EATON VANCE SPECIAL INVESTMENT TRUST
N-30D, 1999-03-03
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<PAGE>

[LOGO OF EATON VANCE APPEARS HERE]                        [ARTWORK APPEARS HERE]








Annual Report December 31, 1998


[ARTWORK OF NYSE FLAG             EATON VANCE
   APPEARS HERE]                    BALANCED
                                      FUND


                     Global Management-Global Distribution


[ARTWORK OF TRADING FLOOR APPEARS HERE]
<PAGE>
 
Eaton Vance Balanced Fund as of December 31, 1998
- --------------------------------------------------------------------------------
Letter to Shareholders

[PHOTO OF JAMES B. HAWKES APPEARS HERE]

James B. Hawkes
President

Eaton Vance Balanced Fund, Class A shares, had a total return of 13.4% during
the year ended December 31, 1998. That return was the result of a decrease in
net asset value per share (NAV) from $8.70 on December 31, 1997 to $8.14 on
December 31, 1998, and the reinvestment of $0.22 per share in income dividends
and $1.467 per share in capital gains distributions./1/

Class B shares had a total return of 12.6% for the same period, the result of an
unchanged NAV of $13.68, and the reinvestment of $0.215 per share in income
dividends and $1.467 per share in capital gains distributions./1/

Class C shares had a total return of 12.5% for the same period, the result of a
decrease in NAV from $13.24 to $13.17, and the reinvestment of $0.22 per share
in income dividends and $1.467 per share in capital gains distributions./1/

By comparison, average total return performance of funds in the Lipper Balanced
Funds category was 13.5% for the same time period./2/

This year saw extreme gyrations in the stock market. After an impressive rally
in the first half of 1998, the market posted heavy losses from August to early
October, then performed strongly in the fourth quarter. Investor confidence was
bolstered by the Federal Reserve Board's interest rate cuts, modest economic
growth, and low inflation. Stock prices moved upwards, despite the looming
impeachment trial of President Clinton and signs of weakness in corporate
profits. The four-year period ending in 1998 marked the first time in history
that the S&P 500 achieved four consecutive years of annual total returns of at
least 20%.

The bond markets were also quite volatile. With interest rates falling and
inflation nowhere in sight, U.S. Treasury bonds posted strong returns. However,
bonds of lower quality, including corporate bonds and mortgage-backed
securities, dramatically underperformed Treasury issues in 1998.

Looking forward, the factors that precipitated the turbulence in stock and bond
markets in 1998 remain present: Asian economies, while stabilized, are still not
strong; corporate earnings have been lackluster; and ongoing currency crises
worldwide continue to worry the credit markets.

Eaton Vance believes that such market fluctuations underscore the benefits of a
balanced approach to investing. On the following pages, Portfolio Manager Thomas
Faust discusses the past 12 months and offers his outlook for the year ahead.

                                          Sincerely,

                                          /s/ James B. Hawkes

                                          James B. Hawkes
                                          President        
                                          February 1, 1999 
                                          
- --------------------------------------------------------------------------------
Performance/3/                           Class A     Class B     Class C
- --------------------------------------------------------------------------------
Average Annual Total Returns (at net asset value)
- --------------------------------------------------------------------------------
One Year                                  13.4%       12.6%       12.5%
Five Years                                14.8        13.6        12.9
Ten Years                                 13.3         N.A.        N.A.
Life of Fund+                             10.3        13.3        12.7

SEC Average Annual Total Returns (including sales charge or applicable CDSC)
- --------------------------------------------------------------------------------
One Year                                   6.9%        7.6%       11.5%
Five Years                                13.5        13.4        12.9
Ten Years                                 12.7         N.A.        N.A.
Life of Fund+                             10.2        13.1        12.7

+Inception Dates - Class A: 4/01/32; Class B: 11/02/93; Class C: 11/02/93

Ten Largest Equity Holdings/4/
- --------------------------------------------------------------------------------
Sepracor, Inc.                                  2.5%
Unilever ADR                                    2.1
Sofamor Danek Group, Inc.                       2.1
SunAmerica, Inc.                                2.1
Mutual Risk Management Ltd.                     2.1
Warner-Lambert Co.                              1.7
Tyson Foods, Inc.                               1.6
Waste Management, Inc.                          1.6
CVS Corp.                                       1.5
Reynolds & Reynolds, Inc. Class A               1.5
 
/1/ These returns do not include the 5.75% maximum sales charge for the Fund's
Class A shares or the applicable contingent deferred sales charges (CDSC) for
Class B and Class C shares. /2/ It is not possible to invest directly in an
Index or Lipper average. /3/ Returns are historical and are calculated by
determining the percentage change in net asset value with all distributions
reinvested. SEC returns for Class A reflect the maximum 5.75% sales charge. SEC
returns for Class B reflect applicable CDSC based on the following schedule:
5% - 1st and 2nd years; 4% - 3rd year; 3% - 4th year; 2% - 5th year; 1% - 6th
year. SEC 1-Year return for Class C reflects 1% CDSC. /4/ As of 12/31/98. Ten
largest equity holdings accounted for 18.8% of the Portfolio's net assets.
Holdings are subject to change. 

Past performance is no guarantee of future results. Investment return and
principal value will fluctuate so that shares, when redeemed, may be worth more
or less than their original cost.

- --------------------------------------------------------------------------------
Mutual fund shares are not insured by the FDIC and are not deposits or other
obligations of, or guaranteed by, any depository institution. Shares are subject
to investment risks, including possible loss of principal invested.
- --------------------------------------------------------------------------------

                                       2
<PAGE>
 
Eaton Vance Balanced Fund as of December 31, 1998
- --------------------------------------------------------------------------------
Management Discussion


An interview with Thomas E. Faust Jr., Vice President and Portfolio Manager of
the Balanced Portfolio

[PHOTO OF THOMAS E. FAUST JR. APPEARS HERE]

Thomas E. Faust Jr.
Portfolio Manager


Q:   Tom, how would you summarize the performance of the stock market in 1998?

A:   They said it couldn't be done, but this is the fourth year in a row of
     20%-plus returns for the S&P 500 Index, which is unprecedented. This was a
     strange year, though, in a lot of ways. It was very tough to beat the S&P
     500, which was up 28.5% (market cap weighted). More than half of the
     Index's returns came from just 15 stocks - each of which is a
     large-capitalization stock with a market value of more than $60 billion.
     Out of the 500 Index stocks, fewer than 145 stocks did as well as the Index
     itself, and a majority underperformed the Index by more than 20%.

     Market leadership was concentrated in a small number of stocks,
     particularly expensive large cap stocks, with an emphasis on technology. If
     you owned those, it was the best of times. If you owned other things, it
     was much rockier. It was particularly difficult to compete with any sort of
     a value orientation. I can't recall another year when the performance
     disparity among large-cap, mid-cap, and small-cap growth stocks was as
     dramatic as it was in 1998.

Q:   Was there a similar split performance in the other major asset class of
     this Portfolio, bonds?

A:   Overall, it was a decent year for bonds. The total return performance of
     the Lehman Brothers Government/Corporate Index was about 9.5%, consisting
     of interest income plus some price appreciation. But again, it was a tale
     of two markets on the bond side. The Treasury market did quite well, but
     the corporate bond market did rather poorly. Investors became more
     risk-averse due to the financial collapse in Russia, concerns about Brazil,
     major problems in Southeast Asia, and the corporate sector's exposure to
     these hotspots. So, it was an uneven year in the bond market as well.

Q:   How does the Balanced Portfolio weather this kind of volatility in both the
     stock and bond markets?

A:   The Balanced Portfolio is a fairly conservative core Portfolio that
     combines investments in stocks and bonds. Investing in both stocks and
     bonds can minimize volatility, as compared to investing strictly in stocks.
     Our performance over time has tended to be intermediate between the returns
     of the stock market and bond market returns, and that's where we were in
     1998.


Portfolio Allocation+
- --------------------------------------------------------------------------------
As a percentage of total net assets

[PIE CHART APPEARS HERE]

Common Stocks     62.5%
Corp. Bonds       22.4%
U.S. Treasuries   12.8%
Other              2.3%

+ Portfolio allocation subject to change due to active management.



                                       3
<PAGE>
 
Eaton Vance Balanced Fund as of December 31, 1998
- --------------------------------------------------------------------------------
Management Discussion



Q:   Did you maintain large weightings in the finance and healthcare sectors
     this year?

A:   Yes, we did. We ended the year with approximately 13% of the equity portion
     of the Portfolio invested in financial stocks, mostly in insurance but with
     exposure to banks and various financial companies. It's a sector that
     generally has performed well and provided the Fund with good returns.
     However, financials did have some problems during the course of the year,
     and exposure to credit concerns in various places did hurt the financial
     companies. Nonetheless, financial stocks came back in the fourth quarter
     from losses in the third quarter. So, it was a bit of a volatile year.

     Healthcare stocks, at about 16% of the equity portion of the Portfolio,
     also generally performed well, and certainly a number of our stand-out
     performers in the Fund came from the healthcare sector. Sepracor, our
     largest holding, was a significant contributor to performance at the end of
     the year. Another successful holding was Sofamor-Danek, the subject of a
     takeover that was completed in early 1999. Through our research and
     analysis, we had identified both companies as highly promising, and each
     produced very strong returns for the Portfolio in 1998. 

Q:   What more can you tell us about the Portfolio's largest holding, Sepracor?

A:   Sepracor is a drug development company with a twist: they develop improved
     versions of existing drugs. Many major drugs on the market today are
     "racemic mixtures," which means there are two parts: one therapeutic, and
     the other often producing certain undesirable side effects. Sepracor
     employs a drug development and production technology that could separate
     these two parts. They are in the early stages of rolling out these
     potentially blockbuster drugs that are follow-on products to some of
     today's largest selling drugs.

     Typically, Sepracor enters into royalty and profit-sharing arrangements
     with the developer and marketer of the original compound. One of the
     compounds they have in development is a successor to Claritin, the major
     antihistamine from Schering-Plough; the arrangement was announced toward
     the beginning of the year. Then, near the end of the year, another
     arrangement was announced with Eli Lilly for a successor product to Prozac.
     Those are two blockbuster products, so this company could be very
     profitable in 3 or 4 years' time. It's a great recipe for success in the
     drug business. 

Q:   You mentioned another large holding, Sofamor-Danek. Why is this stock a
     strong performer in the Portfolio?

A:   Sofamor-Danek has been one of our largest holdings over the last several
     years. In 1998, the company entered into a merger agreement with Medtronic,
     which is the largest cardio-vascular device company in the U.S.
     Sofamor-Danek will become their orthopedic/neurological arm. The stock has
     been a great winner for us. Four or five years ago, it was widely viewed as
     a company in trouble due to regulatory and legal problems. Today, the
     company has come back to the point that it has been acquired by an industry
     leader, and everything looks pretty good for the company.

Q:   What concerns do you have for the stock market in 1999?

A:   Certainly, stock valuations are my biggest concern. Simply put, stocks are
     expensive. Not all stocks, but there's a tier, particularly of internet
     stocks and technology stocks, where the valuation begs the question, Does
     this make sense? The answer is often no, but in many cases these are stocks
     that were big leaders last year, so momentum is in their favor. I do worry
     that a return to more rational valuation levels for some of these
     market-leading companies could potentially put the market at some risk. I
     don't think it's a huge risk - there are still positive things in this
     market, the biggest one probably being low interest rates. The fact is that
     stocks still look like a relatively good place to put your money. But
     overall, I would say that I'm somewhat cautious of the equity market.

                                       4
<PAGE>
 
Eaton Vance Balanced Fund as of December 31, 1998
- --------------------------------------------------------------------------------
Management Discussion


Q:   What is your outlook for the bond market in 1999?

A:   There is a particular area I'll be keeping my eye on. It's pretty clear
     that there's been a major push around the world among policy makers and
     central banks to try and stimulate various economies. So, there's been an
     enormous growth in money supply around the world. I think there's some
     potential that we will see increasing concerns about inflation as the year
     goes on, and that's going to worry bond investors. Therefore, I'm a little
     cautious on both sides: there's a lot of risk related to valuations on the
     stock side, and there's risk on the bond side related to money supply
     growth and aggressive efforts to fight deflation in the U.S., Europe,
     Japan, and Southeast Asia. I should emphasize that I'm not bearish, just
     cautious near-term. Our focus remains long-term; ours is a measured
     approach and we try not to take big risks.


Eaton Vance Balanced Fund, Class A vs.
Standard & Poor's 500

             Date            Fund/NAV         Fund/MOP           S&P
             ----            --------         --------           ---
         12/31/88             $10,000           $9,422       $10,000
          1/31/89             $10,456           $9,852       $10,711
          2/28/89             $10,298           $9,703       $10,401
          3/31/89             $10,413           $9,812       $10,708
          4/30/89             $10,790          $10,166       $11,244
          5/31/89             $11,002          $10,366       $11,639
          6/30/89             $11,078          $10,437       $11,651
          7/31/89             $11,635          $10,963       $12,680
          8/31/89             $11,727          $11,049       $12,877
          9/30/89             $11,757          $11,078       $12,896
         10/31/89             $11,681          $11,006       $12,572
         11/30/89             $11,835          $11,151       $12,780
         12/31/89             $12,076          $11,378       $13,159
          1/31/90             $11,530          $10,864       $12,253
          2/28/90             $11,709          $11,032       $12,358
          3/31/90             $11,758          $11,079       $12,761
          4/30/90             $11,514          $10,848       $12,418
          5/31/90             $12,209          $11,504       $13,560
          6/30/90             $12,226          $11,520       $13,560
          7/31/90             $12,430          $11,712       $13,489
          8/31/90             $11,740          $11,062       $12,217
          9/30/90             $11,550          $10,883       $11,705
         10/31/90             $11,481          $10,818       $11,627
         11/30/90             $11,935          $11,246       $12,324
         12/31/90             $12,199          $11,494       $12,749
          1/31/91             $12,428          $11,709       $13,278
          2/28/91             $12,802          $12,062       $14,172
          3/31/91             $12,944          $12,196       $14,594
          4/30/91             $12,998          $12,246       $14,599
          5/31/91             $13,233          $12,469       $15,162
          6/30/91             $12,959          $12,210       $14,562
          7/31/91             $13,398          $12,624       $15,216
          8/31/91             $13,695          $12,903       $15,515
          9/30/91             $13,824          $13,025       $15,340
         10/31/91             $14,083          $13,269       $15,522
         11/30/91             $13,896          $13,093       $14,840
         12/31/91             $14,795          $13,940       $16,617
          1/31/92             $14,448          $13,613       $16,286
          2/28/92             $14,546          $13,705       $16,442
          3/31/92             $14,331          $13,503       $16,199
          4/30/92             $14,487          $13,650       $16,651
          5/31/92             $14,751          $13,898       $16,667
          6/30/92             $14,872          $14,012       $16,507
          7/31/92             $15,255          $14,374       $17,157
          8/31/92             $15,316          $14,430       $16,745
          9/30/92             $15,397          $14,507       $17,027
         10/31/92             $15,234          $14,353       $17,063
         11/30/92             $15,482          $14,587       $17,580
         12/31/92             $15,749          $14,839       $17,881
          1/31/92             $15,792          $14,879       $18,007
          2/28/93             $16,094          $15,164       $18,196
          3/31/93             $16,288          $15,347       $18,659
          4/30/93             $16,180          $15,245       $18,185
          5/31/93             $16,234          $15,296       $18,598
          6/30/93             $16,502          $15,549       $18,748
          7/31/93             $16,592          $15,633       $18,648
          8/31/93             $17,266          $16,268       $19,290
          9/30/93             $17,470          $16,460       $19,230
         10/31/93             $17,560          $16,545       $19,603
         11/30/93             $17,115          $16,126       $19,350
         12/31/93             $17,511          $16,499       $19,675
          1/31/94             $18,181          $17,130       $20,314
          2/28/94             $17,723          $16,699       $19,704
          3/31/94             $17,023          $16,039       $18,935
          4/30/94             $17,119          $16,130       $19,153
          5/31/94             $17,156          $16,165       $19,391
          6/30/94             $16,783          $15,813       $19,016
          7/31/94             $17,331          $16,329       $19,615
          8/31/94             $17,658          $16,638       $20,353
          9/30/94             $17,256          $16,259       $19,946
         10/31/94             $17,407          $16,401       $20,362
         11/30/94             $17,041          $16,056       $19,558
         12/31/94             $17,193          $16,200       $19,942
          1/31/95             $17,371          $16,367       $20,426
          2/28/95             $18,046          $17,003       $21,163
          3/31/95             $18,481          $17,413       $21,878
          4/30/95             $18,917          $17,824       $22,490
          5/31/95             $19,662          $18,526       $23,306
          6/30/95             $19,973          $18,819       $23,959
          7/31/95             $20,413          $19,233       $24,721
          8/31/95             $20,779          $19,578       $24,713
          9/30/95             $21,066          $19,848       $25,858
         10/31/95             $21,092          $19,873       $25,729
         11/30/95             $21,668          $20,416       $26,785
         12/31/95             $22,297          $21,009       $27,409
          1/31/96             $22,653          $21,344       $28,303
          2/28/96             $22,732          $21,418       $28,500
          3/31/96             $22,898          $21,574       $28,879
          4/30/96             $23,063          $21,730       $29,267
          5/31/96             $23,324          $21,976       $29,936
          6/30/96             $23,519          $22,160       $30,172
          7/31/96             $22,739          $21,424       $28,791
          8/31/96             $23,225          $21,883       $29,333
          9/30/96             $23,957          $22,572       $31,097
         10/31/96             $24,435          $23,022       $31,910
         11/30/96             $25,548          $24,071       $34,251
         12/31/96             $25,333          $23,869       $33,686
          1/31/97             $26,397          $24,872       $35,752
          2/28/97             $26,457          $24,928       $35,964
          3/31/97             $25,670          $24,186       $34,595
          4/30/97             $26,552          $25,017       $36,616
          5/31/97             $27,716          $26,114       $38,761
          6/30/97             $28,555          $26,904       $40,622
          7/31/97             $30,361          $28,607       $43,795
          8/31/97             $29,101          $27,419       $41,279
          9/30/97             $30,269          $28,520       $43,660
         10/31/97             $30,010          $28,275       $42,154
         11/30/97             $30,465          $28,705       $44,034
         12/31/97             $30,806          $29,025       $44,909
          1/31/98             $31,160          $29,359       $45,365
          2/28/98             $32,766          $30,873       $48,560
          3/31/98             $33,942          $31,980       $51,160
          4/30/98             $34,405          $32,416       $51,624
          5/31/98             $33,691          $31,743       $50,652
          6/30/98             $34,049          $32,081       $52,844
          7/31/98             $33,655          $31,710       $52,230
          8/31/98             $30,686          $28,912       $44,615
          9/30/98             $32,271          $30,406       $47,598
         10/31/98             $33,243          $31,322       $51,419
         11/30/98             $34,201          $32,224       $54,460
         12/31/98             $34,942          $32,922       $57,717


Performance**                            Class A     Class B     Class C
- --------------------------------------------------------------------------------
Average Annual Total Returns (at net asset value)
- --------------------------------------------------------------------------------
One Year                                  13.4%       12.6%       12.5%
Five Years                                14.8        13.6        12.9
Ten Years                                 13.3         N.A.        N.A.
Life of Fund+                             10.3        13.3        12.7

SEC Average Annual Total Returns (including sales charge or applicable CDSC)
- --------------------------------------------------------------------------------
One Year                                   6.9%        7.6%       11.5%
Five Years                                13.5        13.4        12.9
Ten Years                                 12.7         N.A.        N.A.
Life of Fund+                             10.2        13.1        12.7

+Inception Dates - Class A: 4/01/32; Class B: 11/02/93; Class C: 11/02/93

*    Source: Towers Data Systems, Bethesda, MD. Investment operations commenced
     4/01/32. Index information is available only at month-end; therefore, the
     line comparison begins at the next month-end following the commencement of
     the Fund's investment operations.
     The chart compares the Fund's total return with those of the S&P 500 Index
     and the Lehman Brothers Government/Corporate Bond Index. The S&P 500 is an
     unmanaged index of 500 common stocks commonly used as a measure of U.S.
     stock performance. The Lehman Brothers Corporate/Government Index is a
     diversified, unmanaged index of corporate and U.S. government bonds.
     Returns are calculated by determining the percentage change in net asset
     value with all distributions reinvested. The lines on the chart represent
     the total returns of $10,000 hypothetical investments in the Fund, the S&P
     500 Index and the Lehman Brothers Corporate/Government Bond Index. An
     investment in the Fund's Class B and Class C shares on 11/30/93 at net
     asset value would have grown to $19,274 and $18,624 on December 31, 1998,
     respectively. The Indices' total returns do not reflect any commissions or
     expenses that would have been incurred if an investor individually
     purchased or sold the securities represented in them. It is not possible to
     invest directly in an Index.
**   Returns are historical and are calculated by determining the percentage
     change in net asset value with all distributions reinvested. SEC returns
     for Class A reflect the maximum 5.75% sales charge. SEC returns for Class B
     reflect applicable CDSC based on the following schedule: 5% - 1st and 2nd
     years; 4% - 3rd year; 3% - 4th year; 2% - 5th year; 1% - 6th year. SEC
     1-Year return for Class C reflects 1% CDSC.

     Past performance is no guarantee of future results. Investment return and
     principal value will fluctuate so that shares, when redeemed, may be worth
     more or less than their original cost.


                                       5
<PAGE>
Eaton Vance Balanced Fund as of December 31, 1998

FINANCIAL STATEMENTS

Statement of Assets and Liabilities                                           

As of December 31, 1998                                                  
Assets                                                                   
- --------------------------------------------------------------------------------
Investment in Balanced Portfolio, at value
    (identified cost, $282,393,927)                         $355,353,036 
Receivable for Fund shares sold                                  207,543 
Deferred organization expenses                                       180 
- --------------------------------------------------------------------------------
Total assets                                                $355,560,759 
- --------------------------------------------------------------------------------


Liabilities                                                              
- --------------------------------------------------------------------------------
Dividends payable                                           $     11,435 
Payable for Fund shares redeemed                               1,454,891 
Payable to affiliate for Trustees' fees                              983 
Other accrued expenses                                           238,851 
- --------------------------------------------------------------------------------
Total liabilities                                           $  1,706,160 
- --------------------------------------------------------------------------------
Net Assets                                                  $353,854,599 
- --------------------------------------------------------------------------------


Sources of Net Assets                                                    
- --------------------------------------------------------------------------------
Paid-in capital                                             $275,372,390 
Accumulated undistributed net realized gain from
    Portfolio (computed on the basis of identified cost)       5,182,260 
Accumulated undistributed net investment income                  340,840 
Net unrealized appreciation from Portfolio (computed
    on the basis of identified cost)                          72,959,109 
- --------------------------------------------------------------------------------
Total                                                       $353,854,599 
- --------------------------------------------------------------------------------


Class A Shares                                                           
- --------------------------------------------------------------------------------
Net Assets                                                  $270,276,766 
Shares Outstanding                                            33,199,411 
Net Asset Value and Redemption Price Per Share                           
    (net assets / shares of beneficial interest             $       8.14 
    outstanding)
Maximum Offering Price Per Share                                         
    (100 / 94.25 of $8.14)                                  $       8.64 
- --------------------------------------------------------------------------------


Class B Shares                                                           
- --------------------------------------------------------------------------------
Net Assets                                                  $ 72,835,536 
Shares Outstanding                                             5,323,658 
Net Asset Value, Offering Price and Redemption Price                     
    Per Share 
    (net assets / shares of beneficial interest             
    outstanding)                                            $      13.68 
- --------------------------------------------------------------------------------


Class C Shares                                                           
- --------------------------------------------------------------------------------
Net Assets                                                  $ 10,742,297 
Shares Outstanding                                               815,945 
Net Asset Value, Offering Price and Redemption Price                     
    Per Share
    (net assets / shares of beneficial interest             $      13.17 
    outstanding)
- --------------------------------------------------------------------------------
On  sales of $50,000 or more, the offering price of Class A shares is reduced.

Statement of Operations

For the Year Ended
December 31, 1998                                                        
Investment Income                                                        
- --------------------------------------------------------------------------------
Dividends allocated from Portfolio (net of
    foreign taxes, $48,178)                                 $  4,082,039 
Interest allocated from Portfolio                              7,922,884 
Expenses allocated from Portfolio                             (2,359,218)
- --------------------------------------------------------------------------------
Net investment income from Portfolio                        $  9,645,705 
- --------------------------------------------------------------------------------


Expenses                                                               
- --------------------------------------------------------------------------------
Trustees fees and expenses                                  $      3,351 
Distribution and service fees                                            
        Class A                                                  348,565 
        Class B                                                  643,803 
        Class C                                                   85,805 
Transfer and dividend disbursing agent fees                      451,426 
Printing and postage                                              44,275 
Registration fees                                                 34,378 
Custodian fee                                                     33,122 
Legal and accounting services                                     20,977 
Amortization of organization expenses                             16,060 
Miscellaneous                                                     26,399 
- --------------------------------------------------------------------------------
Total expenses                                              $  1,708,161 
- --------------------------------------------------------------------------------

Net investment income                                       $  7,937,544 
- --------------------------------------------------------------------------------


Realized and Unrealized
Gain (Loss) from Portfolio                                               
- --------------------------------------------------------------------------------
Net realized gain (loss) --                                               
    Investment transactions (identified cost basis)         $ 56,088,133 
- --------------------------------------------------------------------------------
Net realized gain                                           $ 56,088,133 
- --------------------------------------------------------------------------------
Change in unrealized appreciation (depreciation) --                       
    Investments                                             $(20,974,299)
- --------------------------------------------------------------------------------
Net change in unrealized appreciation (depreciation)        $(20,974,299)
- --------------------------------------------------------------------------------

Net realized and unrealized gain                            $ 35,113,834 
- --------------------------------------------------------------------------------

Net increase in net assets from operations                  $ 43,051,378 
- --------------------------------------------------------------------------------



                       See note to financial statements

                                       6


<PAGE>
Eaton Vance Balanced Fund as of December 31, 1998 

FINANCIAL STATEMENTS CONT'D

Statements of Changes in Net Assets


Increase (Decrease)              Year Ended             Year Ended              
in Net Assets                    December 31, 1998      December 31, 1997     
- --------------------------------------------------------------------------------
From operations --                                                        
    Net investment income             $  7,937,544          $   6,043,945 
    Net realized gain                   56,088,133             20,676,352 
    Net change in unrealized
        appreciation (depreciation)    (20,974,299)            23,123,556 
- --------------------------------------------------------------------------------
Net increase in net assets
    from operations                   $ 43,051,378          $  49,843,853 
- --------------------------------------------------------------------------------
Distributions to shareholders --                                          
    From net investment income                                            
        Class A                       $ (6,508,416)         $  (5,802,058)
        Class B                           (993,141)                    --  
        Class C                           (137,056)                    --  
    From net realized gain                                                
        Class A                        (42,983,323)           (25,427,692)
        Class B                         (7,093,638)                    --  
        Class C                         (1,058,761)                    --  
- --------------------------------------------------------------------------------
Total distributions to shareholders   $(58,774,335)         $ (31,229,750)
- --------------------------------------------------------------------------------
Transactions in shares of                                                
    beneficial interest --
    Proceeds from sale of shares
        Class A                       $ 12,361,950          $   8,832,967 
        Class B                         18,222,027                     --  
        Class C                          5,551,967                     --  
    Issued in reorganization of
        EV Marathon and 
        Classic Investors Funds
        Class B                         59,501,704                     --  
        Class C                          7,307,794                     --  
    Net asset value of shares
        issued to shareholders
        in payment of                                                     
        distributions declared
        Class A                         36,065,386             22,842,764 
        Class B                          7,242,661                     --  
        Class C                          1,135,545                     --  
    Cost of shares redeemed                                               
        Class A                        (26,590,459)           (26,777,414)
        Class B                        (11,838,168)                    --  
        Class C                         (3,112,669)                    --  
- --------------------------------------------------------------------------------
Net increase in net assets from
    Fund share transactions           $105,847,738          $   4,898,317 
- --------------------------------------------------------------------------------

Net increase in net assets            $ 90,124,781          $  23,512,420 
- --------------------------------------------------------------------------------


                                 Year Ended             Year Ended       
Net Assets                       December 31, 1998      December 31, 1997
- --------------------------------------------------------------------------------
At beginning of year                  $263,729,818          $ 240,217,398 
- --------------------------------------------------------------------------------
At end of year                        $353,854,599          $ 263,729,818 
- --------------------------------------------------------------------------------


Accumulated 
undistributed net
investment income 
included in net assets
- --------------------------------------------------------------------------------
At end of year                        $    340,840          $     205,985 
- --------------------------------------------------------------------------------




                       See notes to financial statements

                                       7


<PAGE>
Eaton Vance Balanced Fund as of December 31, 1998 

FINANCIAL STATEMENTS CONT'D

Financial Highlights
<TABLE> 
<CAPTION> 
                                             Year Ended December 31,             Year Ended December 31,      Year Ended January 31,
                                                       1998                   1997        1996      1995(1)      1995        1994
                                          Class A     Class B    Class C     Class A     Class A    Class A     Class A     Class A
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                       <C>        <C>        <C>         <C>         <C>         <C>         <C>         <C>  
Net asset value -- Beginning of year      $ 8.700    $ 13.680   $ 13.240    $  8.090    $  8.150    $ 6.840     $ 7.600     $ 7.390 
- ------------------------------------------------------------------------------------------------------------------------------------


Income (loss) from operations                                                                                                       
- ------------------------------------------------------------------------------------------------------------------------------------
Net investment income                     $ 0.226    $ 0.231    $ 0.216     $  0.208    $  0.254    $ 0.254     $ 0.283     $ 0.217 
Net realized and unrealized gain (loss)     0.901      1.451      1.401        1.492       0.821      1.641      (0.623)      0.833 
- ------------------------------------------------------------------------------------------------------------------------------------
Total income (loss) from operations       $ 1.127    $ 1.682    $ 1.617     $  1.700    $  1.075    $ 1.895     $(0.340)    $ 1.050 
- ------------------------------------------------------------------------------------------------------------------------------------


Less distributions                                                                                                                  
- ------------------------------------------------------------------------------------------------------------------------------------
From net investment income                $(0.220)   $(0.215)   $(0.220)    $ (0.200)   $ (0.254)   $(0.248)    $(0.275)    $(0.307)
In excess of net investment income             --         --         --           --      (0.001)        --          --      (0.008)
From net realized gain                     (1.467)    (1.467)    (1.467)      (0.890)     (0.880)    (0.337)     (0.145)     (0.525)
- ------------------------------------------------------------------------------------------------------------------------------------
Total distributions                       $(1.687)   $(1.682)   $(1.687)    $ (1.090)   $ (1.135)   $(0.585)    $(0.420)    $(0.840)
- ------------------------------------------------------------------------------------------------------------------------------------

Net asset value -- End of year            $ 8.140    $ 13.680   $ 13.170    $  8.700    $  8.090    $ 8.150     $ 6.840     $ 7.600 
- ------------------------------------------------------------------------------------------------------------------------------------

Total Return (2)                            13.43%     12.59%     12.51%       21.60%      13.61%     28.36%      (4.45)%     15.13%
- ------------------------------------------------------------------------------------------------------------------------------------


Ratios/Supplemental Data                                                                                                            
- ------------------------------------------------------------------------------------------------------------------------------------
Net assets, end of year (000's omitted)   $270,277   $ 72,836   $ 10,742    $263,730    $240,217    $236,870    $200,419   $227,402
Ratios (As a percentage of average daily
    net assets):                             0.98%      1.81%      1.85%        0.97%       0.93%      0.95%(4)    0.91%       0.90%
    Expenses (3)
    Net investment income                    2.45%      1.62%      1.58%        2.35%       3.03%      3.60%(4)    4.05%       4.07%
Portfolio turnover (5)                         --         --         --           --          --         --          --          44%
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE> 
(1)  For the eleven-month period ended December 31, 1995.
(2)  Total return is calculated assuming a purchase at the net asset value on
     the first day and a sale at the net asset value on the last day of each
     period reported. Dividends and distributions, if any, are assumed
     reinvested at the net asset value on the reinvestment date. Total return is
     not computed on an annualized basis.
(3)  Includes the Fund's share of the Portfolio's allocated expenses for the
     period the Fund was investing in the Portfolio.
(4)  Annualized.
(5)  Portfolio Turnover represents the rate of portfolio activity for the period
     while the Fund was making investments directly in securities. The portfolio
     turnover rate for the period since the Fund transferred all of its
     investable assets to the Portfolio is shown in the Portfolio's financial
     statements which are included elsewhere in this report.



                       See notes to financial statements

                                       8




<PAGE>
 
Eaton Vance Balanced Fund as of December 31, 1998 

NOTES TO FINANCIAL STATEMENTS 


  1 Significant Accounting Policies
   -----------------------------------------------------------------------------
    Eaton Vance Balanced Fund (the Fund) (formerly the Eaton Vance Investors
    Fund) is a diversified series of Eaton Vance Special Investment Trust (the
    Trust). The Trust is an entity of the type commonly known as a Massachusetts
    business trust and is registered under the Investment Company Act of 1940,
    as amended, as an open-end management investment company. The Fund offers
    three classes of shares. Class A shares are sold subject to a sales charge
    imposed at the time of purchase. Class B and Class C shares are sold at net
    asset value and are subject to a contingent deferred sales charge (see Note
    6). All classes of shares have equal rights to assets and voting privileges.
    Realized and unrealized gains and losses and net investment income, other
    than class specific expenses, are allocated daily to each class of shares
    based on the relative net assets of each class to the total net assets of
    the Fund. Each class of shares differs in its distribution plan and certain
    other class specific expenses. The Fund invests all of its investable assets
    in interests in the Balanced Portfolio (the Portfolio), a New York Trust,
    having the same investment objective as the Fund. The value of the Fund's
    investment in the Portfolio reflects the Fund's proportionate interest in
    the net assets of the Portfolio (100% at December 31, 1998). The performance
    of the Fund is directly affected by the performance of the Portfolio. The
    financial statements of the Portfolio, including the portfolio of
    investments, are included elsewhere in this report and should be read in
    conjunction with the Fund's financial statements.

    The following is a summary of significant accounting policies consistently
    followed by the Fund in the preparation of its financial statements. The
    policies are in conformity with generally accepted accounting principles.

    A Investment Valuations -- Valuations of securities by the Portfolio are
    discussed in Note 1A of the Portfolio's Notes to Financial Statements which
    are included elsewhere in this report.

    B Income -- The Fund's net investment income consists of the Fund's pro rata
    share of the net investment income of the Portfolio, less all actual and
    accrued expenses of the Fund determined in accordance with generally
    accepted accounting principles. Prior to the Fund's investment in the
    Portfolio, the Fund held its investments directly.


    C Federal Taxes -- The Fund's policy is to comply with the provisions of the
    Internal Revenue Code applicable to regulated investment companies and to
    distribute to shareholders each year all of its taxable income, including
    any net realized gain on investments. Accordingly, no provision for federal
    income or excise tax is necessary. Pursuant to Section 852 of the Internal
    Revenue Code, the Fund designates $51,135,722 as a long-term capital gain
    distribution for its taxable year ended December 31, 1998.

    D Deferred Organization Expenses -- Costs incurred by the Fund in connection
    with its organization, including registration costs, are being amortized on
    a straight-line basis over five years.

    E Other -- Investment transactions are accounted for on a trade-date basis.

    F Use of Estimates -- 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 at the date of the financial statements and the reported
    amounts of revenue and expense during the reporting period. Actual results
    could differ from those estimates.

  2 Distributions to Shareholders
   -----------------------------------------------------------------------------
    The Fund's present policy is to pay quarterly dividends from net investment
    income allocated to the Fund by the Portfolio (less the Fund's direct
    expenses) and to distribute at least annually all or substantially all of
    the net realized capital gains (reduced by any available capital loss
    carryforwards from prior years) so allocated. Shareholders may reinvest all
    distributions in shares of the Fund at the per share net asset value as of
    the close of business on the ex-dividend date. The Fund distinguishes
    between distributions on a tax basis and a financial reporting basis.
    Generally accepted accounting principles require that only distributions in
    excess of tax basis earnings and profits be reported in the financial
    statements as a return of capital. Differences in the recognition or
    classification of income between the financial statements and tax earnings
    and profits which result in temporary over-distributions for financial
    statement purposes are classified as distributions in excess of net
    investment income or accumulated net realized gains. Permanent differences
    between book and tax accounting relating to distributions are reclassified
    to paid-in-capital.

                                       9
<PAGE>
 
Eaton Vance Balanced Fund as of December 31, 1998 

NOTES TO FINANCIAL STATEMENTS CONT'D


  3 Shares of Beneficial Interest
   -----------------------------------------------------------------------------
    The Fund's Declaration of Trust permits the Trustees to issue an unlimited
    number of full and fractional shares of beneficial interest (without par
    value). Transactions in Fund shares were as follows:


                                              Year Ended December 31,
                                         ---------------------------------
 
   Class A                                  1998                    1997
   -----------------------------------------------------------------------------
   Sales                                 1,343,770               1,006,180

   Issued to shareholders
     electing to receive
     payments of                         4,456,369               2,664,443
     distributions in Fund
     shares

   Redemptions                          (2,907,747)             (3,051,117)
   -----------------------------------------------------------------------------

   Net increase                          2,892,392                 619,506
   -----------------------------------------------------------------------------



                                                         Year Ended
   Class B                                               December 31, 1998
   -----------------------------------------------------------------------------
   Sales                                                         1,253,930
   
   Issued to shareholders electing to receive
     payment of distributions in Fund shares                       535,537

   Redemptions                                                    (815,682)

   Issued to EV Marathon Investors Fund shareholders             4,349,873
   -----------------------------------------------------------------------------

   Net increase                                                  5,323,658
   -----------------------------------------------------------------------------



                                                         Year Ended
   Class C                                               December 31, 1998
   -----------------------------------------------------------------------------
   Sales                                                           399,045
   
   Issued to shareholders electing to receive
     payment of distributions in Fund shares                        87,300
   
   Redemptions                                                    (222,406)
    
   Issued to EV Classic Investors Fund shareholders                552,006
   -----------------------------------------------------------------------------

   Net increase                                                    815,945
   -----------------------------------------------------------------------------

  4 Transactions with Affiliates
   -----------------------------------------------------------------------------
    Eaton Vance Management (EVM) serves as the administrator of the Fund, but
    receives no compensation. The Portfolio has engaged Boston Management and
    Research (BMR), a subsidiary of EVM, to render investment advisory services.
    See Note 2 of the Portfolio's Notes to Financial Statements which are
    included elsewhere in this report. Except as to Trustees of the Fund and the
    Portfolio who are not members of EVM's or BMR's organizations, officers and
    Trustees receive remuneration for their services to the Fund out of such
    investment adviser fee. Eaton Vance Distributors, Inc. (EVD), a subsidiary
    of EVM and the Fund's principal underwriter, received $25,178 from the Fund
    as its portion of the sales charge on sales of Class A shares for the year
    ended December 31, 1998.

    Certain of the officers and Trustees of the Fund and Portfolio are officers
    and directors/trustees of the above organizations.

  5 Distribution and Service Plans
   -----------------------------------------------------------------------------
    The Fund has adopted distribution plans (Class B Plan and Class C Plan)
    pursuant to Rule 12b-1 under the Investment Company Act of 1940 and a
    service plan (Class A Plan) (collectively, the Plans). The Plans require the
    Fund to pay the principal underwriter, EVD amounts equal to 1/365 of 0.75%
    of the Fund's daily net assets attributable to Class B and Class C shares
    for providing ongoing distribution services and facilities to the Fund. The
    Fund will automatically discontinue payments to EVD during any period in
    which there are no outstanding Uncovered Distribution Charges, which are
    equivalent to the sum of (i) 5% and 6.25% of the aggregate amount received
    by the Fund for the Class B and Class C shares sold, respectively plus, (ii)
    interest calculated by applying the rate of 1% over the prevailing prime
    rate to the outstanding balance of Uncovered Distribution Charges of EVD of
    each respective class, reduced by the aggregate amount of contingent
    deferred sales charges (see Note 6) and amounts theretofore paid to or
    payable to EVD. The amount payable to EVD with respect to each day is
    accrued on such day as a liability of the Fund and, accordingly, reduces the
    Fund's net assets attributable to Class B and Class C shares, respectively.
    The Fund paid or accrued $503,630 and $64,354 for Class B and Class C
    shares, respectively, to EVD for the year ended December 31, 1998,
    representing


                                      10
<PAGE>
 
Eaton Vance Balanced Fund as of December 31, 1998

NOTES TO FINANCIAL STATEMENTS CONT'D


    0.75% of the average daily net assets for Class B and Class C shares. At
    December 31, 1998, the amount of Uncovered Distribution Charges EVD
    calculated under the Plan was approximately $1,718,000 and $1,271,000 for
    Class B and Class C shares, respectively.

    In addition, the Plans also authorize each class to make payments of service
    fees to EVD, Authorized Firms and other persons in amounts not exceeding
    0.25% of the Fund's average daily net assets attributable to Class A, Class
    B and Class C shares for each fiscal year. The Trustees have initially
    implemented the Plans by authorizing each class to make quarterly payments
    of service fees to EVD and Authorized Firms in amounts not expected to
    exceed 0.25% per annum of the Fund's average daily net assets attributable
    to Class A and Class B shares based on the value of Fund shares sold by such
    persons and remaining outstanding for at least one year. The Class C plan
    requires the Fund to make monthly payments of service fees in amounts not
    expected to exceed 0.25% of the Fund's average daily net assets attributable
    to Class C shares for any fiscal year. Service fee payments will be made for
    personal services and/or the maintenance of shareholder accounts. Service
    fees are separate and distinct from the sales commissions and distribution
    fees payable by the Fund to EVD, and, as such are not subject to automatic
    discontinuance when there are no outstanding Uncovered Distribution Charges
    of EVD. Service fee payments for the year ended December 31, 1998 amounted
    to $348,565, $140,173, and $21,451 for Class A, Class B, and Class C shares,
    respectively.

    Certain officers and Trustees of the Fund are officers or directors of EVD.

  6 Contingent Deferred Sales Charge
   -----------------------------------------------------------------------------
    A contingent deferred sales charge (CDSC) is imposed on any redemption of
    Class B shares made within six years of purchase. A CDSC of 1% is imposed
    on any redemption of Class C shares made within one year of purchase. A
    CDSC of 1% is imposed on any redemption of Class A shares made within 12
    months of purchase that were acquired at net asset value if the purchase
    amount was $1 million or more. Generally, the CDSC is based upon the lower
    of the net asset value at date of redemption or date of purchase. No charge
    is levied on shares acquired by reinvestment of dividends or capital gains
    distributions. Class B CDSC is imposed at declining rates that begin at 5%
    in the case of redemptions in the first and second year after purchase,
    declining one percentage point each subsequent year. No CDSC is levied on
    shares which have been sold to EVM or its affiliates or to their respective
    employees or clients. CDSC charges are paid to EVD to reduce the amount of
    Uncovered Distribution Charges calculated under each Fund's Distribution
    Plan (see Note 5). CDSC charges received when no Uncovered Distribution
    Charges exist will be retained by the Fund. EVD received approximately
    $106,000 and $3,000 of CDSC paid by shareholders for Class B and Class C
    shares, respectively, for the year ended December 31, 1998.

  7 Investment Transactions
   -----------------------------------------------------------------------------
    Increases and decreases in the Fund's investment in the Portfolio for the
    year ended December 31, 1998, aggregated $38,451,067 and $57,564,792,
    respectively.

  8 Transfer of Net Assets
   -----------------------------------------------------------------------------
    On January 1, 1998, EV Traditional Investors Fund received the net assets of
    the EV Marathon Investors Fund and EV Classic Investors Fund pursuant to an
    Agreement and Plan of Reorganization dated June 23, 1997. In accordance with
    the agreement, EV Traditional Investors Fund, at the closing, issued
    4,349,873 Class B shares and 552,006 Class C shares of the Fund having an
    aggregate value of $59,501,704 and $7,307,794, respectively. As a result the
    Fund issued one Class B share and one Class C share for each share of EV
    Marathon Investors Fund and EV Classic Investors Fund, respectively. The
    transaction was structured for tax purposes to qualify as a tax free
    reorganization under the Internal Revenue Code. The EV Marathon Investors
    Fund's and EV Classic Investors Fund's net assets at the date of the
    transaction were $59,501,704 and $7,307,794, respectively, including
    $11,654,296 and $1,851,259 of unrealized appreciation. Directly after the
    merger, the combined net assets of the Eaton Vance Investors Fund (formerly
    "EV Traditional Investors Fund") were $330,539,316 with a net asset value of
    $8.70, $13.68 and $13.24 for Class A, Class B and Class C, respectively.

  9 Name Change
   -----------------------------------------------------------------------------
    Effective January 1, 1998, EV Traditional Investors Fund changed its name to
    Eaton Vance Investors Fund. Effective May 1, 1998, Eaton Vance Investors
    Fund changed its name to Eaton Vance Balanced Fund.


                                      11
<PAGE>
Eaton Vance Balanced Fund as of December 31, 1998

INDEPENDENT ACCOUNTANTS' REPORT


To the Trustees and Shareholders
of Eaton Vance Balanced Fund:
- --------------------------------------------------------------------------------
In our opinion, the accompanying statement of assets and liabilities and the
related statements of operations and of changes in net assets and supplementary
data present fairly, in all material respects, the financial position of Eaton
Vance Balanced Fund (the Fund) (formerly EV Traditional Investors Fund) at
December 31, 1998, the results of its operations for the year then ended, the
changes in its net assets for each of the two years in the period then ended and
the financial highlights for the periods indicated, in conformity with generally
accepted accounting principles. These financial statements and financial
highlights (hereafter referred to as "financial statements") are the
responsibility of the Fund's management; our responsibility is to express an
opinion on these financial statements based on our audits. We conducted our
audits of these financial statements in accordance with generally accepted
auditing standards which require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements, assessing the
accounting principles used and significant estimates made by management, and
evaluating the overall financial statement presentation. We believe that our
audits provide a reasonable basis for the opinion expressed above.



                          PricewaterhouseCoopers LLP
                          Boston, Massachusetts
                          February 5, 1999


                                      12
<PAGE>
 
Balanced Portfolio as of December 31, 1998

PORTFOLIO OF INVESTMENTS
<TABLE> 
<CAPTION> 
Common Stocks  62.5%    
Security                                 Shares             Value 
- --------------------------------------------------------------------------------
<S>                                      <C>                <C> 
Aerospace and Defense -- 1.5%                                             
- --------------------------------------------------------------------------------
General Motors Corp., Class H(1)         130,000            $  5,159,375 
- --------------------------------------------------------------------------------
                                                            $  5,159,375 
- --------------------------------------------------------------------------------

Auto and Parts -- 2.5%                                                    
- --------------------------------------------------------------------------------
General Motors Corp.                      60,000            $  4,293,750 
Magna International, Inc., Class A        75,000               4,650,000 
- --------------------------------------------------------------------------------
                                                            $  8,943,750 
- --------------------------------------------------------------------------------

Banks - Regional -- 2.3%                                                  
- --------------------------------------------------------------------------------
BankBoston Corp.                          90,000            $  3,504,375 
Wells Fargo & Co.                        120,000               4,792,500 
- --------------------------------------------------------------------------------
                                                            $  8,296,875 
- --------------------------------------------------------------------------------

Banks and Money Services -- 0.3%                                          
- --------------------------------------------------------------------------------
Banco Latinoamericano de                  
Exportaciones(2)                          75,000            $  1,246,875 
- --------------------------------------------------------------------------------
                                                            $  1,246,875 
- --------------------------------------------------------------------------------

Beverages -- 0.9%                                                         
- --------------------------------------------------------------------------------
PepsiCo, Inc.                             80,000            $  3,275,000 
- --------------------------------------------------------------------------------
                                                            $  3,275,000 
- --------------------------------------------------------------------------------

Broadcasting and Cable -- 1.2%                                            
- --------------------------------------------------------------------------------
MediaOne Group, Inc.(1)                   90,000            $  4,230,000 
- --------------------------------------------------------------------------------
                                                            $  4,230,000 
- --------------------------------------------------------------------------------

Chemicals -- 0.8%                                                         
- --------------------------------------------------------------------------------
Praxair, Inc.                             80,000            $  2,820,000 
- --------------------------------------------------------------------------------
                                                            $  2,820,000 
- --------------------------------------------------------------------------------

Distribution Services -- 1.2%                                             
- --------------------------------------------------------------------------------
Bergen Brunswig Corp., Class A           120,000            $  4,185,000 
- --------------------------------------------------------------------------------
                                                            $  4,185,000 
- --------------------------------------------------------------------------------

Drugs -- 6.8%                                                             
- --------------------------------------------------------------------------------
Elan Corp., PLC ADR(1)(2)                 65,000            $  4,521,563 
Pfizer, Inc.                              37,800               4,741,538 
Sepracor, Inc.(1)                        100,000               8,812,499 
Warner-Lambert Co.                        80,000               6,015,000 
- --------------------------------------------------------------------------------
                                                            $ 24,090,600 
- --------------------------------------------------------------------------------

Electric Utilities -- 1.1%                                                
- --------------------------------------------------------------------------------
The Southern Co.                         140,000            $  4,068,750 
- --------------------------------------------------------------------------------
                                                            $  4,068,750 
- --------------------------------------------------------------------------------

Electronics - Semiconductors -- 1.0%                                      
- --------------------------------------------------------------------------------
Intel Corp.                               30,000            $  3,556,875 
- --------------------------------------------------------------------------------
                                                            $  3,556,875 
- --------------------------------------------------------------------------------

Environmental Services -- 1.6%                                            
- --------------------------------------------------------------------------------
Waste Management, Inc.                   120,000            $  5,595,000 
- --------------------------------------------------------------------------------
                                                            $  5,595,000 
- --------------------------------------------------------------------------------

Financial - Miscellaneous -- 2.9%                                         
- --------------------------------------------------------------------------------
Fannie Mae                                45,000            $  3,330,000 
MBNA Corp.                               180,000               4,488,750 
MGIC Investment Corp.                     65,000               2,587,813 
- --------------------------------------------------------------------------------
                                                            $ 10,406,563 
- --------------------------------------------------------------------------------

Foods -- 3.7%                                                             
- --------------------------------------------------------------------------------
Tyson Foods, Inc.                        264,700            $  5,624,875 
Unilever ADR(2)                           92,000               7,630,250 
- --------------------------------------------------------------------------------
                                                            $ 13,255,125 
- --------------------------------------------------------------------------------

Health Services -- 0.7%                                                   
- --------------------------------------------------------------------------------
HCR Manor Care, Inc.(1)                   90,000            $  2,643,750 
- --------------------------------------------------------------------------------
                                                            $  2,643,750 
- --------------------------------------------------------------------------------

Information Services -- 1.5%                                              
- --------------------------------------------------------------------------------
Reynolds & Reynolds, Inc., Class A       225,000            $  5,160,938 
- --------------------------------------------------------------------------------
                                                            $  5,160,938 
- --------------------------------------------------------------------------------

Insurance -- 7.6%                                                         
- --------------------------------------------------------------------------------
Allstate Corp. (The)                      80,000            $  3,090,000 
Berkshire Hathaway, Inc., Class B(1)       2,100               4,935,000 
</TABLE> 

                       See notes to financial statements

                                      13
<PAGE>
 
Balanced Portfolio as of December 31, 1998

PORTFOLIO OF INVESTMENTS CONT'D
<TABLE> 
<CAPTION> 
Security                                 Shares             Value               
- --------------------------------------------------------------------------------
<S>                                      <C>                <C> 
Insurance (continued)                                                    
- --------------------------------------------------------------------------------
Mercury General Corp.                    100,000            $  4,381,250 
Mutual Risk Management Ltd.              186,600               7,300,725 
SunAmerica, Inc.                          90,000               7,301,250 
- --------------------------------------------------------------------------------
                                                            $ 27,008,225 
- --------------------------------------------------------------------------------

Medical Products -- 4.2%                                                  
- --------------------------------------------------------------------------------
Baxter International, Inc.                55,000            $  3,537,188 
Boston Scientific Corp.(1)               150,000               4,021,875 
Sofamor Danek Group, Inc.(1)              60,300               7,341,525 
- --------------------------------------------------------------------------------
                                                            $ 14,900,588 
- --------------------------------------------------------------------------------

Metals and Minerals -- 1.5%                                               
- --------------------------------------------------------------------------------
Potash Corp. of Saskatchewan(2)           55,000            $  3,513,125 
Steel Dynamics Corp.(1)                  150,000               1,762,500 
- --------------------------------------------------------------------------------
                                                            $  5,275,625 
- --------------------------------------------------------------------------------

Oil and Gas - Equipment and Services -- 0.4%                              
- --------------------------------------------------------------------------------
Rowan Companies, Inc.(1)                 140,000            $  1,400,000 
- --------------------------------------------------------------------------------
                                                            $  1,400,000 
- --------------------------------------------------------------------------------

Oil and Gas - Exploration and Production -- 1.0%
- --------------------------------------------------------------------------------
Anadarko Petroleum Corp.                  70,000            $  2,161,250 
Triton Energy, Ltd.(1)(2)                190,000               1,508,125 
- --------------------------------------------------------------------------------
                                                            $  3,669,375 
- --------------------------------------------------------------------------------

Oil and Gas - Integrated -- 2.4%                                          
- --------------------------------------------------------------------------------
Exxon Corp.                               67,280            $  4,919,850 
Mobil Corp.                               40,000               3,485,000 
- --------------------------------------------------------------------------------
                                                            $  8,404,850 
- --------------------------------------------------------------------------------

Paper and Forest Products -- 0.7%                                         
- --------------------------------------------------------------------------------
Plum Creek Timber Co., L.P.               90,000            $  2,345,625 
- --------------------------------------------------------------------------------
                                                            $  2,345,625 
- --------------------------------------------------------------------------------

Publishing -- 1.4%                                                        
- --------------------------------------------------------------------------------
Central Newspapers, Inc., Class A         70,000            $  5,000,625 
- --------------------------------------------------------------------------------
                                                            $  5,000,625 
- --------------------------------------------------------------------------------

REITS -- 2.8%                                                             
- --------------------------------------------------------------------------------
Equity Office Properties Trust           110,000            $  2,640,000 
Equity Residential Properties Trust      101,400               4,100,363 
Prologis Trust                           150,000               3,112,500 
- --------------------------------------------------------------------------------
                                                            $  9,852,863 
- --------------------------------------------------------------------------------

Retail - Food and Drug -- 4.0%                                            
- --------------------------------------------------------------------------------
Albertson's, Inc.                         80,000            $  5,095,000 
CVS Corp.                                100,000               5,500,000 
Safeway, Inc.(1)                          60,000               3,656,250 
- --------------------------------------------------------------------------------
                                                            $ 14,251,250 
- --------------------------------------------------------------------------------

Retail - Specialty and Apparel -- 2.0%                                    
- --------------------------------------------------------------------------------
Home Depot, Inc. (The)                    50,000            $  3,059,375 
Republic Industries, Inc.(1)             270,000               3,982,500 
- --------------------------------------------------------------------------------
                                                            $  7,041,875 
- --------------------------------------------------------------------------------

Specialty Chemicals and Materials -- 1.7%                                 
- --------------------------------------------------------------------------------
Corning, Inc.                             80,000            $  3,600,000 
Millipore Corp.                           80,000               2,275,000 
- --------------------------------------------------------------------------------
                                                            $  5,875,000 
- --------------------------------------------------------------------------------

Telecommunications Services -- 2.8%                                       
- --------------------------------------------------------------------------------
Ameritech Corp.                           80,896            $  5,126,784 
GTE Corp.                                 75,000               4,875,000 
- --------------------------------------------------------------------------------
                                                            $ 10,001,784 
- --------------------------------------------------------------------------------

Total Common Stocks                                                      
    (identified cost $152,703,403)                          $221,962,161 
- --------------------------------------------------------------------------------
</TABLE> 

                       See notes to financial statements

                                      14
<PAGE>
 
Balanced Portfolio as of December 31, 1998

PORTFOLIO OF INVESTMENTS CONT'D

Convertible Preferred Stock -- 0.5% 
                                                                                


Security                                 Shares             Value 
- --------------------------------------------------------------------------------

Metals - Gold -- 0.5%                                                     
- --------------------------------------------------------------------------------
Freeport McMoRan Copper & Gold,
5% Series CV                             125,000            $  1,859,375 
- --------------------------------------------------------------------------------
                                                            $  1,859,375 
- --------------------------------------------------------------------------------

Total Convertible Preferred Stock                                        
    (identified cost $2,872,498)                            $  1,859,375 
- --------------------------------------------------------------------------------

Rights -- 0.0%

Security                                 Shares             Value 
- --------------------------------------------------------------------------------

Oil and Gas - Exploration and Production -- 0.0%
- --------------------------------------------------------------------------------
Triton Energy, Ltd.(1)(2)                 13,680            $          0 
- --------------------------------------------------------------------------------

Total Rights                                                             
    (identified cost $0)                                    $          0 
- --------------------------------------------------------------------------------

Corporate Bonds -- 22.4%                                                     


                                         Principal
                                         Amount
                                         (000's              
Security                                 Omitted)           Value   
- --------------------------------------------------------------------------------
Air Products and Chemicals, Inc., 7.34%, 
 6/15/26                                 $   720            $    808,078 
Associates Corp., N.A., 5.96%,             
5/15/37                                    4,280               4,277,988 
Bell Telephone Co., 8.35%, 12/15/30        3,000               3,905,550 
Chesapeake Potomac Telephone Co.,
8.375%, 10/1/29                            2,850               3,700,098 
Commercial Credit Corp., 7.875%,           
2/1/25                                     2,000               2,359,540 
Commercial Credit Corp., 6.625%,           
6/1/15                                     1,350               1,431,081 
Connecticut Light and Power Co., 7.875%,   
10/1/24                                    3,775               4,565,447 
Dayton Hudson,  MTN, 5.865%, 8/15/27       2,490               2,579,018 
General Motors Corp., 9.45%, 11/1/11       3,000               3,932,250 
Grand Metropolitan Investments
Corp.,                                     
7.45%, 4/15/35                             3,090               3,574,728 
Intermediate American Development
Bank, 8.40%, 9/1/09                        3,690               4,543,755 
Intermediate American Development
Bank, 6.95%, 8/1/26                          220                 246,640 
International Finance Corp., MTN,                                        
5.067%, 4/20/03                            5,000               4,944,450
J.C. Penney, Inc., 7.40%, 4/1/37           3,500               3,805,060 
Johnson Controls, Inc., 7.70%,             
3/1/15                                     1,360               1,508,226 
Lowe's Cos., Inc., 7.11%, 5/15/37          5,000               5,472,350 
Mead Corp. (The), 6.84%, 3/1/37            2,000               2,083,040 
Proctor and Gamble Co., 8.00%,             
9/1/24                                     3,000               3,770,580 
Seagram (Joseph) & Sons, Inc., 9.65%,      
8/15/18                                    1,030               1,238,287 
State Street Bank, 7.35%, 6/15/26          2,450               2,734,543 
Tennessee Valley Power Authority,            
6.235%, 7/15/45                              700                 733,439 
Tennessee Valley Power Authority, 5.88%,   
4/1/36                                     3,350               3,554,819 
Times Mirror Co., 6.61%, 9/15/27           3,250               3,244,703 
Tribune Co., 6.25%, 11/10/26               1,000                 994,960 
TRW, Inc., MTN, 9.35%, 6/4/20                995               1,307,370 
Willamette Industries, 7.35%, 7/1/26       4,000               4,250,560 
Xerox Corp., 5.90%, 5/5/37                 3,000               3,077,610 
Xerox Corp., 5.875%, 6/15/37               1,000               1,024,620 
- --------------------------------------------------------------------------------

Total Corporate Bonds                                                    
    (identified cost $75,378,545)                           $ 79,668,790 
- --------------------------------------------------------------------------------

Mortgage Pass-Throughs -- 1.1%                                               

                                         Principal
                                         Amount
                                         (000's                 
Security                                 Omitted)           Value
- --------------------------------------------------------------------------------
FHLMC, PAC, CMO, Series 1630-PE,         
5.50%, 5/15/18                           $ 1,407            $  1,404,417 
FHLMC, PAC, CMO, Series 34-C, 9.00%,         
11/15/19                                     125                 126,008 
FHLMC, PAC, CMO, Series 41-F, 10.00%,      
5/15/20                                    1,279               1,388,475 
FNMA, PAC, CMO, Series 1990 24-E,            
9.00%, 3/25/20                               941                 973,538
- --------------------------------------------------------------------------------
                                                                         
Total Mortgage Pass-Throughs                                             
    (identified cost $3,710,787)                            $  3,892,438 
- --------------------------------------------------------------------------------

U.S. Treasury Obligations -- 11.7%                                           

                                         Principal
                                         Amount
                                         (000's                 
Security                                 Omitted)           Value
- --------------------------------------------------------------------------------
U.S. Treasury Note, 5.75%, 11/30/02      $18,000            $ 18,660,959 
U.S. Treasury Note, 7.125%, 9/30/99        3,000               3,053,430 
U.S. Treasury Note, 6.125%, 9/30/00        4,000               4,098,120 
U.S. Treasury Note, 8.50%, 2/15/00        15,000              15,616,349 
- --------------------------------------------------------------------------------
                                                                         
Total U.S. Treasury Obligations                                          
    (identified cost $41,187,131)                           $ 41,428,858 
- --------------------------------------------------------------------------------

                       See notes to financial statements

                                      15
<PAGE>
 
Balanced Portfolio as of December 31, 1998

PORTFOLIO OF INVESTMENTS CONT'D


Commercial Paper -- 1.1%

                                         Principal
                                         Amount
                                         (000's                 
Security                                 Omitted)           Value
- --------------------------------------------------------------------------------
General Electric Capital Corp.,          
 5.50%, 1/4/99                           $ 3,891            $  3,889,217 
- --------------------------------------------------------------------------------
                                                                         
Total Commercial Paper                                                   
    (amortized cost $3,889,217)                             $  3,889,217 
- --------------------------------------------------------------------------------

Total Investments -- 99.3%                                                
    (identified cost $279,741,581)                          $352,700,839 
- --------------------------------------------------------------------------------

Other Assets, Less Liabilities -- 0.7%                       $  2,652,219  
- --------------------------------------------------------------------------------

Net Assets -- 100%                                           $355,353,058 
- --------------------------------------------------------------------------------

ADR - American Depositary Receipt
PAC - Planned Authorization Class
CMO - Collateralized Mortgage Obligations
REIT - Real Estate Investment Trust
(1) Non-income producing security.
(2) Foreign security.


                       See notes to financial statements

                                      16
<PAGE>
Balanced Portfolio as of December 31, 1998

FINANCIAL STATEMENTS

Statement of Assets and Liabilities                                             


As of December 31, 1998                                                
Assets                                                                 
- --------------------------------------------------------------------------------
Investments, at value (identified cost, $279,741,581)        $352,700,839 
Cash                                                              392,256 
Interest and dividends receivable                               2,282,453 
Tax reclaim receivable                                              4,163 
- --------------------------------------------------------------------------------
Total assets                                                 $355,379,711 
- --------------------------------------------------------------------------------


Liabilities                                                            
- --------------------------------------------------------------------------------
Payable to affiliate for Trustees' fees                      $      4,881 
Other accrued expenses                                             21,772 
- --------------------------------------------------------------------------------
Total liabilities                                            $     26,653 
- --------------------------------------------------------------------------------
Net Assets applicable to investors' interest in            
    Portfolio                                                $355,353,058 
- --------------------------------------------------------------------------------


Sources of Net Assets                                                  
- --------------------------------------------------------------------------------
Net proceeds from capital contributions and withdrawals      $282,393,800 
    
Net unrealized appreciation (computed on the basis            
    of identified cost)                                        72,959,258 
- --------------------------------------------------------------------------------
Total                                                        $355,353,058 
- --------------------------------------------------------------------------------

Statement of Operations

For the Year Ended
December 31, 1998                                                      
Investment Income                                                      
- --------------------------------------------------------------------------------
Dividends (net of foreign taxes, $48,178)                    $  4,082,039 
Interest                                                        7,922,884 
- --------------------------------------------------------------------------------
Total investment income                                      $ 12,004,923 
- --------------------------------------------------------------------------------


Expenses                                                               
- --------------------------------------------------------------------------------
Investment adviser fee                                       $  2,132,133 
Trustees fees and expenses                                         19,251 
Custodian fee                                                     171,124 
Legal and accounting services                                      30,398 
Amortization of organization expenses                               2,113 
Miscellaneous                                                       4,199 
- --------------------------------------------------------------------------------
Total expenses                                               $  2,359,218 
- --------------------------------------------------------------------------------

Net investment income                                        $  9,645,705 
- --------------------------------------------------------------------------------


Realized and Unrealized
Gain (Loss)                                                              
- --------------------------------------------------------------------------------
Net realized gain (loss) --                                               
    Investment transactions (identified cost basis)          $ 56,088,137 
- --------------------------------------------------------------------------------
Net realized gain                                            $ 56,088,137 
- --------------------------------------------------------------------------------
Change in unrealized appreciation (depreciation) --                       
    Investments (identified cost basis)                      $(20,974,301)
- --------------------------------------------------------------------------------
Net change in unrealized appreciation (depreciation)         $(20,974,301)
- --------------------------------------------------------------------------------

Net realized and unrealized gain                             $ 35,113,836 
- --------------------------------------------------------------------------------

Net increase in net assets from operations                   $ 44,759,541 
- --------------------------------------------------------------------------------



                       See notes to financial statements

                                      17
<PAGE>
Balanced Portfolio as of December 31, 1998 

FINANCIAL STATEMENTS CONT'D

Statements of Changes in Net Assets


Increase (Decrease)              Year Ended             Year Ended
in Net Assets                    December 31, 1998      December 31, 1997  
- --------------------------------------------------------------------------------
From operations --                                                        
    Net investment income             $  9,645,705           $  8,365,076 
    Net realized gain                   56,088,137             24,802,364 
    Net change in unrealized
        appreciation                   (20,974,301)            29,330,948 
        (depreciation)
- --------------------------------------------------------------------------------
Net increase in net assets
    from operations                   $ 44,759,541           $ 62,498,388 
- --------------------------------------------------------------------------------
Capital transactions --                                                  
    Contributions                     $ 38,451,067           $ 27,019,040 
    Withdrawals                        (57,564,792)           (61,370,968)
- --------------------------------------------------------------------------------
Net decrease in net assets
    from capital transactions         $(19,113,725)          $(34,351,928)
- --------------------------------------------------------------------------------

Net increase in net assets            $ 25,645,816           $ 28,146,460 
- --------------------------------------------------------------------------------


Net Assets                                                              
- --------------------------------------------------------------------------------
At beginning of year                  $329,707,242           $301,560,782 
- --------------------------------------------------------------------------------
At end of year                        $355,353,058           $329,707,242 
- --------------------------------------------------------------------------------





                       See notes to financial statements

                                      18

<PAGE>
Balanced Portfolio as of December 31, 1998

FINANCIAL STATEMENTS CONT'D

Supplementary Data

<TABLE> 
<CAPTION> 
                                                                                                                      Year Ended
                                                                    Year Ended December 31,                           January 31,
                                               -----------------------------------------------------------------    ----------------
                                                1998               1997              1996              1995(1)           1995 
- ------------------------------------------------------------------------------------------------------------------------------------

Ratios to average daily net assets                                                                                             
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                           <C>               <C>               <C>               <C>               <C> 
Expenses                                          0.67%             0.69%             0.70%             0.71%(2)           0.70%
Net investment income                             2.75%             2.62%             3.23%             3.83%(2)           4.25%
Portfolio Turnover                                  49%               37%               64%               47%                28%
- ------------------------------------------------------------------------------------------------------------------------------------
Net assets, end of year (000's omitted)       $355,353          $329,707          $301,561          $276,375          $ 217,157 
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE> 
(1) For the eleven-month period ended December 31, 1995.
(2) Annualized.




                       See notes to financial statements

                                      19
<PAGE>
 
Balanced Portfolio as of December 31, 1998

NOTES TO FINANCIAL STATEMENTS 


1   Significant Accounting Policies
    ----------------------------------------------------------------------------
    Balanced Portfolio (the "Portfolio") (formerly Investors Portfolio) is
    registered under the Investment Company Act of 1940, as a diversified,
    open-end, management investment company which was organized as a trust under
    the laws of the State of New York in 1992. The Declaration of Trust permits
    the Trustees to issue interests in the Portfolio. The following is a summary
    of significant accounting policies of the Portfolio. The policies are in
    conformity with generally accepted accounting principles.

    A Investment Valuations -- Marketable securities, including options, that
    are listed on foreign or U.S. securities exchanges or in the NASDAQ National
    Market System are valued at closing sale prices, on the exchange where such
    securities are principally traded. Listed or unlisted securities for which
    closing sale prices are not available are valued at the mean between latest
    bid and asked prices. Debt securities (other than mortgage-backed "pass
    through" securities and short-term obligations maturing in sixty days or
    less), including listed securities and securities for which price quotations
    are available and forward contracts, will normally be valued on the basis of
    market valuations furnished by pricing services. Mortgage-backed, "pass
    through" securities are valued using an independent matrix pricing system
    applied by the adviser which takes into account closing bond valuations,
    yield differentials, anticipated prepayments and interest rates provided by
    dealers. Short-term obligations and money market securities maturing in 60
    days or less are valued at amortized cost which approximates value. Non-U.S.
    dollar denominated short-term obligations are valued at amortized cost as
    calculated in the base currency and translated to U.S. dollars at the
    current exchange rate. Investments for which valuations or market quotations
    are unavailable are valued at fair value using methods determined in good
    faith by or at the direction of the Trustees.

    B Income -- Interest income is determined on the basis of interest accrued,
    adjusted for amortization of premium or discount when required for federal
    income tax purposes. Dividend income is recorded on the ex-dividend date for
    dividends received in cash and/or securities. However, if the ex-dividend
    date has passed, certain dividends from foreign securities are recorded as
    the Portfolio is informed of the ex-dividend date. Dividend income may
    include dividends that represent returns of capital for federal income tax
    purposes.

    C Income Taxes -- The Portfolio has elected to be treated as a partnership
    for United States Federal tax purposes. No provision is made by the
    Portfolio for federal or state taxes on any taxable income of the Portfolio
    because each investor in the Portfolio is ultimately responsible for the
    payment of any taxes. Since some of the Portfolio's investors are regulated
    investment companies that invest all or substantially all of their assets in
    the Portfolio, the Portfolio normally must satisfy the applicable source of
    income and diversification requirements (under the Internal Revenue Code) in
    order for its investors to satisfy them. The Portfolio will allocate at
    least annually among its investors each investor's distributive share of the
    Portfolio's net investment income, net realized capital gains, and any other
    items of income, gain, loss, deduction or credit. Withholding taxes on
    foreign dividends and capital gains have been provided for in accordance
    with the Portfolio's understanding of the applicable countries' tax rules
    and rates.

    D Foreign Currency Translation -- Investment valuations, other assets, and
    liabilities initially expressed in foreign currencies are converted each
    business day into U.S. dollars based upon current exchange rates. Purchases
    and sales of foreign investment securities and income and expenses are
    converted into U.S. dollars based upon currency exchange rates prevailing
    on the respective dates of such transactions. Recognized gains or losses on
    investment transactions attributable to foreign currency rates are recorded
    for financial statement purposes as net realized gains and losses on
    investments. That portion of unrealized gains and losses on investments
    that result from fluctuations in foreign currency exchange rates are not
    separately disclosed.

    E Deferred Organization Expenses -- Costs incurred by the Portfolio in
    connection with its organization are being amortized on a straight-line
    basis over five years.

    F Other -- Investment transactions are accounted for on a trade date basis.

    G Use of Estimates -- 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 at the date of the financial statements and the reported
    amounts of income and expense during the reporting period. Actual results
    could differ from those estimates.


                                      20
<PAGE>
 
Balanced Portfolio as of December 31, 1998

NOTES TO FINANCIAL STATEMENTS CONT'D


2   Investment Adviser Fee and Other Transactions with Affiliates
- --------------------------------------------------------------------------------
    The investment adviser fee is earned by Boston Management and Research
    (BMR), a wholly-owned subsidiary of Eaton Vance Management (EVM), as
    compensation for management and investment advisory services rendered to the
    Portfolio. The fee is computed at the monthly rate of 5/96 of 1% (0.625%
    annually) of the Portfolio's average daily net assets up to $300 million and
    at reduced rates as daily net assets exceed that level. For the year ended
    December 31, 1998 the fee was equivalent to 0.61% of the Portfolio's average
    net assets for such period and amounted to $2,132,133. Except as to Trustees
    of the Portfolio who are not members of EVM's or BMR's organization,
    officers and Trustees receive remuneration for their service to the
    Portfolio out of such investment adviser fee. Certain of the officers and
    Trustees of the Portfolio are officers and directors/trustees of the above
    organizations. Trustees of the Portfolio that are not affiliated with the
    Investment Adviser may elect to defer receipt of all or a portion of their
    annual fees in accordance with the terms of the Trustees Deferred
    Compensation Plan. For the year ended December 31, 1998, no significant
    amounts have been deferred.

3   Investments Transaction
- --------------------------------------------------------------------------------
    Purchases and sales of investments, other than U.S. Government securities
    and short-term obligations, aggregated $108,317,908 and $119,710,077,
    respectively. Purchases and sales of U.S. Government/agency securities
    aggregated $56,534,907 and $57,471,292, respectively.

4   Federal Income Tax Basis of Investments
- --------------------------------------------------------------------------------
    The cost and unrealized appreciation (depreciation) in the value of
    investments owned at December, 31 1998, as computed on a federal income tax
    basis, are as follows:


    Aggregate cost                                          $279,741,581
    ----------------------------------------------------------------------------
    Gross unrealized appreciation
                                                             $91,503,496
    Gross unrealized depreciation                            (18,544,238)
    ----------------------------------------------------------------------------

    Net unrealized appreciation                              $72,959,258
    ----------------------------------------------------------------------------

5   Line of Credit
- --------------------------------------------------------------------------------
    The Portfolio participates with other portfolios and funds managed by BMR
    and EVM and its affiliates in a $130 million unsecured line of credit
    agreement with a group of banks. The Portfolio may temporarily borrow from
    the line of credit to satisfy redemption requests or settle investment
    transactions. Interest is charged to each portfolio or fund based on its
    borrowings at an amount above the Eurodollar rate or federal funds rate. In
    addition, a fee computed at an annual rate of 0.10% on the daily unused
    portion of the line of credit is allocated among the participating
    portfolios and funds at the end of each quarter. The Portfolio did not have
    any significant borrowings or allocated fees during the period.

6   Risk Associated with Foreign Investments
- --------------------------------------------------------------------------------
    Investing in securities issued by companies whose principal business
    activities are outside the United States may involve significant risks not
    present in domestic investments. For example, there is generally less
    publicly available information about foreign companies, particularly those
    not subject to the disclosure and reporting requirements of the U.S.
    securities laws. Foreign issuers are generally not bound by uniform
    accounting, auditing, and financial reporting requirements and standards of
    practice comparable to those applicable to domestic issuers. Investments in
    foreign securities also involve the risk of possible adverse changes in
    investment or exchange control regulations, expropriation or confiscatory
    taxation, limitation on the removal of funds or other assets of the
    Portfolio, political or financial instability or diplomatic and other
    developments which could affect such investments. Foreign stock markets,
    while growing in volume and sophistication, are generally not as developed
    as those in the United States, and securities of some foreign issuers
    (particularly those located in developing countries) may be less liquid and
    more volatile than securities of comparable U.S. companies. In general,
    there is less overall governmental supervision and regulation of foreign
    securities markets, broker-dealers and issuers than in the United States.

7   Name Change
- --------------------------------------------------------------------------------
    Effective May 1, 1998, the Investors Portfolio changed its name to the
    Balanced Portfolio.


                                      21
<PAGE>
Balanced Portfolio as of December 31, 1998

INDEPENDENT ACCOUNTANTS' REPORT


To the Trustees and Shareholders
of Balanced Portfolio:
- --------------------------------------------------------------------------------
In our opinion, the accompanying statement of assets and liabilities, including
the schedule of investments, and the related statements of operations and of
changes in net assets and supplementary data present fairly, in all material
respects, the financial position of Balanced Portfolio (the Portfolio) (formerly
Investors Portfolio) at December 31, 1998, the results of its operations for the
year then ended, the changes in its net assets for each of the two years in the
period then ended and the supplementary data for each of the three years then
ended, the eleven-month period ended December 31, 1995 and for the year ended
January 31, 1995, in conformity with generally accepted accounting principles.
These financial statements and supplementary data (hereafter referred to as
financial statements) are the responsibility of the Portfolio's management; our
responsibility is to express an opinion on these financial statements based on
our audits. We conducted our audits of these financial statements in accordance
with generally accepted auditing standards which require that we plan and
perform the audits to obtain reasonable assurance about whether the financial
statements are free of material misstatement. An audit includes examining, on a
test basis, evidence supporting the amounts and disclosures in the financial
statements, assessing the accounting principles used and significant estimates
made by management, and evaluating the overall financial statement presentation.
We believe that our audits, which included confirmation of securities at
December 31, 1998 by correspondence with the custodian and brokers, provide a
reasonable basis for the opinion expressed above.



                          PricewaterhouseCoopers LLP
                          Boston, Massachusetts
                          February 5, 1999



                                      22
<PAGE>
Eaton Vance Balanced Fund as of December 31, 1998

INVESTMENT MANAGEMENT


Eaton Vance Balanced Fund

             Officers                Independent Trustees                      
             James B. Hawkes         Jessica M. Bibliowicz                     
             President and Trustee   President and Chief Operating Officer,    
                                     John A. Levin & Co.                       
             Edward E. Smiley, Jr    Director, Baker, Fentress & Company       
             Vice President                                                    
                                     Donald R. Dwight                          
             James L. O'Connor       President, Dwight Partners, Inc.          
             Treasurer                                                         
                                     Samuel L. Hayes, III                      
             Alan R. Dynner          Jacob H. Schiff Professor of Investment   
             Secretary               Banking, Emeritus, Harvard University     
                                     Graduate School of Business Administration
                                                                               
                                     Norton H. Reamer                          
                                     Chairman and Chief Executive Officer,     
                                     United Asset Management Corporation       
                                                                               
                                     Lynn A. Stout                             
                                     Professor of Law, Georgetown              
                                     University Law Center                     
                                                                               
                                     John L. Thorndike                         
                                     Formerly Director, Fiduciary Company 
                                     Incorporated

                                     Jack L. Treynor 
                                     Investment Adviser and Consultant 
                                                                       
                                                                       

Balanced Portfolio

             Officers                Independent Trustees                   
             James B. Hawkes         Jessica M. Bibliowicz                  
             President and Trustee   President and Chief Operating Officer, 
                                     John A. Levin & Co.                    
             Thomas E. Faust, Jr.    Director, Baker, Fentress & Company    
             Vice President and                                             
             Portfolio Manager       Donald R. Dwight                       
                                     President, Dwight Partners, Inc.       
             James L. O'Connor                                              
             Treasurer               Samuel L. Hayes, III                   
                                     Jacob H. Schiff Professor of Investment
             Alan R. Dynner          Banking, Emeritus, Harvard University  
             Secretary               Graduate School of Business Administration
                                                                               
                                     Norton H. Reamer                         
                                     Chairman and Chief Executive Officer,    
                                     United Asset Management Corporation      
                                                                              
                                     Lynn A. Stout                            
                                     Professor of Law, Georgetown             
                                     University Law Center                    
                                                                              
                                     John L. Thorndike                        
                                     Formerly Director, Fiduciary Company 
                                     Incorporated
                                                                              
                                     Jack L. Treynor                          
                                     Investment Adviser and Consultant        
                           


                                      23
<PAGE>

Investment Adviser of
Balanced Portfolio
Boston Management and Research
24 Federal Street
Boston, MA 02110


Administrator of
Eaton Vance Balanced Fund
Eaton Vance Management
24 Federal Street
Boston, MA 02110


Underwriter
Eaton Vance Distributors, Inc.
24 Federal Street
Boston, MA 02110
(617) 482-8260


Custodian
Investors Bank & Trust Company
200 Clarendon Street, 16th Floor
Boston, MA 02116


Transfer and Dividend
Disbursing Agent
First Data Investor Services Group
Attention:  Eaton Vance Funds
P.O. Box 5123
Westborough, MA 01581-5123


Independent Accountants
PricewaterhouseCoopers LLP
One Post Office Square
Boston, MA 02109



Eaton Vance  Balanced Fund
24 Federal Street
Boston, MA 02110



- --------------------------------------------------------------------------------
This report must be preceded or accompanied by a current prospectus which
contains more complete information on the Fund, including its sales charges and
expenses. Please read the prospectus carefully before you invest or send money.
- --------------------------------------------------------------------------------

                                                                     BALSRC-2/99



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