EATON VANCE PRIME RATE RESERVES
N-30D, 1995-08-24
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<PAGE>

PERFORMANCE HIGHLIGHTS

o  A CONSISTENT YIELD ADVANTAGE

   MONTH AFTER MONTH, THE FUND HAS PRODUCED A YIELD ADVANTAGE OVER 3-MONTH
   BANK CDS.

                                                AVERAGE YIELD
EFFECTIVE YIELD                                 ADVANTAGE 
SPREAD OVER                                     DURING PAST
3-MONTH                                         12 MONTHS
CD RATES                                        OF 3.57%

                Prime
Effective       Rate
Yield           Reserves       CDs         Spread
---------       --------      ----         ------
Jun 94              5.9       3.15           2.75
Jul 94              6         3.24           2.76
Aug 94              6.4       3.31           3.09
Sep 94              6.66      3.44           3.22
Oct 94              7.24      3.66           3.58
Nov 94              7.5       3.94           3.56
Dec 94              8         4.12           3.88
Jan 95              8.31      4.19           4.12
Feb 95              8.53      4.33           4.2
Mar 95              8         4.38           3.62
Apr 95              8         4.34           3.66
May 95              7.85      4.36           3.49
Jun 95              8         4.27           3.73

This bar chart shows the spread between the effective month-end yields of
Prime rate Reserves and CD yields from 6/30/94 through 6/30/95.
Sources: Eaton Vance, Wall Street Journal.

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

o  RELATIVE STABILITY OF NET ASSET VALUE

   DESPITE LINGERING QUESTIONS ABOUT THE ECONOMY AND A ROLLER-COASTER BOND
   MARKET, THE FUND CONTINUED TO MAINTAIN A RELATIVELY STABLE SHARE PRICE.

MONTH-END NET ASSET
VALUE PER SHARE

                 Prime
                 Rate
                 Reserves
Jun 94              10.00
Jul 94              10.00
Aug 94               9.96
Sep 94               9.96
Oct 94               9.97
Nov 94               9.97
Dec 94              10.02
Jan 95              10.02
Feb 95              10.04
Mar 95              10.04
Apr 95              10.03
May 95              10.03
Jun 95              10.03

This line chart shows the relative stability of the share price of EV Prime Rate
Reserves during the past twelve months.
Source: Eaton Vance Management. Uses month-end NAVs.
<PAGE>
TO SHAREHOLDERS

During the six months ended June 30, 1995  Eaton Vance Prime Rate Reserves 
shareholders once again realized a significant yield advantage over other 
short-term investments as the Fund's investments in a portfolio of senior, 
secured, floating rate loans met the Fund's objective of maintaining a high 
level of current income with a relatively stable net asset value.

THE ECONOMY CONTINUED TO GROW IN THE FIRST HALF, ALBEIT AT A SLOWER PACE...

The Federal Reserve's inflation-fighting efforts extended into February of this
year, with a final increase in the Federal funds rate, a key short-term interest
rate barometer. However, with few current signs of inflation to date, the
pressure on interest rates has since mitigated. Rising business inventories
contributed to a significant slowdown in the second quarter, with GDP rising a
modest 0.5 percent. Convinced that inflation posed no immediate threat to the
economy, the Fed lowered short-term rates at its July open market meeting.

PRIME RATE RESERVES MAINTAINED ITS  YIELD ADVANTAGE OVER OTHER SHORT-TERM 
FIXED INCOME INVESTMENTS...

The Fund paid shareholders distributions from net investment income totaling 
$0.393 during the first six months of the year. As the chart on page 4 
illustrates, the Fund had an effective yield of 8.0 percent at June 30. The 
Fund's yield continued to represent a significant advantage over money market 
mutual funds, 3-month certificates of deposit, and bank money market 
accounts, which offered rates of 5.61 percent, 4.27 percent, and 3.43 
percent, respectively. Of course, unlike bank certificates of deposit, the 
Fund is not insured and does not offer a fixed rate of return; and unlike 
money market accounts, the Fund's principal value and return can fluctuate 
with market conditions.  

RELATIVE STABILITY SERVED OUR SHAREHOLDERS WELL IN AN OTHERWISE VOLATILE 
FIXED INCOME MARKET...

While the fixed income markets have been volatile over the past 18 months, 
Prime Rate Reserves has continued to maintain a relatively stable share 
price, a major consideration for  investors in short-term instruments. Of 
course, past performance is no guarantee of future returns. But Prime Rate 
Reserves will continue its pursuit of attractive yields and relative price 
stability in senior floating rate loans as well as its efforts to maintain 
purchasing power for its shareholders.

On November 18, 1994 a proxy statement and ballot were circulated to 
shareholders of the Trust. Results of that ballot appear on page 6, following 
a management discussion with portfolio manager Jeffrey Garner.


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

[Photo of James B. Hawkes]

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


    Sincerely,

/s/ James B. Hawkes
    James B. Hawkes
    President
    August 21, 1995
<PAGE>
MANAGEMENT DISCUSSION

Questions and answers with Jeffrey S. Garner, Vice President and Portfolio 
Manager, Senior Debt Portfolio.

Q:  JEFF, THE FUND'S RETURN FOR THE SIX MONTH PERIOD SURPASSED MOST OTHER
    SHORT-TERM VEHICLES. TO WHAT DO YOU ATTRIBUTE THE FUND'S PERFORMANCE?

A:  The Fund has benefited from the relative stability of interest rates.
    Interest rates on the floating rate loans in which the Portfolio invests are
    generally pegged to LIBOR - the London Interbank Offered Rate. While U.S.
    interest rates have moved lower during the past six months, LIBOR has
    remained quite stable. That has resulted in a relatively stable rate
    structure for the Portfolio.

    Complementing the yield performance has been a relatively stable net asset
    value. The healthy economy has resulted in no significant credit weakenings,
    which has further buttressed the market.

Q:  HOW WOULD YOU CHARACTERIZE THE LOAN MARKET TO DATE IN 1995?

A:  Loan demand has been brisk so far in 1995, for several major reasons. First,
    with a fundamentally sound economy, the need for financing of new plant and
    equipment has continued to grow. Second, corporate acqusition activity has
    also picked up. Finally, there is growing enthusiasm and activity among the
    major investment banks within the loan market, including such participants
    as Merrill Lynch and Goldman Sachs.

Q:  HAS THE GROWTH IN LOAN VOLUME LED TO MORE OPPORTUNITIES FOR THE PORTFOLIO?

A:  Yes. Rising volume of loan transactions has improved our opportunities for
    selectivity as well as diversification. We have been able to increase the
    diversification of the Fund's portfolio during the period from 45 borrowers
    to 61 borrowers and from 21 industries to 25 industries. That is consistent
    with our belief in a broad but prudent diversification.

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

[Photo of Jeffrey S. Garner

---------------------------
Jeffrey S. Garner
---------------------------

    At Eaton Vance, we believe that diversification should span a relatively
    wide range of industries while maintaining consistent credit standards among
    our borrowers. We ensure that each analyst is responsible for a limited
    number of borrowers. We will not compromise the analysts' ability to monitor
    the Portfolio's investments for the sake of further marginal
    diversification.

Q:  CAN YOU GIVE SOME EXAMPLES OF YOUR INVESTMENT FOCUS IN RECENT MONTHS?

A:  The Portfolio maintained relatively large weightings in the paper, retail,
    and manufacturing sectors. Each of those segments has benefited from the
    expanding economy and each has witnessed a growing participation in the loan
    market. An area where the Portfolio widened its commitment was the broadcast
    media sector, as represented by additional loans involving broadcasters and
    cable television operators.

-------------------------------------------------------------------------------
PRIME RATE RESERVES: THE FUND MAINTAINED A SIZABLE YIELD ADVANTAGE OVER OTHER
POPULAR SHORT-TERM INVESTMENT VEHICLES.

All figures are as of 6/30/95. Prime Rate Reserves figure represents effective
yield (distribution for the latest 30-day period, annualized, divided by the
net asset value per share at athe end of the period, and then compounded over
a 12-month period). The Fund is not insured by the FDIC nor does it offer a 
fixed rate of return like bank certificates of deposit or bank money market
funds, and does not attempt to maintain a constant net asset value per share,
as do money market funds. Past performance is no guarantee of future results.
Principal value and investment return will fluctuate with changes in market
conditions.
Sources: Eaton Vance Management, The Wall Street Journal

Bank money market accounts       3.43%
3-month CDs                      4.27%
Money markets                    5.61%
Prime Rate reserves              8.00%

This bar chart shows the difference in yields between Prime Rate Reserves and
Money market mutual funds, 3-month CDs, and Bank money market accounts. The data
is from June 30, 1995. Source: Eaton Vance, Wall Street Journal
--------------------------------------------------------------------------------

Q:  IN PAST REPORTS, YOU'VE INDICATED THAT THE FUND IS MOST SUITABLE FOR
    INVESTORS WHO ARE "YIELD-HUNGRY, BUT RISK-AVERSE." IS THAT STILL TRUE TODAY?

A:  Yes, I think it's especially true in today's investment climate. We've seen
    a bond market rally of large proportions in 1995, and many investors fear
    that a correction may be due. Their uneasiness is amplified by the
    historically high levels of the stock market. That's especially unnerving
    for investors for whom capital preservation is an important goal.

    The Fund may represent a good complement to bonds and bond funds in the
    current environment. First, the Fund's distribution rate represents an
    attractive yield when compared to bonds. Second, - and this is especially
    important for the conservative investor - the relative stability of the
    Fund's share price is a welcome change from the recent volatility of the
    bond market. Just consider the harrowing rollercoaster ride of the past 18
    months.

Q:  THERE HAS BEEN A LOT OF TALK ABOUT A "SOFT LANDING" FOR THE ECONOMY. COULD
    THE DECLINE IN INTEREST RATES BE NEAR AN END?

A:  If the Fed has indeed been successful in engineering a soft landing, there
    is not likely to be much more near-term pressure to lower interest rates.
    Chairman Greenspan has indicated that he is not likely to push for another
    rate cut in the immediate future. Much anecdotal evidence suggests that the
    economy is firming a bit. Absent a recession, the Fed will be careful not to
    add too much fuel to the economy. Especially, given the Fed's oft-stated
    goal of discouraging inflation.

--------------------------------------------------------------------------------
                              PORTFOLIO HIGHLIGHTS
                                 June 30, 1995

GENERAL PORTFOLIO INFORMATION

    Total net assets . . . . . . . . . . . . . . . . . . .        $955 million
    Assets invested in loan interests  . . . . . . . . . .        $842 million
    Number of borrowers  . . . . . . . . . . . . . . . . . . . . . . . .    61
    Industries represented . . . . . . . . . . . . . . . . . . . . . . .    25

FUNDAMENTAL CHARACTERISTICS OF PORTFOLIO LOANS

    Senior  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      100%
    Secured . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      100%
    Floating rate . . . . . . . . . . . . . . . . . . . . . . . . . .      100%
    Commercial & industrial . . . . . . . . . . . . . . . . . . . . .      100%

AVERAGE PORTFOLIO STATISTICS (DOLLAR-WEIGHTED)

    Collateral coverage ratio . . . . . . . . . . . . . . . . . .    1.5 to 1*
    Days to interest-rate reset . . . . . . . . . . . . . . . . . . .       49
    Maturity  . . . . . . . . . . . . . . . . . . . . . . . . . .    5.7 years
    Size per borrower . . . . . . . . . . . . . . . . . . .      $13.8 million
    Average size as percent of total net assets . . . . . . . . . . .    1.45%

* At time of purchase

Source: Eaton Vance Management
--------------------------------------------------------------------------------

Q:  HOW MIGHT THAT IMPACT THE FUND?

A:  If the interest rate environment remains stable, the Fund should continue to
    enjoy a yield advantage over short-term rates. However, a stronger economy
    would bring still higher rates which should be reflected over time in the
    Fund's returns. The floating rate loan agreements in which the Portfolio has
    invested have interest rate reset provisions. The interest rates paid by
    borrowers are typically reset every 30, 60 or 90 days, thus quickly
    reflecting changes in the prevailing interest rate environment. If interest
    rates rise in general, the rates paid by the borrowers will also rise.
    Because the average interest rate reset period is a short 49 days at (June
    30), the Portfolio typically responds promptly to a change in interest
    rates. That represents a major advantage over traditional fixed income
    investments such as bonds, whose interest rates remain fixed and whose
    prices decline as rates rise.

Q:  WHAT IS YOUR OUTLOOK FOR THE LOAN MARKET?

A:  In my view, we should see growth in the loan market as the economy expands
    and the underwriting activity continues to increase. Naturally, past trends
    will not necessarily be repeated in the future. But if the soft landing is
    followed by another leg upward in the economy, floating rate loan investors
    are very likely to be beneficiaries of rising interest rate resets. That
    unique feature sets this investment apart from other short-term vehicles,
    and makes it a compelling choice for investors.

<PAGE>

    Eaton Vance Prime Rate Reserves (the "Trust") held a special shareholder
meeting on January 11, 1995 (which was an adjourned meeting from December 21,
1994) at which the following action was taken:

Proposal 1:  The approval of a new investment policy and supplemental
provision to the investment restrictions of the Trust to permit a new
investment structure.
                                                                NUMBER OF SHARES
                                                                ----------------

  For ...................................................        28,356,206.204
  Against ...............................................         1,513,076.146
  Abstain ...............................................         1,463,268.572
  Broker Non-Vote .......................................         4,785,909.000

Proposal 2(A):  The authorization of the Fund to elect as Trustees of the
Portfolio created by the aforementioned new investment structure the
following:  James B. Hawkes, M. Dozier Gardner, Donald R. Dwight, Samuel L.
Hayes, III, Norton H. Reamer, John L. Thorndike, Jack L. Treynor.

                                                                NUMBER OF SHARES
                                                                ----------------
  For ...................................................        35,055,240.024
  Against ...............................................         1,063,219.898

Proposal 2(B):  The ratification of the selection of Deloitte & Touche LLP as
independent certified public accountants of the Portfolio.

                                                                NUMBER OF SHARES
                                                                ----------------
  For ...................................................        34,253,450.358
  Against ...............................................           642,183.505
  Abstain ...............................................         1,198,769.059
  Broker Non-Vote .......................................            24,057.000

Proposal 2(C):  The approval of an Investment Advisory Agreement establishing
Boston Management and Research as an investment advisor to the Portfolio.

                                                                NUMBER OF SHARES
                                                                ----------------
  For ...................................................        33,456,596.509
  Against ...............................................         1,155,286.735
  Abstain ...............................................         1,488,605.678
  Broker Non-Vote .......................................            17,971.000

Proposal 3(A):  The approval of the elimination of the restriction concerning
investment in other investment companies.

                                                                NUMBER OF SHARES
                                                                ----------------
  For ...................................................        27,455,611.359
  Against ...............................................         2,072,067.750
  Abstain ...............................................         1,804,117.813
  Broker Non-Vote .......................................         4,786,633.000

Proposal 3(B):  The approval of the elimination of the restriction concerning
diversification of assets.

                                                                NUMBER OF SHARES
                                                                ----------------
  For ...................................................        27,703,449.027
  Against ...............................................         1,914,175.705
  Abstain ...............................................         1,714,172.190
  Broker Non-Vote .......................................         4,786,633.000

Proposal 3(C):  The approval of the elimination of the restriction concerning
investing for control or management of other companies.

                                                                NUMBER OF SHARES
                                                                ----------------
  For ...................................................        27,332,805.741
  Against ...............................................         2,121,300.565
  Abstain ...............................................         1,877,690.616
  Broker Non-Vote .......................................         4,786,633.000

Proposal 3(D):  The approval of the elimination of the restriction concerning
transactions with affiliates.

                                                                NUMBER OF SHARES
                                                                ----------------
  For ...................................................        27,230,063.999
  Against ...............................................         2,215,543.725
  Abstain ...............................................         1,886,189.198
  Broker Non-Vote .......................................         4,786,633.000

Proposal 3(E):  The approval of the reclassification of the restriction
concerning short sales.

                                                                NUMBER OF SHARES
                                                                ----------------
  For ...................................................        27,377,691.805
  Against ...............................................         2,068,195.797
  Abstain ...............................................         1,885,909.320
  Broker Non-Vote .......................................         4,786,633.000

Proposal 3(F):  The approval of the reclassification of the restriction
concerning investment in exploration companies.

                                                                NUMBER OF SHARES
                                                                ----------------
  For ...................................................        27,213,283.944
  Against ...............................................         2,268,615.079
  Abstain ...............................................         1,849,897.899
  Broker Non-Vote .......................................         4,786,633.000

Proposal 3(G):  The approval of the reclassification and amendment of the
restriction concerning unseasoned issuers.

                                                                NUMBER OF SHARES
                                                                ----------------
  For ...................................................        27,087,476.140
  Against ...............................................         2,336,310.089
  Abstain ...............................................         1,915,801.693
  Broker Non-Vote .......................................         4,778,872.000

Proposal 3(H):  The approval of the amendment of the restriction on borrowing.

                                                                NUMBER OF SHARES
                                                                ----------------
  For ...................................................        27,118,910.520
  Against ...............................................         2,350,006.136
  Abstain ...............................................         1,862,872.266
  Broker Non-Vote .......................................         4,786,671.000

Proposal 3(I):   The approval of the amendment of the restriction concerning
issuing senior securities.

                                                                NUMBER OF SHARES
                                                                ----------------
  For ...................................................        27,303,495.371
  Against ...............................................         2,151,505.048
  Abstain ...............................................         1,876,776.503
  Broker Non-Vote .......................................         4,786,633.000

Proposal 4:    The ratification of the selection of Deloitte & Touche LLP as
independent certified public accountants of the Fund.

                                                                NUMBER OF SHARES
                                                                ----------------
  For ...................................................        33,867,476.232
  Against ...............................................           807,176.974
  Abstain ...............................................         1,430,167.716
  Broker Non-Vote .......................................            13,639.000

<PAGE>

                             FINANCIAL STATEMENTS
                     STATEMENT OF ASSETS AND LIABILITIES
------------------------------------------------------------------------------
                          June 30, 1995 (Unaudited)
------------------------------------------------------------------------------
ASSETS:
  Investment in Senior Debt Portfolio, at value
    (Note 1A) (identified cost, $806,396,256)                   $801,958,921
  Receivable for Trust shares sold                                10,246,004
                                                                ------------
        Total assets                                            $812,204,925
LIABILITIES:
  Distributions payable                             $3,283,792
  Payable for Trust shares reacquired                   10,031
  Payable to affiliates --
    Trustees' fees                                       5,193
    Custodian fee                                        1,000
  Accrued expenses                                     126,084
                                                    ----------
        Total liabilities                                          3,426,100
                                                                ------------
NET ASSETS for 80,629,830 shares of beneficial
  interest outstanding                                          $808,778,825
                                                                ============
SOURCES OF NET ASSETS:
  Paid-in capital                                               $811,020,583
  Accumulated undistributed net realized gain
    (loss) on investment transactions
    (computed on the basis of identified cost)                     2,155,850
  Unrealized depreciation of investments (computed
    on the basis of identified cost)                              (4,437,335)
  Undistributed net investment income                                 39,727
                                                                ------------
        Total                                                   $808,778,825
                                                                ============
NET ASSET VALUE PER SHARE (NOTE 6)
  ($808,778,825 / 80,629,830 shares of beneficial
    interest)                                                      $10.03
                                                                   ======

                       See notes to financial statements

<PAGE>

                           STATEMENT OF OPERATIONS
--------------------------------------------------------------------------------
              For the six months ended June 30, 1995 (Unaudited)
------------------------------------------------------------------------------
INVESTMENT INCOME (NOTE 1B):
  Interest income                                                 $ 8,328,788
  Facility fees earned                                                455,096
  Income allocated from Portfolio                                  23,555,684
  Expenses allocated from Portfolio                                (2,969,671)
                                                                  -----------
        Total income                                              $29,369,897
  Expenses --
    Investment advisory fee (Note 4)                $   877,603
    Administration fee (Note 4)                         846,202
    Compensation of Trustees not members of the
      Investment Adviser's/Administrator's 
        organization                                     10,384
    Custodian fee (Note 4)                               74,119
    Interest expense                                    273,901
    Legal and accounting services                       256,626
    Transfer and dividend disbursing agent fees         132,170
    Printing and postage                                 56,029
    Registration costs                                   41,688
    Miscellaneous                                       389,374
                                                    -----------
        Total expenses                                              2,958,096
                                                                  -----------
          Net investment income                                   $26,411,801
REALIZED AND UNREALIZED GAIN (LOSS) ON
INVESTMENTS:
  Net realized gain (loss) --
    From investment transactions, computed on the
      basis of identified cost                      $ 6,993,137
    From investment transactions allocated from
      Portfolio, computed on the basis of
      identified cost                                 1,055,997
                                                    -----------
        Net realized gain                           $ 8,049,134
  Change in unrealized appreciation of investments   (7,406,535)
                                                    -----------
        Net realized and unrealized gain on
          investments                                                 642,599
                                                                  -----------
          Net increase in net assets from
            operations                                            $27,054,400
                                                                  ===========

                       See notes to financial statements
<PAGE>

                           STATEMENT OF CASH FLOWS
------------------------------------------------------------------------------
              For the six months ended June 30, 1995 (Unaudited)
------------------------------------------------------------------------------
INCREASE (DECREASE) IN CASH:
CASH FLOWS FROM (FOR) OPERATING ACTIVITIES --
    Purchase of Loan Interests                                 $  (30,002,538)
    Proceeds from sales and principal repayments                   70,114,416
    Net purchases of short-term investments                       (46,908,338)
    Purchases of interests in Senior Debt Portfolio              (201,017,951)
    Withdrawal of interests in Senior Debt Portfolio               53,021,511
    Interest received                                               6,204,445
    Interest paid                                                    (373,470)
    Operating expenses paid                                        (2,815,364)
                                                               --------------
      Net cash used for operating activities                    $(151,777,289)
                                                               --------------
CASH FLOWS FROM (FOR) FINANCING ACTIVITIES --
    Proceeds from shares sold                                  $  218,599,826
    Payments for shares reacquired in tender offers               (44,106,043)
    Cash distributions paid (excluding reinvestments of
      distributions of $14,231,913)                               (11,711,145)
    Payments made upon maturity of commercial paper               (37,458,370)
    Proceeds from issuance of commercial paper                     17,055,201
                                                               --------------
      Net cash provided from financing activities              $  142,379,469
                                                               --------------
        Net decrease in cash                                   $   (9,397,820)

CASH AT BEGINNING OF PERIOD                                         9,397,820
                                                               --------------
CASH AT END OF PERIOD                                          $     --
                                                               ==============
RECONCILIATION OF NET INCREASE IN NET ASSETS FROM
  OPERATIONS TO NET CASH FROM OPERATING ACTIVITIES:
    Net increase in net assets from operations                 $   27,054,400
    Decrease in receivable for investments sold                     2,937,034
    Decrease in interest receivable                                 4,598,880
    Decrease in prepaid expenses                                      658,407
    Decrease in deferred facility fee income                       (4,243,777)
    Decrease in accrued interest expense                             (123,649)
    Decrease in payable to affiliates                                  (8,866)
    Increase in accrued expenses and other liabilities                 11,494
    Net increase in investments                                  (182,661,212)
                                                               --------------
      Net cash used for operating activities                    $(151,777,289)
                                                               ==============

                       See notes to financial statements

<PAGE>

                     STATEMENTS OF CHANGES IN NET ASSETS
--------------------------------------------------------------------------

                                          SIX MONTHS
                                             ENDED            YEAR ENDED
                                         JUNE 30, 1995       DECEMBER 31,
                                          (UNAUDITED)            1994
                                         -------------       ------------
INCREASE (DECREASE) IN NET ASSETS:
  From operations --
    Net investment income                 $ 26,411,801       $ 37,695,894
    Net realized gain on investment
      transactions and amounts
      allocated from Portfolio               8,049,134          6,890,227
    Change in unrealized appreciation
     (depreciation) of investments          (7,406,535)        (7,115,207)
                                          ------------       ------------
      Net increase in net assets
        from operations                   $ 27,054,400       $ 37,470,914
                                          ------------       ------------
  Distributions to shareholders
   (Note 2) --
    From net investment income            $(26,393,774)      $(37,695,894)
    In excess of net investment income          --               (281,944)
                                          ------------       ------------
      Total distributions to shareholders $(26,393,774)      $(37,977,838)
                                          ------------       ------------
  Transactions in shares of beneficial
    interest (Note 3) --
    Proceeds from sales of shares         $226,414,842       $ 59,869,598
    Net asset value of shares issued
      to shareholders in payment of
      distributions declared                14,231,913         18,665,751
    Cost of shares reacquired in
      tender offers                        (44,116,074)      (149,834,588)
                                          ------------       ------------
      Increase (decrease) in net
        assets from Trust share
        transactions                      $196,530,681       $(71,299,239)
                                          ------------       ------------
          Net increase (decrease) in
            net assets                    $197,191,307       $(71,806,163)
NET ASSETS:
  At beginning of period                   611,587,518        683,393,681
                                          ------------       ------------
  At end of period (including
    undistributed net investment income
    of $39,727 and $21,700, respectively) $808,778,825       $611,587,518
                                          ============       ============

                       See notes to financial statements

<PAGE>
<TABLE>

                             FINANCIAL HIGHLIGHTS
-----------------------------------------------------------------------------------------------------------------------------------
<CAPTION>
                                                          SIX MONTHS
                                                             ENDED                       YEAR ENDED DECEMBER 31,
                                                         JUNE 30, 1995  -----------------------------------------------------------
                                                          (UNAUDITED)    1994       1993         1992         1991          1990
                                                         -------------  --------   --------   ----------   ----------    ----------
<S>                                                      <C>           <C>        <C>          <C>          <C>           <C>     
PER SHARE OPERATING PERFORMANCE:
Net asset value and market value --                      $  10.02      $  10.03   $  10.02     $   9.96     $   9.97      $  10.00
 Beginning of year                                       --------      --------   --------     --------     --------      --------
Income from Investment Operations:
  Net investment income <F3>                             $ 0.3935      $ 0.5966   $ 0.4970     $ 0.5415     $ 0.7500      $ 0.9505
  Net realized and unrealized gain (loss) on investments   0.0099       (0.0059)    0.0258       0.0575      (0.0035)<F1>  (0.0305)
                                                         --------      --------   --------     --------     --------      -------- 
      Total income from investment operations            $ 0.4034      $ 0.5907   $ 0.5228     $ 0.5990     $ 0.7465      $ 0.9200
                                                         --------      --------   --------     --------     --------      -------- 
Less Distributions:
  From net investment income                             $(0.3934)     $(0.5966)  $(0.5110)    $(0.5296)    $(0.7522)     $(0.9500)
  In excess of net investment income                        --          (0.0041)      --          --           --            --
  From net realized gain on investments                     --            --          --        (0.0094)     (0.0043)        --
  In excess of net realized gain on investment
  transactions                                              --            --       (0.0018)       --           --            --
                                                         --------      --------   --------     --------     --------      -------- 
      Total distributions                                $(0.3934)     $(0.6007)  $(0.5128)    $(0.5390)    $(0.7565)     $(0.9500)
                                                         --------      --------   --------     --------     --------      -------- 
Net asset value and market value --
  End of year                                            $  10.03      $  10.02   $  10.03     $  10.02     $   9.96      $   9.97
                                                         ========      ========   ========     ========     ========      ========
TOTAL INVESTMENT RETURN<F2>                                  4.1%          6.1%       5.3%         6.2%         7.8%          9.6%
                                                         ========      ========   ========     ========     ========      ========
RATIOS(as a percentage of average daily net assets)<F4>:
  Operating expenses<F3>                                    1.68%<F8>     1.63%      1.55%        1.44%        1.37%         1.43%
  Interest expense<F3>                                      0.08%<F8><F7> 0.21%      0.22%        0.18%        0.16%         --
  Net investment income                                     7.84%<F8>     5.95%      4.98%        5.33%        7.42%         9.48%
SUPPLEMENTAL DATA:
  Net Assets, End of Year (000 omitted)                  $808,779      $611,588   $683,393   $1,011,006   $1,694,332    $2,095,692
  Portfolio Turnover <F5>                                      5%           60%        37%          26%          16%           43%
  Number of Shares Outstanding at End of Year
    (000 omitted)                                          80,630        61,040     68,165      100,877      170,032       210,285
</TABLE>

                       See notes to financial statements
<PAGE>
<TABLE>

                       FINANCIAL HIGHLIGHTS (continued)
-----------------------------------------------------------------------------------------------------------------------------------
LEVERAGE ANALYSIS:
<CAPTION>
    Borrowings from issuance              AMOUNT OF DEBT     AVERAGE DAILY BALANCE     AVERAGE WEEKLY BALANCE   AVERAGE AMOUNT OF
    of commercial paper:                  OUTSTANDING AT      OF DEBT OUTSTANDING      OF SHARES OUTSTANDING      DEBT PER SHARE
    YEAR ENDED                              END OF YEAR           DURING YEAR               DURING YEAR             DURING YEAR
    ----------                            --------------     ---------------------     ----------------------   -----------------
    <S>                                     <C>                   <C>                       <C>                       <C>
    December 31, 1991                       $   --                $34,893,000               189,758,055               $0.1839
    December 31, 1992                       $39,764,710           $37,304,000               132,343,142               $0.2819
    December 31, 1993                       $17,981,224           $24,585,000                85,859,000               $0.2863
    December 31, 1994                       $20,403,169           $10,236,000                63,465,000               $0.1613
    June 30, 1995<F6>                       $   --                $ 9,688,000                62,118,000               $0.1560
</TABLE>
[FN]
------------
<F1> The per share amount is not in accordance with the net realized and
     unrealized gain for the period because of the timing of sales of Trust
     shares and the amount of per share realized and unrealized gains and
     losses at such time.
<F2> Total investment 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
     to be reinvested at the net asset value on the payable date.
<F3> Includes the Trust's share of Senior Debt Portfolio's allocated expenses
     for the period from February 22, 1995 to June 30, 1995.
<F4> For the year ended December 31, 1991, the expenses related to the
     operation of the Trust were reduced by a reduction of the investment
     advisory fee. Had such action not been taken, the ratios would have been
     as follows:

                                                                   YEAR ENDED
                                                                  DECEMBER 31,
                                                                      1991
                                                                  ------------
    RATIOS (as a percentage of average daily net assets):
        Operating expenses                                           1.40%
        Interest expense                                             0.16%
        Net investment income                                        7.39%

<F5> Portfolio Turnover represents the rate of portfolio activity for the period
     while the Trust was making investments directly in securities. The
     portfolio turnover for the period since the Trust transferred substantially
     all of its investable assets to the Portfolio is shown in the Portfolio's
     financial statements which are included elsewhere in this report.

<F6> The Leverage Analysis is for the period January 1, 1995 to February 21,
     1995 when the Trust transferred the Commercial Paper program to the
     Portfolio.

<F7> Interest expense is for the period from January 1, 1995 to February 21,
     1995.

<F8> Computed on an annualized basis.

                       See notes to financial statements

<PAGE>

                         NOTES TO FINANCIAL STATEMENTS
                                  (UNAUDITED)

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

(1) SIGNIFICANT ACCOUNTING POLICIES
Eaton Vance Prime Rate Reserves (the Trust) is a non-diversified closed-end
management investment company. 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. On February 22, 1995, the Trust transferred
substantially all of its investable assets to the Senior Debt Portfolio (the
Portfolio) in exchange for an interest in the Portfolio. The Trust invests all
of its investable assets in interests in the Portfolio, a New York Trust,
having the same investment objective as the Trust. The value of the Trust's
investment in the Portfolio reflects the Trust's proportionate interest in the
net assets of the Portfolio (84.0% at June 30, 1995). The performance of the
Trust 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
Trust's financial statements. The following is a summary of significant
accounting policies consistently followed by the Trust in the preparation of
its financial statements. The policies are in conformity with generally
accepted accounting principles.

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

B. INCOME -- The Trust'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 Trust determined in accordance with generally accepted
accounting principles. Prior to the Trust's investment in the Portfolio, the
Trust held its investments directly. For investments held directly, interest
income from Loan Interests was recorded on the accrual basis at the then-
current interest rate while all other interest income was determined on the
basis of interest accrued, adjusted for amortization of premium or discount
when required for federal income tax purposes. Facility fees received were
recognized as income over the expected term of the loan.

C. FEDERAL TAXES -- The Trust's policy is to comply with the provisions of the
Internal Revenue Code applicable to regulated investment companies and to
distribute to shareholders all of its taxable income, including any net
realized gain on investments. Accordingly, no provision for federal income or
excise tax is necessary. At December 31, 1994, the Trust, for federal income
tax purposes, had a capital loss carryover of $5,893,284 which will reduce the
Trust's taxable income arising from future net realized gain on investments,
if any, to the extent permitted by the Internal Revenue Code, and thus will
reduce the amount of the distributions to shareholders which would otherwise
be necessary to relieve the Trust of any liability for federal income or
excise tax. Such capital loss carryovers will expire on December 31, 2001.

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

E. INTERIM FINANCIAL INFORMATION -- The interim financial statements relating
to June 30, 1995 and for the period then ended have not been audited by
independent certified public accountants, but in the opinion of the Trust's
management, reflect all adjustments, consisting only of normal recurring
adjustments, necesssary for the fair presentation of the financial statements.

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

(2) DISTRIBUTIONS TO SHAREHOLDERS
The net investment income of the Trust is determined daily, and substantially
all of the net investment income so determined is declared daily as a dividend
to shareholders of record at the time of declaration. Such daily dividends
will be paid monthly. Distributions of realized capital gains, if any, are
made at least annually. Shareholders may reinvest capital gain distributions
in additional shares of the Trust at the net asset value as of the ex-dividend
date. Distributions are paid in the form of additional shares of the Trust or,
at the election of the shareholder, in cash. The Trust 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
over-distributions for financial statement purposes only 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. The tax treatment of
distributions for the calendar year will be reported to shareholders prior to
February 1, 1996 and will be based on tax accounting methods which may differ
from amounts determined for financial statement purposes.

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

(3) SHARES OF BENEFICIAL INTEREST
The Declaration of Trust permits the Trustees to issue an unlimited number of
full and fractional shares of beneficial interest (without par value). The
Trust may from time to time, at its discretion, make tender offers at net
asset value for the purchase of all or a portion of its shares. The price will
be established at the close of business on the last day the tender offer is
open. (An early withdrawal charge will be imposed on most shares accepted for
tender which have been held less than four years.) (See Note 6.) The Trustees
approved tender offers for the periods from January 23, 1995 to February 17,
1995; from April 24, 1995 to May 19, 1995, and from July 24, 1995 to August
18, 1995. Transactions in Trust shares were as follows:

                               SIX MONTHS            YEAR
                                  ENDED             ENDED
                              JUNE 30, 1995      DECEMBER 31,
                               (UNAUDITED)           1994
                              -------------      ------------
Sales                           22,567,021         5,996,851
Issued to shareholders
  electing to receive
  payments of distributions
  in Trust shares                 1,418,638         1,868,329
Reacquired in tender offers      (4,395,886)      (14,990,693)
                                   --------         ---------
    Net increase (decrease)      19,589,773        (7,125,513)
                                 ==========        ========== 

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

(4) INVESTMENT ADVISER FEE AND OTHER TRANSACTIONS WITH AFFILIATES
Prior to February 22, 1995 (when the Trust transferred substantially all of
its investable assets to the Portfolio in exchange for an interest in the
Portfolio), the Trust retained Eaton Vance Management (EVM) as its investment
adviser. The investment adviser fee was earned by EVM as compensation for
management and investment advisory services rendered to the Trust. The fee was
computed at the monthly rate of 19/240 of 1% (0.95% per annum) of the Trust's
average daily gross assets up to and including $1 billion and at reduced rates
as daily gross assets exceed that level. For the period from January 1, 1995
to February 21, 1995, the effective annual rate, based on average daily gross
assets, was 0.95% (annualized). An administration fee, computed at the monthly
rate of 1/48 of 1% (0.25% per annum) of the average daily gross assets of the
Portfolio attributable to the Trust, is also paid to EVM for managing and
administering business affairs of the Trust. 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
Trust and the Portfolio who are not members of EVM's or BMR's organization,
officers and Trustees receive remuneration for their services to the Trust out
of such investment adviser fee. Investors Bank & Trust Company (IBT), an
affiliate of EVM, serves as custodian of the Trust and the Portfolio. Pursuant
to the respective custodian agreements, IBT receives a fee reduced by credits
which are determined based on the average cash balances the Trust or the
Portfolio maintains with IBT. Certain of the officers and Trustees of the
Trust and Portfolio are officers and directors/trustees of the above
organizations (Note 5).
------------------------------------------------------------------------------

(5) EARLY WITHDRAWAL CHARGE
Eaton Vance Distributors, Inc. (EVD), a subsidiary of EVM, serves as the
Trust's principal underwriter. EVD compensates authorized dealers for sales
commissions at a rate of 3% of the purchase price of shares purchased through
such dealers. EVD also pays additional compensation to each dealer ranging
from 0.10% to 0.30% per annum of the value of Trust shares sold by such dealer
that are outstanding for specified periods of time. An early withdrawal charge
to recover distribution expenses will be charged to redeeming shareholders and
paid to EVD in connection with most shares held for less than four years which
are accepted by the Trust for repurchase pursuant to tender offers. The early
withdrawal charge is imposed at declining rates that begin at 3% in the case
of redemptions in the first year after purchase, declining to 2.5%, 2%, 1% and
0% in the second, third and fourth year and thereafter, respectively. The
early withdrawal charge will be imposed on those shares accepted for tender,
the value of which exceeds the aggregate value at the time the tender is
accepted of: (a) all shares in the account purchased more than four years
prior to such acceptance, (b) all shares in the account acquired through
reinvestment of distributions, and (c) the increase, if any, in value of all
other shares in the account (namely those purchased within the four years
preceding the acceptance) over the purchase price of such shares. In
determining whether an early withdrawal charge is payable, it is assumed that
the acceptance of a repurchase offer is made from the earliest purchase of
shares. The total early withdrawal charges received by EVD for the six months
ended June 30, 1995 amounted to $104,934.

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

(6) INVESTMENT TRANSACTIONS
On February 22, 1995, the Trust transferred substantially all of its assets to
the Portfolio in exchange for an interest in the Portfolio. Increases and
decreases in the Trust's investment in the Portfolio for the period from
February 22, 1995 to June 30, 1995 aggregated $201,017,951 and $53,021,511,
respectively. The cost of purchases and the proceeds from principal repayments
and sales of Loan Interests, during the period from January 1, 1995 to February
21, 1995, aggregated $30,002,538 and $67,177,382, respectively.

<PAGE>

                             SENIOR DEBT PORTFOLIO
                            PORTFOLIO OF INVESTMENTS
                                 JUNE 30, 1995
                      (EXPRESSED IN UNITED STATES DOLLARS)
--------------------------------------------------------------------------------
               SENIOR, SECURED, FLOATING-RATE INTERESTS - 88.2%
--------------------------------------------------------------------------------
PRINCIPAL
AMOUNT               BORROWER/BUSINESS DESCRIPTION                    VALUE
--------------------------------------------------------------------------------
                AEROSPACE/DEFENSE - 2.3%                                     
                TRACOR, INC.                                                 
$ 1,596,609        Term loan, maturing October 31, 1998          $  1,596,609
  9,950,000        Term loan, maturing February 28, 2001            9,950,000
                   Technical services to defense companies                   
                                                                             
                VSI INDUSTRIES, INC.                                         
 10,502,130        Term loan, maturing March 31, 1997              10,502,130
                   Aerospace and specialty fasteners, and                    
                   plastics industry tooling systems                         
                                                                 ------------
                                                                 $ 22,048,739
                                                                 ------------
                AIRLINES - 3.3%                                              
                NORTHWEST AIRLINES CORPORATION                               
$12,443,942        Term loan, maturing December 15, 1998         $ 12,443,942
 13,949,160        Term loan, maturing December 15, 1999           13,949,160
  5,303,423        Term loan, maturing December 15, 2000            5,303,423
                   Passenger airline carrier                                 
                                                                 ------------
                                                                 $ 31,696,525
                                                                 ------------
                AUTO PARTS - 1.3%                                            
                EXIDE CORPORATION                                            
$ 4,987,437        Term loan, maturing September 30, 2001        $  4,987,437
                   Automobile batteries                                      
                                                                             
                STANADYNE AUTOMOTIVE CORP.                                   
  7,500,000        Term loan, maturing December 31, 2001            7,500,000
                   Auto and light truck fuel injection                       
                   equipment                                                 
                                                                 ------------
                                                                 $ 12,487,437
                                                                 ------------
                BROADCAST MEDIA - 4.4%                                       
                CLASSIC CABLE, INC.                                          
$ 4,000,000        Term loan, maturing March 31, 2003            $  4,000,000
  7,000,000        Term loan, maturing March 31, 2004               7,000,000
                   Cable television provider                                 
                                                                             
                COAXIAL COMMUNICATIONS, INC.                                 
  9,966,667        Term loan, maturing December 31, 1999            9,966,667
                   Midwest cable television provider                         
                                                                             
                ELLIS COMMUNICATIONS, INC.                                   
 10,365,333        Term loan, maturing March 31, 2003              10,365,333
                   Broadcast television operator                             
                                                                             
                NORTHLAND CABLE TELEVISION, INC.                             
  7,500,000        Term loan, maturing March 31, 2002               7,500,000
  3,500,000        Term loan, maturing September 30, 2003           3,500,000
                   Cable television provider                                 
                                                                 ------------
                                                                 $ 42,332,000
                                                                 ------------
                CHEMICALS - 3.0%                                             
                FREEDOM CHEMICAL COMPANY                                     
$13,200,000        Term loan, maturing June 30, 2002             $ 13,200,000
                   Organic dyes, pigments, textile chemicals,                
                   and other specialty chemicals                             
                                                                             
                HARRIS SPECIALTY CHEMICALS, INC.                             
  1,531,067        Term loan, maturing December 31, 1999            1,531,067
  5,702,847        Term loan, maturing December 31, 2001            5,702,847
                   Construction chemicals                                    
                                                                             
                INDSPEC CHEMICAL CORP.                                       
  8,622,653        Term loan, maturing December 2, 2000             8,622,653
                   Resorcinol and other specialty chemical                   
                   products                                                  
                                                                 ------------
                                                                 $ 29,056,567
                                                                 ------------
                COMMERCIAL SERVICES - 3.8%                                   
                AVIALL, INC.                                                 
$ 5,000,000        Term loan, maturing November 30, 2000         $  5,000,000
                   Turbine engine repair and parts                           
                   distribution                                              
                                                                             
                HOSIERY CORP. OF AMERICA                                     
  3,433,544        Term loan, maturing October 17, 1999             3,433,544
  4,937,500        Term loan, maturing July 31, 2001                4,937,500
                   Women's hosiery                                           
                                                                             
                IRON MOUNTAIN INFORMATION SERVICES                           
  4,488,750        Term loan, maturing October 31, 2002             4,488,750
                   Document archive services                                 
                                                                             
                PSI ACQUISITION CORPORATION                                  
  3,149,177        Term loan, maturing December 31, 1998            3,149,177
  5,000,000        Term loan, maturing December 31, 2000            5,000,000
                   Diversified consulting services                           
                                                                             
                SELECT BEVERAGES, INC.                                       
  4,000,000        Term loan, maturing June 30, 2001                4,000,000
  6,000,000        Term loan, maturing June 30, 2002                6,000,000
                   Soft drink bottler                                        
                                                                 ------------
                                                                 $ 36,008,971
                                                                 ------------
                CONGLOMERATES - 1.3%                                         
                SPALDING & EVENFLO COMPANIES, INC.                           
$12,395,833        Term loan, maturing October 13, 2002          $ 12,395,833
                   Sporting goods and infant products            ------------
                                                                             
                CONTAINERS - METAL & GLASS - 0.8%                            
                SILGAN CORP.                                                 
$ 7,480,213        Term loan, maturing September 15, 1996        $  7,480,213
                   Metal and plastic packaging products          ------------
                                                                             
                                                                             
                CONTAINERS - PAPER - 9.5%                                    
                IVEX PACKAGING CORP.                                         
$ 9,631,266        Term loan, maturing December 31, 1999         $  9,631,266
                   Plastic and paper packaging products                      
                                                                             
                JEFFERSON SMURFIT CORP.                                      
 19,107,296        Term loan, maturing April 30, 2001              19,107,296
 22,120,676        Term loan, maturing April 30, 2002              22,120,676
                   Liner board and other paper board product                 
                                                                             
                STONE CONTAINER CORP.                                        
 39,885,000        Term loan, maturing April 1, 2000               39,885,000
                   Commodity pulp, paper and packaging                     
                   products                                                
                                                                 ------------
                                                                 $ 90,744,238
                                                                 ------------
                COSMETICS - 0.8%                                             
                MARY KAY COSMETICS, INC.                                     
$ 7,500,000        Term loan, maturing June 6, 2001              $  7,500,000
                   Cosmetics, skin and hair care, and perfume                
                   products                                                  
                                                                             
                ELECTRONICS - INSTRUMENTATION - 3.3%                         
                BERG ELECTRONICS, INC.                                       
$11,850,000        Term loan, maturing March 31, 2001            $ 11,850,000
                   Electronic connectors                                     
                                                                             
                ELSAG BAILEY, INC                                            
 12,891,667        Term loan, maturing June 25, 2002               12,891,667
                   Electronic process control systems                        
                                                                             
                SPERRY MARINE, INC.                                          
  6,541,487        Term loan, maturing December 31, 2000            6,541,487
                   Marine navigational equipment                             
                                                                 ------------
                                                                 $ 31,283,154
                                                                 ------------
                FOOD WHOLESALERS - 3.4%                                      
                CATERAIR HOLDINGS CORP.                                      
$12,496,766        Term loan, maturing December 31, 1996         $ 12,496,766
                   Food service to airlines                                  
                                                                             
                KRAFT FOODSERVICE, INC.                                      
  5,000,000        Term loan, maturing March 31, 2002               5,000,000
                   Food producer and distributor                             
                                                                             
                U.S. FOODSERVICE, INC.                                       
 14,679,787        Term loan, maturing June 30, 2000               14,679,787
                   Food distributor to business                              
                                                                 ------------
                                                                 $ 32,176,553
                                                                 ------------
                FOODS - 2.3%                                                 
                SPECIALTY FOODS CORP.                                        
$21,774,760        Term loan, maturing August 31, 1999           $ 21,774,760
                   Bread and cheese products                     ------------
                                                                             
                LEISURE - 1.4%                                               
                SIX FLAGS THEME PARKS, INC.                                  
$12,950,000        Term loan, maturing June 23, 2003             $ 12,950,000
                   Amusement parks                               ------------
                                                                             
                MANUFACTURING - DIVERSIFIED - 6.2%                           
                INTERLAKE CORP.                                              
$ 8,235,788        Term loan, maturing September 27, 1996        $  8,235,788
                   Engineered materials                                      
                                                                             
                INTERMETRO INDUSTRIES CORP.                                  
  3,569,044        Term loan, maturing June 30, 2001                3,569,044
  5,113,939        Term loan, maturing December 31, 2002            5,113,939
                   Shelving                                                  
                                                                             
                INTERNATIONAL WIRE GROUP, INC.                               
 10,000,000        Term loan, maturing September 30, 2002          10,000,000
                   Manufactures and markets copper wire and                  
                   harnesses                                                 
                                                                             
                INTESYS TECHNOLOGIES, INC.                                   
  5,000,000        Term loan, maturing December 31, 2001            5,000,000
                   Plastic injection molding and fabricated                  
                   battery packs                                             
                                                                             
                MOSLER, INC.                                                 
  1,817,964        Term loan, maturing June 1, 1998                 1,817,964
                   Safes, vaults, electronic security systems                
                                                                             
                THERMADYNE HOLDINGS CORP.                                    
 14,459,063        Term loan, maturing February 1, 2001            14,459,063
                   Cutting and welding products and floor                   
                   cleaning equipment                                       
                                                                             
                WATERS CORP.                                                 
  6,218,750        Term loan, maturing November 30, 2001            6,218,750
  4,353,125        Term loan, maturing November 30, 2002            4,353,125
                   Manufacturer of high performance liquid                   
                   chromatography instruments                                
                                                                 ------------
                                                                 $ 58,767,673
                                                                 ------------
                PAPER AND FOREST PRODUCTS - 7.3%                             
                FORT HOWARD CORP.                                            
$15,000,000        Term loan, maturing March 8, 2002             $ 15,000,000
 15,000,000        Term loan, maturing December 31, 2002           15,000,000
                   Sanitary tissue paper products                            
                                                                             
                SDW ACQUISITION CORP.                                        
 40,000,000        Term loan, maturing December 20, 2002           40,000,000
                   Major U.S. producer of coated free paper                  
                                                                 ------------
                                                                 $ 70,000,000
                                                                 ------------
                PUBLISHING - 4.7%                                            
                KRUEGER RINGIER, INC.                                        
$ 9,052,569        Term loan, maturing December 31, 1997         $  9,052,569
  6,096,786        Term loan, maturing December 31, 1998            6,096,786
                   Printers and binders of mass market and                   
                   hardcover books                                           
                                                                             
                ZIFF-DAVIS PUBLISHING COMPANY                                
 15,367,647        Term loan, maturing December 31, 2001           15,367,647
 14,632,353        Term loan, maturing December 31, 2002           14,632,353
                   Computer publications publisher                           
                                                                 ------------
                                                                 $ 45,149,355
                                                                 ------------
                PUBLISHING - NEWSPAPERS - 2.6%                               
                AMERICAN MEDIA OPERATIONS, INC.                              
$ 4,477,500        Term loan, maturing September 30, 2002        $  4,477,500
                   Weekly periodical publisher                               
                                                                             
                JOURNAL NEWS, INC.                                           
 20,000,000        Term loan, maturing December 31, 2001           20,000,000
                   Suburban newspaper                                        
                                                                 ------------
                                                                 $ 24,477,500
                                                                 ------------
                RESTAURANTS - 4.0%                                           
                AMERICA'S FAVORITE CHICKEN COMPANY                           
$21,906,050        Term loan, maturing November 5, 1998          $ 21,906,050
                   Church's Fried Chicken and Popeye's                       
                    restaurants                                              
                                                                             
                 LONG JOHN SILVER'S RESTAURANTS, INC.                        
 16,718,464        Term loan, maturing December 31, 1996           16,718,464
                   Fish restaurants                                          
                                                                 ------------
                                                                 $ 38,624,514
                                                                 ------------
                RETAIL - SPECIALTY - 3.2%                                    
                CAMELOT MUSIC, INC.                                          
$ 4,987,186        Term loan, maturing February 28, 2001         $  4,987,186
                   Music stores                                              
                                                                             
                GRIFFITH CONSUMERS COMPANY                                   
 10,847,222        Term loan, maturing December 31, 2002           10,847,222
                   Retail petroleum distributor                              
                                                                             
                QVC, INC.                                                    
 15,000,000        Term loan, maturing January 31, 2004            15,000,000
                   Home shopping retailer                                    
                                                                 ------------
                                                                 $ 30,834,408
                                                                 ------------
                RETAIL STORES - DRUG STORES - 1.7%                           
                DUANE READE, INC.                                            
$ 5,016,667        Term loan, maturing December 31, 1997         $  5,016,667
                   Retail drug stores                                        
                                                                             
                THRIFTY PAYLESS, INC.                                        
 11,562,509        Term loan, maturing March 31, 2000              11,562,509
                   Retail drug stores                                        
                                                                 ------------
                                                                 $ 16,579,176
                                                                 ------------
                RETAIL STORES - FOOD CHAINS - 12.5%                          
                DOMINICK'S FINER FOODS, INC.                                 
$ 3,325,574        Term loan, maturing March 31, 2002            $  3,325,574
  8,255,854        Term loan, maturing March 31, 2003               8,255,854
  9,255,854        Term loan, maturing September 30, 2003           9,255,854
                   Supermarket chain in Chicago                              
                                                                             
                GRAND UNION COMPANY                                          
 26,628,890        Term loan, maturing June 15, 2002               26,628,890
                   Supermarket chain in the Northeast                        
                                                                             
                PATHMARK STORES, INC.                                        
 34,650,000        Term loan, maturing October 31, 1999            34,650,000
                   Supermarket chain in mid-Atlantic states                  
                                                                             
                RALPHS GROCERY COMPANY                                       
  7,666,667        Term loan, maturing June 15, 2002                7,666,667
  7,666,667        Term loan, maturing June 15, 2003                7,666,667
  7,666,667        Term loan, maturing June 15, 2004                7,666,667
                   Third largest supermarket chain in Southern               
                     California                                              
                                                                             
                STAR MARKET COMPANY, INC.                                    
 10,105,263        Term loan, maturing December 31, 2001           10,105,263
  4,421,053        Term loan, maturing December 31, 2002            4,421,053
                   Supermarket chain in Massachusetts                        
                                                                 ------------
                                                                 $119,642,489
                                                                 ------------
                STEEL - 1.3%                                                 
                UCAR INTERNATIONAL, INC.                                     
$ 6,090,848        Term loan, maturing January 31, 2003          $  6,090,848
  3,201,600        Term loan, maturing July 31, 2003                3,201,600
  3,201,600        Term loan, maturing January 31, 2004             3,201,600
                   Processing materials for steel industry                   
                                                                 ------------
                                                                 $ 12,494,048
                                                                 ------------
                TELECOMMUNICATIONS - 1.6%                                    
                PAGING NETWORK, INC.                                         
$15,000,000        Term loan, maturing March 31, 2002            $ 15,000,000
                   Paging service provider                       ------------
                                                                             
                TEXTILES - 2.2%                                              
                BLACKSTONE CAPITAL COMPANY II, L.L.C.                        
$ 5,000,000        Term loan, maturing January 13, 1997          $  5,000,000
                   Automotive products, residential upholstery               
                     fabrics, and wallcoverings                              
                                                                             
                LONDON FOG INDUSTRIES, INC.                                  
  9,582,314        Term loan, maturing May 31, 2002                 8,911,552
  1,971,219        Term loan, maturing May 31, 2002 *               1,655,824
                   Outerwear                                                 
                                                                             
                WASSERSTEIN/C & A HOLDINGS, L.L.C.                           
  5,000,000        Term loan, maturing January 13, 1997             5,000,000
                   Automotive products, residential upholstery               
                     fabrics, and wallcoverings                              
                                                                 ------------
                                                                 $ 20,567,376
                                                                 ------------
                 TOTAL LOAN INTERESTS (IDENTIFIED COST,                      
                   $843,764,660)                                 $842,071,529
                                                                 ------------
--------------------------------------------------------------------------------
                       PREFERRED STOCKS - 0.8%
--------------------------------------------------------------------------------
SHARES                SECURITY                                       VALUE
--------------------------------------------------------------------------------
     54,895      America's Favorite Chicken Company, 8%          $  4,035,880
                   Preferred Stock                                           
  5,845,956      London Fog Industries, Inc., 17.5% Preferred                
                   Stock*                                           3,178,220
                                                                 ------------
                 TOTAL PREFERRED STOCKS (IDENTIFIED COST,                    
                   $10,014,473)                                  $  7,214,100
                                                                 ------------


--------------------------------------------------------------------------------
                         SHORT-TERM INVESTMENTS - 10.5%
--------------------------------------------------------------------------------
PRINCIPAL
AMOUNT                DESCRIPTION
--------------------------------------------------------------------------------
$23,000,000      CXC,Inc., 6.25%, 7/3/95                         $ 22,992,014
 39,347,000      Corporate Receivables Corp., 6.20%, 7/3/95        39,333,447
  2,824,000      Melville Corp., 6.23%, 7/3/95                      2,823,023
 35,373,000      Prudential Funding Corp., 5.97%, 7/6/95           35,343,670
                                                                 ------------
                 TOTAL SHORT-TERM INVESTMENTS, AT AMORTIZED                  
                   COST                                          $100,492,154
                                                                 ------------
                 TOTAL INVESTMENTS (IDENTIFIED COST,                         
                   $954,271,287) - 99.5%                         $949,777,783
                 OTHER ASSETS, LESS LIABILITIES - 0.5%              4,809,543
                                                                 ------------
                 TOTAL NET ASSETS - 100%                         $954,587,326
                                                                 ============

*Non-income producing security.
Note: The description of the principal business for each security set forth
above is unaudited.

                       See notes to financial statements
<PAGE>
                             SENIOR DEBT PORTFOLIO
                              FINANCIAL STATEMENTS
                      STATEMENT OF ASSETS AND LIABILITIES
--------------------------------------------------------------------------------
                                 June 30, 1995
                      (Expressed in United States Dollars)
--------------------------------------------------------------------------------
ASSETS:
  Investments, at value (Note 1A) (identified cost,
    $954,271,287)                                               $949,777,783
  Cash                                                             3,184,749
  Receivable for investments sold                                    398,047
  Interest receivable                                              5,371,248
  Deferred organization expenses (Note 1D)                            38,948
  Prepaid expenses                                                   798,758
                                                                ------------
      Total assets                                              $959,569,533
LIABILITIES:
  Deferred facility fee income (Note 1B)            $4,869,498
  Payable to affiliate -- Custodian fee                  8,907
  Accrued expenses                                     103,802
                                                    ----------
      Total liabilities                                            4,982,207
                                                                ------------
NET ASSETS applicable to investors' interest in Portfolio       $954,587,326
                                                                ============
SOURCES OF NET ASSETS:
  Net proceeds from capital contributions and withdrawals       $959,080,830
  Unrealized depreciation of investments (computed
    on the basis of identified cost)                              (4,493,504)
                                                                ------------
      Total                                                     $954,587,326
                                                                ============
                 See notes to financial statements
<PAGE>


                            STATEMENT OF OPERATIONS
--------------------------------------------------------------------------------
For the period from the start of business, February 22, 1995, to June 30, 1995
                      (Expressed in United States Dollars)
--------------------------------------------------------------------------------
INVESTMENT INCOME (NOTE 1B):
  Interest income                                                 $24,104,032
  Facility fees earned                                              1,323,580
                                                                  -----------
      Total income                                                $25,427,612
  Expenses --
    Investment adviser fee (Note 2)                  $2,523,771
    Custodian fee (Note 2)                              105,144
    Interest expense                                    373,538
    Legal and accounting services                        14,716
    Amortization of organization expenses (Note 1D)       2,282
    Miscellaneous                                       182,242
                                                     ----------
        Total expenses                                              3,201,693
                                                                  -----------
          Net investment income                                   $22,225,919

REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS:
  Net realized gain on investment transactions       $1,095,155
  Change in unrealized depreciation of investments   (1,768,577)
                                                     ----------
        Net realized and unrealized loss on
          investments                                                (673,422)
                                                                  -----------
          Net increase in net assets from operations              $21,552,497
                                                                  ===========
                 See notes to financial statements
<PAGE>

                          STATEMENT OF CASH FLOWS
--------------------------------------------------------------------------------
For the period from the start of business, February 22, 1995, to June 30, 1995
                      (Expressed in United States Dollars)
--------------------------------------------------------------------------------
INCREASE (DECREASE) IN CASH:
CASH FLOWS FROM (FOR) OPERATING ACTIVITIES --
    Purchase of Loan Interests and investments                  $(401,348,374)
    Proceeds from sales and principal repayments                  134,261,432
    Interest received                                              25,307,620
    Facility fees received                                          2,569,699
    Interest paid                                                    (284,791)
    Operating expenses paid                                        (2,738,970)
    Net increase in short-term investments                        (53,583,815)
                                                                -------------
      Net cash used for operating activities                    $(295,817,199)
                                                                -------------
CASH FLOWS FROM (FOR) FINANCING ACTIVITIES --
    Proceeds from capital contributions                         $ 353,435,714
    Payments for capital withdrawals                              (54,633,766)
                                                                -------------
      Net cash provided by financing activities                 $ 298,801,948
                                                                -------------
        Net increase in cash                                    $   2,984,749
CASH AT BEGINNING OF PERIOD                                           200,000
                                                                -------------
CASH AT END OF PERIOD                                           $   3,184,749
                                                                =============
RECONCILIATION OF NET INCREASE IN NET ASSETS FROM
  OPERATIONS TO NET CASH USED FOR OPERATING ACTIVITIES:
    Net increase in net assets from operations                  $  21,552,497
    Increase in receivable for investments sold                      (245,089)
    Decrease in interest receivable                                 1,504,933
    Increase in prepaid expenses                                     (219,142)
    Increase in deferred organization expenses                        (38,948)
    Increase in deferred facility fee income                        1,164,165
    Increase in payable to affiliate -- custodian fee                   8,907
    Increase in accrued expenses                                       84,403
    Net increase in investments                                  (319,628,925)
                                                                -------------
      Net cash used for operating activities                    $(295,817,199)
                                                                ============= 
                 See notes to financial statements
<PAGE>
                       STATEMENT OF CHANGES IN NET ASSETS
--------------------------------------------------------------------------------
 For the period from the start of business, February 22, 1995, to June 30, 1995
                      (Expressed in United States Dollars)
--------------------------------------------------------------------------------
INCREASE (DECREASE) IN NET ASSETS:
  From operations --
    Net investment income                                       $  22,225,919
    Net realized gain on investment transactions                    1,095,155
    Change in unrealized depreciation of investments               (1,768,577)
                                                                -------------
      Net increase in net assets from operations                $  21,552,497
                                                                -------------
  Capital transactions --
    Contributions                                                $987,468,595
    Withdrawals                                                   (54,633,766)
                                                                -------------
      Increase in net assets resulting from capital
       transactions                                              $932,834,829
                                                                -------------
        Total increase in net assets                             $954,387,326

NET ASSETS:
  At beginning of period                                              200,000
                                                                -------------
  At end of period                                               $954,587,326
                                                                 ============
--------------------------------------------------------------------------------
                               SUPPLEMENTARY DATA
--------------------------------------------------------------------------------
                   For the period from the start of business,
                      February 22, 1995, to June 30, 1995
--------------------------------------------------------------------------------
RATIOS (As a percentage of average daily net assets):
  Operating expenses                                                  1.06%+
  Interest expense                                                    0.14%+
  Net investment income                                               8.35%+
PORTFOLIO TURNOVER                                                      21%

+Annualized.


                       See notes to financial statements
<PAGE>
                         NOTES TO FINANCIAL STATEMENTS

(1) SIGNIFICANT ACCOUNTING POLICIES
Senior Debt Portfolio (the Portfolio) is registered under the Investment Company
Act of 1940 as a non-diversified closed-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 interests in the Portfolio.
Investment operations began on February 22, 1995, with the acquisition of
securities with a value of $583,240,521, including unrealized depreciation of
$2,724,927, in exchange for an interest in the Portfolio by one of the
Portfolio's investors. The following is a summary of significant accounting
policies of the Portfolio. The policies are in conformity with accounting
principles generally accepted in the United States of America.

A. INVESTMENT VALUATION -- The Portfolio's investments in interests in loans
(Loan Interests) are valued at fair value by the Portfolio's investment adviser,
Boston Management and Research, under procedures established by the Trustees as
permitted by Section 2(a)(41) of the Investment Company Act of 1940. Such
procedures include the consideration of relevant factors, data and information
relating to fair value, including (i) the characteristics of and fundamental
analytical data relating to the Loan Interest, including the cost, size, current
interest rate, period until next interest rate reset, maturity and base lending
rate of the Loan Interest, the terms and conditions of the loan and any related
agreements and the position of the loan in the borrower's debt structure; (ii)
the nature, adequacy and value of the collateral, including the Portfolio's
rights, remedies and interests with respect to the collateral; (iii) the
creditworthiness of the borrower, based on evaluations of its financial
condition, financial statements and information about the borrower's business,
cash flows, capital structure and future prospects; (iv) information relating to
the market for the Loan Interest including price quotations for and trading in
the Loan Interest and interests in similar loans and the market environment and
investor attitudes towards the Loan Interest and interests in similar loans; (v)
the reputation and financial condition of the agent bank and any intermediate
participant in the loan; and (vi) general economic and market conditions
affecting the fair value of the Loan Interest. Other portfolio securities (other
than short-term obligations, but including listed issues) may be valued on the
basis of prices furnished by one or more pricing services which determine prices
for normal, institutional-sized trading units of such securities using market
information, transactions for comparable securities and various relationships
between securities which are generally recognized by institutional traders. In
certain circumstances, portfolio securities will be valued at the last sales
price on the exchange that is the primary market for such securities, or the
last quoted bid price for those securities for which the over-the-counter market
is the primary market or for listed securities in which there were no sales
during the day. The value of interest rate swaps will be determined in
accordance with a discounted present value formula and then confirmed by
obtaining a bank quotation. Short-term obligations which mature in sixty days or
less are valued at amortized cost, if their original term to maturity when
acquired by the Portfolio was 60 days or less, or are valued at amortized cost
using their value on the 61st day prior to maturity, if their original term to
maturity when acquired by the Portfolio was more than 60 days, unless in each
case this is determined not to represent fair value. Repurchase agreements are
valued at cost plus accrued interest. Other portfolio securities for which there
are no quotations or valuations are valued at fair value as determined in good
faith by or on behalf of the Trustees.

B. INCOME -- Interest income from Loan Interests is recorded on the accrual
basis at the then-current interest rate, while all other interest income is
determined on the basis of interest accrued, adjusted for amortization of
premium or discount when required for federal income tax purposes. Facility fees
received are recognized as income over the expected term of the loan.

C. 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 investor's
distributive share of the Portfolio's net investment income, net realized
capital gains, and any other items of income, gain, loss, deductions or credit.

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.
--------------------------------------------------------------------------------
(2) INVESTMENT ADVISORY FEES AND OTHER TRANSACTIONS WITH AFFILIATES
The investment advisory fee is earned by Boston Management and Research (BMR) as
compensation for investment advisory services rendered to the Portfolio. The fee
is computed at the monthly rate of 19/240 of 1% (0.95% per annum) of the
Portfolio's average daily gross assets up to and including $1 billion and at
reduced rates as daily gross assets exceed that level. For the period from the
start of business, February 22, 1995, to June 30, 1995, the effective annual
rate, based on average daily gross assets, was 0.95% (annualized) and amounted
to $2,523,771. Except as to Trustees of the Portfolio who are not members of
BMR's organization, officers and Trustees receive remuneration for their
services to the Portfolio out of such investment advisory fee. Investors Bank &
Trust Company (IBT), an affiliate of BMR, serves as custodian of the Portfolio.
Pursuant to the custodian agreement, IBT receives a fee reduced by credits which
are determined based on average daily cash balances the Portfolio maintains with
IBT. 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 Advisor 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 period from the start of business,
February 22, 1995, to June 30, 1995, no significant amounts have been deferred.
--------------------------------------------------------------------------------
(3) INVESTMENTS
The Portfolio invests primarily in Loan Interests. The ability of the issuers of
the Loan Interests to meet their obligations may be affected by economic
developments in a specific industry. The cost of purchases and the proceeds from
principal repayments and sales of Loan Interests for the period from the start
of business, February 22, 1995, to June 30, 1995, aggregated $401,348,374 and
$134,506,521, respectively.
--------------------------------------------------------------------------------
(4) SHORT-TERM DEBT AND CREDIT AGREEMENTS
The Portfolio participates with other funds and portfolios managed by BMR and
Eaton Vance Management (EVM) in a $120 million unsecured line of credit
agreement with a bank. The line of credit consists of a $20 million committed
facility and a $100 million discretionary facility. Borrowings will be made by
the Portfolio solely to facilitate the handling of unusual and/or unanticipated
short-term cash requirements. Interest is charged to each portfolio based on its
borrowings at an amount above either the bank's adjusted certificate of deposit
rate, a variable adjusted certificate of deposit rate, or a federal funds
effective rate. In addition, a fee computed at an annual rate of 1/4 of 1% on
the $20 million committed facility and on the daily unused portion of the $100
million discretionary facility is allocated among the participating funds and
portfolios at the end of each quarter. The Portfolio did not have any
significant borrowings or allocated fees under this agreement during the period.
The Portfolio has also entered into a revolving credit agreement, that will
allow the Portfolio to borrow an additional $245 million to support the issuance
of commercial paper and to permit the Portfolio to invest in accordance with its
investment practices. Interest is charged under the revolving credit agreement
at the bank's base rate or at an amount above either the bank's adjusted Libor
rate or adjusted certificate of deposit rate. Interest expense includes a
commitment fee of approximately $210,512 which is computed at the annual rate of
1/4 of 1% on the unused portion of the revolving credit agreement. There were no
borrowings under this agreement during the period. As of June 30, 1995, the
Portfolio had no commercial paper outstanding.
------------------------------------------------------------------------------
(5) FEDERAL INCOME TAX BASIS OF INVESTMENT SECURITIES
The cost and unrealized appreciation/depreciation in the value of investments
owned at June 30, 1995, as computed on a federal income tax basis, were as
follows:

     Aggregate cost                                              $954,271,287
                                                                 ============
     Gross unrealized depreciation                               $  4,493,504
     Gross unrealized appreciation                                    --
                                                                  -----------
     Net unrealized depreciation                                 $  4,493,504
                                                                 ============
<PAGE>

                          INDEPENDENT AUDITORS' REPORT
--------------------------------------------------------------------------------
To the Trustees and Investors of
Senior Debt Portfolio:

We have audited the accompanying statement of assets and liabilities, including
the portfolio of investments, of Senior Debt Portfolio as of June 30, 1995, and
the related statement of operations, the statement of cash flows, the statement
of changes in net assets and the supplementary data for the period from the
start of business, February 22, 1995, to June 30, 1995 (all expressed in United
States dollars). 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
audit.

We conducted our audit in accordance with auditing standards generally accepted
in the United States of America. Those standards require that we plan and
perform the audit 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 and Loan Interests owned at June 30, 1995 by correspondence with the
custodian and selling or agent banks; where replies were not received from
selling or agent banks, we performed other auditing procedures. 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 audit provides a reasonable basis for our
opinion.

In our opinion, such financial statements and supplementary data present fairly,
in all material respects, the financial position of Senior Debt Portfolio as of
June 30, 1995, the results of its operations and its cash flows, the changes in
its net assets, and its supplementary data for the period from the start of
business, February 22, 1995, to June 30, 1995, in conformity with accounting
principles generally accepted in the United States of America.

As discussed in Note 1A, the financial statements include Loan Interests and
certain other securities held by Senior Debt Portfolio valued at $849,285,629
(89% of net assets of the Portfolio), which values are fair values determined by
the Portfolio's investment adviser in the absence of actual market values.
Determination of fair value involves subjective judgment, as the actual market
value of a particular Loan Interest or security can be established only by
negotiation between the parties in a sales transaction. We have reviewed the
procedures established by the Trustees and used by the Portfolio's investment
adviser in determining the fair values of such Loan Interests and securities and
have inspected underlying documentation, and in the circumstances, we believe
that the procedures are reasonable and the documentation appropriate.

                                                              DELOITTE & TOUCHE
Grand Cayman, Cayman Islands
British West Indies
August 11, 1995

<PAGE>


                            INVESTMENT MANAGEMENT

EATON VANCE             OFFICERS                   INDEPENDENT TRUSTEES
PRIME RATE              JAMES B. HAWKES            DONALD R. DWIGHT    
RESERVES                President and Trustee      President, Dwight   
24 Federal Street       M. DOZIER GARDNER          Partners, Inc.      
Boston, MA 02110        Vice President and           Chairman,         
                        Trustee                    Newspapers of       
                        JEFFREY S. GARNER          New England, Inc.   
                        Vice President             SAMUEL L. HAYES, III
                        JAMES L. O'CONNOR          Jacob H. Schiff     
                        Treasurer                  Professor of        
                        THOMAS OTIS                Investment Banking, 
                        Secretary                  Harvard             
                                                   University Graduate 
                                                   School of           
                                                   Business            
                                                   Administration      
                                                   NORTON H. REAMER    
                                                   President and       
                                                   Director, United    
                                                   Asset               
                                                   Management          
                                                   Corporation         
                                                   JOHN L. THORNDIKE   
                                                   Director, Fiduciary 
                                                   Company Incorporated
                                                   JACK L. TREYNOR     
                                                   Investment Adviser  
                                                   and Consultant      
                        -------------------------------------------------
SENIOR DEBT             OFFICERS                   INDEPENDENT TRUSTEES
PORTFOLIO               JAMES B. HAWKES            DONALD R. DWIGHT    
24 Federal Street       President and Trustee      President, Dwight   
Boston, MA 02110        M. DOZIER GARDNER          Partners, Inc.      
                        Vice President and           Chairman,         
                        Trustee                    Newspapers of       
                        JEFFREY S. GARNER          New England, Inc.   
                        Vice President and         SAMUEL L. HAYES, III
                        Portfolio Manager          Jacob H. Schiff     
                        WILLIAM CHISHOLM           Professor of        
                        Vice President             Investment Banking, 
                        RAYMOND O'NEILL            Harvard University  
                        Vice President             Graduate School of  
                        MICHEL NORMANDEAU          Business            
                        Vice President             Administration      
                        THOMAS OTIS                NORTON H. REAMER    
                        Secretary                  President and       
                        JAMES L. O'CONNOR          Director, United    
                        Treasurer                  Asset               
                                                   Management          
                                                   Corporation         
                                                   JOHN L. THORNDIKE   
                                                   Director, Fiduciary 
                                                   Company Incorporated
                                                   JACK L. TREYNOR     
                                                   Investment Adviser  
                                                   and Consultant      

<PAGE>

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


ADMINISTRATOR OF EATON VANCE
PRIME RATE RESERVES
Eaton Vance Management
24 Federal Street
Boston, MA 02110


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


CUSTODIAN
Investors Bank & Trust Company
24 Federal Street
Boston, MA 02110


TRANSFER AGENT
The Shareholder Services Group, Inc.
BOS725
P.O. Box 1559
Boston, MA 02104

BANKING COUNSEL
Mayer, Brown & Platt
787 Seventh Avenue
New York, NY 10019



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.

EATON VANCE PRIME RATE RESERVES
24 Federal Street
Boston, MA 02110
                                             M-PRSRC

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EATON VANCE PRIME RATE RESERVES


SEMI-ANNUAL SHAREHOLDER REPORT
JUNE 30, 1995



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