EATON VANCE SPECIAL INVESTMENT TRUST
N-30D, 1997-03-06
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<PAGE>

INVESTMENT ADVISER OF
STOCK PORTFOLIO
Boston Management and Research
24 Federal Street
Boston, MA 02110

ADMINISTRATOR OF EV MARATHON
STOCK FUND
Eaton Vance Management
24 Federal Street
Boston, MA 02110

PRINCIPAL UNDERWRITER
Eaton Vance Distributors, Inc.
24 Federal Street
Boston, MA 02110
(800) 482-8260

CUSTODIAN
Investors Bank & Trust Company
89 South Street
P.O. Box 1537
Boston, MA 02205-1537

TRANSFER AGENT AND DIVIDEND DISBURSING AGENT
First Data Investor Services Group
Attn: Eaton Vance Funds
P.O. Box 5123
Westborough, MA 01581-5123

INDEPENDENT ACCOUNTANTS
Coopers & Lybrand L.L.P.
One Post Office Square
Boston, Ma 02109


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


EV MARATHON STOCK FUND
24 FEDERAL STREET
BOSTON, MA 02110                                                   M-STSRC-2/97

                                     [Logo]

                                   EV Marathon
                                   Stock Fund


                                     Annual

                               Shareholder Report

                               December 31, 1996

<PAGE>

TO SHAREHOLDERS

We are pleased to report that during the year ended December 31, 1996, EV
Marathon Stock Fund had a total return of 18.7%. This return, which did not
include the maximum 5% contingent deferred sales charge (CDSC), resulted from
an increase in net asset value to $13.90 per share from $12.25 per share and the
reinvestment of $0.080 in income dividends and $0.532 per share in capital gain
distributions.

By comparison, the average total return for mutual funds in the Lipper Growth &
Income Funds Category,* a group of 523 mutual funds investing in growth and
income stocks, was 20.8% during the year. The S&P 500,* an unmanaged index of
common stocks, recorded a total return of 22.9% for the same period.

According to the U.S. Commerce Departments quarterly Gross Domestic Product
(GDP) report, which totals the value of all goods and services produced in the
U.S., the economy experienced a year of respectable growth, low inflation, and
rising employment in 1996. This advantageous mix of economic factors helped
produce another good year for stock market investors.

The annualized GDP was 2.0%, 4.7%, 2.1%, and 4.7% for the four quarters of 1996.
Inflation, as measured by the Consumer Price Index (CPI), was 3.3% for the year
(not seasonally adjusted). Unemployment remained a low 5.3% in December.

Led by large capitalization, blue chip stocks, the stock market performed very
well for a second straight year. The Dow Jones Industrial Average,* a key blue
chip stock barometer, dropped by roughly 10% in July, but rallied to record
highs through the second half of the year to gain 28.8% by December 31. In the
pages that follow, Portfolio Manager Duncan W. Richardson provides a more
detailed commentary on the stock market and the Funds performance during the
year.

Although past performance is no guarantee of future returns, Eaton Vance
believes that investing in a combination of income-producing and growth stocks
will provide solid returns over the long term.

                                        Sincerely,

                                        /s/ James B. Hawkes
[Photo of James B. Hawkes]                  ---------------
                                            James B. Hawkes
                                            President
                                            February 7, 1997

*It is not possible to invest directly in an index or a Lipper Category.
- --------------------------------------------------------------------------------

Fund shares are not guaranteed 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.

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

- --------------------------------------------------------------------------------
                             EV Marathon Stock Fund

                     The 10 largest common stock holdings*

Eastman Kodak Co. ................................................. Photography
Intel Corp. .................................................... Semiconductors
Conagra, Inc. ..................................................... Agriculture
Boeing Co. .................................................. Aerospace-Defense
Allstate Corp. ...................................................... Insurance
Triton Energy Ltd. ..................................................... Energy
Crown Cork & Seal, Inc. ............................................ Containers
Nokia Corp. ADR ......................................  Electronics-Instruments
Citicorp .............................................................. Banking
Home Depot, Inc. ..................................... Retail-Consumer services

*By market value as of 12/31/96. Holdings may change due to active management.
- --------------------------------------------------------------------------------
<PAGE>
- --------------------------------------------------------------------------------
MANAGEMENT REPORT

An interview with Duncan W. Richardson, Vice President and Portfolio Manager of
Stock Portfolio.

Q. CONGRATULATIONS ON ANOTHER GOOD YEAR. WHAT WERE THE MAIN CHARACTERISTICS OF
   1996 FROM AN INVESTMENT STANDPOINT?

A. 1996 was another strong year for the equity markets, on top of a very good
   year in 1995. Together, 1995 and 1996 rank as two of the best consecutive
   years in the Stock Portfolios history. As the market continued its expansion,
   certain sectors experienced an increase in volatility. Technology stocks, for
   example, rallied into May, corrected more than other sectors in the July
   downturn, and then, on a selective basis, came back very strongly toward the
   end of the year. Fortunately, the stocks with the best performance in 1996
   were the high-quality, large capitalization companies in which this Portfolio
   invests.

Q. THIS FUNDS RETURN EXCEEDED THAT OF THE AVERAGE EQUITY FUND. TO WHAT DO YOU
   ATTRIBUTE THIS SUCCESS?

A. It was probably a combination of our selling discipline, which protects us on
   the downside and helps preserve capital, and our opportunism in adding to
   existing positions or acquiring new ones. Some funds were hurt by holding
   certain volatile sectors, such as technology, at the wrong time. This Fund
   establishes long-term core positions but actively manages them, taking some
   profits and reinvesting when the opportunities arise. Hence, rather than
   riding the ups and downs of the market, the Fund seeks to take advantage of
   buying and selling opportunities in an effort to produce better performance
   from its holdings.

Q. ARE THERE ANY COMPANIES THAT YOU WOULD LIKE TO HIGHLIGHT FOR SHAREHOLDERS
   READING THIS REPORT?

[Photo of Duncan W. Richardson]

A. Duracell is an excellent example. We initiated our position in this company
   on the basis of the underlying growth potential and then continued to add to
   our position. Our positive viewpoint was shared by Gillette, who recently
   acquired the company at a premium for stock. As a non-taxable transaction,
   this became a double win for shareholders.

   Other examples of long-term opportunities include Potash, Triton Energy, and
   Crown Cork and Seal. Potash, a recent addition to the Portfolio, makes
   fertilizer and, over the next several years, should capitalize on the demand
   from developing countries for this product. Potash's share price has
   appreciated 29% in the past six months, but more importantly, the company
   appears to have very good growth prospects. Triton Energy is an international
   oil exploration and production company, while Crown Cork and Seal, after a
   recent merger, is the largest container manufacturer in the world. All four
   of these companies fit our model of growth companies that are well-positioned
   in their industries, with worldwide market opportunities.

Q. HOW MUCH OF A GLOBAL PRESENCE DO THE HOLDINGS IN THIS FUND HAVE?

A. For the Fund in general, we like companies which have opportunities to grow
   their businesses overseas, particularly if those opportunities are not fully
   reflected in the stock price. Most of our current top holdings fall into this
   category, including Intel, Citicorp, Nokia, Bank of Boston, Eli Lilly,
   Boeing, Duracell, Procter & Gamble, and Xerox just to name a few.

Q. DOES THIS PORTFOLIO HAVE A GREAT DEAL OF TURNOVER?

A. The turnover rate has been somewhat higher than normal in recent years simply
   because the market has been more volatile. Some stocks have performed far
   better than we expected in a short period of time. As our targets were met, I
   have taken gains and reinvested in other opportunities.

   Our selling discipline for investments that are underperforming also
   increases turnover, but has two offsetting benefits. First, and most
   important, recognizing mistakes early on helps to preserve capital. Second,
   by taking losses when necessary, we can reduce the negative tax consequences
   of high distributions to taxable shareholders.

- --------------------------------------------------------------------------------
   HIGH-QUALITY STOCK HOLDINGS REAPED BENEFITS OF BLUE CHIP RALLY IN 1996 ...

                HYPOTHETICAL INVESTMENTS OF $10,000 IN DOW JONES
              INDUSTRIAL AVERAGE AND THE RUSSELL 2000 STOCK INDEX+

1996 Dow Jones & Russell 2000 Indexes

                             DOW JONES                   RUSSELL 2000
12/31/95                      10,000                        10,000
 1/31/96                      10,564                        10,062
 2/29/96                      10,761                        10,301
 3/31/96                      10,980                        10,514
 4/30/96                      10,966                        11,072
 5/31/96                      11,133                        11,509
 6/30/96                      11,177                        11,036
 7/31/96                      10,950                        10,072
 8/31/96                      11,145                        10,657
 9/30/96                      11,695                        11,073
10/31/96                      12,011                        10,903
11/30/96                      13,014                        11,352
12/31/96                      12,891                        11,649

+The Dow Jones Industrial Average is an unmanaged index of 30 large
 capitalization industrial stocks traded in the U.S. The Russell 2000 Stock
 Index is an index of 2,000 small capitalization stocks, many of which are in
 the technology sector. It is not possible to invest directly in an index.

                        WHILE INVESTING IN A DIVERSIFIED
                         ARRAY OF ECONOMIC SECTORS ...

                        SECTOR BREAKDOWN AS OF 12/31/96*

               Finance & Insurance ...................        12.5%
               Consumer Non-Durables .................        12.0%
               Health Care ...........................        10.4%
               Business Products & Services ..........         9.2%
               REITs .................................         6.8%
               Banks .................................         5.2%
               Retail ................................         4.6%
               Energy ................................         4.3%
               Semiconductors ........................         3.7%
               Aerospace .............................         3.0%
               Telecom. Equipment ....................         2.6%
               Publishing ............................         2.3%
               Computer & Bus. Equip. ................         2.1%
               Other Common Stock ....................         6.0%
               Conv. Pref. Stock .....................         5.6%
               Convertible Bonds .....................         3.5%
               Cash/Short-Term Investments ...........         6.2%

              *By market value as % of net assets on date shown. Sectors
                 subject to change due to active portfolio management.
- --------------------------------------------------------------------------------

Q. WITH THE CURRENT DIVIDEND YIELD IN THE MARKET AT A LOW, WHAT STRATEGIES DO
   YOU USE TO MAINTAIN OR INCREASE THE DIVIDEND YIELD OF THE STOCK PORTFOLIO?

A. With the current dividend yield on the market around 2%, yield is hard to
   produce. We have used financial stocks, such as Fleet Financial, with a yield
   of 3.4%, and Bank of Boston, with a yield of 2.5%. We also use real estate
   investment trusts (REITs) to boost the Portfolios yield, and this has worked
   well. REITs had some trouble in 1995, but did very well in 1996 and can
   provide good total returns over the longer term. Finally, we invest in some
   telecommunications stocks and convertible preferred stocks, which typically
   provide better-than-average dividend yields.

Q. MANY ANALYSTS EXPECT THE FAVORABLE ECONOMIC CONDITIONS OF 1996 TO CONTINUE
   INTO 1997. DO YOU AGREE?

A. Yes, but with a caveat. Investors who are new to the stock market should keep
   in mind that, although we have been in a positive economic environment for
   quite some time, the business cycle has not gone away. Eventually, we will
   see a downturn and in all likelihood a recession and the stock market could
   exhibit a considerable reaction. Many new investors in the stock market have
   never experienced a 15% or 20% correction, and they should be aware that it
   is indeed a very real possibility.

   In the short term, I am cautiously optimistic. We have a delicate balance of
   low inflation, low interest rates, and improving corporate earnings. Absent
   any external shocks, the conditions could be in place for a third straight
   year of excess returns in 1997. More likely, however, would be a year of
   returns closer to, or below, the 11% historic annual average for the U.S.
   stock market. I would also expect more volatility in the market in 1997
   because of some extended valuations and the tremendous inflow of new money.
   In my opinion, stock performance next year will be related much more directly
   to earnings results than it was this year. In this environment, a vehicle
   like the Stock Portfolio, in which the EV Marathon Stock Fund invests, makes
   sense because it balances risks and rewards by continuing to seek the most
   attractive areas and companies in the market.
<PAGE>
COMPARISON OF CHANGE IN VALUE OF A $10,000 INVESTMENT IN
EV MARATHON STOCK FUND AND THE STANDARD & POOR'S 500

From August 31, 1994, through December 31, 1996

AVERAGE ANNUAL                    1             Life            Value at
    RETURNS                     Year           of Fund*         12/31/96
- --------------------------------------------------------------------------------
With CDSC                       13.7%           16.7%            $14,238
- --------------------------------------------------------------------------------
Without CDSC                    18.7%           18.0%            $14,638
- --------------------------------------------------------------------------------

EV MARATHON STOCK FUND vs. S&P 500

    Date        Fund/NAV          Fund w/CDSC*          S&P 500
- --------------------------------------------------------------------------------
 8.31.94+       $10,000             $14,238             $10,000
 9.30.94        $ 9,743             $14,238             $ 9,754
10.31.94        $ 9,803             $14,238             $ 9,981
11.31.94        $ 9,358             $14,238             $ 9,610
12.31.94        $ 9,487             $14,238             $ 9,752
 1.31.95        $ 9,437             $14,238             $10,011
 2.28.95        $ 9,783             $14,238             $10,394
 3.31.95        $10,168             $14,238             $10,701
 4.30.95        $10,385             $14,238             $11,026
 5.31.95        $10,790             $14,238             $11,452
 6.30.95        $10,977             $14,238             $11,721
 7.31.95        $11,387             $14,238             $12,119
 8.31.95        $11,585             $14,238             $12,140
 9.30.95        $11,743             $14,238             $12,652
10.31.95        $11,649             $14,238             $12,615
11.30.95        $12,076             $14,238             $13,158
12.31.95        $12,331             $14,238             $13,413
 1.31.96        $12,548             $14,238             $13,876
 2.28.96        $12,508             $14,238             $13,997
 3.31.96        $12,618             $14,238             $14,133
 4.30.96        $12,803             $14,238             $14,350
 5.31.96        $13,147             $14,238             $14,706
 6.30.96        $13,259             $14,238             $14,767
 7.31.96        $12,641             $14,238             $14,120
 8.31.96        $13,077             $14,238             $14,414
 9.30.96        $13,604             $14,238             $15,224
10.31.96        $13,883             $14,238             $15,649
11.30.96        $14,684             $14,238             $16,825
12.31.96        $14,638             $14,238             $16,492

*FUND, ASSUMING ENTIRE INVESTMENT WAS REDEEMED ON 12/31/96 & MAX. APPLICABLE
CONTINGENT DEFERRED SALES CHARGE DEDUCTED FROM PROCEEDS

Past performance is not indicative of future results. Investment returns and
principal value will fluctuate so that an investor's shares, when redeemed, may
be worth more or less than their original cost. Source: Towers Data Systems,
Bethesda, MD. *Investment operations commenced on 8/17/94. +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 FUND'S PERFORMANCE

In accordance with guidelines issued by the Securities and Exchange Commission,
the above performance chart compares the Fund's total return with that of a
broad-based securities market index. The lines on the chart represent the total
returns of $10,000 hypothetical investments in the Fund and the S&P 500 Stock
Index.

TOTAL RETURN FIGURES

The solid line on the chart represents the Fund's performance. The Fund's total
return reflects Fund expenses, fees and Portfolio transaction costs, and assumes
the reinvestment of income dividends and capital gains distributions. The second
dollar figure listed for the Fund reflects the Funds maximum applicable
contingent deferred sales charge (CDSC), deducted at redemption as follows: 5% -
1st and 2nd years; 4% - 3rd year; 3% - 4th year; 2% - 5th year; 1% - 6th year.

The dotted line represents the performance of the S&P 500, a broad-based, widely
recognized unmanaged index of 500 common stocks. The Index's total return does
not reflect any commissions or expenses that would be incurred if an investor
purchased or sold the securities represented in the Index. It is not possible to
invest directly in the Index.
<PAGE>

                             EV MARATHON STOCK FUND
                             FINANCIAL STATEMENTS

                     STATEMENT OF ASSETS AND LIABILITIES
- ------------------------------------------------------------------------------
                              December 31, 1996
- ------------------------------------------------------------------------------
ASSETS:
  Investment in Stock Portfolio (Portfolio),
    at value (Note 1A)                                           $12,217,300
  Receivable for Fund shares sold                                      1,143
  Receivable from administrator (Note 6)                              23,100
  Deferred organization expenses (Note 1E)                            25,040
                                                                 -----------
      Total assets                                               $12,266,583

LIABILITIES:
  Dividends payable                                    $113,752
  Payable for Fund shares redeemed                        1,142
  Payable Trustees' fees -                                  142
  Accrued expenses                                        8,579
                                                       --------
      Total liabilities                                              123,615
                                                                 -----------
NET ASSETS for 873,765 shares of beneficial interest
  outstanding                                                    $12,142,968
                                                                 ===========
SOURCES OF NET ASSETS:
  Paid-in capital                                                $10,113,998
  Unrealized appreciation of investments                           1,827,001
  Accumulated net realized gain on investment
    transactions                                                     196,373
  Undistributed net investment income                                  5,596
                                                                 -----------
      Total net assets                                           $12,142,968
                                                                 ===========

NET ASSET VALUE, OFFERING AND REDEMPTION PRICE PER SHARE
  ($12,142,968 / 873,765 shares of beneficial interest
  outstanding)                                                      $13.90
                                                                    ======


     The accompanying notes are an integral part of the financial statements
<PAGE>
                           STATEMENT OF OPERATIONS
- ------------------------------------------------------------------------------
                     For the Year Ended December 31, 1996
- ------------------------------------------------------------------------------
INVESTMENT INCOME (NOTE 1B):
  Dividend income allocated from Portfolio (net of
    withholding taxes of $617)                                     $  234,507
  Interest income allocated from Portfolio                             30,343
  Expenses allocated from Portfolio                                   (72,718)
                                                                   ----------
        Total investment income                                    $  192,132

  Expenses -
    Compensation of Trustees not members of the
      Investment Adviser's organization (Note 6)      $      281
    Custodian fee                                          3,110
    Distribution and service fees (Note 4)                86,377
    Transfer and dividend disbursing agent fees            9,379
    Printing and postage                                  18,221
    Legal and accounting services                         10,785
    Registration fees                                     20,259
    Amortization of organization expenses (Note 1E)        9,150
    Miscellaneous                                          1,340
                                                      ----------
        Total expenses                                $  158,902
  Deduct -
    Allocation of expenses to the administrator
      (Note 6)                                            23,100
                                                      ----------
      Net expenses                                                    135,802
                                                                   ----------
          Net investment income                                    $   56,330

REALIZED AND UNREALIZED GAIN FROM PORTFOLIO:
  Net realized gain (identified cost basis) -
    Investment transactions                           $  627,523
    Written option transactions                           11,116
                                                      ----------
        Net realized gain on investment transactions  $  638,639
  Change in unrealized appreciation of investments     1,094,269
                                                      ----------
    Net realized and unrealized gain on investments                $1,732,908
                                                                   ----------
        Net increase in net assets resulting from operations       $1,789,238
                                                                   ==========

     The accompanying notes are an integral part of the financial statements


<PAGE>
FINANCIAL STATEMENTS (Continued)

                      STATEMENT OF CHANGES IN NET ASSETS
- ------------------------------------------------------------------------------
                                              YEAR ENDED DECEMBER 31,
                                         ---------------------------------
                                                1996               1995
                                                ----               ----
INCREASE IN NET ASSETS:
  From operations -
    Net investment income                    $    56,330       $   26,235
    Net realized gain on investment
      transactions                               638,639          118,270
    Change in unrealized appreciation
      on investments                           1,094,269          749,420
                                             -----------       ----------
      Net increase in net assets of
        investments                          $ 1,789,238       $  893,925
                                             -----------       ----------
  Distributions to shareholders -
    From net investment income               $   (57,661)      $  (19,603)
    From net realized gain on
      investments                               (444,768)        (107,649)
                                             -----------       ----------
      Total distributions to
        shareholders                         $  (502,429)      $ (127,252)
                                             -----------       ----------
  Net increase in net assets from Fund
    share transactions (Note 2)              $ 3,519,980       $5,503,696
                                             -----------       ----------
      Net increase in net assets             $ 4,806,789       $6,270,369

NET ASSETS:
  At beginning of year                       $ 7,336,179        1,065,810
                                             -----------       ----------
  At end of year (including
    undistributed net investment income
    of $5,596 and $6,408, respectively)      $12,142,968       $7,336,179
                                             ===========       ==========

     The accompanying notes are an integral part of the financial statements
<PAGE>
                              FINANCIAL HIGHLIGHTS
- ------------------------------------------------------------------------------
                                                      YEAR ENDED DECEMBER 31,
                                                      ------------------------
                                                     1996       1995     1994*
                                                     ----       ----     ----

NET ASSET VALUE - beginning of year                 $12.250   $ 9.610   $10.000
                                                    -------   -------   -------
  Income from investment operations:
    Net investment income (loss)                    $ 0.075   $ 0.060   $(0.010)
    Net realized and unrealized gain (loss) on
      investments                                     2.187     2.815    (0.380)
                                                    -------   -------   -------
      Total income (loss) from investment
        operations                                  $ 2.262   $ 2.875   $(0.390)
                                                    -------   -------   -------
  Less distributions:
    From net investment income                      $(0.080)  $(0.036)     --
    From net realized gain on investments            (0.532)   (0.199)     --
                                                    -------   -------   -------
      Total distributions                           $(0.612)  $(0.235)     --
                                                    -------   -------   -------
NET ASSET VALUE - end of year                       $13.900   $12.250   $ 9.610
                                                    =======   =======   =======
TOTAL RETURN(2)                                      18.71%    29.98% (3.90)%(3)
RATIOS/SUPPLEMENTAL DATA: (to average daily
  net assets)*** 
    Expenses(1)                                       2.09%     2.32%     3.25%+
    Net investment income (loss)                      0.57%     0.71%   (0.74)%+

NET ASSETS AT END OF YEAR (000'S OMITTED)           $12,143   $ 7,336   $ 1,066

Note: Certain per share amounts have been calculated using average shares
outstanding during the period ended 12/31/94.

   + Computed on an annualized basis.
   * For the period from the start of business, August 17, 1994, to December 31,
     1994.
 (1) Includes the Fund's share of Stock Portfolio's allocated expenses.
 (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 of the last day of each
     period reported. Dividends and distributions, if any, are assumed to be
     reinvested at the net asset value on the record date.
 (3) Total return is not computed on an annualized basis.
 *** The expenses related to the operation of the Fund reflect an allocation of
     expenses to the administrator. Had such action not been taken, net
     investment income (loss) per share and the ratios would have been as
     follows:

     NET INVESTMENT INCOME (LOSS) PER SHARE         $ 0.018   $(0.022) $ (0.016)
       RATIOS (to average daily net assets):
         Expenses                                     2.33%      3.66%    3.81%+
         Net investment income (loss)                 0.33%     (0.63%) (0.18%)+

    The accompanying notes are an integral part of the financial statements
<PAGE>
                         NOTES TO FINANCIAL STATEMENTS
                               DECEMBER 31, 1996
- --------------------------------------------------------------------------------
(1) SIGNIFICANT ACCOUNTING POLICIES
EV Marathon Stock Fund (the Fund), a Massachusetts business trust, is registered
under the Investment Company Act of 1940, as amended, as a diversified,
open-end, management investment company. The Fund is a series in the Eaton Vance
Special Investment Trust. The Fund invests all of its investable assets in
interests in the Stock 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 (9.9% at December 31, 1996). 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.

C. EXPENSE REDUCTION -- The Fund has entered into an arrangement with its
custodian whereby interest earned on uninvested cash balances are used to offset
custody fees. All significant reductions are reported as a reduction of expenses
in the Statement of Operations.

D. 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, option and financial futures transactions.
Accordingly, no provision for federal income or excise tax is necessary.
Pursuant to Section 852 of the Internal Revenue Code, the Fund designates
$477,791 as capital gain dividends for its taxable year ended December 31, 1996.

E. DEFERRED ORGANIZATION EXPENSES -- Costs incurred by the Fund in connection
with its organization, are being amortized on the straight-line basis over
five years.

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

G. DISTRIBUTIONS -- Generally accepted accounting principles require that
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, with no impact to the net asset value of the
Fund.

H. 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.

- ------------------------------------------------------------------------------
(2) SHARES OF BENEFICIAL INTEREST
The Declaration of Trust permits the Trustees to issue an unlimited number of
full and fractional shares of beneficial interest (with no par value).
Transactions in Fund shares were as follows:

<TABLE>
<CAPTION>
                                                    YEAR ENDED              YEAR ENDED
                                                DECEMBER 31, 1996       DECEMBER 31, 1995
                                               --------------------    --------------------
                                                SHARES      AMOUNT      SHARES      AMOUNT
                                              ---------  -----------  ---------  -----------
<S>                                            <C>       <C>           <C>       <C>       
Sales                                          502,161   $6,401,841    681,373   $7,710,688
Issued to shareholders electing to 
  receive payment of distribution in
  Fund shares                                   28,362      378,659      9,235      111,558
Redemptions                                   (255,733)  (3,260,520)  (202,565)  (2,318,550)
                                               -------   ----------    -------   ----------
    Net increase                               274,790   $3,519,980    488,043   $5,503,696
                                               =======   ==========    =======   ==========
</TABLE>

- ------------------------------------------------------------------------------
(3) INVESTMENT TRANSACTIONS
Increases and decreases in the Fund's investment in the Portfolio aggregated
$6,481,805 and $3,434,210, respectively.
- ------------------------------------------------------------------------------
(4) DISTRIBUTION PLAN
The Fund has adopted a Distribution Plan (the Plan) pursuant to Rule 12b-1 under
the Investment Company Act of 1940. The Plan requires the Fund to pay the
principal underwriter, Eaton Vance Distributors, Inc. (EVD), amounts equal to
1/365th of 0.75% of the Fund's daily net assets, 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% of the
aggregate amount received by the Fund for shares sold plus, (ii) distribution
fees calculated by applying the rate of 1% over the prevailing prime rate to the
outstanding balance of Uncovered Distribution Charges of EVD, reduced by the
aggregate amount of contingent deferred sales charges (see Note 5) and amounts
theretofore paid 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. Such
payments would cease upon termination of the distribution agreement (unless
made in accordance with another distribution agreement). As a result, the Fund
does not accrue amounts which may become payable to EVD in the future because
the conditions for recording any contingent liability under generally accepted
accounting principles have not been satisfied. EVD earned $74,601 for the year
ended December 31, 1996 representing 0.75% of average daily net assets. At
December 31, 1996, the amount of Uncovered Distribution Charges of EVD
calculated under the Plan was approximately $320,716.

  In addition, the Plan authorizes the Fund to make payments of service fees
to the Principal Underwriter, Authorized Firms and other persons in amounts
not exceeding 0.25% of the Fund's average daily net assets for each fiscal
year. The Trustees of the Fund have implemented the Plan by authorizing the
Fund to make quarterly payments of service fees to the Principal Underwriter
and Authorized Firms in amounts not expected to exceed 0.25% of the Fund's
average daily net assets for each fiscal year based on the value of Fund
shares sold by such persons and remaining outstanding for at least twelve
months. During the year ended December 31, 1996, the Fund provided for $11,776
under the Plan to the Principal Underwriter and Authorized Firms. 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 where there are no outstanding Uncovered Distribution Charges
of EVD.

  Certain of the officers of the Fund and Directors of the Corporation are
officers and directors of EVD.

- ------------------------------------------------------------------------------
(5) CONTINGENT DEFERRED SALES CHARGE (CDSC)
A contingent deferred sales charge (CDSC) is imposed on any redemption of Fund
shares made within six years of purchase. 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 gain
distributions. The CDSC is imposed at declining rates that begin at 5% in the
first and second year of redemption after purchase, declining one percentage
point each 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 the
Fund's Distribution Plan. CDSC charges received when no Uncovered Distribution
charges exist will be retained by the Fund. EVD received approximately $33,808
of CDSC paid by shareholders for the year ended December 31, 1996.

- ------------------------------------------------------------------------------
(6) INVESTMENT ADVISER FEE AND OTHER TRANSACTIONS WITH AFFILIATES
Eaton Vance serves only as the administrator of the Fund, but receives no
compensation. The administrator assumed $23,100 of the Funds' expenses for the
year ended December 31, 1996. The Portfolio has engaged Boston Management and
Research (BMR), a subsidiary of Eaton Vance Management (EVM), to render
investment advisory services. See Note 3 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 organization,
officers and Trustees receive remuneration for their services to the Fund out of
such investment adviser fee.

  Certain of the officers and Trustees of the Fund and Portfolio are officers
and trustees of the above organizations.
<PAGE>
                      REPORT OF INDEPENDENT ACCOUNTANTS
- ------------------------------------------------------------------------------
TO THE SHAREHOLDERS AND BOARD OF TRUSTEES OF
EV MARATHON STOCK FUND:

We have audited the accompanying statement of assets and liabilities of EV
Marathon Stock Fund, a series of Eaton Vance Special Investment Trust, as of
December 31, 1996, the related statements of operations for the year then ended,
the changes in net assets for each of the two years then ended and the financial
highlights for each of the two years then ended and for the period from August
17, 1994 (start of business) to December 31, 1994. These financial statements
and financial highlights are the responsibility of the Fund's management. Our
responsibility is to express an opinion on these financial statements and
financial highlights based on our audits.

We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audits to obtain
reasonable assurance about whether the financial statements and financial
highlights are free of material misstatement. An audit includes examining, on a
test basis, evidence supporting the amounts and disclosures in the financial
statements. Our procedures included confirmation of securities owned as of
December 31, 1996 by correspondence with the custodian. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements and financial highlights referred to
above present fairly, in all material respects, the financial position of EV
Marathon Stock Fund, a series of Eaton Vance Special Investment Trust, as of
December 31, 1996, the results of its operations for the year then ended, and
the changes in its net assets for each of the two years then ended and the
financial highlights for each of the two years then ended and for the period
from August 17, 1994 (start of business) to December 31, 1994, in conformity
with generally accepted accounting principles.

                                              COOPERS & LYBRAND L.L.P.

BOSTON, MASSACHUSETTS
JANUARY 31, 1997
<PAGE>
                     -----------------------------------
                                 STOCK PORTFOLIO
                            PORTFOLIO OF INVESTMENTS
                                DECEMBER 31, 1996
- ----------------------------------------------------------------------------
                                 COMMON STOCKS -- 84.7%
- ----------------------------------------------------------------------------
SHARES       SECURITY                                            VALUE
- ----------------------------------------------------------------------------
             AEROSPACE - 3.0%
 35,000      Boeing Co.                                         $  3,723,125
                                                                ------------
             BANKS - 5.2%
 30,000      Bank of Boston Corp.                               $  1,927,500
 30,332      Citicorp                                              3,124,196
 26,766      Fleet Financial Group, Inc.                           1,334,954
                                                                ------------
                                                                $  6,386,650
                                                                ------------
             BASIC MATERIALS - 0.8%
 80,000      J & L Specialty Steel, Inc.                        $    910,000
                                                                ------------
             BROADCASTING - 0.4%
 25,000      Comcast Corp., Class A                             $    445,313
                                                                ------------
             BUSINESS PRODUCTS & SERVICES - 9.2%
 65,000      Automatic Data Procesing, Inc.                     $  2,786,875
 40,000      Corning, Inc.                                         1,850,000
 60,000      Crown Cork & Seal, Inc.                               3,262,500
 20,000      Electronic Data Systems Corp.                           865,000
 30,000      Potash Corp.                                          2,550,000
                                                                ------------
                                                                $ 11,314,375
                                                                ------------
             COMPUTER & BUSINESS EQUIPMENT - 2.1%
 50,000      Xerox Corp.                                        $  2,631,250
                                                                ------------
             CONSUMER NON-DURABLES - 12.0%
 76,063      Conagra, Inc.                                      $  3,784,134
 35,000      Duracell International, Inc.                          2,445,625
 65,000      Eastman Kodak Co.                                     5,216,250
 70,000      Pepsico, Inc.                                         2,047,500
 12,100      Procter & Gamble Co.                                  1,300,750
                                                                ------------
                                                                $ 14,794,259
                                                                ------------
             ENERGY - 4.3%
 10,000      Exxon Corp.                                        $    980,000
 40,000      Occidental Petroleum Corp.                              935,000
 70,000      Triton Energy Ltd.*                                   3,395,000
                                                                ------------
                                                                $  5,310,000
                                                                ------------
             FINANCE & INSURANCE - 12.5%
 60,540      Allstate Corp.                                     $  3,503,753
 25,000      American International Group                          2,706,250
 75,000      Federal National Mortgage Association                 2,793,750
 20,000      Marsh & McLennan Cos., Inc.                           2,080,000
 30,000      MGIC Investment Corp.                                 2,280,000
 30,000      Progressive Corp.                                     2,021,250
                                                                ------------
                                                                $ 15,385,003
                                                                ------------
             HEALTHCARE - 10.4%
 25,000      Astra AB, A Shares, ADR                            $  1,225,000
 30,000      Astra AB, B Shares, ADR                               1,445,511
 55,000      Baxter International, Inc.                            2,255,000
 30,000      Johnson & Johnson Co.                                 1,492,500
 20,000      Lilly (Eli) & Co.                                     1,460,000
 10,000      Pfizer, Inc.                                            828,750
 30,000      Pharmacia & Upjohn, Inc.                              1,188,750
 90,000      Vencor, Inc.*                                         2,846,250
                                                                ------------
                                                                $ 12,741,761
                                                                ------------
             HOUSING - 1.5%
 60,000      Newell Co.                                         $  1,890,000
                                                                ------------
             LODGING & GAMING - 1.7%
 70,000      Promus Hotel Corp.*                                $  2,073,750
                                                                ------------
             PAPER & FOREST PRODUCTS - 1.6%
 50,000      Rayonier, Inc.                                     $  1,918,750
                                                                ------------
             PUBLISHING - 2.3%
 60,000      McGraw-Hill, Inc.                                  $  2,767,500
                                                                ------------
             REITS - 6.8%
 30,000      Beacon Properties Corp.                            $  1,098,750
 11,000      Cali Realty Corp.                                       339,625
 20,000      Equity Residential Properties Trust                     825,000
 25,000      Highwood Properties, Inc.                               843,750
 40,000      Nationwide Health Properties, Inc.                      970,000
 20,000      Post Properties, Inc.                                   805,000
 18,000      Redwood Trust, Inc.                                     670,500
 25,000      ROC Communities, Inc.                                   693,750
 20,000      Storage USA, Inc.                                       752,500
 25,000      Sun Communities, Inc.                                   862,500
 14,200      Trinet Corporate Realty Trust, Inc.                     504,100
                                                                ------------
                                                                $  8,365,475
                                                                ------------
             RETAIL - 4.6%
 65,000      CVS Corp.                                          $  2,689,375
 60,000      The Home Depot, Inc.                                  3,007,500
                                                                ------------
                                                                $  5,696,875
                                                                ------------
             SEMICONDUCTORS - 3.7%
 35,000      Intel Corp.                                        $  4,582,812
                                                                ------------
             TELECOMMUNICATIONS EQUIPMENT - 2.6%
 55,000      Nokia Corp., ADR                                   $  3,169,375
                                                                ------------
             TOTAL COMMON STOCKS
               (IDENTIFIED COST, $79,726,807)                   $104,106,273
                                                                ------------

- ----------------------------------------------------------------------------
                           CONVERTIBLE PREFERRED STOCKS - 5.6%
- ----------------------------------------------------------------------------
140,000      Freeport McMoRan Copper & Gold, 5s                 $  3,885,000
 15,000      Frontier Financing Trust, 6.25s*                        768,750
 10,000      Tejas Gas Corp., 5.25s                                  597,500
 10,000      Valero Energy Corp., 6.25s                              577,500
 25,000      Sun America, Inc., 3.188s                             1,056,250
                                                                ------------
             TOTAL CONVERTIBLE PREFERRED STOCKS
               (IDENTIFIED COST, $5,716,186)                    $  6,885,000
                                                                ------------

- ----------------------------------------------------------------------------
                                CONVERTIBLE BONDS - 3.5%
- ----------------------------------------------------------------------------
FACE AMOUNT
(000'S OMITTED)
- ----------------------------------------------------------------------------
 $2,920      INCO Ltd., 5.75s, 7/1/04                           $  3,533,200
    840      Scandinavian Broadcasting System,
             7.25s, 8/1/05                                           789,600
                                                                ------------
             TOTAL CONVERTIBLE BONDS
               (IDENTIFIED COST, $4,055,000)                    $  4,322,800
                                                                ------------

- ----------------------------------------------------------------------------
                                  CORPORATE BOND - 0.0%
- ----------------------------------------------------------------------------
 $   50      H. P. Hood & Son, 7.50s, 2/1/01                    $     39,400
                                                                ------------
             TOTAL CORPORATE BOND
               (IDENTIFIED COST, $50,000)                       $     39,400
                                                                ------------

- ----------------------------------------------------------------------------
                              SHORT TERM INVESTMENTS - 5.7%
- ----------------------------------------------------------------------------
FACE AMOUNT
(000'S OMITTED)   SECURITY                                      VALUE
- ----------------------------------------------------------------------------
 $3,951      Associates Corp. of North America,
             6.5s, 1/2/97                                       $  3,950,287
  3,023      General Electric Capital Co., 6s, 1/2/97              3,022,496
                                                                ------------
             TOTAL SHORT TERM INVESTMENTS
               AT AMORTIZED COST                                $  6,972,783
                                                                ------------
             TOTAL INVESTMENTS - 99.5%
               (IDENTIFIED COST, $96,520,776)                   $122,326,256
             OTHER ASSETS, LESS LIABILITIES - 0.5%                   636,892
                                                                ------------
             NET ASSETS - 100%                                  $122,963,148
                                                                ============
*Non-income producing security.
REIT -- Real Estate Investment Trust
ADR -- American Depository Receipt


    The accompanying notes are an integral part of the financial statements
<PAGE>
<TABLE>
<CAPTION>
                                      -----------------------------------
                                                STOCK PORTFOLIO
                                              FINANCIAL STATEMENTS

                                      STATEMENT OF ASSETS AND LIABILITIES
- --------------------------------------------------------------------------------------------------------------
                                               December 31, 1996
- --------------------------------------------------------------------------------------------------------------
<S>                                                                                 <C>           <C>         
ASSETS:
  Investments, at value (Note 1A) (identified cost, $96,520,776)                                  $122,326,256
  Cash                                                                                                   1,519
  Receivable for investments sold                                                                      641,278
  Interest receivable                                                                                  110,888
  Dividends receivable                                                                                 231,896
  Deferred organization expenses (Note 1D)                                                               8,461
  Tax reclaim receivable                                                                                21,656
                                                                                                  ------------
      Total assets                                                                                $123,341,954
LIABILITIES:
  Payable for investments purchased                                                 $120,500
  Written options, at value (premium received $61,335)                               243,125
  Payable to affiliate --
    Trustees fees                                                                      2,065
  Accrued expenses                                                                    13,116
                                                                                    --------
      Total liabilities                                                                                378,806
                                                                                                  ------------
NET ASSETS applicable to investors' interest in Portfolio                                         $122,963,148
                                                                                                  ============
SOURCES OF NET ASSETS:
  Net proceeds from capital contributions and withdrawals                                         $ 97,339,457
  Unrealized appreciation of investments and written options
    (computed on the basis of identified cost)                                                      25,623,691
                                                                                                  ------------
      Total net assets                                                                            $122,963,148
                                                                                                  ============
</TABLE>


    The accompanying notes are an integral part of the financial statements
<PAGE>
<TABLE>
<CAPTION>

                                            STATEMENT OF OPERATIONS
- --------------------------------------------------------------------------------------------------------------
                                      For the Year Ended December 31, 1996
- --------------------------------------------------------------------------------------------------------------
<S>                                                                             <C>               <C>        
INVESTMENT INCOME:
    Interest                                                                                      $   346,215
    Dividends (net of withholding tax of $8,319)                                                    2,692,262
                                                                                                  -----------
      Total income                                                                                  3,038,477
  Expenses --
    Investment adviser fee (Note 3)                                             $   706,803
    Compensation of Trustees, not members of the Investment Adviser's
      organization (Note 3)                                                           9,090
    Custodian fee                                                                    79,008
    Legal and accounting services                                                    28,096
    Amortization of organizational expenses (Note 1D)                                 3,258
                                                                                -----------
        Total expenses                                                                            $   826,255
                                                                                                  -----------
          Net investment income                                                                     2,212,222

REALIZED AND UNREALIZED GAIN ON INVESTMENTS:
  Net realized gain (identified cost basis) --
    Investment transactions                                                     $14,593,864
    Written option transactions                                                     122,298
                                                                                -----------
      Net realized gain on investment transactions                                                $14,716,162
  Change in unrealized appreciation of investments and written options                              4,346,638
                                                                                                  -----------
        Net realized and unrealized gain on investments                                           $19,062,800
                                                                                                  -----------
          Net increase in net assets resulting from operations                                    $21,275,022
                                                                                                  ===========
</TABLE>


    The accompanying notes are an integral part of the financial statements
<PAGE>
FINANCIAL STATEMENTS (Continued)

<TABLE>
<CAPTION>
                                       STATEMENT OF CHANGES IN NET ASSETS
- --------------------------------------------------------------------------------------------------------------
                                                                                   YEAR ENDED DECEMBER 31,
                                                                               -------------------------------
                                                                                 1996               1995
                                                                               ------------       ------------
<S>                                                                            <C>                <C>         
INCREASE (DECREASE) IN NET ASSETS:
  From operations --
    Net investment income                                                      $  2,212,222       $  2,228,398
    Net realized gain on investment transactions                                 14,716,162         10,222,803
    Change in unrealized appreciation of investments                              4,346,638         14,953,494
                                                                               ------------       ------------
      Net increase in net assets resulting from operations                     $ 21,275,022       $ 27,404,695
                                                                               ------------       ------------
  Capital transactions --
    Contributions                                                              $  9,663,514       $ 13,753,042
    Withdrawals                                                                 (15,692,663)       (18,959,497)
                                                                               ------------       ------------
      Net decrease in net assets resulting from capital transactions           $ (6,029,149)      $ (5,206,455)
                                                                               ------------       ------------
        Net increase in net assets                                             $ 15,245,873       $ 22,198,240
NET ASSETS:
  At beginning of year                                                          107,717,275         85,519,035
                                                                               ------------       ------------
  At end of year                                                               $122,963,148       $107,717,275
                                                                               ============       ============

<CAPTION>
- --------------------------------------------------------------------------------------------------------------
                              SUPPLEMENTARY DATA
- --------------------------------------------------------------------------------------------------------------

                                                                         YEAR ENDED DECEMBER 31,
                                                           ---------------------------------------------------
                                                                1996               1995              1994*
                                                           ------------        ------------       ------------
<S>                                                           <C>                 <C>              <C>   
RATIOS (to average daily net assets):
  Expenses                                                      0.73%             0.75%            0.73%+
  Net investment income                                         1.96%             2.30%            2.45%+
PORTFOLIO TURNOVER                                               114%              108%              28%
AVERAGE COMMISSION RATE PAID(1)                               $0.0579               --               --

  +Computed on an annualized basis.
  *For the period from the start of business, August 1, 1994, to December 31, 1994.
(1)For fiscal year beginning on or after September 1, 1995, a fund is required to disclose its average commission
   rate per share for security trades on which commissions are charged. Average commissions rate paid is computed
   by dividing the total dollar amount of commissions paid during the fiscal year by the total number of shares
   purchased and sold during the fiscal year for which commissions were charged.
</TABLE>



    The accompanying notes are an integral part of the financial statements
<PAGE>
                     -----------------------------------
                         NOTES TO FINANCIAL STATEMENTS
                               DECEMBER 31, 1996

- --------------------------------------------------------------------------------
(1) SIGNIFICANT ACCOUNTING POLICIES
Stock Portfolio (the Portfolio) is registered under the Investment Company Act
of 1940 as a diversified open-end investment company which was organized as a
trust under the laws of the State of New York on May 1, 1992. The Declaration of
Trust permits the Trustees to issue beneficial 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. SECURITY VALUATIONS -- Investments in securities traded on a national
securities exchange or in the NASDAQ National Market are valued on the basis of
the last reported sales prices on the last business day of the period. If no
sale is reported on that date, a security is valued, if quoted on such a day, at
not lower than the old bid price nor higher than the asked prices. Prices on
such exchanges will not be used for valuing debt securities if in the Trustees
judgment, some other valuation method more accurately reflects the fair market
value of such a security. Securities for which over-the-counter market
quotations are readily available are valued on the basis of the mean between the
last bid and asked prices. Short-term securities are valued at amortized cost,
which approximates market value. All other securities and assets are appraised
to reflect their fair value as determined in good faith by the Trustees.

B. INCOME TAXES -- The Portfolio is treated as a partnership for 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 investors'
distributive share of the Portfolio's net investment income, net realized
capital gains, and any other items of income, gain, loss, deduction or credit.

C. EXPENSE REDUCTION -- The Portfolio has entered into an arrangement with its
custodian agent whereby interest earned on uninvested cash balances are used to
offset custody fees. All significant reductions are reported as a reduction of
expenses in the Statement of Operations.

D. DEFERRED ORGANIZATION EXPENSES -- Costs incurred by the Portfolio in
connection with its organization are being amortized on the straight-line basis
over five years.

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

F. WRITTEN OPTIONS -- The Portfolio may write call or put options for which
premiums are received and are recorded as liabilities, and are subsequently
adjusted to the current value of the options written. Premiums received from
writing options which expire are treated as realized gains. Premiums received
from writing options which are exercised or are closed are offset against the
proceeds or amount paid on the transaction to determine the realized gain or
loss. If a put option is exercised, the premium reduces the cost basis of the
securities purchased by the Portfolio. The Portfolio as a writer of an option
may have no control over whether the underlying securities may be sold (call) or
purchased (put) and as a result bears the market risk of an unfavorable change
in the price of the securities underlying the written option.

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 expenses during the reporting period. Actual results could differ
from those estimates.

- --------------------------------------------------------------------------------
(2) INVESTMENT TRANSACTIONS
Purchases and sales of investments, other than short-term obligations,
aggregated $124,512,639 and $131,656,035, respectively.

- --------------------------------------------------------------------------------
(3) 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 at the annual rate of 5/8 of 1% of average daily net assets. For the year
ended December 31, 1996, the fee amounted to $706,803. 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 services to the Portfolio out of such
investment adviser fee. Certain of the officers and Trustees of the Portfolio
are officers and 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 percentage of their annual fees in accordance with the terms of the
Trustees Deferred Compensation Plan. For the year ended December 31, 1996, no
significant amounts have been deferred.

- --------------------------------------------------------------------------------
(4) LINE OF CREDIT
The Portfolio participates with other portfolios and funds managed by BMR and
EVM and its affiliates in a committed $120 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 banks, adjusted certificate of deposit rate, eurodollar rate or
federal funds rate. In addition, a fee computed at an annual rate of 0.15% 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 year ended
December 31, 1996.

- --------------------------------------------------------------------------------
(5) FEDERAL INCOME TAX BASIS OF INVESTMENTS
The cost and unrealized appreciation/depreciation in value of the investments
owned at December 31, 1996, as computed on a federal income tax basis, were as
follows:

    Aggregate cost                                               $96,450,080
                                                                 ===========
    Gross unrealized appreciation                                $26,380,933
    Gross unrealized depreciation                                    504,757
                                                                 -----------
      Net unrealized appreciation                                $25,876,176
                                                                 ===========

- --------------------------------------------------------------------------------
(6) FINANCIAL INSTRUMENTS
The Portfolio regularly trades in financial instruments with off-balance-sheet
risk in the normal course of its investing activities and to assist in managing
exposure to market risks such as interest rates and foreign currency exchange
rates. These financial instruments include written options. The notional or
contractual amounts of these instruments represent the investment the Portfolio
has in particular classes of financial instruments and do not necessarily
represent the amounts potentially subject to risk. The measurement of the risks
associated with these instruments is meaningful only when all related and
offsetting transactions are considered. A summary of obligations under these
financial instruments at December 31, 1996 is as follows:

Written Option Transactions
Transactions in written options for the year ended December 31, 1996 were as
follows:

                                             NUMBER
                                          OF CONTRACTS
                                         (000'S OMITTED)        PREMIUMS
                                         ---------------        --------

Outstanding, beginning of year                 --                  --
  Options written                              500              $184,960
  Options exercised                           (300)              (32,750)
  Options expired                             (100)              (90,875)
                                               ---              --------
Outstanding, end of year                       100              $ 61,335
                                               ===              ========
<PAGE>
                      REPORT OF INDEPENDENT ACCOUNTANTS
- --------------------------------------------------------------------------------
TO THE BOARD OF TRUSTEES AND INVESTORS OF
STOCK PORTFOLIO:


We have audited the accompanying statement of assets and liabilities of Stock
Portfolio, including the portfolio of investments, as of December 31, 1996, the
related statement of operations for the year then ended, the statement of
changes in net assets for each of the two years then ended and the supplementary
data for each of the two years then ended and for the period from August 1, 1994
(start of business) to December 31, 1994. These financial statements and
supplementary data are the responsibility of the Portfolio's management. Our
responsibility is to express an opinion on these financial statements and
supplementary data based on our audits.

We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audits to obtain
reasonable assurance about whether the financial statements and supplementary
data are free of material misstatement. An audit includes examining, on a test
basis, evidence supporting the amounts and disclosures in the financial
statements. Our procedures included confirmation of securities owned as of
December 31, 1996 by correspondence with the custodian and brokers. An audit
also includes assessing the accounting principles used and significant estimates
made by management, as well as evaluating the overall financial statement
presentation. We believe that our audits provide a reasonable basis for our
opinion.

In our opinion, the financial statements and supplementary data referred to
above present fairly, in all material respects, the financial position of Stock
Portfolio, as of December 31, 1996, the results of its operations for the year
then ended, the changes in its net assets for each of the two years then ended
and the supplementary data for each of the two years then ended and for the
period from August 1, 1994 (start of business) to December 31, 1994, in
conformity with generally accepted accounting principles.



                                              COOPERS & LYBRAND L.L.P.

BOSTON, MASSACHUSETTS
JANUARY 31, 1997


<PAGE>
                     -----------------------------------
                            INVESTMENT MANAGEMENT

EV MARATHON       OFFICERS               TRUSTEES
STOCK FUND
24 Federal Street JAMES B. HAWKES        M. DOZIER GARDNER
Boston, MA 02110  President, Trustee     Vice Chairman, Eaton Vance 
                                         Management
                  CLIFFORD H. KRAUSS
                  Vice President         DONALD R. DWIGHT
                                         President, Dwight Partners, Inc.
                  EDWARD E. SMILEY, JR.  Chairman, Newspapers of
                  Vice President         New England, Inc.
                                         
                  JAMES L. O'CONNOR      SAMUEL L. HAYES, III          
                  Treasurer              Jacob H. Schiff Professor of  
                                         Investment Banking, Harvard   
                  THOMAS OTIS            University Graduate School of 
                  Secretary              Business Administration       
                                                                       
                                         NORTON H. REAMER              
                                         President, United Asset       
                                         Management Corporation        
                                                                       
                                         JOHN L. THORNDIKE             
                                         Director, Fiduciary Company   
                                         Incorporated                  
                                                                       
                                         JACK L. TREYNOR               
                                         Investment Adviser and        
                                         Consultant                    
                                         
                  ------------------------------------------------------
STOCK PORTFOLIO   OFFICERS               TRUSTEES                         
24 Federal Street                                                         
Boston, MA 02110  JAMES B. HAWKES        DONALD R. DWIGHT                 
                  President, Trustee     President, Dwight  Partners, Inc.
                                         Chairman, Newspapers of          
                  DUNCAN W. RICHARDSON   New England, Inc.                
                  Vice President and                                      
                  Portfolio Manager      SAMUEL L. HAYES, III             
                                         Jacob H. Schiff Professor of     
                  JAMES L. O'CONNOR      Investment Banking, Harvard      
                  Treasurer              University Graduate School of    
                                         Business Administration          
                  THOMAS OTIS                                             
                  Secretary              NORTON H. REAMER                 
                                         President, United Asset          
                                         Management Corporation           
                                                                          
                                         JOHN L. THORNDIKE                
                                         Director, Fiduciary              
                                         Company Incorporated             
                                                                          
                                         JACK L. TREYNOR                  
                                         Investment Adviser and           
                                         Consultant                       



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