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<PAGE> PAGE 3
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<PAGE> PAGE 5
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<PAGE> PAGE 7
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<PAGE> PAGE 12
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<PAGE> PAGE 13
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<PAGE> PAGE 15
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<PAGE> PAGE 16
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<PAGE> PAGE 17
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<PAGE> PAGE 18
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<PAGE> PAGE 20
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<PAGE> PAGE 21
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<PAGE> PAGE 22
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<PAGE> PAGE 23
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<PAGE> PAGE 24
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<PAGE> PAGE 25
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<PAGE> PAGE 26
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<PAGE> PAGE 27
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<PAGE> PAGE 28
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<PAGE> PAGE 29
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<PAGE> PAGE 30
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<PAGE> PAGE 31
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<PAGE> PAGE 32
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<PAGE> PAGE 33
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<PAGE> PAGE 34
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<PAGE> PAGE 35
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<PAGE> PAGE 36
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<PAGE> PAGE 37
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<PAGE> PAGE 38
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<PAGE> PAGE 39
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<PAGE> PAGE 40
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<PAGE> PAGE 41
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</TABLE>
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<SERIES>
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<NAME> MFS INSTITUTIONAL RESEARCH FUND
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<NAME> MFS INSTITUTIONAL EMERGING EQUITIES FUND
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<NAME> MFS INSTITUTIONAL GLOBAL FIXED INCOME FUND
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INDEPENDENT AUDITORS' REPORT
To the Trustees and Shareholders of MFS Institutional Trust:
In planning and performing our audits of the financial statements of MFS
Institutional Trust (comprised of MFS Institutional Core Equity Fund, MFS
Institutional Core Fixed Income Fund, MFS Institutional Emerging Equities Fund,
MFS Institutional Emerging Markets Debt Fund, MFS Institutional Global Fixed
Income Fund, MFS Institutional High Yield Fund, MFS Institutional International
Equity Fund, MFS Institutional Large Cap Growth Fund, MFS Institutional Mid Cap
Growth Fund, and MFS Institutional Research Fund) (the "Trust") for the year
ended June 30, 1999 (on which we have issued our reports dated August 6, 1999),
we considered its internal control, including control activities for
safeguarding securities, in order to determine our auditing procedures for the
purpose of expressing our opinions on the financial statements and to comply
with the requirements of Form N-SAR, and not to provide assurance on the Trust's
internal control.
The management of the Trust is responsible for establishing and maintaining
internal control. In fulfilling this responsibility, estimates and judgments by
management are required to assess the expected benefits and related costs of
controls. Generally, controls that are relevant to an audit pertain to the
entity's objective of preparing financial statements for external purposes that
are fairly presented in conformity with generally accepted accounting
principles. Those controls include the safeguarding of assets against
unauthorized acquisition, use or disposition.
Because of inherent limitations in any internal control, misstatements due to
error or fraud may occur and not be detected. Also, projections of any
evaluation of internal control to future periods are subject to the risk that
the internal control may become inadequate because of changes in conditions or
that the degree of compliance with policies or procedures deteriorates.
Our consideration of the Trust's internal control would not necessarily disclose
all matters in internal control 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 one or
more of the internal control components does not reduce to a relatively low
level the risk that misstatements caused by error or fraud 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
Trust's internal control and its operation, including controls for safeguarding
securities that we consider to be material weaknesses as defined above as of
June 30, 1999.
This report is intended solely for the information and use of management, the
Board of Trustees, and the Securities and Exchange Commission and is not
intended to be and should not be used by anyone other than these specified
parties.
Deloitte & Touche LLP
Boston, Massachusetts
August 6, 1999
SUB-ITEM 77D
MFS Institutional Trust ("MFSIT")
on behalf of :
MFS Institutional Emerging Markets Debt Fund ("EFI")
EFI changed the percentage of its total assets invested in "...fixed income
securities of government, government-related, supranational and corporate
issuers located or primarily conducting their business in emerging market
countries" and "until... net assets of the Fund reach $10 million...forward
foreign currency exchange contracts" from 80% to 65% as described in the January
28, 1999 Supplement to the Prospectus, as filed under Rule 497(e) (File Nos.
33-37615 and 811-6174) with the Securities and Exchange Commission via EDGAR on
January 29, 1999. This document is hereby incorporated to this filing by
reference.
32721
SUB-ITEM 77H
As of June 30, 1999, the following person or entity owns more than 25% of a
fund's voting security:
<TABLE>
<CAPTION>
PERSON/ENTITY FUND PERCENTAGE
<S> <C> <C>
Trustees of the MFS Pension Plan EFI/ 29 33.09%
MFS Fund Distributors, Inc. EFI/ 29 61.70%
Common Balanced Fund of the Joint Investment Trust of Christian Church MWF/ 38 99.60%
Foundation Inc.
Boston Safe Deposit and Trust Company as Trustee for the TWA Pilots IRF/ 401 59.05%
DAP/ 401K Plan
Depauw University IMC/ 402 29.48%
The Carnegie Foundation for the Advancement of Teaching IMC/ 402 26.70%
Trustees of the MFS Pension Plan IIE/ 403 39.01%
MFS Service Center Inc./ Audit Acct Reinvest ICP/ 404 45.45%
MFS Service Center Inc./ Audit Acct Cash ICP/ 404 45.45%
MFS Fund Distributors Inc. IHY/ 405 50.00%
Angus A. MacNaughton IHY/405 49.99%
College of Saint Benedict ICE/ 406 49.65%
Mount Auburn Hospital ICE/406 25.43%
Massachusetts Financial Services Co. ILC/ 407 100%
</TABLE>
As of June 30, 1999, the following persons or entity that no longer owns 25% of
a fund's voting security:
<TABLE>
<CAPTION>
PERSON/ENTITY FUND
<S> <C>
The Northern Trust Co TTEE/ FBO Arthur Andersen IRF
MFS Fund Distributors Inc. ICE
</TABLE>
