio to average net
 assets of (b):
 Expenses, net of
  waivers and
  reimbursements              0.45%     0.45%    0.46%    0.46%    0.46%     0.60%    0.60%    0.61%   0.61%   0.61%   0.60%
 Expenses, before
  waivers and
  reimbursements              0.68%     0.70%    0.70%    0.74%    0.78%     0.83%    0.85%    0.85%   0.89%   0.93%   0.96%
 Net investment income,
  net of waivers and
  reimbursements              1.00%     1.12%    1.42%    1.89%    2.29%     0.85%    0.97%    1.27%   1.78%   2.07%   2.67%
 Net investment income,
  before waivers and
  reimbursements              0.77%     0.87%    1.18%    1.61%    1.97%     0.62%    0.72%    1.03%   1.50%   1.75%   2.31%
Portfolio turnover rate       4.77%    15.26%   18.96%   18.02%   15.27%     4.77%   15.26%   18.96%  18.02%  15.27%  71.98%
Net assets at end of
 period (in thousands)    $113,100  $111,991  $82,982  $53,929  $18,390   $16,645  $31,703  $30,650  $8,005  $  810  $    3
- -----------------------------------------------------------------------------------------------------------------------------
</TABLE>

(a) Assumes investment at net asset value at the beginning of the period,
    reinvestment of all dividends and distributions, and a complete redemption
    of the investment at the net asset value at the end of the period. Total
    return is not annualized for periods less than one year.
(b) Annualized for periods less than a full year.
(c) For the period September 28, 1995 (Class C shares issue date) through
    November 30, 1995.
(d) For the period September 14, 1994 (Class D shares issue date) through
    November 30, 1994.

See accompanying notes to financial statements.

                                       80
<PAGE>

Northern Institutional Funds
Equity Portfolios
- -------------------------------------------------------------------------------
Financial Highlights
For the Six Months Ended May 31, 1999 (Unaudited) and the Years Ended November
30,
Focused Growth Portfolio
<TABLE>
<CAPTION>
                                                Class A
                          -------------------------------------------------------------
                            1999       1998       1997       1996      1995      1994
- -----------------------------------------------------------------------------------------
<S>                       <C>        <C>        <C>        <C>        <C>       <C>
Net asset value,
 beginning of period      $  16.39   $  16.20   $  14.48   $  12.53   $  9.79   $ 10.43
Income (loss) from
 investment operations:
 Net investment income
  (loss)                     (0.01)     (0.01)      0.05       0.02      0.05      0.02
 Net realized and
  unrealized gain (loss)      2.80       3.10       3.37       2.17      2.71     (0.66)
- -----------------------------------------------------------------------------------------
Total income (loss) from
 investment operations        2.79       3.09       3.42       2.19      2.76     (0.64)
- -----------------------------------------------------------------------------------------
Distributions to share-
 holders:
 Net investment income          --      (0.05)     (0.02)     (0.05)    (0.02)       --
 Net realized gain           (1.26)     (2.85)     (1.68)     (0.19)       --        --
- -----------------------------------------------------------------------------------------
Total distributions to
 shareholders                (1.26)     (2.90)     (1.70)     (0.24)    (0.02)       --
- -----------------------------------------------------------------------------------------
Net increase (decrease)       1.53       0.19       1.72       1.95      2.74     (0.64)
- -----------------------------------------------------------------------------------------
Net asset value, end of
 period                   $  17.92   $  16.39   $  16.20   $  14.48   $ 12.53   $  9.79
- -----------------------------------------------------------------------------------------
Total return (a)             17.86%     24.03%     27.05%     17.82%    28.38%    (6.15)%
Ratio to average net as-
 sets of (b):
 Expenses, net of
  waivers and
  reimbursements              0.91%      0.92%      0.92%      0.91%     0.91%     0.91%
 Expenses, before
  waivers and
  reimbursements              1.26%      1.29%      1.34%      1.43%     1.47%     1.55%
 Net investment income
  (loss), net of waivers
  and reimbursements         (0.19)%    (0.04)%     0.30%      0.12%     0.46%     0.24%
 Net investment loss,
  before waivers and
  reimbursements             (0.54)%    (0.41)%    (0.12)%    (0.40)%   (0.10)%   (0.39)%
Portfolio turnover rate      48.67%     79.11%    108.29%    116.78%    85.93%    74.28%
Net assets at end of
 period (in thousands)    $153,927   $123,380   $115,802   $106,250   $86,099   $57,801
- -----------------------------------------------------------------------------------------
</TABLE>

<TABLE>
<CAPTION>
                                      Class C                                     Class D
                          -------------------------------------   -----------------------------------------------
                           1999     1998      1997     1996 (c)    1999     1998      1997      1996     1995 (d)
- ------------------------------------------------------------------------------------------------------------------
<S>                       <C>      <C>       <C>       <C>        <C>      <C>       <C>       <C>       <C>
Net asset value,
 beginning of period      $16.34   $ 16.16   $ 14.47   $ 13.46    $16.14   $ 16.01   $ 14.37   $ 12.48    $ 9.55
Income (loss) from
 investment operations:
 Net investment income
  (loss)                   (0.03)    (0.05)     0.01     (0.01)    (0.10)    (0.05)     0.03     (0.03)     0.02
 Net realized and
  unrealized gain           2.79      3.09      3.37      1.02      2.81      3.04      3.30      2.15      2.93
- ------------------------------------------------------------------------------------------------------------------
Total income from in-
 vestment operations        2.76      3.04      3.38      1.01      2.71      2.99      3.33      2.12      2.95
- ------------------------------------------------------------------------------------------------------------------
Distributions to share-
 holders:
 Net investment income        --     (0.01)    (0.01)       --        --     (0.01)    (0.01)    (0.04)    (0.02)
 Net realized gain         (1.26)    (2.85)    (1.68)       --     (1.26)    (2.85)    (1.68)    (0.19)       --
- ------------------------------------------------------------------------------------------------------------------
Total distributions to
 shareholders              (1.26)    (2.86)    (1.69)       --     (1.26)    (2.86)    (1.69)    (0.23)    (0.02)
- ------------------------------------------------------------------------------------------------------------------
Net increase                1.50      0.18      1.69      1.01      1.45      0.13      1.64      1.89      2.93
- ------------------------------------------------------------------------------------------------------------------
Net asset value, end of
 period                   $17.84   $ 16.34   $ 16.16   $ 14.47    $17.59   $ 16.14   $ 16.01   $ 14.37    $12.48
- ------------------------------------------------------------------------------------------------------------------
Total return (a)           17.78%    23.73%    26.75%     7.51%    17.62%    23.60%    26.52%    17.42%    30.97%
Ratio to average net as-
 sets of (b):
 Expenses, net of
  waivers and
  reimbursements            1.15%     1.16%     1.16%     1.15%     1.30%     1.31%     1.31%     1.30%     1.30%
 Expenses, before
  waivers and
  reimbursements            1.50%     1.53%     1.58%     1.67%     1.65%     1.68%     1.73%     1.82%     1.86%
 Net investment income
  (loss), net of waivers
  and reimbursements       (0.43)%   (0.29)%    0.06%    (0.12)%   (0.58)%   (0.44)%   (0.09)%   (0.28)%   (0.11)%
 Net investment loss,
  before waivers and
  reimbursements           (0.78)%   (0.66)%   (0.36)%   (0.64)%   (0.93)%   (0.81)%   (0.51)%   (0.80)%   (0.67)%
Portfolio turnover rate    48.67%    79.11%   108.29%   116.78%    48.67%    79.11%   108.29%   116.78%    85.93%
Net assets at end of pe-
 riod (in thousands)      $9,948   $ 8,719   $ 8,325   $ 6,993    $  812   $ 1,779   $ 1,206   $   656    $  489
- ------------------------------------------------------------------------------------------------------------------
</TABLE>

(a) Assumes investment at net asset value at the beginning of the period,
    reinvestment of all dividends and distributions, and a complete redemption
    of the investment at the net asset value at the end of the period. Total
    return is not annualized for periods less than one year.
(b) Annualized for periods less than a full year.
(c) For the period June 14, 1996 (Class C shares issue date) through November
    30, 1996.
(d) For the period December 8, 1994 (Class D shares issue date) through
    November 30, 1995.

See accompanying notes to financial statements.

                                      81
<PAGE>

Northern Institutional Funds
Equity Portfolios
- -------------------------------------------------------------------------------
Financial Highlights
For the Six Months Ended May 31, 1999 (Unaudited) and the Years Ended November
30,
International Equity Index Portfolio
<TABLE>
<CAPTION>
                                                     Class A
                                             --------------------------
                                              1999     1998    1997 (a)
- -----------------------------------------------------------------------
<S>                                          <C>      <C>      <C>
Net asset value, beginning of period         $ 11.98  $ 10.55  $ 10.00
Income from investment operations:
 Net investment income                          0.10     0.14     0.10
 Net realized and unrealized gain               0.35     1.46     0.45
- -----------------------------------------------------------------------
Total income from investment operations         0.45     1.60     0.55
- -----------------------------------------------------------------------
Distributions to shareholders:
 Net investment income                         (0.24)   (0.17)      --
 Net realized gain                             (0.54)      --       --
- -----------------------------------------------------------------------
Total distributions to shareholders            (0.78)   (0.17)      --
- -----------------------------------------------------------------------
Net increase (decrease)                        (0.33)    1.43     0.55
- -----------------------------------------------------------------------
Net asset value, end of period               $ 11.65  $ 11.98  $ 10.55
- -----------------------------------------------------------------------
Total return (b)                                3.84%   15.50%    5.45%
Ratio to average net assets of (c):
 Expenses, net of waivers and reimbursements    0.52%    0.55%    0.51%
 Expenses, before waivers and reimbursements    0.93%    1.00%    1.08%
 Net investment income, net of waivers and
  reimbursements                                1.54%    1.36%    1.75%
 Net investment income, before waivers and
  reimbursements                                1.13%    0.91%    1.18%
Portfolio turnover rate                         8.71%   41.53%    8.16%
Net assets at end of period (in thousands)   $45,315  $44,940  $34,244
- -----------------------------------------------------------------------
</TABLE>

<TABLE>
<CAPTION>
                                                      Class D
                                                  -----------------
                                                   1999    1998 (d)
- --------------------------------------------------------------------
<S>                                               <C>      <C>
Net asset value, beginning of period              $ 11.97   $ 9.88
Income from investment operations:
 Net investment income                               0.08       --
 Net realized and unrealized gain                    0.34     2.09
- --------------------------------------------------------------------
Total income from investment operations              0.42     2.09
- --------------------------------------------------------------------
Distributions to shareholders:
 Net investment income                              (0.23)      --
 Net realized gain                                  (0.54)      --
- --------------------------------------------------------------------
Total distributions to shareholders                 (0.77)      --
- --------------------------------------------------------------------
Net increase (decrease)                             (0.35)    2.09
- --------------------------------------------------------------------
Net asset value, end of period                    $ 11.62  $ 11.97
- --------------------------------------------------------------------
Total return (b)                                     3.61%   21.15 %
Ratio to average net assets of (c):
 Expenses, net of waivers and reimbursements         0.91%    0.94 %
 Expenses, before waivers and reimbursements         1.32%    1.39 %
 Net investment income (loss), net of waivers and
  reimbursements                                     1.15%   (0.11)%
 Net investment income (loss), before waivers and
  reimbursements                                     0.74%   (0.56)%
Portfolio turnover rate                              8.71%   41.53 %
Net assets at end of period (in thousands)        $    12  $    12
- --------------------------------------------------------------------
</TABLE>

(a) For the period April 1, 1997 (commencement of operations) through November
    30, 1997.
(b) Assumes investment at net asset value at the beginning of the period,
    reinvestment of all dividends and distributions, and a complete redemption
    of the investment at the net asset value at the end of the period. Total
    return is not annualized for periods less than one year.
(c) Annualized for periods less than a full year.
(d) For the period October 5, 1998 (Class D shares issue date) through
    November 30, 1998.

See accompanying notes to financial statements.

                                      82
<PAGE>

Northern Institutional Funds
Equity Portfolios
- -------------------------------------------------------------------------------
Financial Highlights
For the Six Months Ended May 31, 1999 (Unaudited) and the Years Ended November
30,
International Growth Portfolio
<TABLE>
<CAPTION>
                                                 Class A
                          ------------------------------------------------------------
                            1999       1998      1997      1996      1995     1994(c)
- ----------------------------------------------------------------------------------------
<S>                       <C>        <C>       <C>       <C>       <C>        <C>
Net asset value, begin-
 ning of period           $  11.78   $  10.52  $  10.63  $   9.88  $  10.21   $  10.00
Income (loss) from in-
 vestment operations:
 Net investment income        0.11       0.09      0.11      0.10      0.12       0.05
 Net realized and
  unrealized gain (loss)      0.93       1.90      0.31      0.87     (0.36)      0.16
- ----------------------------------------------------------------------------------------
Total income (loss) from
 investment operations        1.04       1.99      0.42      0.97     (0.24)      0.21
- ----------------------------------------------------------------------------------------
Distributions to share-
 holders:
 Net investment income       (0.23)     (0.16)    (0.08)    (0.22)    (0.05)        --
 Net realized gain           (0.76)     (0.57)    (0.45)       --     (0.04)        --
- ----------------------------------------------------------------------------------------
Total distributions to
 shareholders                (0.99)     (0.73)    (0.53)    (0.22)    (0.09)        --
- ----------------------------------------------------------------------------------------
Net increase (decrease)       0.05       1.26     (0.11)     0.75     (0.33)      0.21
- ----------------------------------------------------------------------------------------
Net asset value, end of
 period                   $  11.83   $  11.78  $  10.52  $  10.63  $   9.88   $  10.21
- ----------------------------------------------------------------------------------------
Total return (a)              9.36%     20.44%     4.21%     9.96%    (2.32)%     2.11%
Ratio to average net as-
 sets of (b):
 Expenses, net of waiv-
  ers and reimbursements      1.06%      1.06%     1.06%     1.06%     1.06%      1.04%
 Expenses, before waiv-
  ers and reimbursements      1.31%      1.31%     1.37%     1.43%     1.38%      1.47%
 Net investment income,
  net of waivers and re-
  imbursements                1.58%      0.89%     0.97%     0.73%     1.22%      0.76%
 Net investment income,
  before waivers and re-
  imbursements                1.33%      0.64%     0.66%     0.36%     0.90%      0.33%
Portfolio turnover rate      85.67%    160.13%   153.22%   202.47%   215.31%     77.79%
Net assets at end of pe-
 riod (in thousands)      $114,123   $111,594  $106,774  $138,182  $148,704   $133,212
- ----------------------------------------------------------------------------------------
<CAPTION>
                                                 Class D
                          ------------------------------------------------------------
                          1999(d)      1998      1997      1996      1995     1994(e)
- ----------------------------------------------------------------------------------------
<S>                       <C>        <C>       <C>       <C>       <C>        <C>
Net asset value, begin-
 ning of period           $  11.60   $  10.39  $  10.54  $   9.83  $  10.21   $  10.47
Income (loss) from in-
 vestment operations:
 Net investment income
  (loss)                     (0.01)      0.09      0.09      0.01      0.19         --
 Net realized and
  unrealized gain (loss)      1.00       1.83      0.29      0.92     (0.48)     (0.26)
- ----------------------------------------------------------------------------------------
Total income (loss) from
 investment operations        0.99       1.92      0.38      0.93     (0.29)     (0.26)
- ----------------------------------------------------------------------------------------
Distributions to share-
 holders:
 Net investment income       (0.14)     (0.14)    (0.08)    (0.22)    (0.05)        --
 Net realized gain           (0.76)     (0.57)    (0.45)       --     (0.04)        --
- ----------------------------------------------------------------------------------------
Total distributions to
 shareholders                (0.90)     (0.71)    (0.53)    (0.22)    (0.09)        --
- ----------------------------------------------------------------------------------------
Net increase (decrease)       0.09       1.21     (0.15)     0.71     (0.38)     (0.26)
- ----------------------------------------------------------------------------------------
Net asset value, end of
 period                   $  11.69   $  11.60  $  10.39  $  10.54  $   9.83   $  10.21
- ----------------------------------------------------------------------------------------
Total return (a)              9.18%     19.91%     3.79%     9.59%    (2.78)%    (2.56)%
Ratio to average net as-
 sets of (b):
 Expenses, net of waiv-
  ers and reimbursements      1.45%      1.45%     1.45%     1.45%     1.45%      1.35%
 Expenses, before waiv-
  ers and reimbursements      1.70%      1.70%     1.76%     1.82%     1.77%      1.78%
 Net investment income
  (loss), net of waivers
  and reimbursements         (0.09)%     0.59%     0.54%     0.44%     2.01%        --
 Net investment income
  (loss), before waivers
  and reimbursements         (0.34)%     0.34%     0.23%     0.07%     1.69%     (0.43)%
Portfolio turnover rate      85.67%    160.13%   154.62%   202.47%   215.31%     77.79%
Net assets at end of pe-
 riod (in thousands)      $     10   $    203  $    234  $     94  $     20   $     --
- ----------------------------------------------------------------------------------------
</TABLE>
(a) Assumes investment at net asset value at the beginning of the period,
    reinvestment of all dividends and distributions, and a complete redemption
    of the investment at the net asset value at the end of the period. Total
    return is not annualized for periods less than one year.
(b) Annualized for periods less than a full year.
(c) For the period March 28, 1994 (commencement of operations) through
    November 30, 1994.
(d) Financial highlights for the six months ended May 31, 1999 were calculated
    using average shares outstanding for the period.
(e) For the period November 16, 1994 (Class D shares issue date) through
    November 30, 1994.

See accompanying notes to financial statements.

                                      83
<PAGE>

Northern Institutional Funds
Equity Portfolios
- -------------------------------------------------------------------------------
Financial Highlights
For the Six Months Ended May 31, 1999 (Unaudited) and the Years Ended November
30,
Small Company Index Portfolio
<TABLE>
<CAPTION>
                                                Class A
                          ------------------------------------------------------------
                            1999         1998       1997      1996     1995     1994
- ----------------------------------------------------------------------------------------
<S>                       <C>          <C>        <C>       <C>       <C>      <C>
Net asset value,
 beginning of period      $  13.02     $  15.05   $  13.97  $  12.98  $ 10.86  $ 11.29
Income (loss) from
 investment operations:
 Net investment income        0.05         0.13       0.15      0.19     0.16     0.14
 Net realized and
  unrealized gain (loss)      1.15        (1.13)      2.69      1.75     2.67    (0.30)
- ----------------------------------------------------------------------------------------
Total income (loss) from
 investment operations        1.19        (1.00)      2.84      1.94     2.83    (0.16)
- ----------------------------------------------------------------------------------------
Distributions to
 shareholders from:
 Net investment income       (0.10)       (0.14)     (0.17)    (0.14)   (0.15)   (0.02)
 Net realized gain           (1.51)       (0.89)     (1.59)    (0.81)   (0.56)   (0.25)
- ----------------------------------------------------------------------------------------
Total distributions to
 shareholders                (1.60)       (1.03)     (1.76)    (0.95)   (0.71)   (0.27)
- ----------------------------------------------------------------------------------------
Net increase (decrease)      (0.41)       (2.03)      1.08      0.99     2.12    (0.43)
- ----------------------------------------------------------------------------------------
Net asset value, end of
 period                   $  12.61     $  13.02   $  15.05  $  13.97  $ 12.98  $ 10.86
- ----------------------------------------------------------------------------------------
Total return (a)             10.33%       (7.02)%    23.06%    15.96%   27.76%   (1.54)%
Ratio to average net
 assets of (b):
 Expenses, net of
  waivers and
  reimbursements              0.36%(c)     0.31%      0.32%     0.32%    0.32%   0.33 %
 Expenses, before
  waivers and
  reimbursements              0.80%        0.74%      0.68%     0.79%    0.81%   0.86 %
 Net investment income,
  net of waivers and
  reimbursements              1.29%        1.19%      1.22%     1.36%    1.31%   1.27 %
 Net investment income,
  before waivers and
  reimbursements              0.85%        0.76%      0.86%     0.89%    0.82%   0.74 %
Portfolio turnover rate      46.54%       59.21%     42.66%    46.26%   38.46%  98.43 %
Net assets at end of
 period (in thousands)    $170,920     $139,100   $147,887  $112,856  $94,899  $77,120
- ----------------------------------------------------------------------------------------
</TABLE>

<TABLE>
<CAPTION>
                              Class C                       Class D
                          ------------------- -------------------------------------------
                           1999      1998 (d)  1999       1998    1997    1996   1995 (e)
- -----------------------------------------------------------------------------------------
<S>                       <C>        <C>      <C>        <C>     <C>     <C>     <C>
Net asset value,
 beginning of period      $12.98      $13.89  $12.94     $15.01  $13.96  $12.95   $10.51
Income (loss) from
 investment operations:
 Net investment income      0.05        0.03    0.11       0.11    0.17    0.13     0.18
 Net realized and
  unrealized gain (loss)    1.09       (0.94)   1.08      (1.19)   2.62    1.83     2.96
- -----------------------------------------------------------------------------------------
Total income (loss) from
 investment operations      1.14       (0.91)   1.19      (1.08)   2.79    1.96     3.14
- -----------------------------------------------------------------------------------------
Distributions to
 shareholders from:
 Net investment income     (0.03)         --   (0.10)     (0.10)  (0.15)  (0.14)   (0.14)
 Net realized gain         (1.51)         --   (1.51)     (0.89)  (1.59)  (0.81)   (0.56)
- -----------------------------------------------------------------------------------------
Total distributions to
 shareholders              (1.54)         --   (1.61)     (0.99)  (1.74)  (0.95)   (0.70)
- -----------------------------------------------------------------------------------------
Net increase (decrease)    (0.40)      (0.91)  (0.42)     (2.07)   1.05    1.01     2.44
- -----------------------------------------------------------------------------------------
Net asset value, end of
 period                   $12.58      $12.98  $12.52     $12.94  $15.01  $13.96   $12.95
- -----------------------------------------------------------------------------------------
Total return (a)            9.89%     (6.54)%   9.83%    (7.58)%  22.68%  16.20%   31.62%
Ratio to average net
 assets of (b):
 Expenses, net of
  waivers and
  reimbursements            0.60%(c)    0.55%   0.75%(c)   0.70%   0.71%   0.71%    0.71%
 Expenses, before
  waivers and
  reimbursements            1.04%       0.98%   1.19%      1.13%   1.07%   1.18%    1.20%
 Net investment income,
  net of waivers and
  reimbursements            1.05%       0.98%   0.90%      0.80%   0.76%   1.02%    0.90%
 Net investment income,
  before waivers and
  reimbursements            0.61%       0.55%   0.46%      0.37%   0.40%   0.55%    0.41%
Portfolio turnover rate    46.54%      59.21%  46.54%     59.21%  42.66%  46.26%   38.46%
Net assets at end of
 period (in thousands)    $  361      $  870  $  559     $  855  $  690  $  269   $   44
- -----------------------------------------------------------------------------------------
</TABLE>

(a) Assumes investment at net asset value at the beginning of the period,
    reinvestment of all dividends and distributions, and a complete redemption
    of the investment at the net asset value at the end of the period. Total
    return is not annualized for periods less than one year.
(b) Annualized for periods less than a full year.
(c) Expense ratio, net of waivers and reimbursement, for the six months ended
    May 31, 1999 would have been 0.31%, 0.55% and 0.70% for Class A, C and D
    respectively absent the effect of any interest expenses incurred by the
    fund's temporary borrowing against a credit line agreement.
(d) For the period January 8, 1998 (Class C shares issue date) through May 31,
    1998.
(e) For the period December 8, 1994 (Class D shares issue date) through
    November 30, 1995.

See accompanying notes to financial statements.

                                      84
<PAGE>

Northern Institutional Funds
Fixed Income and Equity Portfolios
- -------------------------------------------------------------------------------

Notes to Financial Statements
May 31, 1999
(Unaudited)
1. Organization
Northern Institutional Funds (the "Trust") is a Delaware business trust which
was formed on July 1, 1997, and is registered under the Investment Company Act
of 1940 (as amended) as an open-end management investment company. The Trust,
formerly known as The Benchmark Funds, changed its name effective July 15,
1998. The Trust includes seventeen portfolios, each with its own investment
objective. Each Portfolio, other than the International Bond Portfolio, is
classified as diversified. Except as noted below, the Northern Trust Company
("Northern") is the investment adviser for all actively managed Portfolios and
is the custodian and transfer agent for the Trust. Northern Trust Quantitative
Advisors, Inc. ("NTQA"), a wholly-owned subsidiary of Northern Trust
Corporation, is the investment adviser for the U.S. Treasury Index, Equity
Index, International Equity Index and Small Company Index Portfolios.
Effective May 1, 1999, Northern and First Data Investor Services Group, Inc.
("Investor Services Group") became the Trust's co-administrators, and First
Data Distributors, Inc. ("FDDI"), an affiliate of Investor Services Group,
became the Trust's distributor. Presented herein are the financial statements
of the fixed income and equity portfolios (the "Portfolios").
 Each of the Portfolios has three separate classes: Class A, C and D. Each
class is distinguished by the level of administrative support and transfer
agent service provided. As of May 31, 1999, Class A, Class C and Class D
shares are outstanding for certain Portfolios.

2. Significant Accounting Policies
The following is a summary of significant accounting policies consistently
followed by the Portfolios in the preparation of their financial statements.
These policies are in conformity with generally accepted accounting principles
("GAAP"). The presentation of financial statements in conformity with GAAP
requires management to make estimates and assumptions that affect the reported
amounts of assets and liabilities at the date of the financial statements and
the reported amounts of revenues and expenses during the reporting period.
Actual results could differ from those estimates.

(a) Investment Valuation
Investments held by a Portfolio are valued at the last quoted sale price on
the exchange on which such securities are primarily traded, or if any
securities are not traded on a valuation date, at the last quoted bid price.
Securities which are traded in the over-the-counter markets are valued at the
last quoted bid price. Exchange traded futures and options are valued at the
settlement price as established by the exchange on which they are traded.
Index futures are marked to market on a daily basis. Any securities, including
restricted securities, for which current quotations are not readily available
are valued at fair value as determined in good faith by Northern under the
supervision of the Board of Trustees (the "Board"). Short-term investments are
valued at amortized cost which Northern has determined, pursuant to Board
authorization, approximates market value.

(b) Investment Transactions and Investment Income
Investment transactions are recorded as of the trade date. Realized gains and
losses on investment transactions are calculated on the identified-cost basis.
Interest income is recorded on the accrual basis and includes amortization of
discounts and premiums. The interest rates reflected in the Statements of
Investments represent either the stated coupon rate, annualized yield on date
of purchase for discount notes, the current reset rate for floating rate
securities or, for interest only or principal only securities, the current
effective yield. Dividend income is recorded on the ex-dividend date.
Dividends from foreign securities are recorded on the ex-date, or as soon as
the information is available.

(c) Deferred Organization Costs
Organization-related costs are being amortized on a straight-line basis over
five years. In the event any of the initial shares of any of the Portfolios
are redeemed, the redemption proceeds will be reduced by the amount of any
unamortized organization expenses in the same proportion as the number of
shares redeemed bears to the number of initial shares held at the time of
redemption.

(d) Expenses
Expenses arising in connection with a specific Portfolio are allocated to that
Portfolio. Certain expenses arising in connection with a class of shares are
allocated to that class of shares. Expenses incurred which do not specifically
relate to an individual Portfolio are allocated among the Portfolios based on
each Portfolio's relative net assets.

(e) Repurchase Agreements
During the term of a repurchase agreement, the market value of the underlying
collateral, including accrued

                                      85
<PAGE>

Northern Institutional Funds
Fixed Income and Equity Portfolios
- -------------------------------------------------------------------------------

Notes to Financial Statements--Continued
May 31, 1999
(Unaudited)
interest, is required to exceed the market value of the repurchase agreement.
The underlying collateral for all repurchase agreements is held in a customer-
only account of Northern, as custodian for the Trust, at the Federal Reserve
Bank of Chicago.

(f) Futures Contracts
Each Portfolio may invest in long or short futures contracts for hedging
purposes, to increase total return (i.e., for speculative purposes) or to
maintain liquidity. The Portfolios bear the market risk arising from changes
in the value of these financial instruments. At the time a Portfolio enters
into a futures contract it is required to make a margin deposit with the
custodian of a specified amount of liquid assets. Subsequently, as the market
price of the futures contract fluctuates, gains or losses are recorded and
payments are made, on a daily basis, between the Portfolio and the broker. The
Statements of Operations reflect gains and losses as realized for closed
futures contracts and as unrealized for open futures contracts.
 At May 31, 1999, the Equity Index, International Equity Index and Small
Company Index Portfolios had entered into long exchange traded futures
contracts. The aggregate market value of assets pledged to cover margin
requirements for open positions at May 31, 1999 was approximately $2,542,000,
$20,000 and $663,000, respectively.

(g) Options Contracts
Each Portfolio may purchase and write (sell) put and call options on foreign
and domestic stock indices, foreign currencies, and U.S. and foreign
securities that are traded on U.S. and foreign securities exchanges and over-
the-counter markets. These transactions are for hedging (or cross-hedging)
purposes or for the purposes of earning additional income.
 The risk associated with purchasing an option is that the Portfolio pays a
premium whether or not the option is exercised. Additionally, the Portfolio
bears the risk of loss of premium and change in market value should the
counterparty not perform under the contract. Put and call options purchased
are accounted for in the same manner as Portfolio securities.
 The cost of securities acquired through the exercise of call options is
increased by the premiums paid. The proceeds from securities sold through the
exercise of put options are decreased by the premiums paid.
 In writing an option, the Portfolio bears the market risk of an unfavorable
change in the price of the security or currency underlying the written option.
Exercise of an option written by the Portfolio could result in the Portfolio
selling or buying a security or currency at a price different from the current
market value.
 The Portfolios did not write call or put options during the six months ended
May 31, 1999.

(h) Stripped Securities
Stripped securities represent the right to receive future interest payments
(interest only stripped securities) or principal payments (principal only
stripped securities). The value of variable rate interest only stripped
securities varies directly with changes in interest rates, while the value of
fixed rate interest only securities and the value of principal only stripped
securities vary inversely with changes in interest rates.

(i) Forward Foreign Currency Exchange Contracts
Certain Portfolios are authorized to enter into forward foreign currency
exchange contracts for the purchase of a specific foreign currency at a fixed
price on a future date as a hedge or cross-hedge against either specific
transactions or portfolio positions. In addition, the International Bond and
International Growth Portfolios may enter into foreign currency exchange
contracts for speculative purposes. The objective of a Portfolio's foreign
currency hedging transactions is to reduce the risk that the U.S. dollar value
of the Portfolio's foreign currency denominated securities will decline in
value due to changes in foreign currency exchange rates. All forward foreign
currency contracts are "marked-to-market" daily at the applicable exchange
rates and any resulting unrealized gains or losses are recorded in the
financial statements. The Portfolio records realized gains or losses when the
forward contract is offset by entry into a closing transaction or extinguished
by delivery of the currency. Risks may arise upon entering into these
contracts from the potential inability of counterparties to meet the terms of
their contracts and from unanticipated movements in the value of a foreign
currency relative to the U.S. dollar.
 The contractual amounts of forward foreign currency exchange contracts do not
necessarily represent the amounts potentially subject to risk. The measurement
of the risks associated with these instruments is meaningful only when all
related and offsetting transactions are considered.
 At May 31, 1999, there were no outstanding forward foreign currency exchange
contracts.

(j) Foreign Currency Translations
Values of investments denominated in foreign currencies are converted into
U.S. dollars using the spot market rate
                                      86
<PAGE>

- -------------------------------------------------------------------------------

of exchange at the time of valuation. Cost of purchases and proceeds from
sales of investments, interest and dividend income are translated into U.S.
dollars using the spot market rate of exchange prevailing on the respective
dates of such transactions.

 The gains or losses on investments resulting from changes in foreign exchange
rates are included with net realized and unrealized gain (loss) on
investments.

(k) Federal Taxes
It is each Portfolio's policy to comply with the requirements of the Internal
Revenue Code applicable to regulated investment companies and to distribute,
each year, substantially all of its taxable income and capital gains to its
shareholders. Therefore, no provision is made for federal taxes.
 At November 30, 1998, the Trust's most recent tax year end, the Portfolios
had approximately the following amounts of capital loss carryforwards for U.S.
federal income tax purposes:

<TABLE>
<CAPTION>
                         Amount
                     (in thousands) Year(s) of Expiration
- ---------------------------------------------------------
<S>                  <C>            <C>
U.S. Treasury Index       $323          2002 to 2005
- ---------------------------------------------------------
</TABLE>

 This amount is available to be carried forward to offset future capital gains
to the extent permitted by applicable laws or regulations.

(l) Distributions
Dividends from net investment income are declared and paid as follows:

<TABLE>
- -------------------------------------
<S>                         <C>
Bond                          Monthly
Intermediate Bond             Monthly
International Bond          Quarterly
Short-Intermediate Bond       Monthly
U.S. Government Securities    Monthly
U.S. Treasury Index           Monthly
Balanced                    Quarterly
Diversified Growth           Annually
Equity Index                Quarterly
Focused Growth               Annually
International Equity Index   Annually
International Growth         Annually
Small Company Index          Annually
- -------------------------------------
</TABLE>

 Each Portfolio's net realized capital gains are distributed at least
annually. Income dividends and capital gain distributions are determined in
accordance with income tax regulations. Such amounts may differ from income
and capital gains recorded in accordance with generally accepted accounting
principles.

3. Advisory, Transfer Agency and Custodian Agreements
The Trust has an investment advisory agreement whereby each Portfolio pays
Northern or NTQA, as the case may be, a fee, computed daily and payable
monthly, based on a specified percentage of its average daily net assets. For
the current period, Northern and NTQA each voluntarily agreed to waive a
portion of the advisory fees as shown on the accompanying Statements of
Operations. The annual advisory fees and waiver rates expressed as a
percentage of average daily net assets for the six months ended May 31, 1999,
are as follows:

<TABLE>
<CAPTION>
                                              Net
                            Advisory Less:  Advisory
                              Fee    Waiver   Fee
- ----------------------------------------------------
<S>                         <C>      <C>    <C>
Bond                           .60%   .35%    .25%
Intermediate Bond              .60    .35     .25
International Bond             .90    .20     .70
Short-Intermediate Bond        .60    .35     .25
U.S. Government Securities     .60    .35     .25
U.S. Treasury Index            .40    .25     .15
Balanced                       .80    .30     .50
Diversified Growth             .80    .25     .55
Equity Index                   .30    .20     .10
Focused Growth                1.10    .30     .80
International Equity Index     .50    .25     .25
International Growth          1.00    .20     .80
Small Company Index            .40    .20     .20
- ----------------------------------------------------
</TABLE>

 As compensation for the services rendered as transfer agent, including the
assumption by Northern of the expenses related thereto, Northern receives a
fee, computed daily and payable monthly, at an annual rate of .01%, .10% and
 .15% of the average daily net asset value of the outstanding Class A, C and D
shares, respectively, for the Portfolios.

4. Administration and Distribution Agreements
Northern and Investors Services Group, the co-administrators of the Portfolios
as of May 1, 1999, are entitled to a monthly co-administrative fee at an
annual rate of 0.10% (0.15% in the case of the International Bond,
International Equity Index and International Growth Portfolios) of the average
daily net assets of the respective Portfolios. The co-administrators are also
entitled to additional fees for special legal services.
 The Trust had an administration agreement with Goldman Sachs during the five
months ended April 30, 1999 whereby each Portfolio paid the administrator a
fee at an annual rate of .10% of the Portfolio's average daily

                                      87
<PAGE>

Northern Institutional Funds
Fixed Income and Equity Portfolios
- -------------------------------------------------------------------------------

Notes to Financial Statements--Continued
May 31, 1999
(Unaudited)
net assets (.15% for the International Bond, International Equity Index and
International Growth Portfolios).
 In addition, if in any fiscal year the sum of a Portfolio's expenses,
including the administration fee, but excluding the fees payable to Northern
for its duties as investment adviser and transfer agent, shareholder servicing
fees and extraordinary expenses (such as taxes, interest and indemnification
expenses), exceeded on an annualized basis .10% of a Portfolio's average daily
net assets (0.25% for the International Bond, International Growth and
International Equity Index Portfolios), the administrators reimbursed each
Portfolio for the amount of the excess pursuant to the terms of the
administration agreements.
 The expenses reimbursable during the six months ended May 31, 1999, under
such arrangements, are shown on the accompanying Statements of Operations. No
administration fees were waived under this agreement during the six months
ended May 31, 1999.
 Goldman Sachs received no compensation under the distribution agreement.
 FDDI, the distributor for the Portfolios as of May 1, 1999, receives no
compensation under the distribution agreement.

5. Shareholder Servicing Plan
The Trust has adopted a Shareholder Servicing Plan pursuant to which the Trust
may enter into agreements with institutions or other financial intermediaries
under which they will render certain shareholder administrative support
services for their customers or other investors who beneficially own Class C
and D shares. As compensation under the Shareholder Servicing Plan, the
institution or other financial intermediary receives a fee at an annual rate
of up to .15% and .25% of the average daily net asset value of the outstanding
Class C and D shares, respectively.

6. Investment Transactions
Investment transactions for the six months ended May 31, 1999 (excluding
short-term investments) were as follows:

<TABLE>
<CAPTION>
                                                    Proceeds
                                                   from sales   Proceeds
                                                       and     from sales
                             Purchases             maturities     and
                              of U.S.   Purchases    of U.S.   maturities
                            Government   of other  Government   of other
                            Obligations securities Obligations securities
- -------------------------------------------------------------------------
                                           (in thousands)
<S>                         <C>         <C>        <C>         <C>
Bond                         $303,421    $138,241   $220,042    $ 58,428
Intermediate Bond              84,719      23,601     77,692      10,540
International Bond                 --       2,676         --       1,816
Short-
 Intermediate Bond             62,046      35,404     65,325      30,787
U.S. Government Securities     41,214          --     16,996          --
U.S. Treasury Index            14,503          --     13,856          --
Balanced                       15,617       5,975      8,337      18,034
Diversified Growth                 --      57,310         --      63,048
Equity Index                       --      66,507         --     126,931
Focused Growth                     --      78,615         --      74,145
International Equity Index         --       3,985         --       5,134
International Growth               --      91,979         --     101,318
Small Company Index                --     117,160         --      86,593
- -------------------------------------------------------------------------
</TABLE>
 As of May 31, 1999, the composition of unrealized appreciation (depreciation)
of investment securities (including the effects of foreign currency
translation and excluding futures transactions) based on the aggregate cost of
investments for federal income tax purposes were as follows:
<TABLE>
<CAPTION>
                                                                     Cost for
                                                                     Federal
                                                           Net        Income
                                                       Appreciation    Tax
                            Appreciation Depreciation (Depreciation) Purposes
- -----------------------------------------------------------------------------
                                             (in thousands)
<S>                         <C>          <C>          <C>            <C>
Bond                          $    904     $30,745       $(29,841)   $825,228
Intermediate Bond                  260       1,810         (1,550)     55,113
International Bond                 613       1,172           (559)     27,709
Short-Intermediate Bond            461      11,381        (10,920)    186,597
U.S. Government Securities          59       1,277         (1,218)     84,337
U.S. Treasury Index                268         483           (215)     22,891
Balanced                        12,980       1,766         11,214      61,424
Diversified Growth              66,825       2,118         64,707     121,439
Equity Index                   548,365      19,388        528,977     896,640
Focused Growth                  50,983       1,652         49,331     114,254
International Equity Index       6,611       2,933          3,678      41,260
International Growth            10,174       4,114          6,060     103,852
Small Company Index             21,878      13,753          8,125     170,966
- -----------------------------------------------------------------------------
</TABLE>


                                      88
<PAGE>

- -------------------------------------------------------------------------------


7. Bank Loans
The Trust maintains a $100,000,000 revolving bank credit line and a
$15,000,000 conditional revolving credit line for liquidity and other
purposes. Borrowings under this arrangement bear interest at 1% above the
federal funds rate and are secured by pledged securities equal to or exceeding
120% of the outstanding balance.
 Interest expense for the six months ended May 31, 1999 was approximately
$2,000, $4,000, $3,000, $1,000 and $47,000 for the Diversified Growth, Equity
Index, Focused Growth, International Equity Index and Small Company Index
Portfolios, respectively. These amounts are included in "Other Expenses" on
the Statements of Operations.
 As of May 31, 1999, there were no outstanding borrowings.

8. Share Transactions
Transactions in Class A Shares for the six months ended May 31, 1999 were as
follows:
<TABLE>
<CAPTION>
                                                                Net
                                    Reinvested                increase
                            Sales  distributions Redemptions (decrease)
- -----------------------------------------------------------------------
                                          (in thousands)
<S>                         <C>    <C>           <C>         <C>
Bond                         7,788     1,708        1,764      7,732
Intermediate Bond            3,566        58        2,711        913
International Bond              39        47           12         74
Short-Intermediate Bond      2,477       427        2,784        120
U.S. Government Securities   1,917       120          186      1,851
U.S. Treasury Index            402        14          356         60
Balanced                       991       468          528        931
Diversified Growth             528     1,105        1,031        602
Equity Index                10,913     3,273       11,618      2,568
Focused Growth               1,183       558          679      1,062
International Equity Index     258       251          371        138
International Growth           470       695          989        176
Small Company
 Index                       9,351     1,961        8,440      2,872
- -----------------------------------------------------------------------
</TABLE>

 Transactions in Class A shares for the year ended November 30, 1998 were as
follows:

<TABLE>
<CAPTION>
                                                                Net
                                    Reinvested                increase
                            Sales  distributions Redemptions (decrease)
- -----------------------------------------------------------------------
                                          (in thousands)
<S>                         <C>    <C>           <C>         <C>
Bond                        10,138     1,515        5,483      6,170
Intermediate Bond            1,392        67          551        908
International Bond             108        60          140         28
Short-Intermediate Bond      6,204       738        7,697       (755)
U.S. Government Securities     632       116          518        230
U.S. Treasury Index            724        21        1,357       (612)
Balanced                     1,380       239        1,260        359
Diversified Growth             812     1,322        1,887        247
Equity Index                24,202     3,689       18,131      9,760
Focused Growth               1,385     1,532        2,536        381
International Equity Index   1,984        63        1,540        507
International Growth           892       644        2,220       (684)
Small Company
 Index                       7,425       673        7,245        853
- -----------------------------------------------------------------------
</TABLE>

 Transactions in Class C shares for the six months ended May 31, 1999 were as
follows:

<TABLE>
<CAPTION>
                                                               Net
                                   Reinvested                increase
                            Sales distributions Redemptions (decrease)
- ----------------------------------------------------------------------
                                          (in thousands)
<S>                         <C>   <C>           <C>         <C>
Bond                         537       189           535        191
U.S. Government Securities     4         3           202       (195)
U.S. Treasury Index           12        --             6          6
Balanced                      20        37           366       (309)
Equity Index                 825       347         1,348       (176)
Focused Growth                38        42            56         24
Small Company
 Index                        74         1           113        (38)
- ----------------------------------------------------------------------
</TABLE>

                                      89
<PAGE>

Northern Institutional Funds
Fixed Income and Equity Portfolios
- -------------------------------------------------------------------------------

Notes to Financial Statements--Continued
May 31, 1999
(Unaudited)

 Transactions in Class C shares for the year ended November 30, 1998 were as
follows:

<TABLE>
<CAPTION>
                                                               Net
                                   Reinvested                increase
                            Sales distributions Redemptions (decrease)
- ----------------------------------------------------------------------
                                          (in thousands)
<S>                         <C>   <C>           <C>         <C>
Bond                        1,409      192         1,156       445
U.S. Government Securities     84        9            54        39
U.S. Treasury Index             8       --             7         1
Balanced                      104       21            97        28
Equity Index                2,131      373         1,696       808
Focused Growth                 12      115           109        18
Small Company Index           153       --            86        67
- ----------------------------------------------------------------------
</TABLE>

 Transactions in Class D shares for the six months ended May 31, 1999 were as
follows:

<TABLE>
<CAPTION>
                                                               Net
                                   Reinvested                increase
                            Sales distributions Redemptions (decrease)
- ----------------------------------------------------------------------
                                          (in thousands)
<S>                         <C>   <C>           <C>         <C>
Bond                           6         6           25         (13)
Intermediate Bond             --        --           --          --
International Bond            --        --            5          (5)
Short-Intermediate Bond        3         2           33         (28)
U.S. Government Securities     8         2           29         (19)
U.S. Treasury Index            7         1           63         (55)
Balanced                      10         5           30         (15)
Diversified Growth             4         8           57         (45)
Equity Index                 155        95          951        (701)
Focused Growth                 3         5           72         (64)
International Equity Index    --        --           --          --
International Growth           1         1           18         (16)
Small Company Index            5         8           35         (22)
- ----------------------------------------------------------------------
</TABLE>

 Transactions in Class D shares for the year ended November 30, 1998 were as
follows:

<TABLE>
<CAPTION>
                                                               Net
                                   Reinvested                increase
                            Sales distributions Redemptions (decrease)
- ----------------------------------------------------------------------
                                          (in thousands)
<S>                         <C>   <C>           <C>         <C>
Bond                         118         5           58          65
Intermediate Bond              2        --           --           2
International Bond             3        --            2           1
Short-Intermediate Bond       22         4           29          (3)
U.S. Government Securities    51         1            8          44
U.S. Treasury Index           21         3           27          (3)
Balanced                      45         3           21          27
Diversified Growth            32         8           20          20
Equity Index                 513       137          778        (128)
Focused Growth                52        21           38          35
International Equity Index     1        --           --           1
International Growth          15         1           22          (6)
Small Company Index           38         3           21          20
- ----------------------------------------------------------------------
</TABLE>

                                      90
<PAGE>

Investment Advisers:
The Northern Trust Company
Northern Trust Quantitative Advisors, Inc.
50 South LaSalle Street
Chicago, Illinois 60675

Transfer Agent and Custodian:
The Northern Trust Company



This Semi-Annual Report is authorized for distribution to prospective investors
only when preceded or accompanied by a Prospectus which contains facts
concerning the objectives and policies, management expenses and other
information.
<PAGE>

Northern Institutional Funds


                           MONEY MARKET PORTFOLIOS





                                                      May 31, 1999


                                Semi-Annual Report








<PAGE>

Northern Institutional Funds
Money Market Portfolios

- --------------------------------------------------------------------------------

Table of Contents

<TABLE>
<CAPTION>
                                                                            Page
                                                                            ----
<S>                                                                         <C>
Investment Strategy........................................................   2
Statements of Investments
  Investment Abbreviations and Notes.......................................   3
  Diversified Assets Portfolio.............................................   4
  Government Portfolio.....................................................   8
  Government Select Portfolio..............................................   9
  Tax Exempt Portfolio.....................................................  10
Statements of Assets and Liabilities.......................................  15
Statements of Operations...................................................  16
Statements of Changes in Net Assets........................................  17
Financial Highlights.......................................................  18
Notes to the Financial Statements..........................................  22
</TABLE>

- --------------------------------------------------------------------------------

                                       1
<PAGE>

Northern Institutional Funds
Money Market Portfolios
- -------------------------------------------------------------------------------
Investment Strategy

What Has Changed

  While the Federal Open Market Committee (FOMC), as expected, raised the
federal funds rate by 25 basis points, its shift to a neutral bias regarding
future policy actions surprised financial markets, providing solace to the
beleaguered U.S. bond market and pushing domestic stock indices to new highs.
On a less pleasant note, the central bank's tightening in the absence of
inflationary pressures and the declaration of a 3% "speed limit" for the U.S.
economy combined to increase uncertainty for market participants. Meanwhile,
despite somewhat spotty evidence, expectations of global recovery
strengthened.

Economic Outlook

WORLD ECONOMIC GROWTH IS PICKING UP

  Continued increases in real income and capital gains in both the stock and
housing markets have combined to support strong household spending. Strength
in household demand and improved corporate profits have kept business
investment spending robust. In addition, some capital goods expenditures may
have been brought forward in the year because of year 2000 compliance issues.
The rise in mortgage rates in recent months is expected to slow down the
residential real estate sector. Mortgage rate increases also would be expected
to deter existing homeowners from tapping the equity that they have built up
in their houses. Home-equity withdrawal appears to have been important in
fueling consumer spending. While these elements of domestic demand moderate,
foreign demand appears to be strengthening. A number of East Asian economies
have entered a recovery phase, including the Japanese economy. European Union
economies are either exhibiting a reacceleration in growth or continue to grow
at a relatively high rate. One region, however, that remains very weak is
South America.

  Prices of industrial commodities have started to move higher. To a large
degree, the sharp increase in the prices of petroleum products is the result
of production cuts by the Organization of Petroleum Exporting Countries
(OPEC). The recovery of the global economy, however, also has contributed to
oil price increases, as well as to the continued rise in the prices of wood
products and the rebound in the prices of industrial metals. Higher commodity
prices have resulted in the firming of intermediate goods prices. This rise in
commodity prices in combination with stronger-than-expected global economic
growth has raised inflationary expectations. To date, however, there has been
no acceleration in the prices of final goods and services when the effects of
higher energy prices are excluded.

  With the continued strength in domestic demand and the nascent recovery in
foreign demand, the Federal Reserve has increased its target federal funds
rate by 25 basis points to 5% in an effort to preempt any rise in underlying
inflation. The FOMC has moved back to a neutral policy stance and has
indicated that strong aggregate demand for goods and services and "tight"
labor markets alone would not necessarily trigger further near-term Federal
Reserve actions to raise interest rates. Rather, the central bank's comments
imply that the decision whether to push interest rates higher would depend
more on the behavior of factors with a closer link to inflation than economic
growth or the rate of unemployment. Of course, investors may have some
difficulty taking the Federal Reserve's "neutral" bias at face value, given
that the monetary authority just raised interest rates by 25 basis points
without any real inflationary justification.

                                                                     July, 1999

                                       2
<PAGE>

Northern Institutional Funds
Money Market Portfolios
- --------------------------------------------------------------------------------
Statements of Investments
May 31, 1999
(Unaudited)
Investment Abbreviations and Notes:
AMBAC--American Municipal Bond Assurance Corp.
BAN  --Bond Anticipation Note
BTP  --Bankers Trust Partnership
Colld.
     --Collateralized
CP   --Commercial Paper
FFCB --Federal Farm Credit Bank
FGIC --Financial Guaranty Insurance Corp.
FHLB --Federal Home Loan Bank
FHLMC--Freddie Mac
FRN  --Floating Rate Note
FSA  --Financial Security Assurance Corp.
GO   --General Obligation
Gtd. --Guaranteed
HDA  --Housing Development Authority
HFA  --Housing Finance Authority

IDA  --Industrial Development Authority
IDR  --Industrial Development Revenue
LOC  --Letter of Credit
MBIA --Municipal Bond Insurance Association
ML/SG--Merrill Lynch/Societe Generale
P-Floats
     --Puttable Floating Rate Security
PCR  --Pollution Control Revenue
PSF  --Permanent School Fund
SFM  --Single Family Mortgage
Soc Gen
     --Societe Generale
TAN  --Tax Anticipation Note
TOB  --Tender Option Bond
TOCR --Tender Option Custodial Receipts
TRB  --Tax Revenue Bond
TRAN --Tax and Revenue Anticipation Note
VRDN --Variable Rate Demand Note

 . The percentage shown for each investment category reflects the value of
  investments in that category as a percentage of net assets.

 . Interest rates represent either the stated coupon rate, annualized yield on
  date of purchase for discounted notes, or, for floating rate securities, the
  current reset rate.

 . Maturity dates represent either the stated date on the security or the next
  interest reset date for floating and variable rate securities per SEC rules.

 . Amortized cost also represents cost for federal income tax purposes.

 . Interest rates are reset daily and interest is payable monthly with respect
  to all joint repurchase agreements.

See accompanying notes to financial statements.
                                       3
<PAGE>

Northern Institutional Funds
Money Market Portfolios
- --------------------------------------------------------------------------------
Statements of Investments
May 31, 1999
(All amounts in thousands)
(Unaudited)
<TABLE>
<CAPTION>
           Description
- ------------------------------------------------------
 Principal          Maturity    Amortized
  Amount   Rate     Date             Cost
- ------------------------------------------------------
                          Diversified Assets Portfolio
 <C>       <C>      <S>        <C>
 CERTIFICATES OF DEPOSIT--10.2%
 Domestic Depository Institutions--2.3%
           Bankers Trust Co.
 $ 15,000    5.71%    7/1/99   $   14,999
           Huntington
           National Bank
   20,000    5.00     2/8/00       19,999
           Huntington
           National Bank,
           Columbus
   58,000    5.35    5/31/00       57,972
           Michigan National
           Bank
   12,500    5.13    4/25/00       12,494
           Regions Bank
   25,000    4.87    7/20/99       25,000
                               ----------
                                  130,464
                               ----------
 Foreign Depository Institutions--7.9%
           Abbey National PLC
    2,500    5.72    6/11/99        2,500
           Bank of Nova
           Scotia, New York
   50,000    5.16    2/25/00       49,986
           Banque Nationale
           de Paris, Chicago
   25,000    5.20    2/25/00       24,995
   92,000    5.07    4/17/00       91,961
           Banque Nationale
           de Paris, San
           Francisco
   12,500    4.94   12/14/99       12,499
           Commerzbank, New
           York
   50,000    5.06     2/8/00       49,992
           Deutsche Bank, New
           York
   37,500    5.20    5/10/00       37,483
           Royal Bank of
           Canada, New York
   47,000    5.21    2/28/00       46,987
           Societe Generale,
           New York
  100,000    5.22    2/28/00       99,971
   40,000    5.20     5/8/00       39,986
                               ----------
                                  456,360
- ------------------------------------------------------
 TOTAL CERTIFICATES OF DE-
  POSIT                        $  586,824
- ------------------------------------------------------
 COMMERCIAL PAPER--55.1%
 Administraton of Environment & Housing
  Programs--0.6%
           Alaska Housing
           Finance Corp.
 $  5,000    4.89%   6/30/99   $    4,980
   21,700    4.85     7/2/99       21,609
    7,500    4.85     7/6/99        7,465
                               ----------
                                   34,054
                               ----------
 Auto Manufacturers--2.8%
           Cooperative
           Association of
           Tractor Dealers,
           Series A
    5,100    4.86    7/16/99        5,069
   10,000    4.85     8/5/99        9,912
           Series B
   16,400    4.80     8/2/99       16,264
           Ford Motor Credit
           Ltd. Canada
   26,000    4.89     6/7/99       25,979
           General Motors
           Acceptance Corp.
   15,000    4.98     6/9/99       14,983
   16,000    4.95    6/10/99       15,980
</TABLE>
<TABLE>
<CAPTION>
           Description
- -----------------------------------------
 Principal          Maturity    Amortized
  Amount   Rate     Date             Cost
- -----------------------------------------
 <C>       <C>      <S>        <C>
 $ 13,000    4.83%   7/21/99   $   12,913
   10,000    4.87    7/26/99        9,926
   20,000    4.89    8/17/99       19,791
           Moriarty Ltd.
   29,000    4.83    7/12/99       28,840
                               ----------
                                  159,657
                               ----------
 Banks--1.2%
           Morgan J.P. & Co.,
           Inc.
    6,890    4.88    6/11/99        6,881
   50,000    4.75    7/26/99       49,637
           KeyCorp, Inc.
   11,000    4.91    6/18/99       10,974
                               ----------
                                   67,492
                               ----------
 Beverages--0.6%
           Coca Cola
           Enterprises
    6,000    4.88    6/10/99        5,993
    3,500    4.87    7/13/99        3,480
   23,500    4.83    8/18/99       23,254
                               ----------
                                   32,727
                               ----------
 Collateralized Loan Obligations--2.2%
           Lyon Short Term
           Funding
   10,000    4.85    7/16/99        9,939
    3,112    4.93    8/13/99        3,081
           Syndicated Loan
           Funding Trust
           Series 1991-1
   35,000    5.15    6/15/99       35,000
           Series 1999-2
   50,000    5.06    6/15/99       50,000
           Triangle Funding,
           Ltd., 1998-1A 1 P
   30,000    5.04    7/15/99       30,000
                               ----------
                                  128,020
                               ----------
 Electrical Services--1.6%
           Alliant
           Industries, Inc.
   14,000    4.87    6/25/99       13,955
           FPL Group Capital,
           Inc.
   13,000    4.83     6/7/99       12,990
   20,500    4.88    6/10/99       20,475
   23,500    4.88    7/23/99       23,334
           Texas Municipal
           Power Agency
   20,800    5.00     6/3/99       20,800
                               ----------
                                   91,554
                               ----------
 Electronics & Other Electric Compo-
  nents--2.3%
           Cooper Electric
           Capital Corp.
   20,995    4.95     6/1/99       20,995
           General Electric
           Capital Corp.
  112,000    4.87    6/18/99      111,742
                               ----------
                                  132,737
                               ----------
 Food--0.3%
           Diageo PLC
   18,000    7.00    6/15/99       18,012
                               ----------
</TABLE>

See accompanying notes to financial statements.

                                       4
<PAGE>

- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
           Description
- -----------------------------------------
 Principal          Maturity    Amortized
  Amount   Rate     Date             Cost
- -----------------------------------------
 <C>       <C>      <S>        <C>
 Foreign Depository Institutions--7.1%
           Banco Santander
           Centrale Hispano
           Corp.
 $ 50,000    4.88%   6/11/99   $   49,932
           Bank of Scotland
   35,000    4.87     6/3/99       34,991
           Credit Communal de
           Belgique
   40,000    4.75    7/21/99       39,736
           Nordbanken N.A.,
           Inc.
   20,000    4.85    9/30/99       19,674
           Prudential Finance
           UK
   50,000    4.88     6/8/99       49,953
           San Paolo U.S.
           Financial Co.
   50,000    4.86     6/4/99       49,980
    5,000    4.83     9/8/99        4,934
           Spintab
           AB/Swedmortgage
   31,800    4.92     6/8/99       31,770
   58,000    4.87    9/16/99       57,160
           Swedbank, Inc.
   23,000    4.88     7/8/99       22,885
           UBS Finance
           (Delaware), Inc.
   50,000    4.85    6/10/99       49,939
                               ----------
                                  410,954
                               ----------
 Insurance--2.3%
           Aetna Service Co.
   32,500    4.88    6/21/99       32,412
   17,500    4.89    6/21/99       17,452
           AON Corp.
   10,000    4.86     6/3/99        9,997
    7,500    4.85    6/18/99        7,483
           Commoloco, Inc.
   25,250    4.82     9/3/99       24,932
           SAFECO Credit
           Corp.
   10,800    4.90    7/27/99       10,718
    6,775    4.92    8/19/99        6,702
           Torchmark, Inc.
    5,000    4.92    7/12/99        4,972
   10,500    4.84    7/21/99       10,429
    7,500    4.85    7/21/99        7,449
                               ----------
                                  132,546
                               ----------
 Machines & Computer Equipment--0.4%
           BTR Finance, Inc.
   22,250    4.88    8/20/99       22,009
                               ----------
 Multi-Sellers Conduits--8.4%
           Barton Capital
           Corp.
   10,568    4.85     7/6/99       10,518
   25,799    4.90    7/21/99       25,623
   31,479    4.90    7/23/99       31,256
   15,000    4.83     8/4/99       14,871
           Concord Minutemen
           Capital Co.
   37,546    4.92     6/3/99       37,536
   32,000    4.85     6/8/99       31,970
   25,000    4.88    8/20/99       24,729
           International
           Securitization
           Corp.
   40,000    4.95    8/31/99       39,500
</TABLE>
<TABLE>
<CAPTION>
           Description
- -----------------------------------------
 Principal          Maturity    Amortized
  Amount   Rate     Date             Cost
- -----------------------------------------
 <C>       <C>      <S>        <C>
           Kitty Hawk Funding
           Corp.
 $ 37,500    4.88%    6/8/99   $   37,464
   20,000    4.95    6/15/99       19,962
           Ness LLC
   10,000    4.90    6/24/99        9,969
   15,000    4.84    7/22/99       14,897
           Quincy Capital
           Corp.
   40,000    4.87     7/8/99       39,800
   50,000    4.88    7/22/99       49,654
           Receivables
           Capital Corp.
    7,495    5.00     6/4/99        7,492
           Silver Tower U.S.
           Funding
   10,000    4.86     1/8/99        9,784
   35,000    4.93   11/18/99       34,185
           Thames Asset
           Global
           Securitization
   10,000    4.95    8/31/99        9,875
           Variable Funding
   35,000    4.95     6/1/99       35,000
                               ----------
                                  484,085
                               ----------
 Non-Depository Credit Institutions--
  1.3%
           Finova Capital
           Corp.
   12,500    4.84     6/4/99       12,495
   10,000    4.90     7/9/99        9,948
   12,500    4.85    7/12/99       12,431
   10,000    4.90    7/16/99        9,939
   17,500    4.85    8/27/99       17,295
   12,000    4.94    8/27/99       11,857
                               ----------
                                   73,965
                               ----------
 Non-Depository Personal Credit
  Institutions--1.3%
           Heller Financial
           Corp.
   20,000    4.93    6/24/99       19,937
   24,000    4.95    6/28/99       23,911
    8,000    4.88     8/2/99        7,933
           Household Finance
           Corp.
   12,500    4.90    8/19/99       12,366
   12,500    4.92    8/24/99       12,357
                               ----------
                                   76,504
                               ----------
 Other Asset Backed Securities--1.1%
           Dakota Certificates Program
   13,600    4.83    7/13/99       13,523
   50,000    4.83    7/19/99       49,678
                               ----------
                                   63,201
                               ----------
 Securities Arbitrage--13.7%
           ABC Funding
   19,000    4.88    8/16/99       18,804
    8,200    4.88    8/31/99        8,099
   22,000    4.86    9/22/99       21,664
    5,150    4.88    9/22/99        5,071
           Beta Finance Corp.
   12,500    4.84    9/24/99       12,307
           Centauri Corp.
   37,500    4.88    9/13/99       36,971
</TABLE>

See accompanying notes to financial statements.

                                       5
<PAGE>

Northern Institutional Funds
Money Market Portfolios
- --------------------------------------------------------------------------------
Statements of Investments
May 31, 1999
(All amounts in thousands)
(Unaudited)
<TABLE>
<CAPTION>
           Description
- -----------------------------------------------------------
 Principal          Maturity    Amortized
  Amount   Rate     Date             Cost
- -----------------------------------------------------------
                    Diversified Assets Portfolio--Continued
 <C>       <C>      <S>        <C>
           Conduit Asset
           Backed
           Securities Co.,
           Ltd.
 $ 11,790    4.90%   6/22/99   $   11,756
   23,765    4.87    7/23/99       23,598
           Crown Point
           Capital Co.
   23,591    4.88    6/23/99       23,521
           Dorada Finance,
           Inc.
    6,500    4.85     6/8/99        6,494
           Giro Funding Corp.
   10,000    4.86     7/6/99        9,953
   25,340    4.86     7/8/99       25,213
   17,500    4.86     7/9/99       17,410
   25,441    4.86     8/5/99       25,218
    7,500    4.91    8/16/99        7,422
           Grayhawk Funding
   24,800    4.83     7/8/99       24,677
   20,000    4.83    7/12/99       19,890
           Intrepid Funding
   37,000    5.02     6/3/99       36,990
           K2 USA LLC
   10,000    4.85     7/6/99        9,953
    2,500    4.85    7/15/99        2,485
    5,000    4.90    7/15/99        4,970
    3,250    4.85    9/15/99        3,204
    9,500    4.89    9/17/99        9,361
   10,000    4.86   10/15/99        9,816
    6,387    4.84   10/18/99        6,268
           MPF, Ltd.
   50,000    4.90    6/28/99       49,816
           SALTS(III) Cayman
           Islands Corp.
   26,000    5.50    6/12/99       26,000
   15,000    5.44    6/18/99       15,000
   75,000    5.32    7/23/99       75,000
           Sigma Finance,
           Inc.
    3,250    4.90    6/10/99        3,246
   37,750    4.78     8/4/99       37,429
   10,500    4.80     8/6/99       10,408
   29,000    4.83    8/11/99       28,724
   48,000    4.83    8/16/99       47,511
   12,000    4.86    9/27/99       11,809
   44,750    4.83   10/19/99       43,909
   50,000    4.82   11/12/99       48,902
           Trident Capital
           Finance, Inc.
   12,000    4.84    7/20/99       11,921
                               ----------
                                  790,790
                               ----------
 Single-Seller Conduits--4.0%
           Atlantis One
           Funding Corp.
   30,000    4.88    7/26/99       29,776
   50,000    4.88    7/27/99       49,620
   33,500    4.87    8/24/99       33,119
   58,597    4.87    8/25/99       57,923
   25,000    4.90    9/22/99       24,615
           CPI Funding
   35,000    4.86    8/25/99       34,598
                               ----------
                                  229,651
                               ----------
</TABLE>
<TABLE>
<CAPTION>
           Description
- ------------------------------------------
 Principal           Maturity    Amortized
  Amount   Rate      Date             Cost
- ------------------------------------------
 <C>       <C>       <S>        <C>
 Telephone--1.9%
           GTE Corp.
 $ 14,000    4.85%     6/2/99   $   13,998
   25,000    4.95      6/2/99       24,997
   22,000    4.85      6/4/99       21,991
   24,000    4.85      6/7/99       23,981
   18,500    4.85      6/8/99       18,483
   10,000    4.85     6/10/99        9,988
                                ----------
                                   113,438
                                ----------
 Transportation Equipment--2.0%
           Daimler-Chrysler
   25,000    4.85     8/18/99       24,737
   50,000    4.88     8/23/99       49,437
           Volkswagen of
           America, Inc.
   40,000    4.95      6/1/99       40,000
                                ----------
                                   114,174
- ------------------------------------------
 TOTAL COMMERCIAL PAPER         $3,175,570
- ------------------------------------------
 CORPORATE NOTES--6.2%
           Beneficial Corp.,
           FRN
 $  5,000    5.07%    6/23/99   $    5,000
           Chrysler Financial
           Corp.
    5,000    6.28     6/22/99        5,003
           CIT Group Inc., FRN
   57,500    4.83      6/1/99       57,461
           Countrywide Home
           Loan FRN
   25,000    5.01      8/4/99       24,998
           GE Engine
           Receivables 1995-1
           Trust, FRN
    8,940    4.91      6/7/99        9,223
           GE Engine
           Receivables 1996-1
           Trust, FRN
   27,232    4.91      6/7/99       26,950
           General Motors
           Acceptance Corp.
           FRN
   12,500    5.00      6/1/99       12,500
   20,000    5.03      6/1/99       19,999
           Heller Financial,
           Inc.
   35,000    5.67      6/1/99       35,031
           Household Finance
           Co.
   13,000    5.10     7/14/99       13,000
           Liberty Light U.S.
           Capital Medium Term
           FRN
   25,000    5.04     10/8/99       24,991
           Morgan Stanley
           Trust Certificates
           1996-2, FRN
   23,296    5.03     6/23/99       23,296
           Transamerica
           Financial Corp.,
           FRN
   25,000    5.25    10/22/99       25,000
           United Health Care
           Corp.
   75,000    5.65     12/1/99       75,001
- ------------------------------------------
 TOTAL CORPORATE NOTES          $  357,453
- ------------------------------------------
</TABLE>

See accompanying notes to financial statements.

                                       6
<PAGE>

- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
           Description
- ----------------------------------------
 Principal          Maturity   Amortized
  Amount   Rate     Date            Cost
- ----------------------------------------
 <C>       <C>      <S>        <C>
 EURODOLLAR TIME DEPOSITS--10.4%
           Banco Popular,
           Puerto Rico
 $ 50,000    4.88%    6/1/99   $ 50,000
           Bank of Scotland,
           Grand Cayman
           Islands
   50,000    4.88     6/1/99     50,000
           Canadian Imperial
           Bank of Commerce,
           Grand Cayman
           Islands
  100,000    4.88     6/1/99    100,000
           CDC Marches, Paris
  150,681    4.88     6/1/99    150,681
           Firstar Bank,
           Grand Cayman
           Islands
  150,000    4.88     6/1/99    150,000
           Key Bank, N.A.,
           Grand Cayman
           Islands
  100,000    4.88     6/1/99    100,000
- ----------------------------------------
 TOTAL EURODOLLAR TIME
  DEPOSITS                     $600,681
- ----------------------------------------
 INSURANCE FUNDING AGREEMENTS--3.6%
           General American
           Life Insurance Co.
 $100,000    5.12%   6/23/99   $100,000
           Integrity Life
           Insurance Co.
   30,000    5.20     6/7/99     30,000
           Life Insurance
           Company of
           Virginia
   50,000    4.99     6/1/99     50,000
           Transamerica Life
           Insurance and
           Annuity Co.
   25,000    5.05     6/7/99     25,000
- ----------------------------------------
 TOTAL INSURANCE FUNDING
  AGREEMENTS                   $205,000
- ----------------------------------------
 MUNICIPAL INVESTMENTS--6.2%
 Administration of Environmental &
  Housing Programs--1.4%
           Virginia State HDA
           Mortgage Revenue
           Bonds
 $ 82,225    4.91%    6/2/99   $ 82,225
                               --------
 Amusement & Recreation Services--0.3%
           Maryland Stadium
           Authority Sports
           Facilities Lease
           Revenue Series A
   16,300    5.60     6/1/99     16,300
                               --------
 Communications--0.4%
           New Jersey State
           Economic
           Development
           Authority Revenue
           Refunding Bonds,
           Series B,
           MSNBC/CNBC
           (Chase Manhattan
           Bank LOC)
   24,500    5.64     6/3/99     24,500
                               --------
 Construction--0.2%
           Metal Forming &
           Coining Corp.
           Project (National
           City Bank LOC)
    9,605    4.93     6/4/99      9,605
                               --------
 Executive, Legislative & General
  Government--2.7%
           Kern County
           (California)
           Pension Obligation
   18,000    5.00     6/1/99     18,000
</TABLE>
<TABLE>
<CAPTION>
           Description
- -------------------------------------------------------------
 Principal                    Maturity             Amortized
  Amount   Rate               Date                      Cost
- -------------------------------------------------------------
 <C>       <C>                <S>                 <C>
           Los Angeles County Floating Rate
           TOCR California Pension Obligation
 $ 40,000    4.97%              6/3/99            $   40,000
           Minneapolis City-St.Paul (Minnesota)
           Metro Airport GO Bond
   28,930    5.00               6/1/99                28,930
           Seattle City Washington GO VRDN,
           Series C (Credit Communal de Belgique
           LOC)
   46,525    4.85               6/7/99                46,525
           Sonoma County (California) Pension
           Obligation
   22,800    5.00               6/1/99                22,800
                                                  ----------
                                                     156,255
                                                  ----------
 Health Services--0.8%
           Crozer Keystone Health System VRDN
    7,480    5.69               6/2/99                 7,480
           Health Insurance Plan of Greater New
           York
           VRDN, Series 1990 B-1
   17,500    4.92               6/2/99                17,500
           Michigan State Hospital Finance
           Authority, FRN
   19,950    5.00               6/2/99                19,950
                                                  ----------
                                                      44,930
                                                  ----------
 Real Estate--0.4%
           1800 Harrison Foundation VRDN,
           Series 99-A
   25,000    5.00               6/2/99                25,000
- -------------------------------------------------------------
 TOTAL MUNICIPAL INVESTMENTS                      $  358,815
- -------------------------------------------------------------
 REPURCHASE AGREEMENTS--9.6%
 Repurchase Agreement--8.7%
           ABN-AMRO, Dated 5/28/99
           Repurchase Price $500,274
           (U.S. Government Securities Colld.)
 $500,000    4.93%              6/1/99            $  500,000
                                                  ----------
 Joint Repurchase Agreement--0.9%
           Warburg Dillon Read LLC, Dated 5/28/99
           (U.S. Government Securities Colld.)
           Accrued Interest $120
   50,000    4.80               6/7/99                50,000
- -------------------------------------------------------------
 TOTAL REPURCHASE AGREEMENTS                      $  550,000
- -------------------------------------------------------------
 TOTAL INVESTMENTS--101.3%                        $5,834,343
- -------------------------------------------------------------
 Liabilities, less other assets--(1.3)%              (74,598)
- -------------------------------------------------------------
 NET ASSETS--100.0%                               $5,759,745
- -------------------------------------------------------------
- -------------------------------------------------------------
</TABLE>

See accompanying notes to financial statements.

                                       7
<PAGE>

Northern Institutional Funds
Money Market Portfolios
- --------------------------------------------------------------------------------
Statements of Investments
May 31, 1999
(All amounts in thousands)
(Unaudited)
<TABLE>
<CAPTION>
           Description
- --------------------------------------------------
 Principal               Maturity Amortized
  Amount       Rate        Date      Cost
- --------------------------------------------------
                              Government Portfolio
 <C>       <S>           <C>      <C>
 U.S. GOVERNMENT AGENCIES--68.4%
 Fannie Mae Discount Notes
 Mortgage Backed Securities--9.8%
 $ 50,000    4.82%        7/1/99  $   49,799
   10,000    4.83         7/1/99       9,960
   25,000    4.84         7/1/99      24,899
   25,000    4.85         7/1/99      24,899
   29,000    4.81         8/3/99      28,756
   16,640    4.75        12/1/99      16,238
                                  ----------
                                     154,551
                                  ----------
 Fannie Mae Medium Term FRN--6.4%
   65,000    5.09         6/1/99      64,990
   35,000    4.77         8/5/99      34,975
                                  ----------
                                      99,965
                                  ----------
 Fannie Mae Medium Term Notes--10.5%
   28,000    5.49         8/3/99      27,994
   25,000    5.06        3/15/00      24,983
   13,600    5.10        3/16/00      13,604
   22,000    5.04         4/6/00      21,988
   15,000    4.97        4/12/00      14,989
   25,000    5.11        5/22/00      24,992
   36,060    5.67        5/26/00      36,247
                                  ----------
                                     164,797
                                  ----------
 FFCB Discount Note--1.6%
   25,000    4.75        8/20/99      24,736
                                  ----------
 FFCB Medium Term FRN--1.9%
   30,000    4.70        6/11/99      29,980
                                  ----------
 FHLB Medium Term FRN--4.7%
   24,000    5.11         6/2/99      23,988
   50,000    4.78        8/12/99      49,960
                                  ----------
                                      73,948
                                  ----------
 FHLB Medium Term Notes--7.6%
   39,000    5.53        6/10/99      38,998
   42,000    5.54        7/13/99      41,997
   19,000    5.54        7/15/99      18,998
   20,000    5.16        3/22/00      20,000
                                  ----------
                                     119,993
                                  ----------
</TABLE>
<TABLE>
<CAPTION>
           Description
- ----------------------------------------------------------------------
 Principal                                Maturity          Amortized
  Amount             Rate                   Date               Cost
- ----------------------------------------------------------------------
 <C>       <S>                      <C>                     <C>
 FHLMC Discount Note--25.9%
 $ 25,000    4.75%                                  6/4/99  $   24,990
   25,000    4.74                                  6/16/99      24,951
   20,000    4.77                                  6/22/99      19,944
    7,179    4.75                                  6/30/99       7,152
   50,000    4.69                                  7/12/99      49,674
   22,819    4.63                                  7/26/99      22,658
   50,000    4.64                                   8/5/99      49,581
   60,600    4.70                                   8/6/99      60,078
    6,212    4.71                                   8/6/99       6,158
    5,862    4.76                                  8/23/99       5,798
  137,000    4.83                                  8/26/99     135,421
                                                            ----------
                                                               406,405
- ----------------------------------------------------------------------
 TOTAL U.S. GOVERNMENT AGENCIES                             $1,074,375
- ----------------------------------------------------------------------
 REPURCHASE AGREEMENTS--28.1%
 Repurchase Agreements--24.9%
           Bear Stearns Security Corp., Dated 5/28/99,
           Repurchase Price $350,192
           (U.S. Government Securities Colld.)
 $350,000    4.93%                                  6/1/99  $  350,000
           Merrill Lynch & Co., Inc., Dated 5/28/99,
           Repurchase Price $42,182
           (U.S. Government Securities Colld.)
   42,160    4.65                                   6/1/99      42,160
                                                            ----------
                                                            $  392,160
                                                            ----------
 Joint Repurchase Agreement--3.2%
           Warburg Dillon Reed LLC, Dated 06/25/98,
           (U.S. Government Securities Colld.) Accrued
           Interest $125
   50,000    4.80                                   6/1/99      50,000
- ----------------------------------------------------------------------
 TOTAL REPURCHASE AGREEMENTS                                $  442,160
- ----------------------------------------------------------------------
 TOTAL INVESTMENTS--96.5%                                   $1,516,535
- ----------------------------------------------------------------------
 Other assets, less liabilities--3.5%                           55,105
- ----------------------------------------------------------------------
 NET ASSETS--100.0%                                         $1,571,640
- ----------------------------------------------------------------------
- ----------------------------------------------------------------------
</TABLE>

See accompanying notes to financial statements.

                                       8
<PAGE>

- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                      Description
- -------------------------------------------------------------------------------------------------
Principal                                               Maturity                       Amortized
 Amount                  Rate                             Date                            Cost
- -------------------------------------------------------------------------------------------------
                          Government Select Portfolio
U.S. GOVERNMENT AGENCIES--100.2%
FFCB Discount Note--2.8%
<S>                   <C>                               <C>                            <C>
$ 50,000                 4.70%                            6/1/99                       $   50,000
                                                                                       ----------
FFCB Medium Term FRN--1.7%
  30,000                 4.70                            5/11/00                           29,980
                                                                                       ----------
FFCB Medium Term Notes--7.3%
  37,000                 5.01                            4/28/00                           36,984
  42,000                 5.53                            6/10/99                           41,998
  15,000                 5.54                            7/15/99                           14,999
  25,000                 5.16                             3/8/00                           24,992
  12,000                 5.05                            4/26/00                           11,996
                                                                                       ----------
                                                                                          130,969
                                                                                       ----------
FHLB-FRN--9.5%
  80,000                 4.78                            5/12/99                           79,936
  30,000                 4.92                            4/14/00                           29,987
  60,000                 5.11                            4/14/00                           59,990
                                                                                       ----------
                                                                                          169,913
                                                                                       ----------
FHLB Discount Notes--78.9%
 671,746                 4.68                             6/1/99                          671,746
  57,394                 4.75                             6/2/99                           57,386
  25,000                 4.79                             6/2/99                           24,997
  50,000                 4.81                             6/2/99                           49,993
  19,250                 4.77                             6/4/99                           19,242
  25,000                 4.74                             6/9/99                           24,974
  15,000                 4.72                            6/11/99                           14,980
  25,000                 4.73                            6/11/99                           24,967
  30,000                 4.74                            6/11/99                           29,961
  50,000                 4.74                            6/18/99                           49,888
  50,000                 4.71                            6/30/99                           49,810
   2,000                 4.78                            6/30/99                            1,992
  40,000                 4.67                             7/2/99                           39,839
  25,000                 4.74                             7/7/99                           24,882
  50,000                 4.73                            7/30/99                           49,612
  20,000                 4.73                             8/4/99                           19,832
   8,175                 4.77                             8/4/99                            8,106
  30,000                 4.71                            8/13/99                           29,714
  28,000                 4.80                             9/1/99                           27,657
  25,000                 4.80                            9/03/99                           24,687
  25,000                 4.70                           10/27/99                           24,517
  40,000                 4.68                           10/29/99                           39,220
  40,000                 4.70                            1/19/00                           38,788
  20,000                 4.80                             2/1/00                           19,347
  30,000                 4.82                            2/24/00                           28,924
  20,000                 4.80                            2/28/00                           19,275
                                                                                       ----------
                                                                                        1,414,336
                                                                                       ----------
</TABLE>
<TABLE>
<CAPTION>
Description
- ---------------------------------------------------------------------------------------------------
Principal
 Amount               Rate                       Maturity Date                       Amortized Cost
- ---------------------------------------------------------------------------------------------------
<S>                                                                                  <C>
TOTAL INVESTMENTS--100.2_______________________________________________________________%$1,795,198

Liabilities, less other assets--(0.2)%______________________________________________________(3,888)

NET ASSETS--100.0_______________________________________________________________________$1,791,310%

</TABLE>

See accompanying notes to financial statements.

                                       9
<PAGE>

Northern Institutional Funds
Money Market Portfolios
- --------------------------------------------------------------------------------
Statements of Investments
May 31, 1999
(All amounts in thousands, except shares)
(Unaudited)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
Description
- ---------------------------------------------------------------------------------------------------------
Principal                                                  Maturity                             Amortized
 Amount                  Rate                                Date                                 Cost
- ---------------------------------------------------------------------------------------------------------
                              Tax-Exempt Portfolio
MUNICIPAL INVESTMENTS--97.8%
Alabama--1.4%
Greenville City IDR VRDN,
 Series 1992, Allied-Signal,
 Inc. Project (Allied-Signal,
 Inc. Gtd.)
<S>                      <C>                               <C>                                  <C>
$ 1,350                  3.40%                              6/4/99                              $  1,350
Jefferson County Sewer Revenue
 VRDN, Series A (FGIC Insured)
  5,050                  3.40                               6/4/99                                 5,050
McIntosh IDB Environmental
 Improvement Revenue VRDN,
 Series 1998 D (CIBA Specialty
 Chemical Corp. Gtd.)
  2,000                  3.35                               6/1/99                                 2,000
                                                                                                --------
                                                                                                   8,400
                                                                                                --------
Alaska--0.3%
Alaska Housing Finance Corp.
 VRDN, Series 1994 PT-37,
 Merrill P-Floats (Banque
 National Paris LOC)
  2,065                  3.35                               6/4/99                                 2,065
                                                                                                --------
Arizona--1.4%
Maricopa County Industrialized
 Development
 Authority Hospital Revenue
 VRDN, Series 1998-103, MS
 Floater Certified
  6,200                  3.40                               6/4/99                                 6,200
Maricopa County Pollution
 Control VRDN, Series D,
 Arizona Public Service Co.
 (Bank of America NT & SA LOC)
  2,200                  3.25                               6/1/99                                 2,200
                                                                                                --------
                                                                                                   8,400
                                                                                                --------
California--2.0%
Irvine Ranch Consolidated Water
 District VRDN, Series
 1993 B, District 2, 102, 103,
 & 206
 (Toronto Dominion Bank LOC)
  6,900                  3.25                               6/1/99                                 6,900
San Marcos Public Facilities
 Authority Revenue VRDN, Series
 1989 B BTP-188, Civic Center
 Project
 (U.S. Government Securities
 Colld.)
  4,961                  3.15                               9/2/99                                 4,961
                                                                                                --------
                                                                                                  11,861
                                                                                                --------
Colorado--5.2%
Arapahoe County Capital
 Improvement Highway Revenue
 VRDN, Series E BTP-254,
 Project E-470,
 (U.S. Government Securities
  Colld.)
 14,276                  3.45                               6/4/99                                14,276
Arapahoe County Capital
 Improvement Highway Revenue
 VRDN, Series E BTP-255,
 Project E-470,
 (U.S. Government Securities
 Colld.)
  8,000                  3.45                               6/4/99                                 8,000
Intermountain Power Agency,
 Series B, Goldman Sachs CP
  8,400                  2.80                              6/16/99                                 8,400
                                                                                                --------
                                                                                                  30,676
                                                                                                --------
Delaware--0.2%
Wilmington GO Bonds, Series
 1996 A
 (MBIA Insured)
  1,335                  5.00                              10/1/99                                 1,344
                                                                                                --------
</TABLE>
<TABLE>
<CAPTION>
Description
- -----------------------------------------------------------------------------------------------------
Principal                                                Maturity                           Amortized
 Amount                 Rate                               Date                               Cost
- -----------------------------------------------------------------------------------------------------
Florida--2.9%
Florida State Board of
 Education GO, Series 1989A,
 Eagle Trust 96C0915 (U.S.
 Government Securities Colld.)
<S>                     <C>                              <C>                                <C>
$  5,205                 3.25%                           12/1/99                            $  5,205
Florida State Board of
 Education Public Education
 Capital VRDN, Series 1991 B-
 BTP-223 (U.S. Government
 Securities Colld.)
   4,000                 3.50                             6/4/99                               4,000
Jacksonville PCR VRDN, Series
 199, Florida Power & Light Co.
 Project (Florida Power & Light
 Co Gtd.)
   7,700                 3.30                             6/1/99                               7,700
                                                                                            --------
                                                                                              16,905
                                                                                            --------
Georgia--11.5%
Burke County Development
 Authority PCR VRDN, Series 4,
 Georgia Power Co. Vogtle
 Project (Georgia Power Co.
 Gtd.)
   8,500                 3.35                             6/1/99                               8,500
Burke County Development
 Authority PCR VRDN, Series 4,
 Georgia Power Co. Vogtle
 Project (Georgia Power Co.
 Gtd.)
   3,000                 3.45                             6/1/99                               3,000
Burke County Development
 Authority PCR VRDN, Series
 199, Georgia Power Co. Vogtle
 Project (Georgia Power Co.
 Gtd.)
   2,800                 3.45                             6/1/99                               2,800
Burke County Development
 Authority PCR VRDN, Series
 199, Georgia Power Co. Vogtle
 Project (Georgia Power Co.
 Gtd.)
   9,300                 3.35                             6/1/99                               9,300
DeKalb County Development
 Authority, Marist School, Inc.
 Project (Sun Trust Bank LOC)
   3,500                 3.30                             6/4/99                               3,500
Fulton County Development
 Authority IDR, Citicorp Eagle
 Trust 981001
  11,000                 3.10                             8/2/99                              11,000
Georgia State GO TOB, Series
 1993 F, BTP-82A
   9,900                 3.15                            12/1/99                               9,900
Georgia State GO VRDN, Series
 1994 D, BTP-100
   6,035                 3.15                             8/1/99                               6,035
Metro Atlanta Rapid Transit
 Authority Sales Tax Revenue
 VRDN, Series A-MTC#16, BOCM
 Muni Trust Certified (MBIA
 Insured)
   8,000                 3.47                             6/4/99                               8,000
Putnam County Development Authority PCR
 VRDN, Georgia Power Co. Plant Branch Project
 (Georgia Power Co. Gtd.)
   5,900                 3.35                             6/1/99                               5,900
                                                                                            --------
                                                                                              67,935
                                                                                            --------
</TABLE>

See accompanying notes to financial statements.

                                       10
<PAGE>

- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
Description
- ------------------------------------------------------------------------------------------------------
Principal                                                 Maturity                           Amortized
 Amount                   Rate                              Date                               Cost
- ------------------------------------------------------------------------------------------------------
Illinois--10.5%
Chicago Board of Education
 VRDN, BTP-239
 (AMBAC Insured)
<S>                     <C>                               <C>                                <C>
$  9,320                  3.45%                             6/4/99                            $  9,320
Chicago GO and Refunding GO
 VRDN, Series 1998 M,
 Bank of America Partnership
 (FGIC Insured)
   5,000                  3.70                              8/4/99                               5,000
Chicago O'Hare Airport Revenue
 VRDN, Series 1983-C, AMR, Inc.
 Project (Royal Bank of Canada
 LOC)
   2,500                  3.40                              6/1/99                               2,500
Chicago O'Hare Airport Revenue
 VRDN, Series 1983-D, AMR, Inc.
 Project (Royal Bank of Canada
 LOC)
   2,300                  3.40                              6/1/99                               2,300
Chicago School Reform Board GO,
 Series 1996, Bank of America
 Securities Variable Rate
 Certificates (MBIA Insured)
   8,000                  3.42                              6/4/99                               8,000
Illinois Education Facilities
 Authority VRDN, Cultural
 Pooled Financing Project
 (First National Bank of
 Chicago LOC)
   2,400                  3.25                              6/2/99                               2,400
Illinois Education Facilities
 Authority VRDN, Series 1992,
 The Art Institute of Chicago
   3,000                  3.30                              6/4/99                               3,000
Illinois Education Facilities
 Authority VRDN, Series 1996,
 The Art Institute of Chicago
   8,300                  3.30                              6/4/99                               8,300
Illinois Health Facilities
 Authority VRDN, Series 1993,
 Resurrection Health Care
 System
   3,700                  3.35                              6/1/99                               3,700
Illinois Housing Development
 Authority VRDN,
 Series B-1, Homeowner Mortgage
   2,155                  3.20                             4/27/00                               2,155
Illinois Housing Development
 Authority VRDN,
 Subseries A-1, Homeowner
 Mortgage
   3,820                  3.00                             1/20/00                               3,820
Illinois Sales TRB,
 Series K (U.S. Government
 Securities Colld.)
   1,000                  7.00                            12/15/99                               1,003
Illinois State Sales TRB,
 Series U SG9, Merrill Soc Gen
 Muni Trust (FSA Insured)
   4,500                  3.32                              6/4/99                               4,500
Metropolitan Pier & Exposition
 Authority Dedicated Sales TRB,
 BTP-230 (U.S. Government
 Securities Colld.)
   6,000                  3.45                              6/7/99                               6,000
                                                                                              --------
                                                                                                61,998
                                                                                              --------
Indiana--3.2%
Indiana Bond Bank Operating
 Municipal Notes, Series 1998
 A-2, Advanced Funding Program
   5,000                  3.50                             1/19/00                               5,017
Indiana Transportation
 Authority Highway Revenue
 VRDN, Series 1998A, Citicorp
 Eagle Trust 981402
   7,750                  3.10                              8/2/99                               7,750
</TABLE>
<TABLE>
<CAPTION>
Description
- ------------------------------------------------------------------------------------------------------
Principal                                                 Maturity                           Amortized
 Amount                   Rate                              Date                               Cost
- ------------------------------------------------------------------------------------------------------
Jasper County PCR, Series
 1988D, Northern Indiana Public
 Service Project (Northern
 Indiana Public Service Gtd.)
<S>                     <C>                               <C>                                <C>
$  1,000                  3.15%                            7/15/99                            $  1,000
Jasper County PCR, Series
 1988D, Northern Indiana Public
 Service Project (Northern
 Indiana Public Service Gtd.)
   5,000                  3.20                             9/13/99                               5,000
                                                                                              --------
                                                                                                18,767
                                                                                              --------
Iowa--3.1%
Iowa Finance Authority SFM
 Revenue VRDN,
   9,190                  2.95                             2/23/00                               9,190
Iowa Finance Authority SFM
 Revenue VRDN, Series 1997 A
   5,480                  3.27                              6/1/99                               5,480
Iowa Student Loan Liquidity
 Student Loan Revenue, Series
 1990 I (AMBAC Insured)
   3,500                  3.10                             12/1/99                               3,500
                                                                                              --------
                                                                                                18,170
                                                                                              --------
Kansas--2.3%
Lawrence City GO Temporary
 Notes, Series 1998-1
   6,355                  3.79                              6/1/99                               6,355
Wichita GO Temporary Notes,
 Series 198
   7,000                  3.50                             8/26/99                               7,007
                                                                                              --------
                                                                                                13,362
                                                                                              --------
Kentucky--1.6%
Clark County PCR, Series J-2,
 East Kentucky Power
(National Rural Utilities
 Cooperative Finance Corp.
 Gtd.)
   6,450                  3.10                            10/15/99                               6,450
Danville City Lease Revenue CP,
 Municipal Pooled Lease Program
 (PNC Bank LOC)
   3,045                  3.30                             6/25/99                               3,045
                                                                                              --------
                                                                                                 9,495
                                                                                              --------
Louisiana--1.2%
Greater Baton Rouge Port
 Commission PCR Bonds, Series
 1983-A, Dow Chemical Co.
 Project (Dow Chemical Co.
 Gtd.)
   5,120                  3.20                            12/15/99                               5,120
Huntington City IDR PCR VRDN,
 Allied-Signal, Inc. Project
 (Allied-Signal, Inc. Gtd.)
   2,000                  3.40                              6/4/99                               2,000
                                                                                              --------
                                                                                                 7,120
                                                                                              --------
Maine--1.2%
Maine State GO Municipal
 General Purpose Bond
   4,215                  4.50                             6/15/99                               4,216
Maine State GO Municipal
 Highway Bond
   3,000                  4.50                             6/15/99                               3,001
                                                                                              --------
                                                                                                 7,217
                                                                                              --------
</TABLE>

See accompanying notes to financial statements.

                                       11
<PAGE>

Northern Institutional Funds
Money Market Portfolios
- --------------------------------------------------------------------------------
Statements of Investments
May 31, 1999
(All amounts in thousands)
(Unaudited)
<TABLE>
<CAPTION>
Description
- -----------------------------------------------------------------------------------------------------
Principal                                                Maturity                           Amortized
 Amount                  Rate                              Date                               Cost
- -----------------------------------------------------------------------------------------------------
                        Tax-Exempt Portfolio--Continued
Maryland--1.3%
Maryland State Community
 Development Administration SFM
 Revenue, Series 1993 PT-12,
 Merrill P-Floats
<S>                     <C>                              <C>                                <C>
$  5,620                 3.27%                             6/1/99                            $  5,620
Maryland State Economic
 Development Authority Pooled
 Revenue VRDN, Series 1995
 (NationsBank LOC)
     100                 3.25                              6/4/99                                 100
Montgomery County SFM Revenue
 VRDN, Series PA-40, Merril P-
 Floats
   2,160                 3.32                              6/4/99                               2,160
                                                                                            --------
                                                                                                7,880
                                                                                            --------
Massachusetts--0.9%
Gloucester County Renewal BAN
   5,098                 4.00                              8/7/99                               5,101
                                                                                            --------
Minnesota--1.8%
East Grand Forks Independent
 School District 595 GO,
 Minnesota School District
 Credit Enhancement Program
   2,000                 3.90                             6/30/99                               2,000
Minnesota HFA SFM VRDN, Series
 1998-F
   8,500                 3.65                              8/9/99                               8,500
                                                                                            --------
                                                                                               10,500
                                                                                            --------
Missouri--0.2%
New Madrid Power Revenue VRDN
 (AMBAC Insured)
   1,250                 5.20                             12/1/99                               1,265
                                                                                            --------
Nebraska--0.7%
Nebraska Investment Finance
 Authority SFM, Series 1988 B
 (FGIC Colld.)
   4,000                 3.00                             7/15/99                               4,000
                                                                                            --------
Nevada--1.9%
Clark County School District GO
 VRDN (FSA Insured)
  10,000                 3.47                              6/4/99                              10,000
Nevada State Municipal Bond
 Bank GO VRDN, Series 1997
 SGB31 (FGIC Insured)
   1,000                 3.37                              6/4/99                               1,000
                                                                                            --------
                                                                                               11,000
                                                                                            --------
New Jersey--0.6%
Jersey City Tax Appeal Renewal
 BAN GO
   3,380                3.625                             1/14/00                               3,389
                                                                                            --------
New York--3.6%
New York State Environmental
 Facility Corp. PCR Bond, Eagle
 Trust (FSA Insured)
  10,000                 3.15                            12/15/99                              10,000
New York State Medical Care
 Facilities VRDN, Series B, St.
 Lukes (U.S. Government
 Securities Colld.)
   5,000                 7.45                             2/15/00                               5,221
Pooled Puttable VRDN P-Floats,
 Series PPT2
   1,770                 3.35                              6/1/99                               1,770
Suffolk County TAN, Series I
 (West Deutsche Landes Bank
 LOC)
   4,000                 3.50                             8/12/99                               4,004
                                                                                            --------
                                                                                               20,995
                                                                                            --------
</TABLE>
<TABLE>
<CAPTION>
Description
- ---------------------------------------------------------------------------------------------------------
Principal                                                  Maturity                             Amortized
 Amount                  Rate                                Date                                 Cost
- ---------------------------------------------------------------------------------------------------------
Ohio--4.3%
Cleveland State University
 General Receipts BAN, Series A
<S>                      <C>                               <C>                                  <C>
$  2,124                 3.80%                             8/16/99                              $  2,128
Greystone Revenue Senior VRDN,
 Series Trust 1998-1, (Credit
 Suisse First Boston LOC)
  14,700                 3.40                               6/4/99                                14,700
Ohio Air Quality Facilities
 Revenue Bond, Series 1988A,
 Ohio Edison Co. Project
 (Toronto Dominion Bank LOC)
   4,000                 2.95                               2/1/00                                 4,000
Ohio State Turnpike Commission
 VRDN, Series A (FGIC Insured)
   2,000                 3.47                               6/4/99                                 2,000
Red Roof Inns Mortgage Bond
 Trust VRDN (PNC Bank LOC)
   2,714                 3.65                              6/15/99                                 2,714
                                                                                                --------
                                                                                                  25,542
                                                                                                --------
Oklahoma--0.2%
Tulsa County GO Combined
 Purpose Bond, Industrial
 School District No. 001
   1,000                 4.50                               2/1/00                                 1,010
                                                                                                --------
Pennsylvania--3.0%
Allegheny County Hospital
 Development Authority Revenue
 VRDN, Series A, Presbyterian
 Health Center (MBIA Insured)
     500                 3.30                               6/4/99                                   500
Allegheny County Hospital
 Development Authority Revenue
 VRDN, Series B-1, Presbyterian
 University Hospital (NBD Bank
 LOC)
      40                 3.30                               6/4/99                                    40
Pennsylvania Higher Education
 Facilities Authority Revenue
 VRDN, Var-Assn Independent
 CLGS and UNIVS-D5 (PNC Bank
 LOC)
   2,000                 3.75                               5/1/00                                 2,009
Philadelphia School District
 TRAN, Series 1998/99 A (First
 Union National Bank LOC)
   7,000                 4.25                              6/30/99                                 7,003
Philadelphia TRAN, Series
 1998/99 A
   6,000                 4.25                              6/30/99                                 6,003
Warren County Hospital
 Authority VRDN, Series 1994 B,
 Warren General Hospital
 Project (PNC Bank LOC)
     750                 3.30                               6/4/99                                   750
Washington County Authority
 Lease Revenue, Higher
 Education Pooled Equipment
 Lease (First Union National
 Bank LOC)
   1,080                 3.25                               6/4/99                                 1,080
York City General Authority
 Pooled Financing Revenue,
 Series 1996 (First Union
 National Bank LOC)
      50                 3.30                               6/4/99                                    50
                                                                                                --------
                                                                                                  17,435
                                                                                                --------
</TABLE>

See accompanying notes to financial statements.

                                       12
<PAGE>

- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                       Description
- -----------------------------------------------------------------------------------------------------
Principal                                                  Maturity                         Amortized
 Amount                    Rate                              Date                             Cost
- -----------------------------------------------------------------------------------------------------
South Carolina--3.1%
Beaufort County School District
GO, Series C
<S>                    <C>                                 <C>                              <C>
$  4,655                  3.625%                            2/1/00                          $  4,674
Lexington County Pollution
Control Finance Authority IDR
VRDN, Series 1992A, Allied-
Signal, Inc. Project (Allied-
Signal, Inc. Gtd.)
   1,880                  3.40                              6/4/99                             1,880
Lexington County Revenue IDR
VRDN, Series 1992, Allied-
Signal, Inc. Project (Allied-
Signal, Inc. Gtd.)
     800                  3.40                              6/4/99                               800
Public Service Authority Santee
Cooper VRDN, Series 1998A BTP-
318
  10,670                  3.50                              6/4/99                            10,670
                                                                                            --------
                                                                                              18,024
                                                                                            --------
Tennessee--3.2%
Knox County Health Education
and Housing Facilities Revenue
(Republic of France LOC)
   5,000                  3.45                              6/4/99                             5,000
Memphis GO General Improvement,
Series 1996 SGB-23, Soc Gen
Trust (Memphis Insured)
   5,000                  3.37                              6/4/99                             5,000
Shelby County GO, Series BTP-
263
   5,000                  3.425                             6/4/99                             5,000
Shelby County GO VRDN, Series B
BTP-216
   4,000                  3.17                             12/1/99                             4,000
                                                                                            --------
                                                                                              19,000
                                                                                            --------
Texas--8.7%
Angelina & Neches River
Authority Solid Waste Dispose
Facility VRDN, Series 1984,
TEEC, Inc. Project (Credit
Suisse First Boston LOC)
   3,600                  3.45                              6/1/99                             3,600
Austin City School District
Building and Refunding VRDN,
Series 1996 ML/SG-6 (PSF of
Texas Gtd)
   2,400                  3.32                              6/4/99                             2,400
Denton City Independent School
District GO Bond, Series B (PSF
of Texas Gtd.)
   6,000                  3.65                             8/15/99                             6,000
Harris County Tax Revenue
Receipts
  10,910                  3.45                              6/4/99                            10,910
Harris County Health Facility
Development Corp. School
Healthcare, Series 1997 B
(Sisters of Charity of the
Incar. Gtd.)
   5,000                  3.45                              6/4/99                             5,000
Harris County Health Facility
Development Corp. VRDN, Series
1994, Methodist Hospital
(Methodist Hospital Gtd.)
   1,700                  3.40                              6/1/99                             1,700
San Antonio Electric and Gas
VRDN, Series A
(San Antonio Electric and Gas
Gtd.)
   5,000                  3.47                              6/4/99                             5,000
</TABLE>
<TABLE>
<CAPTION>
                       Description
- -----------------------------------------------------------------------------------------------------
Principal                                                  Maturity                         Amortized
 Amount                   Rate                               Date                             Cost
- -----------------------------------------------------------------------------------------------------
San Antonio Independent School
District GO VRDN, ROCS Series
30 (PSF of Texas Gtd.)
<S>                    <C>                                 <C>                              <C>
$  3,000                  3.47%                             6/4/99                          $  3,000
Texas State TRAN
   7,000                  4.50                             8/31/99                             7,021
Texas State Water Financing
Assistance Refunding GO VRDN,
Series 1998A BTP-309
   5,385                  3.45                              6/4/99                             5,385
Trinity River IDA IDR VRDN,
Automatic Data Processing, Inc.
Project (Automatic Data
Processing, Inc. Gtd.)
   1,300                  3.70                              6/1/99                             1,300
                                                                                            --------
                                                                                              51,316
                                                                                            --------
Utah--2.1%
Utah State GO Highway Bond,
Series 1997 F BTP-256
   7,300                  3.45                              6/4/99                             7,300
Utah State GO VRDN
   5,000                  3.45                              6/4/99                             5,000
                                                                                            --------
                                                                                              12,300
                                                                                            --------
Virginia--4.2%
Norfolk GO VRDN, Eagle Trust
No. 944601
  10,100                  3.42                              6/4/99                            10,100
Roanoke IDA Hospital Revenue
VRDN, Series 1997A, Carilion
Health System Obligated Group
(Carilion Health System Gtd.)
   6,300                  3.40                              6/1/99                             6,300
Town of Louisa IDA PCR CP,
Series 1984, Virginia Electric
& Power Co. Project (Virginia
Electric Power Co. Gtd.)
   3,400                  3.20                             7/14/99                             3,400
Town of Louisa PCR CP, Series
1987, Virginia Electric & Power
Co. Project (Virginia Electric
Power Co. Gtd.)
   4,700                  3.30                             6/25/99                             4,700
                                                                                            --------
                                                                                              24,500
                                                                                            --------
Vermont--0.3%
Vermont HFA SFM Note, Series
10-D
   2,000                  3.10                             4/28/00                             2,000
                                                                                            --------
Washington--5.4%
Washington Health Care
Facilities Authority, Fred
Hutchinson Cancer Research
Center (Morgan Guaranty Trust
Co. LOC)
   3,900                  3.50                              6/1/99                             3,900
Washington Public Power Supply
System VRDN, Series 944701,
Citicorp Eagle Trust
  10,000                  3.47                              6/4/99                            10,000
Washington State GO Bond,
Series E
   2,000                  5.75                              7/1/99                             2,005
Washington State Housing
Finance Commission Single
Family Program Notes
   5,075                  2.95                              2/1/00                             5,075
</TABLE>

See accompanying notes to financial statements.

                                       13
<PAGE>

Northern Institutional Funds
Money Market Portfolios
- --------------------------------------------------------------------------------
Statements of Investments
May 31, 1999
(All amounts in thousands)
(Unaudited)
<TABLE>
<CAPTION>
                       Description
- -----------------------------------------------------------------------------------------------------

Principal                                                  Maturity                         Amortized
 Amount                   Rate                               Date                             Cost
- -----------------------------------------------------------------------------------------------------
                        Tax-Exempt Portfolio--Continued
Washington State Public Power
Supply System Revenue Bond,
Series A, Project 2
<S>                    <C>                                 <C>                              <C>
$  4,000                  5.30%                              7/1/99                         $  4,006
Washington State Public Power
Supply System Revenue Bond,
Series C, Project 2
   1,023                  7.20                               7/1/99                            1,026
Washington State Refunding GO
VRDN, Series R-92-A, BTP-101
   6,000                  3.45                               6/4/99                            6,000
                                                                                            --------
                                                                                              32,012
                                                                                            --------
Wisconsin--3.4%
Kenosha Unified School District
TRAN, Series 1998-99
   4,700                  3.38                              9/28/99                            4,700
Menomonee Falls School District
BAN
   3,325                  4.10                             11/24/99                            3,339
Oshkosh Area School District
BAN
   3,500                  3.33                             12/15/99                            3,502
Racine Unified School District
TRAN, Series 1998/99
   5,000                  4.00                               7/7/99                            5,002
Wisconsin State Transportation
GO Revenue Bond, Series A (FGIC
Insured)
   3,570                  5.00                               7/1/99                            3,576
                                                                                            --------
                                                                                              20,119
                                                                                            --------
</TABLE>
<TABLE>
<CAPTION>
                       Description
- -----------------------------------------------------------------------------------------------------
Principal                                                                                   Amortized
 Amount/                                                   Maturity                           Cost/
 Shares                   Rate                               Date                             Value
- -----------------------------------------------------------------------------------------------------
Wyoming--0.9%
Uinta County PCR Bond, Series
1993, Chevron USA, Inc. Project
(Chevron Oil Gtd.)
<S>                    <C>                                 <C>                              <C>
$1,000                    3.30%                             6/1/99                          $  1,000
Uinta County PCR Bond, Series 1997, Chevron USA, Inc. Project (Chevron Oil
Gtd.)
 4,200                    3.30                              6/1/99                             4,200
                                                                                            --------
                                                                                               5,200
                                                                                            --------
- -----------------------------------------------------------------------------------------------------
TOTAL MUNICIPAL INVESTMENTS                                             $576,303
- -----------------------------------------------------------------------------------------------------
OTHER INVESTMENTS--0.4%
AIM Tax Free Money Market Fund
   382                                                                                      $    382
Dreyfus Tax Exempt Cash Management Fund
   400                                                                                           400
Federated Tax-Free Trust Money
 Market Fund #15
   573                                                                                           573
Federated Tax-Free Trust Money
 Market Fund #73
   320                                                                                           320
Provident Municipal Fund
   597                                                                                           597
</TABLE>
- --------------------------------------------------------------------------------
TOTAL OTHER INVESTMENTS                                                 $  2,272
- --------------------------------------------------------------------------------
TOTAL INVESTMENTS--98.2%                                                $578,575
- --------------------------------------------------------------------------------
Other assets, less liabilities--1.8%                                      10,697
- --------------------------------------------------------------------------------
NET ASSETS--100.0%                                                      $589,272
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

See accompanying notes to financial statements.

                                       14
<PAGE>

Northern Institutional Funds
Money Market Portfolios
- --------------------------------------------------------------------------------
Statements of Assets and Liabilities
May 31, 1999
(All amounts in thousands, except net asset value per share)
(Unaudited)
<TABLE>
<CAPTION>
                                  Diversified             Government   Tax-
                                    Assets     Government   Select    Exempt
                                   Portfolio   Portfolio  Portfolio  Portfolio
- ------------------------------------------------------------------------------
<S>                               <C>          <C>        <C>        <C>
Assets:
Investments in securities, at
 amortized cost                   $5,284,343   $1,074,375 $1,795,198 $578,575
Repurchase agreements, at cost       550,000      442,160         --       --
Cash                                      --            1          1       --
Receivables:
 Fund shares sold                    198,976       96,046     10,487    1,313
 Interest                             19,458        4,453      2,820    6,991
 Investment securities sold               --           --         --    6,625
 Administrator                            98           38         42       21
Other assets                             139           60         67       43
- ------------------------------------------------------------------------------
Total assets                       6,053,014    1,617,133  1,808,615  593,568
- ------------------------------------------------------------------------------
Liabilities:
Payable for:
 Fund shares redeemed                269,407       38,800      9,681    2,546
 Distributions to shareholders        21,946        6,105      7,211    1,521
Accrued expenses:
 Advisory fees                         1,178          338        156      124
 Administration fees                     471          135        156       50
 Custodian fees                           31           22         11       14
 Service agent fees                       11           --         --       --
 Transfer agent fees                       6            6         --       --
Other liabilities                        219           87         90       41
- ------------------------------------------------------------------------------
Total liabilities                    293,269       45,493     17,305    4,296
- ------------------------------------------------------------------------------
Net assets                        $5,759,745   $1,571,640 $1,791,310 $589,272
- ------------------------------------------------------------------------------
Analysis of net assets:
Paid-in capital                   $5,760,620   $1,571,613 $1,791,304 $589,183
Accumulated net realized gains
 (losses) on investment
 transactions                           (875)          27          6       89
- ------------------------------------------------------------------------------
Net assets                        $5,759,745   $1,571,640 $1,791,310 $589,272
- ------------------------------------------------------------------------------
Total shares outstanding (no par
 value), unlimited shares
 authorized
 Shares                            5,725,377    1,533,372  1,787,641  589,145
 Service Shares                       34,212       25,459      3,272       38
 Premier Shares                        1,031       12,802        392       --
- ------------------------------------------------------------------------------
Net asset value, offering and
 redemption price per share
 Shares                           $     1.00   $     1.00 $     1.00 $   1.00
 Service Shares                   $     1.00   $     1.00 $     1.00 $   1.00
 Premier Shares                   $     1.00   $     1.00 $     1.00       --
- ------------------------------------------------------------------------------
</TABLE>

See accompanying notes to financial statements.

                                       15
<PAGE>

Northern Institutional Funds
Money Market Portfolios
- --------------------------------------------------------------------------------
Statements of Operations
For the Six Months Ended May 31, 1999
(All amounts in thousands)
(Unaudited)
<TABLE>
<CAPTION>
                                   Diversified            Government
                                     Assets    Government   Select   Tax-Exempt
                                    Portfolio  Portfolio  Portfolio  Portfolio
- -------------------------------------------------------------------------------
<S>                                <C>         <C>        <C>        <C>
Interest income                     $127,398    $36,406    $ 44,542   $11,854
- -------------------------------------------------------------------------------
Expenses:
Investment advisory fees               6,209      1,831       2,255       938
Administration fees                    2,484        732         902       375
Registration fees                        292         56          57        38
Custodian fees                           253         93          95        55
Professional fees                        129         44          51        21
Shareholders servicing fees              119         17           1        --
Transfer agent fees                       74         17          15         9
Trustee fees and expenses                 60         21          24        10
Other                                     73         33          36        24
- -------------------------------------------------------------------------------
Total expenses                         9,693      2,844       3,436     1,470
Less voluntary waivers of invest-
 ment advisory fees                       --         --      (1,353)       --
Less expenses reimbursable by Ad-
 ministrator                            (791)      (244)       (264)     (150)
- -------------------------------------------------------------------------------
Net expenses                           8,902      2,600       1,819     1,320
- -------------------------------------------------------------------------------
Net investment income                118,496     33,806      42,723    10,534
Net realized gains on investment
 transactions                             62         12           2        34
- -------------------------------------------------------------------------------
Net increase in net assets re-
 sulting from operations            $118,558    $33,818    $ 42,725   $10,568
- -------------------------------------------------------------------------------
</TABLE>

See accompanying notes to financial statements.

                                       16
<PAGE>

Northern Institutional Funds
Money Market Portfolios
- --------------------------------------------------------------------------------
Statements of Changes in Net Assets
For the Six Months Ended May 31, 1999 (Unaudited) and the year ended November
30, 1998
(All amounts in thousands)

<TABLE>
<CAPTION>
                         Diversified Assets            Government           Government Select          Tax-Exempt
                              Portfolio                Portfolio                Portfolio               Portfolio
                       ------------------------  -----------------------  ----------------------  ----------------------
                          1999         1998         1999        1998         1999        1998        1999        1998
- -------------------------------------------------------------------------------------------------------------------------
<S>                    <C>          <C>          <C>         <C>          <C>         <C>         <C>         <C>
Increase (decrease)
in net assets from
operations:
 Net investment
 income                $   118,496  $   218,012  $   33,806  $    69,654  $   42,723  $   77,613  $   10,534  $   22,415
 Net realized gains
 on investment
 transactions                   62          430          12          108           2           2          34          61
- -------------------------------------------------------------------------------------------------------------------------
Net increase in net
assets resulting from
operations                 118,558      218,442      33,818       69,762      42,725      77,615      10,568      22,476
- -------------------------------------------------------------------------------------------------------------------------
Distributions to
shareholders:
 Net investment
 income                   (116,909)    (217,888)    (33,641)     (69,654)    (42,717)    (77,613)    (10,534)    (22,415)
 Realized Gains                 --           --          --           --          --          --          --        (174)
- -------------------------------------------------------------------------------------------------------------------------
Total distributions
to shareholders           (116,909)    (217,888)    (33,641)     (69,654)    (42,717)    (77,613)    (10,534)    (22,589)
- -------------------------------------------------------------------------------------------------------------------------
Distributions to
Service shareholders:
 Net investment
 income                     (1,578)        (124)       (100)          --          (2)         --          --          --
- -------------------------------------------------------------------------------------------------------------------------
Total distributions
to Service
shareholders                (1,578)        (124)       (100)          --          (2)         --          --          --
- -------------------------------------------------------------------------------------------------------------------------
Distributions to
Premier shareholders:
 Net investment
 income                         (9)          --         (65)          --          (4)         --          --          --
- -------------------------------------------------------------------------------------------------------------------------
Total distributions
to Premier
shareholders                    (9)          --         (65)          --          (4)         --          --          --
- -------------------------------------------------------------------------------------------------------------------------
Share transactions
(at $1.00 per share):
 Proceeds from the
 sale of shares         27,678,455   53,687,791   9,269,866   16,723,046   4,475,814   8,794,437   2,817,964   5,796,229
 Reinvested
 distributions               4,615        9,197       1,010          748       2,144       5,934         130         210
 Cost of shares
 redeemed              (26,753,460) (52,844,174) (9,390,379) (16,122,433) (4,385,183) (8,344,898) (2,977,045) (5,633,334)
- -------------------------------------------------------------------------------------------------------------------------
Net increase
(decrease) in net
assets resulting from
share transactions         929,610      852,814    (119,503)     601,361      92,775     455,473    (158,951)    163,105
- -------------------------------------------------------------------------------------------------------------------------
Service share
transactions (at
$1.00 per share):
 Proceeds from the
 sale of shares            293,863       21,636      33,103           --       3,273          --          46          --
 Cost of shares
 redeemed                 (266,711)     (14,576)     (7,644)          --          --          --          (8)         --
- -------------------------------------------------------------------------------------------------------------------------
Net increase in net
assets resulting from
Service share
transactions                27,152        7,060      25,459           --       3,273          --          38          --
- -------------------------------------------------------------------------------------------------------------------------
Premier share
transactions (at
$1.00 per share):
 Proceeds from the
 sale of shares              4,631           --      40,945           --       1,552         110          --          --
 Cost of shares
 redeemed                   (3,600)          --     (28,143)          --      (1,269)         (1)         --          --
- -------------------------------------------------------------------------------------------------------------------------
Net increase in net
assets resulting from
Premier share
transactions                 1,031           --      12,802           --         283         109          --          --
- -------------------------------------------------------------------------------------------------------------------------
Net increase
(decrease)                 957,855      860,304     (81,230)     601,469      96,333     455,584    (158,879)    162,992
Net assets--beginning
of period                4,801,890    3,941,586   1,652,870    1,051,401   1,694,977   1,239,393     748,151     585,159
- -------------------------------------------------------------------------------------------------------------------------
Net assets--end of
period                 $ 5,759,745  $ 4,801,890  $1,571,640  $ 1,652,870  $1,791,310  $1,694,977  $  589,272  $  748,151
- -------------------------------------------------------------------------------------------------------------------------
</TABLE>

See accompanying notes to financial statements.

                                       17
<PAGE>

Northern Institutional Funds
Money Market Portfolios
- -------------------------------------------------------------------------------
Financial Highlights
For the Six Months Ended May 31, 1999 (Unaudited) and the Years Ended November
30,
Diversified Assets Portfolio
<TABLE>
<CAPTION>
                                                                      Shares
                   --------------------------------------------------------------------------------------------------------------
                      1999        1998        1997        1996        1995           1994        1993        1992        1991
- ---------------------------------------------------------------------------------------------------------------------------------
<S>                <C>         <C>         <C>         <C>         <C>            <C>         <C>         <C>         <C>
Net asset value,
beginning of pe-
riod                    $1.00       $1.00       $1.00       $1.00       $1.00          $1.00       $1.00       $1.00       $1.00
Income from in-
vestment opera-
tions:
 Net investment
 income                  0.02        0.05        0.05        0.05        0.06           0.04        0.03        0.04        0.06
- ---------------------------------------------------------------------------------------------------------------------------------
Total income from
investment opera-
tions                    0.02        0.05        0.05        0.05        0.06           0.04        0.03        0.04        0.06
- ---------------------------------------------------------------------------------------------------------------------------------
Distributions to
shareholders
from:
 Net investment
 income                 (0.02)      (0.05)      (0.05)      (0.05)      (0.06)         (0.04)      (0.03)      (0.04)      (0.06)
- ---------------------------------------------------------------------------------------------------------------------------------
Total distribu-
tions to share-
holders                 (0.02)      (0.05)      (0.05)      (0.05)      (0.06)         (0.04)      (0.03)      (0.04)      (0.06)
- ---------------------------------------------------------------------------------------------------------------------------------
Net asset value,
end of period           $1.00       $1.00       $1.00       $1.00       $1.00          $1.00       $1.00       $1.00       $1.00
- ---------------------------------------------------------------------------------------------------------------------------------
Total return (a)         2.39%       5.36%       5.42%       5.30%       5.78%(b)       3.92%       3.00%       3.80%       6.19%
Ratio to average
net assets of
(c):
 Expenses, net of
 waivers and
 reimbursements          0.35%       0.35%       0.35%       0.34%       0.34%          0.35%       0.34%       0.34%       0.35%
 Expenses, before
 waivers and
 reimbursements          0.38%       0.38%       0.36%       0.34%       0.34%          0.35%       0.36%       0.35%       0.36%
 Net investment
 income, net of
 waivers and
 reimbursements          4.78%       5.31%       5.30%       5.18%       5.63%          3.74%       3.00%       3.79%       6.18%
 Net investment
 income, before
 waivers and
 reimbursements          4.75%       5.28%       5.29%       5.18%       5.63%          3.74%       2.98%       3.78%       6.17%
Net assets at end
of period (in
thousands)         $5,724,501  $4,794,830  $3,941,586  $3,179,529  $2,610,347     $2,891,880  $3,200,288  $2,801,744  $2,784,485
- ---------------------------------------------------------------------------------------------------------------------------------
<CAPTION>
                      1990
- ---------------------------------------------------------------------------------------------------------------------------------
<S>                <C>
Net asset value,
beginning of pe-
riod                    $1.00
Income from in-
vestment opera-
tions:
 Net investment
 income                  0.08
- ---------------------------------------------------------------------------------------------------------------------------------
Total income from
investment opera-
tions                    0.08
- ---------------------------------------------------------------------------------------------------------------------------------
Distributions to
shareholders
from:
 Net investment
 income                 (0.08)
- ---------------------------------------------------------------------------------------------------------------------------------
Total distribu-
tions to share-
holders                 (0.08)
- ---------------------------------------------------------------------------------------------------------------------------------
Net asset value,
end of period           $1.00
- ---------------------------------------------------------------------------------------------------------------------------------
Total return (a)         8.01%
Ratio to average
net assets of
(c):
 Expenses, net of
 waivers and
 reimbursements          0.35%
 Expenses, before
 waivers and
 reimbursements          0.36%
 Net investment
 income, net of
 waivers and
 reimbursements          8.01%
 Net investment
 income, before
 waivers and
 reimbursements          8.00%
Net assets at end
of period (in
thousands)         $2,192,756
- ---------------------------------------------------------------------------------------------------------------------------------
</TABLE>

<TABLE>
<CAPTION>
                                                 Service       Premier
                                             ----------------- --------
                                              1999    1998 (d) 1999 (e)
- -----------------------------------------------------------------------
<S>                                          <C>      <C>      <C>
Net asset value, beginning of period           $1.00    $1.00    $1.00
Income from investment operations:
 Net investment income                          0.02     0.02       --
- -----------------------------------------------------------------------
Total income from investment operations         0.02     0.02       --
- -----------------------------------------------------------------------
Distributions to shareholders from:
 Net investment income                         (0.02)   (0.02)      --
- -----------------------------------------------------------------------
Total distributions to shareholders            (0.02)   (0.02)      --
- -----------------------------------------------------------------------
Net asset value, end of period                 $1.00    $1.00    $1.00
- -----------------------------------------------------------------------
Total return (a)                                2.22%    1.76%    0.67%
Ratio to average net assets of (c):
 Expenses, net of waivers and reimbursements    0.69%    0.69%    0.95%
 Expenses, before waivers and reimbursements    0.72%    0.72%    0.99%
 Net investment income, net of waivers and
 reimbursements                                 4.44%    4.94%    4.18%
 Net investment income, before waivers and
 reimbursements                                 4.41%    4.91%    4.15%
Net assets at end of period (in thousands)   $34,213   $7,060   $1,031
- -----------------------------------------------------------------------
</TABLE>
(a) Assumes investment at net asset value at the beginning of the period,
    reinvestment of all dividends and distributions, and a complete redemption
    of the investment at the net asset value at the end of the period. Total
    return is not annualized for periods less than one year.
(b) Total return for the year ended November 30, 1995 would have been 5.73%
    absent the effect of a capital contribution equivalent to $.0005 per share
    received from Northern Trust Corporation.
(c) Annualized for periods less than one year.
(d) For the period July 1, 1998 (Service Shares issue date) through November
    30, 1998.
(e) For the period April 1, 1999 (Premier Shares issue date) through May 31,
    1999.
See accompanying notes to financial statements.

                                       18
<PAGE>

Northern Institutional Funds
Money Market Portfolios
- -------------------------------------------------------------------------------
Financial Highlights
For the Six Months Ended May 31, 1999 (Unaudited) and the Years Ended November
30,
Government Portfolio

<TABLE>
<CAPTION>
                                                                  Shares
                   --------------------------------------------------------------------------------------------------------
                      1999        1998        1997        1996       1995         1994       1993        1992       1991
- ---------------------------------------------------------------------------------------------------------------------------
<S>                <C>         <C>         <C>         <C>         <C>          <C>       <C>         <C>         <C>
Net asset value,
beginning of
period             $     1.00  $     1.00  $     1.00  $     1.00  $   1.00     $   1.00  $     1.00  $     1.00  $   1.00
Income from
investment
operations:
 Net investment
 income                  0.03        0.04        0.05        0.05      0.06         0.04        0.03        0.04      0.06
- ---------------------------------------------------------------------------------------------------------------------------
Total income from
investment
operations               0.03        0.04        0.05        0.05      0.06         0.04        0.03        0.04      0.06
- ---------------------------------------------------------------------------------------------------------------------------
Distributions to
shareholders
from:
 Net investment
 income                 (0.03)      (0.04)      (0.05)      (0.05)    (0.06)       (0.04)      (0.03)      (0.04)    (0.06)
- ---------------------------------------------------------------------------------------------------------------------------
Total
distributions to
shareholders            (0.03)      (0.04)      (0.05)      (0.05)    (0.06)       (0.04)      (0.03)      (0.04)    (0.06)
- ---------------------------------------------------------------------------------------------------------------------------
Net asset value,
end of period      $     1.00  $     1.00  $     1.00  $     1.00  $   1.00     $   1.00  $     1.00  $     1.00  $   1.00
- ---------------------------------------------------------------------------------------------------------------------------
Total return (a)         2.31%       5.28%       5.31%       5.20%     5.64%(b)     3.78%       2.91%       3.91%     6.18%
Ratio to average
net assets of
(c):
 Expenses, net of
 waivers and
 reimbursements          0.35%       0.35%       0.35%       0.35%     0.35%        0.34%       0.34%       0.34%     0.35%
 Expenses, before
 waivers and
 reimbursements          0.39%       0.40%       0.37%       0.38%     0.40%        0.41%       0.38%       0.40%     0.40%
Net investment
income, net of
waivers and
reimbursements           4.62%       5.22%       5.18%       5.08%     5.49%        3.60%       2.92%       3.71%     6.03%
Net investment
income, before
waivers and
reimbursements           4.58%       5.17%       5.16%       5.05%     5.44%        3.53%       2.88%       3.65%     5.98%
Net assets at end
of period (in
thousands)         $1,533,379  $1,652,870  $1,051,401  $1,268,515  $850,664     $787,816  $1,065,705  $1,163,905  $895,405
- ---------------------------------------------------------------------------------------------------------------------------
<CAPTION>
                     1990
- ---------------------------------------------------------------------------------------------------------------------------
<S>                <C>
Net asset value,
beginning of
period             $   1.00
Income from
investment
operations:
 Net investment
 income                0.08
- ---------------------------------------------------------------------------------------------------------------------------
Total income from
investment
operations             0.08
- ---------------------------------------------------------------------------------------------------------------------------
Distributions to
shareholders
from:
 Net investment
 income               (0.08)
- ---------------------------------------------------------------------------------------------------------------------------
Total
distributions to
shareholders          (0.08)
- ---------------------------------------------------------------------------------------------------------------------------
Net asset value,
end of period      $   1.00
- ---------------------------------------------------------------------------------------------------------------------------
Total return (a)       7.89%
Ratio to average
net assets of
(c):
 Expenses, net of
 waivers and
 reimbursements        0.37%
 Expenses, before
 waivers and
 reimbursements        0.46%
Net investment
income, net of
waivers and
reimbursements         7.88%
Net investment
income, before
waivers and
reimbursements         7.79%
Net assets at end
of period (in
thousands)         $971,720
- ---------------------------------------------------------------------------------------------------------------------------
</TABLE>
<TABLE>
<CAPTION>
                                              Service     Premier
                                             ----------  ----------
                                              1999 (d)    1999 (e)
- -------------------------------------------------------------------
<S>                                          <C>         <C>
Net asset value, beginning of period         $     1.00  $     1.00
Income from investment operations:
 Net investment income                             0.01        0.02
- -------------------------------------------------------------------
Total income from investment operations            0.01        0.02
- -------------------------------------------------------------------
Distributions to shareholders from:
 Net investment income                            (0.01)      (0.02)
- -------------------------------------------------------------------
Total distributions to shareholders               (0.01)      (0.02)
- -------------------------------------------------------------------
Net asset value, end of period               $     1.00  $     1.00
- -------------------------------------------------------------------
Total return (a)                                   0.68%       1.85%
Ratio to average net assets of (c):
 Expenses, net of waivers and reimbursements       0.69%       0.95%
 Expenses, before waivers and reimbursements       0.73%       0.99%
 Net investment income, net of waivers and
 reimbursements                                    4.28%       4.02%
 Net investment income, before waivers and
 reimbursements                                    4.24%       3.98%
Net assets at end of period (in thousands)   $   25,459  $   12,802
- -------------------------------------------------------------------
</TABLE>

(a)  Assumes investment at net asset value at the beginning of the period,
     reinvestment of all dividends and distributions, and a complete
     redemption of the investment at the net asset value at the end of the
     period. Total return is not annualized for periods less than one year.
(b)  Total return for the year ended November 30, 1995 would have been 5.53%
     absent the effect of a capital contribution equivalent to $.0011 per
     share received from Northern Trust Corporation.
(c) Annualized for periods less than one year.
(d)  For the period April 1, 1999 (Service Shares issue date) through May 31,
     1999.
(e)  For the period December 15, 1998 (Premier Shares issue date) through May
     31, 1999.

See accompanying notes to financial statements.

                                       19
<PAGE>

Northern Institutional Funds
Money Market Portfolios
- -------------------------------------------------------------------------------
Financial Highlights
For the Six Months Ended May 31, 1999 (Unaudited) and the Years Ended November
30,
Government Select Portfolio

<TABLE>
<CAPTION>
                                                                     Shares
                         --------------------------------------------------------------------------------------------------
                            1999        1998        1997       1996      1995         1994      1993      1992      1991
- ---------------------------------------------------------------------------------------------------------------------------
<S>                      <C>         <C>         <C>         <C>       <C>          <C>       <C>       <C>       <C>
Net asset value,
beginning of period      $     1.00  $     1.00  $     1.00  $   1.00  $   1.00     $   1.00  $   1.00  $   1.00  $   1.00
Income from investment
operations:
 Net investment income         0.02        0.05        0.05      0.05      0.06         0.04      0.03      0.04      0.06
- ---------------------------------------------------------------------------------------------------------------------------
Total income from
investment operations:         0.02        0.05        0.05      0.05      0.06         0.04      0.03      0.04      0.06
- ---------------------------------------------------------------------------------------------------------------------------
Distributions to
shareholders from:
- ---------------------------------------------------------------------------------------------------------------------------
 Net investment income        (0.02)      (0.05)      (0.05)    (0.05)    (0.06)       (0.04)    (0.03)    (0.04)    (0.06)
- ---------------------------------------------------------------------------------------------------------------------------
Total distributions to
shareholders                  (0.02)      (0.05)      (0.05)    (0.05)    (0.06)       (0.04)    (0.03)    (0.04)    (0.06)
- ---------------------------------------------------------------------------------------------------------------------------
Net asset value, end of
period                   $     1.00  $     1.00  $     1.00  $   1.00  $   1.00     $   1.00  $   1.00  $   1.00  $   1.00
- ---------------------------------------------------------------------------------------------------------------------------
Total return (b)               2.37%       5.38%       5.41%     5.31%     5.82%(c)     3.84%     3.00%     3.71%     5.82%
Ratio to average net
assets of (d):
 Expenses, net of
 waivers and
 reimbursements                0.20%       0.20%       0.20%     0.20%     0.20%        0.20%     0.20%     0.20%     0.20%
 Expenses, before
 waivers and
 reimbursements                0.38%       0.39%       0.39%     0.40%     0.41%        0.43%     0.49%     0.52%     0.60%
 Net investment income,
 net of waivers and
 reimbursements                4.74%       5.31%       5.30%     5.19%     5.67%        3.83%     2.99%     3.70%     5.78%
 Net investment income,
 before waivers and
 reimbursements                4.56%       5.12%       5.11%     4.99%     5.46%        3.60%     2.70%     3.38%     5.38%
Net assets at end of
period (in thousands)    $1,787,646  $1,694,869  $1,239,393  $836,349  $685,142     $493,718  $386,507  $264,756  $160,750
- ---------------------------------------------------------------------------------------------------------------------------
<CAPTION>
                         1990(a)
- ---------------------------------------------------------------------------------------------------------------------------
<S>                      <C>
Net asset value,
beginning of period      $  1.00
Income from investment
operations:
 Net investment income      0.01
- ---------------------------------------------------------------------------------------------------------------------------
Total income from
investment operations:      0.01
- ---------------------------------------------------------------------------------------------------------------------------
Distributions to
shareholders from:
- ---------------------------------------------------------------------------------------------------------------------------
 Net investment income     (0.01)
- ---------------------------------------------------------------------------------------------------------------------------
Total distributions to
shareholders               (0.01)
- ---------------------------------------------------------------------------------------------------------------------------
Net asset value, end of
period                   $  1.00
- ---------------------------------------------------------------------------------------------------------------------------
Total return (b)            0.50%
Ratio to average net
assets of (d):
 Expenses, net of
 waivers and
 reimbursements             0.20%
 Expenses, before
 waivers and
 reimbursements             1.33%
 Net investment income,
 net of waivers and
 reimbursements             7.65%
 Net investment income,
 before waivers and
 reimbursements             6.52%
Net assets at end of
period (in thousands)    $44,215
- ---------------------------------------------------------------------------------------------------------------------------
</TABLE>

<TABLE>
<CAPTION>
                                             Service      Premier
                                             -------- ----------------
                                             1999 (e)  1999   1998 (f)
- ---------------------------------------------------------------------
<S>                                          <C>      <C>     <C>
Net asset value, beginning of period          $ 1.00  $ 1.00   $ 1.00
Income from investment operations:
 Net investment income                           --     0.02      --
- ---------------------------------------------------------------------
Total income from investment operations          --     0.02      --
- ---------------------------------------------------------------------
Distributions to shareholders from:
 Net investment income                           --    (0.02)     --
- ---------------------------------------------------------------------
Total distributions to shareholders              --    (0.02)     --
- ---------------------------------------------------------------------
Net asset value, end of period                $ 1.00  $ 1.00   $ 1.00
- ---------------------------------------------------------------------
Total return (a)                                0.36%   1.99%    0.10%
Ratio to average net assets of (d):
 Expenses, net of waivers and reimbursements    0.54%   0.80%    0.80%
 Expenses, before waivers and reimbursements    0.72%   0.98%    0.99%
 Net investment income, net of waivers and
 reimbursements                                 4.40%   4.14%    4.71%
 Net investment income, before waivers and
 reimbursements                                 4.22%   3.96%    4.52%
Net assets at end of period (in thousands)    $3,273  $  391   $  108
- ---------------------------------------------------------------------
</TABLE>

(a) For the period November 7, 1990 (commencement of operations) through
    November 30, 1990.
(b) Assumes investment at net asset value at the beginning of the period,
 reinvestment of all dividends and distributions, and a complete redemption of
 the investment at the net asset value at the end of the period. Total return
 is not annualized for periods less than one year.
(c) Total return for the year ended November 30, 1995 would have been 5.80%
    absent the effect of a capital contribution equivalent to $.0002 per share
    received from Northern Trust Corporation.
(d) Annualized for periods less than one year.
(e) For the period May 28, 1999 (Service Shares issue date) through May 31,
    1999.
(f) For the period November 23, 1998 (Premier Shares issue date) through
    November 30, 1998.

See accompanying notes to financial statements.

                                       20
<PAGE>

Northern Institutional Funds
Money Market Portfolios
- --------------------------------------------------------------------------------
Financial Highlights
For the Six Months Ended May 31, 1999 (Unaudited) and the Years Ended November
30,
Tax-Exempt Portfolio

<TABLE>
<CAPTION>
                                                                    Shares
                         ------------------------------------------------------------------------------------------------------
                           1999      1998      1997      1996      1995      1994       1993        1992       1991      1990
- --------------------------------------------------------------------------------------------------------------------------------
<S>                      <C>       <C>       <C>       <C>       <C>       <C>       <C>         <C>         <C>       <C>
Net asset value,
beginning of period         $1.00     $1.00     $1.00     $1.00     $1.00     $1.00       $1.00       $1.00     $1.00     $1.00
Income from investment
operations:
 Net investment income       0.01      0.03      0.03      0.03      0.04      0.02        0.02        0.03      0.05      0.06
- --------------------------------------------------------------------------------------------------------------------------------
Total income from
investment operations        0.01      0.03      0.03      0.03      0.04      0.02        0.02        0.03      0.05      0.06
- --------------------------------------------------------------------------------------------------------------------------------
Distributions to
shareholders from:
 Net investment income      (0.01)    (0.03)    (0.03)    (0.03)    (0.04)    (0.02)      (0.02)      (0.03)    (0.05)    (0.06)
- --------------------------------------------------------------------------------------------------------------------------------
Total distributions to
shareholders                (0.01)    (0.03)    (0.03)    (0.03)    (0.04)    (0.02)      (0.02)      (0.03)    (0.05)    (0.06)
- --------------------------------------------------------------------------------------------------------------------------------
Net asset value, end of
period                      $1.00     $1.00     $1.00     $1.00     $1.00     $1.00       $1.00       $1.00     $1.00     $1.00
- --------------------------------------------------------------------------------------------------------------------------------
Total return (a)             1.42%     3.31%     3.44%     3.37%     3.71%     2.62%       2.27%       2.97%     4.57%     5.71%
Ratio to average net
assets of (b):
 Expenses, net of
 waivers and
 reimbursements              0.35%     0.35%     0.35%     0.35%     0.35%     0.35%       0.34%       0.34%     0.35%     0.36%
 Expenses, before
 waivers and
 reimbursements              0.39%     0.39%     0.39%     0.40%     0.41%     0.36%       0.38%       0.39%     0.40%     0.43%
 Net investment income,
 net of waivers and
 reimbursements              2.81%     3.27%     3.38%     3.32%     3.63%     2.40%       2.27%       2.95%     4.57%     5.71%
 Net investment income,
 before waivers and
 reimbursements              2.77%     3.23%     3.34%     3.27%     3.57%     2.39%       2.23%       2.90%     4.52%     5.64%
Net assets at end of
period (in thousands)    $589,234  $748,151  $585,159  $638,507  $803,730  $853,103  $1,191,932  $1,226,480  $872,405  $752,257
- --------------------------------------------------------------------------------------------------------------------------------
</TABLE>

<TABLE>
<CAPTION>
                                  Service
                                  --------
                                  1999 (c)
- --------------------------------------
<S>                               <C>
Net asset value, beginning of
period                             $1.00
Income from investment
operations:
 Net investment income                --
- --------------------------------------
Total income from investment
operations                            --
- --------------------------------------
Distributions to shareholders
from:
 Net investment income                --
- --------------------------------------
Total distributions to
shareholders                          --
- --------------------------------------
Net asset value, end of period     $1.00
- --------------------------------------
Total return (a)                    0.13%
Ratio to average net assets of
(b):
 Expenses, net of waivers and
 reimbursements                     0.69%
 Expenses, before waivers and
 reimbursements                     0.73%
 Net investment income, net of
 waivers and reimbursements         2.47%
 Net investment income, before
 waivers and reimbursements         2.43%
Net assets at end of period (in
thousands)                         $  38
- --------------------------------------
</TABLE>
(a) Assumes investment at net asset value at the beginning of the period,
    reinvestment of all dividends and distributions, and a complete redemption
    of the investment at the end of the period. Total return is not annualized
    for periods less than one year.
(b) Annualized for period less than one year.
(c) For the period May 13, 1999 (Service Shares issue date) through May 31,
    1999.

See accompanying notes to financial statements.

                                       21
<PAGE>

Northern Institutional Funds
Money Market Portfolios
- -------------------------------------------------------------------------------
Notes to Financial Statements
May 31, 1999
(Unaudited)
1. Organization
Northern Institutional Funds (the "Trust") is a Delaware business trust which
was formed on July 1, 1997, and is registered under the Investment Company Act
of 1940 (as amended) as an open-end management investment company. The Trust,
formerly known as The Benchmark Funds, changed its name effective July 15,
1998. The Trust includes seventeen portfolios, each with its own investment
objective. Prior to March 31, 1998, each portfolio was a series of The
Benchmark Funds, a Massachusetts business trust, which reorganized into the
Trust at the close of business on that date. The Northern Trust Company
("Northern") is the investment adviser for all of the Trust's money market
portfolios and is the custodian and transfer agent for the Trust. Effective
May 1, 1999, Northern and First Data Investor Services Group, Inc. ("Investor
Services Group") became the Trust's co-administrators, and First Data
Distributors, Inc. ("FDDI"), an affiliate of Investor Services Group, became
the Trust's distributor. Presented herein are the financial statements of the
money market portfolios.
 The Trust includes four diversified money market portfolios: Diversified
Assets Portfolio, Government Portfolio, Government Select Portfolio and Tax-
Exempt Portfolio (the "Portfolios"). Each of these Portfolios has three
classes of shares: Shares, Service Shares and Premier Shares. Each class is
distinguished by the level of administrative, liaison and transfer agent
service provided. As of May 31, 1999, all three classes of shares were
outstanding for each Portfolio with the exception of Tax-Exempt Portfolio
Premier Shares.

2. Significant Accounting Policies
The following is a summary of significant accounting policies consistently
followed by the Portfolios in the preparation of their financial statements.
These policies are in conformity with generally accepted accounting principles
("GAAP"). The presentation of financial statements in conformity with GAAP
requires management to make estimates and assumptions that affect the reported
amounts of assets and liabilities at the date of the financial statements and
the reported amounts of revenues and expenses during the reporting period.
Actual results could differ from those estimates.

(a) Investment Valuation
Investments are valued at amortized cost, which approximates market value.
Under the amortized cost method, investments purchased at a discount or
premium are valued by amortizing the difference between the original purchase
price and maturity value of the issue over the period to maturity.

(b) Repurchase Agreements
During the term of a repurchase agreement, the market value of the underlying
collateral, including accrued interest, is required to exceed the market value
of the repurchase agreement. The underlying collateral for all repurchase
agreements is held in a customer-only account of Northern, as custodian for
the Trust, at the Federal Reserve Bank of Chicago.
 Each Portfolio may enter into joint repurchase agreements with non-affiliated
counterparties through a master repurchase agreement with Northern. Northern
administers and manages these repurchase agreements in accordance with and as
part of its duties under its investment advisory agreements with the
Portfolios and does not collect any additional fees from the Portfolios. The
Diversified Assets and Government Portfolios had entered into such joint
repurchase agreements as of May 31, 1999, as reflected in the accompanying
Statements of Investments.

(c) Interest Income
Interest income is recorded on the accrual basis and includes amortization of
discounts and premiums.

(d) Federal Taxes
It is each Portfolio's policy to continue to comply with the requirements of
the Internal Revenue Code applicable to regulated investment companies and to
distribute each year substantially all of its taxable income and tax-exempt
income to its shareholders. Therefore, no provision is made for federal taxes.
 At November 30, 1998, the Trust's most recent tax year end, the Portfolios
had approximately the following amount of capital loss carryforwards for U.S.
federal income tax purposes:

<TABLE>
<CAPTION>
                        Amount     Year of Expiration
                    (in thousands)
- -----------------------------------------------------
<S>                 <C>            <C>
Diversified Assets       $939             2002
- -----------------------------------------------------
</TABLE>
 This amount is available to be carried forward to offset future capital gains
to the extent permitted by applicable laws or regulations.

(e) Expenses
Expenses arising in connection with a specific Portfolio are allocated to that
Portfolio. Certain expenses arising in connection with a class of shares are
allocated to that class of shares.
 Expenses incurred which do not specifically relate to an individual Portfolio
are allocated among the Portfolios based on each Portfolio's relative average
net assets for the year.

                                      22
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(f) Distributions
Each Portfolio's net investment income is declared daily as a dividend to
shareholders of record as of 3:00 p.m., Chicago time. Net realized short-term
capital gains, if any,
in excess of net capital loss carryforwards, are declared and distributed at
least annually.
 Distributions of net investment income with respect to a calendar month
(including with respect to shares redeemed at any time during the month) are
made as soon as practicable following the end of the month. Distributions are
made by each Portfolio to Northern in cash or automatically reinvested in
additional shares of the Portfolio. Northern has undertaken to credit or
arrange for the crediting of such distributions to each shareholder's account
with Northern, its affiliates or its correspondents.

3. Advisory, Transfer Agency, Custodian and Other Agreements
As compensation for the services rendered as investment adviser, including the
assumption by Northern of the expenses related thereto, Northern is entitled
to a fee, computed daily and payable monthly, at an annual rate of .25% of
each Portfolio's average daily net assets.
 Until further notice, Northern has voluntarily agreed to waive .15% of its
advisory fee for the Government Select Portfolio, reducing such fee to .10%
per annum. The effect of this waiver by Northern for the six months ended May
31, 1999 was to reduce advisory fees as shown on the accompanying Statements
of Operations.
 As compensation for the services rendered as custodian and transfer agent,
including the assumption by Northern of the expenses related thereto, Northern
receives compensation based on a pre-determined schedule of charges approved
by the Board.

4. Administration and Distribution Agreements
Northern and Investor Services Group, the co-administrators of the Portfolios
as of May 1, 1999, are entitled to a monthly co-administration fee at the
annual rate of 0.10% of each Portfolio's average daily net assets. The co-
administrators are also entitled to additional fees for special legal
services.
 During the five months ended April 30, 1999, the Trust had an administration
agreement with Goldman Sachs & Co., the Trust's prior Administrator, whereby
each Portfolio paid the administrator a fee at an annual rate of .10% of each
Portfolio's average daily net assets.
 In addition, if in any fiscal year the sum of a Portfolio's expenses,
including administration fees, but excluding the fees payable to Northern for
its duties as adviser and transfer agent for all shares, payments under the
service plan for the Portfolios' Premier Shares and Service Shares and certain
extraordinary expenses, exceeded on an annualized basis .10% of the
Portfolio's average daily net assets, the administrators reimbursed each
Portfolio for the amount of the excess pursuant to the terms of the
administration agreements.
 Expenses reimbursed during the six months ended May 31, 1999 are shown on the
accompanying Statements of Operations. No administration fees were waived
under these agreements during the six months ended May 31, 1999.
 Goldman Sachs received no compensation under the distribution agreement.
 FDDI, the distributor for the Portfolio as of May 1, 1999, receives no
compensation under the distribution agreement.

5. Service Plan
The Trust has adopted a Service Plan pursuant to which the Trust may enter
into agreements with Northern, its affiliates or other institutions
("Servicing Agents") under which they will render certain administrative
support services and in some cases personal and account maintenance services
for their customers or investors who beneficially own Service and Premier
Shares. As compensation under the Service Plan, the institution or other
financial intermediary receives a fee at an annual rate of up to .25% and .50%
of the average daily net asset value of the outstanding Service and Premier
Shares, respectively. Furthermore, the Service Plan also provides for the
payment of fees to Northern, Goldman Sachs or other institutions for
consulting services, technology and systems support services to the Service
and Premier Shares customers at an annual rate of up to .08% of the average
daily net asset value of such shares serviced.

6. Bank Loans
The Trust maintains a $100,000,000 revolving bank credit line and a
$15,000,000 conditional revolving credit line for liquidity and other
purposes. Borrowings under this arrangement bear interest at 1% above the
federal funds rate and are secured by pledged securities equal to or exceeding
120% of the outstanding balance.
 The Portfolios had no borrowings under this agreement during the six months
ended May 31, 1999.

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Investment Advisers:

The Northern Trust Company

Northern Trust Quantitative Advisors, Inc.
50 South LaSalle Street
Chicago, Illinois  60675

Transfer Agent and Custodian:

The Northern Trust Company


The Semi-annual Report is authorized for distribution to prospective investors
only when preceded or accompanied by a Prospectus which contains facts
concerning the objectives and policies, management expenses and other
information.












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