EATON VANCE SPECIAL INVESTMENT TRUST
N-30D, 1998-08-26
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<PAGE>

[LOGO OF EATON VANCE 
 MUTUAL FUNDS APPEARS HERE]                         [PHOTO APPEARS HERE]
    

                         
        Semiannual Report June 30, 1998


                            EATON VANCE 
[PHOTO APPEARS HERE]
                             BALANCED 

                               FUND




                    Global Management--Global Distribution

[PHOTO APPEARS HERE]


<PAGE>

Eaton Vance Balanced Fund as of June 30, 1998

INVESTMENT UPDATE

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

Thomas E. Faust Jr.
Portfolio Manager

Investment Environment
- --------------------------------------------------------------------------------
  The Economy

 . In the first half of 1998, the U.S. economy continued to benefit from a
  confluence of favorable trends, including sound growth, historically low
  unemployment, and tame inflation.

 . Gross Domestic Product increased by a stronger-than-expected 5.4% in the first
  quarter, but slowed to a 1.4% rate in the second quarter. Meanwhile, the
  unemployment rate declined from 4.7% in December, 1997, to 4.5% in June, 1998.
  The Consumer Price Index rose just 1.6% in the twelve months ended June, 1998.

 . Investors continue to evaluate the potential effect of the Asian economic
  crisis on the U.S. economy. Thus far in 1998, lower prices for Asian imports
  have led to lower prices for imported manufactured goods overall, contributing
  to already-low inflation.

  The Stock Market

 . The U.S. stock market surged to record levels in the first six months of the
  year, with the S&P 500 Index registering a total return of 17.7%.* The Index's
  strength reflected the favorable economic backdrop, a good earnings outlook,
  and a continuing flight to quality by global investors.

 . The market was characterized by increasing volatility during the period. In
  the six weeks from early May through mid-June, the market underwent a 6%
  correction as high valuations and fears of lackluster second-quarter earnings
  sent the market lower. Investor confidence was restored by month-end, however,
  with blue chips again providing market leadership.

 . The low inflation outlook led to declining interest rates and positive returns
  for the bond market. The yield on the 30-year Treasury bond fell from 5.92% at
  December 31, 1997, to 5.63% at June 30, 1998. The Lehman Government/Corporate
  Bond Index had a total return of 4.2% during the period.*

The Fund
- --------------------------------------------------------------------------------
  The Past Six Months

 . During the six months ended June 30, 1998, the Fund's Class A shares had a
  total return of 10.5%. This return resulted from an increase in net asset
  value (NAV) to $9.51 per share on June 30, 1998 from $8.70 on December 31,
  1997, and the reinvestment of $0.10 in dividends and $0.0035 in capital gain
  distributions./1/

 . The Fund's Class B shares had a total return of 10.1% during the period, the
  result of an increase in NAV to $14.95 per share from $13.68 per share, and
  the reinvestment of $0.10 in dividends and $0.0035 in capital gain
  distributions./1/

 . The Fund's Class C shares had a total return of 10.1% during the period, the
  result of an increase in NAV to $14.47 per share from $13.24 per share, and
  the reinvestment of $0.10 in dividends and $0.0035 in capital gain
  distributions./1/

 . By comparison, the average total return for mutual funds in the Lipper
  Balanced Funds Category was 9.0% during this period./2/ 

  Portfolio Strategy

 . The Portfolio maintained a strong exposure to equities - 66% of the
  Portfolio's net assets at June 30. Insurance and drug stocks represented the
  Portfolio's largest weightings. Warner-Lambert Co., the Portfolio's largest
  holding, rose 67.8% during the period. The company's Lipitor drug has recorded
  rapid sales growth due to higher efficacy rates than its competitors in the
  cholesterol-lowering field. In the insurance sector, General Re Corp. was up
  19.6%. The leader in re-insurance agreed to be acquired by Berkshire Hathaway,
  Inc.

 . Another major holding, Home Depot, was up 41.1% in the first half as a
  beneficiary of lower interest rates and a surge in home remodellings. CVS
  Corp., up 21.6%, is a fast-growing pharmacy chain operating more than 4,000
  stores in 25 states. The company has enjoyed rapid same store sales in the
  past year, as well as the benefits of an aggressive acquisition strategy.

 . Amid declining interest rates, the Portfolio's fixed-income segment performed
  well. Corporate put bonds provided a wide exposure to the U.S. economy,
  including financial, industrial and consumer goods companies.
- --------------------------------------------------------------------------------
Fund Information
as of June 30, 1998


Performance/2/                                       Class A  Class B  Class C
- --------------------------------------------------------------------------------

Average Annual Total Returns (at net asset value)
- --------------------------------------------------------------------------------
One Year                                               19.2%    18.1%   17.7%
Five Years                                             15.6      N.A.    N.A.
Ten Years                                              13.3      N.A.    N.A.
Life of Fund+                                          10.3     14.2    13.6

SEC Average Annual Total Returns (including sales charge or applicable CDSC)
- --------------------------------------------------------------------------------
One Year                                               12.4%    13.1%   16.7%
Five Years                                             14.2      N.A.    N.A.
Ten Years                                              12.7      N.A.    N.A.
Life of Fund+                                          10.2     14.0    13.6


+Inception Dates - Class A: 4/1/32; Class B: 11/2/93; Class C:11/2/93


Ten Largest Equity Holdings/3/
- --------------------------------------------------------------------------------

By total net assets

Warner-Lambert Co.           2.6%
Sofamor-Danek Group, Inc.    2.4
Home Depot, Inc. (The)       2.3
General Re Corp.             2.1
CVS Corp.                    2.1
Unilever ADR                 2.0
Mutual Risk Management Ltd.  1.9
Norwest Corp.                1.9
SunAmerica, Inc.             1.8
Allstate Corp., (The)        1.5

- --------------------------------------------------------------------------------
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.
- --------------------------------------------------------------------------------

/1/This return does not include the maximum 5.75% sales charge for Class A
shares or the applicable contingent deferred sales charges (CDSC) for Class B
and C shares. /2/ 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. /3/ As of 6/30/98; may not be
representative of the Portfolio's current or future investments. The ten largest
holdings accounted for 20.6% of the Portfolio's investments. *It is not possible
to invest directly in an Index or Lipper Category.

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.



                                       2


<PAGE>

Eaton Vance Balanced Fund as of June 30, 1998

FINANCIAL STATEMENTS (Unaudited)

Statement of Assets and Liabilities     


As of June 30, 1998
Assets
- --------------------------------------------------------------------------------
Investment in Balanced Portfolio, at value
    (identified cost, $265,043,448)                                $359,292,977
Receivable for Fund shares sold                                         255,641
Deferred organization expenses                                            8,276
- --------------------------------------------------------------------------------
Total assets                                                       $359,556,894
- --------------------------------------------------------------------------------


Liabilities
- --------------------------------------------------------------------------------
Payable for Fund shares redeemed                                   $    570,679
Payable to affiliate for Trustees' fees                                   1,900
Other accrued expenses                                                  203,408
- --------------------------------------------------------------------------------
Total liabilities                                                  $    775,987
- --------------------------------------------------------------------------------
Net Assets                                                         $358,780,907
- --------------------------------------------------------------------------------


Sources of Net Assets
- --------------------------------------------------------------------------------
Paid-in capital                                                    $233,980,909
Accumulated undistributed net realized gain from Portfolio 
    (computed on the basis of identified cost)                       29,774,117
Accumulated undistributed net investment income                         776,352
Net unrealized appreciation from Portfolio (computed on the 
    basis of identified cost)                                        94,249,529
- --------------------------------------------------------------------------------
Total                                                              $358,780,907
- --------------------------------------------------------------------------------


Class A Shares
- --------------------------------------------------------------------------------
Net Assets                                                         $281,270,579
Shares Outstanding                                                   29,564,427
Net Asset Value and Redemption Price Per Share
    (net assets / shares of beneficial interest outstanding)       $       9.51
Maximum Offering Price Per Share
    (100 / 94.25 of $9.51)                                         $      10.09
- --------------------------------------------------------------------------------


Class B Shares
- --------------------------------------------------------------------------------
Net Assets                                                         $ 69,025,929
Shares Outstanding                                                    4,616,607
Net Asset Value, Offering Price and Redemption Price Per Share
    (net assets / shares of beneficial interest outstanding)       $      14.95
- --------------------------------------------------------------------------------


Class C Shares
- --------------------------------------------------------------------------------
Net Assets                                                         $  8,484,399
Shares Outstanding                                                      586,431
Net Asset Value, Offering Price and Redemption Price Per Share
    (net assets / shares of beneficial interest outstanding)       $      14.47
- -------------------------------------------------------------------------------
On sales of $50,000 or more, the offering price of Class A shares is reduced.


Statement of Operations

For the Six Months Ended
June 30, 1998
Investment Income
- --------------------------------------------------------------------------------
Dividends allocated from Portfolio (net of
    foreign taxes, $39,230)                                        $  2,512,480
Interest allocated from Portfolio                                     3,557,199
Expenses allocated from Portfolio                                    (1,191,316)
- --------------------------------------------------------------------------------
Net investment income from Portfolio                               $  4,878,363
- --------------------------------------------------------------------------------


Expenses
- --------------------------------------------------------------------------------
Trustees fees and expenses                                         $      2,368
Distribution and service fees
        Class A                                                         152,201
        Class B                                                         310,819
        Class C                                                          38,430
Transfer and dividend disbursing agent fees                             239,476
Printing and postage                                                     37,060
Registration fees                                                        24,748
Custodian fee                                                            18,887
Legal and accounting services                                             8,914
Amortization of organization expenses                                     7,964
Miscellaneous                                                            10,545
- --------------------------------------------------------------------------------
Total expenses                                                     $    851,412
- --------------------------------------------------------------------------------


Net investment income                                              $  4,026,951
- --------------------------------------------------------------------------------


Realized and Unrealized
Gain (Loss) from Portfolio
- --------------------------------------------------------------------------------
Net realized gain (loss) --
    Investment transactions (identified cost basis)                $ 29,860,207
- --------------------------------------------------------------------------------
Net realized gain                                                  $ 29,860,207
- --------------------------------------------------------------------------------
Change in unrealized appreciation (depreciation) --
    Investments                                                    $    316,121
- --------------------------------------------------------------------------------
Net change in unrealized appreciation (depreciation)               $    316,121
- --------------------------------------------------------------------------------

Net realized and unrealized gain                                   $ 30,176,328
- --------------------------------------------------------------------------------

Net increase in net assets from operations                         $ 34,203,279
- --------------------------------------------------------------------------------

                       See notes to financial statements

                                       3
<PAGE>

Eaton Vance Balanced Fund as of June 30, 1998 

FINANCIAL STATEMENTS CONT'D

Statements of Changes in Net Assets

                                                                      
                                          Six Months Ended                     
Increase (Decrease)                       June 30, 1998       Year Ended       
in Net Assets                             (Unaudited)         December 31, 1997
- --------------------------------------------------------------------------------
From operations --
    Net investment income                     $  4,026,951         $  6,043,945
    Net realized gain                           29,860,207           20,676,352
    Net change in unrealized
        appreciation (depreciation)                316,121           23,123,556
- --------------------------------------------------------------------------------
Net increase in net assets
    from operations                           $ 34,203,279         $ 49,843,853
- --------------------------------------------------------------------------------
Distributions to shareholders --
    From net investment income
        Class A                               $ (2,976,268)        $ (5,802,058)
        Class B                                   (448,104)                  --
        Class C                                    (57,979)                  --
    From net realized gain
        Class A                                   (108,126)         (25,427,692)
        Class B                                     (16,47)                  --
        Class C                                     (1,924)                  --
- --------------------------------------------------------------------------------
Total distributions to shareholders           $ (3,608,448)        $(31,229,750)
- --------------------------------------------------------------------------------
Transactions in shares of
    beneficial interest --
    Proceeds from sale of shares
        Class A                               $  4,266,627         $  8,832,967
        Class B                                  8,825,210                   --
        Class C                                  2,013,230                   --
    Net asset value of shares issued to 
        shareholders in payment of
        distributions declared
        Class A                                  1,727,391           22,842,764
        Class B                                    403,526                   --
        Class C                                     57,603                   --
    Cost of shares redeemed
        Class A                                (12,767,591)         (26,777,414)
        Class B                                 (5,312,795)                  --
        Class C                                 (1,566,441)                  --
- --------------------------------------------------------------------------------
Net increase (decrease) in net assets 
    from Fund share transactions              $ (2,353,240)        $  4,898,317
- --------------------------------------------------------------------------------
Contribution from EV Marathon and 
    Classic Investors Fund                    $ 66,809,498         $         --
- --------------------------------------------------------------------------------

Net increase in net assets                    $ 95,051,089         $ 23,512,420
- --------------------------------------------------------------------------------

                                          Six Months Ended                     
                                          June 30, 1998       Year Ended       
Net Assets                                (Unaudited)         December 31, 1997
- --------------------------------------------------------------------------------
At beginning of period                        $263,729,818         $240,217,398
- --------------------------------------------------------------------------------
At end of period                              $358,780,907         $263,729,818
- --------------------------------------------------------------------------------


Accumulated undistributed net
investment income included in net
assets
- --------------------------------------------------------------------------------
At end of period                              $    776,352         $    205,985
- --------------------------------------------------------------------------------


                       See notes to financial statements

                                       4
<PAGE>

Eaton Vance Balanced Fund as of June 30, 1998 

FINANCIAL STATEMENTS CONT'D

Financial Highlights
<TABLE> 
<CAPTION> 
                                              Six Months Ended           Year Ended December 31,         Year Ended January 31,
                                              June 30, 1998           -----------------------------  -----------------------------
                                              (Unaudited)                1997      1996     1995*      1995       1994      1993
                                       -----------------------------  -----------------------------  -----------------------------
                                        Class A   Class B   Class C    Class A   Class A   Class A    Class A    Class A   Class A
- -----------------------------------------------------------------------------------------------------------------------------------
<S>                                    <C>       <C>       <C>        <C>       <C>       <C>        <C>        <C>       <C> 
Net asset value -- Beginning of                                                                                                    
    period                             $  8.700  $ 13.680  $ 13.240   $  8.090  $  8.150  $  6.840   $  7.600   $  7.390  $  7.500 
- -----------------------------------------------------------------------------------------------------------------------------------


Income (loss) from operations
- -----------------------------------------------------------------------------------------------------------------------------------
Net investment income                  $  0.115  $  0.118  $  0.112   $  0.208  $  0.254  $  0.254   $  0.283   $  0.217  $  0.342
Net realized and unrealized gain                                                                                                   
    (loss)                                0.799     1.256     1.222      1.492     0.821     1.641     (0.623)     0.833     0.318 
- -----------------------------------------------------------------------------------------------------------------------------------
Total income (loss) from operations    $  0.914  $  1.374  $  1.334   $  1.700  $  1.075  $  1.895   $ (0.340)  $  1.050  $  0.660
- -----------------------------------------------------------------------------------------------------------------------------------


Less distributions
- -----------------------------------------------------------------------------------------------------------------------------------
From net investment income             $ (0.100) $ (0.100) $ (0.100)  $ (0.200) $ (0.254) $ (0.248)  $ (0.275)  $ (0.307) $ (0.360)
In excess of net investment income           --        --        --         --    (0.001)       --         --     (0.008)       --
From net realized gain                   (0.004)   (0.004)   (0.004)    (0.890)   (0.880)   (0.337)    (0.145)    (0.525)   (0.410)
- -----------------------------------------------------------------------------------------------------------------------------------
Total distributions                    $ (0.104) $ (0.104) $ (0.104)  $ (1.090) $ (1.135) $ (0.585)  $ (0.420)  $ (0.840) $ (0.770)
- -----------------------------------------------------------------------------------------------------------------------------------

Net asset value -- End of period       $  9.510  $ 14.950  $ 14.470   $  8.700  $  8.090  $  8.150   $  6.840   $  7.600  $  7.390
- -----------------------------------------------------------------------------------------------------------------------------------

Total Return/(1)/                         10.53%    10.05%    10.09%     21.60%    13.61%    28.36%     (4.45)%    15.13%     9.30%
- -----------------------------------------------------------------------------------------------------------------------------------


Ratios/Supplemental Data
- -----------------------------------------------------------------------------------------------------------------------------------
Net assets, end of period (000's                                                                                                   
    omitted)                           $281,271  $ 69,026  $  8,484   $263,730  $240,217  $236,870   $200,419   $227,402  $212,545 
Ratios (As a percentage of average
    daily net assets):                                                                                                              
    Expenses/(2)/                          1.00%+    1.85%+    1.85%+     0.97%     0.93%     0.95%+     0.91%      0.90%     0.89% 
    Net investment income                  2.49%+    1.64%+    1.64%+     2.35%     3.03%     3.60%+     4.05%      4.07%     4.62%
Portfolio turnover/(3)/                      --        --        --         --        --        --         --         44%       32%
- -----------------------------------------------------------------------------------------------------------------------------------
</TABLE> 

+     Annualized.
*     For the eleven month period ended December 31, 1995.
/(1)/ 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.
/(2)/ Includes the Fund's share of its Portfolio's allocated expenses.
/(3)/ 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

                                       5
<PAGE>
 
Eaton Vance Balanced Fund as of June 30, 1998 

NOTES TO FINANCIAL STATEMENTS (Unaudited)


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 June 30, 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. For investments held directly, interest
   income was determined on the basis of interest accrued, adjusted for
   amortization of premium or discount when required for federal income tax
   purposes and dividend income was recorded on the ex-dividend date.

   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.

   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 Expense Reduction -- Investors Bank & Trust Company (IBT) serves as
   custodian to the Fund and the Portfolio. Pursuant to the respective custodian
   agreements, IBT receives a fee reduced by credits which are determined based
   on the average daily cash balances the Fund or Portfolio maintains with IBT.
   All significant credit balances used to reduce the Fund's custodian fees are
   reflected as a reduction of operating expenses on the Statement of
   Operations.

   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 revenue and expense during the reporting period. Actual results
   could differ from those estimates.

   H Interim Financial Statements -- The interim financial statements relating
   to June 30, 1998 and for the six months then ended have not been audited by
   independent certified public accountants, but in the opinion of the Fund's
   management, reflect all adjustments, consisting only of normal recurring
   adjustments, necessary for the fair presentation of the financial statements.

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

                                       6
<PAGE>
 
Eaton Vance Balanced Fund as of June 30, 1998 

NOTES TO FINANCIAL STATEMENTS (Unaudited) CONT'D


   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.


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:

                                           Six Months Ended
                                           June 30, 1998      Year Ended
   Class A                                 (Unaudited)        December 31, 1997
   -----------------------------------------------------------------------------
   Sales                                            456,599           1,006,180
                                      
   Issued to shareholders electing to 
     receive payments of distributions 
     in Fund shares                                 185,329           2,664,443

   Redemptions                                   (1,384,520)         (3,051,117)
   -----------------------------------------------------------------------------

   Net increase (decrease)                         (742,592)            619,506
   -----------------------------------------------------------------------------
                               
                                                               Six Months Ended
                                                               June 30, 1998
   Class B                                                     (Unaudited)
   -----------------------------------------------------------------------------
   Sales                                                                600,807

   Issued to shareholders electing to 
     receive payment of distributions 
     in Fund shares                                                      27,470
  
   Redemptions                                                         (361,543)
  
   Issued to EV Marathon Investors Fund shareholders                  4,349,873
   -----------------------------------------------------------------------------

   Net increase                                                       4,616,607
   -----------------------------------------------------------------------------

                                                               Six Months Ended
                                                               June 30, 1998
   Class C                                                     (Unaudited)
   -----------------------------------------------------------------------------
   Sales                                                                140,723
  
   Issued to shareholders electing to 
     receive payment of distributions 
     in Fund shares                                                       4,057

   Redemptions                                                         (110,355)

   Issued to EV Classic Investors Fund shareholders                     552,006
   -----------------------------------------------------------------------------

   Net increase                                                         586,431
   -----------------------------------------------------------------------------


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 $11,396 from the Eaton
   Vance Balanced Fund as its portion of the sales charge on sales of Class A
   shares for the six months ended June 30, 1998.

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

5  Distribution Plan
   -----------------------------------------------------------------------------
   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, the Plans). The Plans require the Fund to pay the
   Principal Underwriter, Eaton Vance Distributors, Inc. (EVD) amounts equal to
   1/365 of 0.75% of the Fund's average daily net assets attributable to both
   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) distribution fees

                                       7
<PAGE>
 
Eaton Vance Balanced Fund as of June 30, 1998 

NOTES TO FINANCIAL STATEMENTS (Unaudited) CONT'D


   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 daily amounts theretofore paid to EVD by each
   respective class. The Fund paid or accrued $243,465 and $30,017 for Class B
   and Class C shares, respectively, to EVD for the six months ended June 30,
   1998, representing 0.75% (annualized) of the average daily net assets for
   Class B and Class C shares. At June 30, 1998, the amount of Uncovered
   Distribution Charges EVD calculated under the Plan was approximately
   $1,580,000 and $1,082,000 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 six months ended June 30, 1998 amounted
   to $152,201, $67,354, and $8,413 for Class A, Class B, and Class C shares,
   respectively.


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. 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 $56,000 and $1,000 of CDSC paid by shareholders for
   Class B and Class C shares, respectively, for the six months ended June 30,
   1998.

7  Investment Transactions
   -----------------------------------------------------------------------------
   Increases and decreases in the Fund's investment in the Portfolio for the six
   months ended June 30, 1998, aggregated $16,165,337 and $21,634,273
   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.

                                       8
<PAGE>
 
Eaton Vance Balanced Fund as of June 30, 1998 

NOTES TO FINANCIAL STATEMENTS (Unaudited) CONT'D


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.

                                       9
<PAGE>
 
Balanced Portfolio as of June 30, 1998
PORTFOLIO OF INVESTMENTS (Unaudited)




Common Stocks -- 66.0%                                                 

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

Aerospace and Defense -- 0.9%
- -------------------------------------------------------------------------
General Motors Corp., Class H*            60,000            $  2,827,500
Raytheon Co., Class A                      3,826                 220,473
- -------------------------------------------------------------------------
                                                            $  3,047,973
- -------------------------------------------------------------------------

Auto and Parts -- 2.5%
- -------------------------------------------------------------------------
General Motors Corp.                      60,000            $  4,008,750
Magna International, Inc., Class A        75,000               5,146,875
- -------------------------------------------------------------------------
                                                            $  9,155,625
- -------------------------------------------------------------------------

Banks - Regional -- 1.9%
- -------------------------------------------------------------------------
Norwest Corp.                            180,000            $  6,727,500
- -------------------------------------------------------------------------
                                                            $  6,727,500
- -------------------------------------------------------------------------

Banks and Money Services -- 0.6%
- -------------------------------------------------------------------------
Banco Latinoamericano de                  
Exportaciones                             75,000            $  2,306,250
- -------------------------------------------------------------------------
                                                            $  2,306,250
- -------------------------------------------------------------------------

Beverages -- 0.9%
- -------------------------------------------------------------------------
PepsiCo, Inc.                             80,000            $  3,295,000
- -------------------------------------------------------------------------
                                                            $  3,295,000
- -------------------------------------------------------------------------

Chemicals -- 2.1%
- -------------------------------------------------------------------------
Monsanto Co.                              65,000            $  3,631,875
Praxair, Inc.                             80,000               3,745,000
- -------------------------------------------------------------------------
                                                            $  7,376,875
- -------------------------------------------------------------------------

Computers and Business Equipment -- 1.0%
- -------------------------------------------------------------------------
Hewlett-Packard Co.                       60,000            $  3,592,500
- -------------------------------------------------------------------------
                                                            $  3,592,500
- -------------------------------------------------------------------------

Drugs -- 8.5%
- -------------------------------------------------------------------------
Elan Corp., PLC ADR*                      75,000            $  4,823,438
Lilly (Eli) & Co.                         70,000               4,624,375
Pfizer, Inc.                              37,800               4,108,388
Sepracor, Inc.*                           80,000               3,320,000
SmithKline Beecham PLC ADR                70,000               4,235,000
- -------------------------------------------------------------------------
Warner-Lambert Co.                       135,000               9,365,624
- -------------------------------------------------------------------------
                                                            $ 30,476,825
- -------------------------------------------------------------------------

Electric Utilities -- 1.1%
- -------------------------------------------------------------------------
The Southern Co.                         140,000            $  3,876,250
- -------------------------------------------------------------------------
                                                            $  3,876,250
- -------------------------------------------------------------------------

Electronics - Semiconductors -- 2.2%
- -------------------------------------------------------------------------
Intel Corp.                               70,000            $  5,188,750
LSI Logic, Inc.*                         120,000               2,767,500
- -------------------------------------------------------------------------
                                                            $  7,956,250
- -------------------------------------------------------------------------

Environmental Services -- 1.2%
- -------------------------------------------------------------------------
U.S.A. Waste Services, Inc.*              90,000            $  4,443,750
- -------------------------------------------------------------------------
                                                            $  4,443,750
- -------------------------------------------------------------------------

Financial - Miscellaneous -- 3.4%
- -------------------------------------------------------------------------
Federal National Mortgage                 
Association                               75,000            $  4,556,250
MBNA Corp.                               120,000               3,960,000
MGIC Investment Corp.                     65,000               3,709,063
- -------------------------------------------------------------------------
                                                            $ 12,225,313
- -------------------------------------------------------------------------

Foods -- 3.0%
- -------------------------------------------------------------------------
Tyson Foods, Inc.                        164,700            $  3,571,931
Unilever ADR                              92,000               7,262,250
- -------------------------------------------------------------------------
                                                            $ 10,834,181
- -------------------------------------------------------------------------

Insurance -- 7.3%
- -------------------------------------------------------------------------
Allstate Corp. (The)                      60,000            $  5,493,750
General RE Corp.                          30,000               7,605,000
Mutual Risk Management Ltd.              186,600               6,799,238
SunAmerica, Inc.                         110,000               6,318,125
- -------------------------------------------------------------------------
                                                            $ 26,216,113
- -------------------------------------------------------------------------

Machinery -- 1.1%
- -------------------------------------------------------------------------
Deere and Co.                             75,000            $  3,965,625
- -------------------------------------------------------------------------
                                                            $  3,965,625
- -------------------------------------------------------------------------

                       See notes to financial statements

                                      10
<PAGE>
 
Balanced Portfolio as of June 30, 1998
PORTFOLIO OF INVESTMENTS (Unaudited) CONT'D



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

Medical Products -- 4.7%
- -------------------------------------------------------------------------
Baxter International, Inc.                55,000            $  2,959,688
Boston Scientific Corp.*                  75,000               5,371,875
Sofamor Danek Group, Inc.*               100,300               8,682,218
- -------------------------------------------------------------------------
                                                            $ 17,013,781
- -------------------------------------------------------------------------

Metals and Minerals -- 2.1%
- -------------------------------------------------------------------------
J & L Specialty Steel, Inc.              200,000            $  1,187,500
Potash Corp. of Saskatchewan**            55,000               4,155,938
Steel Dynamics Corp.*                    150,000               2,081,250
- -------------------------------------------------------------------------
                                                            $  7,424,688
- -------------------------------------------------------------------------

Oil and Gas - Equipment and Services -- 0.8%
- -------------------------------------------------------------------------
Rowan Companies, Inc.*                   140,000            $  2,721,250
- -------------------------------------------------------------------------
                                                            $  2,721,250
- -------------------------------------------------------------------------

Oil and Gas - Exploration
and Production -- 2.0%
- -------------------------------------------------------------------------
Anadarko Petroleum Corp.                  60,000            $  4,031,250
Triton Energy Ltd.*                       90,000               3,211,875
- -------------------------------------------------------------------------
                                                            $  7,243,125
- -------------------------------------------------------------------------

Oil and Gas - Integrated -- 2.2%
- -------------------------------------------------------------------------
Exxon Corp.                               67,280            $  4,797,905
Mobil Corp.                               40,000               3,065,000
- -------------------------------------------------------------------------
                                                            $  7,862,905
- -------------------------------------------------------------------------

Paper and Forest Products -- 0.8%
- -------------------------------------------------------------------------
Plum Creek Timber Co., L.P.               90,000            $  2,705,625
- -------------------------------------------------------------------------
                                                            $  2,705,625
- -------------------------------------------------------------------------

Publishing -- 2.6%
- -------------------------------------------------------------------------
Central Newspapers, Inc., Class A         70,000            $  4,882,500
McGraw-Hill Companies, Inc. (The)         56,500               4,608,281
- -------------------------------------------------------------------------
                                                            $  9,490,781
- -------------------------------------------------------------------------

REITS -- 3.3%
- -------------------------------------------------------------------------
Equity Office Properties Trust           110,000            $  3,121,250
Equity Residential Properties Trust      101,400               4,810,163
Security Capital Group                     6,982                   2,400
Security Capital Industrial Trust        150,000               3,750,000
- -------------------------------------------------------------------------
                                                            $ 11,683,813
- -------------------------------------------------------------------------

Retail - Food and Drug -- 3.4%
- -------------------------------------------------------------------------
CVS Corp.                                190,000            $  7,398,125
Safeway, Inc.*                           120,000               4,882,500
- -------------------------------------------------------------------------
                                                            $ 12,280,625
- -------------------------------------------------------------------------

Retail - Specialty and Apparel -- 4.0%
- -------------------------------------------------------------------------
Fastenal Co.                              52,500            $  2,437,969
Home Depot, Inc. (The)                   100,000               8,306,249
Republic Industries, Inc.*               150,000               3,750,000
- -------------------------------------------------------------------------
                                                            $ 14,494,218
- -------------------------------------------------------------------------

Specialty Chemicals and Materials -- 1.4%
- -------------------------------------------------------------------------
Corning, Inc.                             80,000            $  2,780,000
Millipore Corp.                           80,000               2,180,000
- -------------------------------------------------------------------------
                                                            $  4,960,000
- -------------------------------------------------------------------------

Telephone Utilities -- 1.0%
- -------------------------------------------------------------------------
Ameritech Corp.                           80,896            $  3,630,208
- -------------------------------------------------------------------------
                                                            $  3,630,208
- -------------------------------------------------------------------------

Total Common Stocks
    (identified cost $146,306,236)                          $237,007,049
- -------------------------------------------------------------------------


Convertible Preferred Stock -- 0.7%


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

Metals - Gold -- 0.7%
- -------------------------------------------------------------------------
Freeport McMoRan Copper & Gold,
5% Series CV                             125,000            $  2,437,500
- -------------------------------------------------------------------------
                                                            $  2,437,500
- -------------------------------------------------------------------------

Total Convertible Preferred Stock
    (identified cost $2,872,500)                            $  2,437,500
- -------------------------------------------------------------------------

                       See notes to financial statements

                                      11
<PAGE>
 
Balanced Portfolio as of June 30, 1998
PORTFOLIO OF INVESTMENTS (Unaudited) CONT'D


Corporate Bonds -- 18.7%                                                  


                                        Principal
                                        Amount
Security                                (000's Omitted)     Value
- -------------------------------------------------------------------------
Air Products and Chemicals, Inc.,
7.34%, 6/15/26                          $    720            $    796,010
Associates Corp., N.A., 5.96%,             
5/15/37                                    4,000               4,162,400
Bell Telephone Co., 8.35%, 12/15/30        3,000               3,795,030
Chesapeake Potomac Telephone Co.,
8.375%, 10/1/29                            2,850               3,582,650
Commercial Credit Corp., 7.875%,           
2/1/25                                     2,000               2,345,640
Commercial Credit Corp., 6.625%,           
6/1/15                                     1,350               1,416,731
Connecticut Light and Power Co.,
7.875%, 10/1/24                            3,775               4,523,469
General Motors Corp., 9.45%, 11/1/11       3,000               3,801,720
Grand Metropolitan Investments
Corp., 7.45%, 4/15/35                      3,090               3,501,372
Intermediate American Development
Bank, 8.40%, 9/1/09                        3,690               4,426,967
Intermediate American Development
Bank, 6.95%, 8/1/26                          220                 248,919
J.C. Penney, Inc., 7.40%, 4/1/37           2,075               2,322,195
Johnson Controls, Inc., 7.70%,             1,360               1,562,150
3/1/15
Lowe's Cos., Inc., 7.11%, 5/15/37          5,000               5,405,700
Mead Corp. (The), 6.84%, 3/1/37            2,000               2,106,500
Proctor and Gamble Co., 8.00%,                                           
9/1/24                                     3,000               3,678,840 
Seagram (Joseph) & Sons, Inc.,
9.65%, 8/15/18                             1,030               1,362,875
State Street Bank, 7.35%, 6/15/26          2,450               2,720,799
Tennessee Valley Power Authority,
6.235%, 7/15/45                              700                 727,090
Tennessee Valley Power Authority,
5.88%, 4/1/36                              3,350               3,496,429
Times Mirror Co., 6.61%, 9/15/27           3,250               3,415,328
Tribune Co., 6.25%, 11/10/26               1,000               1,027,690
TRW, Inc., MTN, 9.35%, 6/4/20                900               1,197,135
Willamette Industries, 7.35%, 7/1/26       1,200               1,325,664
Xerox Corp., 5.90%, 5/5/37                 3,000               3,105,630
Xerox Corp., 5.875%, 6/15/37               1,000               1,037,830
- -------------------------------------------------------------------------

Total Corporate Bonds
    (identified cost $62,917,215)                           $ 67,092,763
- -------------------------------------------------------------------------

U.S. Treasury Obligations -- 14.0%

                                        Principal
                                        Amount
Security                                (000's Omitted)     Value
- -------------------------------------------------------------------------
FHLMC, PAC, CMO, Series 1206-GA,
7.00%, 3/15/18                          $  1,740            $  1,736,918
FHLMC, PAC, CMO, Series 1258-D,
8.00%, 9/15/05                             2,131               2,134,999
FHLMC, PAC, CMO, Series 34-C,
9.00%, 11/15/19                              203                 206,194
FHLMC, PAC, CMO, Series 41-F,
10.00%, 5/15/20                            1,470               1,596,716
FNMA, PAC, CMO, Series 1990 24-E,
9.00%, 3/25/20                             1,279               1,332,672
U.S. Treasury Note, 5.75%, 11/30/02       10,000              10,084,299
U.S. Treasury Note, 7.125%, 9/30/99       10,000              10,192,099
U.S. Treasury Note, 6.125%, 9/30/00        4,000               4,049,960
U.S. Treasury Note, 8.50%, 2/15/00        15,000              15,684,299
U.S. Treasury Note, 6.125%, 8/31/98        3,500               3,505,180
- -------------------------------------------------------------------------

Total U.S. Treasury Obligations
    (identified cost $50,715,018)                           $ 50,523,336
- -------------------------------------------------------------------------

Commercial Paper -- 1.6%

                                         Principal
                                         Amount
Security                                 (000's Omitted)    Value
- -------------------------------------------------------------------------
General Electric Capital Corp.,           $5,712            $  5,712,000
6.10%, 7/1/98
- -------------------------------------------------------------------------

Total Commercial Paper
    (amortized cost $5,712,000)                             $  5,712,000
- -------------------------------------------------------------------------

Total Investments -- 101.0%
    (identified cost $268,522,969)                          $362,772,648
- -------------------------------------------------------------------------

Other Assets, Less Liabilities -- (1.0)%                    $ (3,479,649)
- -------------------------------------------------------------------------


Net Assets -- 100%                                          $359,292,999
- -------------------------------------------------------------------------

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



                       See notes to financial statements

                                      12
<PAGE>

Balanced Portfolio  as of June 30, 1998

FINANCIAL STATEMENTS (Unaudited)

Statement of Assets and Liabilities

As of June 30, 1998
Assets
- --------------------------------------------------------------------------------
Investments, at value (identified cost, $268,522,969)             $362,772,648
Cash                                                                     1,648
Receivable for investments sold                                         89,394
Interest and dividends receivable                                    2,243,532
Tax reclaim receivable                                                   3,377
Deferred organization expenses                                             520
- --------------------------------------------------------------------------------
Total assets                                                      $365,111,119
- --------------------------------------------------------------------------------
                                                           
                                                           
Liabilities                                                
- --------------------------------------------------------------------------------
Payable for investments purchased                                 $  5,778,740
Payable to affiliate for Trustees' fees                                  9,950
Other accrued expenses                                                  29,430
- --------------------------------------------------------------------------------
Total liabilities                                                 $  5,818,120
- --------------------------------------------------------------------------------
Net Assets applicable to investors' interest in Portfolio         $359,292,999
- --------------------------------------------------------------------------------
                                                           
                                                           
Sources of Net Assets                                      
- --------------------------------------------------------------------------------
Net proceeds from capital contributions and withdrawals           $265,043,320
Net unrealized appreciation (computed on the basis                             
    of identified cost)                                             94,249,679 
- --------------------------------------------------------------------------------
Total                                                             $359,292,999
- --------------------------------------------------------------------------------

                                                           
Statement of Operations                                    
                                                           
For the Six Months Ended                                   
June 30, 1998                                              
Investment Income                                          
- --------------------------------------------------------------------------------
Dividends (net of foreign taxes, $39,230)                         $  2,512,480
Interest                                                             3,557,199
- --------------------------------------------------------------------------------
Total investment income                                           $  6,069,679
- --------------------------------------------------------------------------------
                                                           
                                                           
Expenses                                                   
- --------------------------------------------------------------------------------
Investment adviser fee                                            $  1,070,461
Trustees fees and expenses                                              14,977
Custodian fee                                                           84,426
Legal and accounting services                                           17,100
Amortization of organization expenses                                    1,593
Miscellaneous                                                            2,759
- --------------------------------------------------------------------------------
Total expenses                                                    $  1,191,316
- --------------------------------------------------------------------------------
                                                           
Net investment income                                             $  4,878,363
- --------------------------------------------------------------------------------
                                                           
                                                           
Realized and Unrealized                                    
Gain (Loss)                                                
- --------------------------------------------------------------------------------
Net realized gain (loss) --                                
    Investment transactions (identified cost basis)               $ 29,860,210
- --------------------------------------------------------------------------------
Net realized gain                                                 $ 29,860,210
- --------------------------------------------------------------------------------
Change in unrealized appreciation (depreciation) --        
    Investments (identified cost basis)                           $    316,120
- --------------------------------------------------------------------------------
Net change in unrealized appreciation (depreciation)              $    316,120
- --------------------------------------------------------------------------------
                                                           
Net realized and unrealized gain                                  $ 30,176,330
- --------------------------------------------------------------------------------
                                                           
Net increase in net assets from operations                        $ 35,054,693
- --------------------------------------------------------------------------------

                       See notes to financial statements

                                      13

<PAGE>


Balanced Portfolio as of June 30, 1998 

FINANCIAL STATEMENTS CONT'D 

Statements of Changes in Net Assets


                                                    
                                       Six Months Ended                      
Increase (Decrease)                    June 30, 1998        Year Ended        
in Net Assets                          (Unaudited)          December 31, 1997 
- --------------------------------------------------------------------------------
From operations --                
    Net investment income                 $  4,878,363          $   8,365,076
    Net realized gain                       29,860,210             24,802,364
    Net change in unrealized      
        appreciation (depreciation)            316,120             29,330,948
- --------------------------------------------------------------------------------
Net increase in net assets        
    from operations                       $ 35,054,693          $  62,498,388
- --------------------------------------------------------------------------------
Capital transactions --           
    Contributions                         $ 16,165,337          $  27,019,040
    Withdrawals                            (21,634,273)           (61,370,968)
- --------------------------------------------------------------------------------
Net decrease in net assets        
    from capital transactions             $ (5,468,936)         $ (34,351,928)
- --------------------------------------------------------------------------------
                                  
Net increase in net assets                $ 29,585,757          $  28,146,460
- --------------------------------------------------------------------------------

                                  
Net Assets                        
- --------------------------------------------------------------------------------
At beginning of period                    $329,707,242          $ 301,560,782
- --------------------------------------------------------------------------------
At end of period                          $359,292,999          $ 329,707,242
- --------------------------------------------------------------------------------

                       See notes to financial statements

                                      14
<PAGE>

Balanced Portfolio  as of June 30, 1998

FINANCIAL STATEMENTS CONT'D

Supplementary Data
<TABLE> 
<CAPTION> 

                                           Six Months Ended        Year Ended December 31,             Year Ended January 31,
                                           June 30, 1998   --------------------------------------     ------------------------
                                           (Unaudited)        1997         1996         1995*            1995        1994**
- ------------------------------------------------------------------------------------------------------------------------------
<S>                                        <C>             <C>           <C>           <C>            <C>          <C> 

Ratios to average daily net assets
- ------------------------------------------------------------------------------------------------------------------------------
Expenses                                         0.68%+        0.69%         0.70%         0.71%+         0.70%        0.69%+
Net investment income                            2.80%+        2.62%         3.23%         3.83%+         4.25%        3.69%+
Portfolio Turnover                                 25%           37%           64%           47%            28%          15%
- ------------------------------------------------------------------------------------------------------------------------------
Net assets, end of period (000's omitted)    $359,293      $329,707      $301,561      $276,375       $217,157     $230,334
- ------------------------------------------------------------------------------------------------------------------------------
</TABLE> 
+  Annualized.
*  For the eleven month period ended December 31, 1995.
** For the period from the start of business, October 28, 1993, to January 31,
   1994.


                       See notes to financial statements

                                      15
<PAGE>
 
Balanced Portfolio as of June 30, 1998

NOTES TO FINANCIAL STATEMENTS (Unaudited)


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 a matrix pricing system which takes into
   account yield differentials, anticipated prepayments and interest rates.
   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 Expense Reduction -- Investors Bank & Trust Company (IBT) serves as
   custodian of the Portfolio. Pursuant to the custodian agreement, IBT receives
   a fee reduced by credits which are determined based on the average daily cash
   balances the Portfolio maintains with IBT. All significant credit balances
   used to reduce the Portfolio's custodian fees are reported as a reduction of
   expenses on the Statement of Operations.

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

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

                                      16
<PAGE>
 
Balanced Portfolio as of June 30, 1998

NOTES TO FINANCIAL STATEMENTS (Unaudited) CONT'D


   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.

   I Interim Financial Statements -- The interim financial statements relating
   to June 30, 1998 and for the six months then ended have not been audited by
   independent certified public accountants, but in the opinion of the Fund's
   management, reflect all adjustments, consisting only of normal recurring
   adjustments, necessary for the fair presentation of the financial statements.


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 six months ended 
   June 30, 1998 the fee was equivalent to 0.61% (annualized) of the Portfolio's
   average net assets for such period and amounted to $1,070,461. 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
   six months ended June 30, 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 $55,963,740 and $59,807,945, respectively.
   Purchases and sales of U.S. Government/agency securities aggregated
   $30,685,430 and $26,012,777, respectively.


4  Federal Income Tax Basis of Investments
   -----------------------------------------------------------------------------
   The cost and unrealized appreciation (depreciation) in the value of
   investments owned at June 30, 1998, as computed on a federal income tax
   basis, are as follows:


   Aggregate cost                                                  $268,522,969
   -----------------------------------------------------------------------------

   Gross unrealized appreciation                                   $104,138,145

   Gross unrealized depreciation                                     (9,888,466)
   -----------------------------------------------------------------------------

   Net unrealized appreciation                                     $ 94,249,679
   -----------------------------------------------------------------------------


5  Line of Credit
   -----------------------------------------------------------------------------
   The Portfolio participates with other portfolios and funds managed by BMR and
   EVM and its affiliates in a $100 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

                                      17
<PAGE>
 
Balanced Portfolio as of June 30, 1998

NOTES TO FINANCIAL STATEMENTS (Unaudited) CONT'D


   (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.

                                      18
<PAGE>

Eaton Vance Balanced Fund  as of June 30, 1998

INVESTMENT MANAGEMENT


Eaton Vance Balanced Fund

                     Officers             
                     James B. Hawkes      
                     President and Trustee
                                          
                     Edward E. Smiley, Jr 
                     Vice President       
                                          
                     James L. O'Connor    
                     Treasurer            
                                          
                     Alan R. Dynner       
                     Secretary             


                     Trustees                                          
                     M. Dozier Gardner                                 
                     Vice Chairman, Eaton Vance Management             
                                                                       
                     Donald R. Dwight                                  
                     President, Dwight Partners, Inc.                  
                                                                       
                     Samuel L. Hayes, III                              
                     Jacob H. Schiff Professor of Investment           
                     Banking, Harvard University Graduate School of    
                     Business Administration                           
                                                                       
                     Norton H. Reamer                                  
                     Chairman and Chief Executive Officer, United Asset 
                     Management Corporation                            
                                                                       
                     John L. Thorndike                                 
                     Formerly Director, Fiduciary Company Incorporated 
                                                                       
                     Jack L. Treynor                                   
                     Investment Adviser and Consultant                  


Balanced Portfolio

                     Officers                  
                     M. Dozier Gardner         
                     President and Trustee     
                                               
                     James B. Hawkes           
                     Vice President and Trustee
                                               
                     Thomas E. Faust, Jr.      
                     Vice President and        
                     Portfolio Manager         
                                               
                     Michael B. Terry          
                     Vice President            
                                               
                     James L. O'Connor         
                     Treasurer                 
                                               
                     Alan R. Dynner            
                     Secretary                  

                     Independent Trustees                               
                     Donald R. Dwight                                   
                     President, Dwight Partners, Inc.                   
                                                                        
                     Samuel L. Hayes, III                               
                     Jacob H. Schiff Professor of Investment            
                     Banking, Harvard University Graduate School of     
                     Business Administration                            
                                                                        
                     Norton H. Reamer                                   
                     Chairman and Chief Executive Officer, United Asset 
                     Management Corporation                             
                                                                        
                     John L. Thorndike                                  
                     Formerly Director, Fiduciary Company Incorporated  
                                                                        
                     Jack L. Treynor                                    
                     Investment Adviser and Consultant                   
                                                    
                                      19
<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






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 8/98




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