NORTHWESTERN MUTUAL SERIES FUND INC
N-30D, 1996-08-21
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<PAGE>   1

                                                      June 30, 1996




SEMI - ANNUAL REPORT



                                                      Northwestern

                                                      Mutual

                                                      Variable

                                                      Life

                                                      Account



NORTHWESTERN MUTUAL SERIES FUND, INC.











                                                      Northwestern
                                                      Mutual Life(R)
                                                      720 East Wisconsin Avenue
                                                      Milwaukee, Wisconsin 53202
<PAGE>   2

     NORTHWESTERN MUTUAL SERIES FUND, INC.

<TABLE>        
     <S>                                                                       <C>
     DIRECTORS

     James D. Ericson .  President and Chief Executive Officer, Northwestern Mutual Life,
     . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  Milwaukee
     Martin F. Stein . . . . . . . . . . . Chairman of the Board, EyeCare One Corporation,
     . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  Milwaukee
     John K. MacIver . . . . . . . . . Partner, Michael Best & Friedrich Attorneys at Law,
     . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  Milwaukee
     Stephen N. Graff  . . . . . . . . . . . . . . Retired Partner, Arthur Andersen LLP,
     . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  Milwaukee
     William J. Blake  . . . . . . . . . . . . . .  Chairman, Blake Financial Corporation,
     . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  Milwaukee

     OFFICERS

     James D. Ericson  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . President
     Mark G. Doll  . . . . . . . . . . . . . . . . . . . . . .  Vice President & Treasurer
     Merrill C. Lundberg . . . . . . . . . . . . . . . . . . . . . . . . . . . . Secretary
     Gary E. Long  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  Controller

</TABLE>

     This report is submitted for the general information of owners of 
     Northwestern Mutual Variable Life policies.  This report is not authorized
     for distribution to prospective purchasers of variable life policies unless
     it is accompanied by an effective prospectus.  Northwestern Mutual 
     Variable Life policies are sold through individuals who, in addition to 
     being licensed life insurance agents of Northwestern Mutual Life, are 
     registered representatives of Northwestern Mutual Investment Services, 
     Inc., a wholly-owned subsidiary of Northwestern Mutual Life and a 
     registered broker-dealer under the Securities Exchange Act of 1934 and a 
     member of the National Association of Securities Dealers, Inc.

     90-1899 (6-96)
     Northwestern
     Mutual Life
     PO Box 3095
     Milwaukee WI  53201-3095

     Forwarding and Address Correction Requested
<PAGE>   3
 
                             POLICYOWNER PRIVILEGES
 
                        FREE TRANSFERS AMONG PORTFOLIOS
 
A limited number of free transfers per year are available with your policy. Same
day transfers are permitted among our investment portfolios by FAX 414-299-4268.
The appropriate form (form number 18-1425) must be used. A blank form is
included at the end of this report. Additional forms are available from your
Northwestern Mutual Life Agent.
 
      NORTHWESTERN MUTUAL LIFE'S VARIABLE LIFE POLICIES ARE PARTICIPATING*
 
Policies are expected to pay dividends, based on the company's recent mortality
and expense experience.
 
SOME OF THE POPULAR ADDITIONAL BENEFITS WHICH MAY BE AVAILABLE TO POLICYOWNERS
INCLUDE THE FOLLOWING (SUBJECT TO UNDERWRITING AND PAYMENT OF APPROPRIATE
PREMIUM).
 
                       OPTIONAL WAIVER OF PREMIUM BENEFIT
 
The Waiver of Premium Benefit waives premiums during total disability. Available
at ages 0-59.
 
                       OPTIONAL ACCIDENTAL DEATH BENEFIT
 
The Accidental Death Benefit provides an additional death benefit when death
results from accidental bodily injury. Available at ages 0-65.
 
                      OPTIONAL ADDITIONAL PURCHASE BENEFIT
 
When the Additional Purchase Benefit is purchased, the company agrees to issue
additional policies on several specified purchase dates without requiring
evidence of insurability. Available at ages 0-38.
 
CONTACT YOUR NORTHWESTERN MUTUAL LIFE AGENT IF YOU WISH TO LEARN MORE ABOUT ANY
OF THE POLICYOWNER PRIVILEGES DESCRIBED ABOVE.
 
* Dividends are based on actual experiences and are not guaranteed.
<PAGE>   4
 
TO OUR POLICYOWNERS:
 
Though many forecasters had predicted a recession in the first half of 1996, the
economy proved to be much stronger than expected. New jobs were created at a
well above average pace, reflecting strength in the manufacturing and service
sectors of the economy. Consumers became more confident, which, in turn, led to
increased spending on housing, autos, and non-durable goods. Faster economic
growth raises the possibility of higher inflation. Up until now, there have been
few early signs of rising raw material prices, but there is a noticeable
tightening of the labor force.
 
The financial markets reacted quite differently to these economic developments.
Bond prices fell, resulting in higher interest rates as investors adjusted to
the prospect of faster economic growth. This heightened fears that the Federal
Reserve Board would eventually have to tighten monetary policy. The failure by
Congress to come to a meaningful resolution on a balanced budget was a further
disappointment for the bond market. The stock market, on the other hand, turned
in a solid performance during the first six months. Investors chose to overlook
rising interest rates and focused instead on the positives of stronger corporate
profits and low inflation. Inflows into equity mutual funds reached all-time
record highs during this period, and the market became increasingly speculative.
Approaching the middle of the year, however, the stock market began to lose
momentum when the sustainability of future earnings growth became more
questionable.
 
As we approach the second half of the year, the markets seem to be entering a
period of greater uncertainty, with broader swings on a day to day basis. In our
view, it is not unreasonable to expect a correction at some point. However, the
magnitude of such moves will depend on several important factors, including the
strength of the economy, the outlook for inflation, and the response from the
Federal Reserve Board. Perhaps most important will be the reaction of individual
investors, who determine the inflows into the stock market, primarily through
mutual funds. It is never easy to consistently predict changes in market
direction. The best approach is to stay focused on long-term investment goals,
regardless of market fluctuations.
 
IMPORTANT NOTE:
 
The average annual total returns shown with the graphs on the following pages
are not an estimate or a guarantee of future performance. These average annual
total returns reflect reinvestment of investment income and capital gain
distributions, and deduction of investment management fees and fund expenses,
but not product charges. See the prospectus for a description of the effect of
investment performance on policy benefits. Policy benefits reflect the
investment rates of return of the divisions in which the policy is invested, and
will vary depending on the insurance and administrative charges, applicable
sales charges, and the mortality and expense risk charge associated with the
product. These product charges effectively reduce the dollar amount of any net
gains and increase the dollar amount of any net losses. The net investment rates
of return shown on page 10 reflect the product charges borne by each division of
the Variable Life Account, but not the additional charges that are unique to
your policy. Your Northwestern Mutual Life agent/registered representative of
Northwestern Mutual Investment Service ("NMIS") can provide you with actual
rates of return for your variable life insurance policy, showing the effect of
all of the applicable charges.
 
                                        1
<PAGE>   5
AGGRESSIVE GROWTH STOCK PORTFOLIO

The chart below assumes an initial investment of $10,000 made on 11/30/90
(commencement of the Fund's operations). Returns shown include deductions for
management and other fund expenses, and reinvestment of all dividends. Returns
exclude deductions for separate account sales loads and account fees. Past
performance is not predictive of future performance. Investment return and
principal value will fluctuate, so that your shares, when redeemed, may be worth
more or less than their original cost. The net investment rates of return shown
on page 10 reflect mortality and expense risk charges deducted from the assets
of the separate account. The cost of insurance protection, which is not
reflected in the returns shown on this chart, would make the returns
significantly lower. Investors are urged to obtain a personalized illustration
of historical performance which reflects the cost of insurance protection.

Average Annual Total Return
For Periods Ended June 30,1996

<TABLE>
<CAPTION>
                                         One            Five          Since
                                         Year           Year        Inception *
                                         ----           ----        -----------
<S>                                     <C>            <C>         <C>               <C>
Aggressive Growth Stock Portfolio        43.17%         22.69%      25.17%
Wilshire Small Cap                       25.55%         17.00%      20.96%
Wilshire Next 1750                       25.13%         17.88%      21.77%


*November 30, 1990 inception.


                                         11/90          6/91        6/92              6/93
Aggressive Growth Stock Portfolio       $10,000        $12,593     $13,994           $17,133
Wilshire Small Cap                      $10,000        $13,189     $15,522           $19,336
Wilshire Next 1750                      $10,000        $13,186     $15,086           $19,108


                                         6/94           6/95        6/96
Aggressive Growth Stock Portfolio       $19,354        $24,448     $35,003
Wilshire Small Cap                      $20,012        $23,034     $28,918
Wilshire Next 1750                      $19,670        $23,986     $30,014
</TABLE>
                                       2
<PAGE>   6
INTERNATIONAL EQUITY STOCK PORTFOLIO
 
The chart below assumes an initial investment of $10,000 made on 4/30/93
(commencement of the Fund's operations). Returns shown include deductions for
management and other fund expenses, and reinvestment of all dividends. Returns
exclude deductions for separate account sales loads and account fees. Past
performance is not predictive of future performance. Investment return and
principal value will fluctuate, so that your shares, when redeemed, may be worth
more or less than their original cost. The net investment rates of return shown
on page 10 reflect mortality and expense risk charges deducted from the assets
of the separate account. The cost of insurance protection, which is not
reflected in the returns shown on this chart, would make the returns
significantly lower. Investors are urged to obtain a personalized illustration
of historical performance which reflects the cost of insurance protection.
 
Average Annual Total Return
For Periods Ended June 30, 1996

<TABLE>
<CAPTION>

                                              One       Since
                                              Year    Inception*
                                             ------   ----------
<S>                                          <C>       <C>          <C>         <C>        <C>
International Equity Stock Portfolio         15.44%     15.00%    
EAFE                                         13.60%     10.78%
                                            
*April 30, 1993 inception.                
                                          
                                          
                                               4/93       6/93        6/94       6/95       6/96   
International Equity Stock Portfolio         $10,000    $10,118     $12,155    $13,487    $15,569
EAFE                                         $10,000    $10,202     $11,936    $12,175    $13,831

</TABLE>

                                     

                                        3
<PAGE>   7
INDEX 500 STOCK PORTFOLIO
 
The chart below assumes an initial investment of $10,000 made on 6/30/86. 
Returns shown include deductions for management and other fund expenses, and
reinvestment of all dividends. Returns exclude deductions for separate account
sales loads and account fees. Past performance is not predictive of future
performance. Investment return and principal value will fluctuate, so that your
shares, when redeemed, may be worth more or less than their original cost. The
net investment rates of return shown on page 10 reflect mortality and expense
risk charges deducted from the assets of the separate account. The cost of
insurance protection, which is not reflected in the returns shown on this chart,
would make the return significantly lower. Investors are urged to obtain a
personalized illustration of historical performance which reflects the cost of
insurance protection.

Average Annual Total Return
For Periods Ended June 30, 1996

<TABLE>
<CAPTION>


                                                One       Five       Ten
                                                Year      Years     Years
                                                ----      -----     -----
<S>                                          <C>        <C>      <C>        <C>     <C>         <C>           
Index 500 Stock Portfolio                       25.89%    14.55%    11.68%
S&P 500 Index                                   25.90%    15.65%    13.62%


                                                6/86      6/87      6/88      6/89      6/90
Index 500 Stock Portfolio                     $ 10,000  $ 12,313  $ 11,888  $ 13,021  $ 13,972
S&P 500 Index                                 $ 10,000  $ 12,450  $ 11,566  $ 13,902  $ 16,155


                                                6/91      6/92      6/93      6/94      6/95       6/96      
Index 500 Stock Portfolio                     $ 15,299  $ 16,768  $ 18,850  $ 19,035  $ 23,967   $ 30,172
S&P 500 Index                                 $ 17,334  $ 19,657  $ 22,330  $ 22,620  $ 28,479   $ 35,855

</TABLE>
                      




 
                                        4
<PAGE>   8
 
GROWTH STOCK PORTFOLIO
 
The chart below assumes an initial investment of $10,000 made on 5/3/94 
(commencement of operations). Returns shown include deductions for management   
and other fund expenses, and reinvestment of all dividends. Returns exclude
deductions for separate account sales loads and account fees. Past performance
is not predictive of future performance. Investment return and principal value
will fluctuate, so that your shares, when redeemed, may be worth more or less
than their original cost. The net investment rates of return shown on page 10
reflect mortality and expense risk charges deducted from the assets of the
separate account. The cost of insurance protection, which is not reflected in
the returns shown on this chart, would make the returns significantly lower.
Investors are urged to obtain a personalized illustration of historical
performance which reflects the cost of insurance protection.

Average Annual Total Return
For Periods Ended June 30, 1996

<TABLE>
<CAPTION>

                                            One          Since
                                            Year       Inception*
                                            ----       ----------
<S>                                      <C>            <C>          <C>        <C>          
Growth Stock Portfolio                      26.39%         19.51%
S&P 500 Index                               25.90%         22.89%

*May 3, 1994 inception.

                                            5/3/94         6/94         6/95       6/96
Growth Stock Portfolio                    $ 10,000       $ 9,884      $ 11,626   $ 14,694
S&P 500 Index                             $ 10,000       $ 9,845      $ 12,394   $ 15,604

</TABLE>

                                                   
  








 
                                        5
<PAGE>   9
 
GROWTH AND INCOME STOCK PORTFOLIO
 
The chart below assumes an initial investment of $10,000 made on 5/3/94 
(commencement of operations). Returns shown include deductions for management   
and other fund expenses, and reinvestment of all dividends. Returns exclude
deductions for separate account sales loads and account fees. Past performance
is not predictive of future performance. Investment return and principal value
will fluctuate, so that your shares, when redeemed, may be worth more or less
than their original cost. The net investment rates of return shown on page 10
reflect mortality and expense risk charges deducted from the assets of the
separate account. The cost of insurance protection, which is not reflected in
the returns shown on this chart, would make the returns significantly lower.
Investors are urged to obtain a personalized illustration of historical
performance which reflects the cost of insurance protection.
 
Average Annual Total Return
For Periods Ended June 30, 1996

<TABLE>
<CAPTION>

                                                One             Since
                                                Year         Inception*
                                                ----         ----------
<S>                                          <C>             <C>         <C>         <C>                
Growth and Income Stock Portfolio               19.95%          17.25%
S&P 500 Index                                   25.90%          22.89%

*May 3, 1994 inception.

                                                5/3/94          6/94       6/95        6/96
Growth and Income Stock Portfolio             $ 10,000        $ 9,784    $ 11,754    $ 14,099
S&P 500 Index                                 $ 10,000        $ 9,845    $ 12,394    $ 15,604

</TABLE>
  














                                        6
<PAGE>   10
SELECT BOND PORTFOLIO
 
The chart below assumes an initial investment of $10,000 made on 6/30/86.
Returns shown include deductions for management and other fund expenses, and
reinvestment of all dividends. Returns exclude deductions for separate account
sales loads and account fees. Past performance is not predictive of future
performance. Investment return and principal value will fluctuate, so that your
shares, when redeemed, may be worth more or less than their original cost. The
net investment rates of return shown on page 10 reflect mortality and expense
risk charges deducted from the assets of the separate account. The cost of
insurance protection, which is not reflected in the returns shown on this chart,
would make the returns significantly lower. Investors are urged to obtain a
personalized illustration of historical performance which reflects the cost of
insurance protection.
 
Average Annual Total Return
For Periods Ended June 30, 1996

<TABLE>
<CAPTION>

                                           One           Five          Ten
                                           Year          Years        Years
                                           ----          -----        -----
<S>                                      <C>           <C>          <C>           <C>          <C>         <C>
Select Bond Portfolio                      5.00%         8.93%        8.49%
Merrill Lynch Domestic Master Index        4.96%         8.36%        8.55%


                                          6/86          6/87         6/88           6/89         6/90
Select Bond Portfolio                    $10,000       $10,398      $11,108        $12,498      $13,296
Merrill Lynch Domestic Master Index      $10,000       $10,538      $11,363        $12,776      $13,712


                                          6/91          6/92         6/93           6/94         6/95         6/96
Select Bond Portfolio                    $14,735       $16,959      $19,127        $19,082      $21,520      $22,596
Merrill Lynch Domestic Master Index      $15,204       $17,355      $19,426        $19,224      $21,644      $22,717
</TABLE>
<PAGE>   11
HIGH YIELD BOND PORTFOLIO
 
The chart below assumes an initial investment of $10,000 made on 5/3/94
(commencement of operations). Returns shown include deductions for management
and other fund expenses, and reinvestment of all dividends. Returns exclude
deductions for separate account sales loads and account fees. Past performance
is not predictive of future performance. Investment return and principal value
will fluctuate, so that your shares, when redeemed, may be worth more or less
than their original cost. The net investment rates of return shown on page 10
reflect mortality and expense risk charges deducted from the assets of the
separate account. The cost of insurance protection, which is not reflected in
the returns shown on this chart, would make the returns significantly lower.
Investors are urged to obtain a personalized illustration of historical
performance which reflects the cost of insurance protection.
 
Average Annual Total Return
For Periods Ended June 30, 1996

<TABLE>
<CAPTION>

                                        One        Since
                                        Year     Inception
                                        ----     ---------
<S>                                     <C>       <C>
High Yield Bond Portfolio               11.71%    12.26%
Salomon Brothers High Yield
  Market Index                           9.59%    11.05%
Lehman Brothers High Yield
  Intermediate Market Index             10.02%    10.75%

*May 3, 1994 inception.

<CAPTION>

                                        5/3/94    6/94    6/95      6/95
<S>                                   <C>       <C>      <C>       <C>
High Yield Bond Portfolio              $10,000  $10,110   $11,490   $12,836
Salomon Brothers High Yield
 Market Index                          $10,000  $10,046   $11,442   $12,539
Lehman Brothers High Yield
 Intermediate Market Index             $10,000  $10,061   $11,330   $12,465


</TABLE>
        
<PAGE>   12
BALANCED PORTFOLIO
 
The chart below assumes an initial investment of $10,000 made on 6/30/86.
Returns shown include deductions for management and other fund expenses, and
reinvestment of all dividends. Returns exclude deductions for separate account
sales loads and account fees. Past performance is not predictive of future
performance. Investment return and principal value will fluctuate, so that your
shares, when redeemed, may be worth more or less than their original cost. The
net investment rates of return shown on page 10 reflect mortality and expense
risk charges deducted from the assets of the separate account. The cost of
insurance protection, which is not reflected in the returns shown on this chart,
would make the returns significantly lower. Investors are urged to obtain a
personalized illustration of historical performance which reflects the cost of
insurance protection.

Average Annual Total Return
For Periods Ended June 30, 1996

<TABLE>
<CAPTION>

                                         One             Five          Ten
                                         Year            Years         Years
                                         ----            -----         -----
<S>                                     <C>            <C>           <C>            <C>          <C>            <C>
Balanced Portfolio                       15.91%          11.54%        10.15%
S&P 500 Index                            25.90%          15.65%        13.62%
Merrill Lynch Domestic Master Index       4.96%           8.36%         8.55%
Merrill Lynch 91-Day Treasury Bill        5.53%           4.59%         5.98%


                                         6/86           6/87          6/88            6/89        6/90
Balanced Portfolio                      $10,000        $11,619       $11,821         $12,920     $13,825
S&P 500 Index                           $10,000        $12,450       $11,566         $13,902     $16,155
Merrill Lynch Domestic Master Index     $10,000        $10,538       $11,363         $12,776     $13,712
Merrill Lynch 91-Day Treasury Bill      $10,000        $10,616       $11,288         $12,244     $13,284


                                         6/91           6/92          6/93            6/94        6/95            6/96 
Balanced Portfolio                      $15,224        $16,946       $19,027         $19,189     $22,675         $26,282
S&P 500 Index                           $17,334        $19,657       $22,330         $22,620     $28,479         $35,855
Merrill Lynch Domestic Master Index     $15,204        $17,355       $19,426         $19,224     $21,644         $22,717
Merrill Lynch 91-Day Treasury Bill      $14,288        $15,028       $15,535         $16,059     $16,944         $17,881
</TABLE>
           

<PAGE>   13
 
                             VARIABLE LIFE ACCOUNT
 
The annual report of Northwestern Mutual Series Fund Inc., is included because
all payments to the Variable Life Account are invested in one or more Portfolios
of this Fund. The Series Fund is a mutual fund currently offering shares only to
The Northwestern Mutual Life Insurance Company and its separate investment
accounts.
                                      THE NORTHWESTERN MUTUAL LIFE INSURANCE
                                      COMPANY
 
                                      JAMES D. ERICSON
 
                                      James D. Ericson, President and C.E.O.
 
The following table shows the net investment rates of return for each of the
divisions of the Variable Life Account.
 
POLICIES ISSUED BEFORE OCTOBER 11, 1995:
 
<TABLE>
<CAPTION>
                                   FOR THE
                                  SIX MONTHS
                                    ENDED
                                   JUNE 30                       FOR THE YEARS ENDED DECEMBER 31
                                  ----------    ------------------------------------------------------------------
           DIVISION                  1996       1995     1994     1993     1992    1991     1990     1989     1988
- -------------------------------   ----------    -----    -----    -----    ----    -----    -----    -----    ----
<S>                               <C>           <C>      <C>      <C>      <C>     <C>      <C>      <C>      <C>
Index 500 Stock*...............       9.64%     36.30%    0.51%    9.13%   3.81%   28.88%   -4.99%   17.47%   8.07%
Growth Stock...................      10.22      29.91     1.08**    N/A     N/A      N/A      N/A      N/A     N/A
Growth and Income Stock........       6.79      30.21    -0.13**    N/A     N/A      N/A      N/A      N/A     N/A
Aggressive Growth Stock........      18.45      38.32     3.98**    N/A     N/A      N/A      N/A      N/A     N/A
International Equity...........       8.75      13.78    -0.36**    N/A     N/A      N/A      N/A      N/A     N/A
Select Bond....................      -1.76      18.27    -2.96    10.04    6.99    16.51     7.34    13.27    7.47
High Yield Bond................       6.32      15.96     2.54**    N/A     N/A      N/A      N/A      N/A     N/A
Money Market...................       2.21       5.09     3.33     2.19    2.77     5.13     7.49     8.45    6.74
Balanced.......................       4.70      25.51    -0.54     9.14    4.87    22.47     0.81    14.76    7.33
</TABLE>
 
POLICIES ISSUED ON OR AFTER OCTOBER 11, 1995:
 
<TABLE>
<CAPTION>
                                        FOR THE        FOR THE
                                       SIX MONTHS      PERIOD
                                         ENDED          ENDED
                                        JUNE 30      DECEMBER 31
                                       ----------    -----------
              DIVISION                    1996          1995+
- ------------------------------------   ----------    -----------
<S>                                    <C>           <C>
Index 500 Stock.....................       9.70%         6.61%
Growth Stock........................      10.28          6.34
Growth and Income Stock.............       6.85          6.29
Aggressive Growth Stock.............      18.51          9.83
International Equity................       8.81          2.83
Select Bond.........................      -1.71          3.66
High Yield Bond.....................       6.38          0.89
Money Market........................       2.26          1.10
Balanced............................       4.75          4.97
</TABLE>
 
 + Reflects actual return from October 11, 1995 (Inception Date) through
   December 31, 1995.
 
 * As of April 30, 1993 the portfolio was indexed to the S&P 500 Stock Index;
   prior to that date the portfolio was actively managed.
 
** Growth Stock, Growth and Income Stock, Aggressive Growth Stock, International
   Equity, and High Yield Bond Divisions began operations on May 3, 1994. The
   investment rates of return reflect performance from May 3, 1994.
 
The net investment rates of return shown above should not be considered a
representation of investment results which may be anticipated in the future. The
net investment rates of return include investment income and capital gains. See
the prospectus for a description of the effect of investment performance on
policy benefits. Policy benefits reflect the investment rates of return of the
divisions in which the policy is invested, and will vary depending on the fees
and expenses associated with the policy. Policy fees and expenses will vary with
each individual investor. All common fees of the divisions of the Variable Life
Account are reflected in the net investment rates of return shown above.
 
AN INVESTMENT IN THE MONEY MARKET PORTFOLIO IS NEITHER INSURED NOR GUARANTEED BY
THE U.S. GOVERNMENT AND THERE CAN BE NO ASSURANCE THAT THE PORTFOLIO WILL BE
ABLE TO MAINTAIN A STABLE NET ASSET VALUE OF $1.00 PER SHARE.
 
Note: "Standard and Poor's 500" and "S&P 500(R)" are trademarks of McGraw-Hill,
      Inc. and have been licensed for use by The Northwestern Mutual Life
      Insurance Company. The Series Funds and its Portfolios are not sponsored,
      endorsed, sold or promoted by Standard & Poor's, and Standard & Poor's
      makes no representation regarding the advisability of investing in them.
 

                                       10
<PAGE>   14
 
                   NORTHWESTERN MUTUAL VARIABLE LIFE ACCOUNT
                      STATEMENT OF ASSETS AND LIABILITIES
                                 JUNE 30, 1996
                                 (IN THOUSANDS)
 
<TABLE>
<S>                                                                                            <C>       <C>
ASSETS
  Investments at Market Value:
    Northwestern Mutual Series Fund, Inc.
      Index 500 Stock
         24,569 shares (cost $35,218)........................................................  $45,256
      Growth Stock
         6,632 shares (cost $7,682)..........................................................    9,212
      Growth and Income Stock
         9,290 shares (cost $10,446).........................................................   11,818
      Aggressive Growth Stock
         9,373 shares (cost $22,720).........................................................   29,767
      International Equity
         14,496 shares (cost $18,716)........................................................   20,366
      Select Bond
         4,593 shares (cost $5,321)..........................................................    5,365
      High Yield Bond
         2,349 shares (cost $2,448)..........................................................    2,556
      Money Market
         9,837 shares (cost $9,837)..........................................................    9,837
      Balanced
         58,350 shares (cost $79,177)........................................................   92,835   $227,012
                                                                                               -------
  Due from Sale of Fund Shares........................................................................         25
  Due from Northwestern Mutual Life Insurance Company.................................................        210
                                                                                                         --------
           Total Assets...............................................................................   $227,247
                                                                                                         ========
LIABILITIES
  Due to Northwestern Mutual Life Insurance Company...................................................   $     25
  Due on Purchase of Fund Shares......................................................................        210
                                                                                                         --------
           Total Liabilities..........................................................................        235
                                                                                                         --------
EQUITY (Note 8)
  Policies Issued Before October 11, 1995.............................................................    208,941
  Policies Issued On or After October 11, 1995........................................................     18,071
                                                                                                         --------
           Total Equity...............................................................................    227,012
                                                                                                         --------
    Total Liabilities and Equity......................................................................   $227,247
                                                                                                         ========
</TABLE>
 
    The Accompanying Notes are an Integral Part of the Financial Statements
                       (Prepared from Unaudited Figures)
 
                                       11
<PAGE>   15
 
                 NORTHWESTERN MUTUAL LIFE VARIABLE LIFE ACCOUNT
                 STATEMENT OF OPERATIONS AND CHANGES IN EQUITY
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                 INDEX 500
                                                    COMBINED                   STOCK DIVISION            GROWTH STOCK DIVISION
                                           --------------------------    --------------------------    --------------------------
                                           SIX MONTHS                    SIX MONTHS                    SIX MONTHS
                                             ENDED        YEAR ENDED       ENDED        YEAR ENDED       ENDED        YEAR ENDED
                                            JUNE 30,     DECEMBER 31,     JUNE 30,     DECEMBER 31,     JUNE 30,     DECEMBER 31,
                                           ----------    ------------    ----------    ------------    ----------    ------------
                                              1996           1995           1996           1995           1996           1995
                                           ----------    ------------    ----------    ------------    ----------    ------------
<S>                                        <C>           <C>             <C>           <C>             <C>           <C>
INVESTMENT INCOME
  Dividend Income.......................    $  8,630       $  4,153       $  1,153       $    282        $   46         $  188
  Mortality and Expense Risks...........         492            736             98            141            18             21
  Taxes.................................         204            314             41             60             7              9
                                            --------       --------        -------        -------        ------         ------
  Net Investment Income (Loss)..........       7,934          3,103          1,014             81            21            158
                                            --------       --------        -------        -------        ------         ------
REALIZED AND UNREALIZED GAIN (LOSS) ON
  INVESTMENTS
  Realized Gain on Investments..........       1,075          1,300            155            339            49             16
  Unrealized Appreciation (Depreciation)
    of
    Investments During the Period.......       5,702         30,929          2,543          8,323           648            906
                                            --------       --------        -------        -------        ------         ------
  Net Gain (Loss) on Investments........       6,777         32,229          2,698          8,662           697            922
                                            --------       --------        -------        -------        ------         ------
  Increase (Decrease) in Equity Derived
    from
    Investment Activity.................      14,711         35,332          3,712          8,743           718          1,080
                                            --------       --------        -------        -------        ------         ------
EQUITY TRANSACTIONS
  Policyowners' Net Payments............      42,084         51,813          5,840         11,096         1,281          2,327
  Policy Loans, Surrenders, and Death
    Benefits............................      (7,797)       (10,909)        (1,733)        (2,239)         (173)          (251)
  Mortality and Other (net).............      (6,875)        (9,537)        (1,110)        (2,021)         (293)          (427)
  Transfers from Other Divisions........      17,428         12,075          2,930          1,623         1,792          1,048
  Transfers to Other Divisions..........     (17,428)       (12,075)          (867)        (2,683)         (174)          (186)
                                            --------       --------        -------        -------        ------         ------
Increase in Equity Derived from
  Equity Transactions...................      27,412         31,367          5,060          5,776         2,433          2,511
                                            --------       --------        -------        -------        ------         ------
Net Increase in Equity..................      42,123         66,699          8,772         14,519         3,151          3,591
Equity
  Beginning of Period...................     184,889        118,190         36,486         21,967         6,061          2,470
                                            --------       --------        -------        -------        ------         ------
  End of Period.........................    $227,012       $184,889       $ 45,258       $ 36,486        $9,212         $6,061
                                            ========       ========        =======        =======        ======         ======
</TABLE>
 
    The Accompanying Notes are an Integral Part of the Financial Statements
                       (Prepared from Unaudited Figures)
 
                                       12
<PAGE>   16
 
                   NORTHWESTERN MUTUAL VARIABLE LIFE ACCOUNT
                 STATEMENT OF OPERATIONS AND CHANGES IN EQUITY
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
          GROWTH & INCOME                AGGRESSIVE GROWTH             INTERNATIONAL EQUITY
          STOCK DIVISION                  STOCK DIVISION                     DIVISION                  SELECT BOND DIVISION
    ---------------------------     ---------------------------     ---------------------------     ---------------------------
    SIX MONTHS                      SIX MONTHS                      SIX MONTHS                      SIX MONTHS
      ENDED         YEAR ENDED        ENDED         YEAR ENDED        ENDED         YEAR ENDED        ENDED         YEAR ENDED
     JUNE 30,      DECEMBER 31,      JUNE 30,      DECEMBER 31,      JUNE 30,      DECEMBER 31,      JUNE 30,      DECEMBER 31,
    ----------     ------------     ----------     ------------     ----------     ------------     ----------     ------------
       1996            1995            1996            1995            1996            1995            1996            1995
    ----------     ------------     ----------     ------------     ----------     ------------     ----------     ------------
<S> <C>            <C>              <C>            <C>              <C>            <C>              <C>            <C>
     $    212         $  496         $    892        $     54        $    924        $     67         $  176          $  110
           24             30               56              57              42              52             12              20
           10             13               23              24              17              22              5               9
      -------         ------          -------         -------         -------         -------         ------          ------
          178            453              813             (27)            865              (7)           159              81
      -------         ------          -------         -------         -------         -------         ------          ------
           46             25              102              58              17               2              4              13
          404          1,057            2,948           3,798             529           1,389           (246)            596
      -------         ------          -------         -------         -------         -------         ------          ------
          450          1,082            3,050           3,856             546           1,391           (242)            609
      -------         ------          -------         -------         -------         -------         ------          ------
          628          1,535            3,863           3,829           1,411           1,384            (83)            690
      -------         ------          -------         -------         -------         -------         ------          ------
        1,908          3,211            4,335           6,744           3,493           6,472            666           1,230
         (272)          (388)            (897)           (830)           (653)           (634)           (45)           (311)
         (385)          (611)            (823)         (1,184)           (703)         (1,156)          (112)           (234)
        1,782          1,329            5,885           3,476           2,692           2,112            452             335
         (311)          (312)            (481)           (368)           (366)           (750)          (269)           (513)
      -------         ------          -------         -------         -------         -------         ------          ------
        2,722          3,229            8,019           7,838           4,463           6,044            692             507
      -------         ------          -------         -------         -------         -------         ------          ------
        3,350          4,764           11,882          11,667           5,874           7,428            609           1,197
        8,467          3,703           17,885           6,218          14,493           7,065          4,756           3,559
      -------         ------          -------         -------         -------         -------         ------          ------
     $ 11,817         $8,467         $ 29,767        $ 17,885        $ 20,367        $ 14,493         $5,365          $4,756
      =======         ======          =======         =======         =======         =======         ======          ======
</TABLE>
 
    The Accompanying Notes are an Integral Part of the Financial Statements
                       (Prepared from Unaudited Figures)
 
                                       13
<PAGE>   17
 
                 NORTHWESTERN MUTUAL LIFE VARIABLE LIFE ACCOUNT
           STATEMENT OF OPERATIONS AND CHANGES IN EQUITY (CONTINUED)
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                HIGH YIELD BOND DIVISION      MONEY MARKET DIVISION         BALANCED DIVISION
                                                -------------------------   -------------------------   -------------------------
                                                SIX MONTHS                  SIX MONTHS                  SIX MONTHS
                                                  ENDED       YEAR ENDED      ENDED       YEAR ENDED      ENDED       YEAR ENDED
                                                 JUNE 30,    DECEMBER 31,    JUNE 30,    DECEMBER 31,    JUNE 30,    DECEMBER 31,
                                                ----------   ------------   ----------   ------------   ----------   ------------
                                                   1996          1995          1996          1995          1996          1995
                                                ----------   ------------   ----------   ------------   ----------   ------------
<S>                                             <C>          <C>            <C>          <C>            <C>          <C>
INVESTMENT INCOME
  Dividend Income.............................    $   14        $  183       $    203      $    252      $  5,010      $  2,521
  Mortality and Expense Risks.................         6             8             19            22           217           385
  Taxes.......................................         2             3              6             9            93           165
                                                  ------        ------       --------       -------       -------       -------
  Net Investment Income.......................         6           172            178           221         4,700         1,971
                                                  ------        ------       --------       -------       -------       -------
REALIZED AND UNREALIZED GAIN (LOSS) ON
  INVESTMENTS
  Realized Gain on Investments................        10             8         --            --               692           839
  Unrealized Appreciation (Depreciation) of
    Investments During the Period.............       119            29         --            --            (1,243)       14,831
                                                  ------        ------       --------       -------       -------       -------
  Net Gain (Loss) on Investments..............       129            37              0             0          (551)       15,670
                                                  ------        ------       --------       -------       -------       -------
  Increase in Equity Derived from
    Investment Activity.......................       135           209            178           221         4,149        17,641
                                                  ------        ------       --------       -------       -------       -------
EQUITY TRANSACTIONS
  Policyowners' Net Payments..................       451           761         16,363         4,335         7,747        15,637
  Policy Loans, Surrenders, and Death
    Benefits..................................      (133)         (113)          (240)         (285)       (3,651)       (5,858)
  Mortality and Other (net)...................       (90)         (149)        (1,817)         (645)       (1,542)       (3,110)
  Transfers from Other Divisions..............       376           687            631         1,210           888           255
  Transfers to Other Divisions................      (330)         (181)       (12,197)       (1,738)       (2,433)       (5,344)
                                                  ------        ------       --------       -------       -------       -------
Increase in Equity Derived from
  Equity Transactions.........................       274         1,005          2,740         2,877         1,009         1,580
                                                  ------        ------       --------       -------       -------       -------
Net Increase in Equity........................       409         1,214          2,918         3,098         5,158        19,221
Equity
  Beginning of Period.........................     2,147           933          6,919         3,821        87,675        68,454
                                                  ------        ------       --------       -------       -------       -------
  End of Period...............................    $2,556        $2,147       $  9,837      $  6,919      $ 92,833      $ 87,675
                                                  ======        ======       ========       =======       =======       =======
</TABLE>
 
    The Accompanying Notes are an Integral Part of the Financial Statements
                       (Prepared from Unaudited Figures)
 
                                       14
<PAGE>   18
 
                   NORTHWESTERN MUTUAL VARIABLE LIFE ACCOUNT
                         NOTES TO FINANCIAL STATEMENTS
                                 JUNE 30, 1996
 
Note 1 -- Northwestern Mutual Variable Life Account (the "Account") is
registered as a unit investment trust under the Investment Company Act of 1940
and is a segregated asset account of The Northwestern Mutual Life Insurance
Company ("Northwestern Mutual Life") used to fund variable life insurance
policies.
 
Note 2 -- The preparation of the financial statements in conformity with
generally accepted accounting principles requires management to make estimates
and assumptions that affect the reported amounts of assets and liabilities and
disclosure of contingent 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. Principal
accounting policies are summarized below.
 
Note 3 -- All assets of each Division of the Account are invested in shares of
the corresponding Portfolio of Northwestern Mutual Series Fund, Inc. (the
"Fund"). The shares are valued at the Fund's offering and redemption price per
share. The Northwestern Mutual Series Fund, Inc. is a diversified open-end
investment company registered under the Investment Company Act of 1940.
 
Note 4 -- Dividend income from the Fund is recorded on the record date of the
dividends. Transactions in Fund shares are accounted for on the trade date. The
basis for determining cost on sale of Fund shares is identified cost. Purchases
and sales of Fund shares for the six months ended June 30, 1996 by each Division
are shown below:
 
<TABLE>
<CAPTION>
                            PURCHASES     SALES
                            ----------  ----------
<S>                         <C>         <C>
Index 500 Stock Division... $6,567,972  $  495,299
Growth Stock Division......  2,635,513     181,455
Growth and Income Stock
  Division.................  3,115,698     215,618
Aggressive Growth
  Division.................  9,096,795     264,736
International Equity
  Division.................  5,456,013     128,100
Select Bond Division.......  1,066,719     215,533
High Yield Bond Division...    622,184     342,453
Money Market Division......  7,473,484   4,554,988
Balanced Division..........  8,502,762   2,792,488
</TABLE>
 
Note 5 -- A deduction for mortality and expense risks is determined daily and
paid to Northwestern Mutual Life. Generally, for policies issued before October
11, 1995, and policies issued on or after October 11, 1995 the deduction is at
an annual rate of .50% and .60%, respectively, of the net assets of the Account.
The mortality risk is that insureds may not live as long as estimated. The
expense risk is that expenses of issuing and administering the policies may
exceed the estimated costs.
 
Certain deductions are also made from the annual or single premiums before
amounts are allocated to the Account. These deductions are for (1) sales load,
(2) administrative expenses, (3) taxes and (4) a risk charge for the guaranteed
minimum death benefit.
 
Additional mortality costs are deducted from the policy annually and are paid to
Northwestern Mutual Life to cover the cost of providing insurance protection.
This cost is actuarially calculated based upon the insured's age, the 1980
Commissioners Standard Ordinary Mortality Table and the amount of insurance
provided under the policy.
 
Note 6 -- Northwestern Mutual Life is taxed as a "life insurance company" under
the Internal Revenue Code. The variable life insurance policies which are funded
in the Account are taxed as part of the operations of Northwestern Mutual Life.
Policies provide that a charge for taxes may be made against the assets of the
Account. Generally, for policies issued before October 11, 1995, Northwestern
Mutual Life charges the Account at an annual rate of .20% of the Account's net
assets and reserves the right to increase, decrease or eliminate the charge for
taxes in the future. Generally, for policies issued on or after October 11,
1995, there is no charge being made against the assets of the Account for
federal income taxes, but Northwestern Mutual Life reserves the right to charge
for taxes in the future.
 
Note 7 -- The Account is credited for the policyowners' net annual premiums at
the respective policy anniversary dates regardless of when policyowners actually
pay their premiums. Northwestern Mutual Life's equity represents any unpaid
portion of net annual premiums.
 
                                       15
<PAGE>   19
 
                   NORTHWESTERN MUTUAL VARIABLE LIFE ACCOUNT
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                                 JUNE 30, 1996
                                 (IN THOUSANDS)
 
Note 8 -- Equity Values by Division are shown below:
 
<TABLE>
<CAPTION>
                                                                        POLICIES ISSUED
                                                                    BEFORE OCTOBER 11, 1995
                                                                          EQUITY OF:
                                                                   -------------------------       TOTAL
                                                                   POLICYOWNERS        NML         EQUITY
                                                                   ------------      -------      --------
<S>                                                                  <C>            <C>          <C>
Index 500 Stock Division........................................     $ 37,620        $ 5,127      $ 42,747
Growth Stock Division...........................................        6,793          1,223         8,016
Growth and Income Stock Division................................        8,820          1,675        10,495
Aggressive Growth Stock Division................................       21,643          3,635        25,278
International Equity Division...................................       15,501          3,137        18,638
Select Bond Division............................................        4,554            553         5,107
High Yield Bond Division........................................        1,904            371         2,275
Money Market Division...........................................        4,094            290         4,384
Balanced Division...............................................       85,670          6,331        92,001
                                                                     --------        -------      --------
                                                                     $186,599        $22,342      $208,941
                                                                     ========        =======      ========
</TABLE>
 
<TABLE>
<CAPTION>
                                                                        POLICIES ISSUED
                                                                    ON OR AFTER OCTOBER 11,
                                                                             1995
                                                                          EQUITY OF:
                                                                   -------------------------       TOTAL
                                                                   POLICYOWNERS        NML         EQUITY
                                                                   ------------      -------      --------
<S>                                                                 <C>             <C>          <C>
Index 500 Stock Division........................................     $    860        $ 1,649      $  2,509
Growth Stock Division...........................................          407            789         1,196
Growth and Income Stock Division................................          503            820         1,323
Aggressive Growth Stock Division................................        1,848          2,642         4,490
International Equity Division...................................          608          1,120         1,728
Select Bond Division............................................          114            144           258
High Yield Bond Division........................................          112            169           281
Money Market Division...........................................          893          4,560         5,453
Balanced Division...............................................          375            458           833
                                                                     --------        -------      --------
                                                                     $  5,720        $12,351      $ 18,071
                                                                     ========        =======      ========
</TABLE>
 
    The Accompanying Notes are an Integral Part of the Financial Statements
                       (Prepared from Unaudited Figures)
 
                                       16
<PAGE>   20
 
                            FINANCIAL STATEMENTS OF
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                           INDEX 500 STOCK PORTFOLIO
                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
 
STATEMENT OF ASSETS AND LIABILITIES
JUNE 30, 1996
 
<TABLE>
<S>                                     <C>
ASSETS
  Common Stocks
     (cost $403,717)..................  $565,267
  Money Market Investments
     (cost $44,662)...................    44,660
  Preferred Stocks
     (cost $1)........................         4
                                        --------
                                         609,931
  Cash................................       627
  Dividends and Interest Receivable...       733
  Futures Variation Margin............       228
  Due from Sale of Fund Shares........       143
                                        --------
       Total Assets...................   611,662
                                        --------
LIABILITIES
  Due on Redemption of Fund Shares....       518
  Due to Investment Advisor...........        93
  Accrued Expenses....................        19
                                        --------
       Total Liabilities..............       630
                                        --------
NET ASSETS............................  $611,032
                                        ========
REPRESENTED BY:
  Aggregate Paid in Capital
     (500,000 shares authorized,
     $.01 par value; 331,716
     shares outstanding)..............  $434,696
  Undistributed Net Investment
     Income...........................     6,331
  Undistributed Accumulated Net
     Realized Gain on Investments.....     7,559
  Net Unrealized Appreciation of:
     Investment Securities............   161,551
     Index Futures Contracts..........       895
                                        --------
  Net Assets for 331,716 Shares
     Outstanding......................  $611,032
                                        ========
  Net Asset Value, Offering and
     Redemption Price per Share.......   $1.84
</TABLE>
 
STATEMENT OF OPERATIONS
FOR THE SIX MONTHS ENDED JUNE 30, 1996
 
<TABLE>
<S>                                      <C>
INVESTMENT INCOME
  Income
     Dividends (less foreign dividend
       tax of $42).....................  $ 5,494
     Interest..........................    1,412
                                         --------
       Total Income....................    6,906
                                         --------
  Expenses
     Management Fees...................      552
     Custodian Fees....................       33
     Other Expenses....................       23
                                         --------
       Total Expenses..................      608
                                         --------
          Less Custodian Fees:
            Paid by Affiliate..........      (29)
            Paid Indirectly............       (4)
                                         --------
       Total Net Expenses..............      575
                                         --------
  Net Investment Income................    6,331
                                         --------
REALIZED AND UNREALIZED
  GAIN ON INVESTMENTS
  Net Realized Gain on Investments:
     Investment Securities.............    4,923
     Index Futures Contracts...........    2,998
                                         --------
       Net Realized Gain on
          Investments for the Period...    7,921
                                         --------
  Net Change in Unrealized
     Appreciation of:
     Investment Securities.............   38,134
     Index Futures Contracts...........      147
                                         --------
       Net Change in Unrealized
          Appreciation of Investments
          for
          the Period...................   38,281
                                         --------
  Net Gain on Investments..............   46,202
                                         --------
  NET INCREASE IN NET ASSETS
     RESULTING FROM OPERATIONS.........  $52,533
                                         ========
</TABLE>
 
    The Accompanying Notes are an Integral Part of the Financial Statements
                       (Prepared from Unaudited Figures)
 
                                       17
<PAGE>   21
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                           INDEX 500 STOCK PORTFOLIO
                       STATEMENT OF CHANGES IN NET ASSETS
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                  FOR THE
                                                                                SIX MONTHS       FOR THE
                                                                                   ENDED        YEAR ENDED
                                                                                 JUNE 30,      DECEMBER 31,
                                                                                   1996            1995
                                                                                -----------    ------------
<S>                                                                             <C>            <C>
INCREASE IN NET ASSETS
  Operations
     Net Investment Income...................................................    $   6,331       $ 10,021
     Net Realized Gain on Investments........................................        7,921          8,912
     Net Change in Unrealized Appreciation of Investments for the Period.....       38,281        105,468
                                                                                  --------       --------
       Net Increase in Net Assets Resulting from Operations..................       52,533        124,401
                                                                                  --------       --------
  Dividends to Shareholders from:
     Net Investment Income...................................................       (6,192)        (3,894)
     Net Realized Gain on Investments........................................       (9,632)            --
                                                                                  --------       --------
       Net Decrease in Net Assets Resulting from Dividend to Shareholders....      (15,824)        (3,894)
                                                                                  --------       --------
  Fund Share Transactions
     Proceeds from Sale of 39,509 and 47,195 Shares..........................       71,202         72,382
     Proceeds from Shares Issued on Reinvestment of Dividends Paid
       (9,021 and 2,593 shares, respectively)................................       15,824          3,894
     Payments for 4,332 and 11,954 Shares Redeemed...........................       (7,836)       (17,773)
                                                                                  --------       --------
       Net Increase in Net Assets Resulting from Fund Share Transactions
          (44,198 and 37,834 shares, respectively)...........................       79,190         58,503
                                                                                  --------       --------
  Total Increase in Net Assets...............................................      115,899        179,010
NET ASSETS
  Beginning of Period........................................................      495,133        316,123
                                                                                  --------       --------
  End of Period (includes undistributed net investment income of
     $6,331 and $6,192 respectively).........................................    $ 611,032       $495,133
                                                                                  ========       ========
</TABLE>
 
    The Accompanying Notes are an Integral Part of the Financial Statements
                       (Prepared from Unaudited Figures)
 
                                       18
<PAGE>   22
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                           INDEX 500 STOCK PORTFOLIO
                              FINANCIAL HIGHLIGHTS
                (FOR A SHARE OUTSTANDING THROUGHOUT THE PERIOD)
 
<TABLE>
<CAPTION>
                                                FOR THE
                                              SIX MONTHS                       FOR THE YEARS
                                                 ENDED                      ENDED DECEMBER 31,
                                             JUNE 30, 1996   -------------------------------------------------
                                              (UNAUDITED)      1995       1994      1993      1992      1991
                                             -------------   --------   --------   -------   -------   -------
<S>                                          <C>             <C>        <C>        <C>       <C>       <C>
SELECTED PER SHARE DATA
Net Asset Value, Beginning of Period.......    $  1.72       $ 1.27     $ 1.29     $1.33     $1.31     $1.04
  Income from Investment Operations:
     Net Investment Income.................       0.02         0.04       0.03      0.04      0.03      0.03
     Net Realized and Unrealized Gain
       (Loss) on Investments...............       0.15         0.42      (0.01)     0.09      0.03      0.27
                                             ---------       ----- ---  ----- ---  -------
                                                                                             --- ---   --- ---
                                                                                              -         -
       Total from Investment Operations....       0.17         0.46       0.02      0.13
                                                                                              0.06      0.30
                                             ---------       ----- ---  ----- ---  -------
                                                                                             --- ---   --- ---
                                                                                              -         -
  Less Distributions:
     Dividends from Net Investment
       Income..............................      (0.02)       (0.01)     (0.03)    (0.03)    (0.03)    (0.03)
     Distributions from Realized Gains on
       Investments.........................      (0.03)         --       (0.01)    (0.14)    (0.01)      --
                                             ---------       ----- ---  ----- ---  -------
                                                                                             --- ---   --- ---
                                                                                              -         -
       Total Distributions.................      (0.05)       (0.01)     (0.04)    (0.17)
                                                                                             (0.04)    (0.03)
                                             ---------       ----- ---  ----- ---  -------
                                                                                             --- ---   --- ---
                                                                                              -         -
Net Asset Value, End of Period.............    $  1.84       $ 1.72     $ 1.27     $1.29
                                                                                             $1.33     $1.31
                                             =========       ========   ========   =======
                                                                                             =======   =======
Total Return+..............................      10.03++      37.25%      1.21%     9.90%
                                                                                              4.54%    29.78%
                                             =========       ========   ========   =======
                                                                                             =======   =======
RATIOS AND SUPPLEMENTAL DATA
Net Assets, End of Period (in thousands)...  $611,032        $495,133   $316,123   $25,479   $17,288   $14,115
                                             =========       ========   ========   =======   =======   =======
Ratio of Expenses to Average Net Assets....       0.21%*       0.21%      0.24%     0.30%     0.30%     0.30%
                                             =========       ========   ========   =======   =======   =======
Ratio of Net Investment Income to Average
  Net Assets...............................       2.27%*       2.51%      3.10%     2.55%     2.61%     2.88%
                                             =========       ========   ========   =======   =======   =======
Portfolio Turnover Rate....................       1.91%        3.19%      5.59%    62.69%    39.93%    40.16%
                                             =========       ========   ========   =======   =======   =======
</TABLE>
 
 * Computed on an annualized basis.
 + Total Return includes deductions for management and other fund expenses;
   excludes deductions for sales loads and account fees.
++ Reflects total return for the period; not annualized.
 
    The Accompanying Notes are an Integral Part of the Financial Statements
 
                                       19
<PAGE>   23
 
                            FINANCIAL STATEMENTS OF
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                             GROWTH STOCK PORTFOLIO
                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
 
STATEMENT OF ASSETS AND LIABILITIES
JUNE 30, 1996
 
<TABLE>
<S>                                     <C>
ASSETS
  Common Stocks
     (cost $98,082)...................  $117,839
  Money Market Investments
     (cost $8,180)....................     8,180
                                        --------
                                         126,019
  Cash................................       269
  Due from Sale of Securities.........       373
  Due from Sale of Fund Shares........       297
  Dividends and Interest Receivable...       120
                                        --------
       Total Assets...................   127,078
                                        --------
LIABILITIES
  Due on Purchase of Securities.......       705
  Due to Investment Advisor...........        49
  Due on Redemption of Fund Shares....        14
  Accrued Expenses....................        13
                                        --------
       Total Liabilities..............       781
                                        --------
NET ASSETS............................  $126,297
                                        ========
REPRESENTED BY:
  Aggregate Paid in Capital
     (400,000 shares authorized,
     $.01 par value; 90,897 shares
     outstanding).....................  $103,053
  Undistributed Net Investment
     Income...........................       759
  Undistributed Accumulated Net
     Realized
     Gain on Investments..............     2,723
  Net Unrealized Appreciation of:
     Investment Securities............    19,757
     Foreign Currency Transactions....         5
                                        --------
  Net Assets for 90,897 Shares
     Outstanding......................  $126,297
                                        ========
  Net Asset Value, Offering and
     Redemption Price per Share.......   $1.39
</TABLE>
 
STATEMENT OF OPERATIONS
FOR THE SIX MONTHS ENDED JUNE 30, 1996
 
<TABLE>
<S>                                      <C>
INVESTMENT INCOME
  Income
     Dividends (less foreign dividend
       tax of $3)......................  $   855
     Interest..........................      210
                                         -------
       Total Income....................    1,065
                                         -------
  Expenses
     Management Fees...................      281
     Custodian Fees....................        9
     Other Expenses....................       25
                                         -------
       Total Expenses..................      315
                                         -------
       Less Custodian Fees:
          Paid by Affiliate............       (7)
          Paid Indirectly..............       (2)
                                         -------
       Total Net Expenses..............      306
                                         -------
  Net Investment Income................      759
                                         -------
REALIZED AND UNREALIZED
  GAIN ON INVESTMENTS
  AND FOREIGN CURRENCIES
  Net Realized Gain on Investments.....    2,723
  Net Change in Unrealized Appreciation
     of:
     Investment Securities.............    6,774
     Foreign Currency Transactions.....        2
                                         -------
     Net Change in Unrealized
       Appreciation
       of Investments for the Period...    6,776
                                         -------
  Net Gain on Investments..............    9,499
                                         -------
NET INCREASE IN NET ASSETS
  RESULTING FROM OPERATIONS............  $10,258
                                         =======
</TABLE>
 
    The Accompanying Notes are an Integral Part of the Financial Statements
                       (Prepared from Unaudited Figures)
 
                                       20
<PAGE>   24
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                             GROWTH STOCK PORTFOLIO
                       STATEMENT OF CHANGES IN NET ASSETS
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                 FOR THE
                                                                                SIX MONTHS      FOR THE
                                                                                  ENDED        YEAR ENDED
                                                                                 JUNE 30,     DECEMBER 31,
                                                                                   1996           1995
                                                                                ----------    ------------
<S>                                                                             <C>           <C>
INCREASE IN NET ASSETS
  Operations
     Net Investment Income...................................................    $    759       $  1,109
     Net Realized Gain on Investments........................................       2,723          2,321
     Net Change in Unrealized Appreciation of Investments for the Period.....       6,776         13,078
                                                                                 --------        -------
       Net Increase in Net Assets Resulting from Operations..................      10,258         16,508
                                                                                 --------        -------
  Dividends to Shareholders from:
     Net Investment Income...................................................         (11)        (1,105)
     Net Realized Gain on Investments........................................        (621)        (1,582)
                                                                                 --------        -------
       Net Decrease in Net Assets Resulting from Dividends to Shareholders...        (632)        (2,687)
                                                                                 --------        -------
  Fund Share Transactions
     Proceeds from Sale of 23,218 and 24,515 Shares..........................      31,201         28,181
     Proceeds from Shares Issued on Reinvestment of Dividends Paid
       (476 and 2,177 shares, respectively)..................................         632          2,687
     Payments for 531 and 866 Shares Redeemed................................        (719)        (1,000)
                                                                                 --------        -------
       Net Increase in Net Assets Resulting from Fund Share Transactions
          (23,163 and 25,826 shares, respectively)...........................      31,114         29,868
                                                                                 --------        -------
  Total Increase in Net Assets...............................................      40,740         43,689
NET ASSETS
  Beginning of Period........................................................      85,557         41,868
                                                                                 --------        -------
  End of Period (includes undistributed net investment income of
     $759 and $11, respectively).............................................    $126,297       $ 85,557
                                                                                 ========        =======
</TABLE>
 
    The Accompanying Notes are an Integral Part of the Financial Statements
                       (Prepared from Unaudited Figures)
 
                                       21
<PAGE>   25
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                             GROWTH STOCK PORTFOLIO
                              FINANCIAL HIGHLIGHTS
                (FOR A SHARE OUTSTANDING THROUGHOUT THE PERIOD)
 
<TABLE>
<CAPTION>
                                                                                                   FOR THE
                                                                    FOR THE                         PERIOD
                                                                  SIX MONTHS                        MAY 3,
                                                                     ENDED         FOR THE          1994*
                                                                   JUNE 30,       YEAR ENDED       THROUGH
                                                                     1996        DECEMBER 31,    DECEMBER 31,
                                                                  (UNAUDITED)        1995            1994
                                                                  -----------    ------------    ------------
<S>                                                               <C>            <C>             <C>
SELECTED PER SHARE DATA
Net Asset Value, Beginning of Period...........................    $  1.26         $ 1.00          $ 1.00
  Income from Investment Operations:
     Net Investment Income.....................................       0.01           0.02            0.01
     Net Realized and Unrealized Gains on Investments..........       0.13           0.28             --
                                                                  --------       --- --- --      --- --- --
       Total from Investment Operations........................       0.14           0.30            0.01
                                                                  --------       --- --- --      --- --- --
  Less Distributions:
     Dividends from Net Investment Income......................      --             (0.02)          (0.01)
     Distributions from Realized Gains on Investments..........      (0.01)         (0.02)            --
                                                                  --------       --- --- --      --- --- --
       Total Distributions.....................................      (0.01)         (0.04)          (0.01)
                                                                  --------       --- --- --      --- --- --
Net Asset Value, End of Period.................................    $  1.39         $ 1.26          $ 1.00
                                                                  ========       ========        ========
Total Return+..................................................      10.60%++       30.82%           1.55%++
                                                                  ========       ========        ========
RATIOS AND SUPPLEMENTAL DATA
Net Assets, End of Period (in thousands).......................   $126,297       $85,557         $41,868
                                                                  ========       ========        ========
Ratio of Expenses to Average Net Assets........................       0.55%**        0.61%           0.71%**
                                                                  ========       ========        ========
Ratio of Net Investment Income to Average Net Assets...........       1.43%**        1.77%           2.30%**
                                                                  ========       ========        ========
Portfolio Turnover Rate........................................      20.14%         46.83%          16.51%
                                                                  ========       ========        ========
</TABLE>
 
 * Commencement of Operations.
 
** Computed on an annualized basis.
 
 + Total Return includes deductions for management and other fund expenses;
   excludes deductions for sales loads and account fees.
 
++ Reflects total return for the period; not annualized.
 
    The Accompanying Notes are an Integral Part of the Financial Statements
 
                                       22
<PAGE>   26
 
                            FINANCIAL STATEMENTS OF
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                       GROWTH AND INCOME STOCK PORTFOLIO
                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
 
STATEMENT OF ASSETS AND LIABILITIES
JUNE 30, 1996
 
<TABLE>
<S>                                     <C>
ASSETS
  Common Stocks
     (cost $164,916)................... $177,880
  Money Market Investments
     (cost $6,785).....................    6,785
                                        --------
                                         184,665
  Cash.................................      389
  Due from Sale of Securities..........      530
  Dividends and Interest Receivable....      262
  Due from Sale of Fund Shares.........       91
                                        --------
       Total Assets....................  185,937
                                        --------
LIABILITIES
  Due to Investment Advisor............       86
  Accrued Expenses.....................       25
  Due on Redemption of Fund Shares.....       19
  Due on Purchase of Securities........        3
                                        --------
       Total Liabilities...............      133
                                        --------
NET ASSETS............................. $185,804
                                        ========
REPRESENTED BY:
  Aggregate Paid in Capital
     (400,000 shares authorized,
     $.01 par value; 146,104 shares
     outstanding)...................... $162,045
  Undistributed Net Investment
     Income............................    1,284
  Undistributed Accumulated Net
     Realized Gain on Investments......    9,511
  Net Unrealized Appreciation of
     Investments.......................   12,964
                                        --------
  Net Assets for 146,104 Shares
     Outstanding....................... $185,804
                                        ========
  Net Asset Value, Offering and
     Redemption Price per Share........  $1.27
</TABLE>
 
STATEMENT OF OPERATIONS
FOR THE SIX MONTHS ENDED JUNE 30, 1996
 
<TABLE>
<S>                                      <C>
INVESTMENT INCOME
  Income
     Dividends (less foreign dividend
       tax of $15)...................... $ 1,627
     Interest...........................     162
                                         -------
       Total Income.....................   1,789
                                         -------
  Expenses
     Management Fees....................     492
     Custodian Fees.....................      14
     Other Expenses.....................      13
                                         -------
       Total Expenses...................     519
                                         -------
          Less Custodian Fees:
            Paid by Affiliate...........     (11)
            Paid Indirectly.............      (3)
                                         -------
       Total Net Expenses...............     505
                                         -------
  Net Investment Income.................   1,284
                                         -------
REALIZED AND UNREALIZED
  GAIN (LOSS) ON INVESTMENTS
  Net Realized Gain on Investments......   9,511
  Net Change in Unrealized Depreciation
     of Investments for the Period......    (230)
                                         -------
  Net Gain on Investments...............   9,281
                                         -------
NET INCREASE IN NET ASSETS
  RESULTING FROM OPERATIONS............. $10,565
                                         =======
</TABLE>
 
    The Accompanying Notes are an Integral Part of the Financial Statements
                       (Prepared from Unaudited Figures)
 
                                       23
<PAGE>   27
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                       GROWTH AND INCOME STOCK PORTFOLIO
                       STATEMENT OF CHANGES IN NET ASSETS
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                 FOR THE
                                                                                SIX MONTHS      FOR THE
                                                                                  ENDED        YEAR ENDED
                                                                                 JUNE 30,     DECEMBER 31,
                                                                                   1996           1995
                                                                                ----------    ------------
<S>                                                                             <C>           <C>
INCREASE IN NET ASSETS
  Operations
     Net Investment Income...................................................    $  1,284       $  1,680
     Net Realized Gain on Investments........................................       9,511          9,722
     Net Change in Unrealized Appreciation (Depreciation) of Investments
       for the Period........................................................        (230)        14,711
                                                                                ---------      ---------
       Net Increase in Net Assets Resulting from Operations..................      10,565         26,113
                                                                                ---------      ---------
  Dividends to Shareholders from:
     Net Investment Income...................................................         (17)        (1,667)
     Net Realized Gain on Investments........................................      (3,389)        (6,435)
                                                                                ---------      ---------
       Net Decrease in Net Assets Resulting from Dividend to Shareholders....      (3,406)        (8,102)
                                                                                ---------      ---------
  Fund Share Transactions
     Proceeds from Sale of 31,096 and 41,708 Shares..........................      39,349         47,441
     Proceeds from Shares Issued on Reinvestment of Dividends Paid
       (2,726 and 6,769 shares, respectively)................................       3,406          8,102
     Payments for 808 and 1,144 Shares Redeemed..............................      (1,033)        (1,331)
                                                                                ---------      ---------
       Net Increase in Net Assets Resulting from Fund Share Transactions
          (33,014 and 47,333 shares, respectively)...........................      41,722         54,212
                                                                                ---------      ---------
  Total Increase in Net Assets...............................................      48,881         72,223
NET ASSETS
  Beginning of Period........................................................     136,923         64,700
                                                                                ---------      ---------
  End of Period (includes undistributed net investment income of
     $1,284 and $17, respectively)...........................................    $185,804       $136,923
                                                                                =========      =========
</TABLE>
 
    The Accompanying Notes are an Integral Part of the Financial Statements
                       (Prepared from Unaudited Figures)
 
                                       24
<PAGE>   28
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                       GROWTH AND INCOME STOCK PORTFOLIO
                              FINANCIAL HIGHLIGHTS
                (FOR A SHARE OUTSTANDING THROUGHOUT THE PERIOD)
 
<TABLE>
<CAPTION>
                                                                                                   FOR THE
                                                                  FOR THE                           PERIOD
                                                                SIX MONTHS                          MAY 3,
                                                                   ENDED          FOR THE           1994*
                                                                 JUNE 30,        YEAR ENDED        THROUGH
                                                                   1996         DECEMBER 31,     DECEMBER 31,
                                                                (UNAUDITED)         1995             1994
                                                                -----------     ------------     ------------
<S>                                                             <C>             <C>              <C>
SELECTED PER SHARE DATA
Net Asset Value, Beginning of Period.........................    $  1.21          $ 0.98           $ 1.00
  Income from Investment Operations:
     Net Investment Income...................................       0.01            0.02             0.01
     Net Realized and Unrealized Gains on Investments........       0.08            0.29            (0.01)
                                                                --------        ----- ---        -------
       Total from Investment Operations......................       0.09            0.31            (0.00)
                                                                --------        ----- ---        -------
  Less Distributions:
     Dividends from Net Investment Income....................      --              (0.02)           (0.01)
     Distributions from Realized Gains on Investments........      (0.03)          (0.06)           (0.01)
                                                                --------        ----- ---        -------
       Total Distributions...................................      (0.03)          (0.08)           (0.02)
                                                                --------        ----- ---        -------
Net Asset Value, End of Period...............................    $  1.27          $ 1.21           $ 0.98
                                                                ========        ========         =======
Total Return+................................................       7.16%++        31.12%            0.34%++
                                                                ========        ========         =======
RATIOS AND SUPPLEMENTAL DATA
Net Assets, End of Period (in thousands).....................   $185,804        $136,923         $64,700
                                                                ========        ========         =======
Ratio of Expenses to Average Net Assets......................       0.62%**         0.69%            0.78%**
                                                                ========        ========         =======
Ratio of Net Investment Income to Average Net Assets.........       1.58%**         1.68%            1.93%**
                                                                ========        ========         =======
Portfolio Turnover Rate......................................      43.06%          80.00%           54.18%
                                                                ========        ========         =======
</TABLE>
 
 * Commencement of Operations.
** Computed on an annualized basis.
 + Total Return includes deductions for management and other fund expenses;
   excludes deductions for sales loads and account fees.
++ Reflects total return for the period; not annualized.
 
    The Accompanying Notes are an Integral Part of the Financial Statements
 
                                       25
<PAGE>   29
 
                            FINANCIAL STATEMENTS OF
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                       AGGRESSIVE GROWTH STOCK PORTFOLIO
                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
 
STATEMENT OF ASSETS AND LIABILITIES
JUNE 30, 1996
 
<TABLE>
<S>                                     <C>
ASSETS
  Common Stocks
     (cost $496,806)..................  $ 746,093
  Money Market Investments
     (cost $53,273)...................     53,273
                                         --------
                                          799,366
  Cash................................      1,886
  Due from Sale of Securities.........      2,797
  Due from Sale of Fund Shares........         49
  Dividends and Interest Receivable...         49
                                         --------
       Total Assets...................    804,147
                                         --------
LIABILITIES
  Due on Purchase of Securities.......      5,707
  Due to Investment Advisor...........        323
  Due on Redemption of Fund Shares....        177
  Accrued Expenses....................         22
                                         --------
       Total Liabilities..............      6,229
                                         --------
NET ASSETS............................  $ 797,918
                                         ========
REPRESENTED BY:
  Aggregate Paid in Capital
     (700,000 shares authorized,
     $.01 par value; 251,258 shares
     outstanding).....................  $ 500,865
  Undistributed Net Investment Loss...       (264)
  Undistributed Accumulated Net
     Realized Gain on Investments.....     48,030
  Net Unrealized Appreciation of
     Investments......................    249,287
                                         --------
  Net Assets for 251,258 Shares
     Outstanding......................  $ 797,918
                                         ========
  Net Asset Value, Offering and
     Redemption Price per Share.......      $3.18
</TABLE>
 
STATEMENT OF OPERATIONS
FOR THE SIX MONTHS ENDED JUNE 30, 1996
 
<TABLE>
<S>                                     <C>
INVESTMENT INCOME
  Income
     Interest.........................  $   1,178
     Dividends (less foreign dividend
       tax of $2).....................        367
                                         --------
       Total Income...................      1,545
                                         --------
  Expenses
     Management Fees..................      1,796
     Custodian Fees...................         20
     Other............................         13
                                         --------
       Total Expenses.................      1,829
                                         --------
          Less Custodian Fees:
            Paid by Affiliate.........        (10)
            Paid Indirectly...........        (10)
                                         --------
       Total Net Expenses.............      1,809
                                         --------
  Net Investment Loss.................       (264)
                                         --------
REALIZED AND UNREALIZED
  GAIN ON INVESTMENTS
  Net Realized Gain on Investments....     48,030
  Net Change in Unrealized
     Appreciation of Investments for
     the Period.......................     67,014
                                         --------
  Net Gain on Investments.............    115,044
                                         --------
NET INCREASE IN NET ASSETS
  RESULTING FROM OPERATIONS...........  $ 114,780
                                         ========
</TABLE>
 
    The Accompanying Notes are an Integral Part of the Financial Statements
                       (Prepared from Unaudited Figures)
 
                                       26
<PAGE>   30
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                       AGGRESSIVE GROWTH STOCK PORTFOLIO
                       STATEMENT OF CHANGES IN NET ASSETS
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                 FOR THE
                                                                                SIX MONTHS      FOR THE
                                                                                  ENDED        YEAR ENDED
                                                                                 JUNE 30,     DECEMBER 31,
                                                                                   1996           1995
                                                                                ----------    ------------
<S>                                                                             <C>           <C>
INCREASE IN NET ASSETS
  Operations
     Net Investment Income (Loss)............................................    $   (264)      $    572
     Net Realized Gain on Investments........................................      48,030         24,986
     Net Change in Unrealized Appreciation of Investments for the Period.....      67,014        124,412
                                                                                ---------      ---------
       Net Increase in Net Assets Resulting from Operations..................     114,780        149,970
                                                                                ---------      ---------
  Dividends to Shareholders from:
     Net Investment Income...................................................        (572)          (503)
     Net Realized Gain on Investments........................................     (24,986)        (1,836)
                                                                                ---------      ---------
       Net Decrease in Net Assets Resulting from Dividend to Shareholders....     (25,558)        (2,339)
                                                                                ---------      ---------
Fund Share Transactions
  Proceeds from Sale of 35,751 and 50,142 Shares.............................     108,986        115,824
  Proceeds from Shares Issued on Reinvestment of Dividends Paid
     (8,276 and 1,097 shares, respectively)..................................      25,558          2,339
  Payments for 977 and 6,659 Shares Redeemed.................................      (2,862)       (15,876)
                                                                                ---------      ---------
     Net Increase in Net Assets Resulting from Fund Share Transactions
       (43,050 and 44,580 shares, respectively)..............................     131,682        102,287
                                                                                ---------      ---------
  Total Increase in Net Assets...............................................     220,904        249,918
NET ASSETS
  Beginning of Period........................................................     577,014        327,096
                                                                                ---------      ---------
  End of Period (includes undistributed net investment (loss)/income of
     ($264) and $572, respectively)..........................................    $797,918       $577,014
                                                                                =========      =========
</TABLE>
 
    The Accompanying Notes are an Integral Part of the Financial Statements
                       (Prepared from Unaudited Figures)
 
                                       27
<PAGE>   31
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                       AGGRESSIVE GROWTH STOCK PORTFOLIO
                              FINANCIAL HIGHLIGHTS
                (FOR A SHARE OUTSTANDING THROUGHOUT THE PERIOD)
 
<TABLE>
<CAPTION>
                                                                                                   FOR THE
                                                                    FOR THE                         PERIOD
                                                                  SIX MONTHS                        MAY 3,
                                                                     ENDED         FOR THE          1994*
                                                                   JUNE 30,       YEAR ENDED       THROUGH
                                                                     1996        DECEMBER 31,    DECEMBER 31,
                                                                  (UNAUDITED)        1995            1994
                                                                  -----------    ------------    ------------
<S>                                                               <C>            <C>             <C>
SELECTED PER SHARE DATA
Net Asset Value, Beginning of Period...........................    $  2.77         $ 2.00          $ 1.91
  Income from Investment Operations:
     Net Investment Income.....................................       --              --              --
     Net Realized and Unrealized Gains on Investments..........       0.52           0.78            0.09
                                                                  ---------      ----- ----      ----- ----
       Total from Investment Operations........................       0.52           0.78            0.09
                                                                  ---------      ----- ----      ----- ----
  Less Distributions:
     Dividends from Net Investment Income......................       --              --              --
     Distributions from Realized Gains on Investments..........      (0.11)         (0.01)            --
                                                                  ---------      ----- ----      ----- ----
       Total Distributions.....................................      (0.11)         (0.01)            --
                                                                  ---------      ----- ----      ----- ----
Net Asset Value, End of Period.................................    $  3.18         $ 2.77          $ 2.00
                                                                  =========      =========       =========
Total Return+..................................................      18.86%++       39.29%           4.47%++
                                                                  =========      =========       =========
RATIOS AND SUPPLEMENTAL DATA
Net Assets, End of Period (in thousands).......................   $797,918       $577,014        $327,096
                                                                  =========      =========       =========
Ratio of Expenses to Average Net Assets........................       0.53%**        0.56%           0.58%**
                                                                  =========      =========       =========
Ratio of Net Investment Income/(Loss) to Average Net Assets....      (.08%)**        0.13%           0.29%**
                                                                  =========      =========       =========
Portfolio Turnover Rate........................................      26.74%         37.84%          21.54%
                                                                  =========      =========       =========
</TABLE>
 
 * Commencement of Operations.
** Computed on an annualized basis.
 + Total Return includes deductions for management and other fund expenses;
   excludes deductions for sales loads and account fees.
++ Reflects total return for the period; not annualized.
 
    The Accompanying Notes are an Integral Part of the Financial Statements
 
                                       28
<PAGE>   32
 
                            FINANCIAL STATEMENTS OF
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                         INTERNATIONAL EQUITY PORTFOLIO
                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
 
STATEMENT OF ASSETS AND LIABILITIES
JUNE 30, 1996
 
<TABLE>
<S>                                     <C>
ASSETS
  Common Stocks
     (cost $302,135)................... $351,549
  Money Market Investments
     (cost $51,924)....................   51,924
  Bonds
     (cost $14,284)....................   14,360
                                        --------
                                         417,833
  Cash.................................        1
  Due from Sale of Securities..........   53,934
  Dividends and Interest Receivable....    2,425
  Due from Foreign Currency
     Contracts.........................    2,095
  Due from Purchase of Fund Shares.....      357
                                        --------
       Total Assets....................  476,645
                                        --------
LIABILITIES
  Due on Purchase of Securities........   54,190
  Due on Foreign Currency Contracts....    2,087
  Due on Sale of Fund Shares...........      255
  Accrued Expenses.....................      235
  Due to Investment Advisor............      229
                                        --------
       Total Liabilities...............   56,996
                                        --------
NET ASSETS............................. $419,649
                                        ========
REPRESENTED BY:
  Aggregate Paid in Capital (700,000
     shares authorized, $.01 par value;
     298,651 shares outstanding)....... $360,202
  Undistributed Net Investment
     Income............................    7,658
  Undistributed Accumulated Net
     Realized Gain on Investments......    2,311
  Net Unrealized Appreciation
     (Depreciation) of:
     Investment Securities.............   49,490
     Foreign Currency Transactions.....      (12)
                                        --------
  Net Assets for 298,651 Shares
     Outstanding....................... $419,649
                                        ========
  Net Asset Value, Offering and
     Redemption Price per Share........  $1.41
</TABLE>
 
STATEMENT OF OPERATIONS
FOR THE SIX MONTHS ENDED JUNE 30, 1996
 
<TABLE>
<S>                                      <C>
INVESTMENT INCOME
  Income
     Dividends (less foreign dividend
       tax of $874)..................... $ 7,287
     Interest...........................   1,409
     Other Income.......................      11
                                         -------
       Total Income.....................   8,707
                                         -------
     Reimbursement of Foreign Dividend
       Tax by Affiliate.................     438
                                         -------
       Total Net Income.................   9,145
                                         -------
  Expenses
     Management Fees....................   1,291
     Custodian Fees.....................     201
     Other Expenses.....................      80
                                         -------
       Total Expenses...................   1,572
                                         -------
  Net Investment Income.................   7,573
                                         -------
REALIZED AND UNREALIZED GAIN
  (LOSS) ON INVESTMENTS AND
  FOREIGN CURRENCIES
  Net Realized Gain (Loss) on:
     Investment Securities..............   3,091
     Foreign Currency Transactions......    (328)
                                         -------
       Net Realized Gain for the
          Period........................   2,763
  Net Change in Unrealized Appreciation
     of:
     Investment Securities..............  22,257
     Foreign Currency Transactions......     142
                                         -------
       Net Change in Unrealized
          Appreciation for the Period...  22,399
                                         -------
  Net Gain on Investments...............  25,162
                                         -------
NET INCREASE IN NET ASSETS RESULTING
  FROM OPERATIONS....................... $32,735
                                         =======
</TABLE>
 
    The Accompanying Notes are an Integral Part of the Financial Statements
                       (Prepared from Unaudited Figures)
 
                                       29
<PAGE>   33
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                         INTERNATIONAL EQUITY PORTFOLIO
                       STATEMENT OF CHANGES IN NET ASSETS
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                 FOR THE        FOR THE
                                                                                SIX MONTHS     YEAR ENDED
                                                                                 JUNE 30,     DECEMBER 31,
                                                                                   1996           1995
                                                                                ----------    ------------
<S>                                                                             <C>           <C>
INCREASE IN NET ASSETS
  Operations
     Net Investment Income...................................................    $  7,573       $  8,437
     Net Realized Gain on Investments........................................       2,763         11,455
     Net Change in Unrealized Appreciation of Investments for the Period.....      22,399         22,907
                                                                                ---------      ---------
       Net Increase in Net Assets Resulting from Operations..................      32,735         42,799
                                                                                ---------      ---------
  Dividends to Shareholders from:
     Net Investment Income...................................................      (8,311)        --
     Net Realized Gain on Investments........................................     (11,653)        (2,171)
                                                                                ---------      ---------
       Net Decrease in Net Assets Resulting from Dividend to Share...........     (19,964)        (2,171)
                                                                                ---------      ---------
  Fund Share Transactions
     Proceeds from Sale of 35,551 and 28,399 Shares..........................      50,087         35,839
     Proceeds from Shares Issued on Reinvestment of Dividends Paid
       (14,363 and 1,740 shares, respectively)...............................      19,964          2,171
     Payments for 3,759 and 23,252 Shares Redeemed...........................      (5,300)       (29,044)
                                                                                ---------      ---------
       Net Decrease in Net Assets Resulting from Fund Share Transactions
          (46,155 and 6,887 shares, respectively)............................      64,751          8,966
                                                                                ---------      ---------
Total Increase in Net Assets.................................................      77,522         49,594
NET ASSETS
  Beginning of Period........................................................     342,127        292,533
                                                                                ---------      ---------
  End of Period (includes undistributed net investment income of
     $7,658 and $8,396, respectively)........................................    $419,649       $342,127
                                                                                =========      =========
</TABLE>
 
    The Accompanying Notes are an Integral Part of the Financial Statements
                       (Prepared from Unaudited Figures)
 
                                       30
<PAGE>   34
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                         INTERNATIONAL EQUITY PORTFOLIO
                              FINANCIAL HIGHLIGHTS
 
<TABLE>
<CAPTION>
                                                                    FOR THE                        FOR THE
                                                                  SIX MONTHS                        PERIOD
                                                                     ENDED         FOR THE       MAY 3, 1994*
                                                                   JUNE 30,       YEAR ENDED       THROUGH
                                                                     1996        DECEMBER 31,    DECEMBER 31,
                                                                  (UNAUDITED)        1995            1994
                                                                  -----------    ------------    ------------
<S>                                                               <C>            <C>             <C>
SELECTED PER SHARE DATA
Net Asset Value, Beginning of Period...........................   $   1.35       $   1.19        $   1.22
  Income from Investment Operations:
     Net Investment Income.....................................       0.03           0.04            0.02
     Net Realized and Unrealized Gain (Loss) on Investments....       0.10           0.13           (0.02)
                                                                  --------       --------        --------
       Total from Investment Operations........................       0.13           0.17            0.00
                                                                  --------       --------        --------
  Less Distributions:
     Dividends from Net Investment Income......................      (0.03)           --            (0.02)
     Distributions from Realized Gains on Investments..........      (0.04)         (0.01)          (0.01)
                                                                  --------       --------        --------
       Total Distributions.....................................      (0.07)         (0.01)          (0.03)
                                                                  --------       --------        --------
Net Asset Value, End of Period.................................   $   1.41       $   1.35        $   1.19
                                                                  ========       ========        ========
Total Return+..................................................       9.13%++       14.57%           0.11%++
                                                                  ========       ========        ========
RATIOS AND SUPPLEMENTAL DATA
Net Assets, End of Period (in thousands).......................   $419,649       $342,127        $292,533
                                                                  ========       ========        ========
Ratio of Expenses to Average Net Assets........................       0.82%**        0.85%           0.87%**
                                                                  ========       ========        ========
Ratio of Net Investment Income to Average Net Assets...........       3.95%**        2.68%           2.28%**
                                                                  ========       ========        ========
Portfolio Turnover Rate........................................       6.31%         26.71%          10.97%
                                                                  ========       ========        ========
</TABLE>
 
 * Commencement of Operations.
** Computed on an annualized basis.
 + Total Return includes deductions for management and other fund expenses;
   excludes deductions for sales loads and account fees.
++ Reflects total return for the period; not annualized.
 
    The Accompanying Notes are an Integral Part of the Financial Statements
 
                                       31
<PAGE>   35
 
                            FINANCIAL STATEMENTS OF
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                             SELECT BOND PORTFOLIO
                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
 
STATEMENT OF ASSETS AND LIABILITIES
JUNE 30, 1996
 
<TABLE>
<S>                                     <C>
ASSETS
  Bonds
     (cost $160,416)..................  $160,337
  Money Market Investments
     (cost $39,602)...................    39,609
                                        --------
                                         199,946
  Cash................................        84
  Interest Receivable.................     2,676
                                        --------
       Total Assets...................   202,706
                                        --------
LIABILITIES
  Due on Redemption of Fund Shares....       500
  Due to Investment Advisor...........        46
                                        --------
       Total Liabilities..............       546
                                        --------
NET ASSETS............................  $202,160
                                        ========
REPRESENTED BY:
  Aggregate Paid in Capital
     (400,000 shares authorized,
     $.01 par value; 173,146 shares
     outstanding).....................  $197,636
  Undistributed Net Investment
     Income...........................     6,252
  Undistributed Accumulated Net
     Realized Loss on Investments.....    (1,656)
  Net Unrealized Depreciation of
     Investments......................       (72)
                                        --------
  Net Assets for 173,146 Shares
     Outstanding......................  $202,160
                                        ========
  Net Asset Value, Offering and
     Redemption Price per Share.......   $1.17
</TABLE>
 
STATEMENT OF OPERATIONS
FOR THE SIX MONTHS ENDED JUNE 30, 1996
 
<TABLE>
<S>                                      <C>
INVESTMENT INCOME
  Income
     Interest..........................  $ 6,536
                                          ------
  Expenses
     Management Fees...................      296
                                          ------
  Net Investment Income................    6,240
                                          ------
REALIZED AND UNREALIZED
  LOSS ON INVESTMENTS
  Net Realized Loss on Investments.....     (318)
  Net Unrealized Depreciation of
     Investments for the Period........   (8,843)
                                          ------
  Net Loss on Investments..............   (9,161)
                                          ------
NET DECREASE IN NET ASSETS
  RESULTING FROM OPERATIONS............  $(2,921)
                                          ======
</TABLE>
 
    The Accompanying Notes are an Integral Part of the Financial Statements
                       (Prepared from Unaudited Figures)
 
                                       32
<PAGE>   36
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                             SELECT BOND PORTFOLIO
                       STATEMENT OF CHANGES IN NET ASSETS
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                 FOR THE
                                                                                SIX MONTHS      FOR THE
                                                                                  ENDED        YEAR ENDED
                                                                                 JUNE 30,     DECEMBER 31,
                                                                                   1996           1995
                                                                                ----------    ------------
<S>                                                                             <C>           <C>
INCREASE IN NET ASSETS
  Operations
     Net Investment Income...................................................    $  6,240       $ 11,680
     Net Realized Gain (Loss) on Investments.................................        (318)         1,666
     Net Change in Unrealized Appreciation (Depreciation) of Investments
       for the Period........................................................      (8,843)        17,183
                                                                                 --------       --------
       Net Increase (Decrease) in Net Assets Resulting from Operations.......      (2,921)        30,529
                                                                                 --------       --------
  Dividends to Shareholders from:
     Net Investment Income...................................................      (7,025)        (4,709)
     Net Realized Gain on Investments........................................      --             --
                                                                                 --------       --------
       Net Decrease in Net Assets Resulting from Dividend to Shareholders....      (7,025)        (4,709)
                                                                                 --------       --------
  Fund Share Transactions
     Proceeds from Sale of 13,882 and 20,151 Shares..........................      16,649         23,377
     Proceeds from Shares Issued on Reinvestment of Dividends Paid
       (6,130 and 4,071 shares, respectively)................................       7,025          4,709
     Payments for 8,203 and 12,511 Shares Redeemed...........................      (9,710)       (14,272)
                                                                                 --------       --------
       Net Increase in Net Assets Resulting from Fund Share Transactions
          (11,809 and 11,711 shares, respectively)...........................      13,964         13,814
                                                                                 --------       --------
  Total Increase in Net Assets...............................................       4,018         39,634
NET ASSETS
  Beginning of Period........................................................     198,142        158,508
                                                                                 --------       --------
  End of Period (includes undistributed net investment income of
     $6,252 and $7,037 respectively).........................................    $202,160       $198,142
                                                                                 ========       ========
</TABLE>
 
    The Accompanying Notes are an Integral Part of the Financial Statements
                       (Prepared from Unaudited Figures)
 
                                       33
<PAGE>   37
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                             SELECT BOND PORTFOLIO
                              FINANCIAL HIGHLIGHTS
                (FOR A SHARE OUTSTANDING THROUGHOUT THE PERIOD)
 
<TABLE>
<CAPTION>
                                                     FOR THE
                                                   SIX MONTHS
                                                      ENDED                         FOR THE YEARS
                                                    JUNE 30,                      ENDED DECEMBER 31,
                                                      1996       ----------------------------------------------------
                                                   (UNAUDITED)     1995       1994       1993       1992       1991
                                                   -----------   --------   --------   --------   --------   --------
<S>                                                <C>           <C>        <C>        <C>        <C>        <C>
SELECTED PER SHARE DATA
Net Asset Value, Beginning of Period.............   $  1.23      $ 1.06     $ 1.15     $ 1.14     $ 1.18     $ 1.09
  Income from Investment Operations:
     Net Investment Income.......................      0.04        0.07       0.06       0.08       0.09       0.09
     Net Realized and Unrealized Loss on
       Investments...............................     (0.06)       0.13      (0.08)      0.05        --        0.09
                                                   --------      ----- ---  ----- ---  ----- ---  ----- ---  ----- ---
       Total from Investment Operations..........     (0.02)       0.20      (0.03)      0.13       0.09       0.18
                                                   --------      ----- ---  ----- ---  ----- ---  ----- ---  ----- ---
  Less Distributions:
     Dividends from Net Investment Income........     (0.04)      (0.03)     (0.06)     (0.08)     (0.09)     (0.09)
     Distributions from Realized Gains on
       Investments...............................      --           --         --       (0.04)     (0.04)       --
                                                   --------      ----- ---  ----- ---  ----- ---  ----- ---  ----- ---
       Total Distributions.......................     (0.04)      (0.03)     (0.06)     (0.12)     (0.12)     (0.09)
                                                   --------      ----- ---  ----- ---  ----- ---  ----- ---  ----- ---
Net Asset Value, End of Period...................   $  1.17      $ 1.23     $ 1.06     $ 1.15     $ 1.14     $ 1.18
                                                   ========      ========   ========   ========   ========   ========
Total Return+....................................     (1.41%)++   19.10%     (2.28%)    10.81%      7.74%     17.32%
                                                   ========      ========   ========   ========   ========   ========
RATIOS AND SUPPLEMENTAL DATA
Net Assets, End of Period (in thousands).........  $202,160      $198,142   $158,508   $17,485    $15,851    $14,703
                                                   ========      ========   ========   ========   ========   ========
Ratio of Expenses to Average Net Assets..........      0.30% *     0.30%      0.30%      0.30%      0.30%      0.30%
                                                   ========      ========   ========   ========   ========   ========
Ratio of Net Investment Income to Average Net
  Assets.........................................      6.21% *     6.61%      7.02%      6.40%      7.52%      8.11%
                                                   ========      ========   ========   ========   ========   ========
Portfolio Turnover Rate..........................     90.44%      69.06%    108.00%     67.69%     63.29%     60.88%
                                                   ========      ========   ========   ========   ========   ========
</TABLE>
 
 * Computed on an annualized basis.
 
 + Total Return includes deductions for management and other fund expenses;
   excludes deductions for sales loads and account fees.
 
++ Reflects total return for the period; not annualized.
 
    The Accompanying Notes are an Integral Part of the Financial Statements
 
                                       34
<PAGE>   38
 
                            FINANCIAL STATEMENTS OF
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                           HIGH YIELD BOND PORTFOLIO
                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
 
STATEMENT OF ASSETS AND LIABILITIES
JUNE 30, 1996
 
<TABLE>
<S>                                       <C>
ASSETS
  Bonds
     (cost $62,576)....................   $62,458
  Preferred Stock
     (cost $5,162).....................     5,308
  Money Market Investments
     (cost $3,995).....................     3,995
  Common Stock
     (cost $88)........................        62
                                          -------
                                           71,823
  Dividends and Interest Receivable....       908
                                          -------
       Total Assets....................    72,731
                                          -------
LIABILITIES
  Due on Purchase of Securities........     3,255
  Due on Redemption of Fund Shares.....       225
  Due to Investment Advisor............        30
  Accrued Expenses.....................        15
                                          -------
       Total Liabilities...............     3,525
                                          -------
NET ASSETS.............................   $69,206
                                          =======
REPRESENTED BY:
  Aggregate Paid in Capital
     (400,000 shares authorized,
     $.01 par value; 63,600 shares
     outstanding)......................   $65,077
  Undistributed Net Investment
     Income............................     2,761
  Undistributed Accumulated Net
     Realized Gain on Investments......     1,366
  Net Unrealized Appreciation of
     Investments.......................         2
                                          -------
  Net Assets for 63,600 Shares
     Outstanding.......................   $69,206
                                          =======
Net Asset Value, Offering and               $1.09
  Redemption Price per Share...........   =======
</TABLE>
 
STATEMENT OF OPERATIONS
FOR THE SIX MONTHS ENDED JUNE 30, 1996
 
<TABLE>
<S>                                        <C>
INVESTMENT INCOME
  Income
     Interest...........................   $2,967
     Other Income.......................       94
                                           ------
       Total Income.....................    3,061
                                           ------
Expenses
  Management Fees.......................      179
  Custodian Fees........................        6
  Other Expenses........................       10
                                           ------
       Total Expenses...................      195
                                           ------
          Less Custodian Fees:
            Paid by Affiliate...........       (2)
            Paid Indirectly.............       (4)
                                           ------
       Total Net Expenses...............      189
                                           ------
  Net Investment Income.................    2,872
                                           ------
REALIZED AND UNREALIZED
  GAIN (LOSS) ON INVESTMENTS
  Net Realized Gain on Investments......    1,366
  Net Change in Unrealized Depreciation
     of Investments for the Period......     (232)
                                           ------
  Net Gain on Investments...............    1,134
                                           ------
NET INCREASE IN NET ASSETS
  RESULTING FROM OPERATIONS.............   $4,006
                                           ======
</TABLE>
 
    The Accompanying Notes are an Integral Part of the Financial Statements
                       (Prepared from Unaudited Figures)
 
                                       35
<PAGE>   39
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                           HIGH YIELD BOND PORTFOLIO
                       STATEMENT OF CHANGES IN NET ASSETS
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                      FOR THE
                                                                                     SIX MONTHS      FOR THE
                                                                                       ENDED        YEAR ENDED
                                                                                      JUNE 30,     DECEMBER 31,
                                                                                        1996           1995
                                                                                     ----------    ------------
<S>                                                                                  <C>           <C>
INCREASE IN NET ASSETS
  Operations
     Net Investment Income........................................................    $  2,872       $  4,548
     Net Realized Gain on Investments.............................................       1,366            970
     Net Change in Unrealized Appreciation (Depreciation) of Investments
       for the Period.............................................................        (232)         1,206
                                                                                       -------        -------
       Net Increase in Net Assets Resulting from Operations.......................       4,006          6,724
                                                                                       -------        -------
  Dividends to Shareholders from:
     Net Investment Income........................................................         (73)        (4,604)
     Net Realized Gain on Investments.............................................        (323)          (465)
                                                                                       -------        -------
       Net Decrease in Net Assets Resulting from Dividend to Shareholders.........        (396)        (5,069)
                                                                                       -------        -------
  Fund Share Transactions
     Proceeds from Sale of 9,902 and 14,751 Shares................................      10,511         15,535
     Proceeds from Shares Issued on Reinvestment of Dividends Paid
       (373 and 4,919 shares, respectively).......................................         396          5,069
     Payments for 1,211 and 1,724 Shares Redeemed.................................      (1,285)        (1,822)
                                                                                       -------        -------
       Net Increase in Net Assets Resulting from Fund Share Transactions
          (9,064 and 17,946 shares, respectively).................................       9,622         18,782
                                                                                       -------        -------
  Total Increase in Net Assets....................................................      13,232         20,437
NET ASSETS
  Beginning of Period.............................................................      55,974         35,537
                                                                                       -------        -------
  End of Period (includes underdistributed and overdistributed net investment
     income of
     $2,761 and ($38), respectively)..............................................    $ 69,206       $ 55,974
                                                                                       =======        =======
</TABLE>
 
    The Accompanying Notes are an Integral Part of the Financial Statements
                       (Prepared from Unaudited Figures)
 
                                       36
<PAGE>   40
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                           HIGH YIELD BOND PORTFOLIO
                              FINANCIAL HIGHLIGHTS
                (FOR A SHARE OUTSTANDING THROUGHOUT THE PERIOD)
 
<TABLE>
<CAPTION>
                                                                                                   FOR THE
                                                                    FOR THE                         PERIOD
                                                                  SIX MONTHS                        MAY 3,
                                                                     ENDED         FOR THE          1994*
                                                                   JUNE 30,       YEAR ENDED       THROUGH
                                                                     1996        DECEMBER 31,    DECEMBER 31,
                                                                  (UNAUDITED)        1995            1994
                                                                  -----------    ------------    ------------
<S>                                                               <C>            <C>             <C>
SELECTED PER SHARE DATA
Net Asset Value, Beginning of Period...........................     $1.03          $ 0.97          $ 1.00
  Income from Investment Operations:
     Net Investment Income.....................................      0.05            0.10            0.06
     Net Realized and Unrealized Gain (Loss) on Investments....      0.02            0.07           (0.03)
                                                                  ---------      ----- ----      ----- ----
       Total from Investment Operations........................      0.07            0.17            0.03
                                                                  ---------      ----- ----      ----- ----
  Less Distributions:
     Dividends from Net Investment Income......................       --            (0.10)          (0.06)
     Distributions from Realized Gains on Investments..........     (0.01)          (0.01)            --
                                                                  ---------      ----- ----      ----- ----
       Total Distributions.....................................     (0.01)          (0.11)          (0.06)
                                                                  ---------      ----- ----      ----- ----
Net Asset Value, End of Period.................................     $1.09          $ 1.03          $ 0.97
                                                                  =========      =========       =========
Total Return+..................................................      6.70%++        16.78%           3.02%++
                                                                  =========      =========       =========
RATIOS AND SUPPLEMENTAL DATA
Net Assets, End of Period (in thousands).......................   $69,206        $55,974         $35,537
                                                                  =========      =========       =========
Ratio of Expenses to Average Net Assets........................      0.60%**         0.65%           0.73%**
                                                                  =========      =========       =========
Ratio of Net Investment Income to Average Net Assets...........      9.16%**         9.90%           9.40%**
                                                                  =========      =========       =========
Portfolio Turnover Rate........................................     75.74%         116.57%         119.48%
                                                                  =========      =========       =========
</TABLE>
 
 * Commencement of Operations.
** Computed on an annualized basis.
 + Total Return includes deductions for management and other fund expenses;
   excludes deductions for sales loads and account fees.
++ Reflects total return for the period; not annualized.
 
    The Accompanying Notes are an Integral Part of the Financial Statements
 
                                       37
<PAGE>   41
 
                            FINANCIAL STATEMENTS OF
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                             MONEY MARKET PORTFOLIO
                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
 
STATEMENT OF ASSETS AND LIABILITIES
JUNE 30, 1996
 
<TABLE>
<S>                                     <C>
ASSETS
  Money Market Investments
     (cost $142,363)................... $142,363
  Cash.................................       16
  Due from Sale of Fund Shares.........      778
  Interest Receivable..................      292
                                        --------
       Total Assets....................  143,449
                                        --------
LIABILITIES
  Due to Investment Advisor............       33
  Due on Redemption of Fund Shares.....        5
                                        --------
       Total Liabilities...............       38
                                        --------
NET ASSETS............................. $143,411
                                        ========
REPRESENTED BY:
  Aggregate Paid in Capital
     (300,000 shares authorized,
     $.01 par value; 143,427 shares
     outstanding)...................... $143,411
                                        --------
  Net Assets for 143,427 Shares
     Outstanding....................... $143,411
                                        ========
  Net Asset Value, Offering and
     Redemption Price per Share........  $1.00
                                        ======
</TABLE>
 
STATEMENT OF OPERATIONS
FOR THE SIX MONTHS ENDED JUNE 30, 1996
 
<TABLE>
<S>                                       <C>
INVESTMENT INCOME
  Income
     Interest............................ $3,676
                                          ------
  Expenses
     Management Fees.....................    203
                                          ------
  Net Investment Income..................  3,473
                                          ------
NET INCREASE IN NET ASSETS
  RESULTING FROM OPERATIONS.............. $3,473
                                          ======
</TABLE>
 
    The Accompanying Notes are an Integral Part of the Financial Statements
                       (Prepared from Unaudited Figures)
 
                                       38
<PAGE>   42
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                             MONEY MARKET PORTFOLIO
                       STATEMENT OF CHANGES IN NET ASSETS
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                 FOR THE
                                                                                SIX MONTHS      FOR THE
                                                                                  ENDED        YEAR ENDED
                                                                                 JUNE 30,     DECEMBER 31,
                                                                                   1996           1996
                                                                                ----------    ------------
<S>                                                                             <C>           <C>
INCREASE IN NET ASSETS
  Operations
     Net Investment Income...................................................    $  3,473       $  6,333
                                                                                ---------      ---------
       Net Increase in Net Assets Resulting from Operations..................       3,473          6,333
                                                                                ---------      ---------
  Dividends to Shareholders from:
     Net Investment Income...................................................      (3,473)        (6,333)
                                                                                ---------      ---------
       Net Decrease in Net Assets Resulting from Dividend to Shareholders....      (3,473)        (6,333)
                                                                                ---------      ---------
  Fund Share Transactions
     Proceeds from Sale of 47,658 and 74,140 Shares..........................      47,658         74,140
     Proceeds from Shares Issued on Reinvestment of Dividend Paid
       (3,473 and 6,333 shares, respectively)................................       3,473          6,333
     Payments for 40,292 and 52,118 Shares Redeemed..........................     (40,292)       (52,118)
                                                                                ---------      ---------
       Net Increase in Net Assets Resulting from Fund Share Transactions
          (10,839 and 28,355 shares, respectively)...........................      10,839         28,355
                                                                                ---------      ---------
  Total Increase in Net Assets...............................................      10,839         28,355
NET ASSETS
  Beginning of Period........................................................     132,572        104,217
                                                                                ---------      ---------
  End of Period (includes no undistributed net investment income)............    $143,411       $132,572
                                                                                =========      =========
</TABLE>
 
    The Accompanying Notes are an Integral Part of the Financial Statements
                       (Prepared from Unaudited Figures)
 
                                       39
<PAGE>   43
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                             MONEY MARKET PORTFOLIO
                              FINANCIAL HIGHLIGHTS
                (FOR A SHARE OUTSTANDING THROUGHOUT THE PERIOD)
 
<TABLE>
<CAPTION>
                                        FOR THE
                                      SIX MONTHS
                                         ENDED                            FOR THE YEARS
                                       JUNE 30,                         ENDED DECEMBER 31,
                                         1996        --------------------------------------------------------
                                      (UNAUDITED)      1995        1994        1993        1992        1991
                                      -----------    --------    --------    --------    --------    --------
<S>                                   <C>            <C>         <C>         <C>         <C>         <C>
SELECTED PER SHARE DATA
Net Asset Value, Beginning of
  Period...........................    $  1.00       $ 1.00      $ 1.00      $ 1.00      $ 1.00      $ 1.00
     Net Investment Income.........       0.03         0.06        0.05        0.03        0.03        0.06
  Less Dividends from Net
     Investment Income.............      (0.03)       (0.06)      (0.05)      (0.03)      (0.03)      (0.06)
                                      --------       ----- ---   ----- ---   ----- ---   ----- ---   ----- ---
Net Asset Value, End of Period.....    $  1.00       $ 1.00      $ 1.00      $ 1.00      $ 1.00      $ 1.00
                                      ========       ========    ========    ========    ========    ========
Total Return+......................       2.56% ++     5.82%       4.03%       2.88%       3.49%       5.85%
                                      ========       ========    ========    ========    ========    ========
RATIOS AND SUPPLEMENTAL DATA
Net Assets, End of Period
  (in thousands)...................   $143,411       $132,572    $104,217    $12,657     $14,091     $12,787
                                      ========       ========    ========    ========    ========    ========
Ratio of Expenses to Average Net
  Assets...........................       0.30% *      0.30%       0.30%       0.30%       0.30%       0.30%
                                      ========       ========    ========    ========    ========    ========
Ratio of Net Investment Income to
  Average Net Assets...............       5.04% *      5.61%       4.64%       2.87%       3.40%       5.71%
                                      ========       ========    ========    ========    ========    ========
</TABLE>
 
 * Computed on an annualized basis.
 
 + Total Return includes deductions for management and other fund expenses;
   excludes deductions for sales loads and account fees.
 
++ Reflects total return for the period; not annualized.
 
    The Accompanying Notes are an Integral Part of the Financial Statements
 
                                       40
<PAGE>   44
 
                            FINANCIAL STATEMENTS OF
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                               BALANCED PORTFOLIO
                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
 
STATEMENT OF ASSETS AND LIABILITIES
JUNE 30, 1996
 
<TABLE>
<S>                                   <C>
ASSETS
  Common Stock
     (cost $760,960)................  $1,140,314
  Bonds
     (cost $652,778)................     653,157
  Money Market Investments
     (cost $376,118)................     376,683
  Preferred Stock
     (cost $3)......................          10
                                      ----------
                                       2,170,164
  Cash..............................         636
  Dividends and Interest
     Receivable.....................      13,903
  Due on Futures Variation Margin...         217
  Due from Sale of Fund Shares......         100
                                      ----------
       Total Assets.................   2,185,020
                                      ----------
LIABILITIES
  Due on Redemption of Fund
     Shares.........................       1,509
  Due to Investment Advisor.........         499
                                      ----------
       Total Liabilities............       2,008
                                      ----------
NET ASSETS..........................  $2,183,012
                                      ==========
REPRESENTED BY:
  Aggregate Paid in Capital
     (2,000,000 shares authorized,
     $.01 par value; 1,372,038
     shares
     outstanding)...................  $1,743,137
  Undistributed Net Investment
     Income.........................      42,100
  Undistributed Accumulated Net
     Realized Gain on Investments...      17,037
  Net Unrealized Appreciation of:
     Investment Securities..........     380,305
     Index Futures Contracts........         433
                                      ----------
  Net Assets for 1,372,038 Shares
     Outstanding....................  $2,183,012
                                      ==========
  Net Asset Value, Offering and
     Redemption Price per Share.....    $1.59
                                      =======
</TABLE>
 
STATEMENT OF OPERATIONS
FOR THE SIX MONTHS ENDED JUNE 30, 1996
 
<TABLE>
<S>                                     <C>
INVESTMENT INCOME
  Income
     Dividends (less foreign dividend
       tax of $88)....................  $ 12,215
     Interest.........................    32,996
                                        --------
       Total Income...................    45,211
                                        --------
  Expenses
     Management Fees..................     3,161
                                        --------
  Net Investment Income...............    42,050
                                        --------
REALIZED AND UNREALIZED
  GAIN ON INVESTMENTS
  Net Realized Gain on Investments:
     Investment Securities............    10,965
     Index Futures Contracts..........     2,606
                                        --------
       Net Realized Gain on
          Investments
          for the Period..............    13,571
                                        --------
     Net Change In Unrealized
       Appreciation of:
       Investment Securities..........    48,181
       Index Futures Contracts........     1,691
                                        --------
          Net Change in Unrealized
            Appreciation of
            Investments for
            the Period................    49,872
                                        --------
     Net Gain on Investments..........    63,443
                                        --------
NET INCREASE IN NET ASSETS
  RESULTING FROM OPERATIONS...........  $105,493
                                        ========
</TABLE>
 
    The Accompanying Notes are an Integral Part of the Financial Statements
                       (Prepared from Unaudited Figures)
 
                                       41
<PAGE>   45
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                               BALANCED PORTFOLIO
                       STATEMENT OF CHANGES IN NET ASSETS
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                FOR THE
                                                                               SIX MONTHS      FOR THE
                                                                                 ENDED        YEAR ENDED
                                                                                JUNE 30,     DECEMBER 31,
                                                                                  1996           1995
                                                                               ----------    ------------
<S>                                                                            <C>           <C>
INCREASE IN NET ASSETS
  Operations
     Net Investment Income..................................................   $   42,050     $   83,546
     Net Realized Gain on Investments.......................................       13,571         41,518
     Net Change in Unrealized Appreciation of Investments for the Period....       49,872        318,046
                                                                               -----------   -----------
       Net Increase in Net Assets Resulting from Operations.................      105,493        443,110
                                                                               -----------   -----------
  Dividends to Shareholders from:
     Net Investment Income..................................................      (83,501)       (53,160)
     Net Realized Gain on Investments.......................................      (35,154)        (8,179)
                                                                               -----------   -----------
       Net Decrease in Net Assets Resulting from Dividend to Shareholders...     (118,655)       (61,339)
  Fund Share Transactions
     Proceeds from Sale of 31,420 and 35,282 Shares.........................       50,821         51,862
     Proceeds from Shares Issued on Reinvestment of Dividends Paid
       (77,149 and 44,352 shares, respectively).............................      118,655         61,339
     Payments for 35,049 and 96,890 Shares Redeemed.........................      (56,591)      (138,810)
                                                                               -----------   -----------
       Net Increase (Decrease) in Net Assets Resulting from Fund Share
        Transactions (73,520 and (17,256) shares, respectively).............      112,885        (25,609)
                                                                               -----------   -----------
  Total Increase in Net Assets..............................................       99,723        356,162
NET ASSETS
  Beginning of Period.......................................................    2,083,289      1,727,127
                                                                               -----------   -----------
  End of Period (includes undistributed net investment income of
     $42,100 and $83,551 respectively)......................................   $2,183,012     $2,083,289
                                                                               ===========   ===========
</TABLE>
 
    The Accompanying Notes are an Integral Part of the Financial Statements
                       (Prepared from Unaudited Figures)
 
                                       42
<PAGE>   46
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                               BALANCED PORTFOLIO
                              FINANCIAL HIGHLIGHTS
                (FOR A SHARE OUTSTANDING THROUGHOUT THE PERIOD)
 
<TABLE>
<CAPTION>
                                         FOR THE
                                       SIX MONTHS
                                          ENDED                            FOR THE YEARS
                                        JUNE 30,                         ENDED DECEMBER 31,
                                          1996        --------------------------------------------------------
                                       (UNAUDITED)       1995         1994        1993       1992       1991
                                       -----------    ----------   ----------   --------   --------   --------
<S>                                    <C>            <C>          <C>          <C>        <C>        <C>
SELECTED PER SHARE DATA
Net Asset Value, Beginning of
  Period.............................. $    1.60      $   1.31     $   1.33     $ 1.39     $ 1.40     $ 1.19
  Income from Investment Operations:
     Net Investment Income............      0.03          0.07         0.04       0.06       0.06       0.07
     Net Realized and Unrealized
       Gain on Investments............      0.05          0.27        (0.05)      0.09       0.01       0.21
                                       ---------      --------     --------     ------     ------     ------
       Total from Investment
          Operations..................      0.08          0.34        (0.01)      0.15       0.07       0.28
                                       ---------      --------     --------     ------     ------     ------
  Less Distributions:
     Dividends from Net Investment
       Income.........................     (0.06)        (0.04)       (0.00)     (0.07)     (0.06)     (0.07)
     Distributions from Realized Gains
       on Investments.................     (0.03)        (0.01)       (0.01)     (0.14)     (0.02)       --
                                       ---------      --------     --------     ------     ------     ------
       Total Distributions............     (0.09)        (0.05)       (0.01)     (0.21)     (0.08)     (0.07)
                                       ---------      --------     --------     ------     ------     ------
Net Asset Value, End of Period........ $    1.59      $   1.60     $   1.31     $ 1.33     $ 1.39     $ 1.40
                                       =========      ========     ========     ======     ======     ======
Total Return+.........................     5.07%++       26.39%        0.16%      9.91%      5.61%     23.33%
                                       =========      ========     ========     ======     ======     ======
RATIOS AND SUPPLEMENTAL DATA
Net Assets, End of Period
  (in thousands)...................... $2,183,012     $2,083,289   $1,727,127   $68,910    $66,006    $57,269
                                       ==========     ==========   ==========   =======    =======    =======
Ratio of Expenses to Average Net
  Assets..............................      0.30% *       0.30%        0.30%      0.30%      0.30%      0.30%
                                       =========      ========     ========     ======     ======     ======
Ratio of Net Investment Income to
  Average Net Assets..................      3.93% *       4.40%        4.78%      4.24%      4.45%      5.11%
                                       =========      ========     ========     ======     ======     ======
Portfolio Turnover Rate...............     23.38%        37.28%       42.35%     70.91%     43.28%     55.46%
                                       =========      ========     ========     ======     ======     ======
</TABLE>
 
 * Computed on an annualized basis.
 
 + Total Return includes deductions for management and other fund expenses;
   excludes deductions for sales loads and account fees.
 
++ Reflects total return for the period; not annualized.
 
    The Accompanying Notes are an Integral Part of the Financial Statements
 
                                       43
<PAGE>   47
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                         NOTES TO FINANCIAL STATEMENTS
                                 JUNE 30, 1996
 
Note 1 -- Northwestern Mutual Series Fund, Inc. (the "Series Fund"), is
registered as a diversified open-end investment company under the Investment
Company Act of 1940. The Series Fund consists of the Index 500 Stock Portfolio,
Growth Stock Portfolio, Growth and Income Stock Portfolio, Aggressive Growth
Stock Portfolio, International Equity Portfolio, Select Bond Portfolio, High
Yield Bond Portfolio, Money Market Portfolio, and the Balanced Portfolio (the
"Portfolios"). Shares are presently offered only to The Northwestern Mutual Life
Insurance Company ("Northwestern Mutual Life") and its segregated asset
accounts.
 
On May 3, 1994, five new portfolios commenced operations in the Series Fund:
Growth Stock Portfolio, Growth and Income Stock Portfolio, Aggressive Growth
Stock Portfolio, International Equity Portfolio and High Yield Bond Portfolio.
These five portfolios were organized with 700,000,000 authorized shares of
Common Stock for each of the Aggressive Growth Stock and International Equity
Portfolios and 400,000,000 authorized shares of Common Stock for each of the
Growth Stock, Growth and Income Stock and High Yield Bond Portfolios. Par Value
is $.01 per share. Northwestern Mutual Life purchased 25,000,000 shares each of
the Growth Stock, Growth and Income Stock and High Yield Bond Portfolios at
$1.00 per share.
 
Note 2 -- The preparation of the financial statements in conformity with
generally accepted accounting principles requires management to make estimates
and assumptions that affect the reported amounts of assets and liabilities and
disclosure of contingent 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.
 
Principal accounting policies are summarized below.
 
Note 3 -- Bonds are valued on the basis of prices furnished by a service which
determines prices for normal institutional size trading units of bonds, without
regard to exchange or over-the-counter prices. When quotations are not readily
available, bonds are valued at fair market value determined by procedures
approved by the Board of Directors. Stocks listed on a national or foreign stock
exchange are valued at the final sale price, or final bid price in absence of a
sale. Stocks not listed on a national or foreign stock exchange are valued at
the closing bid price on the over-the-counter market. Money market investments,
other than in the Money Market Portfolio, with maturities exceeding sixty days
but generally not exceeding one year are valued by marking to market on the
basis of an average of the most recent bid prices or yields. Money market
investments with maturities of sixty days or less and all securities in the
Money Market Portfolio are valued on an amortized cost basis or, if the current
market value differs substantially from the amortized cost, by marking to
market.
 
Note 4 -- Securities and other assets and liabilities denominated in foreign
currencies are translated into U.S. dollar amounts at date of valuation.
Purchases and sales of securities and income items denominated in foreign
currencies are translated in U.S. dollar amounts on the respective dates of such
transactions. When the International Equity Portfolio purchases or sells a
foreign security it may enter into a foreign exchange currency contract to
minimize market risk from the trade date to the settlement date of such
transaction. Such foreign exchange currency contracts are marked to market
daily.
 
The International Equity Portfolio does not separately report the results of
operations resulting from changes in foreign exchange rates on investments from
the fluctuations arising from changes in market prices of securities held. Such
fluctuations are included with the net realized and unrealized gain or loss from
investments.
 
Net realized foreign exchange gains or losses arise from sales of foreign
currencies, currency gains or losses realized between the trade date and
settlement date on security transactions, the differences between the amounts of
dividends and foreign withholding taxes recorded on the portfolio's books, and
the U.S. dollar equivalent of the amounts actually received or paid.
 
Note 5 -- The Index 500 Stock and Balanced Portfolios invest in futures
contracts as an alternative to investing in individual securities. The Index 500
Stock and Balanced Portfolios could be exposed to market risk due to changes in
the value of the underlying securities or due to an illiquid secondary market.
Futures contracts are marked to market daily based upon quoted settlement
prices. The Portfolios receive from or pay to brokers an amount of cash equal to
the daily fluctuation in the value of the contracts. Such receipts or payments
are known as "variation margin" and are recorded by the Portfolios as unrealized
gains or losses. When the contract is closed, the Portfolios record a realized
gain or loss equal to the difference between the value of the contract at the
time it was opened and the value at the time it was closed.
 
Note 6 -- Interest income and discounts earned are recorded daily on the accrual
basis and dividend income is recorded on the ex-dividend date or as soon as
information from foreign issuers is available. Where applicable, dividends are
recorded net of foreign dividend tax. Discounts and premiums on securities
purchased are amortized over the life of the respective securities when required
for federal income tax purposes. Securities transactions are
 
                                       44
<PAGE>   48
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                                 JUNE 30, 1996
 
accounted for on the day following the trade date except for money market
investments which are accounted for on the trade date. The basis for determining
cost on sale of securities is identified cost. For the six months ended June 30,
1996, transactions in securities other than money market investments were:
 
<TABLE>
<CAPTION>
                                                TOTAL         U.S. GOVT           TOTAL             U.S. GOVT
                                               SECURITY        SECURITY          SECURITY            SECURITY
                PORTFOLIOS                    PURCHASES       PURCHASES      SALES/MATURITIES    SALES/MATURITIES
- ------------------------------------------   ------------    ------------    ----------------    ----------------
<S>                                          <C>             <C>             <C>                 <C>
Index 500 Stock...........................   $ 67,049,092    $    --           $  9,705,995        $   --
Growth Stock..............................     48,015,236         --             19,830,875            --
Growth and Income Stock...................    105,448,601         --             67,450,080            --
Aggressive Growth Stock...................    262,628,604         --            173,178,541            --
International Equity......................     50,991,321       2,750,538        18,360,516           2,850,000
Select Bond...............................    157,198,467     139,123,709       149,442,682         124,759,393
High Yield Bond...........................     58,204,982         --             45,397,949            --
Balanced..................................    439,009,354     349,485,878       416,467,364         272,176,862
</TABLE>
 
Note 7 -- The Series Fund and its Portfolios are parties to annually renewable
contracts pursuant to which each Portfolio pays a charge for investment
management and administrative services. Each Portfolio pays a monthly fee for
these investment advisory services at an annual rate based on the average daily
net asset values of each Portfolio. For the Index 500 Stock Portfolio the rate
is .20%, and for the Select Bond, Money Market and Balanced Portfolios the rate
is .30%. For the other Portfolios the rate for the investment advisory fee is
graded by the asset size of the Portfolio according to the following schedule:
 
<TABLE>
<CAPTION>
                           PORTFOLIO                               FIRST $50 MILLION    NEXT $50 MILLION    EXCESS
- ----------------------------------------------------------------   -----------------    ----------------    ------
<S>                                                                <C>                  <C>                 <C>
Growth Stock....................................................          .60%                .50%           .40%
Growth and Income Stock.........................................          .70%                .60%           .55%
Aggressive Growth Stock.........................................          .80%                .65%           .50%
International Equity............................................          .85%                .65%           .65%
High Yield Bond.................................................          .60%                .50%           .40%
</TABLE>
 
These amounts are paid to Northwestern Mutual Investment Services, Inc. ("NMIS")
a wholly-owned subsidiary of Northwestern Mutual Life, which is the manager and
investment adviser of the Fund. Northwestern Mutual Life is also a party to the
agreement. Other costs for each Portfolio are paid either by the Portfolios,
Northwestern Mutual Life, or NMIS depending upon the applicable agreement in
place.
 
Certain portfolios pay a portion of their custodian fees indirectly through
expense offset arrangements. Custodian fees are reduced for Portfolios that
maintain compensating balances in non-interest bearing accounts. The portfolios
could have invested the assets used to pay for the custodian fees, had the
assets not been used in the expense offset arrangements. As of June 30, 1996,
the amounts paid through expense offset arrangements are $3,798 in the Index 500
Portfolio, $2,076 in the Growth Stock Portfolio, $2,710 in the Growth and Income
Stock Portfolio, $10,192 in the Aggressive Growth Stock Portfolio and $3,557 in
the High Yield Bond Portfolio.
 
J.P. Morgan Investment Management, Inc. ("J.P. Morgan") and Templeton Investment
Counsel, Inc. ("Templeton Counsel") have been retained under an investment
sub-advisory agreement to provide investment advice and, in general, to conduct
the management investment program of the Growth and Income Stock Portfolio and
the International Equity Portfolio, respectively. Of the advisory fees received
by NMIS from the Growth and Income Stock Portfolio, .45% on the first $100
million of the Portfolio's net assets, .40% on the next $100 million, .35% on
the next $200 million and .30% on the net assets in excess of $400 million will
be paid by NMIS to J.P. Morgan. Of the advisory fees received by NMIS from the
International Equity Portfolio, .50% on the first $100 million of the
Portfolio's net assets and .40% on net assets in excess of $100 million will be
paid by NMIS to Templeton Counsel.
 
Note 8 -- The Series Fund has elected to be taxed as a regulated investment
company meeting certain requirements under the Internal Revenue Code. Since it
expects to distribute all net investment income and net realized capital gains,
the Series Fund anticipates incurring no federal income taxes. A net realized
capital loss of $1,337,853 in the Select Bond Portfolio carried forward from
1994 and is available to offset future net realized capital gains. The amount
expires in 2002. A capital loss carryforward of $366,657 was utilized in the
Select Bond Portfolio during the year ended December 31, 1995. As of June 30,
1996, the federal income tax basis of investments is the same as the cost basis
in the financial statements except for the International Equity Portfolio. The
federal income tax basis of investments was $369,968,435 for the International
Equity Portfolio. The net unrealized appreciation
 
                                       45
<PAGE>   49
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                                 JUNE 30, 1996
 
(depreciation) and the gross unrealized appreciation (depreciation) for federal
income tax purposes are shown below:
 
<TABLE>
<CAPTION>
                                                                               (IN THOUSANDS)
                                                                                         GROWTH AND
                                                                             GROWTH        INCOME       AGGRESSIVE
                                                            INDEX 500         STOCK        STOCK       GROWTH STOCK
                                                         STOCK PORTFOLIO    PORTFOLIO    PORTFOLIO      PORTFOLIO
                                                         ---------------    ---------    ----------    ------------
<S>                                                      <C>                <C>          <C>           <C>
Gross unrealized appreciation.........................      $ 168,345        $ 20,524     $ 17,241       $260,278
Gross unrealized depreciation.........................         (6,794)           (767)      (4,277)       (10,991)
                                                            ---------        --------     --------       --------
Net unrealized appreciation...........................      $ 161,551        $ 19,757     $ 12,964       $249,287
                                                            =========        ========     ========       ========
</TABLE>
 
<TABLE>
<CAPTION>
                                                            INTERNATIONAL                   HIGH YIELD
                                                               EQUITY        SELECT BOND       BOND       BALANCED
                                                              PORTFOLIO       PORTFOLIO     PORTFOLIO     PORTFOLIO
                                                            -------------    -----------    ----------    --------
<S>                                                         <C>              <C>            <C>           <C>
Gross unrealized appreciation............................     $  64,077        $ 2,036       $  2,173     $409,188
Gross unrealized depreciation............................       (16,213)        (2,108)        (2,171)     (28,883)
                                                              ---------        -------       --------     --------
Net unrealized appreciation (depreciation)...............     $  47,864        $   (72)      $      2     $380,305
                                                              =========        =======       ========     ========
</TABLE>
 
Taxable distributions from net investment income and realized capital gains in
the International Equity Portfolio differ from book amounts earned during the
period due to differences in the timing of capital recognition and due to the
reclassification of certain gains or losses from capital to income.
 
For Federal income tax purposes, net unrealized appreciation of $895,075 and
$433,250 on open futures contracts for the Index 500 Stock and Balanced
Portfolios, respectively, is required to be treated as realized gains and
losses.
 
Note 9 -- The costs associated with organizing the five new Portfolios and
certain other initial period costs have been incurred by Northwestern Mutual
Life. The Series Fund is not obligated to repay these costs.
 
Note 10 -- Dividends from net investment income and net realized capital gains
are declared each year for the Index 500 Stock, Growth Stock, Growth and Income
Stock, Aggressive Growth Stock, International Equity, Select Bond, High Yield
Bond and Balanced Portfolios and each business day for the Money Market
Portfolio. Dividend distributions are described below.
 
A dividend was declared on May 6, 1996, payable to shareholders of record on May
6, 1996. Dividends paid from 1995 net investment income and 1995 net capital
gains were as follows:
 
<TABLE>
<CAPTION>
                                                                                 NET
                                                                             INVESTMENT          NET
                                PORTFOLIOS                                     INCOME       CAPITAL GAINS
- --------------------------------------------------------------------------   -----------    -------------
<S>                                                                          <C>            <C>
Index 500 Stock...........................................................   $ 6,191,044     $  9,631,529
Growth Stock..............................................................        10,843          621,491
Growth and Income Stock...................................................        17,236        3,387,875
Aggressive Growth Stock...................................................       571,524       24,985,733
International Equity......................................................     8,311,009       11,652,962
Select Bond...............................................................     7,024,686         --
High Yield Bond...........................................................        73,082          322,834
Balanced..................................................................    83,501,280       35,153,584
</TABLE>
 
Note 11 -- NML voluntarily reimburses the International Equity Portfolio for the
benefit NML receives from foreign dividend taxes charged against the Portfolio.
The amount reimbursed represents approximately 65% of the foreign dividend tax
withheld from the Portfolio. Reimbursements are recorded when foreign dividend
taxes are accrued. This voluntary reimbursement began April 1, 1996 and totals
$437,790 as of June 30, 1996.
 
                                       46
<PAGE>   50
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                           INDEX 500 STOCK PORTFOLIO
                            SCHEDULE OF INVESTMENTS
                                 JUNE 30, 1996
<TABLE>
<CAPTION>
                                                      MARKET
                                                      VALUE
                                         SHARES      (000'S)
                                       ----------    --------
<S>                                    <C>           <C>
COMMON STOCK (92.7%)
AEROSPACE (2.0%)
  Boeing Company                           38,600    $  3,363
  General Dynamics Corporation              7,100         440
  Harris Corporation                        4,300         262
  Lockheed Martin Corporation              22,154       1,861
  McDonnell Douglas Corporation            24,800       1,203
  Northrop Grumman Corporation              6,300         429
  Raytheon Company                         26,700       1,378
  Rockwell International Corporation       24,300       1,391
  United Technologies Corp.                13,600       1,564
                                                     --------
      Total                                            11,891
                                                     --------
AIRLINES (0.3%)
 *AMR Corporation                          10,000         910
  Delta Air Lines Inc.                      6,900         573
  Southwest Airlines Co.                   16,100         469
 *USAir Group, Inc.                         7,100         128
                                                     --------
      Total                                             2,080
                                                     --------
APPAREL TEXTILE (0.5%)
  Brown Group, Inc.                         1,900          33
 *Fruit of the Loom Incorporated           8,500         217
  Liz Claiborne, Inc.                       8,200         284
  Nike, Inc.                               16,000       1,644
  Reebok International Ltd.                 8,200         276
  Russell Corp.                             4,300         119
  Springs Industries, Inc.                  2,200         111
  Stride Rite Corp.                         5,200          43
  VF Corporation                            7,100         423
                                                     --------
      Total                                             3,150
                                                     --------
AUTO & TRUCKS (1.9%)
  Chrysler Corporation                     41,700       2,585
  Ford Motor Company                      131,200       4,248
  General Motors Corporation               84,400       4,420
 *Navistar International Corp.              8,400          83
  PACCAR Incorporated                       4,335         212
                                                     --------
      Total                                            11,548
                                                     --------
AUTO RELATED (0.6%)
  Cooper Tire & Rubber Company              9,300         207
  Dana Corporation                         11,300         350
  Eaton Corporation                         8,700         510
  Echlin Inc.                               6,900         261
  Genuine Parts Company                    13,600         622
  Goodyear Tire & Rubber Company           17,300         835
  Snap-On Incorporated                      4,500         213
  TRW Inc.                                  7,300         656
                                                     --------
      Total                                             3,654
                                                     --------
BANKS (6.5%)
  Banc One Corporation                     50,445       1,715
  Bank of Boston Corporation               12,500         619
  Bank of New York Company Inc.            21,700       1,112
  BankAmerica Corporation                  40,800       3,091
  Bankers Trust New York Corporation        8,900         657
  Barnett Banks Inc.                       10,500         640
  Boatmans Bancshares, Inc.                17,600         706
  Chase Manhattan Corporation              48,656       3,436
  Citicorp                                 54,300       4,486
  Comerica, Inc.                           13,000         580
  Corestates Financial Corp.               24,700         951
 
<CAPTION>
                                                      MARKET
                                                      VALUE
                                         SHARES      (000'S)
                                       ----------    --------
<S>                                    <C>           <C>
BANKS (CONTINUED)
  Fifth Third Bancorp.                     11,400    $    616
  First Bank System Inc.                   15,700         911
  First Chicago Corporation                35,328       1,382
  First Union Corporation                  31,835       1,938
  Fleet Financial Group Inc.               29,330       1,276
  KeyCorp                                  25,900       1,004
  Mellon Bank Corporation                  15,350         875
  J.P. Morgan & Company, Inc.              21,000       1,777
  National City Corp.                      24,700         868
  NationsBank Corp.                        33,400       2,760
  Norwest Corporation                      40,800       1,423
  PNC Financial Corp.                      38,000       1,131
  Republic New York Corporation             6,200         386
  Suntrust Banks Inc.                      25,300         936
  U.S. Bancorp of Oregon                   18,000         650
  Wachovia Corporation                     18,900         827
  Wells Fargo & Company                    10,933       2,612
                                                     --------
      Total                                            39,365
                                                     --------
BEVERAGES (3.9%)
  Anheuser-Busch Companies, Inc.           28,300       2,122
  Brown-Forman Corp.                        7,700         308
  The Coca-Cola Company                   278,600      13,617
  Adolph Coors Co.                          4,200          75
  Pepsico Inc.                            174,900       6,187
  Seagram Company Ltd.                     41,700       1,402
                                                     --------
      Total                                            23,711
                                                     --------
BUILDING & CONSTRUCTION (0.2%)
  Centex Corporation                        3,200         100
  Kaufman & Broad Home Corp.                4,300          62
  Masco Corporation                        17,900         541
  Owens-Corning Fiberglas Corp.             5,800         249
  Pulte Corporation                         3,000          80
  Sherwin-Williams Company                  9,600         446
                                                     --------
      Total                                             1,478
                                                     --------
BUILDING-FOREST PRODUCTS (0.4%)
  Boise Cascade Corporation                 5,400         198
  Champion International                   10,700         447
  Georgia-Pacific Corporation              10,200         724
  Louisiana-Pacific Corporation            12,100         268
  Potlatch Corporation                      3,200         125
  Weyerhaeuser Company                     22,100         939
                                                     --------
      Total                                             2,701
                                                     --------
CHEMICALS (2.4%)
  Air Products & Chemicals, Inc.           12,500         722
  Dow Chemical Company                     27,900       2,120
  E.I. Du Pont De Nemours & Co.            62,600       4,953
  Eastman Chemical Company, Inc.            8,825         537
 *FMC Corporation                           4,200         274
  B.F. Goodrich Company                     5,900         221
  Hercules Incorporated                    12,100         669
  Monsanto Company                         65,800       2,138
  PPG Industries Inc.                      21,100       1,029
  Praxair, Inc.                            17,300         731
  Rohm & Haas Company                       7,400         464
  Union Carbide Corporation                14,900         592
                                                     --------
      Total                                            14,450
                                                     --------
</TABLE>
 
                                       47
<PAGE>   51
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                           INDEX 500 STOCK PORTFOLIO
                            SCHEDULE OF INVESTMENTS
                                 JUNE 30, 1996
<TABLE>
<CAPTION>
                                                      MARKET
                                                      VALUE
                                         SHARES      (000'S)
                                       ----------    --------
<S>                                    <C>           <C>
COMMON STOCK (CONTINUED)
CHEMICALS-SPECIALTY (0.5%)
  Avery Dennison Corp.                      5,900    $    324
  Engelhard Corp.                          16,002         368
  W.R. Grace & Co.                         10,900         773
  Great Lakes Chemical                      7,200         448
  Morton International, Inc.               16,400         611
  Nalco Chemical Company                    7,500         236
  Sigma-Aldrich Corp.                       5,600         300
                                                     --------
      Total                                             3,060
                                                     --------
COAL, GAS AND PIPELINE (0.3%)
  Burlington Resource Inc.                 14,100         606
  Eastern Enterprises                       2,300          76
  ENSERCH Corp.                             7,700         167
  NACCO Industries, Inc.                    1,000          55
  Panenergy Corp.                          16,800         552
  Sonat Inc.                                9,600         432
                                                     --------
      Total                                             1,888
                                                     --------
COMPUTER RELATED (3.5%)
  Alco Standard Corporation                14,300         647
 *Amdahl Corporation                       13,300         143
 *Apple Computer, Inc.                     13,800         290
 *Ceridian Corp.                            7,600         384
 *Compaq Computer Corporation              29,900       1,473
 *Cray Research, Inc.                       2,700          65
 *Data General Corporation                  4,300          56
 *Digital Equipment Corporation            17,100         769
 *EMC Corporation                          25,800         481
 *General Instrument Corp.                 14,100         407
  Hewlett-Packard Company                  56,900       5,669
 *Intergraph Corp.                          5,200          63
  International Business Machines
    Corp.                                  60,700       6,009
  Moore Corporation Ltd.                   11,100         210
  Pitney Bowes Inc.                        16,700         797
 *Silicon Graphics                         18,200         437
 *Sun Microsystems Inc.                    20,500       1,207
 *Tandem Computers Inc.                    13,100         162
 *Unisys Corporation                       19,100         136
  Xerox Corporation                        36,100       1,931
                                                     --------
      Total                                            21,336
                                                     --------
CONTAINERS (0.2%)
  Ball Corporation                          3,400          98
  Bemis Company, Inc.                       5,900         206
  Crown Cork & Seal Company, Inc.          14,300         643
 *Tupperware Corporation                    6,900         292
                                                     --------
      Total                                             1,239
                                                     --------
DIVERSIFIED (1.6%)
  Allied Signal Inc.                       31,600       1,805
  Corning Inc.                             25,800         990
  Dial Corp.                               10,500         301
  EG & G, Inc.                              5,300         113
  ITT Industries Inc.                      13,100         329
  Loews Corp.                              13,200       1,041
  Minnesota Mining & Manufacturing
    Co.                                    46,700       3,222
  Teledyne, Inc.                            6,200         224
  Tenneco Inc.                             19,400         992
  Textron Inc.                              9,400         751
  Whitman Education Group Inc.             11,800         285
                                                     --------
      Total                                            10,053
                                                     --------
 
<CAPTION>
                                                      MARKET
                                                      VALUE
                                         SHARES      (000'S)
                                       ----------    --------
<S>                                    <C>           <C>
DRUGS (5.8%)
  American Home Products Corporation       70,600    $  4,245
 *Amgen Inc.                               29,700       1,604
  Bristol-Myers Squibb Company             56,100       5,049
  Eli Lilly & Company                      61,500       3,997
  Merck & Co., Inc.                       137,000       8,854
  Pharmacia & Upjohn Inc.                  56,905       2,525
  Pfizer Inc.                              71,100       5,075
  Schering-Plough Corporation              41,100       2,579
  Warner-Lambert Company                   30,300       1,666
                                                     --------
      Total                                            35,594
                                                     --------
ELECTRICAL EQUIPMENT (3.5%)
  Emerson Electric Co.                     25,000       2,259
  General Electric Company                185,600      16,054
  W.W. Grainger, Inc.                       5,700         442
  Honeywell Inc.                           14,200         774
  Raychem Corp.                             5,000         359
  Thomas & Betts Corporation                4,500         169
  Westinghouse Electric Corporation        46,600         874
  Whirlpool Corporation                     8,300         412
                                                     --------
      Total                                            21,343
                                                     --------
ELECTRONICS (1.9%)
 *Advanced Micro Devices, Inc.             15,100         206
  AMP Incorporated                         24,272         974
 *Applied Materials Inc.                   20,000         610
  Intel Corp.                              91,700       6,734
 *LSI Logic Corp.                          14,300         372
  Micron Technology                        23,200         600
 *National Semiconductor Corporation       15,100         234
  Perkin-Elmer Corporation                  4,800         232
  Tektronix, Inc.                           3,600         161
  Texas Instruments Incorporated           21,100       1,052
  Tyco International Ltd.                  17,000         693
                                                     --------
      Total                                            11,868
                                                     --------
ENVIRONMENTAL CONTROL (0.5%)
  Browning-Ferris Industries Inc.          23,700         687
  Laidlaw Transportation Limited           32,800         332
  WMX Technologies, Inc.                   55,200       1,808
                                                     --------
      Total                                             2,827
                                                     --------
FEDERAL GOVERNMENT AGENCY RELATED (1.0%)
  Federal Home Loan Mortgage Corp.         20,000       1,710
  Federal National Mortgage Assoc.        121,900       4,084
                                                     --------
      Total                                             5,794
                                                     --------
FINANCIAL SERVICES (2.2%)
  H.F. Ahmanson & Company                  12,900         348
  Alexander & Alexander Services Inc.       5,000          99
  American Express Company                 53,900       2,405
  Beneficial Corporation                    6,000         337
  Dean Witter, Discover & Co.              18,600       1,065
  Golden West Financial Corporation         6,600         370
  Great Western Financial Corporation      15,300         365
  Green Tree Financial Corp.               15,300         478
  Household International Inc.             10,800         821
</TABLE>
 
                                       48
<PAGE>   52
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                           INDEX 500 STOCK PORTFOLIO
                            SCHEDULE OF INVESTMENTS
                                 JUNE 30, 1996
<TABLE>
<CAPTION>
                                                      MARKET
                                                      VALUE
                                         SHARES      (000'S)
                                       ----------    --------
<S>                                    <C>           <C>
COMMON STOCK (CONTINUED)
FINANCIAL SERVICES (CONTINUED)
  MBNA Corp.                               24,900    $    710
  Marsh & Mclennan Companies, Inc.          8,100         782
  Merrill Lynch & Co., Inc.                19,100       1,244
  Morgan Stanley Group Inc.                17,100         840
  Salomon Inc.                             11,700         515
  Transamerica Corporation                  7,600         616
  Travelers Group Inc.                     52,952       2,416
                                                     --------
      Total                                            13,411
                                                     --------
FOOD SERVICE/LODGING (1.1%)
  Darden Restaurant Inc.                   17,800         191
 *Harrahs Entertainment                    11,500         325
  Hilton Hotels Corporation                 5,400         607
 *ITT Corp.                                13,100         868
  Luby's Cafeterias, Inc.                   2,600          61
  Marriott International                   14,300         769
  Mc Donald's Corporation                  78,200       3,656
 *Ryan's Family Steak Houses, Inc.          5,600          52
 *Shoney's Inc.                             4,400          48
  Wendy's International, Inc.              14,200         264
                                                     --------
      Total                                             6,841
                                                     --------
FOODS (2.8%)
  Archer Daniels Midland Company           58,077       1,111
  CPC International Corp.                  16,200       1,166
  Campbell Soup Company                    27,800       1,960
  ConAgra Inc.                             27,100       1,230
  General Mills, Inc.                      17,800         970
  H.J. Heinz Company                       41,250       1,253
  Hershey Foods Corp.                       8,600         631
  Kellogg Company                          23,700       1,736
  Pioneer Hi-Bred International             9,300         492
  Quaker Oats Company                      15,100         515
  Ralston Purina Group                     11,800         757
  Sara Lee Corporation                     54,000       1,748
  Unilever, N.V.                           17,900       2,598
  Wm. Wrigley Jr. Company                  13,000         657
                                                     --------
      Total                                            16,824
                                                     --------
HOSPITAL SUPPLIES (2.9%)
  Abbott Laboratories Inc.                 87,700       3,815
  Allergan Incorporated                     7,200         283
  Allergan Incorporated-Rights                183           0
  C.R. Bard, Inc.                           6,400         218
  Bausch & Lomb Inc.                        6,300         268
  Baxter International Inc.                30,300       1,432
  Becton, Dickinson & Company               7,100         570
 *Biomet, Inc.                             12,900         185
 *Boston Scientific Corp.                  19,900         895
  Johnson & Johnson                       148,700       7,361
 
<CAPTION>
                                                      MARKET
                                                      VALUE
                                         SHARES      (000'S)
                                       ----------    --------
<S>                                    <C>           <C>
HOSPITAL SUPPLIES (CONTINUED)
  Mallinckrodt Group                        8,300    $    323
  Medtronic, Incorporated                  26,100       1,462
  Millipore Corp.                           4,900         205
 *St. Jude Medical, Inc.                    8,900         298
  U.S. Surgical Corporation                 6,900         214
                                                     --------
      Total                                            17,529
                                                     --------
HOUSEHOLD FURNITURE (0.4%)
  Armstrong World Industries, Inc.          4,100         236
  Black & Decker Corporation                9,800         379
  Maytag Corporation                       11,700         244
  Newell Co.                               17,700         542
  Rubbermaid, Inc.                         16,900         461
  The Stanley Works                         9,900         295
                                                     --------
      Total                                             2,157
                                                     --------
INSURANCE (2.9%)
  Aetna Life & Casualty Company            12,900         922
  Allstate Corporation                     49,714       2,268
  American General Corporation             23,200         844
  American International Group, Inc.       52,850       5,212
  Aon Corporation                          12,100         614
  CIGNA Corporation                         8,500       1,002
  The Chubb Corporation                    19,600         978
  General Re Corporation                    9,100       1,385
  ITT Hartford Group Inc.                  13,100         698
  Jefferson-Pilot Corp.                     7,900         408
  Lincoln National Corporation             11,600         536
  Providian Corporation                    10,500         450
  SAFECO Corp.                             14,100         499
  St. Paul Companies, Inc.                  9,400         503
  Torchmark Corporation                     8,000         350
  UNUM Corporation                          8,200         510
  USF & G Corp.                            13,300         218
  USLIFE Corporation                        3,850         127
                                                     --------
      Total                                            17,524
                                                     --------
LEISURE RELATED (1.8%)
 *Bally Entertainment Corporation           5,600         154
  Brunswick Corporation                    11,000         220
  Comcast Corp.                            26,750         495
  Walt Disney Company                      75,669       4,758
  Fleetwood Enterprises, Inc.               5,100         158
  Hasbro Inc.                               9,700         347
 *King World Productions, Inc.              4,200         153
  Mattel, Inc.                             30,888         884
  Outboard Marine Corporation               2,100          38
 *Tele Communications, Inc.                72,900       1,321
 *U S West Media Group                     52,700         962
 *Viacom Incorporated                      41,256       1,568
                                                     --------
      Total                                            11,058
                                                     --------
</TABLE>
 
                                       49
<PAGE>   53
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                           INDEX 500 STOCK PORTFOLIO
                            SCHEDULE OF INVESTMENTS
                                 JUNE 30, 1996
<TABLE>
<CAPTION>
                                                      MARKET
                                                      VALUE
                                         SHARES      (000'S)
                                       ----------    --------
<S>                                    <C>           <C>
COMMON STOCK (CONTINUED)
MACHINERY (1.4%)
  Briggs & Stratton Corporation             3,200    $    132
  Case Corporation                          8,100         389
  Caterpillar Inc.                         21,600       1,463
  Cincinnati Milacron Inc.                  4,400         106
  Cooper Industries, Inc.                  12,100         502
  Crane Co.                                 3,400         139
  Cummins Engine Company, Inc.              4,500         182
  Deere & Company                          29,300       1,172
  Dover Corporation                        12,700         586
  Fluor Corporation                         9,300         608
  Foster Wheeler Corporation                4,500         202
  General Signal Corporation                5,500         208
  Giddings & Lewis Company                  3,900          63
  Harnischfeger Industries, Inc.            5,200         173
  Illinois Tool Works Inc.                 13,300         899
  Ingersoll-Rand Company                   12,200         534
  Johnson Controls, Inc.                    4,600         320
  Pall Corporation                         12,800         309
  Parker-Hannifin Corporation               8,250         350
  Timken Company                            3,500         136
  TRINOVA Corp.                             3,200         107
 *Varity Corporation                        4,400         212
                                                     --------
      Total                                             8,792
                                                     --------
MEDICAL SERVICES (1.0%)
 *Beverly Enterprises, Inc.                11,200         134
  Columbia/HCA Healthcare Corporation      50,000       2,669
 *Community Psychiatric Centers             5,000          47
  Humana, Inc.                             18,100         324
  Manor Care, Inc.                          7,000         276
 *Tenet Healthcare Corp.                   24,000         513
  United Healthcare Corp.                  20,300       1,025
  U.S. HealthCare Incorporated             17,200         946
                                                     --------
      Total                                             5,934
                                                     --------
METALS & MINING (1.2%)
  Alcan Aluminum Limited                   25,200         769
  Aluminum Co. of America                  19,600       1,124
  ASARCO, Inc.                              4,800         133
  Barrick Gold Corporation                 39,900       1,082
  Cyprus Amax Minerals Co.                 10,350         234
  Echo Bay Mines Limited Co.               14,600         157
  Freeport-McMoRan Copper & Gold Inc.      21,800         695
  Homestake Mining Company                 16,400         281
  Inco Limited                             13,100         422
  Newmont Mining Corporation               11,088         547
  Phelps Dodge Corporation                  7,400         462
  Placer Dome Incorporated                 26,700         637
  Reynolds Metals Company                   7,100         370
  Santa Fe Pacific Gold Corp.              14,660         207
                                                     --------
      Total                                             7,120
                                                     --------
OFFICE EQUIPMENT-SERVICES (2.8%)
  Autodesk, Inc.                            5,100         152
  Automatic Data Processing, Inc.          32,300       1,248
  Computer Associates International
    Inc.                                   27,050       1,927
 *Computer Sciences Corp.                   6,300         471
  First Data Corporation                   24,900       1,983
 
<CAPTION>
                                                      MARKET
                                                      VALUE
                                         SHARES      (000'S)
                                       ----------    --------
<S>                                    <C>           <C>
OFFICE EQUIPMENT-SERVICES (CONTINUED)
 *Microsoft Corporation                    66,300    $  7,964
 *Novell, Inc.                             40,800         566
 *Oracle Corporation                       73,000       2,879
  Shared Medical Systems Corp.              2,600         167
                                                     --------
      Total                                            17,357
                                                     --------
OIL & GAS-DOMESTIC (1.3%)
  Amerada Hess Corporation                 10,400         558
  Ashland Oil, Inc.                         7,100         281
  Atlantic Richfield Company               18,000       2,133
  Coastal Corp.                            11,800         493
  Kerr-McGee Corporation                    5,600         341
  Louisiana Land & Exploration Co.          3,800         219
  Occidental Petroleum Corporation         35,600         881
 *Oryx Energy Company                      11,700         190
  Pennzoil Company                          5,200         240
  Phillips Petroleum Company               29,300       1,227
 *Santa Fe Energy Resources, Inc.          10,100         120
  Sun Company, Inc.                         8,200         249
  USX-U S Steel Group Inc.                  9,300         264
  Unocal Corp.                             27,600         932
                                                     --------
      Total                                             8,128
                                                     --------
OIL & GAS-INTERNATIONAL (6.1%)
  Amoco Company                            55,400       4,010
  Chevron Corp.                            72,800       4,295
  Exxon Corporation                       138,600      12,041
  Mobil Corporation                        44,000       4,933
  Royal Dutch Petroleum Co., ADR           59,800       9,194
  Texaco Inc.                              29,500       2,474
                                                     --------
      Total                                            36,947
                                                     --------
OIL FIELD SERVICES (0.8%)
  Baker Hughes, Inc.                       15,900         523
  Dresser Industries, Inc.                 20,300         599
  Halliburton Company                      12,800         710
  Helmerich & Payne, Inc.                   2,800         103
  McDermott International, Inc.             6,100         127
 *Rowan Companies, Inc.                     9,500         140
  Schlumberger Limited                     27,100       2,283
 *Western Atlas International Inc.          5,900         344
                                                     --------
      Total                                             4,829
                                                     --------
PAPER (0.9%)
  International Paper Company              33,300       1,228
  James River Corp. of Virginia             9,500         251
  Kimberly-Clark Corporation               31,422       2,427
  Mead Corp.                                5,900         306
  Stone Container Corporation              11,100         153
  Temple-Inland Inc.                        6,200         290
  Union Camp Corporation                    7,700         375
  Westvaco Corporation                     11,350         339
  Willamette Industries Inc.                6,200         369
                                                     --------
      Total                                             5,738
                                                     --------
PHOTO & OPTICAL (0.5%)
  Eastman Kodak Company                    38,600       3,001
  Polaroid Corporation                      5,100         233
                                                     --------
      Total                                             3,234
                                                     --------
</TABLE>
 
                                       50
<PAGE>   54
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                           INDEX 500 STOCK PORTFOLIO
                            SCHEDULE OF INVESTMENTS
                                 JUNE 30, 1996
<TABLE>
<CAPTION>
                                                      MARKET
                                                      VALUE
                                         SHARES      (000'S)
                                       ----------    --------
<S>                                    <C>           <C>
COMMON STOCK (CONTINUED)
PRINTING & PUBLISHING (1.4%)
  American Greetings Corp.                  8,300    $    227
  Deluxe Corp.                              9,200         327
  R.R. Donnelley & Sons Company            17,200         600
  Dow Jones & Company, Inc.                10,900         455
  Dun & Bradstreet Corporation             19,000       1,187
  Gannett Company, Inc.                    15,700       1,111
  Harcourt General                          7,900         395
  The John H. Harland Company               3,400          84
  Jostens, Inc.                             4,300          85
  Knight-Ridder Inc.                        5,500         399
  Mcgraw-Hill Companies, Inc.              11,200         512
  Meredith Corporation                      3,100         129
  New York Times Company                   10,900         356
  Time Warner Inc.                         43,800       1,719
  Times Mirror Company                     11,700         509
  Tribune Company                           6,900         501
                                                     --------
      Total                                             8,596
                                                     --------
PROFESSIONAL SERVICES (0.5%)
 *Alza Corp.                                9,400         257
  H & R Block, Inc.                        11,500         375
 *CUC International Inc.                  21,250         754
  Ecolab, Inc.                               7,200         238
  Interpublic Group of Cos., Inc.           8,800         412
  National Service Industries, Inc.         5,400         211
  Ogden Corporation                         5,500         100
  Safety-Kleen Corp.                        6,500         114
  Service Corporation International        13,100         753
                                                     --------
      Total                                             3,214
                                                     --------
RAILROADS (1.0%)
  Burlington Northern Santa Fe             17,007       1,375
  CSX Corporation                          23,600       1,139
  Conrail Incorporated                      8,700         577
  Norfolk Southern Corporation             14,200       1,203
  Union Pacific Corporation                22,900       1,600
                                                     --------
      Total                                             5,894
                                                     --------
RETAIL-FOOD (0.7%)
  Albertson's, Inc.                        28,100       1,163
  American Stores Co.                      16,700         689
  Fleming Companies, Inc.                   4,000          58
  Giant Food Inc.                           6,700         240
  Great Atlantic & Pacific Tea Co.,
    Inc.                                    4,300         141
 *The Kroger Company                       13,900         549
  Supervalue Inc.                           7,500         236
  Sysco Corporation                        20,300         695
  Winn-Dixie Stores, Inc.                  17,000         601
                                                     --------
      Total                                             4,372
                                                     --------
RETAIL-GENERAL (4.0%)
 *Charming Shoppes Incorporated            11,500          81
  Circuit City Stores, Inc.                10,900         394
  Dayton Hudson Corporation                 8,000         825
  Dillard Department Stores, Inc.          12,600         460
 *Federated Department Stores, Inc.        23,200         792
  The Gap, Inc.                            32,200       1,034
  Home Depot, Inc.                         53,299       2,878
  K Mart Corporation                       53,600         663
  The Limited Inc.                         30,200         649
  Longs Drug Stores Corp.                   2,200    $     98
 
<CAPTION>
                                                      MARKET
                                                      VALUE
                                         SHARES      (000'S)
                                       ----------    --------
<S>                                    <C>           <C>
RETAIL-GENERAL (CONTINUED)
  Lowe's Companies, Inc.                   18,000         650
  May Department Stores Company            27,900       1,221
  Melville Corporation                     11,700         474
  Mercantile Stores Company                 4,100         240
  Nordstrom, Inc.                           9,100         405
  J.C. Penney Company, Inc.                25,100       1,318
  Pep Boys - Manny, Moe & Jack              6,900         235
 *Price/Costco Inc.                        21,807         472
  Rite Aid Corporation                      9,300         277
  Sears, Roebuck & Company                 43,800       2,130
  The TJX Companies, Inc.                   8,100         273
  Tandy Corporation                         6,700         317
 *Toys "R" Us                              30,500         869
  Wal-Mart Stores, Inc.                   256,000       6,496
  Walgreen Company                         27,500         921
 *Woolworth Corp.                          14,900         335
                                                     --------
      Total                                            24,507
                                                     --------
SOAPS & TOILETRIES (2.2%)
  Alberto-Culver Company                    3,100         144
  Avon Products, Inc.                      15,000         677
  Clorox Company                            5,800         514
  Colgate-Palmolive Co.                    16,300       1,381
  Gillette Company                         49,700       3,100
  International Flavors & Fragrances,
    Inc.                                   12,400         591
  Procter & Gamble Company                 76,600       6,942
                                                     --------
      Total                                            13,349
                                                     --------
STEEL (0.3%)
 *Armco Inc.                               11,800          59
 *Bethlehem Steel Corporation              12,400         147
  Inland Steel Industries, Inc.             5,400         106
  Nucor Corp.                               9,800         496
  USX-Marathon Group                       32,100         646
  Worthington Industries, Inc.             10,150         212
                                                     --------
      Total                                             1,666
                                                     --------
TELECOMMUNICATIONS (5.0%)
  AT&T Corporation                        179,400      11,123
 *Airtouch Communications                  55,700       1,573
 *Andrew Corporation                        6,727         362
 *Bay Networks                             21,000         541
 *Cabletron Systems Inc.                    8,100         556
 *Cisco Systems Incorporated               63,500       3,596
 *DSC Communications Corp.                 12,900         389
  MCI Communications Corporation           77,100       1,976
  Motorola, Inc.                           66,100       4,156
  Northern Telecom Limited                 28,700       1,561
  Scientific-Atlanta, Inc.                  8,500         132
  Sprint Corporation                       48,700       2,045
 *Tellabs Inc.                              9,900         662
 *3COM Corp.                               18,600         851
 *World Communications Inc.                21,700       1,202
                                                     --------
      Total                                            30,725
                                                     --------
TOBACCO (1.9%)
  American Brands, Inc.                    19,800         898
  Philip Morris Companies, Inc.            92,600       9,630
  UST Incorporated                         22,600         774
                                                     --------
      Total                                            11,302
                                                     --------
</TABLE>
 
                                       51
<PAGE>   55
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                           INDEX 500 STOCK PORTFOLIO
                            SCHEDULE OF INVESTMENTS
                                 JUNE 30, 1996
<TABLE>
<CAPTION>
                                                      MARKET
                                                      VALUE
                                         SHARES      (000'S)
                                       ----------    --------
<S>                                    <C>           <C>
COMMON STOCK (CONTINUED)
TRUCKING-SHIPPING (0.2%)
  Caliber System Inc.                       4,400    $    150
  Consolidated Freightways, Inc.            4,900         104
 *Federal Express Corp.                     6,300         517
  Ryder System, Inc.                        8,900         250
 *Yellow Corp.                              2,900          38
                                                     --------
      Total                                             1,059
                                                     --------
UTILITY-ELECTRIC (3.1%)
  American Electric Power Co., Inc.        20,800         887
  Baltimore Gas & Electric Company         16,500         468
  Carolina Power & Light Company           17,000         646
  Central & South West Corporation         23,400         679
  Cinergy Corporation                      17,617         564
  Consolidated Edison Co. of New York      26,200         766
  DTE Energy Company                       16,200         500
  Dominion Resources Inc.                  19,800         792
  Duke Power Company                       22,900       1,174
  Edison International                     49,700         876
  Entergy Corporation                      25,400         721
  FPL Group, Inc.                          20,500         943
  General Public Utilities                 13,400         472
  Houston Industries Incorporated          29,300         722
 *Niagara Mohawk Power Corporation         16,100         125
  Northern States Power Company             7,600         375
  Ohio Edison Company                      17,000         372
  PECO Energy Company                      24,800         645
  P P & L Resources Inc.                   17,800         421
  Pacific Enterprises                       9,200         273
  Pacific Gas & Electric Company           46,500       1,081
  PacifiCorp                               32,800         730
  Public Service Enterprise Group,
    Inc.                                   27,300         747
  Southern Company                         74,900       1,844
  Texas Utilities Company                  25,200       1,077
  UNICOM Corp.                             24,000         669
  Union Electric Company                   11,400         459
                                                     --------
      Total                                            19,028
                                                     --------
UTILITY-GAS (0.5%)
  Columbia Gas System Inc.                  6,100         318
  Consolidated Natural Gas Company         10,400         543
  Enron Corp.                              28,000       1,144
  Nicor Inc.                                5,600         159
  Noram Energy Corporation                 15,000         163
  ONEOK, Inc.                               3,000          75
  Peoples Energy Corporation                3,900         131
 
<CAPTION>
                                                      MARKET
                                        SHARES/       VALUE
                                          PAR        (000'S)
                                       ----------    --------
<S>                                    <C>           <C>
UTILITY-GAS (CONTINUED)
  Williams Companies Inc.                  11,700    $    579
                                                     --------
      Total                                             3,112
                                                     --------
UTILITY-TELEPHONE (4.3%)
  ALLTEL Corporation                       21,100         649
  Ameritech Corporation                    62,000       3,681
  Bell Atlantic Corporation                48,900       3,117
  Bellsouth Corporation                   111,000       4,704
  GTE Corporation                         108,900       4,873
  NYNEX Corp.                              48,800       2,318
  Pacific Telesis Group                    47,800       1,613
  SBC Communications Incorporate           68,000       3,349
  U S West Inc.                            52,900       1,686
                                                     --------
      Total                                            25,990
                                                     --------
      Total Common Stock                              565,267
                                                     --------
PREFERRED STOCK (0.0%)
DIVERSIFIED (0.0%)
  Teledyne, Inc.                              265    $      4
                                                     --------
      Total Preferred Stock                                 4
                                                     --------
MONEY MARKET INVESTMENTS (7.3%)
AUTO (1.7%)
  +Ford Motor Credit Company, 5.29%,
    7/10/96                            $4,000,000    $  3,994
  +Ford Motor Credit Company, 5.45%,
    7/3/96                              6,200,000       6,196
                                                     --------
      Total                                            10,190
                                                     --------
DRUGS (1.6%)
  +SmithKline Beecham Corp., 5.37%,
    7/31/96                            10,000,000       9,952
                                                     --------
FEDERAL GOVERNMENT & AGENCIES (0.7%)
  +U.S. Treasury, 4.99%, 8/22/96        4,500,000       4,464
                                                     --------
FINANCIAL SERVICES (0.3%)
  +General Electric Capital
    Corporation, 5.34%, 7/3/96          2,100,000       2,099
                                                     --------
TELECOMMUNICATIONS (3.0%)
  +U. S. West Communications Group,
    5.35%, 7/16/96                     18,000,000      17,955
                                                     --------
      Total Money Market Investments                   44,660
                                                     --------
      Total Investments                              $609,931
                                                     ========
</TABLE>
 
* Non-Income Producing
 
+ Partially or fully held by the custodian in a segregated account as collateral
  for open financial futures contracts. Information regarding open future
  contracts as of June 30, 1996 is summarized below:
 
<TABLE>
<CAPTION>
                                                            UNREALIZED
                          NUMBER OF       EXPIRATION       APPRECIATION
         ISSUER           CONTRACTS          DATE            (000'S)
  --------------------    ---------     --------------     ------------
  <S>                     <C>           <C>                <C>
  S&P 500 Stock Index        131        September 1996         $895
</TABLE>
 
    The Accompanying Notes are an Integral Part of the Financial Statements
                       (Prepared from Unaudited Figures)
 
                                       52
<PAGE>   56
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                             GROWTH STOCK PORTFOLIO
                            SCHEDULE OF INVESTMENTS
                                 JUNE 30, 1996
<TABLE>
<CAPTION>
                                                      MARKET
                                                      VALUE
                                         SHARES      (000'S)
                                       ----------    --------
<S>                                    <C>           <C>
COMMON STOCK (93.5%)
AEROSPACE (1.4%)
  Boeing Company                           20,500    $  1,786
                                                     --------
AIRLINES (1.7%)
 *AMR Corporation                          11,000       1,001
 *Midwest Express Holdings, Inc.           37,000       1,189
                                                     --------
      Total                                             2,190
                                                     --------
AUTO & TRUCKS (1.5%)
  Chrysler Corporation                     10,800         670
  Harley Davidson Inc.                     29,000       1,193
                                                     --------
      Total                                             1,863
                                                     --------
AUTO RELATED (1.5%)
  Echlin Inc.                              34,300       1,299
  Magna International Inc.                 12,200         561
                                                     --------
      Total                                             1,860
                                                     --------
BANKS (4.3%)
  BankAmerica Corporation                  17,600       1,333
  Chase Manhattan Corporation              23,340       1,648
  Citicorp                                 14,400       1,190
  First Union Corporation                  19,700       1,199
                                                     --------
      Total                                             5,370
                                                     --------
BEVERAGES (2.5%)
  Coca-Cola Company                        17,200         841
  Pepsico Inc.                             65,000       2,299
                                                     --------
      Total                                             3,140
                                                     --------
BUILDING & CONSTRUCTION (0.7%)
  PPG Industries Inc.                      19,000         926
                                                     --------
CHEMICALS (2.3%)
  E.I. du Pont de Nemours & Co.            10,150         803
  Ecolab, Inc.                             26,000         858
  Union Carbide Corporation                30,000       1,193
                                                     --------
      Total                                             2,854
                                                     --------
CHEMICALS-SPECIALTY (0.9%)
  Avery Dennison Corp.                     20,000       1,098
                                                     --------
DIVERSIFIED (1.2%)
  Allied Signal Inc.                       26,100       1,491
                                                     --------
DRUGS (3.2%)
  Eli Lilly & Company                      22,600       1,469
  Merck & Co., Inc.                        21,900       1,415
  Pfizer Inc.                              15,400       1,099
                                                     --------
      Total                                             3,983
                                                     --------
ELECTRICAL EQUIPMENT (4.4%)
  Emerson Electric Co.                     17,000       1,536
  General Electric Company                 31,900       2,759
  W.W. Grainger, Inc.                      16,600       1,287
                                                     --------
      Total                                             5,582
                                                     --------
ELECTRONICS (3.4%)
  EG & G, Inc.                             34,700         742
  Hewlett-Packard Company                  15,000       1,494
  Intel Corp.                              15,400       1,131
  Molex Inc.                               29,408         864
                                                     --------
      Total                                             4,231
                                                     --------
ENVIRONMENTAL CONTROL (0.4%)
  Nalco Chemical Company                   17,000         536
                                                     --------
 
<CAPTION>
                                                      MARKET
                                                      VALUE
                                         SHARES      (000'S)
                                       ----------    --------
<S>                                    <C>           <C>
FINANCE COMPANIES (1.3%)
 *Associates First Capital
    Corporation                            45,000    $  1,693
                                                     --------
FINANCIAL SERVICES (5.5%)
  AT&T Corporation                         27,800       1,724
  Dean Witter, Discover & Co.               8,000         458
  Donaldson, Lufkin & Jenrette             30,000         930
  Electronic Data Systems Corp.            31,800       1,709
  Franklin Resources                       19,400       1,183
  Merrill Lynch & Co.                      14,000         912
                                                     --------
      Total                                             6,916
                                                     --------
FOOD SERVICE/LODGING (2.6%)
 *Harrahs Entertainment                     9,800         277
  McDonald's Corporation                   34,400       1,608
 *Promus Hotels                            45,000       1,333
                                                     --------
      Total                                             3,218
                                                     --------
FOODS (3.3%)
  CPC International Corp.                  18,900       1,361
  Campbell Soup Company                    21,100       1,488
  General Mills, Inc.                      24,300       1,324
                                                     --------
      Total                                             4,173
                                                     --------
HEALTH CARE SERVICES (2.1%)
  Columbia/HCA Healthcare Corp.            22,400       1,196
  United Healthcare Corp.                  29,100       1,470
                                                     --------
      Total                                             2,666
                                                     --------
HOSPITAL SUPPLIES (2.7%)
  Guidant Corp.                            31,000       1,527
  Johnson & Johnson                        38,200       1,891
                                                     --------
      Total                                             3,418
                                                     --------
HOUSEWARES (2.5%)
  First Brands Corporation                 66,000       1,782
  Newell Co.                               44,200       1,354
                                                     --------
      Total                                             3,136
                                                     --------
INSURANCE (3.1%)
  CIGNA Corporation                        11,300       1,332
  Everest Reinsurance Holdings Inc.        57,000       1,475
  Progressive Corp.                        24,000       1,110
                                                     --------
      Total                                             3,917
                                                     --------
LEISURE RELATED (2.4%)
  Walt Disney Company                      22,600       1,421
  Mattel, Inc.                             55,281       1,582
                                                     --------
      Total                                             3,003
                                                     --------
MACHINERY (1.1%)
  Deere & Company                          16,600         664
  Ingersoll-Rand Company                   15,700         687
                                                     --------
      Total                                             1,351
                                                     --------
MEDIA (1.8%)
 *U S West Media Group                     25,500         465
 *United States Satellite Broadcast        48,000       1,812
                                                     --------
      Total                                             2,277
                                                     --------
METALS & MINING (0.9%)
  AK Steel Holding Corporation             30,000       1,174
                                                     --------
</TABLE>
 
                                       53
<PAGE>   57
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                             GROWTH STOCK PORTFOLIO
                            SCHEDULE OF INVESTMENTS
                                 JUNE 30, 1996
<TABLE>
<CAPTION>
                                                      MARKET
                                                      VALUE
                                         SHARES      (000'S)
                                       ----------    --------
<S>                                    <C>           <C>
COMMON STOCK (CONTINUED)
NATURAL GAS (1.00%)
  Sonat Inc.                               28,000    $  1,260
                                                     --------
OFFICE EQUIPMENT (1.3%)
  International Business Machines
    Corp.                                  16,200       1,604
                                                     --------
OFFICE EQUIPMENT-SERVICES (3.8%)
  Alco Standard Corporation                18,800         850
  First Data Corporation                   21,300       1,696
 *Microsoft Corporation                    10,000       1,201
 *Office Max, Inc.                         43,600       1,041
                                                     --------
      Total                                             4,788
                                                     --------
OIL & GAS-DOMESTIC (1.5%)
  Ashland Inc.                              9,100         361
  Tosco Corporation                         5,000         251
  Unocal Corp.                             37,700       1,272
                                                     --------
      Total                                             1,884
                                                     --------
OIL & GAS-INTERNATIONAL (4.8%)
  Amoco Company                            15,600       1,129
  British Petroleum Co Ltd                 13,600       1,454
  Exxon Corporation                        13,200       1,147
  Mobil Corporation                        12,400       1,390
  Texaco Inc.                              10,800         906
                                                     --------
      Total                                             6,026
                                                     --------
PAPER (0.4%)
  International Paper Company              14,000         515
                                                     --------
PRINTING & PUBLISHING (3.2%)
  McGraw-Hill Companies Inc.               26,200       1,199
 *Scholastic Corp.                         30,300       1,879
  Tribune Company                          13,800       1,002
                                                     --------
      Total                                             4,080
                                                     --------
RAILROADS (1.8%)
 +Canadian National Railway Co.            95,500       2,316
                                                     --------
RETAIL-FOOD (0.9%)
  Albertson's, Inc.                        27,800       1,149
                                                     --------
RETAIL-GENERAL (7.0%)
 *DST Systems, Inc.                        50,000       1,600
  Dayton Hudson Corporation                 5,600         578
 *Federated Department Stores              36,000       1,229
  Home Depot, Inc.                         27,200       1,469
 *Kohls Department Stores                  40,000       1,465
  J.C. Penney Company, Inc.                13,100         688
  Walmart Stores Inc.                      15,200         386
 
<CAPTION>
                                                      MARKET
                                        SHARES/       VALUE
                                          PAR        (000'S)
                                       ----------    --------
<S>                                    <C>           <C>
RETAIL-GENERAL (CONTINUED)
  Walgreen Company                         40,200    $  1,347
                                                     --------
      Total                                             8,762
                                                     --------
SOAPS & TOILETRIES (2.1%)
  Gillette Company                         14,000         873
  Procter & Gamble Company                 20,200       1,831
                                                     --------
      Total                                             2,704
                                                     --------
TELECOMMUNICATIONS (2.7%)
  Frontier Corp.                           48,100       1,473
 *WorldCom Inc.                            34,400       1,905
                                                     --------
      Total                                             3,378
                                                     --------
TOBACCO (1.2%)
  Philip Morris Companies                  14,800       1,538
                                                     --------
UTILITY-ELECTRIC (1.7%)
  Duke Power Company                       22,900       1,174
  FPL Group, Inc.                          20,500         943
  Southern Company                          3,500          86
                                                     --------
      Total                                             2,203
                                                     --------
UTILITY-TELEPHONE (1.4%)
  Ameritech Corporation                    15,200         903
  GTE Corporation                          19,600         877
                                                     --------
      Total                                             1,780
                                                     --------
      Total Common Stock                              117,839
                                                     --------
MONEY MARKET INVESTMENTS (6.5%)
DRUGS (1.7%)
  SmithKline Beecham Corp.,
    5.37%, 7/31/96                     $2,200,000    $  2,189
                                                     --------
FINANCE COMPANIES (1.6%)
++Ford Motor Credit Company,
    5.29%, 7/10/96                      2,000,000       1,997
                                                     --------
FINANCIAL SERVICES (3.2%)
  BAT Capital Corporation,
    5.35%, 7/15/96                      2,000,000       1,995
  General Electric Capital
    Corporation, 5.34%, 7/3/96          1,200,000       1,199
  Philip Morris Capital Corp.,
    5.3%, 7/3/96                          800,000         800
                                                     --------
      Total                                             3,994
                                                     --------
      Total Money Market Investments                    8,180
                                                     --------
      Total Investments                              $126,019
                                                     ========
</TABLE>
 
 * Non-Income Producing
 
 + Installment payment security initially purchased November 16, 1995, for which
   the Portfolio has paid $1,200,000 as of June 30, 1996. The Portfolio will
   make the final installment payment of approximately $800,000 on November 29,
   1996.
 
++ $800,000 is segregated as collateral for future payment of the installment
   payment security.
 
    The Accompanying Notes are an Integral Part of the Financial Statements
                       (Prepared from Unaudited Figures)
 
                                       54
<PAGE>   58
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                       GROWTH AND INCOME STOCK PORTFOLIO
                            SCHEDULE OF INVESTMENTS
                                 JUNE 30, 1996
<TABLE>
<CAPTION>
                                                      MARKET
                                                      VALUE
                                        SHARES       (000'S)
                                      ----------     --------
<S>                                   <C>            <C>
COMMON STOCK (96.3%)
AEROSPACE (2.9%)
  Boeing Company                          51,300     $  4,469
  Sundstrand Corp.                        23,900          875
                                                     --------
      Total                                             5,344
                                                     --------
APPAREL TEXTILE (0.5%)
 *Fruit of the Loom Incorporated          32,600          831
                                                     --------
AUTO & TRUCKS (1.4%)
  General Motors Corporation              47,300        2,477
                                                     --------
AUTO RELATED (1.1%)
  Cooper Tire & Rubber Company            86,700        1,929
                                                     --------
BANKS (6.6%)
  BankAmerica Corporation                 18,100        1,371
  Citicorp                                23,300        1,925
  First Union Corporation                 14,300          871
 *First USA Incorporated                  15,600          858
  Firstar Corporation                     25,900        1,195
  Fleet Financial Group Inc.              19,900          866
  NationsBank Corp.                       39,500        3,264
  P P & L Logic                           35,300          834
  Standard Federal Bancorp                24,700          951
                                                     --------
      Total                                            12,135
                                                     --------
BEVERAGES (2.0%)
  Pepsico Inc.                           104,400        3,693
                                                     --------
BUILDING & CONSTRUCTION (0.6%)
 *USG Corporation                         39,400        1,098
                                                     --------
CHEMICALS (3.8%)
  Albemarle Corporation                  100,000        1,825
  E.I. du Pont de Nemours & Co.           39,500        3,125
  Union Carbide Corporation               51,000        2,027
                                                     --------
      Total                                             6,977
                                                     --------
CHEMICALS-SPECIALITY (1.0%)
  Sigma-Aldrich Corp.                     16,600          888
  Wellman Inc.                            37,300          872
                                                     --------
      Total                                             1,760
                                                     --------
COAL, GAS AND PIPELINE (0.6%)
  Anadarko Petroleum Corp.                20,400        1,183
                                                     --------
DIVERSIFIED (3.9%)
  Allied Signal Inc.                      45,800        2,616
 *Coltec Industries Inc.                  70,500        1,005
  ITT Hartford Group                      34,500        1,837
  Teledyne, Inc.                          48,100        1,738
                                                     --------
      Total                                             7,196
                                                     --------
DRUGS (5.0%)
 *Forest Laboratories Inc.                66,100        2,553
  Pfizer Inc.                             42,200        3,012
  Warner-Lambert Company                  64,200        3,531
                                                     --------
      Total                                             9,096
                                                     --------
ELECTRICAL EQUIPMENT (1.8%)
  General Electric Company                11,200          969
  W.W. Grainger, Inc.                     31,700        2,457
                                                     --------
      Total                                             3,426
                                                     --------
 
<CAPTION>
                                                      MARKET
                                                      VALUE
                                        SHARES       (000'S)
                                      ----------     --------
<S>                                   <C>            <C>
ELECTRONICS (5.6%)
  Advanced Micro Devices, Inc.            41,800     $    570
  Duracell International Inc.             11,200          483
 *EMC Corporation                         93,000        1,732
 *General Instrument Corp.                79,400        2,293
  Hewlett-Packard Company                 16,800        1,674
  Perkin-Elmer Corporation                16,100          777
 *SoftKey International Inc.              38,800          735
  Tyco Laboratories, Inc.                 47,700        1,944
                                                     --------
      Total                                            10,208
                                                     --------
ENVIRONMENTAL CONTROL (1.9%)
  Johnson Controls Inc.                   22,700        1,578
  WMX Technologies, Inc.                  60,400        1,978
                                                     --------
      Total                                             3,556
                                                     --------
FEDERAL GOVERNMENT AGENCY RELATED (0.6%)
  Federal National Mortgage Assoc.        33,700        1,129
                                                     --------
FINANCIAL SERVICES (4.6%)
  AT&T Corporation                        61,100        3,788
  H.F. Ahmanson & Company                 62,000        1,674
  Dean Witter, Discover & Co.             36,600        2,095
  Great Western Financial Corp.           35,900          857
                                                     --------
      Total                                             8,414
                                                     --------
FOODS (1.9%)
  CPC International Corp.                 12,900          929
  Ralston Purina Group                    25,100        1,610
  Unilever, N.V.                           6,300          914
                                                     --------
      Total                                             3,453
                                                     --------
HEALTH CARE SERVICES (1.7%)
  Columbia/HCA Healthcare Corp.           56,500        3,016
                                                     --------
HOSPITAL SUPPLIES (1.9%)
 *Healthcare Retirement Corp.             64,350        1,528
 *Humana, Inc.                           111,500        1,993
                                                     --------
      Total                                             3,521
                                                     --------
INSURANCE (2.3%)
  AMBAC, Inc.                             24,400        1,272
  MBIA Incorporated                        4,500          350
  Providian Corporation                   59,000        2,530
                                                     --------
      Total                                             4,152
                                                     --------
LEISURE RELATED (1.4%)
  International Game Technology          100,900        1,703
 *Viacom Incorporated                     20,700          787
                                                     --------
      Total                                             2,490
                                                     --------
MACHINERY (1.5%)
 *Cooper Cameron Corp.                    16,760          733
  Cooper Industries, Inc.                 49,062        2,036
                                                     --------
      Total                                             2,769
                                                     --------
MEDIA (2.7%)
 *Tele-Communications, Inc.              179,200        3,248
  Turner Broadcasting System Inc.         64,500        1,774
                                                     --------
      Total                                             5,022
                                                     --------
METALS & MINING (1.5%)
  Aluminum Co. of America                 48,600        2,788
                                                     --------
</TABLE>
 
                                       55
<PAGE>   59
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                       GROWTH AND INCOME STOCK PORTFOLIO
                            SCHEDULE OF INVESTMENTS
                                 JUNE 30, 1996
<TABLE>
<CAPTION>
                                                      MARKET
                                                      VALUE
                                        SHARES       (000'S)
                                      ----------     --------
<S>                                   <C>            <C>
COMMON STOCK (CONTINUED)
OFFICE EQUIPMENT (0.7%)
 *Quantum Corp.                           84,600     $  1,237
                                                     --------
OFFICE EQUIPMENT-SERVICES (1.8%)
  Adobe Systems Incorporated              20,600          739
  Autodesk, Inc.                          23,500          702
 *Cisco Systems Incorporated              33,200        1,880
                                                     --------
      Total                                             3,321
                                                     --------
OIL & GAS-DOMESTIC (2.7%)
  Ashland Inc.                            51,100        2,025
  Sun Company, Inc.                       44,400        1,349
  Unocal Corp.                            45,000        1,519
                                                     --------
      Total                                             4,893
                                                     --------
OIL & GAS-INTERNATIONAL (5.6%)
  Chevron Corp.                           38,900        2,295
  Exxon Corporation                       21,200        1,842
  Royal Dutch Petroleum Co., ADR          23,300        3,582
  Texaco Inc.                             30,300        2,541
                                                     --------
      Total                                            10,260
                                                     --------
PAPER (0.9%)
  Mead Corp.                              31,500        1,634
                                                     --------
PHOTO & OPTICAL (0.8%)
  Bausch & Lomb Inc.                      36,400        1,547
                                                     --------
PRINTING & PUBLISHING (0.5%)
  Time Warner Inc.                        24,700          968
                                                     --------
PROFESSIONAL SERVICES (2.5%)
 *Alza Corp.                              47,600        1,303
  Service Corporation International       60,100        3,456
                                                     --------
      Total                                             4,759
                                                     --------
RAILROADS (2.4%)
  Union Pacific Corporation               61,800        4,318
                                                     --------
RETAIL-GENERAL (5.1%)
  Circuit City Stores, Inc.               28,500        1,030
 *Federated Department Stores,
    Inc.                                  26,100          891
  Melville Corporation                    30,100        1,219
 *Toys "R" Us                            108,100        3,081
  Wal-Mart Stores Inc.                   124,900        3,169
                                                     --------
      Total                                             9,390
                                                     --------
SOAPS & TOILETRIES (3.5%)
  Colgate-Palmolive Co.                   21,300        1,805
  Procter & Gamble Company                51,400        4,658
                                                     --------
      Total                                             6,463
                                                     --------
 
<CAPTION>
                                                      MARKET
                                       SHARES/        VALUE
                                         PAR         (000'S)
                                      ----------     --------
<S>                                   <C>            <C>
TELECOMMUNICATIONS (1.9%)
  MCI Communications Corporation          76,400     $  1,958
  Motorola, Inc.                          25,000        1,572
                                                     --------
      Total                                             3,530
                                                     --------
TOBACCO (3.5%)
  Philip Morris Companies, Inc.           61,100        6,354
                                                     --------
TRUCKING-SHIPPING (0.9%)
  Consolidated Freightways, Inc.          79,100        1,671
                                                     --------
UTILITY-ELECTRIC (1.9%)
  Allegheny Power System Inc.             29,600          914
  FPL Group, Inc.                         18,600          856
  Houston Industries Incorporated         37,800          931
  Pacific Gas & Electric Co.              32,000          744
                                                     --------
      Total                                             3,445
                                                     --------
UTILITY-TELEPHONE (2.8%)
  Ameritech Corporation                   25,200        1,496
  Bellsouth Corporation                   31,400        1,331
  GTE Corporation                         27,700        1,240
  SBC Communications Incorporated         23,600        1,162
  U S West Inc.                           37,600        1,198
                                                     --------
      Total                                             6,427
                                                     --------
      Total Common Stock                              177,880
                                                     --------
MONEY MARKET INVESTMENTS (3.7%)
DRUGS (0.9%)
  SmithKline Beecham Corp.,
    5.37%, 7/31/96                    $1,700,000     $  1,692
                                                     --------
FINANCE COMPANIES (0.8%)
  Ford Motor Credit Company,
    5.29%, 7/10/96                     1,500,000        1,497
                                                     --------
FINANCIAL SERVICES (1.7%)
  BAT Capital Corporation,
    5.35%, 7/15/96                     1,300,000        1,297
  General Electric Capital
    Corporation,
    5.34%, 7/3/96                      1,700,000        1,699
                                                     --------
      Total                                             2,996
                                                     --------
FOODS (0.3%)
  Nestle Capital Corp., 5.52%,
    7/1/96                               600,000          600
                                                     --------
      Total Money Market
         Investments                                    6,785
                                                     --------
      Total Investments                              $184,665
                                                     ========
</TABLE>
 
* Non-Income Producing
 
    The Accompanying Notes are an Integral Part of the Financial Statements
                       (Prepared from Unaudited Figures)
 
                                       56
<PAGE>   60
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                       AGGRESSIVE GROWTH STOCK PORTFOLIO
                            SCHEDULE OF INVESTMENTS
                                 JUNE 30, 1996
<TABLE>
<CAPTION>
                                                     MARKET
                                                     VALUE
                                        SHARES      (000'S)
                                      -----------   --------
<S>                                   <C>           <C>
COMMON STOCK (93.3%)
AIRLINES (1.1%)
  Atlas Air, Inc.                         147,500   $  8,481
                                                    --------
AUTO RELATED (1.0%)
 *Custom Chrome Inc.                      142,300      3,824
 *Tower Automotive, Inc.                  152,300      3,731
                                                    --------
      Total                                            7,555
                                                    --------
BANKS (0.2%)
 *Texas Regional Bancshares Inc.           75,000      1,875
                                                    --------
BEVERAGES (1.0%)
 *Robert Mondavi Corporation              261,200      8,228
                                                    --------
BUILDING & CONSTRUCTION (1.0%)
 *NCI Building Systems                    221,800      7,486
                                                    --------
CHEMICALS-SPECIALITY (1.7%)
  Cambrex Corporation                     137,200      7,014
  A Schulman Inc.                         274,950      6,736
                                                    --------
      Total                                           13,750
                                                    --------
DRUGS (1.5%)
  Cardinal Health Inc.                    162,612     11,728
                                                    --------
ELECTRICAL EQUIPMENT (1.5%)
 *CIDCO Incorporated                      154,400      5,443
  Methode Electronics Inc.                400,700      6,812
                                                    --------
      Total                                           12,255
                                                    --------
ELECTRONICS (3.4%)
 *ADC Telecommunication                   162,400      7,308
  AVX Corporation                         125,000      2,312
 *Computer Products, Inc.                 220,000      3,768
 *Gemstar International Group             125,000      3,750
 *In Focus Systems Inc.                    96,300      2,335
  Molex Inc.                              184,789      5,428
 *Xylan Corporation                        43,800      2,037
                                                    --------
      Total                                           26,938
                                                    --------
ENVIRONMENTAL CONTROL (1.1%)
 *TETRA Technologies, Inc.                448,941      8,979
                                                    --------
FINANCIAL SERVICES (2.1%)
  Investors Financial Services            200,000      4,650
  Money Store, Inc.                       320,150      7,083
 *WFS Financial Corporation               242,600      5,457
                                                    --------
      Total                                           17,190
                                                    --------
FOOD SERVICE/LODGING (2.5%)
 *Hospitality Franchise Systems,
    Inc.                                  183,100     12,817
 *Studio Plus Hotels Inc.                 210,100      6,933
                                                    --------
      Total                                           19,750
                                                    --------
HOSPITAL SUPPLIES (17.1%)
 *Access Health, Inc.                     109,500      5,174
 *American Medical Response Inc.          223,800      7,889
 *Apria Healthcare Group, Inc.            190,500      5,977
  Compdent Corporation                    127,000      5,905
 *Gulf South Medical Supply, Inc.         277,800     10,834
 *Inbrand Corporation                     353,250      9,891
 *Integra Life Sciences Corporation       533,600      5,203
 *Medaphis Corporation                    125,000      4,969
 *Medcath Incorporated                    153,800      1,846
 *Occusystems, Inc.                       205,900      7,696
 *Orthodontic Centers of America          236,400      6,265
 
<CAPTION>
                                                     MARKET
                                                     VALUE
                                        SHARES      (000'S)
                                      ----------    --------
<S>                                   <C>           <C>
HOSPITAL SUPPLIES (CONTINUED)
 *Patterson Dental Company                234,650   $  8,506
 *PhyCor, Inc.                            204,300      7,763
 *Physician Sales & Service, Inc.         159,100      3,858
 *Quorum Health Group, Inc.               225,900      5,958
 *Respironics Inc.                        319,600      5,913
 *Steris Corp.                            237,500      7,600
 *Sybron, Inc.                            273,900      6,848
 *United Dental Care, Inc.                210,600      8,898
 *Vivra Incorporated                      289,900      9,530
                                                    --------
      Total                                          136,523
                                                    --------
INSURANCE (2.2%)
  CMAC Investment Corp.                   121,600      6,992
 *CRA Managed Care Inc.                   125,000      5,594
 *Riscorp, Inc.                           295,800      5,398
                                                    --------
      Total                                           17,984
                                                    --------
LEISURE RELATED (3.8%)
 *Blythe Industries, Inc.                 288,000     13,068
  The Marcus Corporation                  144,050      3,619
 *Regal Cinemas                           192,500      8,807
 *Scientific Games Holding Corp.          176,800      5,127
                                                    --------
      Total                                           30,621
                                                    --------
MACHINERY (1.4%)
 *ABC Rail Products                       193,000      4,174
  Kaydon Corporation                      166,400      7,155
                                                    --------
      Total                                           11,329
                                                    --------
MEDIA (0.3%)
 *Clear Channel Communications             30,000      2,471
                                                    --------
OFFICE EQUIPMENT (9.6%)
 *Cambridge Technology Partners           386,100     11,776
 *CBT Group                                92,000      4,255
 *DST Systems, Inc.                       201,100      6,435
 *Metatools, Inc.                          61,600      1,448
 *Nu-Kote Holdings Inc. -- "A" 
    Series                                396,400      6,590
  Paychex Incorporated                    215,450     10,369
 *Peak Technologies                       219,800      5,138
 *Sterling Commerce, Inc.                 137,400      5,101
 *Sterling Software, Inc.                 121,100      9,325
 *USCS International, Inc.                 36,000        693
 *Viking Office Products Inc.             369,000     11,577
 *Zebra Technologies                      235,400      4,178
                                                    --------
      Total                                           76,885
                                                    --------
OFFICE EQUIPMENT-SERVICES (9.8%)
  American Management System Inc.         412,275     12,059
  Danka Business Systems                  117,500      3,437
  First Data Corporation                  157,395     12,533
  HBO & Co.                               150,000     10,163
 *Intuit Inc.                              50,000      2,363
 *Medic Computer Systems, Inc.             92,300      7,488
  National Data Corp.                     145,000      4,966
 *PMT Services, Inc.                      305,400      8,742
 *Peoplesoft, Inc.                        170,400     12,141
 *Trident International, Inc.             195,000      4,241
                                                    --------
      Total                                           78,133
                                                    --------
</TABLE>
 
                                       57
<PAGE>   61
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                       AGGRESSIVE GROWTH STOCK PORTFOLIO
                            SCHEDULE OF INVESTMENTS
                                 JUNE 30, 1996
<TABLE>
<CAPTION>
                                                     MARKET
                                                     VALUE
                                        SHARES      (000'S)
                                      -----------   --------
<S>                                   <C>           <C>
COMMON STOCK (CONTINUED)
OIL & GAS PROGRAMS (0.7%)
  Parker And Parsley Petroleum Co.        209,500   $  5,814
                                                    --------
OIL FIELD SERVICES (1.5%)
  Production Operators Corp.              151,800      5,123
  Tosco Corporation                       134,800      6,774
                                                    --------
      Total                                           11,897
                                                    --------
PAPER (0.6%)
  Wausau Paper Mills Company              253,418      5,005
                                                    --------
PRINTING & PUBLISHING (1.1%)
 *Catalina Marketing Corporation           97,600      8,930
                                                    --------
PROFESSIONAL SERVICES (4.6%)
 *CUC International Inc.                  253,450      8,997
  Cintas Corporation                      165,300      8,844
 *Corrections Corporation of America       45,300      3,171
 *Interim Services Inc.                   118,500      5,095
 *Metromail Corporation                    30,000        671
 *Robert Half International Inc.          343,000      9,561
                                                    --------
      Total                                           36,339
                                                    --------
RAILROADS (0.8%)
 *Wisconsin Central Transportation        188,700      6,133
                                                    --------
RETAIL-GENERAL (8.9%)
 *Corporate Express, Inc.                 196,600      7,864
 *Eastbay, Inc.                            73,500      1,103
  Fastenal Co.                            188,900      8,217
 *Global Direct Mail Corp.                213,900      8,449
 *K & G Men's Center, Inc.                335,000      7,035
 *Kohls Department Stores                 195,200      7,149
 *Micro Warehouse Inc.                     80,100      1,602
 *Multiple Zones International Inc.       150,000      1,988
 *Oakley, Inc.                            173,000      7,872
 *Office Max, Inc.                        336,000      8,022
 *O'Reilly Automotive, Inc.               183,800      6,663
 *Tractor Supply Company                  221,200      5,032
                                                    --------
      Total                                           70,996
                                                    --------
TELECOMMUNICATIONS (8.1%)
 *AirTouch Communications                 190,700      5,387
 *APAC TeleServices, Inc.                 201,000      7,236
 
<CAPTION>
                                                     MARKET
                                        SHARES/      VALUE
                                          PAR       (000'S)
                                      -----------   --------
<S>                                   <C>           <C>
TELECOMMUNICATIONS (CONTINUED)
 *LCI International                       321,800   $ 10,096
 *Mcleod, Inc.                             22,500        540
 *Midcom Communication                    101,000      1,452
 *Premiere Technologies, Inc.             151,200      4,763
 *Saville Systems                         250,100      6,909
 *Tellabs Inc.                            170,000     11,369
 *Tesco Technologies Incorporation        190,700      6,961
 *Transaction Systems Architects          153,113     10,259
                                                    --------
      Total                                           64,972
                                                    --------
TRANSPORTATION (0.6%)
 *Coach USA, Inc.                         230,000      5,117
                                                    --------
TRUCKING-SHIPPING (4.1%)
 *Eagle USA Airfreight, Inc.              195,100      7,219
 *Fritz Companies, Inc.                   305,600      9,856
 *Heartland Express Incorporated          282,962      7,569
 *Landstar System, Inc.                   278,800      8,085
                                                    --------
      Total                                           32,729
                                                    --------
      Total Common Stock                             746,093
                                                    --------
MONEY MARKET INVESTMENTS (6.7%)
DRUGS (1.8%)
  SmithKline Beecham Corp., 5.37%,
    7/31/96                           $14,000,000   $ 13,933
                                                    --------
FINANCE COMPANIES (1.5%)
  Ford Motor Credit Company, 5.29%,
    7/10/96                            12,000,000     11,981
                                                    --------
FINANCIAL SERVICES (3.4%)
  BAT Capital Corporation, 5.35%,
    7/17/96                            12,000,000     11,968
  General Electric Capital
    Corporation, 5.34%, 7/3/96          3,400,000      3,398
  General Electric Company, 5.31%,
    7/3/96                             12,000,000     11,993
                                                    --------
      Total                                           27,359
                                                    --------
      Total Money Market Investments                  53,273
                                                    --------
      Total Investments                             $799,366
                                                    ========
</TABLE>
 
* Non-Income Producing
 
    The Accompanying Notes are an Integral Part of the Financial Statements
                       (Prepared From Unaudited Figures)
 
                                       58
<PAGE>   62
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                         INTERNATIONAL EQUITY PORTFOLIO
                            SCHEDULE OF INVESTMENTS
                                 JUNE 30, 1996
<TABLE>
<CAPTION>
                                                         MARKET
                                                         VALUE
                                 COUNTRY     SHARES     (000'S)
                                 -------   ----------   --------
<S>                              <C>       <C>          <C>
COMMON STOCKS (84.2%)
AIRLINES (1.2%)
  Quantas Airways (144A)          Austrl.     165,000   $  2,788
  Singapore Airlines Ltd.         Sing.       205,000      2,165
                                                        --------
      Total                                                4,953
                                                        --------
APPLIANCES & HOUSEHOLD DURABLES (1.3%)
  Sony Corporation                Jpn.         83,000      5,468
                                                        --------
AUTOMOBILES (2.4%)
  Renault SA                      Fr.         152,000      3,927
  Volvo Aktiebogelegt, B Free     Swe.        260,000      5,928
                                                        --------
      Total                                                9,855
                                                        --------
BANKING & CREDIT (14.9%)
  Argentina Corp. Bancaris de
    Espania, ADR                  Sp.         195,000      4,290
  Australia & New Zealand Bank
    Group                         Austrl.     926,097      4,382
  Banco Bilboa Vizcaya            Sp.         162,500      6,590
  Banco de Andulucia              Sp.          30,000      4,184
  Banque National de Paris, ADR
    (144A)                        Fr.         146,500      5,146
  Barkley's Bank, PLC             U.K.        311,016      3,732
  BPI Soc de Gestora de Part Sa
    ORD                           Pte.        146,350      1,857
  Canadian Imperial Bank of
    Commerce                      Can.        177,000      5,711
  Deutsche Bank                   Ger.        111,500      5,279
  HSBC Holdings ORD               H.K.        308,237      4,659
  Komercni Bank GDR (144A)        Czk.         30,000        810
  Komercni Bank ORD               Czk.         15,000      1,224
  Merita Limited Series "A"       Fin.      1,000,000      2,115
  National Bank of Canada
    Montreal                      Can.        360,000      3,006
  Panin Bank Foreign Registered   Indo.     1,782,000      1,646
  Stadshypotek AB "A" (144A)      Swe.        120,000      2,682
  Svenska Handelsbanken S A       Swe.        230,000      4,810
                                                        --------
      Total                                               62,123
                                                        --------
BEVERAGES & TOBACCO (0.2%)
  Swedish Match AB Feuer          Swe.        240,000        747
                                                        --------
BUILDING MATERIALS AND COMPONENTS (1.1%)
  Pioneer International Ltd.      Austrl.   1,600,000      4,653
                                                        --------
BUSINESS & PUBLIC SERVICE (3.4%)
  Esselte AB, Series "A"          Swe.        269,900      5,461
  Hyder PLC                       U.K.        371,666      4,120
  Hyder PLC Cum. Red. Pfd.        U.K.        401,400        602
  Societe Generale de Surv
    Holdings                      Swtz.           885      2,120
 *Waste Management PLC, ADR       U.K.        168,000      1,869
                                                        --------
      Total                                               14,172
                                                        --------
CHEMICALS (4.4%)
  Bayer AG                        Ger.        180,000      6,362
  European Vinyls Corp. EVC
    International                 Neth.        36,525      1,135
  Rhone Poulenc SA, NPV           Fr.           6,508        171
  Rhone Poulenc SA, Series A      Fr.         243,000      6,391
  Solvay Et Cie A NPV             Bel.          7,300      4,519
                                                        --------
      Total                                               18,578
                                                        --------
 
<CAPTION>
                                                         MARKET
                                                         VALUE
                                 COUNTRY     SHARES     (000'S)
                                 -------   ----------   --------
<S>                              <C>       <C>          <C>
CONSTRUCTION AND HOUSING (1.2%)
  Daito Trust Construction Co.    Jpn.        195,000   $  2,922
  Kyudendo Corp.                  Jpn.        146,000      1,961
                                                        --------
      Total                                                4,883
                                                        --------
ELECTRICAL & ELECTRONICS (3.7%)
  ABB AG Baden Bearer             Swtz.         4,730      5,858
  Alcatel Alsthom DG              Fr.          57,500      5,019
  Hitachi Ltd.                    Jpn.        505,000      4,707
                                                        --------
      Total                                               15,584
                                                        --------
ELECTRICAL COMPONENTS, INSTRUMENTS (1.2%)
  BICC, ORD                       U.K.      1,015,000      4,880
                                                        --------
ENERGY SOURCES (3.6%)
  Hafslund Nycomed "A"            Nor.        170,000      1,218
  Repsol SA                       Sp.         122,000      4,247
  Saga Petrolium                  Nor.        260,000      3,825
  Societe Nationale Elf
    Aquitane                      Fr.          77,801      5,726
                                                        --------
      Total                                               15,016
                                                        --------
FINANCIAL SERVICES (4.3%)
  AXA SA                          Fr.          93,928      5,142
  AXA Temp. Nontradeable Cert.    Fr.           1,785         98
 *Capital Portugal Fund           Port.        22,000      2,173
  Chile Fund                      U.S.         35,000        858
  India Fund, Series "B"          U.K.      1,256,515      2,411
 *JF Indonesia Fund Inc.          H.K.        456,600        575
  Korea International Trust       Kor.             52      2,626
  Thai Fund Inc.                  Thai.        70,817      1,673
  Thailand International Fund     Thai.            70      2,327
                                                        --------
      Total                                               17,883
                                                        --------
FOOD & HOUSEHOLD PRODUCTS (3.2%)
  Albert Fisher Group             U.K.      6,429,590      4,595
  Cafe de Coral Holdings, Ltd.    H.K.      7,672,000      2,131
  Hillsdown Holdings              U.K.      1,800,892      4,840
  Vitro SA NPV                    Mex.        768,400      1,783
                                                        --------
      Total                                               13,349
                                                        --------
FOREST PRODUCTS & PAPER (2.8%)
  Carter Holt Harvey Ltd.         N.Z.      1,995,957      4,567
  Metsa Serla OY "B"              Fin.        277,500      1,977
  PT Barito Pacifice Timber       Indo.       937,000        614
  Stora Kopparberg, Series "B"
    Free                          Swe.        350,000      4,624
                                                        --------
      Total                                               11,782
                                                        --------
HEALTH & PERSONAL CARE (2.1%)
  Astra AB Series "A" Free        Swe.        140,000      6,194
  Nycomed ASA Series "A"          Norw.       170,000      2,449
                                                        --------
      Total                                                8,643
                                                        --------
INSURANCE (3.9%)
  Aegon NV                        Neth.       120,147      5,537
  ING Groep NV                    Neth.       190,000      5,671
  London Insurance Group          Can.        162,600      3,406
 *Zurich Versicherung             Swtz.         5,800      1,582
                                                        --------
      Total                                               16,196
                                                        --------
</TABLE>
 
                                       59
<PAGE>   63
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                         INTERNATIONAL EQUITY PORTFOLIO
                            SCHEDULE OF INVESTMENTS
                                 JUNE 30, 1996
<TABLE>
<CAPTION>
                                                         MARKET
                                                         VALUE
                                 COUNTRY     SHARES     (000'S)
                                 -------   ----------   --------
<S>                              <C>       <C>          <C>
COMMON STOCKS (CONTINUED)
MACHINERY & ENGINEERING (1.3%)
  Hitachi Koki Co. Ltd.           Jpn.        181,000   $  1,786
  VA Technologies AG Bearer
    (144A)                        Aus.         30,000      3,689
                                                        --------
      Total                                                5,475
                                                        --------
MERCHANDISING (1.7%)
  Koninklijke Bijenkorf Beheer    Neth.        44,098      3,729
  Kwik Save Group                 U.K.        457,252      3,197
                                                        --------
      Total                                                6,926
                                                        --------
METALS & MINING (2.1%)
  Elkem A S Oslo ord A Free       Nor.        192,000      2,647
 *Inmet Mining Ltd.               Can.        192,500      1,403
  Pechinery Cert. D'Invest        Fr.          47,500        986
 *Union Minerie, NPV              Bel.         50,500      3,921
                                                        --------
      Total                                                8,957
                                                        --------
MULTI-INDUSTRY (5.1%)
  Amer Group "A"                  Fin.        175,000      2,946
  BTR Nylex Ltd.                  Austrl.     249,000        957
  Comp Gen de Industrieset de
    Partec                        Fr.           4,500      1,036
  Hutchinson Whampoa              H.K.        798,000      5,020
  Jardine Matheson Holdings       H.K.        550,501      4,046
  Jardine Strategic Holdings      H.K.      1,019,055      3,261
  Marlene Wendel SA               Fr.           5,025        416
  Swire Pacific Class "A"         H.K.        472,500      4,044
                                                        --------
      Total                                               21,726
                                                        --------
RAILROAD (0.8%)
  Brambles Ind. Ltd.             Austrl.      240,000      3,335
                                                        --------
TELECOMMUNICATIONS (9.2%)
  CIA de Inversiones en Tel
    Euro                          Chile        73,150      4,280
  CIA De Telefons Chile SA        Chile        36,500      3,582
  Nacional Fincanciera CNV        Mex.        117,802      3,946
  Phillipine Long Distance
    Telephone                     Phil         79,000      4,592
 *SPT Telecom AS                  Chez.        36,000      4,397
  Stet Di Risp Non-Conv.          Italy     2,490,000      6,543
  Telebras ADR                    Braz.        77,500      5,396
  Telefonica De Espana            Sp.         315,000      5,809
                                                        --------
      Total                                               38,545
                                                        --------
 
<CAPTION>
                                                         MARKET
                                            SHARES/      VALUE
                                 COUNTRY      PAR       (000'S)
                                 -------   ----------   --------
<S>                              <C>       <C>          <C>
UTILITIES-ELECTRIC & GAS (7.8%)
  British Gas                     U.K.      1,358,200   $  3,777
 *CEZ Ceske Energeticke Zavody    Chez.       101,990      4,059
  Electicidad De Caracas          Venz.     3,416,836      2,841
  Endesa National De Electric     Sp.          63,000      3,933
  Evn Energierversorgung          Aus.         38,400      5,310
  Hong Kong Electric              H.K.        990,000      3,018
  Iberdrola SA                    Sp.         587,500      6,036
 *Veba AG Warrants, Exp.
    4/6/98                        Ger.         12,000      3,425
                                                        --------
      Total                                               32,399
                                                        --------
WHOLESALE & INTERNATIONAL TRADE (1.3%)
  Brierley Investments Ltd. TD    N.Z.      5,716,091      5,421
                                                        --------
      Total Common Stock                                 351,549
                                                        --------
BONDS (3.4%)
BANKING AND CREDIT (1.8%)
  PIV Financial Inc. Cayman,
    4.5%, 12/1/00                 H.K.     $2,750,000   $  2,310
  CS Holding Finance BV,
    4 7/8%, 11/19/02              U.K.      3,715,000      5,387
                                                        --------
      Total                                                7,697
                                                        --------
FEDERAL GOVERNMENT & AGENCIES (0.7%)
  U.S. Treasury Notes, 5 1/8%,
    4/30/98                       U.S.      2,757,000      2,711
                                                        --------
UTILITIES-ELECTRIC & GAS (0.9%)
  National Power, Convertible Bond,
    6 1/4%, 9/23/08               U.K.      2,138,000      3,952
                                                        --------
      Total Bonds                                         14,360
                                                        --------
MONEY MARKET INVESTMENTS (12.4%)
FINANCIAL SERVICES (8.1%)
  American Express, 5.39%,
    7/1/96                        U.S.     17,000,000     17,000
  West Landesbank TD, 5.5%,
    7/1/96                        U.S.     17,000,000     17,000
                                                        --------
      Total                                               34,000
                                                        --------
INSURANCE (4.3%)
  Prudential, 5.42%, 7/1/96       U.S.     17,924,000     17,924
                                                        --------
      Total Money Market
         Investments                                      51,924
                                                        --------
      Total Investments                                 $417,833
                                                        ========
</TABLE>
 
* Non-Income Producing
 
    The Accompanying Notes are an Integral Part of the Financial Statements
                       (Prepared from Unaudited Figures)
 
                                       60
<PAGE>   64
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                             SELECT BOND PORTFOLIO
                            SCHEDULE OF INVESTMENTS
                                 JUNE 30, 1996
<TABLE>
<CAPTION>
                                                      MARKET
                                                      VALUE
                                          PAR        (000'S)
                                       ----------    --------
<S>                                    <C>           <C>
BONDS (80.2%)
AIRLINES (1.2%)
  Delta Air Lines, Inc., 9 3/4%,
    5/26/03                            $  546,000    $    604
  Delta Air Lines, Inc., 9 3/4%,
    6/1/03                              1,605,000       1,775
                                                     --------
      Total                                             2,379
                                                     --------
AUTO RELATED (0.5%)
  Hertz Corp., 9.04%, 6/14/00             900,000         965
                                                     --------
BANKS (0.9%)
  Natwest Capital Corporation,
    12 1/8%, 11/15/02                   1,700,000       1,815
                                                     --------
BEVERAGES (2.6%)
  Coca-Cola Enterprises Inc., 8%,
    1/4/05                              5,000,000       5,310
                                                     --------
CHEMICALS (1.0%)
  Dow Capital B.V., 8 1/2%, 6/8/10      1,800,000       1,952
                                                     --------
CMO & LOAN-BACKED CERTIFICATES (14.4%)
  CIT RV Owner Trust, 6 1/4%, 1/15/11   1,757,347       1,746
  Eaglemark Trust, 6 3/4%, 11/15/02
    (144A)                              2,000,000       2,006
  Federal Home Loan Mortgage Corp.,
    7%, 6/1/25                          6,007,242       5,784
  Federal Home Loan Mortgage Corp.,
    7 1/4%, 4/15/18                     2,425,000       2,445
  Federal Home Loan Mortgage Corp.,
    7%, 3/15/07                         1,875,000       1,824
  Federal Home Loan Mortgage Corp.,
    6%, 7/15/07                         3,900,000       3,717
  Federal National Mortgage Assoc.,
    6 3/4%, 12/25/23                    3,500,000       3,129
  Ford Motor Credit Grantor Trust,
    5.9%, 10/15/00                      2,387,105       2,378
  Premier Auto Trust, 6.65%, 4/2/98     3,300,000       3,321
  Rural Housing Trust, 6.33%, 4/1/26    2,456,020       2,372
                                                     --------
      Total                                            28,722
                                                     --------
FEDERAL GOVERNMENT AND AGENCIES (30.5%)
  Government National Mortgage Assoc.,
    8 1/2%, 3/15/23                        10,896          11
  Government National Mortgage Assoc.,
    7%, 5/15/23                           488,463         472
  Government National Mortgage Assoc.,
    7 1/2%, 2/15/24                     1,853,867       1,828
  Government National Mortgage Assoc.,
    7%, 5/15/23                         3,075,777       2,969
  Government National Mortgage Assoc.,
    8 1/2%, 9/15/24                        16,828          17
  Government National Mortgage Assoc.,
    8 1/2%, 6/15/23                        19,578          20
  Government National Mortgage Assoc.,
    8 1/2%, 6/15/24                       392,903         405
 
<CAPTION>
                                                      MARKET
                                                      VALUE
                                          PAR        (000'S)
                                       ----------    --------
<S>                                    <C>           <C>
FEDERAL GOVERNMENT AND AGENCIES (CONTINUED)
  Government National Mortgage Assoc.,
    8 1/2%, 7/15/24                    $  101,109    $    104
  Government National Mortgage Assoc.,
    8 1/2%, 2/15/25                       115,766         119
  Government National Mortgage Assoc.,
    7 1/2%, 1/15/24                       895,729         883
  Government National Mortgage Assoc.,
    7 1/2%, 1/15/24                       883,135         871
  Government National Mortgage Assoc.,
    8 1/2%, 2/15/25                        17,576          18
  Government National Mortgage Assoc.,
    8 1/2%, 11/15/24                      312,612         322
  Government National Mortgage Assoc.,
    8 1/2%, 5/15/26                       227,390         234
  Government National Mortgage Assoc.,
    7 1/2%, 6/15/24                     1,685,286       1,661
  Government National Mortgage Assoc.,
    8 1/2%, 11/15/24                      314,859         324
  Government National Mortgage Assoc.,
    8 1/2%, 4/15/26                       399,976         412
  Government National Mortgage Assoc.,
    8 1/2%, 11/15/24                      473,409         487
  Government National Mortgage Assoc.,
    8 1/2%, 4/15/26                       379,073         390
  Government National Mortgage Assoc.,
    8 1/2%, 5/15/26                       779,846         803
  Government National Mortgage Assoc.,
    8 1/2%, 9/15/21                       198,322         204
  Government National Mortgage Assoc.,
    7%, 6/15/23                         2,765,711       2,670
  U.S. Treasury, 7 1/8%, 2/15/23        8,000,000       8,080
  U.S. Treasury, 6 1/4%, 8/15/23        1,500,000       1,359
  U.S. Treasury, 7 1/2%, 11/15/24      19,000,000      20,140
  U.S. Treasury, 6 3/8%, 8/15/02        1,000,000         991
  U.S. Treasury, 6 7/8%, 7/31/99       15,000,000      15,216
                                                     --------
      Total                                            61,010
                                                     --------
FINANCE COMPANIES (1.9%)
  Associates Corp. of North America,
    7.95%, 2/15/10                      1,500,000       1,594
  Avco Financial Services, Inc.,
    5 7/8%, 10/15/97                    2,200,000       2,191
                                                     --------
      Total                                             3,785
                                                     --------
FINANCIAL SERVICES (1.8%)
  Beneficial Corp., 6.86%, 11/19/97     2,200,000       2,219
  Electronic Data Systems Corp.,
    8.8%, 3/1/21                        1,250,000       1,399
                                                     --------
      Total                                             3,618
                                                     --------
FOODS (1.8%)
  Nabisco Inc., 8%, 1/15/00             1,500,000       1,552
  RJR Nabisco Inc., 8 5/8%, 12/01/02    2,000,000       2,029
                                                     --------
      Total                                             3,581
                                                     --------
FOREIGN GOVERNMENT BONDS (0.7%)
  Province of Quebec, 7 1/8%, 2/9/24    1,500,000       1,373
                                                     --------
</TABLE>
 
                                       61
<PAGE>   65
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                             SELECT BOND PORTFOLIO
                            SCHEDULE OF INVESTMENTS
                                 JUNE 30, 1996
<TABLE>
<CAPTION>
                                                      MARKET
                                                      VALUE
                                          PAR        (000'S)
                                       ----------    --------
<S>                                    <C>           <C>
BONDS (CONTINUED)
LEISURE RELATED (3.8%)
  Tele Communications, Inc., 7 3/8%,
    2/15/00                            $2,000,000    $  1,975
  Tele Communications, Inc., 7 1/4%,
    8/1/05                              2,750,000       2,545
  Time Warner Entertainment Inc.,
    8 7/8%, 10/1/12                     2,000,000       2,066
  Time Warner Entertainment Inc.,
    7 1/4%, 9/1/08                      1,000,000         937
                                                     --------
      Total                                             7,523
                                                     --------
OFFICE EQUIPMENT (1.5%)
  International Business Machines
    Corp., 6 3/8%, 11/1/97              3,000,000       3,008
                                                     --------
PRINTING & PUBLISHING (2.3%)
  News America Holdings Inc., 7 1/2%,
    3/1/00                              3,500,000       3,559
  News America Holdings Inc., 8 1/4%,
    8/10/18                             1,000,000         983
                                                     --------
      Total                                             4,542
                                                     --------
REAL ESTATE INVESTMENT TRUSTS (1.0%)
  Security Capital Industrial Trust,
    7.3%, 5/15/01                       2,000,000       1,981
                                                     --------
RETAIL-GENERAL (0.8%)
  Dayton Hudson Corporation, 8.6%,
    1/15/12                             1,500,000       1,620
                                                     --------
TOBACCO (1.4%)
  Philip Morris Companies, 9%,
    5/15/98                             1,750,000       1,824
  Philip Morris Companies, 9 1/4%,
    2/15/00                             1,000,000       1,078
                                                     --------
      Total                                             2,902
                                                     --------
UTILITY-ELECTRIC (11.2%)
  Cleveland Electric Illum. Co.,
    7 3/8%, 6/1/03                      1,000,000         904
  Korea Electric Power Corporation,
    7 3/4%, 4/1/13                      2,000,000       1,974
  Long Island Lighting Co., 9 5/8%,
    7/1/24                              1,500,000       1,499
  Pacific Gas & Electric Co., 7 1/4%,
    3/1/26                              3,500,000       3,189
  Pacific Gas & Electric Co., 5 3/8%,
    8/1/98                              2,600,000       2,543
 
<CAPTION>
                                                      MARKET
                                                      VALUE
                                          PAR        (000'S)
                                       ----------    --------
<S>                                    <C>           <C>
UTILITY-ELECTRIC (CONTINUED)
  Pennsylvania Power & Light, 5 1/2%,
    4/1/98                             $3,000,000    $  2,947
  PECO Energy Company, 7 1/2%,
    1/15/99                             1,500,000       1,528
  PECO Energy Company, 7 3/4%, 3/1/23   1,150,000       1,112
  Public Service Electric & Gas,
    6 7/8%, 1/1/03                      2,250,000       2,206
  Texas Utilities Electric Co, 7 7/8,
    3/1/23                              2,250,000       2,180
  UNICOM Corp., 6 1/2%, 4/15/00         2,300,000       2,256
                                                     --------
      Total                                            22,338
                                                     --------
UTILITY-GAS (0.9%)
  Columbia Gas System Inc., 7.32%,
    11/28/10                            2,000,000       1,913
                                                     --------
      Total Bonds                                     160,337
                                                     --------
MONEY MARKET INVESTMENTS (19.8%)
AUTO (3.4%)
  Ford Motor Credit Company, 5.29%,
    7/10/96                            $6,900,000    $  6,889
                                                     --------
DRUGS (4.0%)
  SmithKline Beecham Corp., 5.37%,
    7/31/96                             8,000,000       7,962
                                                     --------
FINANCE COMPANIES (1.1%)
  Associates Corp. of North America,
    6 7/8%, 1/15/97                     2,200,000       2,212
                                                     --------
FINANCIAL SERVICES (9.3%)
  BAT Capital Corporation, 5.35%,
    7/17/96                             8,000,000       7,979
  General Electric Capital
    Corporation, 5.34%, 7/3/96          2,700,000       2,698
  Philip Morris Capital Corp., 5.3%,
    7/3/96                              7,900,000       7,895
                                                     --------
      Total Bonds                                      18,572
                                                     --------
UTILITY-ELECTRIC (2.0%)
  DTE Energy Company, 5.41%, 5/1/97     4,000,000       3,974
                                                     --------
      Total Money Market Investments                   39,609
                                                     --------
      Total Investments                              $199,946
                                                     ========
</TABLE>
 
    The Accompanying Notes are an Integral Part of the Financial Statements
                       (Prepared from Unaudited Figures)
 
                                       62
<PAGE>   66
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                           HIGH YIELD BOND PORTFOLIO
                            SCHEDULE OF INVESTMENTS
                                 JUNE 30, 1996
<TABLE>
<CAPTION>
                                                      MARKET
                                                       VALUE
                                           PAR        (000'S)
                                        ----------    -------
<S>                                     <C>           <C>
BONDS (87.0%)
APPAREL, TEXTILES & FOOTWEAR (1.1%)
 +Ithaca Industries, 11 1/8%,
    12/15/02                            $1,700,000    $   778
                                                      -------
AUTO RELATED (5.4%)
  Alamo Rent-A-Car Inc., 11 3/4%,
    1/31/06                              1,500,000      1,545
  Collins & Aikman Products, 11 1/2%,
    4/15/06                              1,000,000      1,015
  Exide Corporation, 10 3/4%,
    12/15/02                               500,000        507
++Exide Corporation, 12 1/4%,
    12/15/04                             1,000,000        845
                                                      -------
      Total                                             3,912
                                                      -------
BANKS (2.9%)
  First Nationwide Bank, 12 1/2%,
    4/15/03                              2,000,000      2,085
                                                      -------
BROADCASTING (1.4%)
  SFX Broadcasting, 10 3/4%, 5/15/06
    (144A)                               1,000,000        995
                                                      -------
BUILDING & CONSTRUCTION (1.5%)
  Primeco Inc., 12 3/4%, 3/1/05          1,000,000      1,070
                                                      -------
CABLE (5.5%)
  Adelphia Communications, 12 1/2%,
    5/15/02                              1,000,000      1,015
  Lenfest Communications Inc.,
    10 1/2%, 6/15/06 (144A)              1,500,000      1,526
++Marcus Cable Operating, 13 1/2%,
    8/1/04                               2,000,000      1,430
                                                      -------
      Total                                             3,971
                                                      -------
CHEMICALS (2.8%)
  NL Industries, Inc., 11 3/4%,
    10/15/03                             1,000,000      1,020
  Texas Petrochemical Corp., 11 1/8%,
    7/1/06 (144A)                        1,000,000      1,020
                                                      -------
      Total                                             2,040
                                                      -------
ELECTRONICS (3.0%)
  Exide Electronics Group, 11 1/2%,
    3/15/06 (144A)                       2,000,000      2,120
                                                      -------
FINANCE COMPANIES (8.6%)
  Cobb Theatres/Financial Corp.,
    10 5/8%, 3/1/03 (144A)               1,500,000      1,534
  Homeside Inc., 11 1/8%, 5/15/03
    (144A)                               2,000,000      2,070
  Polysindo International Finance,
    11 3/8%, 6/15/06                     1,000,000      1,020
  Trizec Finance, 10 7/8%, 10/15/05      1,500,000      1,538
                                                      -------
      Total                                             6,162
                                                      -------
FOOD SERVICE/LODGING (1.9%)
  Fleming Companies, Inc., 10 5/8%,
    12/15/01                             1,500,000      1,361
                                                      -------
FOODS (0.7%)
 +Beatrice Foods, Inc., 12%, 12/1/01    1,500,000        465
                                                      -------
GAMING (13.1%)
  Alliance Gaming, 12 7/8%, 6/30/03        750,000        748
  Aztar Corporation, 13 3/4%, 10/1/04    1,000,000      1,147
  Bally's Grand, 10 3/8%, 12/15/03       1,000,000      1,096
  GNF Corp., 10 5/8%, 4/1/03             1,500,000      1,639
  Station Casinos, Inc., 10 1/8%,
    3/15/06                                500,000        489
  Trump Atlantic City, 11 1/4%,
    5/1/06                               2,500,000      2,513
  Trump Hotels & Casino Resort,
    15 1/2%, 6/15/05                     1,500,000      1,774
                                                      -------
      Total                                             9,406
                                                      -------
LEISURE RELATED (1.5%)
  Cobblestone Holdings Inc., 0%,
    6/1/04 (144A)                        2,875,000      1,064
                                                      -------
 
<CAPTION>
                                                      MARKET
                                                       VALUE
                                           PAR        (000'S)
                                                      -------
<S>                                     <C>           <C>
MEDICAL SUPPLIES (2.9%)
  Dade International Inc.,
    11 1/8%, 5/1/06 (144A)              $2,000,000    $ 2,070
                                                      -------
OFFICE EQUIPMENT (1.5%)
  United Stationer Supply Co.,
    12 3/4%, 5/1/05                      1,000,000      1,073
                                                      -------
OIL & GAS-DOMESTIC (0.9%)
++Transamerican Refining Corp.,
    18 1/2%, 2/15/02                     1,000,000        635
                                                      -------
OIL & GAS-INTERNATIONAL (6.3%)
  Bridas Corporation,
    12 1/2%, 6/10/03 (144A)              1,500,000      1,547
  Mesa Operating Co., 10 5/8%, 7/1/06    1,000,000      1,011
  Transtexas Gas, 11 1/2%, 6/15/02       2,000,000      1,995
                                                      -------
      Total                                             4,553
                                                      -------
PAPER (3.5%)
  Indah Kiat International Finance,
    12 1/2%, 6/15/06                     1,000,000      1,065
  Repap Wisconsin Incorporated,
    9 1/4%, 2/1/02                         500,000        471
  Repap New Brunswick, 10 5/8%,
    4/15/05                              1,000,000        943
                                                      -------
      Total                                             2,479
                                                      -------
RETAIL-FOOD (12.3%)
  Grand Union Company, 12%, 9/1/04       1,000,000        934
  Jitney-Jungle Stores, 12%, 3/1/06      1,500,000      1,530
  P & C Food Markets, Inc., 11 1/2%,
    10/15/01                               375,000        357
  Pathmark Stores, 11 5/8%, 6/15/02      1,500,000      1,492
  Penn Traffic Company, 9 5/8%,
    4/15/05                              1,000,000        717
  Penn Traffic Company, 11 1/2%,
    4/15/06                              1,000,000        927
  Ralphs Grocery Co., 11%, 6/15/05       1,500,000      1,380
  Smiths Food & Drug, 11 1/8%,
    5/15/07                              1,500,000      1,519
                                                      -------
      Total                                             8,856
                                                      -------
TELECOMMUNICATIONS (6.0%)
++Arch Communications, 10 7/8%,
    3/15/08                              1,750,000        901
  Grupo Televisa, 11 3/8%, 5/15/03
    (144A)                                 500,000        507
  Grupo Televisa, 11 7/8%, 5/15/06
    (144A)                               1,000,000      1,020
++Mobilemedia Communications,
    10 1/2%, 12/1/03                     1,000,000        710
++Teleport Communications, 11 1/8%,
    7/1/07                               2,000,000      1,165
                                                      -------
      Total                                             4,303
                                                      -------
TRUCKING-SHIPPING (2.8%)
  Gearbulk Holding Ltd., 11 1/4%,
    12/1/04                              1,000,000      1,050
  Stena AB, 10 1/2%, 12/15/05            1,000,000        993
                                                      -------
      Total                                             2,043
                                                      -------
</TABLE>
 
                                       63
<PAGE>   67
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                           HIGH YIELD BOND PORTFOLIO
                            SCHEDULE OF INVESTMENTS
                                 JUNE 30, 1996
<TABLE>
<CAPTION>
                                                      MARKET
                                                       VALUE
                                           PAR        (000'S)
                                                      -------
<S>                                     <C>           <C>
BONDS (CONTINUED)
UTILITY-PROJECT (1.4%)
  CE Casecan Water & Energy, Inc.,
    11.95%, 11/15/10 (144A)             $1,000,000    $ 1,017
                                                      -------
      Total Bonds                                      62,458
                                                      -------
COMMON STOCK WARRANTS (0.1%)
PAPER (0.1%)
  *SDW Holdings Corporation                 20,000    $    62
                                                      -------
      Total Common Stock Warrants                          62
                                                      -------
PREFERRED STOCK (7.4%)
BROADCASTING (0.7%)
  SFX Broadcasting Inc., 6 1/2,
    5/31/07 (144A)                          10,000    $   518
                                                      -------
GAMING (1.8%)
  Alliance Gaming, 15%, 6/30/04             10,000        705
  Station Casinos, 7%, 12/31/49             10,000        575
                                                      -------
      Total                                             1,280
                                                      -------
PAPER (0.9%)
  SD Warren Co., 14%, 12/15/06              20,000        620
                                                      -------
 
<CAPTION>
                                                      MARKET
                                                       VALUE
                                           PAR        (000'S)
                                        ----------    -------
<S>                                     <C>           <C>
PRINTING AND PUBLISHING (4.0%)
  K-III Communications,
    2.722%, 2/1/08 (144A)               $   10,000    $   930
  Time Warner Inc., 10 1/4%, 7/1/16
    (144A)                                  20,000      1,960
                                                      -------
      Total                                             2,890
                                                      -------
      Total Preferred Stock                             5,308
                                                      -------
MONEY MARKET INVESTMENTS (5.5%)
FINANCE COMPANIES (3.7%)
  Ford Motor Credit Company, 5.45%,
    7/3/96                              $2,700,000    $ 2,698
                                                      -------
FINANCIAL SERVICES (0.8%)
  General Electric Capital
    Corporation, 5.34%, 7/3/96             600,000        600
                                                      -------
TOBACCO (1.0%)
  Philip Morris Companies, 5.34%,
    7/31/96                                700,000        697
                                                      -------
      Total Money Market Investments                    3,995
                                                      -------
      Total Investments                               $71,823
                                                      =======
</TABLE>
 
 * Non-Income Producing.
 
 + Defaulted Security.
 
++ Denotes deferred interest security that receives no coupon payments until a
   predetermined date at which time the stated coupon rate becomes effective.
 
    The Accompanying Notes are an Integral Part of the Financial Statements
                       (Prepared from Unaudited Figures)
 
                                       64
<PAGE>   68
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                             MONEY MARKET PORTFOLIO
                            SCHEDULE OF INVESTMENTS
                                 JUNE 30, 1996
<TABLE>
<CAPTION>
                                                     MARKET
                                                     VALUE
                                         PAR        (000'S)
                                      ----------    --------
<S>                                   <C>           <C>
COMMERCIAL PAPER (96.8%)
AUTO (5.0%)
  Ford Motor Credit Company, 5.29%,
    7/10/96                           $7,200,000    $  7,188
                                                    --------
BEVERAGES (4.2%)
  Pepsico Inc., 5.75%, 9/6/96          6,000,000       5,999
                                                    --------
BUILDING-FOREST PRODUCTS (4.9%)
  Weyerhaeuser Company, 5.4%, 9/6/96   7,000,000       6,927
                                                    --------
CHEMICALS (4.9%)
  Monsanto Company, 5.27%, 7/15/96     7,000,000       6,984
                                                    --------
DRUGS (7.8%)
  American Home Products
    Corporation, 5.33%, 7/15/96        7,100,000       7,083
  American Home Products
    Corporation, 5.58%, 7/1/96         4,100,000       4,099
                                                    --------
      Total                                           11,182
                                                    --------
FINANCIAL SERVICES (19.2%)
  American General Finance
    Corporation, 5.37%, 8/28/96        7,100,000       7,036
  CIT Group Holdings Inc., 5.27%,
    7/17/96                            7,200,000       7,181
  General Electric Capital
    Corporation, 5.3%, 8/15/96         6,900,000       6,852
  Transamerica Financial Corp.,
    5.31%, 8/14/96                     6,400,000       6,357
                                                    --------
      Total                                           27,426
                                                    --------
LEISURE RELATED (4.6%)
  Walt Disney Company, 5.2%, 9/16/96   6,600,000       6,525
                                                    --------
OFFICE EQUIPMENT (10.0%)
  IBM Credit Corporation, 5.32%,
    7/31/96                            7,050,000       7,017
  Xerox Corporation, 5.29%, 7/29/96    7,100,000       7,069
                                                    --------
      Total                                           14,086
                                                    --------
 
<CAPTION>
                                                     MARKET
                                                     VALUE
                                         PAR        (000'S)
                                      ----------    --------
<S>                                   <C>           <C>
PRINTING & PUBLISHING (3.5%)
  Dow Jones & Co. Inc., 5.33%,
    7/15/96                           $5,000,000    $  4,988
                                                    --------
RETAIL-GENERAL (10.0%)
  J.C. Penney Funding Corp., 5.36%,
    8/23/96                            7,100,000       7,042
  Sears Roebuck Acceptance Corp.,
    5.39%, 8/21/96                     7,100,000       7,044
                                                    --------
      Total                                           14,086
                                                    --------
TOBACCO (8.5%)
  Philip Morris Companies, 5.37%,
    7/15/96                            5,100,000       5,088
  Philip Morris Companies, 5.28%,
    7/1/96                             7,100,000       7,098
                                                    --------
      Total                                           12,186
                                                    --------
UTILITY-ELECTRIC (4.9%)
  National Rural Utility Finance
    Corp., 5.37%, 8/29/96              7,000,000       6,936
                                                    --------
UTILITY-TELEPHONE (9.3%)
  American Telephone & Telegraph
    Co., 5.35%, 8/9/96                 6,700,000       6,659
  Bellsouth Telecommunication,
    5.35%, 8/27/96                     6,700,000       6,641
                                                    --------
      Total                                           13,300
                                                    --------
      Total Commercial Paper                         137,813
                                                    --------
ASSET-BACKED SECURITIES (3.2%)
AUTO RELATED (3.2%)
  Carco Auto Loan Master Trust,
    5.53%, 7/15/96 (Variable rate;
    puttable; coupon indexed to one
    month Commercial Paper rate plus
    7.5 basis points; reset monthly)  $4,550,000    $  4,550
                                                    --------
      Total Asset-Backed Securities                    4,550
                                                    --------
      Total Investments                             $142,363
                                                    ========
</TABLE>
 
    The Accompanying Notes are an Integral Part of the Financial Statements
                       (Prepared from Unaudited Figures)
 
                                       65
<PAGE>   69
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                               BALANCED PORTFOLIO
                            SCHEDULE OF INVESTMENTS
                                 JUNE 30, 1996
<TABLE>
<CAPTION>
                                                     MARKET
                                                     VALUE
                                      SHARES        (000'S)
                                    -----------    ----------
<S>                                 <C>            <C>
COMMON STOCK (52.5%)
AEROSPACE (1.1%)
  Boeing Company                         77,900    $    6,787
  General Dynamics Corporation           14,200           880
  Harris Corporation                      8,700           531
  Lockheed Martin Corporation            44,761         3,760
  McDonnell Douglas Corporation          50,000         2,425
  Northrop Grumman Corporation           12,800           872
  Raytheon Company                       53,900         2,783
  Rockwell International
    Corporation                          48,900         2,800
  United Technologies Corp.              27,400         3,151
                                                   ----------
      Total                                            23,989
                                                   ----------
AIRLINES (0.2%)
 *AMR Corporation                        20,200         1,838
  Delta Air Lines, Inc.                  13,900         1,154
  Southwest Airlines Co.                 32,500           947
 *USAir Group, Inc.                      14,300           257
                                                   ----------
      Total                                             4,196
                                                   ----------
APPAREL TEXTILE (0.3%)
  Brown Group, Inc.                       4,000            69
 *Fruit of the Loom, Incorporated        17,100           436
  Liz Claiborne, Inc.                    16,500           571
  Nike, Inc.                             32,300         3,319
  Reebok International, Ltd.             16,500           555
  Russell Corp.                           8,800           243
  Springs Industries, Inc.                4,500           227
  Stride Rite Corp.                      11,100            92
  VF Corporation                         14,300           853
                                                   ----------
      Total                                             6,365
                                                   ----------
AUTO & TRUCKS (1.1%)
  Chrysler Corporation                   84,200         5,220
  Ford Motor Company                    264,700         8,570
  General Motors Corporation            170,200         8,914
 *Navistar International Corp.           16,970           168
  PACCAR Incorporated                     8,795           431
                                                   ----------
      Total                                            23,303
                                                   ----------
AUTO RELATED (0.3%)
  Cooper Tire & Rubber Company           18,800           418
  Dana Corporation                       22,900           710
  Eaton Corporation                      17,500         1,026
  Echlin Inc.                            13,800           523
  Genuine Parts Company                  27,450         1,256
  Goodyear Tire & Rubber Company         34,900         1,684
  Snap-On Incorporated                    9,200           436
  TRW Inc.                               14,700         1,321
                                                   ----------
      Total                                             7,374
                                                   ----------
BANKS (3.7%)
  Banc One Corporation                  101,811         3,462
  Bank of Boston Corporation             25,200         1,247
  Bank of New York Company Inc.          43,900         2,250
  Bankamerica Corporation                82,400         6,242
  Bankers Trust New York
    Corporation                          17,900         1,322
  Barnett Banks Inc.                     21,200         1,293
  Boatmans Bancshares, Inc.              35,600         1,428
  Chase Manhattan Corporation            98,224         6,937
  Citicorp                              109,500         9,047
  Comerica, Inc.                         26,300         1,174
  Corestates Financial Corp.             49,900         1,921
 
<CAPTION>
                                                     MARKET
                                                     VALUE
                                      SHARES        (000'S)
                                    -----------    ----------
<S>                                 <C>            <C>
BANKS (CONTINUED)
  Fifth Third Bancorp                    23,000    $    1,242
  First Bank System Inc.                 31,800         1,844
  First Chicago NBD Corp.                71,305         2,790
  First Union Corporation                64,205         3,908
  Fleet Financial Group Inc.             59,119         2,572
  KeyCorp                                52,200         2,023
  Mellon Bank Corporation                30,850         1,758
  J.P. Morgan & Company, Inc.            42,300         3,580
  National City Corp.                    49,800         1,749
  Nationsbank Corp.                      67,400         5,569
  Norwest Corporation                    82,400         2,874
  PNC Bank Corp.                         76,700         2,282
  Republic New York Corporation          12,500           778
  Suntrust Banks Inc.                    51,100         1,891
  U.S. Bancorp of Oregon                 36,300         1,311
  Wachovia Corporation                   38,000         1,662
  Wells Fargo & Company                  21,966         5,247
                                                   ----------
      Total                                            79,403
                                                   ----------
BEVERAGES (2.2%)
  Anheuser-Busch Companies, Inc.         57,000         4,275
  Brown-Forman Corp.                     15,500           620
  The Coca-Cola Company                 562,000        27,468
  Adolph Coors Co.                        8,500           152
  Pepsico Inc.                          352,900        12,484
  Seagram Company Ltd.                   84,200         2,831
                                                   ----------
      Total                                            47,830
                                                   ----------
BUILDING & CONSTRUCTION (0.1%)
  Centex Corporation                      6,400           199
  Kaufman & Broad Home Corp.              8,700           126
  Masco Corporation                      36,100         1,092
  Owens-Corning Fiberglas Corp.          11,600           499
  Pulte Corporation                       6,100           163
  Sherwin-Williams Company               19,300           897
                                                   ----------
      Total                                             2,976
                                                   ----------
BUILDING-FOREST PRODUCTS (0.3%)
  Boise Cascade Corporation              10,900           399
  Champion International Corp.           21,500           898
  Georgia-Pacific Corp.                  20,600         1,463
  Louisiana-Pacific Corporation          24,400           540
  Potlatch Corporation                    6,500           254
  Weyerhaeuser Company                   44,700         1,900
                                                   ----------
      Total                                             5,454
                                                   ----------
CHEMICALS (1.3%)
  Air Products & Chemicals, Inc.         25,200         1,455
  Dow Chemical Company                   56,300         4,279
  E.I. Du Pont De Nemours & Co.         126,200         9,986
  Eastman Chemical Company, Inc.         17,875         1,088
 *FMC Corporation                         8,400           548
  B.F. Goodrich Company                  11,900           445
  Hercules Incorporated                  24,400         1,348
  Monsanto Company                      132,600         4,309
  PPG Industries Inc                     42,600         2,077
  Praxair, Inc.                          34,800         1,470
  Rohm & Haas Company                    14,900           935
  Union Carbide Corporation              30,000         1,192
                                                   ----------
      Total                                            29,132
                                                   ----------
</TABLE>
 
                                       66
<PAGE>   70
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                               BALANCED PORTFOLIO
                            SCHEDULE OF INVESTMENTS
                                 JUNE 30, 1996
<TABLE>
<CAPTION>
                                                     MARKET
                                                     VALUE
                                      SHARES        (000'S)
                                    -----------    ----------
<S>                                 <C>            <C>
COMMON STOCK (CONTINUED)
CHEMICALS-SPECIALTY (0.3%)
  Avery Dennison Corp.                   11,900    $      653
  Engelhard Corp.                        32,400           745
  W.R. Grace & Co.                       22,100         1,566
  Great Lakes Chemical                   14,500           903
  Morton International, Inc.             33,100         1,233
  Nalco Chemical Company                 15,100           476
  Sigma-Aldrich Corp.                    11,200           599
                                                   ----------
      Total                                             6,175
                                                   ----------
COAL, GAS & PIPELINE (0.2%)
  Burlington Resources, Inc.             28,500         1,225
  Eastern Enterprises                     4,500           150
  ENSERCH Corp.                          15,400           335
  NACCO Industries, Inc.                  2,000           111
  Panenergy Corp.                        34,000         1,118
  Sonat Inc.                             19,400           873
                                                   ----------
      Total                                             3,812
                                                   ----------
COMPUTER RELATED (2.0%)
  Alco Standard Corporation              28,800         1,303
 *Amdahl Corporation                     26,800           288
 *Apple Computer, Inc.                   27,800           584
 *Ceridian Corp.                         15,300           773
 *Compaq Computer Corporation            60,400         2,975
 *Cray Research, Inc.                     5,800           140
 *Data General Corporation                8,800           114
 *Digital Equipment Corporation          34,500         1,553
 *EMC Corporation                        52,000           968
 *General Instrument Corp.               28,400           820
  Hewlett-Packard Company               114,800        11,437
 *Intergraph Corp.                       10,400           126
  International Business Machines Corp. 122,400        12,118
  Moore Corporation Ltd.                 22,500           425
  Pitney Bowes Inc.                      33,700         1,609
 *Silicon Graphics                       36,600           878
 *Sun Microsystems Inc.                  41,300         2,432
 *Tandem Computers Inc.                  26,400           327
 *Unisys Corporation                     38,600           275
  Xerox Corporation                      72,900         3,900
                                                   ----------
      Total                                            43,045
                                                   ----------
CONTAINERS (0.1%)
  Ball Corporation                        6,800           195
  Bemis Company, Inc.                    11,800           413
  Crown Cork & Seal Company, Inc.        28,800         1,296
 *Tupperware Corporation                 13,900           587
                                                   ----------
      Total                                             2,491
                                                   ----------
DIVERSIFIED (0.9%)
  Allied Signal Inc.                     63,700         3,639
  Corning Inc.                           52,000         1,995
  Dial Corp.                             21,300           610
  EG&G, Inc.                             10,700           229
  ITT Industries Inc.                    26,500           666
  Loews Corp.                            26,500         2,090
  Minnesota Mining & Mfg. Company        94,200         6,500
  Teledyne, Inc.                         12,600           455
  Tenneco Inc.                           39,100         1,999
  Textron Inc.                           18,900         1,510
  Whitman Education Group Inc.           23,700           572
                                                   ----------
      Total                                            20,265
                                                   ----------
 
<CAPTION>
                                                     MARKET
                                                     VALUE
                                      SHARES        (000'S)
                                    -----------    ----------
<S>                                 <C>            <C>
DRUGS (3.3%)
  American Home Products Corporation    142,500    $    8,568
 *Amgen Inc.                             59,900         3,235
  Bristol-Myers Squibb Company          113,200        10,188
  Eli Lilly & Company                   124,000         8,060
  Merck & Co., Inc.                     276,400        17,862
  Pharmacia & Upjohn Inc.               114,730         5,091
  Pfizer Inc.                           143,500        10,242
  Schering-Plough Corporation            83,000         5,208
  Warner-Lambert Company                 61,100         3,360
                                                   ----------
      Total                                            71,814
                                                   ----------
ELECTRICAL EQUIPMENT (2.0%)
  Emerson Electric Co.                   50,500         4,564
  General Electric Company              374,300        32,377
  W.W. Grainger, Inc.                    11,500           891
  Honeywell Inc.                         28,600         1,559
  Raychem Corp.                          10,000           719
  Thomas & Betts Corporation              9,000           337
  Westinghouse Electric
    Corporation                          93,900         1,761
  Whirlpool Corporation                  16,700           829
                                                   ----------
      Total                                            43,037
                                                   ----------
ELECTRONICS (1.1%)
 *Advanced Micro Devices, Inc.           30,400           414
  AMP Incorporated                       48,936         1,964
 *Applied Materials Inc.                 40,400         1,232
  Intel Corp.                           184,900        13,579
 *LSI Logic Corp.                        28,900           751
  Micron Technology                      46,800         1,211
 *National Semiconductor Corporation     30,500           473
  Perkin-Elmer Corporation                9,700           468
  Tektronix, Inc.                         7,400           331
  Texas Instruments Incorporated         42,700         2,130
  Tyco International Ltd.                34,300         1,398
                                                   ----------
      Total                                            23,951
                                                   ----------
ENVIRONMENTAL CONTROL (0.3%)
  Browning-Ferris Industries Inc.        47,900         1,389
  Laidlaw Transportation Limited         66,200           670
  WMX Technologies, Inc.                111,300         3,645
                                                   ----------
      Total                                             5,704
                                                   ----------
FEDERAL GOVERNMENT AGENCY RELATED (0.5%)
  Federal Home Loan Mortgage Corp.       40,300         3,446
  Federal National Mortgage Assoc.      245,900         8,238
                                                   ----------
      Total                                            11,684
                                                   ----------
FINANCIAL SERVICES (1.2%)
  H.F. Ahmanson & Company                26,000           702
  Alexander & Alexander Services         10,000           197
  American Express Company              108,800         4,855
  Beneficial Corporation                 12,000           673
  Dean Witter, Discover & Co.            37,550         2,150
  Golden West Financial
    Corporation                          13,300           745
  Great Western Financial Corporation    30,800           735
  Green Tree Financial Corp.             30,800           962
  Household International Inc.           21,900         1,664
  MBNA Corp.                             50,125         1,429
</TABLE>
 
                                       67
<PAGE>   71
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                               BALANCED PORTFOLIO
                            SCHEDULE OF INVESTMENTS
                                 JUNE 30, 1996
<TABLE>
<CAPTION>
                                                     MARKET
                                                     VALUE
                                      SHARES        (000'S)
                                    -----------    ----------
<S>                                 <C>            <C>
COMMON STOCK (CONTINUED)
FINANCIAL SERVICES (CONTINUED)
  Marsh & McLennan Companies, Inc.       16,400    $    1,583
  Merrill Lynch & Co.                    38,600         2,514
  Morgan Stanley Group Inc.              34,400         1,690
  Salomon Inc.                           23,700         1,043
  Transamerica Corporation               15,300         1,239
  Travelers Group Inc.                  106,770         4,871
                                                   ----------
      Total                                            27,052
                                                   ----------
FOOD SERVICE/LODGING (0.6%)
  Darden Restaurant Inc.                 35,900           386
 *Harrahs Entertainment                  23,100           653
  Hilton Hotels Corporation              11,000         1,237
 *ITT Corp.                              26,400         1,749
  Luby's Cafeterias, Inc.                 5,300           125
  Marriott International                 28,700         1,543
  McDonald's Corporation                157,700         7,372
 *Ryan's Family Steak Houses,
    Inc.                                 11,800           109
 *Shoney's Inc.                           9,400           102
  Wendy's International, Inc.            28,600           533
                                                   ----------
      Total                                            13,809
                                                   ----------
FOODS (1.6%)
  Archer Daniels Midland Company        117,084         2,239
  CPC International Corp.                32,800         2,362
  Campbell Soup Company                  56,200         3,962
  ConAgra Inc.                           54,700         2,482
  General Mills, Inc.                    35,900         1,957
  H.J. Heinz Company                     83,250         2,529
  Hershey Foods Corp.                    17,400         1,277
  Kellogg Company                        47,900         3,509
  Pioneer Hi-Bred International          18,700           989
  Quaker Oats Company                    30,400         1,037
  Ralston Purina Group                   23,900         1,533
  Sara Lee Corporation                  109,000         3,529
  Unilever, N.V.                         36,000         5,224
  Wm. Wrigley Jr. Company                26,200         1,323
                                                   ----------
      Total                                            33,952
                                                   ----------
HOSPITAL SUPPLIES (1.6%)
  Abbott Laboratories Inc.              177,000         7,699
  Allergan Incorporated                  14,600           573
  Allergan Incorporated-Rights              463             0
  C.R. Bard, Inc.                        12,800           435
  Bausch & Lomb Inc.                     12,800           544
  Baxter International Inc.              61,200         2,892
  Becton, Dickinson & Company            14,400         1,156
 *Biomet, Inc.                           26,000           374
 *Boston Scientific Corp.                40,100         1,804
  Johnson & Johnson                     300,000        14,850
  Mallinckrodt Group                     16,700           649
  Medtronic, Incorporated                52,700         2,951
  Millipore Corp.                        10,000           419
 *St. Jude Medical, Inc.                 18,050           605
  U.S. Surgical Corporation              13,900           431
                                                   ----------
      Total                                            35,382
                                                   ----------
HOUSEHOLD FURNITURE (0.2%)
  Armstrong World Industries,
    Inc.                                  8,300           478
  Black & Decker Corporation             19,700           761
  Maytag Corporation                     23,700           495
  Newell Co.                             35,700         1,093
 
<CAPTION>
                                                     MARKET
                                                     VALUE
                                      SHARES        (000'S)
                                    -----------    ----------
<S>                                 <C>            <C>
HOUSEHOLD FURNITURE (CONTINUED)
  Rubbermaid, Inc.                       34,100    $      929
  The Stanley Works                      19,900           592
                                                   ----------
      Total                                             4,348
                                                   ----------
INSURANCE (1.6%)
  Aetna Life & Casualty Company          25,900         1,852
  Allstate Corporation                  100,147         4,569
  American General Corporation           46,700         1,699
  American International Group,
    Inc.                                106,550        10,508
  Aon Corporation                        24,400         1,238
  CIGNA Corporation                      17,200         2,027
  The Chubb Corporation                  39,500         1,970
  General Re Corporation                 18,300         2,786
  ITT Hartford Group                     26,400         1,406
  Jefferson-Pilot Corp.                  16,050           829
  Lincoln National Corporation           23,500         1,087
  Providian Corporation                  21,100           905
  SAFECO Corp.                           28,400         1,005
  St. Paul Companies, Inc.               18,900         1,011
  Torchmark Corporation                  16,200           709
  UNUM Corporation                       16,500         1,027
  USF&G Corp.                            26,900           440
  USLIFE Corporation                      7,750           255
                                                   ----------
      Total                                            35,323
                                                   ----------
LEISURE RELATED (1.0%)
 *Bally Entertainment Corporation        11,300           311
  Brunswick Corporation                  22,100           442
  Comcast Corp.                          53,950           998
  Walt Disney Company                   152,736         9,603
  Fleetwood Enterprises, Inc.            10,300           319
  Hasbro Inc.                            19,600           701
 *King World Productions, Inc.            8,400           306
  Mattel, Inc.                           62,360         1,785
  Outboard Marine Corporation             4,500            82
 *Tele Communications, Inc.             147,000         2,664
 *U S West Media Group                  106,300         1,940
 *Viacom Incorporated                    83,256         3,164
                                                   ----------
      Total                                            22,315
                                                   ----------
MACHINERY (0.8%)
  Briggs & Stratton Corporation           6,500           267
  Case Corporation                       16,300           782
  Caterpillar Inc.                       43,700         2,961
  Cincinnati Milacron Inc.                9,000           216
  Cooper Industries, Inc.                24,300         1,008
  Crane Co.                               6,800           279
  Cummins Engine Company, Inc.            9,000           363
  Deere & Company                        59,100         2,364
  Dover Corporation                      25,600         1,181
  Fluor Corporation                      18,800         1,229
  Foster Wheeler Corporation              9,100           408
  General Signal Corporation             11,200           424
  Giddings & Lewis Company                7,800           127
  Harnischfeger Industries, Inc.         10,600           352
  Illinois Tool Works Inc.               26,800         1,812
  Ingersoll-Rand Company                 24,600         1,076
  Johnson Controls Inc.                   9,300           646
  Pall Corporation                       25,866           624
  Parker-Hannifin Corporation            16,700           708
</TABLE>
 
                                       68
<PAGE>   72
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                               BALANCED PORTFOLIO
                            SCHEDULE OF INVESTMENTS
                                 JUNE 30, 1996
<TABLE>
<CAPTION>
                                                     MARKET
                                                     VALUE
                                      SHARES        (000'S)
                                    -----------    ----------
<S>                                 <C>            <C>
COMMON STOCK (CONTINUED)
MACHINERY (CONTINUED)
  Timken Company                          7,100    $      275
  TRINOVA Corp.                           6,400           214
 *Varity Corporation                      8,900           428
                                                   ----------
      Total                                            17,744
                                                   ----------
MEDICAL SERVICES (0.6%)
 *Beverly Enterprises, Inc.              22,500           270
  Columbia/HCA Healthcare Corporation   100,800         5,380
 *Community Psychiatric Centers           9,800            93
  Humana, Inc.                           36,500           652
  Manor Care, Inc.                       14,100           555
 *Tenet Healthcare Corp.                 48,500         1,037
  United Healthcare Corp.                41,000         2,070
  U.S. HealthCare Incorporated           34,700         1,908
                                                   ----------
      Total                                            11,965
                                                   ----------
METALS & MINING (0.7%)
  Alcan Aluminum Limited                 50,900         1,552
  Aluminum Co. of America                39,600         2,272
  ASARCO, Inc.                            9,600           265
  Barrick Gold Corporation               80,400         2,181
  Cyprus Amex Minerals Co.               20,900           473
  Echo Bay Mines Limited Co.             29,400           316
  Freeport-McMoRan Copper & Gold Inc.    43,900         1,399
  Homestake Mining Company               33,000           565
  Inco Limited                           26,400           851
  Newmont Mining Corporation             22,389         1,105
  Phelps Dodge Corporation               14,900           929
  Placer Dome Incorporated               53,800         1,284
  Reynolds Metals Company                14,300           745
  Santa Fe Pacific Gold Corp.            29,640           419
                                                   ----------
      Total                                            14,356
                                                   ----------
OFFICE EQUIPMENT-SERVICES (1.6%)
  Autodesk, Inc.                         10,400           311
  Automatic Data Processing, Inc.        65,200         2,518
  Computer Associates International Inc. 54,450         3,880
 *Computer Sciences Corp.                12,600           942
  First Data Corporation                 50,300         4,005
 *Microsoft Corporation                 133,700        16,061
 *Novell, Inc.                           82,300         1,142
 *Oracle Corporation                    147,300         5,809
  Shared Medical Systems Corp.            5,200           334
                                                   ----------
      Total                                            35,002
                                                   ----------
OIL & GAS-DOMESTIC (0.8%)
  Amerada Hess Corporation               20,900         1,121
  Ashland Oil, Inc.                      14,400           571
  Atlantic Richfield Company             36,200         4,290
  Coastal Corp.                          23,700           989
  Kerr-McGee Corporation                 11,300           688
  Louisiana Land & Exploration Co.        7,600           438
  Occidental Petroleum Corporation       71,900         1,780
 *Oryx Energy Company                    23,500           382
  Pennzoil Company                       10,500           486
  Phillips Petroleum Company             59,000         2,471
 *Santa Fe Energy Resources, Inc.        20,300           241
  Sun Company, Inc.                      16,600           504
  USX-U S Steel Group Inc.               18,800           533
  Unocal Corp.                           55,700         1,880
                                                   ----------
 
<CAPTION>
                                                     MARKET
                                                     VALUE
                                      SHARES        (000'S)
                                    -----------    ----------
<S>                                 <C>            <C>
OIL & GAS-DOMESTIC (CONTINUED)
      Total                                        $   16,374
                                                   ----------
OIL & GAS-INTERNATIONAL (3.4%)
  Amoco Company                         111,800         8,092
  Chevron Corp.                         147,000         8,673
  Exxon Corporation                     279,700        24,299
  Mobil Corporation                      88,800         9,957
  Royal Dutch Petroleum Co., ADR        120,700        18,558
  Texaco Inc.                            59,500         4,991
                                                   ----------
      Total                                            74,570
                                                   ----------
OIL FIELD SERVICES (0.4%)
  Baker Hughes, Inc.                     32,100         1,055
  Dresser Industries, Inc.               40,900         1,207
  Halliburton Company                    25,800         1,432
  Helmerich & Payne, Inc.                 5,600           205
  McDermott International, Inc.          12,300           257
 *Rowan Companies, Inc.                  19,100           282
  Schlumberger Limited                   54,700         4,608
 *Western Atlas International
    Inc.                                 12,000           699
                                                   ----------
      Total                                             9,745
                                                   ----------
PAPER (0.5%)
  International Paper Company            67,200         2,478
  James River Corp. of Virginia          19,100           504
  Kimberly-Clark Corporation             63,266         4,887
  Mead Corp.                             11,900           617
  Stone Container Corporation            22,300           307
  Temple-Inland Inc.                     12,500           584
  Union Camp Corporation                 15,600           761
  Westvaco Corporation                   22,850           683
  Willamette Industries Inc.             12,400           738
                                                   ----------
      Total                                            11,559
                                                   ----------
PHOTO & OPTICAL (0.3%)
  Eastman Kodak Company                  77,900         6,057
  Polaroid Corporation                   10,300           470
                                                   ----------
      Total                                             6,527
                                                   ----------
PRINTING & PUBLISHING (0.8%)
  American Greetings Corp.               16,800           460
  Deluxe Corp.                           18,600           660
  R.R. Donnelley & Sons Company          34,700         1,210
  Dow Jones & Company, Inc.              21,900           914
  Dun & Bradstreet Corporation           38,300         2,394
  Gannett Company Inc.                   31,700         2,243
  Harcourt General                       16,000           800
  The John H. Harland Company             6,900           170
  Jostens, Inc.                           8,700           172
  Knight-Ridder Inc.                     11,000           797
  Mcgraw-Hill Companies Inc.             22,600         1,034
  Meredith Corporation                    6,200           259
  New York Times Company                 22,000           718
  Time Warner Inc.                       88,400         3,470
  Times Mirror Company                   23,600         1,027
  Tribune Company                        13,900         1,009
                                                   ----------
      Total                                            17,337
                                                   ----------
PROFESSIONAL SERVICES (0.3%)
 *Alza Corp.                             19,000           520
  H & R Block, Inc.                      23,300           760
 *CUC International Inc.                 42,850         1,521
</TABLE>
 
                                       69
<PAGE>   73
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                               BALANCED PORTFOLIO
                            SCHEDULE OF INVESTMENTS
                                 JUNE 30, 1996
<TABLE>
<CAPTION>
                                                     MARKET
                                                     VALUE
                                      SHARES        (000'S)
                                    -----------    ----------
<S>                                 <C>            <C>
COMMON STOCK (CONTINUED)
PROFESSIONAL SERVICES (CONTINUED)
  Ecolab, Inc.                           14,500    $      478
  Interpublic Group of Cos. Inc.         17,800           834
  National Service Industries,
    Inc.                                 10,800           423
  Ogden Corporation                      11,200           203
  Safety-Kleen Corp.                     13,000           228
  Service Corporation
    International                        26,400         1,518
                                                   ----------
      Total                                             6,485
                                                   ----------
RAILROADS (0.5%)
  Burlington Northern Santa Fe           34,233         2,769
  CSX Corporation                        47,600         2,297
  Conrail Incorporated                   17,600         1,168
  Norfolk Southern Corporation           28,700         2,432
  Union Pacific Corporation              46,300         3,235
                                                   ----------
      Total                                            11,901
                                                   ----------
RETAIL-FOOD (0.4%)
  Albertson's, Inc.                      56,700         2,346
  American Stores Co.                    33,700         1,390
  Fleming Companies, Inc.                 8,500           122
  Giant Food Inc.                        13,400           481
  Great Atlantic & Pacific Tea
    Co., Inc.                             8,600           283
 *The Kroger Company                     28,000         1,106
  Supervalue Inc.                        15,200           479
  Sysco Corporation                      40,900         1,401
  Winn-Dixie Stores, Inc.                34,200         1,210
                                                   ----------
      Total                                             8,818
                                                   ----------
RETAIL-GENERAL (2.3%)
 *Charming Shoppes Incorporated          23,200           164
  Circuit City Stores, Inc.              22,000           795
  Dayton Hudson Corporation              16,200         1,671
  Dillard Department Stores, Inc.        25,500           931
 *Federated Department Stores,
    Inc.                                 46,700         1,594
  The Gap, Inc.                          64,900         2,085
  Home Depot, Inc.                      107,666         5,814
  K Mart Corporation                    108,200         1,339
  The Limited Inc.                       61,000         1,311
  Longs Drug Stores Corp.                 4,500           201
  Lowe's Companies, Inc.                 36,300         1,311
  May Department Stores Company          56,300         2,463
  Melville Corporation                   23,700           960
  Mercantile Stores Company               8,300           487
  Nordstrom, Inc.                        18,300           814
  J.C. Penney Company, Inc.              50,600         2,656
  Pep Boys - Manny, Moe & Jack           14,000           476
 *Price/Costco, Inc.                     44,051           953
  Rite Aid Corporation                   18,900           562
  Sears, Roebuck & Company               88,300         4,294
  TJX Companies, Inc.                    16,300           550
  Tandy Corporation                      13,600           644
 *Toys "R" Us                            61,600         1,756
  Wal-Mart Stores Inc.                  516,400        13,104
  Walgreen Company                       55,400         1,856
 *Woolworth Corp.                        30,000           675
                                                   ----------
      Total                                            49,466
                                                   ----------
SOAPS & TOILETRIES (1.2%)
  Alberto-Culver Company                  6,300           292
  Avon Products, Inc.                    30,200         1,363
 
<CAPTION>
                                                     MARKET
                                                     VALUE
                                      SHARES        (000'S)
                                    -----------    ----------
<S>                                 <C>            <C>
SOAPS & TOILETRIES (CONTINUED)
  Clorox Company                         11,700    $    1,037
  Colgate-Palmolive Co.                  33,000         2,797
  Gillette Company                      100,200         6,250
  International Flavors &
    Fragrances, Inc.                     25,000         1,191
  Procter & Gamble Company              154,400        13,992
                                                   ----------
      Total                                            26,922
                                                   ----------
STEEL (0.2%)
 *Armco Inc.                             23,900           119
 *Bethlehem Steel Corporation            25,000           297
  Inland Steel Industries, Inc.          11,000           216
  Nucor Corp.                            19,700           997
  USX-Marathon Group                     64,700         1,302
  Worthington Industries, Inc.           20,400           426
                                                   ----------
      Total                                             3,357
                                                   ----------
TELECOMMUNICATIONS (2.9%)
  AT&T Corporation                      361,800        22,432
 *Airtouch Communications               112,300         3,172
 *Andrew Corporation                     13,575           730
 *Bay Networks                           42,300         1,089
 *Cabletron Systems Inc.                 16,200         1,112
 *Cisco Systems Incorporated            128,000         7,248
 *DSC Communications Corp.               26,100           786
  MCI Communications Corporation        155,600         3,987
  Motorola, Inc.                        133,300         8,381
  Northern Telecom Limited               57,900         3,148
  Scientific-Atlanta, Inc.               17,200           267
  Sprint Corporation                     98,300         4,129
 *Tellabs Inc.                           20,000         1,338
 *3COM Corp.                             37,600         1,720
 *World Communications                   43,700         2,420
                                                   ----------
      Total                                            61,959
                                                   ----------
TOBACCO (1.1%)
  American Brands Inc.                   39,900         1,810
  Philip Morris Companies, Inc.         186,800        19,427
  UST Incorporated                       45,500         1,558
                                                   ----------
      Total                                            22,795
                                                   ----------
TRUCKING-SHIPPING (0.1%)
  Caliber System Inc.                     8,800           299
  Consolidated Freightways, Inc.          9,800           207
 *Federal Express Corp.                  12,800         1,050
  Ryder System, Inc.                     17,800           501
 *Yellow Corp.                            6,300            83
                                                   ----------
      Total                                             2,140
                                                   ----------
UTILITY-ELECTRIC (1.8%)
  American Electric Power Co. Inc.       42,000         1,790
  Baltimore Gas & Electric Co.           33,200           942
  Carolina Power & Light Company         34,200         1,300
  Central & South West Corporation       47,100         1,366
  Cinergy Corporation                    35,505         1,136
  Consolidated Edison Co. of New
    York                                 52,900         1,547
  DTE Energy Company                     32,700         1,010
  Dominion Resources Inc.                39,900         1,596
  Duke Power Company                     46,100         2,363
  Edison International                  100,300         1,768
  Entergy Corporation                    51,300         1,456
  FPL Group, Inc.                        41,400         1,904
</TABLE>
 
                                       70
<PAGE>   74
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                               BALANCED PORTFOLIO
                            SCHEDULE OF INVESTMENTS
                                 JUNE 30, 1996
<TABLE>
<CAPTION>
                                                     MARKET
                                      SHARES/        VALUE
                                        PAR         (000'S)
                                    -----------    ----------
<S>                                 <C>            <C>
COMMON STOCK (CONTINUED)
UTILITY-ELECTRIC (CONTINUED)
  General Public Utilities               27,100    $      955
  Houston Industries Incorporated        59,200         1,458
 *Niagara Mohawk Power
    Corporation                          32,500           252
  Northern States Power Company          15,400           760
  Ohio Edison Company                    34,400           752
  PECO Energy Company                    50,000         1,300
  P P & L Resources Inc.                 35,900           848
  Pacific Enterprises                    18,600           551
  Pacific Gas & Electric Company         93,800         2,181
  PacifiCorp                             66,100         1,471
  Public Service Enterprise Group,
    Inc.                                 55,100         1,508
  Southern Company                      151,000         3,718
  Texas Utilities Company                50,900         2,176
  UNICOM Corp.                           48,400         1,349
  Union Electric Company                 23,000           926
                                                   ----------
      Total                                            38,383
                                                   ----------
UTILITY-GAS (0.3%)
  Columbia Gas System Inc.               12,400           646
  Consolidated Natural Gas Company       21,100         1,102
  Enron Corp.                            56,600         2,314
  Nicor Inc.                             11,300           321
  Noram Energy Corporation               30,400           331
  ONEOK, Inc.                             6,100           152
  Peoples Energy Corporation              7,900           265
  Williams Companies Inc.                23,600         1,168
                                                   ----------
      Total                                             6,299
                                                   ----------
UTILITY-TELEPHONE (2.4%)
  ALLTEL Corporation                     42,700         1,313
  Ameritech Corporation                 125,100         7,428
  Bell Atlantic Corporation              98,600         6,286
  Bellsouth Corporation                 223,900         9,488
  GTE Corporation                       219,600         9,827
  NYNEX Corp.                            98,300         4,669
  Pacific Telesis Group                  96,500         3,257
  SBC Communications Incorporated       137,200         6,757
  U S West Inc.                         106,800         3,404
                                                   ----------
      Total                                            52,429
                                                   ----------
      Total Common Stock                            1,140,314
                                                   ----------
PREFERRED STOCK (0.0%)
DIVERSIFIED (0.0%)
  Teledyne, Inc.                            641    $       10
                                                   ----------
      Total Preferred Stock                                10
                                                   ----------
BONDS (30.1%)
AIRLINES (0.3%)
  Delta Air Lines Inc, 9 3/4%,
    5/19/03                         $   532,000    $      588
  Delta Air Lines Inc, 9 3/4%,
    6/1/03                            3,513,000         3,885
  Delta Air Lines Inc, 9 3/4,
    6/1/03                              870,000           962
  Delta Air Lines Inc, 9 3/4,
    6/1/03                              870,000           962
                                                   ----------
      Total                                             6,397
                                                   ----------
AUTO RELATED (0.2%)
  Hertz Corp., 9.04%, 6/14/00         4,100,000         4,398
                                                   ----------
BANKS (0.5%)
  Natwest Capital Corporation,
    12 1/8%, 11/15/02                10,450,000        11,159
                                                   ----------
<CAPTION>
                                                     MARKET
                                                     VALUE
                                        PAR         (000'S)
                                    -----------    ----------
<S>                                 <C>            <C>
BEVERAGES (0.6%)
  Coca-Cola Enterprises Inc., 8%,
    1/4/05                           10,000,000        10,620
                                                   ----------
CHEMICALS (0.4%)
  Dow Capital B.V., 8 1/2%, 6/8/10    8,200,000    $    8,893
                                                   ----------
CMO & LOAN-BACKED CERTIFICATES 
 (5.3%)
  CIT RV Owner Trust, 6 1/4%,
    1/15/11                           5,272,042         5,237
  Eaglemark Trust, 6 3/4%,
    11/15/02 (144A)                  10,000,000        10,030
  Federal Home Loan Mortgage
    Corp.,
    7%, 7/1/25                        4,859,473         4,679
  Federal Home Loan Mortgage
    Corp.,
    7%, 7/1/25                        4,056,957         3,906
  Federal Home Loan Mortgage
    Corp.,
    7%, 7/1/25                        4,778,921         4,601
  Federal Home Loan Mortgage
    Corp.,
    7 1/4%, 4/15/18                  10,325,000        10,409
  Federal Home Loan Mortgage
    Corp.,
    7%, 3/15/07                       7,250,000         7,054
  Federal Home Loan Mortgage
    Corp.,
    6%, 7/15/07                      19,250,000        18,348
  Federal Home Loan Mortgage
    Corp.,
    7%, 7/1/25                       14,500,651        13,962
  Federal National Mortgage
    Assoc.,
    6 3/4%, 12/25/23                  6,500,000         5,811
  Ford Motor Credit Grantor Trust, 
    5.9%, 10/15/00                    5,569,911         5,549
  Hanson Overseas B.V., 6 3/4%,
    9/15/05                          10,000,000         9,590
  Premier Auto Trust, 6.65%,
    4/2/98                            6,930,000         6,973
  Rural Housing Trust, 6.33%,
    4/1/26                            9,101,722         8,791
                                                   ----------
      Total                                           114,940
                                                   ----------
FEDERAL GOVERNMENT AND AGENCIES 
 (12.8%)
  Government National Mortgage 
    Assoc., 7%, 9/15/23                 109,224           105
  Government National Mortgage 
    Assoc., 7%, 10/15/23                203,644           197
  Government National Mortgage 
    Assoc., 7 1/2%, 8/15/24             935,507           922
  Government National Mortgage 
    Assoc., 7%, 9/15/23                  24,591            24
  Government National Mortgage 
    Assoc., 7%, 7/15/23                 784,937           758
  Government National Mortgage 
    Assoc., 7%, 5/15/23               8,984,533         8,673
  Government National Mortgage 
    Assoc., 7%, 5/15/23               6,369,117         6,148
  Government National Mortgage 
    Assoc., 7%, 6/15/23                 326,857           316
  Government National Mortgage 
    Assoc., 7%, 10/15/23                 28,702            28
  Government National Mortgage 
    Assoc., 7%, 5/15/23                 205,436           198
  Government National Mortgage 
    Assoc., 7 1/2%, 1/15/24             210,213           207
  Government National Mortgage 
    Assoc., 7%, 7/15/23                 750,877           725
</TABLE>
 
                                       71
<PAGE>   75
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                               BALANCED PORTFOLIO
                            SCHEDULE OF INVESTMENTS
                                 JUNE 30, 1996
<TABLE>
<CAPTION>
                                                     MARKET
                                                     VALUE
                                        PAR         (000'S)
                                    -----------    ----------
<S>                                 <C>            <C>
BONDS (CONTINUED)
FEDERAL GOVERNMENT AND AGENCIES (CONTINUED)
  Government National Mortgage Assoc., 8 1/2%,
    2/15/25                        123,619         $      127
  Government National Mortgage Assoc., 7%,
    8/15/23                           29,173               28
  Government National Mortgage Assoc., 8 1/2%,
    7/15/24                        201,861                208
  Government National Mortgage Assoc., 7%,
    6/15/23                          705,882              681
  Government National Mortgage Assoc., 7%,
    7/15/23                           64,437               62
  Government National Mortgage Assoc., 7%,
    10/15/23                         148,127              143
  Government National Mortgage Assoc., 7%,
    9/15/23                          666,332              643
  Government National Mortgage Assoc., 7 1/2%,
    5/15/24                        986,587                973
  Government National Mortgage Assoc., 7%,
    10/15/23                         121,324              117
  Government National Mortgage Assoc., 7 1/2%,
    1/15/24                      1,073,950              1,059
  Government National Mortgage Assoc., 7%,
    11/15/23                         796,791              769
  Government National Mortgage Assoc., 7%,
    11/15/23                         799,538              772
  Government National Mortgage Assoc., 8 1/2%,
    2/15/25                         16,397                 17
  Government National Mortgage Assoc., 7%,
    11/15/23                         582,010              562
  Government National Mortgage Assoc., 7%,
    9/15/23                           35,076               34
  Government National Mortgage Assoc., 8 1/2%,
    7/15/24                        218,919                225
  Government National Mortgage Assoc., 8 1/2%,
    4/15/26                        945,447                973
  Government National Mortgage Assoc., 7%,
    10/15/23                         106,303              103
  Government National Mortgage Assoc., 8 1/2%,
    11/15/24                       184,399                190
  Government National Mortgage Assoc., 8 1/2%,
    1/15/25                         18,727                 19
  Government National Mortgage Assoc., 7 1/2%,
    11/15/24                       996,381                982
  Government National Mortgage Assoc., 7 1/2%,
    2/15/24                      1,614,812              1,592
  Government National Mortgage Assoc., 7 1/2%,
    3/15/24                      1,464,393              1,444
  Government National Mortgage Assoc., 7 1/2%,
    8/15/24                        977,376                964
  Government National Mortgage Assoc., 8 1/2%,
    3/15/26                         25,483                 26
  Government National Mortgage Assoc., 8 1/2%,
    1/15/26                        848,578                874
  Government National Mortgage Assoc., 7 1/2%,
    5/15/24                      1,357,032              1,338
  Government National Mortgage Assoc., 7 1/2%,
    4/15/24                        920,363                907
  Government National Mortgage Assoc., 7 1/2%,
    5/15/24                      1,391,376              1,372
  Government National Mortgage Assoc., 8 1/2%,
    6/15/24                         23,924                 25
 
<CAPTION>
                                                     MARKET
                                                     VALUE
                                        PAR         (000'S)
                                    -----------    ----------
<S>                                 <C>            <C>
FEDERAL GOVERNMENT AND AGENCIES (CONTINUED)
  Government National Mortgage Assoc., 8 1/2%,
    1/15/25                         53,685         $       55
  Government National Mortgage Assoc., 7 1/2%,
    6/15/24                      1,422,921              1,403
  Government National Mortgage Assoc., 7 1/2%,
    8/15/24                        984,683                971
  Government National Mortgage Assoc., 8 1/2%,
    1/15/25                        119,134                123
  Government National Mortgage Assoc., 7 1/2%,
    8/15/24                      1,235,062              1,218
  Government National Mortgage Assoc., 8 1/2%,
    8/15/24                        191,563                197
  Government National Mortgage Assoc., 7 1/2%,
    6/15/24                         36,926                 36
  Government National Mortgage Assoc., 8 1/2%,
    5/15/26                        926,653                954
  Government National Mortgage Assoc., 8 1/2%,
    5/15/26                        915,374                943
  Government National Mortgage Assoc., 8 1/2%,
    5/15/26                        803,344                822
  Government National Mortgage Assoc., 8 1/2%,
    9/15/24                        321,778                331
  Government National Mortgage Assoc., 8 1/2%,
    4/15/26                        151,451                156
  Government National Mortgage Assoc., 8 1/2%,
    2/15/25                         42,980                 44
  Government National Mortgage Assoc., 8 1/2%,
    12/15/24                        26,005                 27
  Government National Mortgage Assoc., 8 1/2%,
    2/15/25                         44,263                 46
  Government National Mortgage Assoc., 8 1/2%,
    1/15/26                         27,123                 28
  Government National Mortgage Assoc., 7%,
    1/15/26                        7,250,158            6,999
  Government National Mortgage Assoc., 8 1/2%,
    3/15/26                         25,398                 26
  Government National Mortgage Assoc., 8 1/2%,
    1/15/26                         62,806                 65
  Government National Mortgage Assoc., 8 1/2%,
    2/15/26                         45,829                 47
  Government National Mortgage Assoc., 8 1/2%,
    5/15/26                        463,983                478
  Government National Mortgage Assoc., 8 1/2%,
    4/15/26                      1,008,267              1,038
  Government National Mortgage Assoc., 8 1/2%,
    4/15/26                        100,328                103
  Government National Mortgage Assoc., 8 1/2%,
    4/15/26                      1,005,900              1,036
  Government National Mortgage Assoc., 8 1/2%,
    4/15/26                         92,015                 95
  Government National Mortgage Assoc., 8 1/2,
    5/15/26                           39,479               41
  Government National Mortgage Assoc., 8 1/2%,
    5/15/26                        906,063                933
  Government National Mortgage Assoc., 8 1/2,
    9/15/22                           16,474               17
  Government National Mortgage Assoc., 8 1/2%,
    10/15/22                       244,486                252
  Government National Mortgage Assoc., 7%,
    5/15/23                          458,621              443
</TABLE>
 
                                       72
<PAGE>   76
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                               BALANCED PORTFOLIO
                            SCHEDULE OF INVESTMENTS
                                 JUNE 30, 1996
<TABLE>
<CAPTION>
                                                     MARKET
                                                     VALUE
                                        PAR         (000'S)
                                    -----------    ----------
<S>                                 <C>            <C>
BONDS (CONTINUED)
FEDERAL GOVERNMENT AND 
 AGENCIES (CONTINUED)
  Government National Mortgage 
    Assoc., 8 1/2%, 9/15/21             185,298    $      191
  Government National Mortgage                    
    Assoc., 8 1/2%, 7/15/21             176,618           182
  Government National Mortgage                    
    Assoc., 8 1/2%, 5/15/22               9,509            10
  Government National Mortgage                    
    Assoc., 8 1/2%, 10/15/22             12,019            12
  Government National Mortgage                    
    Assoc., 8 1/2%, 9/15/22             198,398           204
  Government National Mortgage                    
    Assoc., 8 1/2%, 10/15/22             51,732            53
  Government National Mortgage                    
    Assoc., 8 1/2%, 12/15/22             54,472            56
  Government National Mortgage                    
    Assoc., 8 1/2%, 11/15/25             25,804            27
  U.S. Treasury, 7 1/8%, 2/15/23     27,500,000        27,775
  U.S. Treasury, 7 5/8%, 2/15/25     22,500,000        24,258
  U.S. Treasury, 7 1/4%, 8/15/04     16,000,000        16,565
  U.S. Treasury, 6 3/4%, 4/30/00     18,000,000        18,191
  U.S. Treasury, 5 3/4%, 10/31/00    21,150,000        20,595
  U.S. Treasury, 5%, 2/15/99        100,000,000        97,032
  U.S. Treasury, 6 7/8%, 5/15/06      9,000,000         9,098
  U.S. Treasury Strips, 0%,
    5/15/09                          22,000,000         9,074
                                                   ----------
      Total                                           277,780
                                                   ----------
FINANCE COMPANIES (0.6%)
  Associates Corp. of North
    America,
    7.95%, 2/15/10                    5,550,000         5,897
  Avco Financial Services Inc.,
    5 7/8%, 10/15/97                  6,800,000         6,773
                                                   ----------
      Total                                            12,670
                                                   ----------
FINANCIAL SERVICES (1.5%)
  Beneficial Corp., 6.86%,
    11/19/97                          7,800,000         7,867
  Beneficial Corp., 9 3/8%,
    7/28/97                           5,000,000         5,168
  Electronic Data Systems Corp.,
    8.8%, 03/01/21                    6,500,000         7,276
  General Motors Acceptance Corp.,
    6 5/8%, 10/1/02                  12,200,000        11,897
                                                   ----------
      Total                                            32,208
                                                   ----------
FOODS (0.5%)
  Nabisco Inc., 8%, 1/15/00           3,500,000         3,621
  RJR Nabisco Inc., 8 5/8%,
    12/1/02                           8,000,000         8,117
                                                   ----------
      Total                                            11,738
                                                   ----------
FOREIGN GOVERNMENT BONDS (0.2%)
  Province of Quebec, 7 1/8%,
    2/9/24                            5,000,000         4,577
                                                   ----------
LEISURE RELATED (0.9%)
  Tele Communications, Inc.,
    7 3/8%, 2/15/00                   8,000,000         7,899
  Tele Communications, Inc.,
    7 1/8%, 8/1/05                    4,250,000         3,933
  Time Warner Entertainment Inc.,
    8 7/8%, 10/1/12                   1,500,000         1,549
  Time Warner Entertainment Inc.,
    7 1/4%, 9/1/08                    6,500,000         6,090
                                                   ----------
      Total                                            19,471
                                                   ----------
 
<CAPTION>
                                                     MARKET
                                                     VALUE
                                        PAR         (000'S)
                                    -----------    ----------
<S>                                 <C>            <C>
MUNICIPAL BONDS (0.1%)
  Government Trust Certificates,
    8%, 5/15/98                       2,083,649    $    2,125
                                                   ----------
OFFICE EQUIPMENT (0.3%)
  International Business Machines
    Corp., 6 3/8%, 11/1/97            7,000,000         7,018
                                                   ----------
PRINTING & PUBLISHING (0.8%)
  News America Holdings Inc.,
    7 1/2%, 3/1/00                    6,500,000         6,609
  News America Holdings Inc.,
    8.45%, 8/1/34                    10,000,000        10,576
                                                   ----------
      Total                                            17,185
                                                   ----------
REAL ESTATE INVESTMENT TRUSTS (0.4%)
  Security Capital Industrial
    Trust, 7.3%, 5/15/01              8,000,000         7,922
                                                   ----------
RETAIL-GENERAL (0.3%)
  Dayton Hudson Corporation, 8.6%,
    1/15/12                           6,000,000         6,481
                                                   ----------
TOBACCO (0.2%)
  Philip Morris Companies, 9 1/4%,
    2/15/00                           2,100,000         2,263
  Philip Morris Companies, 7 1/4%,
    1/15/03                           3,000,000         2,999
                                                   ----------
      Total                                             5,262
                                                   ----------
UTILITY-ELECTRIC (3.9%)
  Atlantic City Electric Company,
    6 5/8%, 8/1/13                    4,000,000         3,572
  Cleveland Electric Illuminating
    Co., 7 3/8%, 6/1/03               4,000,000         3,617
  Dayton Power & Light Company,
    8.15%, 1/15/26                    5,750,000         5,868
  Korea Electric Power
    Corporation, 7 3/4%, 4/1/13       3,000,000         2,961
  Long Island Lighting Co.,
    9 5/8%, 7/1/24                    1,500,000         1,499
  Pacific Gas & Electric Co.,
    7 1/4%, 3/1/26                    9,050,000         8,247
  Pacific Gas & Electric Co.,
    5 3/8%, 8/1/98                    5,000,000         4,891
  Pacific Gas & Electric Co.,
    7 1/4%, 8/1/26                    6,400,000         5,856
  PECO Energy Company, 7 1/2%,
    1/15/99                           4,250,000         4,329
  PECO Energy Company, 7 3/4%,
    3/1/23                            8,850,000         8,559
  Public Service Electric & Gas
    Co., 6 1/8%, 8/1/02               9,000,000         8,538
  Southern California Edison Co.,
    7 1/4%, 3/1/26                   10,000,000         9,225
  Texas Utilities Electric Co.,
    7 7/8%, 3/1/23                    7,750,000         7,510
  UNICOM Corp., 6 1/2%, 4/15/00      10,600,000        10,398
                                                   ----------
      Total                                            85,070
                                                   ----------
</TABLE>
 
                                       73
<PAGE>   77
 
                     NORTHWESTERN MUTUAL SERIES FUND, INC.
                               BALANCED PORTFOLIO
                            SCHEDULE OF INVESTMENTS
                                 JUNE 30, 1996
<TABLE>
<CAPTION>
                                                     MARKET
                                                     VALUE
                                        PAR         (000'S)
                                    -----------    ----------
<S>                                 <C>            <C>
BONDS (CONTINUED)
UTILITY-GAS (0.3%)
  Columbia Gas System Inc., 7.32%,
    11/28/10                          7,571,000    $    7,243
                                                   ----------
      Total Bonds                                     653,157
                                                   ----------
MONEY MARKET INVESTMENTS (17.4%)
AUTO (0.4%)
  Ford Motor Credit Company,
    5 5/8%, 3/3/97                  $ 9,000,000    $    8,980
                                                   ----------
DRUGS (2.1%)
  American Home Products Corporation,
    5.31%, 7/10/96                   21,000,000        20,966
  American Home Products Corporation,
    5.33%, 7/15/96                   25,000,000        24,941
                                                   ----------
      Total                                            45,907
                                                   ----------
FEDERAL GOVERNMENT AND AGENCIES (2.7%)
 +U.S. Treasury, 4.99%, 8/22/96       4,000,000         3,968
  U.S. Treasury, 6 7/8%, 10/31/96    25,000,000        25,125
  U.S. Treasury, 7 1/2%, 1/31/97     30,000,000        30,328
                                                   ----------
      Total                                            59,421
                                                   ----------
FINANCE COMPANIES (1.7%)
  Associates Corp. of North
    America, 6 7/8%, 1/15/97          7,800,000         7,844
  Commercial Credit Group Inc.,
    5.29%, 7/3/96                    29,000,000        28,983
                                                   ----------
      Total                                            36,827
                                                   ----------
FINANCIAL SERVICES (4.1%)
  American General Finance Corporation,
    5.27%, 8/15/96                   25,000,000        24,819
  CIT Group, 5.39%, 8/30/96          21,000,000        20,802
  General Electric Capital
    Corporation,
    5.39%, 9/11/96                   22,400,000        22,149
 
<CAPTION>
                                                     MARKET
                                                     VALUE
                                        PAR         (000'S)
                                    -----------    ----------
<S>                                 <C>            <C>
FINANCIAL SERVICES (CONTINUED)
  General Motors Acceptance Corp.,
    8 3/8%, 5/1/97                    3,000,000    $    3,053
  Transamerica Financial Corp.,
    5.31%, 8/14/96                   18,381,000        18,253
                                                   ----------
      Total                                            89,076
                                                   ----------
LEISURE RELATED (0.9%)
 +Walt Disney Company, 5.2%,
    9/16/96                          20,000,000        19,761
                                                   ----------
OFFICE EQUIPMENT (2.2%)
  IBM Credit Corporation, 5.35%,
    7/15/96                          21,600,000        21,549
 +Xerox Corporation, 5.29%,
    7/29/96                          25,400,000        25,287
                                                   ----------
      Total                                            46,836
                                                   ----------
RETAIL-GENERAL (1.2%)
  Sears Roebuck Acceptance Corp.,
    5.28%, 8/15/96                   25,000,000        24,819
                                                   ----------
TOBACCO (0.9%)
  Philip Morris Companies, 5.36%,
    7/22/96                          20,100,000        20,031
                                                   ----------
UTILITY-ELECTRIC (0.1%)
  Texas Utilities Electric Co.,
    9.39%, 11/21/96                     250,000           253
                                                   ----------
UTILITY-TELEPHONE (1.1%)
  Ameritech Corporation, 5.36%,
    8/28/96                          25,000,000        24,772
                                                   ----------
  Total Money Market Investments                      376,683
                                                   ----------
  Total Investments                                $2,170,164
                                                   ==========
</TABLE>
 
* Non-Income Producing
 
+ Partially or fully held by the custodian in a segregated account as collateral
  for open financial futures contracts. Information regarding open futures
  contracts as of June 30, 1996 is summarized below:
 
<TABLE>
<CAPTION>
                                                           UNREALIZED
                        NUMBER OF       EXPIRATION        APPRECIATION
       ISSUER           CONTRACTS          DATE             (000'S)
- --------------------    ---------     --------------     --------------
<S>                     <C>           <C>                <C>
S&P 500 Stock Index        116        September 1996          $433
</TABLE>
 
    The Accompanying Notes are an Integral Part of the Financial Statements
                       (Prepared from Unaudited Figures)
 
                                       74
<PAGE>   78

<TABLE>

VARIABLE LIFE   TRANSFER / ALLOCATION / DOLLAR COST AVERAGING   POLICYOWNER SERVICES

Insured                   Policy Number                       Date

- ------------------------  ----------------------------------  ----------------------    
GA#                       SA#                                 Business Number:
                                                              Home Number:

- ------------------------  ----------------------------------  ----------------------    
<S><C>
A TOTAL OF SIX DIVISIONS MAY BE ELECTED WITH A MINIMUM OF 10% IN EACH DIVISION.  THIS APPLIES TO EXISTING
ASSETS, FUTURE ALLOCATIONS AND DOLLAR COST AVERAGING.
1. REDISTRIBUTION OF EXISTING ASSETS:
   Complete this section if you want to redistribute the money already invested.  Future investments will
   continue to be allocated as they were prior to the transfer, unless section 2 is completed.
        INVESTMENT DIVISIONS            CHANGE TO
          Select Bond                   ________%
          International Equity          ________%
          Money Market                  ________%               3. DOLLAR COST AVERAGING (DCA): For VCL only          
          Balanced                      ________%                   Effective date for the first DCA transfer               
          Index 500 Stock               ________%                   -----------------------------------               
          Aggressive Growth Stock       ________%               ____ The month following the date this form is signed.
          High Yield Bond               ________%                    Must have assets in Money Market on that date.   
          Growth Stock                  ________%                    Choose Money Market in section 1 and Money Market
          Growth and Income Stock       ________%                    in section 2.                                    
                        Total           __100___%               ____ With the next Premium/Dividend deposit, choose   
                                                                     Money Market in section 2.                             
                                                                  
2. ALLOCATION OF FUTURE PREMIUM/DIVIDENDS:
                                                                How would you like the funds transferred?  Choose one:
      Complete this section to change where your
      future Premium/Dividends are invested.  
      Allocations of future investments will be                  ____ Option One: Transfer in monthly installments so at
      effective with the next Premium/Dividend                        year end, Money Market balance will be zero.
      deposit
                                                                ____ Option Two: Specified amount to be
                          ALLOCATION OF FUTURE                       transferred monthly of $_______________.
INVESTMENT DIVISIONS      PREMIUMS/DIVIDENDS

          Select Bond                   ________%                    Select Bond                   ________%
          International Equity          ________%                    International Equity          ________%
          Money Market                  ________%                    Balanced                      ________% 
          Balanced                      ________%                    Index 500 Stock               ________%
          Index 500 Stock               ________%                    Aggressive Growth Stock       ________%
          Aggressive Growth Stock       ________%                    High Yield Bond               ________%
          High Yield Bond               ________%                    Growth Stock                  ________%
          Growth Stock                  ________%                    Growth and Income Stock       ________%
          Growth and Income Stock       ________%                                                  __100___%
                                        __100___%                                                           

4. TERMINATION OF DOLLAR COST AVERAGING:
       /  / IMMEDIATELY       /  / NEXT POLICY ANNIVERSARY

5. SPECIAL INSTRUCTIONS:___________________________________________________________________________________________
___________________________________________________________________________________________________________________
                                        
6. EFFECTIVE DATE:
This asset transfer and/or allocation of future investments shall be effective on _________________ (insert specific 
future date if desired).  If no date is specified, or if this form is not received at NML's Home Office (see address 
on reverse side) on or prior to 3:00 p.m. Central time on that date, this transfer shall be effective on the date 
this  form is received (complete and   signed) at NML's Home Office.
7. SIGNATURE OF OWNER(S)/TRUSTEE REQUIRED (TITLE MUST BE INCLUDED):
                                                                       
_________________________________________________________________________           Date signed ____________________

_________________________________________________________________________           Date signed ____________________


</TABLE>

<PAGE>   79


                              ADDITIONAL INFORMATION


1. REDISTRIBUTION OF EXISTING ASSETS:  The Owner may transfer the assets
   invested for this policy to any of the Divisions, as long as these assets,
   following the transfer, are allocated among not more than six Divisions.
   Transfers may be made as often as twelve times in a policy year.
2. ALLOCATION OF FUTURE PREMIUM/DIVIDENDS:  Allocation of the first net annual
   premium will be allocated to the Money Market Division until the Initial
   Allocation Date.  On the Initial Allocation Date, amounts in the Money Market
   Division will be allocated in accordance with the application.
3. DOLLAR COST AVERAGING (DCA):  If DCA is chosen, Money Market must be one of
   the Divisions elected for future premium/dividend allocation.  A total of six
   Divisions may be elected between current and future assets and DCA.
4. TERMINATION OF DOLLAR COST AVERAGING (DCA):  Any assets still in the Money
   Market Division will remain, unless you elect to transfer them.

                            HOW TO SUBMIT THIS FORM

FIRST CLASS MAIL
Please mail form to Northwestern Mutual Life, 720 E. Wisconsin, WI  53202,
Attention POS

FAX
The properly completed and signed form may be FAXed to the Home Office at the
numbers provided.  Fax telephone numbers listed by POS Regions are:

                East  414-299-4268              Central  414-299-4982
                West  414-299-4268              South    414-299-3382
                EPS   414-299-5123              
The original form is NOT needed.  Please keep for your records.


LINK
NML Agents only:  If timing is critical and FAX equipment is unavailable, this
request may be LINKed to the Home Office.  You must have a properly completed
and signed form in your possession.  The original signed form MUST be received
in the Home Office within five (5) working days from the date of the LINK.  The
transaction will take effect based on the time that the LINK is received in the
Home Office.


                             SIGNATURE INSTRUCTIONS

SIGNATURE BY OWNER
All Owners must sign their name as it appears in the policy contract.  If the
Owner's name has changed since the policy was issued, he/she should add his/her
present surname to his/her name as it appears in the policy contract.
SIGNATURE BY ASSIGNEE
If the policy is assigned, the assignee must sign the form.  See rules below if
the assignee is a corporation, partnership, or trust.
SIGNATURE ON BEHALF OF CORPORATION
If the policyowner is a corporation, an officer of the corporation must sign on
behalf of the corporation with his/her title.  The name of the corporation must
appear above the signature.
SIGNATURE ON BEHALF OF PARTNERSHIP
If the policyowner is a partnership, the name of the partnership must appear
above the signature.  A partner other than the Insured must sign.
SIGNATURE ON BEHALF OF TRUST 
If the partnership is a trust, the authorized Trustee must sign his/her name,
followed by the word "Trustee."  The name of the trust must appear above the
signature. 


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