SEI INSTITUTIONAL MANAGED TRUST
497, 1995-09-08
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<PAGE>
 
                        SEI INSTITUTIONAL MANAGED TRUST

                     Supplement dated August 31, 1995, to
                    the Statement of Additional Information
                            dated January 31, 1995


This supplement to the Statement of Additional Information supersedes and
replaces any existing supplements to the Statement of Additional Information.
This supplement provides new and additional information beyond that contained in
the Statement of Additional Information and should be retained and read in
conjunction with such Statement of Additional Information.

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

Effective March 6, 1995, the name of the ProVantage Funds class of shares was
changed to Class D.

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

The first sentence of the current "Investment Limitations -- Fundamental
Policies" section on page S-10 is amended and restated as follows:

The Small Cap Value and Core Fixed Income Portfolios may not:

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

At meetings held on June 16, 1995 and adjourned until July 10, 1995, and on
August 11, 1995 and adjourned until August 14, 1995, Shareholders of the Large
Cap Value, Capital Growth, Capital Appreciation, Equity Income, Balanced, Small
Cap Growth, High Yield Bond, Bond, Mid-Cap, and Large Cap Growth Portfolios
voted to amend, reclassify or eliminate certain fundamental investment policies.
In connection with these changes, and with respect to the Large Cap Value,
Capital Growth, Capital Appreciation, Equity Income, Balanced, Small Cap Growth,
High Yield Bond, Bond, Mid-Cap, and Large Cap Growth Portfolios, the "Investment
Limitations -- Fundamental Policies" section of the Statement of Additional
Information is amended and the following language is inserted on page S-12:

The Large Cap Value, Capital Growth, Capital Appreciation, Equity Income,
Balanced, Small Cap Growth, High Yield Bond, Bond, Mid-Cap, Real Estate
Securities, and Large Cap Growth Portfolios may not:

1.   Borrow money in an amount exceeding 33 1/3% of the value of its total
assets, provided that, for purposes of this limitation, investment strategies
which either obligate a Portfolio to purchase securities or require a Portfolio
to segregate assets are not considered to be borrowings. To the extent that its
borrowings exceed 5% of its assets, (i) all borrowings will be repaid before
making additional investments and any interest paid on such borrowings will
reduce income; and (ii) asset coverage of at least 300% is required.

2.   Make loans if, as a result, more than 33 1/3% of its total assets would be
lent to other parties, except that each Portfolio may (i) purchase or hold debt
instruments in accordance with its investment objective and policies; (ii) enter
into repurchase agreements; and (iii) lend its securities.

3.   Purchase or sell real estate, physical commodities, or commodities
contracts, except that each Portfolio may purchase (i) marketable securities
issued by companies which own or invest in real estate (including real estate
investment trusts), commodities, or commodities contracts; and (ii) commodities
contracts relating to financial instruments, such as financial futures contracts
and options on such contracts.
<PAGE>
 
4.   Issue senior securities (as defined in the 1940 Act) except as permitted by
rule, regulation or order of the Securities and Exchange Commission (the "SEC").

5.   Act as an underwriter of securities of other issuers except as it may be
deemed an underwriter in selling a portfolio security.

6.   Invest in interests in oil, gas, or other mineral exploration or
development programs and oil, gas or mineral leases.

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

In connection with the foregoing fundamental policy changes, the Trustees have
adopted the following non-fundamental policies for the Large Cap Value, Capital
Growth, Capital Appreciation, Equity Income, Balanced, Small Cap Growth, High
Yield Bond, Bond, Mid-Cap, Real Estate Securities, and Large Cap Growth
Portfolios, which policies may be changed without Shareholder approval.
Accordingly, the "Investment Limitations -- Non-Fundamental Policies" section on
page S-12 is amended and restated to read as follows:

The Large Cap Value, Capital Growth, Capital Appreciation, Equity Income,
Balanced, Small Cap Growth, High Yield Bond, Bond, Mid-Cap, Real Estate
Securities, and Large Cap Growth Portfolios may not:

1.   Pledge, mortgage or hypothecate assets except to secure borrowings
permitted by the Portfolio's fundamental limitation on borrowing.

2.   Invest in companies for the purpose of exercising control.

3.   Purchase securities on margin or effect short sales, except that each
Portfolio may (i) obtain short-term credits as necessary for the clearance of
security transactions; (ii) provide initial and variation margin payments in
connection with transactions involving futures contracts and options on such
contracts; and (iii) make short sales "against the box" or in compliance with
the SEC's position regarding the asset segregation requirements imposed by
Section 18 of the 1940 Act.

4.   Invest its assets in securities of any investment company, except (i) by
purchase in the open market involving only customary brokers' commissions; (ii)
in connection with mergers, acquisitions of assets, or consolidations; or (iii)
as otherwise permitted by the 1940 Act.

5.   Purchase or retain securities of an issuer if, to the knowledge of the
Trust, an officer, trustee, partner or director of the Trust or any investment
adviser of the Trust owns beneficially more than 1/2 of the 1% of the shares or
securities of such issuer and all such officers, trustees, partners and
directors owning more than 1/2 of 1% of such shares or securities together own
more than 5% of such shares or securities.

6.   Purchase securities of any company which has (with predecessors) a record
of less than three years continuing operations if, as a result, more than 5% of
the total assets (taken at fair market value) would be invested in such
securities.

7.   Purchase illiquid securities, i.e., securities that cannot be disposed of
for their approximate carrying value in seven days or less (which term includes
repurchase agreements and time deposits maturing in more than seven days) if, in
the aggregate, more than 15% of its total assets would be invested in illiquid
securities. Notwithstanding the foregoing, securities eligible to be re-sold
under Rule 144A of the 1933 Act may be treated as liquid securities under
procedures adopted by the Board of Trustees.

                                       2
<PAGE>
 
8.   Purchase securities which must be registered under the 1933 Act, as
amended, before they may be sold to the public, if, in the aggregate, more than
15% of its total assets would be invested in such restricted securities.
Securities exempted from registration upon re-sale by Rule 144A under the 1933
Act are not deemed to be restricted securities for purposes of this limitation.

Additional Restrictions

The following are non-fundamental investment limitations that are currently
required by one or more states in which the Trust sells shares of the
Portfolios.  These limitations are in addition to, and in some cases more
restrictive than, the fundamental and non-fundamental investment limitations
listed above.  A limitation may be changed or eliminated without shareholder
approval if the relevant state changes or eliminates its policy regarding such
investment restriction.  As long as a Portfolio's shares are registered for sale
in such states, it may not:

1.   Invest more than 5% of its net assets in warrants; provided that of this 5%
     no more than 2% will be in warrants that are not listed on the New York
     Stock Exchange or the American Stock Exchange.

2.   Invest in the securities of other investment companies except by purchase
     in the open market where no commission or profit to a sponsor or dealer
     results from the purchase other than the customary broker's commission, or
     except when the purchase is part of a plan of merger, consolidation,
     reorganization or acquisition.

3.   Invest more than 15% of its total assets (10% with respect to the Small Cap
     Value and Core Fixed Income Portfolios) in illiquid securities, including
     securities which are not readily marketable or are restricted.

4.   Invest more than 15% of its assets in restricted securities.  For purposes
     of this limitation, securities exempted from registration under the 1933
     Act, including Rule 144A securities, are considered to be restricted
     securities.

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

In addition to amending and reclassifying certain of the Trust's fundamental
investment policies, Shareholders of the Bond Portfolio voted to eliminate that
Portfolio's fundamental investment limitations on investing in convertible
securities and on investing solely in securities listed as "appropriate"
investments.

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

At a meeting scheduled for November 13, 1995, Shareholders of the Small Cap
Value and Core Fixed Income Portfolios will be asked to vote to amend,
reclassify or eliminate certain fundamental investment policies.  The changes to
the Portfolios' fundamental investment policies will be identical to the changes
approved by Shareholders of the Large Cap Value, Capital Appreciation, Capital
Growth, Equity Income, Real Estate Securities, Small Cap Growth, High Yield
Bond, Bond, Balanced, Mid-Cap, and Large Cap Growth Portfolios.

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

The following information is inserted under "Portfolio Transactions" in the
Statement of Additional Information:

In addition, SFM has adopted a policy respecting the receipt of research and
related products and services in connection with transactions effected for
Portfolios operating within the "Manager of Managers" structure.  Under this
policy, SFM and the various firms that serve as sub-advisers to certain
Portfolios of the Trust, in the exercise of joint investment discretion over the
assets of a Portfolio, will direct a substantial portion of a Portfolio's
brokerage to the Distributor in consideration of the Distributor's provision of
research and related

                                       3
<PAGE>
 
products to SFM for use in performing its advisory responsibilities.  All such
transactions directed to the Distributor must be accomplished in a manner that
is consistent with the Trust's policy to achieve best net results, and must
comply with the Trust's procedures regarding the execution of transactions
through affiliated brokers.

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

Martingale Asset Management, L.P.,  Apodaca-Johnston Capital Management, and
Wall Street Associates are added to, and BEA Associates replaces CS First Boston
Investment Management on the list of advisers on the front page of the Statement
of Additional Information.

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

The first sentence of the "Description of Permitted Investments - Securities
Lending" section on page S-7 of the Statement of Additional Information is
amended and restated to read as follows:

Securities Lending - In order to generate additional income, each Portfolio of
the Trust except the Core Fixed Income Portfolio may lend its securities
pursuant to agreements requiring that the loans be continuously secured by cash,
securities of the U.S. Government or its agencies, or any combination of cash
and such securities in an amount at least equal to the market value of the
securities lent.

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

The Statement of Additional Information for SEI Institutional Managed Trust is
hereby amended and supplemented by the following unaudited financial statements
of the Large Cap Growth and Small Cap Value Portfolios for the period ended
March 31, 1995, and of the High Yield Bond Portfolio for the period ended May
31, 1995.

                                       4
<PAGE>
 
STATEMENT OF NET ASSETS
--------------------------------------------------------------------------------
SEI Institutional Managed Trust -- March 31, 1995 (Unaudited)
LARGE CAP GROWTH PORTFOLIO
--------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                       Market
                                       Value
Description                   Shares   (000)
----------------------------------------------
<S>                           <C>     <C>
COMMON STOCKS -- 96.3%
AIR TRANSPORTATION -- 0.5%
 AMR*                          10,550 $    683
                                      --------
AIRCRAFT -- 1.2%
 Allied Signal                 38,500    1,511
                                      --------
AUTOMOTIVE -- 0.5%
 Magna International, Cl A     18,800      717
                                      --------
BANKS -- 2.7%
 BankAmerica                   29,650    1,431
 Citicorp                      14,350      610
 First Chicago                 30,200    1,513
                                      --------
                                         3,554
                                      --------
BEAUTY PRODUCTS -- 5.2%
 Avon Products*                11,000      666
 Colgate Palmolive             23,000    1,518
 Procter & Gamble              69,650    4,614
                                      --------
                                         6,798
                                      --------
BROADCASTING, NEWSPAPERS & ADVERTISING --
  2.1%
 Comcast                       62,000      969
 Tele-Communications*          83,700    1,757
                                      --------
                                         2,726
                                      --------
CHEMICALS -- 3.2%
 Air Products & Chemicals       9,900      516
 Monsanto                      17,000    1,364
 Rohm & Haas                   34,000    2,006
 Union Carbide                 12,000      368
                                      --------
                                         4,254
                                      --------
COMMUNICATIONS EQUIPMENT -- 3.9%
 General Instrument*           48,000    1,668
 L M Ericsson Telephone        11,900      736
 Motorola                      42,400    2,316
 Northern Telecom LTD           9,800      371
                                      --------
                                         5,091
                                      --------
COMPUTERS & SERVICES -- 7.5%
 Cisco Systems*                85,000    3,241
 Compaq Computer*              64,600    2,229
 Informix*                     22,000      756
 Lotus Development*             6,500      249
 Microsoft*                    17,650    1,255
 Oracle Systems*               52,000    1,625
 Silicon Graphics*             16,000      568
                                      --------
                                         9,923
                                      --------
</TABLE>
 
--------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                          Market
Description                     Shares  Value (000)
---------------------------------------------------
<S>                             <C>     <C>
CONTAINERS & PACKAGING -- 0.4%
 Crown Cork & Seal*              13,650  $    599
                                         --------
DRUGS -- 9.0%
 Abbott Laboratories             57,900     2,063
 Centocor*                       23,500       373
 Forest Labs*                    12,400       591
 Genentech*                       6,700       314
 Johnson & Johnson               18,300     1,089
 Merck                           95,400     4,068
 Pfizer                          39,650     3,400
                                         --------
                                           11,898
                                         --------
ELECTRICAL TECHNOLOGY -- 0.6%
 Duracell                        16,400       734
                                         --------
ENTERTAINMENT -- 1.2%
 Walt Disney                     30,000     1,601
                                         --------
ENVIRONMENTAL SERVICES -- 0.5%
 WMX Technologies                23,450       645
                                         --------
FINANCIAL SERVICES -- 3.0%
 FHLMC                           19,000     1,150
 FNMA                            25,950     2,111
 Household International         15,450       672
                                         --------
                                            3,933
                                         --------
FOOD, BEVERAGE & TOBACCO -- 8.3%
 Coca-Cola                       68,450     3,867
 Kellogg                         19,000     1,109
 Pepsico                         47,000     1,833
 Philip Morris                   64,250     4,193
                                         --------
                                           11,002
                                         --------
GAS/NATURAL GAS -- 0.9%
 Enron                           37,400     1,234
                                         --------
HOTELS & LODGING -- 0.6%
 Hilton Hotels                   10,700       793
                                         --------
HOUSEHOLD PRODUCTS -- 1.1%
 Gillette                        18,300     1,494
                                         --------
INSURANCE -- 5.4%
 American International Group    33,900     3,534
 General RE                      13,850     1,828
 MGIC Investment                  6,100       249
 NAC RE                          12,500       378
 Travelers                       31,000     1,197
                                         --------
                                            7,186
                                         --------
</TABLE>
 

<PAGE>
 
STATEMENT OF NET ASSETS
--------------------------------------------------------------------------------
SEI Institutional Managed Trust -- March 31, 1995 (Unaudited)
LARGE CAP GROWTH PORTFOLIO
--------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                             Market
Description                        Shares  Value (000)
------------------------------------------------------
<S>                                <C>     <C>
MACHINERY -- 7.5%
 Caterpillar                        26,900  $  1,496
 Emerson Electric                    9,350       622
 General Electric                  129,550     7,012
 Stewart & Stevenson Services       20,100       709
                                            --------
                                               9,839
                                            --------
 
 
MEDICAL PRODUCTS & SERVICES -- 4.3%
 Columbia HCA Healthcare            42,000     1,806
 Medtronic                          16,150     1,120
 United Healthcare                  59,450     2,779
                                            --------
                                               5,705
                                            --------
MISCELLANEOUS BUSINESS SERVICES -- 0.7%
 Computer Associates International   8,850       525
 Sybase*                             9,500       380
                                            --------
                                                 905
                                            --------
PAPER & PAPER PRODUCTS -- 0.3%
 Scott Paper                         4,300       384
                                            --------
PETROLEUM & FUEL PRODUCTS -- 0.8%
 Apache                             10,500       286
 Western Atlas*                     17,500       755
                                            --------
                                               1,041
                                            --------
PETROLEUM REFINING -- 1.4%
 Amoco                              15,150       964
 Mobil                               9,450       875
                                            --------
                                               1,839
                                            --------
PHOTOGRAPHIC EQUIPMENT & SUPPLIES -- 1.4%
 Eastman Kodak                      23,000     1,222
 Xerox                               5,700       669
                                            --------
                                               1,891
                                            --------
PRINTING & PUBLISHING -- 0.6%
 Time Warner                        19,950       753
                                            --------
PROFESSIONAL SERVICES -- 0.7%
 First Financial Management         13,800       997
                                            --------
RAILROADS -- 1.5%
 Burlington Northern                13,000       772
 Conrail                             7,000       393
 CSX                                10,600       835
                                            --------
                                               2,000
                                            --------
</TABLE>
 
--------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                               Shares/Face    Market
Description                                    Amount (000) Value (000)
-----------------------------------------------------------------------
<S>                                            <C>          <C>
RETAIL -- 8.3%
 Autozone*                                        11,500     $    286
 Dayton Hudson                                    19,450        1,391
 Home Depot                                       60,000        2,655
 Kohl's*                                          19,000          841
 McDonald's                                       73,300        2,501
 Pep Boys-Manny Moe & Jack                        17,600          546
 Wal-Mart                                        108,150        2,757
                                                             --------
                                                               10,977
                                                             --------
RUBBER & PLASTIC -- 0.9%
 Illinois Tool Works                              24,050        1,175
                                                             --------
SEMI-CONDUCTORS/INSTRUMENTS -- 3.4%
 Intel                                            52,750        4,477
                                                             --------
STEEL & STEEL WORKS -- 2.0%
 Aluminum Company of America                      17,300          716
 Inco LTD                                         20,550          573
 Nucor                                            23,500        1,321
                                                             --------
                                                                2,610
                                                             --------
TELEPHONES & TELECOMMUNICATION -- 4.7%
 Airtouch Communications*                         56,850        1,549
 AT&T                                             35,500        1,837
 Bellsouth                                         6,800          405
 MCI                                              82,100        1,693
 US West                                          16,900          676
                                                             --------
                                                                6,160
                                                             --------
Total Common Stocks
 (Cost $121,253)                                              127,129
                                                             --------
U.S. TREASURY OBLIGATIONS -- 6.9%
 U.S. Treasury Bill
  5.449%, 04/06/95                                $9,174        9,165
                                                             --------
Total U.S. Treasury Obligations (Cost $9,167)                   9,165
                                                             --------
U.S. GOVERNMENT AGENCY OBLIGATIONS -- 2.5%
 FHLB Discount Notes
  6.100%, 04/03/95                                 2,000        1,998
  6.050%, 04/05/95                                   200          200
 FHLMC
  5.920%, 04/10/95                                   100          100
  5.910%, 04/13/95                                   189          189
 FNMA
  5.930%, 04/19/95                                   790          788
                                                             --------
Total U.S. Government Agency
 Obligations
 (Cost $3,275)                                                  3,275
                                                             --------
Total Investments -- 105.7%
 (Cost $133,693)                                              139,569
                                                             --------
</TABLE>
 
 
2
<PAGE>
 
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                       Market
                                                         Shares/Face   Value
Description                                              Amount (000)  (000)
-------------------------------------------------------------------------------
<S>                                                      <C>          <C>
OTHER ASSETS AND LIABILITIES -- -5.7%
 Other Assets and Liabilities, Net                                    $ (7,612)
                                                                      --------
NET ASSETS:
 Portfolio shares of Class A (unlimited authorization --
   no par value) based on 12,235,093 outstanding shares
  of beneficial interest                                               125,724
 Undistributed net investment income                                       402
 Accumulated net realized loss on investments                              (45)
 Net unrealized appreciation on investments                              5,876
                                                                      --------
 Total Net Assets -- 100.0%                                           $131,957
                                                                      ========
 Net Asset Value, Offering and Redemption Price Per
  Share -- Class A                                                    $  10.79
                                                                      ========
</TABLE>
* Non-income producing security
FHLB   Federal Home Loan Bank
FHLMC  Federal Home Loan Mortgage Corporation
FNMA   Federal National Mortgage Association
Cl     Class
LTD    Limited
 
SMALL CAP VALUE PORTFOLIO
 
<TABLE>
<S>                                                            <C>     <C>
COMMON STOCKS -- 91.3%                                      
AIRCRAFT -- 0.5%                                            
 Coltec Industries*                                             15,100 $   260
                                                                       -------
APPAREL/TEXTILES -- 6.8%                                    
 Cone Mills*                                                    21,600     265
 Congoleum, Cl A*                                               31,300     470
 Conso Products*                                                21,000     294
 Crown Crafts                                                   25,200     428
 Jones Apparel*                                                 11,500     311
 Lydall*                                                        20,200     681
 Oneita Industries*                                             18,700     227
 Springs Industries                                             10,300     386
 St. John Knits                                                  4,800     175
                                                                       -------
                                                                         3,237
                                                                       -------
AUTOMOTIVE -- 0.2%                                          
 Stant                                                           7,600     105
                                                                       -------
</TABLE>
 
--------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                      Market
Description                                                 Shares  Value (000)
--------------------------------------------------------------------------------
<S>                                                         <C>     <C>
BANKS -- 8.2%                                        
 Albank Financial                                            15,500   $   388
 Amfed Financial                                             23,900       555
 BankAtlantic Bancorp                                        17,000       264
 Banknorth Group                                             18,100       425
 DS Bancor*                                                   6,930       168
 First Federal Bancshares*                                   19,000       221
 Green Point Financial                                       18,500       428
 Long Island Bancorp*                                        22,400       392
 Mercantile Bankshares                                       17,800       394
 MLF Bancorp*                                                18,900       302
 Southern National                                           19,207       382
                                                                      -------
                                                                        3,919
                                                                      -------
CHEMICALS -- 2.4%                                    
 Bush Boake Allen*                                           14,700       397
 IMC Global                                                  12,100       591
 Vigoro                                                       4,600       170
                                                                      -------
                                                                        1,158
                                                                      -------
COMMUNICATIONS EQUIPMENT -- 1.7%                     
 Harmon Industries*                                          15,100       211
 Plantronics*                                                21,400       592
                                                                      -------
                                                                          803
                                                                      -------
COMPUTERS & SERVICES -- 0.9%                         
 Franklin Electric Publishing*                               15,400       433
                                                                      -------
CONSUMER PRODUCTS -- 4.4%                            
 Maxwell Shoe*                                               13,100       134
 National-Standard*                                          27,400       308
 Nine West*                                                  14,900       440
 Nu-Kote Holding, Cl A*                                      32,100       746
 Velcro Industries                                            7,300       433
                                                                      -------
                                                                        2,061
                                                                      -------
CONTAINERS & PACKAGING -- 2.3%                       
 Sealright                                                   14,800       281
 US Can*                                                     39,000       829
                                                                      -------
                                                                        1,110
                                                                      -------
ENTERTAINMENT -- 2.4%                                
 Casino America*                                             18,600       233
 Dick Clark Productions*                                     27,000       243
 Harvey's Casinos                                             6,000       111
 King World Productions*                                     10,800       425
 Spelling Entertainment                                      12,600       129
                                                                      -------
                                                                        1,141
                                                                      -------
</TABLE>
 
 
                                                                               3
<PAGE>
 
STATEMENT OF NET ASSETS
--------------------------------------------------------------------------------
SEI Institutional Managed Trust -- March 31, 1995 (Unaudited)
SMALL CAP VALUE PORTFOLIO
--------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                            Market
Description                       Shares  Value (000)
-----------------------------------------------------
<S>                               <C>     <C>
FINANCIAL SERVICES -- 0.7%
 Baldwin & Lyons, Cl B             20,100   $   327
                                            -------
FOOD, BEVERAGE & TOBACCO -- 1.2%
 WLR Foods                         20,800       562
                                            -------
GLASS PRODUCTS -- 0.8%
 Libbey                            20,800       387
                                            -------
HOUSEHOLD PRODUCTS -- 1.0%
 Cherry, Cl A*                     28,800       461
                                            -------
INSURANCE -- 11.0%
 First Colony                      21,200       480
 Harleysville Group                21,500       524
 Home State Holdings*              28,800       396
 Horace Mann Educators             18,500       409
 Life Partners                      8,600       169
 National RE Holding               11,600       339
 Partnerre Holdings                20,400       434
 Paul Revere                       21,400       348
 Penncorp Financial                27,900       492
 Phoenix RE                         6,000       145
 Security Capital*                  4,500       214
 State Auto Financial              23,400       392
 TIG Holdings                      33,300       746
 W.R. Berkley                       4,550       167
                                            -------
                                              5,255
                                            -------
MACHINERY -- 9.6%
 Alamo Group                       23,900       412
 BW/IP Holding, Cl A               38,600       637
 Chase Brass*                      20,300       211
 CMI, Cl A*                        74,400       493
 DT Industries                     29,500       354
 Exide Electronics*                26,500       417
 Holophane*                        21,300       389
 Kulicke & Soffa*                  12,800       350
 NN Ball & Roller                  14,300       215
 Pentair                           17,700       747
 SPX                               24,800       360
                                            -------
                                              4,585
                                            -------
MARINE TRANSPORTATION -- 1.7%
 Royal Caribbean Cruises LTD       30,400       794
                                            -------
MEASURING DEVICES -- 2.8%
 Mark IV Industries                21,400       439
 Oak Industries*                   29,000       746
 Veeco Instruments*                11,900       167
                                            -------
                                              1,352
                                            -------
</TABLE>
 
--------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                          Market
Description                     Shares  Value (000)
---------------------------------------------------
<S>                             <C>     <C>
MEDICAL PRODUCTS & SERVICES -- 1.4%
 Gelman Sciences*                14,400   $   247
 Sterile Concepts                31,400       412
                                          -------
                                              659
                                          -------
MISCELLANEOUS BUSINESS SERVICES -- 2.9%
 Computer Horizons*              18,000       320
 GBC Technologies*               31,900       215
 Intersolv*                      21,500       344
 Opti*                           30,400       490
                                          -------
                                            1,369
                                          -------
MISCELLANEOUS MANUFACTURING -- 3.0%
 Belden                           5,400       119
 Cable Design Technologies*      32,600       489
 Mikohn Gaming*                  20,900       178
 Wolverine Tube*                 25,600       639
                                          -------
                                            1,425
                                          -------
OFFICE FURNITURE & FIXTURES -- 0.6%
 Daisytek*                       13,100       283
                                          -------
PAPER & PAPER PRODUCTS -- 1.6%
 Caraustar                       27,600       469
 Chesapeake                       8,500       272
                                          -------
                                              741
                                          -------
PETROLEUM & FUEL PRODUCTS -- 0.9%
 Petroleum Geo-Services ADR*     18,700       416
                                          -------
RETAIL -- 10.9%
 American Eagle Outfitters*      19,700       347
 Bradlees                        19,400       216
 Catherine's Stores*             50,100       438
 Consolidated Products*          45,960       540
 Consolidated Stores*            22,000       443
 Daka International*             26,400       495
 Fingerhut                       11,650       138
 Fred's                          30,600       298
 J Baker & Co                    22,200       339
 Little Switzerland*             30,600       153
 Mueller Industries*              7,000       234
 Shoney's*                       17,700       190
 The Bombay Company*             23,000       210
 Value City Department Stores*   27,800       226
 Vons Companies*                 24,500       475
 Waban*                          22,900       452
                                          -------
                                            5,194
                                          -------
</TABLE>
 
 
4
<PAGE>
 
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                    Market
                                                       Shares/Face   Value
Description                                            Amount (000)  (000)
---------------------------------------------------------------------------
<S>                                                    <C>          <C>
RUBBER & PLASTIC -- 2.2%
 Aptargroup                                               19,300    $   553
 West Company                                             20,200        515
                                                                    -------
                                                                      1,068
                                                                    -------
SEMI-CONDUCTORS/INSTRUMENTS -- 2.5%
 DH Technology*                                           29,700        616
 Lattice Semiconductor*                                    5,200        128
 Marshall*                                                17,800        463
                                                                    -------
                                                                      1,207
                                                                    -------
SPORTING & ATHLETIC GOODS -- 0.6%
 First Team Sports*                                       12,450        282
                                                                    -------
STEEL & STEEL WORKS -- 1.8%
 Precision Castparts                                      13,900        363
 Rouge Steel                                              20,400        500
                                                                    -------
                                                                        863
                                                                    -------
TELEPHONES & TELECOMMUNICATION -- 0.9%
 EIS International*                                       25,700        430
                                                                    -------
TRUCKING -- 0.5%
 Arkansas Best                                            20,100        214
                                                                    -------
WATCHES CLOCKS & PARTS -- 0.6%
 North American Watch                                     18,800        259
                                                                    -------
WHOLESALE -- 2.3%
 Fisher Scientific                                        15,700        467
 Masland                                                   9,800        126
 TBC*                                                     51,800        525
                                                                    -------
                                                                      1,118
                                                                    -------
Total Common Stocks
 (Cost $42,584)                                                      43,478
                                                                    -------
REPURCHASE AGREEMENT -- 18.1%
Lehman Brothers
 6.20%, dated 03/31/95, matures 04/03/95, repurchase
 price $8,642,000 (collateralized by FHLMC obligation,
 par value $8,580,000, 8.50%, 02/15/95, market value
 of collateral: $8,814,000)                              $ 8,638    $ 8,638
                                                                    -------
Total Repurchase Agreement
 (Cost $8,638)                                                        8,638
                                                                    -------
Total Investments -- 109.4%
 (Cost $51,222)                                                      52,116
                                                                    -------
</TABLE>
The accompanying notes are an integral part of the financial statements.
--------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                     Market
Description                                                        Value (000)
------------------------------------------------------------------------------
<S>                                                                <C>
OTHER ASSETS AND LIABILITIES -- -9.4%
 Other Assets and Liabilities, Net                                   $(4,508)
                                                                     -------
NET ASSETS:
 Portfolio shares of Class A (unlimited authorization -- no par
  value) based on 4,530,901 outstanding shares of beneficial
  interest                                                            46,736
 Undistributed net investment income                                      58
 Accumulated net realized loss on investments                            (80)
 Net unrealized appreciation on investments                              894
                                                                     -------
 Total Net Assets -- 100.0%                                          $47,608
                                                                     =======
 Net Asset Value, Offering and Redemption Price Per Share -- Class
  A                                                                  $ 10.51
                                                                     =======
</TABLE>
 * Non-income producing securities
ADR    American Depository Receipt
Cl     Class
FHLMC  Federal Home Loan Mortgage Corporation
 
                                                                               5
<PAGE>
 
STATEMENT OF OPERATIONS (000)
--------------------------------------------------------------------------------
SEI Institutional Managed Trust -- For the period ended March 31, 1995
(Unaudited)
<TABLE>
<CAPTION>
                                                      --------- ---------
                                                      LARGE CAP SMALL CAP
                                                       GROWTH     VALUE
                                                      --------- ---------
<S>                                                   <C>       <C>
INVESTMENT INCOME:
 Dividends                                             $  377     $ 55
 Interest                                                 207       82
                                                       ------     ----
 Total investment income                                  584      137
                                                       ------     ----
EXPENSES:
 Management fees                                           72       25
 Less management fees waived                               --       --
 Contribution from Manager                                 --       --
 Investment advisory fees                                  82       47
 Less investment advisory fees waived                      --       (1)
 Custodian/wire agent fees                                  4        1
 Professional fees                                          4        2
 Registration & filing fees                                 1        1
 Printing expense                                           5        1
 Trustee fees                                              --       --
 Insurance expense                                         --       --
 Pricing fees                                               1       --
 Distribution fees                                          4        1
 Amortization of deferred
  organization costs                                        1        1
                                                       ------     ----
 Total expenses                                           174       78
                                                       ------     ----
NET INVESTMENT INCOME                                     410       59
                                                       ------     ----
NET REALIZED AND UNREALIZED GAIN ON INVESTMENTS
 Net realized gain (loss) from securities sold            (45)     (81)
 Net change in unrealized appreciation on investments   5,876      894
                                                       ------     ----
NET INCREASE IN NET ASSETS FROM OPERATIONS             $6,241     $872
                                                       ======     ====
</TABLE>
 
 
The accompanying notes are an integral part of the financial statements.
 
6
<PAGE>
 
STATEMENT OF CHANGES IN NET ASSETS (000)
--------------------------------------------------------------------------------
SEI Institutional Managed Trust -- (Unaudited)
<TABLE>
<CAPTION>
                                                         ---------  ---------
                                                         LARGE CAP  SMALL CAP
                                                          GROWTH      VALUE
                                                         ---------  ---------
                                                         12/20/94-  12/20/94-
                                                          3/31/95    3/31/95
                                                         ---------  ---------
<S>                                                      <C>        <C>
OPERATIONS:
 Net investment income (loss)                            $    410    $    59
 Net realized gain (loss) from security transactions          (45)       (81)
 Net realized appreciation (depreciation) on investments    5,876        894
                                                         --------    -------
 Net increase (decrease) in net assets resulting from
  operations                                                6,241        872
                                                         --------    -------
DIVIDENDS DISTRIBUTED FROM:
 Net investment income:
  Class A                                                      (8)        --
                                                         --------    -------
 Total dividends distributed                                   (8)        --
                                                         --------    -------
CAPITAL SHARE TRANSACTIONS:
 Class A:
  Proceeds from shares issued                             130,165     50,289
  Shares issued in lieu of cash distributions                   8         --
  Cost of shares repurchased                               (4,449)    (3,553)
                                                         --------    -------
  Increase (decrease) in net assets derived from
   Class A transactions                                   125,724     46,736
                                                         --------    -------
   Net increase (decrease) in net assets                  131,957     47,608
                                                         --------    -------
NET ASSETS:
 Beginning of period                                           --         --
                                                         --------    -------
 End of period                                           $131,957    $47,608
                                                         ========    =======
CAPITAL SHARE TRANSACTIONS:
 Class A:
  Shares issued                                            12,659      4,873
  Shares issued in lieu of cash distributions                   1         --
  Shares repurchased                                         (425)      (342)
                                                         --------    -------
  Total Class A transactions                               12,235      4,531
                                                         ========    =======
</TABLE>
 
 
The accompanying notes are an integral part of the financial statements.
 
                                                                               7
<PAGE>
 
FINANCIAL HIGHLIGHTS
--------------------------------------------------------------------------------
SEI Institutional Managed Trust -- For a share outstanding throughout the
period (Unaudited)
<TABLE>
<CAPTION>
                                                              Distributions
             Net Asset    Net     Net Realized and Dividends      from                                      Ratio of
               Value   Investment    Unrealized     from Net    Realized    Net Asset          Net Assets   Expenses
             Beginning   Income    Gain (Losses)   Investment    Capital    Value End Total      End of    to Average
             of Period   (Loss)    on Securities     Income       Gains     of Period Return  Period (000) Net Assets
---------------------------------------------------------------------------------------------------------------------
 <S>         <C>       <C>        <C>              <C>        <C>           <C>       <C>     <C>          <C>
 --------------------------
 LARGE CAP GROWTH PORTFOLIO
 --------------------------
 1995**(1)    $10.00     $0.05         $0.76         $(0.02)       $--       $10.79   32.43%    $131,957      0.85%
 -------------------------
 SMALL CAP VALUE PORTFOLIO
 -------------------------
 1995**(2)    $10.00     $0.01         $0.50         $   --        $--       $10.51   19.69%    $ 47,608      1.10%
<CAPTION>
                                      Ratio of Net
             Ratio of Net   Ratio of   Investment
              Investment    Expenses  Income (Loss)
                Income     to Average  to Average
                (Loss)     Net Assets  Net Assets   Portfolio
              to Average   (Excluding  (Excluding   Turnover
              Net Assets    Waivers)    Waivers)      Rate
---------------------------------------------------------------------------------------------------------------------
 <S>         <C>           <C>        <C>           <C>
 --------------------------
 LARGE CAP GROWTH PORTFOLIO
 --------------------------
 1995**(1)       1.98%        0.85%       1.98%         16%
 -------------------------
 SMALL CAP VALUE PORTFOLIO
 -------------------------
 1995**(2)       0.81%        1.11%       0.80%          3%
</TABLE>
 
1  Large Cap Growth shares were offered beginning December 20, 1994. All ratios
   including total return for that period have been annualized.
2  Small Cap Value shares were offered beginning December 20, 1994. All ratios
   including total return for that period have been annualized.
** For the period ended March 31, 1995.
 
 
 
 
The accompanying notes are an integral part of the financial statements.
 
8
<PAGE>
 
NOTES TO FINANCIAL STATEMENTS
--------------------------------------------------------------------------------
SEI Institutional Managed Trust -- March 31, 1995 (Unaudited)



1. ORGANIZATION
 
SEI Institutional Managed Trust (the "Trust") is organized as a Massachusetts
business trust under a Declaration of Trust dated October 20, 1986.
 
2. SIGNIFICANT ACCOUNTING POLICIES
 
The Trust is registered under the Investment Company Act of 1940, as amended,
as an open-end investment company with twelve diversified Portfolios and one
non-diversified portfolio (the "Portfolios"): Large Cap Value, Large Cap
Growth, Small Cap Value, Small Cap Growth, Mid-Cap Growth, Capital Apprecia-
tion, Equity Income, Balanced, Capital Growth, Core Fixed Income, Bond, and
High Yield Bond. The Real Estate Securities Portfolio had not commenced opera-
tions as of March 31, 1995. The Trust is registered to offer Class A, Class B
and Class D shares of the Large Cap Value, Large Cap Growth, Small Cap Value,
Small Cap Growth, Mid-Cap Growth, Capital Appreciation, Equity Income, Bal-
anced, Core Fixed Income, Bond, and High Yield Bond Portfolios. The following
is a summary of the significant accounting policies followed by the Trust.
  Security Valuation--Investments in equity securities which are traded on a
national securities exchange (or reported on NASDAQ national market system) are
stated at the last quoted sales price if readily available for such equity se-
curities on each business day; other equity securities traded in the over-the-
counter market and listed equity securities for which no sale was reported on
that date are stated at the last quoted bid price. Debt obligations with re-
maining maturities in excess of sixty days are valued at the most recently
quoted bid price. Debt obligations with remaining maturities of sixty days or
less are valued at their amortized cost.
  Federal Income Taxes--It is each Portfolio's intention to qualify as a regu-
lated investment company for Federal income tax purposes and distribute all of
its taxable income (including net capital gains). Accordingly, no provision for
Federal income taxes is required.
  Net Asset Value Per Share--Net asset value per share is calculated on a daily
basis by dividing the assets of each Portfolio less its liabilities by the num-
ber of outstanding shares of the Portfolio.
  Repurchase Agreements--Securities pledged as collateral for repurchase agree-
ments are held by each Portfolio's custodian bank until maturity of the Repur-
chase Agreement. Provisions of the Agreement and procedures adopted by the Man-
ager and the Advisers of the Trust ensure that the market value of the collat-
eral, including accrued interest thereon, is sufficient in the event of default
by the counterparty. The Portfolios also invest in tri-party repurchase agree-
ments. Securities held as collateral for tri-party repurchase agreements are
maintained by the broker's custodian bank in a segregated account until matu-
rity of the repurchase agreement. Provisions of the agreements ensure that the
market value of the collateral, including accrued interest thereon, is suffi-
cient in the event of default. If the counterparty defaults and the value of
the collateral declines or if the counterparty enters into an insolvency pro-
ceeding, realization of the collateral by the Portfolios may be delayed or lim-
ited.
  Discount and Premium Amortization--All amortization is calculated using the
effective interest method over the holding period of the security. Amortization
of premiums and discounts is included in interest income.
  Classes--Class-specific expenses are borne by that class of shares. Income,
expenses, and realized and unrealized gains/losses are allocated to the respec-
tive classes on the basis of relative daily net assets.
  Distributions--Distributions from net investment income are paid to Share-
holders monthly for the Large Cap Value, Capital Appreciation, Equity Income,
Balanced, Capital Growth, Core Fixed Income, Bond, and High Yield Bond Portfo-
lios and quarterly for the Large Cap Growth, Small Cap Value, Small Cap Growth,
and Mid-Cap Growth Portfolios. Any net realized capital gains on the sales of
securities by a Portfolio are distributed annually to the Shareholders of that
Portfolio.
  Futures Contracts--The Core Fixed Income Portfolio utilized U.S. Long Bond
futures contracts to a limited extent during the period ended March 31, 1995.
Initial margin deposits of cash or securities
 
                                                                               9
<PAGE>
 
NOTES TO FINANCIAL STATEMENTS (Continued)
--------------------------------------------------------------------------------
SEI Institutional Managed Trust -- March 31, 1995 (Unaudited)


are made upon entering into futures contracts. The contracts are marked to mar-
ket daily and the resulting changes in value are accounted for as unrealized
gains and losses. Variation margin payments are paid or received, depending
upon whether unrealized losses or gains are incurred. When the contract is
closed, the Portfolio records a realized gain or loss equal to the difference
between the proceeds from (or cost of) the closing transaction and the amount
invested in the contract.
  Risks related to futures contracts include the possibility that there may not
be a liquid market for the contracts, that changes in the values of the con-
tract may not directly correlate with changes in the values of the underlying
securities, and that the counterparty to a contract may default on its obliga-
tion to perform.
  Structured Notes and Indexed Notes--The Core Fixed Income Portfolio may in-
vest in structured notes and indexed notes whose values are linked either di-
rectly or inversely to changes in foreign currency exchange rates, interest
rates, indexes, or other reference instruments. The values of these instruments
may be more volatile than the rates, indexes or instruments to which they re-
fer, but any loss is limited to the amount of the original investment.
  Other--Security transactions are recorded on the trade date of the security
purchase or sale. Cost used in determining net realized capital gains and
losses on the sale of securities are those of the specific securities sold.
Dividend income is recognized on the ex-dividend date, and interest income is
recognized on the accrual basis.
 
3. MANAGEMENT, INVESTMENT ADVISORY, SUB-ADVISORY, AND DISTRIBUTION AGREEMENTS
 
The Trust and SEI Financial Management Corporation (the "Manager"), a wholly-
owned subsidiary of SEI Corporation, are parties to a management agreement (the
"Agreement") dated January 22, 1987. Under this agreement, the Manager provides
management, administrative, and shareholder servicing for an annual fee of .35%
of the average daily net assets of the Large Cap Value, Large Cap Growth, Small
Cap Value and High Yield Bond Portfolios; .50% of the average daily net assets
of the Small Cap Growth, Mid-Cap Growth, Capital Appreciation, Equity Income,
Balanced, and Capital Growth Portfolios; and .43% of the average daily net as-
sets of the Core Fixed Income and Bond Portfolios. The Manager has agreed to
waive its fee so that the total annual expenses of each portfolio will not ex-
ceed the lower of the maximum limitations established by certain states or vol-
untary expense limitations adopted by the Manager. In the event that the total
annual expenses of a Portfolio, after reflecting a waiver of all fees by the
Manager, exceed the specific limitation, the Manager has agreed to bear such
excess.
  As of December 16, 1994, SEI Financial Management ("SFM") serves as the in-
vestment advisor to the Large Cap Value, Large Cap Growth, Small Cap Value, and
High Yield Bond Portfolios pursuant to an investment advisory agreement with
the Trust. For its services, SFM receives a fee of .35% of the average daily
net assets of the Large Cap Value Portfolio, .40% of the average daily net as-
sets of the Large Cap Growth Portfolio, .65% of the average daily net assets of
the Small Cap Value Portfolio, and .4875% of the average daily net assets of
the High Yield Bond Portfolio. For the period ended March 31, 1995, SFM re-
ceived $155,000, $82,000, $47,000, and $6,000 as compensation for its services
as investment adviser to the Large Cap Value, Large Cap Growth, Small Cap Val-
ue, and High Yield Bond Portfolios, respectively.
  Mellon Equity Associates ("Mellon") serves as an investment sub-advisor to a
portion of the assets of the Large Cap Value Portfolio, and is party to an in-
vestment sub-advisory agreement with the Trust dated December 16, 1994. Under
the investment sub-advisory agreement with the Trust and SFM, Mellon receives
an annual fee of .20% of the average monthly market value of investments under
its management. Prior to December 16, 1994 Mellon served as the investment ad-
viser of the Large Cap Value Portfolio, and was party to an investment advisory
agreement with the Trust dated October 3, 1994. Under the investment advisory
agreement, Mellon was paid a fee at the annual rate of .20% of
 
10
<PAGE>
 
--------------------------------------------------------------------------------


the average daily net assets of the Portfolio. Prior to October 3, 1994 Duff &
Phelps Investment Management Company ("Duff & Phelps") served as the investment
advisor to the Large Cap Value Portfolio, and was party to an investment advi-
sory agreement with the Trust dated October 22, 1992. Under the investment ad-
visory agreement, Duff & Phelps was paid a fee at the annual rate of .20% of
the average daily net assets of the Portfolio. For the period ended March 31,
1995, Duff & Phelps and Mellon received $2,000 and $37,000, respectively as
compensation for their services as investment adviser to the Portfolio.
  Merus Capital Management ("Merus") serves as an investment sub-adviser to a
portion of the assets of the Large Cap Value Portfolio, and is party to an in-
vestment sub-advisory agreement with the Trust and SFM dated December 16, 1994.
Under the investment sub-advisory agreement, Merus receives an annual fee of
 .20% of the average monthly market value of investments under its management.
  American Express Financial Corporation, formerly known as IDS Advisory Group
Inc., serves as an investment sub-adviser to a portion of the assets of the
Large Cap Growth Portfolio and is party to an investment sub-advisory agreement
with the Trust and SFM dated December 16, 1994. Under the investment sub-advi-
sory agreement, American Express Financial Corporation is entitled to an annual
fee of the greater of $125,000 or a fee paid monthly by SFM at an annual rate
of .25% of the average monthly market value of investments under its manage-
ment.
  Alliance Capital Management L.P. ("Alliance") serves as an investment sub-ad-
viser to a portion of the assets of the Large Cap Growth Portfolio and is party
to an investment sub-advisory agreement with the Trust dated December 16, 1994.
Under the investment sub-advisory agreement, Alliance is entitled to the
greater of $125,000 or a fee paid monthly by SFM at an annual rate of .25% of
the average monthly market value of investments under its management.
  1838 Investment Advisors, L.P. ("1838") serves as an investment sub-adviser
for the Small Cap Value Portfolio and is party to an investment sub-advisory
agreement with the Trust dated December 16, 1994. Under the investment sub-ad-
visory agreement, 1838 receives an annual fee of .50% of the average monthly
market value of investments under its management.
  Investment Advisers, Inc., Nicholas-Applegate Capital Management, and Pilgrim
Baxter & Associates, the advisers of the Small Cap Growth Portfolio, are par-
ties to investment advisory agreements with the Trust dated July 1, 1993. Under
the agreements, the Advisers receive an annual fee of .50% of the average daily
net assets of the portion of the Portfolio that they advise. For the period
ended March 31, 1995, Investment Advisers, Inc. Nicholas-Applegate Capital Man-
agement, and Pilgrim Baxter & Associates, received $232,020, $230,240 and
$237,614, respectively in connection with the aforementioned agreements.
  Nicholas-Applegate Capital Management, the Adviser of the Mid-Cap Growth
Portfolio, is a party to an investment advisory agreement with the Trust dated
November 16, 1992. Under the investment advisory agreement, Nicholas-Applegate
Capital Management receives an annual fee of .45% of the first $100,000,000 of
the Portfolio's average daily net assets and .40% of the average daily net as-
sets in excess of $100,000,000.
  SunBank Capital Management, N.A., the adviser of the Capital Appreciation,
Capital Growth, and Balanced Portfolios, is a party to investment advisory
agreements with the Trust dated September 9, 1987 for the Capital Appreciation
and Capital Growth Portfolios, and September 6, 1992, for the Balanced Portfo-
lio. Under the investment advisory agreements, SunBank Capital Management, N.A.
receives an annual fee of .25% of the average daily net assets of the Capital
Appreciation and Balanced Portfolios. SunBank is not paid a fee by the Trust
for the investment advisory services connected with the Capital Growth Portfo-
lio.
  Merus Capital Management ("Merus"), serves as investment advisor for the Eq-
uity Income Portfolio, and is party to an investment advisory agreement with
the Trust dated September 24, 1987. Under the investment advisory agreement,
Merus receives an annual fee of .25% of the average daily
 
                                                                              11
<PAGE>
 
NOTES TO FINANCIAL STATEMENTS (Continued)
--------------------------------------------------------------------------------
SEI Institutional Managed Trust -- March 31, 1995 (Unaudited)


net assets of the Equity Income Portfolio. The Manager and Merus have agreed to
waive their fees proportionately so that the total annual expenses of the Port-
folio will not exceed the lower of the maximum limitations established by cer-
tain states or voluntary expense limitations adopted by the Manager
  Western Asset Management, the adviser of the Core Fixed Income Portfolio, and
Boatmen's Trust Company, the adviser of the Bond Portfolio, are parties to an
investment advisory agreements dated January 19, 1994 and December 29, 1988,
respectively. Under the investment advisory agreements, each adviser receives
an annual fee of .125% of the average daily net assets of the Portfolio.
  CS First Boston Investment Management Corporation ("CS First Boston") serves
as investment sub-adviser to the High Yield Bond Portfolio and is party to an
investment sub-advisory agreement with the Trust dated December 16, 1994. Under
the sub-advisory agreement, CS First Boston is entitled to a fee--paid monthly
by SFM--of .3375% of the average monthly market value of investments under its
management.
  SEI Financial Services Company (the "Distributor"), a wholly-owned subsidiary
of SEI Corporation and a registered broker-dealer, acts as the distributor of
the shares of the Trust under a distribution plan which provides for the Trust
to reimburse the Distributor for distribution expenses. Such expenses may not
exceed .30% of the average daily net assets of the Trust's Class A shares. Dis-
tribution expenses include, among other items, the compensation and benefits of
sales personnel incurred by the Distributor in connection with the promotion
and sale of shares. Distribution expenses are allocated among the Portfolios,
on the basis of their relative average daily net assets. In addition, Portfo-
lios with Class B shares and Class D shares, have separate distribution plans
that provide for additional payments to the Distributor of .30% of each of the
Class B and Class D shares' average daily net assets.
  The Distribution Agreement between the Distributor and the Trust provides
that the Distributor may receive compensation on portfolio transactions ef-
fected for the Trust in accordance with the rules of the Securities and Ex-
change Commission ("SEC"). Accordingly, it is expected that portfolio transac-
tions may result in brokerage commissions being paid to the Distributor. The
SEC rules require that such commissions not exceed usual and customary broker-
age commissions.
 
4. ORGANIZATIONAL COSTS AND TRANSACTIONS WITH AFFILIATES
 
Organizational costs have been capitalized by the Fund and are being amortized
over sixty months commencing with operations. In the event any of the initial
shares are redeemed by any holder thereof during the period that the fund is
amortizing its organizational costs, the redemption proceeds payable to the
holder thereof by the Fund will be reduced by the unamortized organizational
costs in the same ratio as the number of initial shares being redeemed bears to
the number of initial shares outstanding at the time of the redemption.
  Certain officers and/or trustees of the Trust are also officers of the Manag-
er. The Trust pays each unaffiliated Trustee an annual fee for attendance of
quarterly, interim, and committee meetings. Compensation of officers and affil-
iated Trustees of the Trust is paid by the Manager.
  Each of the Portfolios also used the Distributor as an agent in placing re-
purchase agreements. For this service the Distributor retains a portion of the
benefit as a commission. Such commissions for repurchase agreements placed dur-
ing the period ended March 31, 1995, were nominal in the aggregate.
 
12
<PAGE>
 
--------------------------------------------------------------------------------
 
5. INVESTMENT TRANSACTIONS
 
The cost of security purchases and the proceeds from the sale of securities in-
cluding U.S. Government securities, other than temporary cash investments dur-
ing the period ended March 31, 1995, were as follows:
 
<TABLE>
<CAPTION>
                                  PURCHASES  SALES
                                    (000)    (000)
                                  --------- --------
<S>                               <C>       <C>
Large Cap Value                   $167,302  $134,750
Large Cap Growth                   133,851    12,555
Small Cap Value                     43,599    26,755
Small Cap Growth                   134,011   169,567
Mid-Cap Growth                      24,617    91,943
Capital Appreciation               292,300   557,714
Equity Income                       86,829   229,033
Balanced                            42,930    36,472
Capital Growth                      25,461    47,074
Core Fixed Income                  610,181   491,454
Bond                                37,497   110,600
High Yield Bond                      6,700       206
</TABLE>
 
  On March 31, 1995, the total cost of securities and the net realized gains or
losses on securities sold for Federal income tax purposes was not materially
different from amounts reported for financial reporting purposes. The aggregate
gross unrealized appreciation and depreciation on securities at March 31, 1995,
for each portfolio is as follows:
 
<TABLE>
<CAPTION>
                                                   NET
                                                UNREALIZED
                      APPRECIATED DEPRECIATED APPRECIATION/
                      SECURITIES  SECURITIES  (DEPRECIATION)
                         (000)       (000)        (000)
                      ----------- ----------- --------------
<S>                   <C>         <C>         <C>
Large Cap Value         $12,830     $1,642       $11,188
Large Cap Growth          7,245      1,369         5,876
Small Cap Value           2,084      1,190           894
Small Cap Growth         64,142      5,711        58,431
Mid-Cap Growth            6,932        280         6,652
Capital Appreciation     38,615     22,437        16,178
Equity Income            24,005      4,998        19,007
Balanced                  3,872      1,922         1,950
Capital Growth           12,909      5,234         7,675
Core Fixed Income         4,937      5,454          (517)
Bond                        905         34           871
High Yield Bond             145         22           123
</TABLE>
 
  The market values of the Intermediate Bond, Bond and High Yield Bond Portfo-
lios' investments will change in response to interest rate changes and other
factors. During periods of falling interest rates, the values of fixed income
securities generally rise. Conversely, during periods of rising interest rates,
the values of such securities generally decline. Changes by recognized rating
agencies in the ratings of any fixed income security and in the ability of an
issuer to make payments of interest and principal may also affect the value of
these investments.
  At March 31, 1995 the following Portfolios had available realized capital
losses to offset future net capital gains through fiscal year ended 2003.
 
<TABLE>
<CAPTION>
                                                                          (000)
                                                                         -------
<S>                                                                      <C>
Large Cap Value                                                          $ 1,397
Mid-Cap Growth                                                             7,349
Small Cap Growth                                                          17,019
Core Fixed Income                                                         11,191
</TABLE>
 
6. FUTURES CONTRACTS:
 
The Core Fixed Income Portfolio had the following bond futures contracts open
as of March 31, 1995:
 
<TABLE>
<CAPTION>
                                                                        UNREALIZED
    CONTRACT         NUMBER OF                         SETTLEMENT       GAIN/(LOSS)
   DESCRIPTION       CONTRACTS       TRADE PRICE         MONTH             (000)
   -----------       ---------       -----------       ----------       -----------
 <S>                 <C>             <C>               <C>              <C>
 US 5 Year Note
      (CBT)             373          $103.825067       June 1995           $(252)
 US 10 Year Note
      (CBT)             229           105.005595       June 1995            (253)
  US Long Bond
      (CBT)             136           105.000000       June 1995              78
  US Long Bond
      (CBT)              65           103.406250       June 1995              36
                                                                           -----
                                                                           $(391)
                                                                           =====
</TABLE>
 
7. SHAREHOLDER VOTING RESULTS:
 
There was a special meeting of shareholders on March 10, 1995 for the share-
holders of the Large Cap Value Portfolio to approve the selections of LSV Asset
Management ("LSV") as one of three investment sub-advisers of the Portfolio and
approve the investment sub-advisory agreement between SEI Financial Management
Corporation and LSV.
 
<TABLE>
<CAPTION>
                                                                 SHARES VOTED
                                                                 ------------
<S>                                                              <C>
  For                                                            8,080,158.607
Against                                                             51,233.000
Abstain                                                             69,831.000
</TABLE>
 
There were no broker non-votes submitted and no other proposals voted on at
such meeting.
 
                                                                              13


               PLEASE RETAIN THIS SUPPLEMENT FOR FUTURE REFERENCE


<PAGE>
 
                        SEI INSTITUTIONAL MANAGED TRUST
    
      SUPPLEMENT DATED JULY 11, 1995 TO PROSPECTUS DATED JANUARY 31, 1995      
    
     The Prospectus dated January 31, 1995 relating to the Core Fixed Income,
Bond and High Yield Bond Portfolios of SEI Institutional Managed Trust is hereby
amended and supplemented by the addition of the following unaudited financial
information for the period ended May 31, 1995.      

FINANCIAL HIGHLIGHTS                            SEI INSTITUTIONAL MANAGED TRUST
                                                                      UNAUDITED

For a Class A Share Outstanding Throughout the Period

<TABLE>     
<CAPTION> 
                                                                HIGH YIELD BOND PORTFOLIO
                                                   -----------------------------------------------------
                                                                 For the period ended May 31,
                                                   -----------------------------------------------------
                                                                            1995(1)
--------------------------------------------------------------------------------------------------------
 <S>                                                                        <C> 
 Net Asset Value, 
    Beginning of Period...........................                          $10.00
--------------------------------------------------------------------------------------------------------
 Income from Investment Operations:
    Net Investment Income.........................                           0.33

    Net Realized and Unrealized Gains
    on Securities.................................                           0.52
--------------------------------------------------------------------------------------------------------
    Total from Investment Operations..............                           $0.85
--------------------------------------------------------------------------------------------------------
 Less Distributions:
    Dividends from Net Investment Income..........                          (0.24)
--------------------------------------------------------------------------------------------------------
    Total Distributions...........................                          $(0.24)
--------------------------------------------------------------------------------------------------------
 Net Asset Value, End of Period...................                          $10.61
========================================================================================================
 Total Return.....................................                          8.58%
========================================================================================================
 Ratios/Supplemental Data:
 Net Assets, End of Period (000)..................                          $15,876

 Ratio of Expenses to Average Net Assets..........                          0.69%*

 Ratio of Expenses to Average Net Assets
  (Excluding Waivers).............................                          0.82%*

 Ratio of Net Investment Income to
  Average Net Assets..............................                          9.53%*

 Ratio of Net Investment Income to
  Average Net Assets (Excluding Waivers)..........                          9.40%*

 Portfolio Turnover Rate..........................                            19%
========================================================================================================
</TABLE>       
    
* Annualized      
    
(1) High Yield Bond shares were offered beginning January 11, 1995.      


              PLEASE RETAIN THIS SUPPLEMENT FOR FUTURE REFERENCE

                                      (v)
<PAGE>
 
     
The Prospectus for the Large Cap Value, Small Cap Growth, Capital Appreciation,
Equity Income, Balanced, Mid-Cap Growth, Capital Growth and Real Estate
Securities Portfolios, Institutional Class shares, is incorporated by reference
to Post-Effective Amendment No. 21 to the Registrant's Registration Statement on
Form N-1A (File Nos. 33-9504 and 811-4878) filed with the SEC on November 29,
1994.      
    
The Prospectus for the Large Cap Growth and Small Cap Value Portfolios,
Institutional Class shares, is incorporated by reference to Post-Effective
Amendment No. 20 to the Registrant's Registration Statement on Form N-1A (File
Nos. 33-9504 and 811-4878) filed with the SEC on October 7, 1994.      

The Prospectus for the Core Fixed Income (formerly, the Intermediate Bond
Portfolio) and Bond Portfolios, Class D shares, is incorporated by reference to
Post-Effective Amendment No. 21 to the Registrant's Registration Statement on
Form N-1A (File Nos. 33-9504 and 811-4878) filed with the SEC on November 29,
1994.

The Prospectus for the High Yield Bond Portfolio, Class D shares, is
incorporated by reference to Post-Effective Amendment No. 20 to the Registrant's
Registration Statement on Form N-1A (File Nos. 33-9504 and 811-4878) filed with
the SEC on October 7, 1994.

The Prospectus for the Large Cap Value, Small Cap Growth, Capital Appreciation,
Equity Income, Balanced and Mid-Cap Growth Portfolios, Class D shares, is
incorporated by reference to Post-Effective Amendment No. 19 to the Registrant's
Registration Statement on Form N-1A (File Nos. 33-9504 and 811-4878) filed with
the SEC on November 29, 1994.

The Prospectus for the Large Cap Growth and Small Cap Value Portfolios, Class D
shares, is incorporated by reference to Post-Effective Amendment No. 20 to the
Registrant's Registration Statement on Form N-1A (File Nos. 33-9504 and 811-
4878) filed with the SEC on October 7, 1994.
    
The Statement of Additional Information is incorporated by reference to Post-
Effective Amendment No. 21 to the Registrant's Registration Statement on Form N-
1A (File Nos. 33-9504 and 811-4878) filed with the SEC on November 29, 1994,
except for the unaudited financial statements for the High Yield Bond Portfolio,
for the period ended May 31, 1995, which are included herein.      

                                     (vi)
<PAGE>
 
<TABLE> 
<CAPTION> 
 
Statement of Net Assets                          SEI Institutional Managed Trust
May 31, 1995                                                           Unaudited
Face                                                                      Market
Amount                                                                     Value
(000)    HIGH YIELD BOND PORTFOLIO                                         (000)
--------------------------------------------------------------------------------
         Corporate Obligations (85.8%)    
--------------------------------------------------------------------------------
<S>      <C>                                                    <C> 
         Abbey Healthcare Group                
$    65     9.500%, 11/01/02 .................................. $            67
         Adelphia Communications
    100     12.500%, 05/15/02 .................................             100
         AK Steel
    100     10.750%, 04/01/04 .................................             106
         Allied Waste Industries
     50     12.000%, 02/01/04 .................................              52
         American Restaurant Group
    100     12.000%, 09/15/98 .................................              87
         American Standard
     20     11.375%, 05/15/04 .................................              22
    250     Zero Coupon, 06/01/05 (B) .........................             188
         Amerigas Partner
    100     10.125%, 04/15/07 (A) .............................             103
         Arcadian Partner
    100     10.750%, 05/01/05 .................................             102
         Armco
    100     11.375%, 10/15/99 .................................             104
         Atlantis Group
     50     11.000%, 02/15/03 .................................              51
         Bally's Casino Holding
    100     Zero Coupon, 06/15/98 (B) .........................              68
         Bally's Grand
    100     10.375%, 12/15/03 .................................              98
         Bally's Health & Tennis
    100     13.000%, 01/15/03 .................................              84
         Bally's Park Place Funding
    150     9.250%, 03/15/04 ..................................             139
         Bayou Steel
    100     10.250%, 03/01/01 .................................              95
         Bell Cablemedia
    300     Zero Coupon, 07/15/04 (B) .........................             195
         Big V Supermarkets
     75     11.000%, 02/15/04 .................................              66
         Building Materials
    300     Zero Coupon, 07/01/04 (B) .........................             183
         Cablevision Industries
     50     9.250%, 04/01/08 ..................................              51
         Cablevision Systems
     50     9.875%, 02/15/13 ..................................              51
         Casino America
    100     11.500%, 11/15/01 .................................             100
         Centennial Cellular
    250     10.125%, 05/15/05 .................................             250

</TABLE> 
<PAGE>
 
<TABLE> 
<CAPTION> 
 
Statement of Net Assets                          SEI Institutional Managed Trust
May 31, 1995                                                           Unaudited
Face                                                                      Market
Amount                                                                     Value
(000)    HIGH YIELD BOND PORTFOLIO                                         (000)
--------------------------------------------------------------------------------
<S>      <C>                                                    <C>  
         CF Cable Television
$    50     11.625%, 02/15/05 ................................. $            53
         Cole National
    250     11.250%, 10/01/01 .................................             240
         Comcast
     50     9.500%, 01/15/08 ..................................              49
     50     10.625%, 07/15/12 .................................              53
         Container
     50     9.750%, 04/01/03 ..................................              51
         Continental Cablevision
    100     11.000%, 06/01/07 .................................             110
         Continental Medsystems
    150     10.875%, 08/15/02 .................................             155
     50     10.375%, 04/01/03 .................................              51
         Coty
    100     10.250%, 05/01/05 .................................             103
         County Seat Stores
    100     12.000%, 10/01/01 .................................             100
         Crown Packaging Holdings
    300     Zero Coupon, 11/01/03 (B) .........................             150
         Dairy Mart Convenience Stores
    200     10.250%, 03/15/04 .................................             170
         Diamond Cable Communication
    100     Zero Coupon, 09/30/04 (B) .........................              62
         Doman Industries
    250     8.750%, 03/15/04 ..................................             237
         Domtar
    100     11.250%, 09/15/17 .................................             108
         Doskocil Cosmetics
    100     9.750%, 07/15/00 ..................................              95
         Duane Reade
    250     12.000%, 09/15/02 .................................             215
         Exide
    100     10.000%, 04/15/05 (A) .............................             102
         Falcon Drilling
    100     9.750%, 01/15/01 ..................................              98
         Farm Fresh
     50     12.250%, 10/01/00 .................................              48
         Farm Fresh, Ser A
    200     12.250%, 10/01/00 .................................             193
         Finlay Enterprises
     50     Zero Coupon, 05/01/05 (B) .........................              32
         Fort Howard
    150     9.000%, 02/01/06 ..................................             139
         G-I Holdings
    250     Zero Coupon, 10/01/98 (B) .........................             173
         Gaylord Container
     50     11.500%, 05/15/01 .................................              53

</TABLE> 
<PAGE>
 
<TABLE> 
<CAPTION> 
 
Statement of Net Assets                          SEI Institutional Managed Trust
May 31, 1995                                                           Unaudited
Face                                                                      Market
Amount                                                                     Value
(000)    HIGH YIELD BOND PORTFOLIO                                         (000)
--------------------------------------------------------------------------------
<S>      <C>                                                    <C> 
         General Media
$   100     10.625%, 12/31/00 ................................. $            84
         Geneva Steel
    250     9.500%, 01/15/04 ..................................             203
         GNF
    200     10.625%, 04/01/03 .................................             165
         GPA Delaware
     75     8.750%, 12/15/98 ..................................              61
         Great Bay Property Funding
    105     10.875%, 01/15/04 .................................              91
         Groupe Videotron
    100     10.625%, 02/15/05 .................................             106
         Grupo Industrial Durango
    100     12.000%, 07/15/01 .................................              76
         GS Technologies
    100     12.000%, 09/01/04 .................................             102
         Gulf Canada Resources
    100     9.250%, 01/15/04 ..................................              99
         Harris Chemical
     75     Zero Coupon, 07/15/01 (B) .........................              68
         Healthtrust
    100     10.750%, 05/01/02 .................................             111
         Helicon Group
    150     9.000%, 11/01/03 ..................................             138
         Hills Stores
    250     10.250%, 09/30/03 .................................             244
         Hollywood Casino
    100     14.000%, 04/01/98 .................................             109
         Host Marriott Hospitality
     53     10.625%, 02/01/00 .................................              55
         IMAX
    100     7.000%, 03/01/01 ..................................              91
         Integrated Health Services
    250     9.625%, 05/31/02 (A) ..............................             253
         Interlake
    200     12.125%, 03/01/02 .................................             203
         International Cabletel
    150     12.750%, 04/15/05 (A) .............................              85
         Ithaca Industries
    100     11.125%, 12/15/02 .................................              93
         Jones Intercable
    100     9.625%, 03/15/02 ..................................             103
         Jordan Industries
    250     10.375%, 08/01/03 .................................             238
         JPS Automotive Products
    100     11.125%, 06/15/01 .................................             100
         K-III Communications
     50     10.625%, 05/01/02 .................................              52
</TABLE> 
<PAGE>
 
<TABLE> 
<CAPTION> 
 
Statement of Net Assets                          SEI Institutional Managed Trust
May 31, 1995                                                           Unaudited
Face                                                                      Market
Amount                                                                     Value
(000)    HIGH YIELD BOND PORTFOLIO                                         (000)
--------------------------------------------------------------------------------
<S>      <C>                                                    <C>  
         Kloster Cruise
$   150     13.000%, 05/01/03 ................................. $           127
         Malette
    100     12.250%, 07/15/04 .................................             108
         Marvel III Holdings
    100     9.125%, 02/15/98 ..................................              92
         Maxus Energy
    250     9.875%, 10/15/02 ..................................             243
         Mesa
    250     Zero Coupon, 06/30/98 (B) .........................             241
         MFS Communications
    300     Zero Coupon, 01/15/04 (B) .........................             204
         Mobile Telecommunications Technologies
     50     13.500%, 12/15/02 .................................              53
         Nextel Communications
    300     Zero Coupon, 08/15/04 (B) .........................             149
         NL Industries
    100     11.750%, 10/15/03 .................................             106
         Panamsat L.P.
     50     9.750%, 08/01/00 ..................................              51
         Pathmark Stores
    300     Zero Coupon, 11/01/03 (B) .........................             178
         Penn Traffic
    250     9.625%, 04/15/05 ..................................             237
         Petroleum Heat & Power
     50     12.250%, 02/01/05 .................................              53
         Pioneer Americas
    100     13.375%, 04/01/05 (A) .............................             105
         Platex Family Products
     50     9.000%, 02/15/03 ..................................              48
         Rainy River Forest Products
    100     10.750%, 10/15/01 .................................             106
         Red Roof Inns
     50     9.625%, 12/15/03 ..................................              49
         Repap Wisconsin
    100     9.875%, 05/01/06 ..................................              98
         Republic Engineered Steel
    150     9.875%, 12/15/01 ..................................             141
         Resorts International
    100     11.000%, 09/15/03 .................................              88
         Revlon Consumer Products
    150     9.375%, 04/01/01 ..................................             145
    100     10.500%, 02/15/03 .................................              99
         Rexene
    150     11.750%, 12/01/04 .................................             163
         Rogers Cablesystems
    100     10.000%, 03/15/05 (A) .............................             102
</TABLE> 
<PAGE>
 
<TABLE> 
<CAPTION> 
Statement of Net Assets                          SEI Institutional Managed Trust
May 31, 1995                                                           Unaudited
Face                                                                      Market
Amount                                                                     Value
(000)    HIGH YIELD BOND PORTFOLIO                                         (000)
--------------------------------------------------------------------------------
<S>      <C>                                                    <C>          
         Santa Fe Energy Resource          
$    50     11.000%, 05/15/04 ................................. $            53
         SCI Television
     50     11.000%, 06/30/05 .................................              52
         Sherritt
    100     10.500%, 03/31/14 .................................             100
         Showboat
    100     9.250%, 05/01/08 ..................................              93
         Speicialty Equipement
    250     11.375%, 12/01/03 .................................             252
         Station Casinos
    100     9.625%, 06/01/03 ..................................              92
         Stone Consolidated
    100     10.250%, 12/15/00 .................................             104
         Stone Container
    100     9.875%, 02/01/01 ..................................             100
         Surgical Health
     50     11.500%, 07/15/04 .................................              56
         Synthetic Industries
    100     12.750%, 12/01/02 .................................             100
         Tracor
     50     10.875%, 08/15/01 .................................              52
         Transtexas Gas
    100     10.500%, 09/01/00 .................................             107
         Trump Plaza Funding
    250     10.875%, 06/15/01 .................................             229
         Trump Taj Mahal PIK
    202     11.350%, 11/15/99 .................................             150
         UCC Investors
     50     11.000%, 05/01/03 .................................              52
         United International Holding
    100     Zero Coupon, 11/15/99 .............................              58
         US Leather
    100     10.250%, 07/31/03 .................................              87
         USG
     50     9.250%, 09/15/01 ..................................              51
         Venture Holdings Trust
    250     9.750%, 04/01/04 ..................................             218
         Viacom International
    100     8.000%, 07/01/06 ..................................              97
         Waban
    250     11.000%, 05/15/04 .................................             253
         WCI Steel
    100     10.500%, 03/01/02 .................................             102
         Wright Medical Technology
     50     10.750%, 07/01/01 .................................              50
--------------------------------------------------------------------------------
               Total Corporate Obligations
                 (Cost $13,251[000]) ..........................          13,626
--------------------------------------------------------------------------------
</TABLE> 
<PAGE>
 
<TABLE> 
<CAPTION> 
Statement of Net Assets                          SEI Institutional Managed Trust
May 31, 1995                                                           Unaudited
Face                                                                      Market
Amount                                                                     Value
(000)    HIGH YIELD BOND PORTFOLIO                                         (000)
--------------------------------------------------------------------------------
         Units (4.8%)    
--------------------------------------------------------------------------------
<S>      <C>                                                    <C> 
         Commodore Media 1 Unit = 1 Senior Subordinate Note 
            + 1 Warrant
$   100     7.500%, 05/01/03 (A) .............................. $            88
         Gulf States Steel 1 Unit= 1 Bond + 1 Warrant
    100     13.500%, 04/15/03 (A) .............................             102
         Health O Meter 1 Unit = 1 Senior Subordinate Note
            + 1 Warrant = 10.96 Shares Common Stock
    100     13.000%, 08/15/02 .................................              94
         In Flight Phone 1 Unit = 1 Note + 1 Warrant
    100     Zero Coupon, 05/15/02 (A) .........................              66
         MVE 1 Unit = 1 Senior Note + 1 Warrant
    100     12.500%, 02/15/02 .................................             106
         People's Choice TV 1 Unit = 1 Senior Discount Note
            + 1 Warrant = 1.427 Shares Common Stock
    400     Zero Coupon, 06/01/04 (B) .........................             209
         Santa Fe Hotel 1 Unit = 1 10,000 First Mortgage
            Note + 1 Warrant
    100     11.000%, 12/15/00 .................................              96
--------------------------------------------------------------------------------
               Total Units 
                  (Cost $753[000]) ............................             761
--------------------------------------------------------------------------------

Shares
--------------------------------------------------------------------------------
         Warrants (0.0%)    
--------------------------------------------------------------------------------
     21  Wright Medical Technology ............................               3
--------------------------------------------------------------------------------
               Total Warrants
                  (Cost $3[000]) ..............................               3
--------------------------------------------------------------------------------
         Common Stock (0.0%)
--------------------------------------------------------------------------------
     66  Finlay Enterprises ...................................               1
               Total Common Stock
                  (Cost $1[000]) ..............................               1
--------------------------------------------------------------------------------
Face 
Amount 
(000)
--------------------------------------------------------------------------------
</TABLE> 

<PAGE>
 
<TABLE> 
<CAPTION> 
Statement of Net Assets                          SEI Institutional Managed Trust
May 31, 1995                                                           Unaudited
Face                                                                      Market
Amount                                                                     Value
(000)    HIGH YIELD BOND PORTFOLIO                                         (000)
--------------------------------------------------------------------------------
         Repurchase Agreement (10.8%)    
--------------------------------------------------------------------------------
<S>      <C>                                                    <C> 
$ 1,708  Sanwa Securities 6.05%, dated 5/31/95, matures
            06/01/95, repurchase price
            $1,708,287(collateralized by U.S. Treasury Note,
            par value $1,714,000, 6.500%, 04/30/97, market
            value:$1,752,000) ................................. $         1,708
--------------------------------------------------------------------------------
               Total Repurchase Agreement
                  (Cost $1,708[000]) ..........................           1,708
--------------------------------------------------------------------------------
         Total Investments (101.4%)
               (Cost $15,716[000]) ............................          16,099
--------------------------------------------------------------------------------
         Other Assets and Liabilities (-1.4%)
--------------------------------------------------------------------------------
          Other Assets and Liabilities, Net ...................            (223)
--------------------------------------------------------------------------------
         Total Other Assets and Liabilities ...................            (223)
--------------------------------------------------------------------------------
         Net Assets:
         Portfolio shares of Class A (unlimited
           authorization -- no par value) based on 1,496,212
           outstanding shares of beneficial interest ..........          15,346
         Undistributed net investment income ..................             128
         Accumulated net realized gain on investments .........              19
         Net unrealized appreciation on investments ...........             383
--------------------------------------------------------------------------------
         Total Net Assets: (100.0%) ........................... $        15,876
--------------------------------------------------------------------------------
         Net Asset Value, Offering and Redemption Price Per
           Share -- Class A ................................... $         10.61
--------------------------------------------------------------------------------
</TABLE> 

          (A) Security exempt from registration under Rule 144A of the
          Securities Act of 1933. This security may be resold only in
          transactions exempt from registration, normally to qualified
          institutional buyers.

          (B) Step Bond -the rate reflected on the Statement of Net Assets is
          the rate in effect on May 31, 1995. The initial coupon on a step bond
          changes on a specific date, to a predetermined higher rate.

          LP -Limited partnership

          PIK -Payment in Kind

          Ser -Series

   The accompanying notes are an integral part of the financial statements.
 
<PAGE>
 
           SEI INSTITUTIONAL MANAGED TRUST HIGH YIELD BOND PORTFOLIO
                            STATEMENT OF OPERATIONS
                    JANUARY 11, 1995 THROUGH MAY 31, 1995*
                                  (Unaudited)

<TABLE> 
<CAPTION> 


Investment Income:                                       (000)
                                                       ---------
<S>                                                    <C> 
     Interest                                              $320
                                                       ---------
Expenses:
     Management fees                                         11
     Less management fees waived                             (4)
     Investment advisory fees                                10
     Custodian/wire agent fees                                1
     Registration & filing fees                               1
     Printing  expense                                        1
     Distribution fees                                        1
     Amortization of deferred
       organization costs                                     1
                                                       ---------
     Total expenses                                          22
                                                       ---------
Net investment income                                       298
                                                       ---------
Net realized and unrealized gain
  on investments.
     Net Realized Gain From
       Securities Sold                                       19
     Net Change in Unrealized Apreciation
       on Investments                                       383
                                                       ---------
Net increase in net assets from
  operations.                                              $700
                                                       =========
</TABLE> 

*  Shares were offered beginning January 11, 1995.

   The accompanying notes are an integral part of the financial statements.
<PAGE>
 
           SEI INSTITUTIONAL MANAGED TRUST HIGH YIELD BOND PORTFOLIO
                       STATEMENT OF CHANGE IN NET ASSETS
                    JANUARY 11, 1995 THROUGH MAY 31, 1995 *
                                  (Unaudited)


<TABLE> 


Operations:                                                      (000)
                                                              -----------
<S>                                                           <C> 
  Net Investment Income (Loss)                                      $298
  Net realized gain (loss) from security transactions                 19
  Net realized appreciation (depreciation) on investments            383
                                                              -----------
  Net increase in net assets resulting from operations               700
                                                              -----------
Dividends distributed from:
  Net investment income:
    Class A                                                         (170)
                                                              -----------
Capital share transactions:
  Class A:
    Proceeds from shares issued                                   15,299
    Shares issued in lieu of cash distributions                      167
    Cost of shares repurchased                                      (120)
                                                              -----------
    Increase in net assets derived from Class A transactions      15,346
                                                              -----------
  Net increase in net assets                                      15,876
                                                              -----------
Net assets:
  Beginning of period                                                -
                                                              -----------
  End of period                                                  $15,876
                                                              ===========
Capital share transactions:
  Class A:
    Shares issued                                                  1,492
    Shares issued in lieu of cash distributions                       16
    Shares repurchased                                               (12)
                                                              -----------
       Total Class A transactions                                  1,496
                                                              -----------
</TABLE> 
*  Shares were offered beginning January 11, 1995.


   The accompanying notes are an integral part of the financial statements.
<PAGE>
 
           SEI INSTITUTIONAL MANAGED TRUST HIGH YIELD BOND PORTFOLIO
                             FINANCIAL HIGHLIGHTS
                   JANUARY 11, 1995 THROUGH MAY 31, 1995**
                                  (Unaudited)
<TABLE> 

For a share outstanding throughout the period.
<S>                                                  <C> 
Net asset value beginning of period                  $10.00
  Income from investment operations:
   Net investment income                               0.33
   Net realized and unrealized gain on securities      0.52
                                                       ----
  Total from investment operations                     0.85
                                                       ----
   Dividends from net investment income               (0.24)
                                                       ----
Net asset value end of period                        $10.61
                                                     ------
Total Return                                           8.58%

Net assets end of period                            $15,876

Ratio of expenses to average net assets                0.69%* 

Ratio of net investment income to average net assets   9.53%*

Ratio of expenses to average net assets 
  (excluding waivers)                                  0.82%*

Ratio of net investment income to average
  net assets (excluding waivers)                       9.40%*

Portfolio turnover rate                                  19%
</TABLE> 

*  Annualized
**  Shares were offered beginning January 11, 1995.

    The accompanying notes are an integral part of the financial statements
<PAGE>
 
NOTES TO THE FINANCIAL STATEMENTS:
(Unaudited)

1.  Organization

SEI Institutional Managed Trust (the "Trust") is organized as a Massachusetts
business trust under a Declaration of Trust dated October 20, 1986.

2.  Significant Accounting Policies

The Trust is registered under the Investment Company Act of 1940, as amended, as
an open-end investment company with twelve diversified portfolios and one non-
diversified portfolio (the "Portfolios"):  Large Cap Value, Large Cap Growth,
Small Cap Value, Small Cap Growth, Mid-Cap Growth, Capital Appreciation, Equity
Income, Balanced, Capital Growth, Core Fixed Income, Bond, and High Yield Bond.
The Real Estate Securities Portfolio had not commenced as of May 31, 1995.  The
Trust is registered to offer Class A, Class B and Class D shares of the Large
Cap Value, Large Cap Growth, Small Cap Value, Small Cap Growth, Mid-Cap Growth,
Capital Appreciation, Equity Income, Balanced, Core Fixed Income, Bond, and High
Yield Bond Portfolios.  The following is a summary of the significant accounting
policies followed by the High Yield Bond Portfolio of the Trust.

     Security Valuation -- Investments in equity securities which are traded on
a national securities exchange (or reported on NASDAQ national market system)
are stated at the last quoted sales price if readily available for such equity
securities on each business day; other equity securities traded in the over-the-
counter market and listed equity securities for which no sale was reported on
that date are stated at the last quoted bid price.  Debt obligations with
remaining maturities in excess of sixty days are valued at the most recently
quoted bid price.  Debt obligations with remaining maturities of sixty days or
less are valued at their amortized cost.

     Federal Income Taxes -- The High Yield Bond Portfolio intends to qualify as
a regulated investment company for Federal income tax purposes and distribute
all of its taxable income (including net capital gains).  Accordingly no
provision for Federal income taxes is required.

     Net Asset Value Per Share -- Net asset value per share is calculated on a
daily basis by dividing the assets of the High Yield Bond Portfolio less its
liabilities by the number of outstanding shares of the Portfolio.

     Repurchase Agreements -- Securities pledged as collateral for repurchase
agreements are held by the High Yield Bond Portfolio's custodian bank until
maturity of the Repurchase Agreement.  Provisions of the Agreement and
procedures adopted by the Manager and the Advisers of the Trust ensure that the
market value of the collateral, including accrued interest thereon, is
sufficient in the event of default by the counterparty.  If the counterparty
defaults and the value of collateral declines or if the counterparty enters into
an insolvency proceeding, realization of the collateral by the Portfolios may be
delayed or limited.

     Discount and Premium Amortization -- All amortization is calculated using
the effective interest method over the holding period of the security.
Amortization of premiums and discounts is included in interest income.

     Classes -- Class-specific expenses are borne by that class of shares.
Income, expenses, and realized and unrealized gains/losses are allocated to the
respective classes on the basis of relative daily net assets.

     Distributions -- Distributions from net investment income are paid to
Shareholders monthly for the High Yield Bond Portfolio.  Any net realized
capital gains on the sales of securities by a Portfolio are distributed annually
to the Shareholders of the High Yield Bond Portfolio.

     Other -- Security transactions are recorded on the trade date of the
security purchase or sale.  Cost used in determining net realized capital gains
and losses on the sale of securities are those of the specific securities sold.
Dividend income is recognized on the ex-dividend date, and the interest income
is recognized on the accrual basis.

3.  Management, Investment Advisory, and Distribution Agreements
<PAGE>
 
     The Trust and SEI Financial Management Corporation (the "Manager"), a
wholly-owned subsidiary of SEI Corporation, are parties to a management
agreement (the "Agreement") dated January 22, 1987.  Under this agreement, the
Manager provides management, administrative, and shareholder servicing for an
annual fee of .35% of the average daily net assets of the High Yield Bond
Portfolio.  The Manger has agreed to waive its fee so that the total annual
expenses of each portfolio will not exceed the lower of the maximum limitations
established by certain states or voluntary expense limitations adopted by the
Manager.  In the event that the total annual expenses of a Portfolio, after
reflecting a waiver of all fees by the Manager, exceed the specific limitation,
the Manager has agreed to bear such excess.

     As of December 16, 1994, SEI Financial Management ("SFM") serves as the
investment advisor to the High Yield Bond Portfolio pursuant to an investment
advisory agreement with the Trust.  For its services, SFM receives a fee of
 .4875% of the average daily net assets of the High Yield Bond Portfolio.  For
the period ended May 31, 1995 SFM received $10,000 as compensation for its
services as investment adviser to the High Yield Bond Portfolio.

     BEA Associates ("BEA") serves as investment sub-adviser to the Portfolio
and is party to an investment sub-advisory agreement with the Trust dated April
24, 1995.  Currently, BEA receives no fee for its services as investment sub-
adviser, however, if BEA is approved by a shareholder vote as investment sub-
adviser to the High Yield Bond Portfolio, BEA will be entitled to a fee paid
monthly by SFM of .3375% of the average monthly market value of investments
under its management.  Prior to April 24, 1995, CS First Boston Investment
Management Corporation ("CS First Boston") acted as investment sub-advisor to
the High Yield Bond Portfolio under an agreement with the Trust dated December
16, 1994.  Under this agreement CS First Boston was entitled to a fee paid
monthly by SFM of .3375% of the average monthly market value of investments
under its management

     SEI Financial Services Company (the "Distributor"), a wholly-owned
subsidiary of SEI Corporation and a registered broker-dealer, acts as the
distributor of shares of the Trust under a distribution plan which provides for
the Trust to reimburse the Distributor  for distribution expenses.  Such
expenses may not exceed .30% of the average daily net assets of the Trust's
Class A shares.  Distribution expenses include, among other items, the
compensation and benefits of sales personnel incurred by the Distributor in
connection with the promotion and sale of shares.  Distribution expenses are
allocated among the Portfolios on the basis of their relative average net
assets.  In addition, Portfolios with Class B shares and Class D shares have
separate distribution plans that provide for additional payments to the
Distributor of .30% of each of the Class B and Class D shares average daily net
assets.

     The Distribution Agreement between the Distributor and the Trust provides
that the Distributor may receive compensation on portfolio transactions effected
for the Trust in accordance with the rules of the Securities and Exchange
Commission ("SEC").  Accordingly, it is expected that portfolio transactions may
result in brokerage commissions being paid to the Distributor.  The SEC rules
require that such commissions not exceed usual and customary commissions.

4.  Organizational Costs and Transactions with Affiliates

     Organizational costs have been capitalized by the Portfolio and are being
amortized over sixty months commencing with operations.  In the event any of the
initial shares are redeemed by any holder thereof during the period that the
portfolio is amortizing its organizational costs, the redemption proceeds
payable to the holder thereof by the Portfolio will be reduced by the
unamortized organizational costs in the same ratio as the number of initial
shares outstanding at the time of the redemption.

     Certain officers and/or trustees of the Trust are also officers of the
Manager.  The Trust pays each unaffiliated Trustee an annual fee for attendance
of quarterly, interim and committee meetings.  Compensation of officers and
affiliated Trustees of the Trust is paid by the Manager.

5.  Investment Transactions

     The cost of security purchases and proceeds from the sale of securities
including US Government securities, other than temporary cash investments during
the period ended May 31, 1995 were as follows:
<PAGE>
 
<TABLE>
<CAPTION> 
                    Purchases                            Sales
                      (000)                              (000)
                 ---------------------------------------------------
<S>                 <C>                                  <C> 
High Yield Bond      $15,380                             $1,421
</TABLE>

     On May 31, 1995, the total cost of securities and the net realized gains or
losses on securities sold for Federal income tax purposes was not materially
different from amounts reported for financial reporting purposes.  The aggregate
gross unrealized appreciation and depreciation on securities at May 31, 1995 is
as follows:

<TABLE>
<CAPTION> 
                              Appreciated      Depreciated     Net Unrealized
                              Securities       Securities      Appreciation/
                                 (000)            (000)        (Depreciation)
                                                                    (000)
                           ---------------------------------------------------
<S>                           <C>              <C>             <C> 
High Yield Bond                   462               79               383
</TABLE>

     The market values of the High Yield Bond Portfolio's investments will
change in response to interest rate changes and other factors.  During periods
of falling interest rates, the values of fixed income securities generally rise.
Conversely, during periods of rising interest rates, the values of such
securities generally decline.  Changes by recognized rating agencies in the
ratings of any fixed income security and in the ability of an issuer to make
payments of interest and principal may also affect the value of these
investments.

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