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<PAGE> PAGE 2
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<PAGE> PAGE 9
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<PAGE> PAGE 17
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<NAME> SEI INSTITUTIONAL MANAGED TRUST
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<NAME> SEI INSTITUTIONAL MANAGED TRUST
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<CIK> 0000804239
<NAME> SEI INSTITUTIONAL MANAGED TRUST
<SERIES>
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<NAME> SMALL CAP GROWTH CLASS A
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<TABLE> <S> <C>
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<CIK> 0000804239
<NAME> SEI INSTITUTIONAL MANAGED TRUST
<SERIES>
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<NAME> SMALL CAP GROWTH CLASS D
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<TABLE> <S> <C>
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<CIK> 0000804239
<NAME> SEI INSTITUTIONAL MANAGED TRUST
<SERIES>
<NUMBER> 121
<NAME> MID CAP CLASS A
<MULTIPLIER> 1,000
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</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000804239
<NAME> SEI INSTITUTIONAL MANAGED TRUST
<SERIES>
<NUMBER> 122
<NAME> MID CAP CLASS D
<MULTIPLIER> 1,000
<S> <C>
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<PERIOD-START> OCT-01-1995
<PERIOD-END> SEP-30-1996
<INVESTMENTS-AT-COST> 21857
<INVESTMENTS-AT-VALUE> 24913
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<APPREC-INCREASE-CURRENT> 703
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<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
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<NUMBER-OF-SHARES-SOLD> 0
<NUMBER-OF-SHARES-REDEEMED> (5)
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<ACCUMULATED-NII-PRIOR> 18
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<PER-SHARE-NAV-BEGIN> 12.96
<PER-SHARE-NII> .14
<PER-SHARE-GAIN-APPREC> 1.07
<PER-SHARE-DIVIDEND> (.03)
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<PER-SHARE-NAV-END> 14.14
<EXPENSE-RATIO> 1.17
<AVG-DEBT-OUTSTANDING> 0
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</TABLE>
Report of Independent Accountants
To the Shareholders and Board of Trustees of
SEI Institutional Managed Trust
In planning and performing our audit of the financial statements of
SEI Institutional Managed Trust (the "Fund'') for the year ended September
30, 1996, we considered its internal control structure, including procedures
for safeguarding securities, in order to determine our auditing procedures
for the purposes of expressing our opinion on the financial statements
and to comply with the requirements of Form N-SAR, and not to provide
assurance on the internal control structure.
The management of the Fund is responsible for establishing and maintaining
an internal control structure. In fulfilling this responsibility, estimates and
judgments by management are required to assess the expected benefits and
related costs of internal control structure policies and procedures. Two of
the objectives of an internal control structure are to provide management
with reasonable, but not absolute, assurance that assets are appropriately
safeguarded against loss from unauthorized use or disposition and that
transactions are executed in accordance with management's authorization
and recorded properly to permit preparation of financial statements in
conformity with generally accepted accounting principles.
Because of inherent limitations in any internal control structure, errors or
irregularities may occur and not be detected. Also, projection of any evaluation
of the structure to future periods is subject to the risk that it may become
inadequate because of changes in conditions or that the effectiveness of the
design and operation may deteriorate.
Our consideration of the internal control structure would not necessarily
disclose all matters in the internal control structure that might be material
weaknesses under standards established by the American Institute of
Certified Public Accountants. A material weakness is a condition in which
the design or operation of the specific internal control structure elements
does not reduce to a relatively low level the risk that errors or irregularities
in amounts that would be material in relation to the financial statements
being audited may occur and not be detected within a timely period by
employees in the normal course of performing their assigned functions.
However, we noted no matters involving the internal control structure,
including procedures for safeguarding securities, that we consider to be
material weaknesses as defined above as of September 30, 1996.
This report is intended solely for the information and use of management
and the Securities and Exchange Commission.
/s/ Price Waterhouse LLP
PRICE WATERHOUSE LLP
Thirty South Seventeenth Street
Philadelphia, Pennsylvania
November 22, 1996
P:\ABS\SECTY\RMG\SEI\SIMT.NSA
