MML SERIES INVESTMENT FUND
PRES14A, 1999-02-01
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<PAGE>
 
                                UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549

                           SCHEDULE 14A INFORMATION

          Proxy Statement Pursuant to Section 14(a) of the Securities
                             Exchange Act of 1934
        
Filed by the Registrant [X]

Filed by a Party other than the Registrant [_] 

Check the appropriate box:

[X]  Preliminary Proxy Statement         [_]  CONFIDENTIAL, FOR USE OF THE
                                              COMMISSION ONLY (AS PERMITTED BY
                                              RULE 14A-6(E)(2))

[_]  Definitive Proxy Statement 

[_]  Definitive Additional Materials 

[_]  Soliciting Material Pursuant to Section 240.14a-11(c) or Section 240.14a-12

                          MML Series investment Fund
- - --------------------------------------------------------------------------------
               (Name of Registrant as Specified In Its Charter)

                       
- - --------------------------------------------------------------------------------
   (Name of Person(s) Filing Proxy Statement, if other than the Registrant)

   
Payment of Filing Fee (Check the appropriate box):

[X]  No fee required

[_]  Fee computed on table below per Exchange Act Rules 14a-6(i)(4) and 0-11.

   
     (1) Title of each class of securities to which transaction applies:

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     (2) Aggregate number of securities to which transaction applies:

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     (3) Per unit price or other underlying value of transaction computed
         pursuant to Exchange Act Rule 0-11 (Set forth the amount on which
         the filing fee is calculated and state how it was determined):

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

  
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     (4) Proposed maximum aggregate value of transaction:

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     (5) Total fee paid:

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[_]  Fee paid previously with preliminary materials.
     
[_]  Check box if any part of the fee is offset as provided by Exchange
     Act Rule 0-11(a)(2) and identify the filing for which the offsetting fee
     was paid previously. Identify the previous filing by registration statement
     number, or the Form or Schedule and the date of its filing.
     
     (1) Amount Previously Paid:
 
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     (2) Form, Schedule or Registration Statement No.:

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     (3) Filing Party:
      
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     (4) Date Filed:

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Notes:

<PAGE>
 
                                   NOTICE OF

                        SPECIAL MEETING OF SHAREHOLDERS

                            To Be Held April 2, 1999

                                      and

                                PROXY STATEMENT

                                      for

                           MML SERIES INVESTMENT FUND

                                        
- - --------------------------------------------------------------------------------
Your vote is important. Please date, complete, and sign the enclosed Proxy 
Instruction Forms and mail them in the enclosed return envelope which requires 
no postage if mailed in the United States.
- - --------------------------------------------------------------------------------
<PAGE>
 
                           MML SERIES INVESTMENT FUND
                               1295 State Street
                        Springfield, Massachusetts 01111
                                        


                                   NOTICE OF
                        SPECIAL MEETING OF SHAREHOLDERS
                            To be Held April 2, 1999

To the Shareholders:

     A Special Meeting of Shareholders of MML Series Investment Fund (the
"Trust") will be held at the office of the Trust, 1295 State Street,
Springfield, Massachusetts, at 9:30 a.m., Springfield time, on April 2, 1999 for
the following purposes:

     1. To elect Richard Ayers, David E. A. Carson, Richard W. Greene, Beverly
        L. Hamilton,and F. William Marshall, Jr. as Trustees for indefinite
        terms of office;

     2. To approve amendments to the Investment Management Agreements to require
        the Funds to assume certain expenses currently being paid by
        Massachusetts Mutual Life Insurance Company, as investment manager;

     3. To approve changes in the fundamental investment policies of the Trust
        to permit MML Managed Bond Fund and MML Blend Fund to engage in dollar
        roll transactions;

     4. To approve changes in the fundamental investment policies of the Trust
        to permit MML Managed Bond Fund, MML Blend Fund, MML Equity Fund and MML
        Equity Index Fund to engage in lending portfolio securities with respect
        to not more than 33% of the total assets of each such Fund; and

     5. To transact such other business as may properly come before the meeting,
        or any adjournments thereof.

     Shareholders who do not expect to attend the Special Meeting are asked to
indicate voting instructions on the enclosed proxy instruction form and to date,
sign and return it in the accompanying postage-paid envelope. To avoid
unnecessary duplicate mailings, we ask your cooperation in promptly mailing your
proxy no matter how large or small your holdings may be. The Board of Trustees
of the Trust recommends a vote in favor of each nominee to the Board and in
favor of each Proposal. WE URGE YOU TO MARK, SIGN, DATE AND MAIL THE ENCLOSED
PROXY INSTRUCTION FORM PROMPTLY.

                       By Order of the Board of Trustees,

                       /s/ Stephen L. Kuhn

                       STEPHEN L. KUHN
                       Vice President and Secretary

Springfield, Massachusetts
February 17, 1999

                                       1
<PAGE>
 
                                PROXY STATEMENT
                                        
                              General Information

     The enclosed proxy is solicited by and on behalf of the Board of Trustees
of MML Series Investment Fund (the "Trust") in connection with a Special Meeting
of Shareholders to be held at 1295 State Street, Springfield, Massachusetts, at
9:30 a.m. on April 2, 1999 (the "Special Meeting") for the purposes described
below. The cost of preparing and mailing this Proxy Statement, the Notice of
Special Meeting, the Proxy Instruction Forms and any additional material which
may hereafter be furnished in connection with the solicitation of proxies will
be paid by Massachusetts Mutual Life Insurance Company ("MassMutual") pursuant
to the terms of its Investment Management Agreements with the Trust on behalf of
MML Money Market Fund ("MML Money Market"), MML Managed Bond Fund ("MML Managed
Bond"), MML Blend Fund ("MML Blend"), MML Equity Fund ("MML Equity"), MML Equity
Index Fund ("MML Index"), and MML Small Cap Value Equity Fund ("MML Small Cap")
(the six series of the Trust, hereinafter referred to collectively as the
"Funds").

     This Proxy Statement and the enclosed Proxy Instruction Forms were first
sent to shareholders and variable contract holders entitled to instruct
shareholders how to vote on or about February 17, 1999. A shareholder or
contract holder giving the proxy has the power to revoke it at any time before
it is exercised. A proxy may be revoked only by the Trust's receipt of a signed
and dated written notice of revocation, by filing a duly executed Proxy
Instruction Form bearing a later date, or by attending the Special Meeting and
voting in person.

     The Special Meeting will be held for the following purposes:

- - --------------------------------------------------------------------------------
Proposal                                        Shareholders Solicited
- - --------------------------------------------------------------------------------

(1) To elect Richard H. Ayers, David E.
    A. Carson, Richard W. Greene                     All shareholders
    Beverly L. Hamilton,and F. William Marshall, 
    Jr. as Trustees for indefinite terms of office;
 
(2) To approve an amendment to the
    Investment Management Agreement for each         All shareholders
    Fund, requiring the Funds to

                                       2
<PAGE>
 
    to assume certain expenses currently 
    being paid by MassMutual, as 
    investment manager;
 
(3) To approve changes in the fundamental
    investment policies of the Trust to         Shareholders of MML Managed
    permit MML Managed Bond Fund and MML        Bond Fund and MML Blend Fund
    Blend Fund to engage in dollar roll
    transactions; and

(4) To approve changes in the fundamental
    investment policies of the Trust to         Shareholders of MML Managed
    permit MML Managed Bond Fund, MML Blend     Bond Fund, MML Blend Fund,
    Fund, MML Equity Fund and MML Equity        MML Equity Fund, and MML
    Index Fund to engage in lending portfolio   Equity Index Fund
    securities with respect to not more than
    33% of the total assets of each such Fund.
 
- - -------------------------------------------------------------------------

     To be entitled to notice of and to vote at the Special Meeting, a
shareholder must have owned shares of the Trust as of the close of business on
February 1, 1999 (the "Record Date"). Shareholders entitled to vote shall have
one vote for each share of the Trust owned and a proportionate fractional vote
for each fractional share owned. Proxy Instruction Forms are enclosed for this
purpose. On the Record Date, there were XXXXXXXXX votes eligible to be cast at
this meeting, attributable to each Fund as follows:

     MML Equity Fund:                  XX shares
     MML Money Market Fund:            XX shares
     MML Managed Bond Fund:            XX shares
     MML Blend Fund:                   XX shares
     MML Equity Index Fund:            XX shares
     MML Small Cap Value Equity Fund:  XX shares

MassMutual, MML Bay State Life Insurance Company ("MML Bay State") and C.M.
Life Insurance Company ("C.M. Life") own of record all of the outstanding shares
of the Trust.  However, the owners of variable life insurance policies
(hereinafter referred to as "Variable Life Shareholders") and variable annuity
contracts (hereinafter referred to as 

                                       3
<PAGE>
 
"Variable Annuity Shareholders")/1/ that depend upon the investment performance
of the following separate accounts will have the right to instruct MassMutual,
MML Bay State and C.M. Life as to how shares of the Trust deemed attributable to
their contracts on February 1, 1999 shall be voted:

     MassMutual Variable Annuity Funds 1 and 2;
     MassMutual Variable Annuity Separate Accounts 1, 2 and 3;
     MassMutual Variable Life Separate Accounts I and II;
     MassMutual Separate Account C;
     MML Bay State Variable Life Separate Accounts I, II, III, IV
       and V;
     MML Bay State Variable Annuity Separate Account 1; and
     C.M. Life Variable Life Separate Account I.

Proxy Instruction Forms are enclosed for this purpose. VARIABLE LIFE
SHAREHOLDERS AND VARIABLE ANNUITY SHAREHOLDERS ENTITLED TO INSTRUCT HOW SHARES
OF THE FUNDS ARE VOTED ARE NOT EXPECTED TO ATTEND THE SPECIAL MEETING.

                            Quorum and Vote Required

     With respect to Proposal 1, the Trust's Agreement and Declaration of Trust
(the "Declaration of Trust") provides that a plurality of all shares voted is
required to elect Trustees.  With respect to Proposals 2, 3 and 4, shares will
be voted separately by Fund.  The holders of shares are entitled to one vote
for each share (and a fractional vote for a fractional share) held at the close
of business on the Record Date. Under the Declaration of Trust, 30% of the
shares of the Trust entitled to vote, present in person or represented by proxy,
constitutes a quorum for the transaction of business with respect to Proposal 1.
The five nominees for election as Trustees at the Special Meeting who receive
the greatest number of votes properly cast for the election of trustees shall be
elected.
- - --------------------
/1/ The votes attributable to Variable Annuity Shareholders shall be referred to
as "Variable Annuity Votes" and the votes attributable to the Variable Life
Shareholders shall be referred to as "Variable Life Votes".

                                       4
<PAGE>
 
     Proposals 2, 3 and 4 were approved and recommended for shareholder approval
by the Trust's Board of Trustees ("Board of Trustees") on the condition that a
Proposal will not be presented at the Special Meeting for a vote unless
MassMutual, MML Bay State and C.M. Life have received instructions to vote a
majority of the Variable Annuity Votes and a majority of the Variable Life Votes
in the same way. For example, if the instructions to vote by one group of
shareholders is FOR but the other is AGAINST, the Proposal will not be presented
at the Meeting and the Trust will proceed as if the Proposal had never been
made.

     Each Fund votes separately on the fundamental policies of the Trust and
investment management agreements that relate to that Fund. For that reason, each
of the Funds votes separately on Proposal 2; MML Managed Bond Fund and MML Blend
Fund on Proposal 3 vote separately; and MML Managed Bond Fund, MML Blend Fund,
MML Equity Fund, and MML Equity Index Fund vote separately on Proposal 4.
Pursuant to the Declaration of Trust, 30% of the shares of a Fund entitled to
vote, either present in person or by represented by proxy, shall constitute a
quorum for the transaction of business by that Fund. A majority/2/ of the shares
of each Fund voted shall decide the questions posed by Proposals 2, 3 and 4.

     Votes cast by proxy or in person at the Special Meeting will be counted by
persons appointed by the Trust to act as election inspectors for the Special
Meeting.  The election inspectors will count the total number of votes cast
"for" approval of the Proposals for purposes of determining whether sufficient
affirmative votes have been cast.  The election inspectors will count shares
represented by proxies that "withhold authority" to vote for a nominee for
election as a Trustee (or that reflect abstentions) as shares that are present
and entitled to vote on the matter for purposes of determining the presence of a
quorum.  With respect to Proposal 1, an abstention from voting has no effect on
the outcome of the vote or Proposal.  With respect to Proposals 2, 3 and 4,
withholding a vote or an abstention from voting has the effect of a negative
vote.

     MassMutual, MML Bay State and C.M. Life will vote shares on a Proposal for
which they have not received instructions from Variable Life Shareholders or
Variable Annuity Shareholders in proportion to those votes for which
instructions were received by MassMutual, MML Bay State and C.M. Life from
Variable Life Shareholders or Variable Annuity Shareholders.  If a shareholder
executes and returns a proxy but fails to 

- - ----------------------
/2/ As used in this Proxy Statement "majority vote" means the affirmative vote
of at least 67% of the voting shares of a Fund present at the Special Meeting
(provided that more than 50% of the outstanding voting shares of the Fund are
present or represented by proxy at the Special Meeting) or more than 50% of the
outstanding voting shares of the Fund, whichever is less.

                                       5
<PAGE>
 
indicate how the votes should be cast, the proxy will be voted in favor of each
Proposal.

     A copy of the Trust's Annual Report for the fiscal year ended December 31,
1998 is available without charge upon request and may be obtained by calling 1-
800-767-1000, ext. 8480 or by writing the Trust at the address above.

                                  PROPOSAL (1)

                              ELECTION OF TRUSTEES

     The Board of Trustees is currently comprised of the following seven
Trustees: Gary E. Wendlandt (Chairman), Ronald J. Abdow, Mary E. Boland, Richard
G. Dooley, F. William Marshall, Jr., Charles J. McCarthy, and John H.
Southworth. Richard H. Ayers, David E. A. Carson, Beverly L. Hamilton, and
Richard W. Greene, have been nominated to stand for election at the Special
Meeting. Mr. Marshall was appointed as a Trustee by the Board of Trustees
effective as of February 9, 1996. He has been nominated for election as a
Trustee by the shareholders.

     All nominees have consented to serve as Trustees of the Trust, if elected.
If any of the nominees for Trustees should for any reason become unavailable as
a candidate at the meeting, which is not now anticipated, votes pursuant to the
enclosed proxy will be cast for a substitute candidate in the discretion of
those persons named in the enclosed Proxy Instruction Forms. Pursuant to the
Trust's Declaration of Trust, a nominee elected by shareholders will serve as a
Trustee until he or she dies, resigns or is removed.

     Nominees for election by shareholders, Trustees whose re-election is not
being sought, and the executive officers of the Trust, together with their ages
and a brief description of their principal occupations during the past five
years, directorships in public companies, and their terms on the Board are set
forth below.

                                       6
<PAGE>
 
Name, Age and Position         Principal Occupation During Past Five Years and
with the Trust                 Other Principal Business Affiliations
- - --------------------------------------------------------------------------------

                                       7
<PAGE>
 
Gary E. Wendlandt*
                           Chief Investment Officer (since 1993) and
Age 48, Chairman, Chief    Executive Vice President, MassMutual;
Executive Officer and      Chairman (since 1995), President (1983-1995)
Trustee of the Trust       and Trustee, MassMutual Corporate Investors
(since 1994)               (closed-end investment company); Chairman
                           (since 1995), President (1988-1995) and
                           Trustee, MassMutual Participation Investors
                           (closed-end investment company); Chairman
                           (since 1996), Antares Capital Corporation
                           (finance company); Chairman, HYP Management,
                           Inc. (managing member of MassMutual High
                           Yield Partners LLC) and MMHC Investment, Inc.
                           (investor in MassMutual High Yield Partners
                           LLC); Advisory Board Member (since 1996),
                           MassMutual High Yield Partners LLC (high
                           yield bond fund); President and Director
                           (since 1995), DLB Acquisition Corporation
                           (holding company for investment advisers);
                           Director, Oppenheimer Acquisition Corporation
                           (holding company for investment advisers);
                           Supervisory Director, MassMutual/Carlson CBO
                           N.V. (collateralized bond fund); Director
                           (since 1994), MassMutual Corporate Value
                           Partners Limited (investor in debt and equity
                           securities) and MassMutual Corporate Value
                           Limited (parent of MassMutual Corporate Value
                           Partners Limited); Chairman (since 1994) and
                           Director (since 1993), MML Realty Management
                           Corporation; Chairman (since 1994), Chief
                           Executive Officer (1994-1996), Cornerstone
                           Real Estate Advisers, Inc. (wholly-owned real
                           estate investment adviser subsidiary of
                           MassMutual Holding Trust); Director, Merrill
                           Lynch Derivative Products, Inc.; Chairman and
                           Chief Executive Officer (since 1994),
                           MassMutual Institutional Funds (open-end
                           investment company).
- - ------------------------------- 
* Trustee who is an "interested person" of the Trust within the definition set
forth in Section 2(a)(19) of the Investment Company Act of 1940, as amended.
                                       8
<PAGE>

Ronald J. Abdow            President, Abdow Corporation (operator of
Age 67, Trustee of the     restaurants); General Partner, Grove
Trust (since 1994)         Investment Group (apartment building
                           syndicator); Trustee, Abdow G&R Trust and
                           Abdow G&R Co. (owners and operators of
                           restaurant properties); Partner, Abdow
                           Partnership, Abdow Auburn Associates, and
                           Abdow Hazard Associates (owners and operators
                           of restaurant properties); Trustee (since
                           1994), MassMutual Institutional Funds
                           (open-end investment company).
 
Mary E. Boland             Attorney at Law, Egan, Flanagan and Cohen,
Age 60, Trustee of the     P.C. (law firm), Springfield, MA; Director
Trust (since 1994)         (since 1995), Trustee (until 1995), SIS Bank
                           (formerly, Springfield Institution for
                           Savings); Trustee (since 1994), MassMutual
                           Institutional Funds (open-end investment
                           company).
 
Richard G. Dooley*         Consultant (since 1993), Executive Vice
Age 69, Vice Chairman      President and Chief Investment Officer
and Trustee of the         (1978-1993), MassMutual; Director (since
Trust (since 1996)         1996), Investment Technology Group, Inc.;
                           Director, The Advest Group, Inc. (financial
                           services holding company), HSB Group Inc.
                           (formerly known as Hartford Steam Boiler
                           Inspection and Insurance Co.), New England
                           Education Loan Marketing Corporation;
                           Director, Kimco Realty Corp. (shopping center
                           ownership and management); Director (since
                           1993), Jefferies Group, Inc. (financial
                           services holding company); Vice Chairman
                           (since 1995), Chairman (1982-1995),
                           MassMutual Corporate Investors, and Vice
                           Chairman (since 1995), Chairman (1988-1995),
                           MassMutual Participation Investors
                           (closed-end investment companies); Trustee
                           (since 1996), Mass Mutual

- - ------------------------------
* Trustee who is an "interested person" of the Trust within the definition set
forth in Section 2(a)(19) of the Investment Company Act of 1940, as amended.

                                       9
<PAGE>
 
                            Institutional Funds (open-end investment company).
 
F. William Marshall, Jr.    Chairman, SIS/Family F.S.B. (formerly SIS Bank)
Age 57, Trustee of the      (since 1999), President, Chief Executive Officer
Trust (since 1996) and      and Director (1993-1999), SIS Bancorp, Inc. and
Nominee                     SIS Bank (formerly, Springfield Institution for
                            Savings); Director, (since 1999), Peoples
                            Heritage Financial Group; Chairman and Chief
                            Executive Officer (1990-1993), Bank of Ireland
                            First Holdings, Inc. and First New Hampshire
                            Banks; Trustee (since 1996), MassMutual
                            Institutional Funds (open-end investment
                            company).
 
Richard H. Ayers            Retired; former adviser to Chairman (1997),
Age 56, Advisory Board      Chairman and Chief Executive Officer
Member, Nominee             (1989-1996) and Director (1985-1996), The
                            Stanley Works (manufacturer of tools,
                            hardware and specialty hardware products);
                            Director, Southern New England
                            Telecommunications Corp. and Perkin-Elmer
                            Corp.; Trustee (since 1996), MassMutual
                            Institutional Funds (open-end investment
                            company).
 
David E. A. Carson          Chairman and Chief Executive Officer (since
Age 64, Advisory Board      1997), President and Chief Executive Officer
Member, Nominee             (1985-1997), People's Bank; Director, United
                            Illuminating Co. (electric utility); Trustee,
                            American Skandia Trust (open-end investment
                            company); Trustee (since 1996), MassMutual
                            Institutional Funds (open-end investment
                            company).
 
                                      10
<PAGE>
 
Beverly L. Hamilton        President, ARCO Investment Management Co.;
Age 52, Advisory Board     Director, Connecticut Natural Gas; Director,
Member, Nominee            Emerging Markets Growth Fund (closed-end
                           investment company); Director (since 1997),
                           United Asset Management Corp. (investment
                           management); Trustee (since 1996), MassMutual
                           Institutional Funds (open-end investment
                           company).
 
Charles J. McCarthy        Proprietor, Synectics Financial Company
Age 75, Trustee of the     (venture capital activities, business
Trust (since 1994)         consulting and investments); Trustee (since
                           1994), MassMutual Institutional Funds
                           (open-end investment company).
 
John H. Southworth         Chairman (since 1993), Southworth Company
Age 71, Trustee of the     (manufacturer of paper and calendars);
Trust (since 1994)         Director (since 1995), Trustee (until 1995),
                           SIS Bank (formerly, Springfield Institution
                           for Savings); Trustee (since 1994),
                           MassMutual Institutional Funds (open-end
                           investment company).

Richard W. Greene          Executive Vice President and Treasurer (since
Age 63, Advisory Board     1986), University of Rochester (private
Member, Nominee            university); Trustee (since 1996), MassMutual
                           Institutional Funds (open-end investment
                           company).
 
Stuart H. Reese            Chief Executive Director (since 1997),
Age 44, President of the   Executive Director (1996-1997), Senior Vice
Trust (since 1994)         President (1993-1996), MassMutual; President
                           (since 1995), Executive Vice President
                           (1993-1995), MassMutual Corporate Investors
                           and MassMutual Participation Investors
                           (closed-end investment companies); Director
                           (since 1996), Antares Capital Corporation
                           (finance company) and Charter Oak Capital
                           Management, Inc. (investment adviser);
                           President and Director (since 1996), HYP
                           Management Inc. (managing 

                                      11
<PAGE>
 
                           member of MassMutual High Yield Partners LLC), and
                           MMHC Investment Inc. (investor in funds sponsored by
                           MassMutual); Director (since 1994), MassMutual
                           Corporate Value Partners Limited (investor in debt
                           and equity securities) and MassMutual Corporate Value
                           Limited (parent of MassMutual Corporate Value
                           Partners Limited); Supervisory Director (since 1994),
                           MassMutual/Carlson CBO N.V. Inc. (collateralized bond
                           fund); President (since 1997), MassMutual/Darby CBO
                           IM Inc. (manager of MassMutual/Darby CBO LLC, a high
                           yield bond fund); Director (1994-1996), Pace
                           Industries (aluminum die caster); Advisory Board
                           Member (since 1995), Kirtland Capital Partners;
                           Chairman and President (1990-1993), Aetna Financial
                           Services, Inc.; President (since 1995), MassMutual
                           Institutional Funds (open-end investment company).
                           
Mary Wilson Kibbe          Executive Director (since 1997), Senior Managing
Age 45, Senior Vice        Director (1996-1997), Vice President and Managing
(since 1994)               Director (1991-1996), MassMutual; Senior Vice
                           President (since 1996), HYP Management, Inc.
                           (managing member of MassMutual High Yield Partners
                           LLC) and MMHC Investment, Inc. (investor in funds
                           sponsored by MassMutual); Vice President, MassMutual
                           Participation Investors and MassMutual Corporate
                           Investors (closed-end investment companies); Vice
                           President (1991-1995), Oppenheimer Investment Grade
                           Bond Fund (open-end investment company).
                           
Charles C. McCobb, Jr.     Managing Director (since 1997), MassMutual;
Age 55, Vice President     Managing Director and Vice President
of the Trust               (1994-1997), Citicorp, Inc. (banking);
                           Managing Director (1985-1994), Aetna Life &
                           Casualty (insurance company); Vice President
                           (since 1996), MassMutual Corporate Investors
                           and 
                                      
                                      12
<PAGE>
 
                           MassMutual Participation Investors
                           (closed-end investment companies).
 

Stephen L. Kuhn            Vice President and Deputy General Counsel
Age 52, Vice President     (since 1998); Vice President and Associate
and Secretary of the       General Counsel (1992-1998), MassMutual; Vice
Trust (since 1994)         President and Secretary, MassMutual
                           Participation Investors and MassMutual
                           Corporate Investors (closed-end investment
                           companies); Assistant Secretary (since 1996),
                           Antares Capital Corporation (finance
                           company); Chief Legal Officer and Assistant
                           Secretary (since 1995), DLB Acquisition
                           Corporation (holding company for investment
                           advisers); Assistant Secretary, Oppenheimer
                           Acquisition Corporation (holding company for
                           investment advisers); Vice President and
                           Secretary, MassMutual Institutional Funds
                           (open-end investment company).

Judith A. Martini          Second Vice President (since 1996), MassMutual;
Age 50, Vice President     Marketing Manager (1984-1996), Connecticut Mutual
of the Trust               Life Insurance Company (life insurance company).
                            
Mark B. Ackerman           Investment Director (since 1996), Associate
Age 33, Treasurer of       Director (1993-1996), MassMutual; Controller
the Trust                  (since 1997), Associate Treasurer (1995-1997), 
                           MassMutual Participation Investors and MassMutual 
                           Corporate Investors (closed-end investment 
                           companies); Comptroller (since 1997), Associate 
                           Director (1995-1996), MassMutual Institutional Funds
                           (open-end investment company).
 

Board and Committee Meetings

  The Trust has an Audit Committee, consisting of Trustees who are not
"interested persons" (as defined in the Investment Company Act of 1940) of the
Trust.  The Audit Committee, whose members are Messrs. 

                                      13
<PAGE>
 
McCarthy and Southworth, makes recommendations to the Trustees as to the
engagement or discharge of the Trust's independent auditors, supervises
investigations into matters relating to audit functions, reviews with the
Trust's independent auditors the results of the audit engagement, and considers
the audit fees. In 1998, the Audit Committee met once and all members of the
committee were present.

  Each Trustee attended 100% of the aggregate number of all meetings of the
Board of Trustees, with the exception of Mr. Dooley, who attended 75% of such
meetings.

Compensation

  The Trust, on behalf of each Fund, pays each member of its Board of Trustees
who is not an "interested person" of the Trust or MassMutual a $2,000 fee for
each calendar quarter and a $2,000 fee for each meeting of the Board of Trustees
attended by such Trustee.  Such Trustees who are members of the Audit Committee,
are paid an additional $1,000 per year. In addition, the Trust reimburses out-
of-pocket business travel expenses to such Trustees.  Trustees and officers of
the Trust who are "interested persons" of the Trust or MassMutual are not
entitled to any fee for their services to the Trust.

  The following table discloses the compensation paid to the Trust's non-
interested Trustees for the fiscal year ended December 31, 1998.  The Trust has
no pension, retirement, or deferred compensation plans.  All of the non-
interested Trustees also serve as Trustees of one other investment company
managed by MassMutual.

- - -------------------------------------------------------------------------------
Name of Person and             Aggregate                Total Compensation from
Position                       Compensation From        Trust and Fund Complex
                               From Trust
- - -------------------------------------------------------------------------------
Ronald J. Abdow,                                                
Trustee                            $16,000                      $32,000
- - -------------------------------------------------------------------------------
Mary E. Boland,                                                     
Trustee                            $16,000                      $32,000
- - -------------------------------------------------------------------------------
F. William Marshall,                                                
Trustee                            $16,000                      $32,000
- - -------------------------------------------------------------------------------
Charles J. McCarthy,                                                
Trustee; Member,                   $17,000                      $34,000
Audit Committee
- - -------------------------------------------------------------------------------

                                      14
<PAGE>
 
- - ---------------------------------------------------------------------------
John H. Southworth,                                                 
Trustee; Member,                       $17,000                $34,000
Audit Committee
- - ---------------------------------------------------------------------------

  Mr. Dooley and Mr. Wendlandt are "interested persons" of the Trust and
MassMutual.  If any of the nominees for Trustee should for any reason become
unavailable as a candidate at the meeting, which is not now anticipated, votes
pursuant to the enclosed proxy will be cast for a substitute candidate in the
discretion of MassMutual, MML Bay State or C.M. Life.

                              Related Information


MassMutual

  Listed below are the names and principal occupations of the Directors of
MassMutual and of MassMutual's principal executive officer, all of whose
addresses are the same as that of MassMutual.

- - --------------------------------------------------------------------------------
Name                    Position with MassMutual and Principal 
                        Occupation
- - --------------------------------------------------------------------------------
Roger G. Ackerman       Director of MassMutual; Chairman and Chief
                        Executive Officer, Corning Incorporated
                        (manufacturer of specialty materials,
                        communication equipment, and consumer products)
- - --------------------------------------------------------------------------------
James R. Birle          Director of MassMutual; Founding Chairman of
                        Resolute Partners, Inc.
- - --------------------------------------------------------------------------------
Gene Chao               Director of MassMutual; President and Chief
                        Executive Officer, Computer Projections, Inc.
- - --------------------------------------------------------------------------------
Patricia D. Dennis      Director of MassMutual; Senior Vice President
                        and Assistant General Counsel, SBC
                        Communications, Inc. (telecommunications)
- - --------------------------------------------------------------------------------
Anthony Downs           Director of MassMutual; Senior Fellow, Brookings
                        Institution (non-profit policy research center)
- - --------------------------------------------------------------------------------
James L. Dunlap         Director of MassMutual; Retired (since 1998);
                        Former President and Chief Operating Officer,
                        Ocean Energy, Inc. (oil exploration).
- - --------------------------------------------------------------------------------

                                      15
<PAGE>
 
- - --------------------------------------------------------------------------------
                        Position with MassMutual and Principal 
Name                    Occupation
- - --------------------------------------------------------------------------------
William B. Ellis        Director of MassMutual; Senior Fellow at Yale
                        University
- - --------------------------------------------------------------------------------
Robert M. Furek         Director of MassMutual; Partner (since 1997)
                        Resolute Partners, LLC (private merchant bank)
- - --------------------------------------------------------------------------------
Charles K. Gifford      Director of MassMutual; Chairman and Chief
                        Executive Officer of Bank of Boston Corporation;
                        Chief Executive Officer of The First National
                        Bank of Boston
- - --------------------------------------------------------------------------------
William N. Griggs       Director of MassMutual; Managing Director,
                        Griggs & Santow, Inc. (business consultants)
- - --------------------------------------------------------------------------------
George B. Harvey        Director of MassMutual; Retired, (since 1996);
                        Former Chairman, President and Chief Executive
                        Officer, Pitney Bowes, Inc. (office machines
                        manufacturer)
- - --------------------------------------------------------------------------------
Barbara Barnes          Director of MassMutual; Director, The Vanguard
Hauptfuhrer             Group of Investment Companies, The Great
                        Atlantic and Pacific Tea Company, Inc. (operator
                        of retail food stores), Knight-Ridder, Inc.
                        (publisher of daily newspapers and operator of
                        cable television and business information
                        systems), Raytheon Company (manufacturer of
                        electronic equipment), Alco Standard Corp.
                        (diversified manufacturer and distributor)
- - --------------------------------------------------------------------------------
Sheldon B. Lubar        Director of MassMutual; Chairman, Lubar & Co.,
                        Incorporated (investment management and advisory
                        company)
- - --------------------------------------------------------------------------------
William B. Marx, Jr.    Director of MassMutual; Retired (since 1996);
                        Former Senior Executive Vice President, Lucent
                        Technologies, Inc. (public telecommunications
                        systems and software)
- - --------------------------------------------------------------------------------
John F. Maypole         Director of MassMutual; Managing Partner of
                        Peach State Real Estate Holding Company (real
                        estate investment company)
- - --------------------------------------------------------------------------------

                                      16
<PAGE>
 
- - --------------------------------------------------------------------------------
                             Position with MassMutual and Principal 
Name                         Occupation
- - --------------------------------------------------------------------------------
Robert J. O'Connell          Director and Chief Executive Officer of
                             MassMutual
- - --------------------------------------------------------------------------------
Thomas B. Wheeler            Chairman and Director of MassMutual
- - --------------------------------------------------------------------------------
Alfred M. Zeien              Director of MassMutual; Chairman and Chief
                             Executive Officer, The Gillette Company
                             (manufacturer of personal care products)
- - --------------------------------------------------------------------------------
The Board of Trustees recommends a vote for the election of each nominee.

                                 PROPOSAL (2)

TO APPROVE AN AMENDMENT TO THE INVESTMENT MANAGEMENT AGREEMENT FOR EACH FUND,
REQUIRING THE FUNDS TO ASSUME CERTAIN EXPENSES CURRENTLY BEING PAID BY THE
MASSMUTUAL, AS INVESTMENT MANAGER

Description of Investment Management Agreements

  MassMutual is the investment manager of the Funds and is located at 1295 State
Street, Springfield, Massachusetts, and is a Massachusetts corporation.
MassMutual currently has six Investment Management Agreements with the Trust, on
behalf of each of the six Funds (the "Management Agreements"), and all are
substantially identical (except for fees).  All six Management Agreements were
last approved, in person, by the Board of Trustees, including a majority of
those members of the Board who are not parties to the Management Agreements or
"interested persons" of any such party, at a meeting called for the purpose of
voting on such approval on February 1, 1999.

  On February 1, 1999, a majority of the Trustees of the Funds who are not
parties to such agreement or interested persons (as defined in the Investment
Company Act of 1940 (the "1940 Act")) of any such party (the "Independent
Trustees") and a majority of the entire Board of Trustees met in person and
approved, subject to the required shareholder approval described herein, the
proposed amendment to the Management Agreements.  See Exhibit A, Proposal 2, for
the text of the amendment to the Management Agreements.

                                      17
<PAGE>
 
  If the amendment is approved by a vote of the holders of a majority of the
outstanding shares of the Trust (as defined in the 1940 Act) the Management
Agreements will be amended to require the Funds to bear their own expenses,
provided however, that MassMutual will bear the cost of fund accounting and
other administrative service expenses, investment advisory services, and
distribution expenses. The Management Agreements, as amended, will be effective
as of May 3, 1999, and will continue in effect for a period of two years and
from year-to-year thereafter unless otherwise terminated in accordance with
their respective terms.

  Under the terms of the current Management Agreements, MassMutual acts as
investment adviser and manager to each of the Funds subject to such general or
specific instructions as may be given by the Board of Trustees.  The Management
Agreements provide that MassMutual will perform all administrative functions
relating to the Funds and will bear all expenses of the Funds except: (1) taxes
and corporate fees payable to government agencies; (2) brokerage commissions
(which may be higher than other brokers charge if paid to a broker which
provides brokerage and research services to MassMutual, David L. Babson and
Company, Inc., and Mellon Equity Associates, L.L.P. (collectively, the
"Advisers") or for use in providing investment advice and management to the
Funds and other accounts over which the Advisers exercise investment discretion)
and other capital items payable in connection with the purchase or sale of Fund
investments; (3) interest on account of any borrowings by the Funds; (4) fees
and expenses of Trustees of the Trust who are not interested persons, as defined
in the 1940 Act, of the Advisers or the Trust; and (5) fees of the Funds'
independent certified public accountants.

  For providing the services and bearing the expenses described above,
MassMutual is paid a quarterly fee at the annual rate of .50% of the first $100
million of the average daily net asset value of each Fund, .45% of the next $200
million, .40% of the next $200 million and .35% of any excess over $500 million.
MassMutual has unilaterally agreed to bear expenses of each Fund (with the
exception of MML Equity Index) (other than the management fee, interest, taxes,
brokerage commissions and extraordinary expenses) in excess of .11% of average
daily net asset value through April 30, 2000. In 1998, MML Equity, MML Money
Market, MML Managed Bond, MML Blend, MML Small Cap and MML Equity Index paid
fees to MassMutual amounting to .37%, .46%; .45%, .37%, .39% and .40%,
respectively, of their average daily net assets during the year. The

                                      18
<PAGE>
 
aggregate management fees paid by the Funds to MassMutual in 1998 was
$22,356,185.

  Each Management Agreement automatically terminates: (1) unless its continuance
is specifically approved at least annually by the affirmative vote of a majority
of the Board of Trustees, which affirmative vote shall include a majority of the
members of the Board who are not interested persons (as defined in the 1940 Act)
of MassMutual or of MML Trust; or (2) upon its assignment. Under the terms of
each Management Agreement, each Fund recognizes MassMutual's control of the
initials "MML" and each Fund agrees that its right to use these initials is
non-exclusive and can be terminated by MassMutual at any time. Under each
Management Agreement, MassMutual's liability regarding its investment management
obligations and duties is limited to situations involving its willful
misfeasance, bad faith, gross negligence or reckless disregard of such
obligations and duties.

Description of Proposed Amendment

  The amendment to the Management Agreements provides that the Trust would bear
all of its expenses not expressly specified therein as being borne by
MassMutual, whereas under the current Management Agreements, MassMutual bears
all expenses not expressly specified as being borne by the Trust. By requiring
the Trust to bear expenses previously borne by MassMutual, MassMutual's
remuneration would be effectively increased.  Under the current Management
Agreements, the Trust bears:  (1) taxes and corporate fees payable to government
agencies; (2) brokerage commissions and other capital items payable in
connection with the purchase or sale of Fund investments; (3) interest on
account of any borrowings by the Funds; (4) fees and expenses of Trustees of MML
Trust who are not interested persons, as defined in the 1940 Act, of the
Advisers or the Trust; and (5) fees of the Funds' independent certified public
accountants.  The amended Management Agreements provide that the Trust or the
Funds will bear its owns expenses, with the following exceptions:  MassMutual
agrees to bear investment advisory fees, fund accounting and administrative
expenses, and distribution expenses.

  The principal change in expenses would be that the Trust would bear its own
custodial fees, legal fees and expenses, and expenses of producing shareholder
reports.  The cost to the Trust is estimated at approximately $106,156 for the
first 12 months that the amended Management Agreements are in force.  This cost
would be allocated to the Funds in accordance with 

                                      19
<PAGE>
 
the Trust's normal allocation procedures. If approved by the shareholders, the
amended Management Agreements would result in a relatively small increases in
expense ratios, as set forth in the table below.

  The amended Management Agreements will, unless sooner terminated in accordance
with the agreement, continue in effect for a period of two years from their
effective date and thereafter on an annual basis with respect to each of the
Funds, provided such continuance is approved at least annually, as set forth
above.

  The following table shows for the fiscal year ended December 31, 1998:  (a)
the actual operating expenses for the Funds as a percentage of average net
assets, and (b) the pro forma operating expenses assuming the proposed amendment
had been in effect throughout the fiscal year.  The table and examples below
should not be considered to be a representation of past or future expenses of
the Funds.  Actual expenses may vary from year to year and may be higher or
lower than those shown below:


                                 As of 12/31/98


<TABLE>
<CAPTION>
                                      MML          MML                       MML          MML
                         MML         Money       Managed        MML         Small       Equity
                       Equity       Market        Bond         Blend         Cap         Index
<S>                    <C>          <C>          <C>          <C>          <C>          <C>
Annual Fund                                                                                     
Operating
Expenses
% of average  
daily net assets       0.0023%      0.0326%      0.0253%      0.0029%      0.5458%      0.1980% 

Management                                                                                      
Fees                   0.3672%      0.4563%      0.4525%      0.3672%      0.6715%      0.3996% 

Other                                                                                          
Expenses                                                                  -0.4358%*    -0.1011%** 

Total                  0.3694%      0.4889%      0.4779%      0.3700%      0.7815%      0.4965%
- - -------------------------------------------------------------------------------------------------
</TABLE>

*MassMutual has agreed to bear the Fund's expenses (other than the management
fee, interest, taxes, brokerage commissions and extraordinary expenses) in
excess of .11% of the average daily net asset value through April 30, 2000.

**MassMutual has agreed to bear the Fund's expenses (other than the management
fee, interest, taxes, brokerage commissions and extraordinary expenses) in
excess of .11% of the average daily net asset value through April 30, 1998.

                                      20
<PAGE>
 
                           Pro Forma (as of 12/31/98)

<TABLE>
<CAPTION>
                                      MML          MML                       MML             MML
                         MML         Money       Managed        MML         Small           Equity
                       Equity       Market        Bond         Blend         Cap            Index
<S>                    <C>          <C>          <C>          <C>          <C>              <C>
Annual Fund                                                                                        
Operating
Expenses
% of average           0.0039%      0.0380%      0.0287%      0.0042%      0.6179%         0.1992% 
daily net assets

Management                                                                                             
Fees                   0.3672%      0.4563%      0.4525%      0.3672%      0.6715%         0.3996% 

Other                                                                     -0.5079%        -0.1011%
Expenses

Total                  0.3710%      0.4942%      0.4812%      0.3714%      0.7815%***      0.4965%
                                                                                        (w/reimburse-
                                                                                             ment)
                                                                                           0.5978%
                                                                                            (w/o 
                                                                                         reimburse-
                                                                                            ment)
- - -----------------------------------------------------------------------------------------------------
</TABLE>

***The expense ratio would not change because MassMutual has agreed to bear
certain of the Fund's expenses in excess of .11% of average daily net asset
value through April 30, 2000, as described above.

                                      21
<PAGE>
 
EXAMPLES.  These examples are intended to help you compare the cost of investing
in the Trust with the cost of investing in other mutual funds.  The examples
assume that you invest $10,000 in the shares of the Funds for the time periods
indicated, that your investment earns a 5% return each year and that each Fund's
operating expenses remain the same provided, however, that the table entries
designated as "proposed" reflect the Trust's assumption of certain expenses, as
described herein.  Although your actual costs may be higher or lower, based on
these assumptions your costs would be:

<TABLE>
<CAPTION>
                                    MML         MML                     MML         MML
                        MML        Money      Managed       MML        Small       Equity
                       Equity      Market       Bond       Blend        Cap*       Index
<S>                   <C>         <C>         <C>         <C>         <C>         <C>
1 Year                $ 38.79     $ 51.33     $ 50.18     $ 38.85     $ 82.06     $ 62.75
Present Fee

1 Year                $ 38.96     $ 51.89     $ 50.53     $ 39.00     $ 82.06     $ 62.87
Proposed  Fee

3 Years               $121.82     $161.00     $157.40     $122.02     $252.62     $196.59
Present Fee

3 Years               $122.35     $162.76     $158.51     $122.47     $256.62     $196.97
Proposed  Fee

5 Years               $212.68     $280.74     $274.49     $213.03     $446.07     $342.39
Present Fee

5 Years               $213.60     $283.78     $276.41     $213.82     $446.07     $343.05
Proposed  Fee

10 Years              $479.14     $630.37     $616.53     $479.92     $993.49     $766.48
Present  Fee

10 Years              $481.19     $637.11     $620.77     $481.68     $993.49     $767.92
Proposed Fee
- - -------------------------------------------------------------------------------------------
</TABLE>

*As stated herein, MassMutual has unilaterally agreed to bear expenses of each
Fund (with the exception of MML Equity Index) (other than the management fee,
interest, taxes, brokerage commissions and extraordinary expenses) in excess of
 .11% of average daily net asset value through April 30, 2000.  MML Small Cap is
the only Fund whose expenses exceeded .11%.

  Since the Funds do not impose any shareholder fees, the figures shown would be
the same whether you sold your shares at the end of a period or kept them.

                                      22
<PAGE>
 
  The following table shows on a comparative basis for the fiscal year ended
December 31, 1998 the Trust's aggregate expenses pursuant to the current
Management Agreements and on a pro forma basis under the proposed amended
Management Agreements.  Actual expenses under both the current Management
Agreements and the amended Management Agreements are calculated daily based on
the net assets of each Fund's portfolio.

<TABLE>
<CAPTION>
                                     MML          MML                       MML          MML
                        MML         Money       Managed        MML         Small       Equity
                      Equity       Market        Bond         Blend         Cap         Index
<S>                   <C>          <C>          <C>          <C>           <C>         <C>
Actual Fees           $ 38.79      $ 51.33      $ 50.18      $ 38.85       $82.06      $ 62.75

Pro Forma Fees        $ 38.96      $ 51.89      $ 50.53      $ 39.00       $82.06      $ 62.87

Difference            $  0.17      $  0.56      $  0.35      $  0.15           --      $  0.12

% of actual            0.4362%      1.0947%      0.7037%      0.3739%        0.00%      0.1940%
- - ------------------------------------------------------------------------------------------------
</TABLE>

Management Fee Schedules of other MassMutual Funds with Similar Investment
Objectives

  The Trust is required under applicable regulations of the Securities and
Exchange Commission to provide the management fee schedules of other mutual
funds managed by MassMutual that have investment objectives similar to those of
the Funds.  Accordingly, this information is provided in the following table,
notwithstanding MassMutual's belief that the management fee schedules of these
mutual funds may not be comparable to those of the Funds.

MassMutual Institutional Funds                                   Fee Schedule
<TABLE>
<S>                                                              <C>
MassMutual Core Equity Fund (similar to MML Equity Fund)         0.45%
- - -------------------------------------------------------------------------
MassMutual Core Bond (similar to MML Managed Bond Fund)          0.45%
- - -------------------------------------------------------------------------
MassMutual Balanced (similar to MML Blend)                       0.45%
- - -------------------------------------------------------------------------
MassMutual Small Cap Value   (similar to MML Small Cap)          0.45%
- - -------------------------------------------------------------------------
MassMutual Prime Fund (similar to MML Money Fund)3               0.45%
- - -------------------------------------------------------------------------
</TABLE>

3  MassMutual Prime Fund is not a Money Market Fund as defined in Rule 2a-7 of
the Investment Company Act of 1940 but has a similar investment objective.

                                      23
<PAGE>
 
Factors considered by the Trustees

  The Trustees, including the Independent Trustees, considered various matters
in determining the reasonableness and fairness of the proposed amendments to the
Management Agreements requiring the Funds to assume certain expenses previously
borne by MassMutual as investment manager to the Funds.  The Trustees requested
and evaluated information provided by MassMutual which, in its opinion,
constituted all the information reasonably necessary for the Trustees to form a
judgment as to whether the amended Management Agreements would be in the best
interests of MML Equity, MML Managed Bond, MML Money Market, MML Blend, MML
Small Cap and MML Equity Index (the "Funds").

  In reaching their decision to approve the amended Management Agreement, the
Trustees evaluated the information and documentation provided by MassMutual and
considered such factors as they deemed appropriate. These factors included,
among others:  (1) the advisory fees and other expenses that would be paid by
the Funds under the amended Management Agreements as compared to those of
similar portfolios managed by other investment advisers; (2) the nature, quality
and extent of the portfolio management and non-advisory services furnished by
MassMutual to the Funds; (3) MassMutual's need to maintain and enhance its
ability to retain and attract capable personnel to serve the Funds; (4) the fact
that, with respect to portfolio management services, the amended Management
Agreements would, except as described herein, have terms and conditions
substantially similar to those of the current Management Agreements; (5) the
relationship of the proposed advisory fee structure to the fee structures of
comparable mutual funds and the impact of the proposed changes in advisory fees
on each Fund's expense ratio; and (6) the performance of the Funds.

The Board of Trustees recommends that shareholders vote in favor of the proposed
amendment to the Management Agreements with respect to each of the Funds.

                              Investment Proposals

  Proposals 3 and 4 would provide certain of the Funds with additional authority
to engage in certain additional investment transactions and techniques
(Investment Proposals").  These Proposals, if approved by shareholders, would
change the Trust's fundamental investment policies with respect to certain of
the Funds.  An investment policy that has been 

                                      24
<PAGE>
 
designated as "fundamental" is one that cannot be changed without the
requisite shareholder approval described above in "Quorum and Vote Required."
Non-fundamental investment policies may be changed by the Board of Trustees
without the expense and delay of seeking shareholder approval. If approved by
shareholders, these Proposals would provide the affected Funds with added
flexibility to operate in an increasingly competitive and dynamic environment.
If approved, the Investment Proposals will take effect as soon as possible after
any remaining legal prerequisites to implementation of the Proposals have been
satisfied. If a proposed change in an investment restriction is not approved for
a Fund, that Fund's current investment restriction will remain unchanged.

                                  PROPOSAL (3)

TO APPROVE CHANGES IN THE FUNDAMENTAL INVESTMENT POLICIES OF THE TRUST
APPLICABLE TO MML MANAGED BOND FUND AND MML BLEND FUND TO ENGAGE IN DOLLAR ROLL
TRANSACTIONS

  Currently MML Managed Bond Fund and MML Blend Fund may not engage in "dollar
roll" transactions.  The Board of Trustees has concluded it is appropriate to
update its fundamental investment restrictions to reflect changing market
conditions.  If Proposal 3 is presented to and approved by Shareholders at the
Special Meeting, the Trust's Prospectus and Statement of Additional Information
will be revised as set forth in Exhibit A, Proposal 3.

  To take advantage of attractive financing opportunities in the mortgage market
and to enhance current income, the Trustees have concluded that MML Managed Bond
and MML Blend Fund should be allowed to engage in dollar roll transactions.  A
dollar roll transaction involves a sale by a Fund of a GNMA certificate or other
mortgage-backed securities to a financial institution, such as a bank or a
broker-dealer, concurrent with an agreement by the Fund to repurchase a similar
security from the institution at a later date at an agreed-upon price.  The
securities that are repurchased will bear the same interest rate as those sold,
but generally will be collateralized by different pools of mortgages with
different prepayment histories than those sold.  During the period between the
sale and repurchase, the Fund will not be entitled to receive the interest and
principal payments on the securities sold.  Proceeds of the sale will be
invested in additional instruments for the Fund. A Fund is compensated for
agreeing to repurchase the security by the difference between the 

                                      25
<PAGE>
 
current sales price and the price for the future purchase (often referred to as
the "drop") as well as by the interest earned on the cash proceeds of the
initial sale. Dollar rolls may be renewed over a period of several months with a
different repurchase and repurchase price and a cash settlement made at each
renewal without physical delivery of securities. Moreover, a Fund may enter into
a dollar roll transaction involving a security not then in the Fund's portfolio
so long as the transaction is preceded by a firm commitment agreement pursuant
to which the Fund has agreed to buy the securities on a future date.

  The Funds will not use such transactions for leveraging purposes and,
accordingly, will segregate cash or other liquid securities in an amount
sufficient to meet its obligations under the roll transactions.  Dollar roll
transactions involve potential risks of loss which are different from those
related to the securities underlying the transaction.  For example, if the
counterparty were to become insolvent, the Fund's right to purchase from the
counterparty may be restricted.  Additionally, the market value of the
securities sold by the Fund may decline below the repurchase price of those
securities to be purchased.

  Dollar roll transactions are borrowings, and therefore would be subject to the
investment restriction set forth in the prospectus relating to MML Equity, MML
Money Market, MML Managed Bond and MML Blend, which states that each of these
Funds will not borrow money, except from banks as a temporary measure for
extraordinary or emergency purposes (but not for the purpose of making
investments), and except to the extent that each Fund engages in financial
futures transactions (as described in the Prospectus) and in reverse repurchase
agreements (as described in the Statement of Additional Information), provided
(a) that the aggregate amount of all such borrowings at the time of borrowing
does not exceed 10% of the total assets of the Fund taken at cost, and (b) that
immediately after the borrowing, and at all times thereafter, there will be an
asset coverage of at least 300% for all of the Fund's borrowings (including all
obligations under financial futures contracts on debt obligations).  If Proposal
3 is approved, dollar roll transactions will be permitted forms of borrowing for
the Funds but subject to the limits set forth in (a) and (b) above.

The Board of Trustees of the Trust recommends the shareholders approve Proposal
3 to permit MML Managed Bond Fund and MML Blend Fund to engage in dollar roll
transactions.

                                      26
<PAGE>
 
                                  PROPOSAL (4)

TO APPROVE CHANGES IN THE FUNDAMENTAL INVESTMENT POLICIES OF THE TRUST
APPLICABLE TO MML MANAGED BOND FUND, MML BLEND FUND, MML EQUITY FUND AND MML
EQUITY INDEX FUND TO ALLOW SUCH FUNDS TO ENGAGE IN THE LENDING OF PORTFOLIO
SECURITIES WITH RESPECT TO NOT MORE THAN 33% OF EACH SUCH FUND'S TOTAL ASSETS.

  The Board of Trustees has approved, and recommends that shareholders approve,
amendments to the fundamental investment restrictions of the Trust applicable to
MML Managed Bond Fund, MML Blend Fund, MML Equity Fund and MML Equity Index Fund
to increase the ability of these Funds to engage in lending portfolio
securities. The text of the amended investment restriction is set forth in
Exhibit A, Proposal 4. If Proposal 4 is presented to and approved by
shareholders at the Special Meeting, the Trust's Prospectuses and Statements of
Additional Information will be revised as set forth in Exhibit A, Proposal 4.

  As described in the Trust's Prospectuses and Statements of Additional
Information relating to these Funds, MML Equity Fund, MML Money Market Fund, MML
Managed Bond Fund, MML Blend Fund and MML Equity Index may seek additional
income by making loans of portfolio securities of not more than 10% of their
respective total assets taken at current value.  The proposed new fundamental
investment policy would allow MML Managed Bond, MML Blend, MML Equity and MML
Equity Index to make loans of their portfolio securities of up to 33% of their
respective total assets taken at current value.  This revised investment policy
would remain a fundamental investment policy that could only be changed by the
vote of a "majority" (as defined in the 1940 Act) of the outstanding voting
securities of a Fund.

  Securities lending transactions involve the loan of securities by a lender
(such as one of the Funds) from its portfolio to brokers, dealers and other
financial institutions desiring to borrow securities to complete certain
transactions. The lender retains most of the rights of ownership including
interest, dividends or other distributions payable on the loan securities which
afford the lender an opportunity to earn interest on the amount of the loan and
income on the loan securities' collateral. The lender does not retain voting
rights on the loaned securities. Although lending portfolio

                                      27
<PAGE>
 
securities may involve the risk of delay in recovery of the securities loans or
possible loss of right in the collateral should the borrower fail financially,
loans will be made only to borrowers deemed by MassMutual to be in good
standing.

  Under applicable regulatory requirements and securities lending agreements
(which are subject to change), the loan collateral received by a Fund when it
lends portfolio securities must, on each business day, be at least equal to the
value of the loan securities.  Cash collateral received by a Fund will be
reinvested by the Fund's securities lending agent in high quality, short-term
instruments, including bank obligations, U.S. government securities, repurchase
agreements, money market funds and U.S. dollar denominated corporate instruments
with an effective maturity of one-year or less, including variable rate and
floating rate securities, insurance company funding agreements and asset-backed
securities.  All investments of cash collateral by a Fund are for the account
and risk of such Fund.

The Board of Trustees of the Trust recommends the shareholders approve Proposal
4 to permit MML Managed Bond Fund, MML Blend Fund, MML Equity Fund and MML
Equity Index Fund to engage in the lending of portfolio securities with respect
to not more than 33% of the total assets of each of such Fund.

                  OTHER MATTERS AND DISCRETION OF SHAREHOLDERS

  While the meeting has been called to act upon any other business that may
properly come before it, at the date of this Proxy Statement the only business
which management intends to present or knows that others will present is the
business set forth in the Notice of Meeting.  If other matters lawfully come
before the meeting, and on all procedural matters at said meeting, it is the
intention that the proxies that do not include specific restrictions to the
contrary will be voted on, shall be voted in accordance with the best judgment
of MassMutual, MML Bay State or C.M. Life.

  The Trust does not hold shareholder meetings annually.  Shareholders wishing
to submit proposals for consideration for inclusion in a proxy statement for the
next shareholder meeting should send their written proposals to MML Series
Investment Fund, 1295 State Street, Springfield, Massachusetts 01111-0001, c/o
the Corporate Secretary.

                                      28
<PAGE>
 
  You are requested to mark, date, sign and return the enclosed proxy promptly.
No postage is required on the enclosed envelope.

                                              By Order of the Board of Directors

                                              /s/ Stephen L. Kuhn

                                              Stephen L. Kuhn
                                              Vice President and Secretary

Springfield, Massachusetts
February 17, 1999

                                      29
<PAGE>
 
                            VOTING INSTRUCTION CARD
                           MASSACHUSETTS MUTUAL LIFE

                               INSURANCE COMPANY
                      MML BAY STATE LIFE INSURANCE COMPANY
                          C.M. LIFE INSURANCE COMPANY

VOTING INSTRUCTIONS FOR THE SPECIAL MEETING OF SHAREHOLDERS TO BE HELD ON APRIL
2, 1999 OF THE MML SERIES INVESTMENT FUND

                         MML _______ FUND (The "Fund")

This Instruction Card is solicited by the following insurance companies:
Massachusetts Mutual Life Insurance Company, MML Bay State Life Insurance
Company and C.M. Life Insurance Company (collectively, the "Insurance
Companies"), each of which has issued certain variable annuity and/or variable
life insurance contracts, from owners of such variable annuity and/or variable
life insurance policies who have specified that a portion of their investment be
allocated to this Fund of the MML Series Investment Fund (the "Trust").

The undersigned contract/policy owner hereby instructs that the votes
attributable to the undersigned's interest with respect to the above-referenced
Fund be cast as directed on the reverse side at the Special Meeting of the
Shareholders of the Trust on April 2, 1999 at 9:30 a.m. Springfield time.  The
undersigned, by completing this form, does hereby authorize the Insurance
Companies to exercise their discretion in voting upon such other business as may
properly come before the meeting.

THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF TRUSTEES.

Please mark your proxy, date and sign it, and return it promptly in the
accompanying envelope, which requires no postage if mailed in the United States.
NOTE:  PLEASE SIGN EXACTLY AS YOU NAME(S) APPEAR HEREON.  When signing as
custodian, attorney, executor, administrator, trustee, etc., please give your
full title as such. All joint owners should sign this proxy. If the account is
registered in the name of a 
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corporation, partnership or other entity, a duly authorized individual must sign
on its behalf and give title.


Signature of Policyowner: ____________________ Date: ________ 1999

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PLEASE REFER TO THE PROXY STATEMENT FOR A DISCUSSION OF EACH OF THE PROPOSALS
SET FORTH BELOW.

For each Proposal, indicate your vote by marking one of the boxes under the name
of the Funds in which you own shares.  THE BOARD OF TRUSTEES RECOMMENDS A VOTE
FOR EACH OF THE FOLLOWING:

(1)  FOR EACH FUND:  To elect Richard Ayers, David E.A. Carson, Beverly L.
     Hamilton, Richard W. Greene and F. William Marshall, Jr. as Trustees for
     indefinite terms of office (Proposal Number 1);
 
FOR ALL ____________________________    WITHHOLD ____________________________

To withhold authority for an individual nominee, write that nominee's name on
the line below:
_____________________________________________________________________________

(2)  FOR EACH FUND:  To approve amendments to the Investment Management
     Agreements to require the Funds to assume certain expenses currently paid
     by Massachusetts Mutual Life Insurance Company, as investment manager
     (Proposal Number 2);
 
FOR_________________    AGAINST__________________  ABSTAIN_________________

(3)  FOR MML MANAGED BOND FUND AND MML BLEND FUND ONLY:  To approve changes in
     the fundamental investment policies of the Trust to permit MML Managed Bond
     Fund and MML Blend Fund to engage in dollar roll transactions (Proposal
     Number 3);

FOR_________________    AGAINST__________________  ABSTAIN_________________

(4)  FOR MML MANAGED BOND, MML BLEND FUND, MML EQUITY FUND AND MML EQUITY INDEX
     FUND ONLY:  To approve changes in the fundamental investment policies of
     the Trust to permit MML Managed Bond Fund, MML Blend Fund, MML Equity Fund
     and MML Equity Index Fund to engage in the lending of portfolio securities
     with respect to not more than 33% of the total assets of each such Fund
     (Proposal Number 4);


FOR_________________    AGAINST__________________  ABSTAIN_________________


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                                   EXHIBIT A

Proposal 2.  The proposed amendment to the current Investment Management
Agreements would be accomplished by deleting the first paragraph of Section 3 of
the agreements and inserting the following in substitution therefore:

  3. Administrative Services to be Provided and Expenses to be Assumed by the
  Adviser. Until the termination of the employment of the Adviser as investment
  manager for the Fund, the Adviser will provide, or provide for, all services
  required for the administration of the Trust and the Fund. The Trust (or the
  Fund) shall bear its own expenses, with the following exceptions: the Adviser
  shall bear the cost of investment advisory services, fund accounting and
  administrative expenses, and distribution expenses.

Section 10 of the Management Agreements would also be amended by deleting the
first sentence thereof and inserting the following in substitution therefore:

     This Agreement is effective as of May 3, 1999 and will continue in effect
     for two years from the date hereof, and from year-to-year thereafter as
     long as it is specifically approved at least annually by vote of the Board
     of Trustees of the Trust including the vote of a majority of such Trustees
     who are not interested persons (as defined in the Investment Company Act of
     1940, as amended) of the Adviser or of the Fund; provided, however, that
     (1) this Agreement may at any time be terminated by the Trust on 60 days'
     written notice to the Adviser without the payment of any penalty either by
     vote of the Board of Trustees of the Trust or by the vote of a majority of
     the outstanding shares of the Fund (as defined in the Investment Company
     Act of 1940, as amended); (2) this Agreement shall immediately terminate in
     the event of its assignment (within the meaning of the Investment Company
     Act of 1940, as amended); and (3) this Agreement may be terminated by the
     Adviser on 60 days' written notice to the Trust without the payment of any
     penalty.  Any notice under this Agreement shall be given in writing,
     addressed and delivered, or mailed postpaid, to the other party at the
     principal office of such party.

Proposal 3.  If adopted by shareholders, the Trust's investment practices as set
forth in the Prospectus relating to MML Equity, MML Money 

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Market Fund, MML Managed Bond and MML Blend, would be amended by inserting a new
paragraph in Section V entitled "Investment Practices of the Funds and Related
Risks" after paragraph "E. Cash Positions", as follows:

     F.  Dollar Roll Transactions

     To take advantage of attractive financing opportunities in the mortgage
     market and to enhance current income, MML Managed Bond and MML Blend Fund
     may engage in dollar roll transactions.  A dollar roll transaction involves
     a sale by a Fund of a GNMA certificate or other mortgage-backed securities
     to a financial institution, such as a bank or a broker-dealer, currently
     with an agreement by a Fund to repurchase a similar security from the
     institution at a later date at an agreed-upon price.  The securities that
     are repurchased will bear the same interest rate as those sold, but
     generally will be collateralized by different pools of mortgages with
     different prepayment histories than those sold. Dollar roll transactions
     involve potential risks of loss which are different from those related to
     the securities underlying the transaction.  For a more detailed description
     of dollar roll transactions, see the SAI.

The Statement of Additional Information (the "SAI") relating to MML Money
Market, MML Equity, MML Managed Bond and MML Blend Funds would also be amended
by inserting a new paragraph after paragraph "13. Trading Activity" in the
section entitled "D. Other Investment Practices", as follows:

     14.  Dollar Roll Transactions - To take advantage of attractive financing
     opportunities in the mortgage market and to enhance current income, MML
     Managed Bond and MML Blend may engage in dollar roll transactions.  A
     dollar roll transaction involves a sale by a Fund of a GNMA certificate or
     other mortgage-backed securities to a financial institution, such as a bank
     or a broker-dealer, concurrent with an agreement by a Fund to repurchase a
     similar security from the institution at a later date at an agreed-upon
     price.  The securities that are repurchased will bear the same interest
     rate as those sold, but generally will be collateralized by different pools
     of mortgages with different prepayment histories than those sold.  Dollar
     roll transactions involve potential risks of loss which are different from
     those 

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     related to the securities underlying the transaction. The securities
     that are repurchased will bear the same interest rate as those sold, but
     generally will be collateralized by different pools of mortgages with
     different prepayment histories than those sold.  During the period between
     the sale and repurchase, the Fund will not be entitled to receive the
     interest and principal payments on the securities sold.  Proceeds of the
     sale will be invested in additional instruments for the Fund. A Fund is
     compensated for agreeing to repurchase the security by the difference
     between the current sales price and the price for the future purchase
     (often referred to as the "drop") as well as by the interest earned on
     the cash proceeds of the initial sale.  Dollar rolls may be renewed over a
     period of several months with a different repurchaser and repurchase price
     and a cash settlement made at each renewal without physical delivery of
     securities.  Moreover, a Fund may enter into a dollar roll transaction
     involving a security not then in the Fund's portfolio so long as the
     transaction is preceded by a firm commitment agreement pursuant to which
     the Fund has agreed to buy the securities on a future date.

     The Funds will not use such transactions for leveraging purposes and,
     accordingly, will segregate cash or other liquid securities in an amount
     sufficient to meet its obligations under the roll transactions.  Dollar
     roll transactions involve potential risks of loss which are different from
     those related to the securities underlying the transaction.  For example,
     if the counterparty were to become insolvent, the Fund's right to purchase
     from the counterparty may be restricted.  Additionally, the market value of
     the securities sold by the Fund may decline below the repurchase price of
     those securities to be purchased.

Proposal 4.  If adopted by shareholders, the Trust's investment practices as set
forth in the Prospectus relating to MML Equity Fund, MML Money Market Fund, MML
Managed Bond and MML Blend Fund, would be amended by deleting paragraph "D.
Securities Lending" in Section V entitled "Investment Practices of the Funds
and Related Risks" and replacing it with the following paragraph:

     D. SECURITIES LENDING

     MML Managed Bond Fund, MML Blend and MML Equity may seek additional income
     by making loans of portfolio securities of 

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     not more than 33% of their respective total assets taken at current value.
     Although lending portfolio securities may involve the risk of delay in
     recovery of the securities loaned or possible loss of rights in the
     collateral should the borrower fail financially, loans will be made only to
     borrowers deemed by MassMutual and Babson to be of good standing.

Investment Restriction number 13, set forth in the Statement of Additional
Information (SAI) relating to MML Money Market, MML Equity, MML Managed Bond and
MML Blend  will also be amended by replacing clause (iii) thereof.  This
prohibits MML Money Market, MML Equity, MML Managed Bond and MML Blend from
making loans, with certain exceptions.  Clause (ii) states that MML Managed Bond
and MML Blend may make loans through the lending of portfolio securities with
respect to not more than 10% of the total assets of each such Fund taken at
current value.  This clause would be replaced with the following:

     (iii) in the case of MML Managed Bond and MML Blend, through the lending of
     portfolio securities with respect to not more than 33% of the total assets
     of each such Fund taken at current value.

The Trust's investment techniques as set forth in the Appendix to the Prospectus
relating the MML Equity Index Fund would be amended by replacing the third
sentence in the paragraph entitled "Lending Portfolio Securities" with the
following sentence:

     Loans of portfolio securities may not exceed 33% of the value of the Fund's
     total assets, and the Fund will receive collateral consisting of cash, U.S.
     Government securities or irrevocable letters of credit which will be
     maintained at all times in an amount equal to at least 100% of the current
     market value of the loaned securities.

MML Equity Index Fund's fundamental investment restrictions, set forth in part
III of the Statement of Additional Information relating to that Fund would also
be amended.  Currently, investment restriction number 10 states the MML Equity
Index Fund may lend portfolio securities with respect to not more than 10% of
the total assets of the Fund taken at current value.  This sentence would be
amended as follows:

     However, the Fund may lend portfolio securities with respect to not more
     than 33% of the total assets of the Fund taken at current value; or

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