splayNameCherny, RimmaCERTIFICATION
Pursuant to Section 302
of the Sarbanes-Oxley Act of 2002

I, Peter (Pedro) A. Rodriguez, certify that:

1. I have reviewed this report on Form N-CSR of SEI Institutional Managed Trust;

2. Based on my knowledge, this report does not contain any untrue statement of a
material fact or omit to state a material fact necessary to make the statements
made, in light of the circumstances under which such statements were made, not
misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial
information included in this report, fairly present in all material respects the
financial condition, results of operations, changes in net assets, and cash
flows (if the financial statements are required to include a statement of cash
flows) of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officers and I are responsible for
establishing and maintaining disclosure controls and procedures (as defined in
Rule 30a-3(c) under the Investment Company Act of 1940) and internal control
over financial reporting (as defined in Rule 30a - 3(d) under the Investment
Company Act of 1940) for the registrant and have: a) designed such disclosure
controls and procedures to ensure that material information relating to the
registrant, including its consolidated subsidiaries, is made known to us by
others within those entities, particularly during the period in which this
report is being prepared;

b) Designed such internal control over financial reporting, or caused such
internal control over financial reporting to be designed under our supervision,
to provide reasonable assurance regarding the reliability of financial reporting
and the preparation of financial statements for external purposes in accordance
with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant's disclosure controls and
procedures and presented in this report our conclusions about the effectiveness
of the disclosure controls and procedures, as of a date within 90 days prior to
the filing date of this report based on such evaluation; and (d) Disclosed in
this report any change in the registrant's internal control over financial
reporting that occurred during the registrant's second fiscal half-year that has
materially affected, or is reasonably likely to materially affect, the
registrant's internal control over financial reporting;

5. The registrant's other certifying officers and I have disclosed, based on our
most recent evaluation, to the registrant's auditors and the audit committee of
the registrant's board of directors (or persons performing the equivalent
functions):





a) all significant deficiencies in the design or operation of internal controls
which could adversely affect the registrant's ability to record, process,
summarize, and report financial data and have identified for the registrant's
auditors any material weaknesses in internal controls; and b) any fraud, whether
or not material, that involves management or other employees who have a
significant role in the registrant's internal control over financial reporting.

Date: November 26, 2004



/s/ Peter (Pedro) A. Rodriguez
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Peter (Pedro) A. Rodriguez
Controller and CFO