PUTNAM HIGH YIELD MUNICIPAL TRUST
DEF 14A, 2000-08-25
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                            SCHEDULE 14A INFORMATION

                    PROXY STATEMENT PURSUANT TO SECTION 14(a)
                     OF THE SECURITIES EXCHANGE ACT OF 1934
                                (Amendment No. )

                                                                            ----
                          Filed by the Registrant                            /X/
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                                                                            ----
                 Filed by a party other than the Registrant                 /  /
                                                                            ----
Check the appropriate box:

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/  /     Preliminary Proxy Statement
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/  /     Confidential, for Use of the Commission Only (as permitted by
----     Rule 14a-6(e) (2))

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/ X /    Definitive Proxy Statement
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/  /     Definitive Additional Materials
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----
/  /     Soliciting Material Pursuant to Sec. 240.14a-11(c) or
----     Sec. 240.14a-12

                        PUTNAM HIGH YIELD MUNICIPAL TRUST
                (Name of Registrant as Specified In Its Charter)

                   (Name of Person(s) Filing Proxy Statement,
                            if other than Registrant)
Payment of Filing Fee (Check the appropriate box):

                                      -1-
<PAGE>

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/ X /    No fee required
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/  /     Fee computed on table below per Exchange Act Rule 14a 6(i)(1) and 0-11
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         (1)  Title of each class of securities to which transaction applies:

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

         (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):

         (4)  Proposed maximum aggregate value of transaction:

         (5)  Total fee paid:

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/  /     Fee paid previously with preliminary materials.
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/  /     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:

         (2)  Form, Schedule or Registration Statement No.:

         (3)  Filing Party:

         (4)  Date Filed:

                                      -2-
<PAGE>

IMPORTANT INFORMATION
FOR SHAREHOLDERS IN
PUTNAM HIGH YIELD MUNICIPAL TRUST

         The document you hold in your hands contains your proxy statement and
         proxy card. A proxy card is, in essence, a ballot. When you vote your
         proxy, it tells us how to vote on your behalf on important issues
         relating to your fund. If you complete and sign the proxy, we'll vote
         it exactly as you tell us. If you simply sign the proxy, we'll vote it
         in accordance with the Trustees' recommendations on page 4.

         We urge you to spend a couple of minutes with the proxy statement, and
         either fill out your proxy card and return it to us via mail, or record
         your voting instructions via the Internet. When shareholders don't
         return their proxies in sufficient numbers, we have to incur the
         expense of follow-up solicitations, which can cost your fund money.

         We want to know how you would like to vote and welcome your comments.
         Please take a few moments with these materials and return your proxy to
         us.




                                 [PUTNAM LOGO]
<PAGE>

Table of contents

A Message from the Chairman................................................ 1

Notice of Shareholder Meeting.............................................. 3

Trustees' Recommendations.................................................. 4

Proxy card enclosed




If you have any questions, please contact
us at the special toll-free number we have
set up for you (1-800-225-1581)
or call your financial advisor.
-----------------------------------------------
<PAGE>

A Message from the Chairman

Dear Shareholder:

                                                         [Photo of John A. Hill]

I am writing to you to ask for your vote on important questions that affect
your investment in your fund. While you are, of course, welcome to join us at
your fund's meeting, most shareholders cast their vote by either filling out
and signing the enclosed proxy card or by voting via the Internet. Instructions
are listed at the top of your proxy card. We are asking for your vote on the
following matters: (1) fixing the number of Trustees and electing your fund's
Trustees; (2) ratifying the selection of your fund's independent auditors; and
(3) converting your fund from a closed-end fund to an open-end fund.

Your Trustees unanimously recommend that shareholders vote "For" the first two
proposals. On the third proposal, whether to convert Putnam High Yield
Municipal Trust to an open-end fund, your Trustees unanimously recommend that
shareholders vote "Against" the conversion. This third proposal is on the
agenda as a result of provisions in your fund's governing legal documents that
require that shareholders be given the opportunity to consider a conversion in
the event the fund's shares trade at a discount from net asset value greater
than 10% over a specified period of time.

The Trustees believe that remaining a closed-end fund provides significant
investment benefits that are not available to open-end funds. In general, if
the fund remains a closed-end fund, the portfolio manager can continue to
manage the fund with a steadier, longer term perspective without the short-term
pressures from sales and redemptions of fund shares typically experienced by
open-end funds. Under some circumstances this flexibility can allow a
closed-end fund to out-perform an open-end fund with a similar investment
strategy. If your fund converts to open-end status it will be required to
redeem its outstanding preferred shares. Having preferred shares allows your
fund to benefit from leverage, which means that the income to you as a common
shareholder is increased if earnings on the fund's portfolio and interest on
the fund's assets are greater than the dividend rate on the preferred shares.
In addition, conversion is likely to result in a lower yield


                                       1
<PAGE>


because of increased fund expenses. This result would be inconsistent with the
fund's investment objective of seeking high current income exempt from federal
income tax.

In addition, although the fund traded at a significant discount for most of
this year, it is now trading at a premium. On August 11, 2000 shares of your
fund traded at a 4.04% premium to net asset value. A conversion to open-end
status, where shares would be redeemed at net asset value, would result in the
loss of any premium. If the fund traded at a discount prior to a conversion,
shareholders would have a short-term gain.

The Trustees do not believe that the discounts seen earlier this year justify
the fundamental changes that would result from conversion and the potential
loss of premium, and are therefore recommending that you vote against the
conversion.

Although we would like very much to have you attend your fund's meeting, we
realize this may not be possible. Whether or not you plan to be present, we
need your vote. We urge you to record your voting instructions on the Internet
or complete, sign, and return the enclosed proxy card promptly. A postage-paid
envelope is enclosed.

I'm sure that you, like most people, lead a busy life and are tempted to put
this proxy aside for another day. Please don't. When shareholders do not return
their proxies, your fund may have to incur the expense of follow-up
solicitations. All shareholders benefit from the speedy return of proxies.

Your vote is important to us. We appreciate the time and consideration that I
am sure you will give this important matter. If you have questions about the
proposals, contact your financial advisor or call a Putnam customer service
representative at 1-800-225-1581.
                                         Sincerely yours,


                                         /s/ John A. Hill, Chairman
                                         -----------------------------
                                         John A. Hill, Chairman


                                       2
<PAGE>

PUTNAM HIGH YIELD MUNICIPAL TRUST
Notice of Annual Meeting of Shareholders

>    This is the formal agenda for your fund's shareholder meeting. It tells you
     what matters will be voted on and the time and place of the meeting, if you
     can attend in person.

     To the Shareholders of Putnam High Yield Municipal Trust:

     The Annual Meeting of Shareholders of your fund will be held on October 5,
     2000 at 2:00 p.m., Boston time, on the eighth floor of One Post Office
     Square, Boston, Massachusetts, to consider the following:

1.   Fixing the number of Trustees and electing Trustees. See page 6.

2.   Ratifying the selection by the Trustees of the independent auditors of your
     fund for its current fiscal year. See page 21.

3.   Approving or disapproving the conversion of your fund from closed-end to
     open-end status and the authorization of related amendments to your fund's
     Agreement and Declaration of Trust. See page 22.

     By the Trustees
     John A. Hill, Chairman
     George Putnam, III, President

<TABLE>
     <S>                   <C>
     Jameson A. Baxter     John H. Mullin, III
     Hans H. Estin         Robert E. Patterson
     Ronald J. Jackson     A.J.C. Smith
     Paul L. Joskow        W. Thomas Stephens
     Elizabeth T. Kennan   W. Nicholas Thorndike
     Lawrence J. Lasser
</TABLE>

     WE URGE YOU TO MARK, SIGN, DATE, AND MAIL
     THE ENCLOSED PROXY IN THE POSTAGE-PAID
     ENVELOPE PROVIDED OR RECORD YOUR VOTING
     INSTRUCTIONS VIA THE INTERNET SO YOU WILL
     BE REPRESENTED AT THE MEETING.

     August 26, 2000


                                       3
<PAGE>

Proxy Statement

>    This document will give you the information you need to vote on the matters
     listed on the previous page. Much of the information in the proxy statement
     is required under rules of the Securities and Exchange Commission ("SEC");
     some of it is technical. If there is anything you don't understand, please
     contact us at our special toll-free number, 1-800-225-1581, or call your
     financial advisor.

>    Who is asking for your vote?

     The enclosed proxy is solicited by the Trustees of Putnam High Yield
     Municipal Trust for use at the Annual Meeting of Shareholders of the fund
     to be held on October 5, 2000 and, if the fund's meeting is adjourned, at
     any later meetings, for the purposes stated in the Notice of Annual Meeting
     (see previous page). The Notice of Meeting, the proxy, and the Proxy
     Statement are being mailed on or about August 28, 2000.

>    How do your fund's Trustees recommend that shareholders vote on these
     proposals?

     The Trustees recommend that you vote

1.   For fixing the number of Trustees as proposed and the election of all
     nominees;

2.   For ratifying the selection of PricewaterhouseCoopers LLP as the
     independent auditors of your fund; and

3.   Against converting your fund from closed-end to open end status and
     authorizing certain related amendments to your fund's Agreement and
     Declaration of Trust.


                                       4
<PAGE>


>    Who is eligible to vote?

     Shareholders of record at the close of business on July 14, 2000 are
     entitled to be present and to vote at the meeting or any adjourned meeting.

     Each share is entitled to one vote. Shares represented by duly executed
     proxies will be voted in accordance with your instructions. If you sign the
     proxy, but don't fill in a vote, your shares will be voted in accordance
     with the Trustees' recommendations. If any other business is brought before
     your fund's meeting, your shares will be voted at the Trustees' discretion.


                                       5
<PAGE>

The Proposals

I.   ELECTION OF TRUSTEES

>    Who are the nominees for Trustees?

     The Board Policy and Nominating Committee of the Trustees of your fund
     makes recommendations concerning the Trustees of your fund. The Board
     Policy and Nominating Committee consists solely of Trustees who are not
     "interested persons" (as defined in the Investment Company Act of 1940) of
     your fund or of Putnam Investment Management, Inc., your fund's investment
     manager ("Putnam Management").

     The Board Policy and Nominating Committee of the Trustees of your fund
     recommends that the number of Trustees be fixed at 13 and that you vote for
     the election of the nominees described below. Each nominee is currently a
     Trustee of your fund and of the other Putnam funds.

     Pursuant to the bylaws of your fund and the Investment Company Act of 1940,
     holders of the preferred shares of your fund, voting as a class, are
     entitled to elect two nominees for Trustees. The holders of the preferred
     shares and the common shares of your fund, voting together as a single
     class, are entitled to vote for the remaining 11 of the 13 nominees.
     Therefore, Messrs. Hill and Patterson have been nominated as Trustees to be
     elected by the holders of the preferred shares, while the other 11 Trustees
     have been nominated to be elected by the holders of the preferred shares
     and common shares voting together as a single class.

>    Jameson Adkins Baxter

                                                [Photo of Jameson Adkins Baxter]

     Ms. Baxter, age 57, is the President of Baxter Associates, Inc., a
     management consulting and private investment firm that she founded in 1986.
     During that time, she was also a Vice President and Principal of the
     Regency Group, Inc. and a Consultant to First Boston Corporation, both of
     which are investment banking firms. From 1965 to 1986, Ms. Baxter held
     various positions in investment banking and corporate finance at First
     Boston.


                                       6
<PAGE>


     Nominees for Trustees

     Ms. Baxter currently also serves as a Director of Banta Corporation,
     Ryerson Tull and ASHTA Chemicals, Inc. She is also the Chairman Emeritus of
     the Board of Trustees of Mount Holyoke College, having previously served as
     Chairman for five years and as a Board member for thirteen years; an
     Honorary Trustee and past President of the Board of Trustees of the Emma
     Willard School; Member of the Board of Governors of Good Shepherd Hospital;
     and Chair of the National Center for Non-profit Boards. Ms. Baxter is a
     graduate of Mount Holyoke College.

>    Hans H. Estin

                                                        [Photo of Hans H. Estin]

     Mr. Estin, age 72, is a Chartered Financial Analyst and the Vice Chairman
     of North American Management Corp., a registered investment advisor serving
     individual clients and their families. Mr. Estin currently also serves as a
     Corporation Member of The Schepens Eye Research Institute and as a Trustee
     of New England Aquarium. He previously served as the Chairman of the Board
     of Trustees of Boston University and is currently active in various other
     civic associations, including the Boys & Girls Clubs of Boston, Inc. Mr.
     Estin is a graduate of Harvard College and holds honorary doctorates from
     Merrimack College and Boston University.

>    John A. Hill

[Photo of John A. Hill]


     Nominee for Trustee representing holders of preferred shares.

     Mr. Hill, age 58 is Chairman of the Trustees. He is the Vice-Chairman and
     Managing Director of First Reserve Corporation, a registered investment
     advisor investing in companies in the world-wide energy industry on behalf
     of institutional investors.


                                       7
<PAGE>


     Nominees for Trustees

     Prior to acquiring First Reserve in 1983, Mr. Hill held executive positions
     with several investment advisory firms and held various positions with the
     Federal government, including Associate Director of the Office of
     Management and Budget and Deputy Administrator of the Federal Energy
     Administration.

     Mr. Hill currently also serves as a Director of Santa Fe Snyder
     Corporation, an exploration and production company, TransMontaingne Oil
     Company, a refined oil product pipeline and distribution company and
     various private companies controlled by First Reserve Corporation. He is
     also a Member of the Board of Advisors of Fund Directions. He is currently
     active in various business associations, including the Economic Club of New
     York, and lectures on energy issues in the United States and Europe. Mr.
     Hill is a graduate of Southern Methodist University.

>    Ronald J. Jackson

                                                    [Photo of Ronald J. Jackson]

     Mr. Jackson, age 56, retired as Chairman of the Board, President and Chief
     Executive Officer of Fisher-Price, Inc., a major toy manufacturer, in 1993,
     a position which he held since 1990. He previously served as President and
     Chief Executive Officer of Stride-Rite, Inc., a manufacturer and
     distributor of footwear, from 1989 to 1990, and as President and Chief
     Executive Officer of Kenner Parker Toys, Inc., a major toy and game
     manufacturer, from 1985 to 1987. Prior to that, he held various financial
     and marketing positions at General Mills, Inc. from 1966 to 1985, including
     Vice President, Controller and Vice President of Marketing for Parker
     Brothers, a toy and game company, and President of Talbots, a retailer and
     direct marketer of women's apparel. Mr. Jackson is a graduate of Michigan
     State University Business School.


                                       8
<PAGE>


     Nominees for Trustees

>    Paul L. Joskow*

[Photo of Paul L. Joskow]

     Dr. Joskow, age 53, is Elizabeth and James Killian Professor of Economics
     and Director of the Center for Energy and Environmental Policy Research at
     the Massachusetts Institute of Technology. He has published five books and
     numerous articles on topics in industrial organization, government
     regulation of industry, and competition policy. Dr. Joskow currently serves
     as a Director of the New England Electric System, a public utility holding
     company, State Farm Indemnity Company, an automobile insurance company, and
     the Whitehead Institute for Biomedical Research, a non-profit research
     institution. He has been President of the Yale University Council since
     1993.

     Dr. Joskow is active on industry restructuring, environmental, energy,
     competition, and privatization policies and has served as an advisor to
     governments and corporations around the world.

     Dr. Joskow is a graduate of Cornell University and Yale University. He is a
     Fellow of the Econometric Society and the American Academy of Arts and
     Sciences.

>    Elizabeth T. Kennan

                                                  [Photo of Elizabeth T. Kennan]

     Dr. Kennan, age 62, is President Emeritus of Mount Holyoke College. From
     1978 through June 1995, she was President of Mount Holyoke College. From
     1966 to 1978, she was on the faculty of Catholic University, where she
     taught history, published numerous articles, and directed the post-doctoral
     programs in Patristic and Medieval Studies.

     Dr. Kennan currently serves as a Director of Northeast Utilities, Talbots
     and Cambus-Kenneth Bloodstock, a corporation involved in thoroughbred horse
     breeding and farming. She is a Member of The Folger Shakespeare Library
     Committee and a Trustee of Franklin Pierce College. Dr. Kennan previously
     served as a director of Bell Atlantic


                                       9
<PAGE>


     Nominees for Trustees

     Corporation, Chastain Real Estate, and Kentucky Home Life Insurance. Active
     in various educational and civic associations, Dr. Kennan is a graduate of
     Mount Holyoke College, the University of Washington, and St. Hilda's
     College, Oxford University. She holds several honorary doctorates.

>    Lawrence J. Lasser*

[Photo of Lawrence J. Lasser]

     Mr. Lasser, age 57, is a Vice President of your fund and each of the other
     Putnam funds. He has been the President, Chief Executive Officer and a
     Director of Putnam Investments, Inc. and Putnam Management since 1985,
     having begun his career there in 1969.

     Mr. Lasser currently also serves as a Director of Marsh & McLennan
     Companies, Inc., the parent company of Putnam Management. He is a Member of
     the Board of Directors of the United Way of Massachusetts Bay, a Member of
     the Board of Governors of the Investment Company Institute, a Trustee of
     the Museum of Fine Arts, Boston, a Trustee and Member of the Finance and
     Executive Committees of the Beth Israel Deaconess Medical Center, Boston
     and a Member of the CareGroup Board of Managers Investment Committee, the
     Council on Foreign Relations, and the Commercial Club of Boston. Mr. Lasser
     is a graduate of Antioch College and Harvard Business School.

>    John H. Mullin, III

                                                  [Photo of John H. Mullin, III]

     Mr. Mullin, age 59, is Chairman and CEO of Ridgeway Farm, a limited
     liability company engaged in timber activities and farming. Prior to
     establishing Ridgeway Farm in 1989, Mr. Mullin was a Managing Director of
     Dillon, Read & Co. Inc., an investment banking firm.

     Mr. Mullin currently serves as a Director of Graphic Packaging
     International Corp., a company engaged in the manufacture of packaging
     products; Alex. Brown Realty, Inc., a real estate investment company; CP&L
     Energy a public utility company; and The Liberty Corporation, a


                                       10
<PAGE>


     Nominees for Trustees

     company engaged in the life insurance and broadcasting industries. Mr.
     Mullin previously served as a Director of Dillon, Read & Co. Inc., Adolph
     Coors Company, Crystal Brands, Inc., Fisher-Price, Inc., Mattel, Inc. and
     The Ryland Group, Inc. Mr. Mullin is a Trustee Emeritus of Washington & Lee
     University where he served as Chairman of the Investment Committee. Mr.
     Mullin is a graduate of Washington & Lee University and The Wharton
     Graduate School at the University of Pennsylvania.

>    Robert E. Patterson

[Photo of Robert E. Patterson]

     Nominee for Trustee representing holders of preferred shares.

     Mr. Patterson, age 55, is the President and a Trustee of Cabot Industrial
     Trust, a publicly traded real estate investment trust. Prior to February
     1998, he was Executive Vice President and Director of Acquisitions of Cabot
     Partners Limited Partnership, a registered investment advisor which managed
     real estate investments for institutional investors. Prior to 1990, he was
     the Executive Vice President of Cabot, Cabot & Forbes Realty Advisors,
     Inc., the predecessor company of Cabot Partners. Prior to that, he was a
     Senior Vice President of the Beal Companies, a real estate management,
     investment and development company. He has also worked as an attorney and
     held various positions in state government, including the founding
     Executive Director of the Massachusetts Industrial Finance Agency.

     Mr. Patterson currently also serves as Chairman of the Joslin Diabetes
     Center, a Trustee of SEA Education Association and a Director of Brandywine
     Trust Company. Mr. Patterson is a graduate of Harvard College and Harvard
     Law School.


                                       11
<PAGE>


     Nominees for Trustees

>    George Putnam, III*

                                                   [Photo of George Putnam, III]

     Mr. Putnam, age 48, is the President of your fund and each of the other
     Putnam Funds. He is also the President of New Generation Research, Inc., a
     publisher of financial advisory and other research services relating to
     bankrupt and distressed companies, and New Generation Advisers, Inc., a
     registered investment advisor which provides advice to private funds
     specializing in investments in such companies. Prior to founding New
     Generation in 1985, Mr. Putnam was an attorney with the Philadelphia law
     firm Dechert Price & Rhoads.

     Mr. Putnam currently also serves as a Director of The Boston Family Office,
     L.L.C., a registered investment advisor that provides financial advice to
     individuals and families. He is also a Trustee of the SEA Education
     Association and St. Mark's School. Mr. Putnam is a graduate of Harvard
     College, Harvard Business School and Harvard Law School.

>    A.J.C. Smith*

[Photo of A.J.C. Smith]

     Mr. Smith, age 66, is a Director of Marsh & McLennan Companies, Inc. From
     May 1992 to November 1999, he served as the company's Chairman and Chief
     Executive Officer, and from November 1999 to May 2000, he served as
     Chairman. He has been employed by Marsh & McLennan and related companies in
     various capacities since 1961. Mr. Smith is a Director of the Trident
     Corp.; a Trustee of the Carnegie Hall Society, the Central Park
     Conservancy, the Educational Broadcasting Corporation, the Economic Club of
     New York, and the U.S. Chamber of Commerce; a Member of the Board of
     Overseers of the Joan and Sanford I. Weill Graduate School of Medical
     Sciences of Cornell University; and a Founder of the Museum of Scotland
     Society. He was educated in Scotland and is a Fellow of the Faculty of
     Actuaries in Edinburgh, a


                                       12
<PAGE>


     Nominees for Trustees

     Fellow of the Canadian Institute of Actuaries, a Fellow of the Conference
     of Actuaries, an Associate of the Society of Actuaries, a Member of the
     American Academy of Actuaries, the International Actuarial Association and
     the International Association of Consulting Actuaries.

>    W. Thomas Stephens

                                                   [Photo of W. Thomas Stephens]

     Mr. Stephens, age 57, was, until 1999, the President and Chief Executive
     Officer of MacMillan Bloedel Limited, a forest products and building
     materials company.

     In 1996, Mr. Stephens retired as Chairman of the Board of Directors,
     President and Chief Executive Officer of Johns Manville Corporation.

     Mr. Stephens serves as a Director for Qwest Communications, a
     communications company, New Century Energies, a public utility company,
     TransCanada Pipelines, and Fletcher Challenge Canada, a paper manufacturer.
     Mr. Stephens has B.S. and M.S. degrees from the University of Arkansas.

>    W. Nicholas Thorndike

[Photo of W. Nicholas Thorndike]

     Mr. Thorndike, age 67, serves as a Director of various corporations and
     charitable organizations, including Bradley Real Estate, Inc., a real
     estate investment firm, Providence Journal Co., a newspaper publisher, and
     Courier Corporation, a book binding and printing company. He is also a
     Trustee of Cabot Industrial Trust and Northeastern University, a member of
     the Advisory Board of New England Electric Systems, and an Honorary Trustee
     of Massachusetts General Hospital, where he previously served as chairman
     and president.

     Prior to December 1988, Mr. Thorndike was the Chairman of the Board and
     Managing Partner of Wellington Management Company/Thorndike, Doran, Paine &
     Lewis, a registered


                                       13
<PAGE>


     Nominees for Trustees

     investment advisor that manages mutual funds and institutional assets. He
     also previously served as a Trustee of the Wellington Group of Funds (now
     The Vanguard Group) and was the Chairman and a Director of Ivest Fund, Inc.
     Mr. Thorndike is a graduate of Harvard College.

     --------------------
    *Nominees who are or may be deemed to be "interested persons" (as defined in
     the Investment Company Act of 1940) of your fund, Putnam Management, and
     Putnam Retail Management, Inc. ("Putnam Retail Management"), the principal
     underwriter for all the open-end Putnam funds and an affiliate of Putnam
     Management. Messrs. Lasser, Putnam, III, and Smith are deemed "interested
     persons" by virtue of their positions as officers or affiliates of your
     fund, or directors of Putnam Management, Putnam Retail Management, or Marsh
     & McLennan Companies, Inc., the parent company of Putnam Management and
     Putnam Retail Management.

     Mr. Joskow is not currently an "interested person" of your fund but could
     be deemed by the Securities and Exchange Commission to be an "interested
     person" on account of his prior consulting relationship with National
     Economic Research Associates, Inc. a wholly-owned subsidiary of Marsh &
     McLennan Companies, Inc., which was terminated as of August 31, 1998.

     The balance of the nominees are not "interested persons."

     Except as indicated above, the principal occupations and business
     experience of the nominees for the last five years have been with the
     employers indicated, although in some cases they have held different
     positions with those employers.

     All the nominees were elected by the shareholders in October 1999. The 11
     nominees for election as Trustees by holders of the common and preferred
     shares, voting as a single class, at the shareholder meeting who receive
     the greatest number of votes from the preferred and common shareholders
     will be elected as Trustees of your fund. In addition, the two nominees for
     election as Trustees by holders of the preferred shares, voting as a single
     class, at the shareholder meeting who receive the greatest number of votes
     from the preferred


                                       14
<PAGE>


     shareholders will be elected as Trustees of your fund. The Trustees serve
     until their successors are elected and qualified. Each of the nominees has
     agreed to serve as a Trustee if elected. If any of the nominees is
     unavailable for election at the time of the meeting, which is not
     anticipated, the Trustees may vote for other nominees at their discretion,
     or the Trustees may fix the number of Trustees at less than 13 for your
     fund.

     The address for each of the current Trustees and each of the nominees is
     One Post Office Square, Boston, Massachusetts 02109.

>    What are the Trustees' responsibilities?

     Your fund's Trustees are responsible for the general oversight of your
     fund's business and for assuring that your fund is managed in the best
     interests of its shareholders. The Trustees periodically review your fund's
     investment performance as well as the quality of other services provided to
     your fund and its shareholders by Putnam Management and its affiliates,
     including administration, custody, and investor servicing. At least
     annually, the Trustees review the fees paid to Putnam Management and its
     affiliates for these services and the overall level of your fund's
     operating expenses. In carrying out these responsibilities, the Trustees
     are assisted by an independent administrative staff and by your fund's
     auditors and legal counsel, which are selected by the Trustees and are
     independent of Putnam Management and its affiliates.

>    Do the Trustees have a stake in your fund?

     The Trustees believe it is important that each Trustee have a significant
     investment in the Putnam funds. The Trustees allocate their investments
     among the more than 114 Putnam funds based on their own investment needs.
     The Trustees' aggregate investments in the Putnam funds total over $29
     million. The table below lists each Trustee's current investments in the
     fund and in the Putnam funds as a group based on beneficial ownership.
     Except as otherwise noted, each Trustee has sole voting power and sole
     investment power with respect to his or her shares.


                                       15
<PAGE>

Share Ownership by Trustees

                                  Number of shares owned as of May 31, 2000:

<TABLE>
<CAPTION>
                                       All
                        Year first     Putnam
                        elected as     funds             Putnam
                        Trustee of     (including        High Yield
                        the Putnam     notional          Municipal
Trustees                funds          shares)(1)(2)     Trust
--------------------------------------------------------------------------------
<S>                     <C>            <C>               <C>
Jameson A. Baxter       1994           161,048             129
Hans H. Estin           1972            35,915             200
John A. Hill            1985           231,092             100
Ronald J. Jackson       1996           165,186(3)          200(3)
Paul L. Joskow          1997            52,285             100
Elizabeth T. Kennan     1992            27,584(4)          150(4)
Lawrence J. Lasser      1992           521,035             100
John H. Mullin, III     1997            73,938             100
Robert E. Patterson     1984            91,400           6,800
George Putnam, III      1984           516,910             300
A.J.C. Smith            1986            46,333(5)          200(5)
W. Thomas Stephens      1997           139,100             100
W. Nicholas Thorndike   1992            85,531             184
</TABLE>

(1)These holdings do not include shares of Putnam money market funds.

(2)Notional shares represent economic interests in a fund acquired by the
   Trustees pursuant to the terms of the Trustee Compensation Deferral Plan,
   and they do not have any voting power. None of the Trustees held notional
   shares in your fund.

(3)Mr. Jackson has shared investment power and shared voting power with
   respect to such shares.

(4)Dr. Kennan is the custodian of a trust which owns all of these shares and
   in which she has no economic interest.

(5)Mr. Smith has shared investment power and shared voting power with respect
   to such shares.

As of May 31, 2000, the Trustees and officers of Putnam High Yield Municipal
Trust owned a total of 8,663 shares, comprising less than 1% of the outstanding
shares of such fund on that date. None of the Trustees own any of the fund's
preferred shares.


                                       16
<PAGE>


>    What are some of the ways in which the Trustees represent shareholder
     interests?

     The Trustees believe that, as substantial investors in the Putnam funds,
     their interests are closely aligned with those of individual shareholders.
     Among other ways, the Trustees seek to represent shareholder interests:

     o    by carefully reviewing your fund's investment performance on an
          individual basis with your fund's managers;

     o    by also carefully reviewing the quality of the various other services
          provided to the funds and their shareholders by Putnam Management and
          its affiliates;

     o    by discussing with senior management of Putnam Management steps being
          taken to address any performance deficiencies;

     o    by conducting an in-depth review of the fees paid by your fund and by
          negotiating with Putnam Management to ensure that such fees remain
          reasonable and competitive with those of other mutual funds, while at
          the same time providing Putnam Management sufficient resources to
          continue to provide high quality services in the future;

     o    by reviewing brokerage costs and fees, allocations among brokers, soft
          dollar expenditures and similar expenses of each fund;

     o    by monitoring potential conflicts between the funds and Putnam
          Management and its affiliates to ensure that the funds continue to be
          managed in the best interests of their shareholders; and

     o    by also monitoring potential conflicts among funds to ensure that
          shareholders continue to realize the benefits of participation in a
          large and diverse family of funds.

>    How often do the Trustees meet?

     The Trustees meet each month (except August) over a two-day period to
     review the operations of your fund and of the other Putnam funds. A portion
     of these meetings is devoted to


                                       17
<PAGE>


     meetings of various committees of the board which focus on particular
     matters. These currently include: the Contract Committee, which reviews all
     the contractual arrangements with Putnam Management and its affiliates; the
     Communication, Service and Marketing Committee, which reviews the quality
     of services provided by your fund's investor servicing agent and custodian;
     the Brokerage and Custody Committee, which reviews matters relating to
     custody of securities, best execution, brokerage costs and allocations and
     new investment techniques; the Audit Committee, which reviews procedures
     for the valuation of securities, the funds' accounting policies and the
     adequacy of internal controls and supervises the engagement of the funds'
     auditors; the Board Policy and Nominating Committee, which is composed of
     non-interested Trustees and which reviews the compensation of the Trustees
     and their administrative staff, supervises the engagement of the funds'
     independent counsel and selects nominees for election as Trustees; the
     Distribution and Closed-End Funds Committee, which is responsible for
     reviewing special issues applicable to closed-end funds such as your fund,
     and the Pricing Committee, which reviews procedures for the valuation of
     securities.

     Each Trustee generally attends at least two formal committee meetings
     during each regular meeting of the Trustees. During 1999, the average
     Trustee participated in approximately 40 committee and board meetings. In
     addition, the Trustees meet in small groups with Chief Investment Officers
     and Portfolio Managers to review recent performance and the current
     investment climate for selected funds. These meetings ensure that your
     fund's performance is reviewed in detail at least twice a year. The
     Contract Committee typically meets on several additional occasions during
     the year to carry out its responsibilities. Other committees, including an
     Executive Committee, may also meet on special occasions as the need arises.


                                       18
<PAGE>


>    What are the Trustees paid for their services?

     Each Trustee of your fund receives a fee for his or her services. Each
     Trustee also receives fees for serving as Trustee of the other Putnam
     funds. The Trustees periodically review their fees to assure that such fees
     continue to be appropriate in light of their responsibilities as well as in
     relation to fees paid to trustees of other mutual fund complexes. The Board
     Policy and Nominating Committee, which consists solely of Trustees not
     affiliated with Putnam Management, estimates that committee and Trustee
     meeting time, together with the appropriate preparation, requires the
     equivalent of at least three business days per Trustee meeting. The
     following table shows the fees paid to each Trustee by the fund for its
     most recent fiscal year and the fees paid to each Trustee by all of the
     Putnam funds during calendar year 1999:


                                       19
<PAGE>


PUTNAM HIGH YIELD MUNICIPAL TRUST

Compensation Table

<TABLE>
<CAPTION>
                                                    Estimated
                                       Pension or   annual
                                       retirement   benefits
                                       benefits     from all
                        Aggregate      accrued as   Putnam          Total
                        compensation   part of      funds           compensation
                        from the       fund         upon            from all
Trustee                 fund(1)        expenses     retirement(2)   Putnam funds(3)
------------------------------------------------------------------------------------
<S>                        <C>           <C>          <C>             <C>
Jameson A. Baxter          $651          $126         $ 95,000        $191,000(4)
Hans H. Estin               647           295           95,000         190,000
John A. Hill                693           148          115,000         239,750(4)(5)
Ronald J. Jackson           651           155           95,000         193,500(4)
Paul L. Joskow              647            55           95,000         191,000(4)
Elizabeth T. Kennan         647           187           95,000         190,000
Lawrence J. Lasser          644           143           95,000         189,000
John H. Mullin, III         649            83           95,000         196,000(4)
Robert E. Patterson         647            99           95,000         190,250
George Putnam, III          647            68           95,000         190,000
A.J.C. Smith                640           213           95,000         188,000
W. Thomas Stephens          634            77           95,000         188,000(4)
W. Nicholas Thorndike       644           263           95,000         190,000
------------------------------------------------------------------------------------
</TABLE>

(1)Includes an annual retainer and an attendance fee for each meeting
   attended.

(2)Assumes that each Trustee retires at the normal retirement date. Estimated
   benefits for each Trustee are based on Trustee fee rates in effect during
   calendar 1999.

(3)As of December 31, 1999, there were 114 funds in the Putnam family.

(4)Includes compensation deferred pursuant to a Trustee Compensation Deferral
   Plan.

(5)Includes additional compensation for service as Vice Chairman of the Putnam
   funds. Mr. Hill became Chairman of the Board of Trustees on July 1, 2000.


                                       20
<PAGE>


     Under a Retirement Plan for Trustees of the Putnam funds (the "Plan"), each
     Trustee who retires with at least five years of service as a Trustee of the
     funds is entitled to receive an annual retirement benefit equal to one-half
     of the average annual compensation paid to such Trustee by the funds for
     the last three years of service prior to retirement. This retirement
     benefit is payable during a Trustee's lifetime, beginning the year
     following retirement, for a number of years equal to such Trustee's years
     of service compensated by the funds. A death benefit is also available
     under the Plan which assures that the Trustee and his or her beneficiaries
     will receive benefit payments for the lesser of an aggregate period of (i)
     ten years or (ii) such Trustee's total years of service.

     The Plan Administrator (a committee comprised of Trustees that are not
     "interested persons" of the fund, as defined in the Investment Company Act
     of 1940) may terminate or amend the Plan at any time, but no termination or
     amendment will result in a reduction in the amount of benefits (i)
     currently being paid to a Trustee at the time of such termination or
     amendment, or (ii) to which a current Trustee would have been entitled had
     he or she retired immediately prior to such termination or amendment.

     For additional information about your fund, including further information
     about its Trustees and officers, please see "Fund Information," on page 38.

2.   RATIFICATION OF INDEPENDENT AUDITORS

     PricewaterhouseCoopers LLP, 160 Federal Street, Boston, Massachusetts
     02110, independent accountants, has been selected by the Trustees as the
     independent auditors of your fund for the current fiscal year. The Audit
     Committee of the Board of Trustees unanimously approved the selection of
     PricewaterhouseCoopers LLP in March of 2000, and the Trustees unanimously
     approved such selection in April of 2000. Among the country's preeminent
     accounting firms, this firm also serves as the auditor for various other
     funds in the Putnam family. It


                                       21
<PAGE>


     was selected primarily on the basis of its expertise as auditors of
     investment companies, the quality of its audit services, and the
     competitiveness of its fees.

     A majority of the votes on the matter is necessary to ratify the selection
     of auditors. A representative of the independent auditors is expected to be
     present at the meeting to make statements and to respond to appropriate
     questions.

3.   APPROVAL OR DISAPPROVAL OF THE CONVERSION OF YOUR FUND FROM CLOSED-END TO
     OPEN-END STATUS AND CERTAIN RELATED AMENDMENTS TO YOUR FUND'S AGREEMENT AND
     DECLARATION OF TRUST

>    What is being considered under this item?

     Shareholders will have the opportunity to vote at the meeting on the
     question of whether your fund should be converted from a closed-end fund to
     an open-end fund. The Trustees, as discussed in more detail below,
     unanimously recommend that shareholders vote against converting your fund
     to an open-end fund. This recommendation is based on the Trustees' view
     that, as a closed-end fund, your fund is afforded significant investment
     advantages.

     If approved, the conversion would result in the "delisting" of your fund's
     shares from the New York Stock Exchange where they currently may be bought
     or sold at prevailing market prices. All preferred shares of the fund would
     be redeemed for cash immediately prior to the conversion. All common shares
     would then become redeemable directly from your fund at net asset value,
     eliminating any discount of market price to net asset value. Other
     differences between closed-end and open-end investment companies are
     described below.

     A conversion from closed-end to open-end status would also require a number
     of changes in the Agreement and Declaration of Trust (the "Declaration of
     Trust") under which your fund was established. Accordingly, approval of
     this proposal


                                       22
<PAGE>


     would also authorize your fund's Trustees to make such amendments as they
     may deem necessary to operate your fund in open-end form if this proposal
     is approved. These changes are described in greater detail below.

>    Why is this question being submitted to shareholders now?

     Your fund's governing legal documents require that shareholders of your
     fund be given the opportunity to vote on a proposal to convert your fund
     from closed-end to open-end status if the fund's shares have traded at an
     average discount of more than 10% from their net asset value during the
     last twelve calendar weeks of the preceding fiscal year (measured as of the
     last trading day in each such week). For the twelve-week period ended March
     31, 2000, your fund's shares traded at an average discount of 11.05%,
     requiring that this proposal be submitted to shareholders.

>    What is the recommendation of the Trustees?

     The Trustees regularly review the overall performance and trading
     information for your fund and all of the Putnam closed-end funds. At
     meetings held in May and June of this year, the Trustees of your fund
     carefully evaluated the fund's investment performance, the trading history
     of its shares since its inception in May 1989, and information about the
     possible advantages and disadvantages of converting to an open-end fund.
     For the reasons described below, the Trustees of your fund have unanimously
     concluded that the conversion of your fund to open-end status would not be
     in the best long-term interests of shareholders. Accordingly, the Trustees
     of your fund unanimously recommend that shareholders vote "AGAINST" this
     proposal.

>    Why are the Trustees recommending a vote against a conversion?

     The Trustees of your fund are recommending a vote against converting your
     fund to open-end status for the following reasons:


                                       23
<PAGE>


     o    The Trustees believe that your fund's closed-end status provides
          investment benefits not available to open-end fund investors. Because
          your fund's shares are not redeemable, your fund is not required to
          maintain short-term, lower-yielding investments in anticipation of
          possible redemptions, but can be fully invested in higher-yielding
          securities in pursuit of the fund's investment objective.

     o    Furthermore, as a closed-end fund, your fund does not experience the
          cash flows associated with sales and redemptions of open-end fund
          shares. As a result, your fund's portfolio manager does not have to
          invest additional cash from new sales at times when market conditions
          are unfavorable or sell securities to meet redemptions at inopportune
          times.

     o    As a closed-end fund, your fund is permitted to issue, and has issued,
          preferred shares. This provides holders of common shares with the
          benefits and risks of leverage. The fund has the potential to increase
          the return and the yield on your investment if the fund's return on
          its portfolio and interest on its assets exceeds the dividend rate
          paid to holders of preferred shares. Open-end funds do not have the
          ability to issue a preferred class of shares. Consequently, your fund
          would lose the benefits of this flexibility upon conversion.

     o    The Trustees believe that your fund's operating expenses are likely to
          increase if it is converted to open-end status. As an open-end fund,
          your fund would be required, as a practical matter, to make a
          continuous public offering of its shares in order to offset
          redemptions and maintain the economies of scale available at its
          current size. The Trustees expect that in order to market your fund's
          shares effectively and to conform generally to sales practices of
          competing dealer-sold funds, following a conversion to open-end
          status, the Trustees would likely recommend that shareholders approve
          the adoption of a distribution plan under Rule 12b-1. Such a plan
          would permit


                                       24
<PAGE>


          your fund to pay annual distribution fees of up to 0.35% of your
          fund's net assets. If such a distribution plan were approved, the
          Trustees would expect to authorize the payment of distribution fees at
          the annual rate of 0.20% of net assets, as is the case with similar
          open-end Putnam funds. In addition, all shareholders would bear the
          brokerage and other transactional costs associated with purchases and
          sales of securities by your fund in response to the sale or redemption
          of shares if your fund were converted to open-end status (except to
          the extent that the Trustees decide to impose a temporary redemption
          fee, as described below).

     o    It is possible that redemptions by shareholders would cause your fund
          to shrink following conversion to open-end status, and, everything
          else being equal, thereby resulting in an increase of expense ratio
          for the remaining shareholders. However, open-end funds, which
          continually offer new shares to the public, also have the ability to
          increase in size. Growth in your fund's size could result in
          efficiencies and spread fixed costs over a larger pool of assets.
          Putnam Management has advised the Trustees that it is likely that your
          fund would experience significant net redemptions following any
          conversion, thereby shrinking in size. Depending on the size of future
          redemptions or sales, increased expense ratios could result for either
          temporary or indefinite periods.

     o    The need to sell securities to meet redemptions may have adverse tax
          consequences to shareholders remaining in your fund. If your fund
          sells securities to meet redemptions and realizes a gain for tax
          purposes, your fund will be required to make capital gain
          distributions and allocate the tax gain to all shareholders, not
          simply to those redeeming.

     o    Converting the fund to open-end status would eliminate the possibility
          that your shares could be sold at a premium. Although your fund's
          shares traded at a discount to their net asset value earlier this
          year, more recently and for most of


                                       25
<PAGE>


          your fund's history its shares have traded at a premium above their
          net asset value. On August 11, 2000, your fund's shares traded at a
          4.04% premium. If the fund were converted, you would not benefit from
          any possible premium.

     o    In light of the potential loss of the advantages of closed-end status,
          including redemption of the preferred shares, and the potential
          increase of expenses that would likely follow, conversion is likely to
          result in a lower yield for the shareholders. This result is
          inconsistent with the fund's investment objective of seeking high
          current income exempt from federal income tax.

     The Trustees believe that most shareholders of your fund purchased their
     shares with a long-term investment perspective that recognizes the special
     advantages of the closed-end structure as well as the disadvantages of
     potential discounts. Consequently, the Trustees do not believe that recent
     discount levels should be viewed as grounds for depriving shareholders of
     the advantages of the closed-end structure, especially in light of the fact
     that, although there can be no guarantee as to the future, historically the
     fund's shares have traded at a premium for most of its life.

>    Are there any advantages to converting the fund to open-end status?

     Yes. If the fund's shares were trading at a discount at the time of
     conversion, the ability to redeem your shares at their net asset value less
     any redemption fee that the Trustees may impose would represent a potential
     one-time increase in the value of your shares. As noted above, the fund's
     shares have recently traded at a premium.

     The Trustees have also considered the potential decrease in expense ratio
     that would arise if your fund grows in size as a result of net sales of new
     shares. As an open-end fund your fund would constantly be offering new
     shares to the public. If more new shares are sold than redeemed, the fund
     could grow


                                       26
<PAGE>


     in size, resulting in a lower expense ratio. As stated above, Putnam
     Management has advised the Trustees that Putnam Management does not expect
     that the fund would grow in size following a conversion to open-end status.

     After considering the reasons set forth above, the Trustees do not believe
     that recent discounts justify the fundamental changes that would result
     from a conversion to open-end status. The Trustees unanimously recommend
     that shareholders vote against this proposal.

>    How has your fund performed?

     The following table summarizes the annualized total return of your fund for
     the periods shown based on the net asset value and the market value of its
     shares:

     Total Return (Annualized) Through June 30, 2000

<TABLE>
<CAPTION>
                    1 year        3 years     5 years     10 years
--------------------------------------------------------------------------------
<S>                <C>             <C>          <C>         <C>
Net Asset Value      -1.96%         2.65%       4.81%       6.65%
Market Value        -25.27%        -3.26%       2.47%       5.95%
</TABLE>

     Of course, relative performance is also important. In addition to reviewing
     the fund's overall performance, the Trustees regularly review the fund's
     performance compared to that of a group of comparable funds. To compare the
     funds, the Trustees use a formula that assigns a weighting to three
     factors: yield, total return and risk. Based on this formula, as of
     December 31, 1999 your fund ranked second out of twelve or in the top 15%
     of funds in its peer group.

>    What are the principal differences between a closed-end and open-end fund?

     In evaluating this proposal, shareholders may wish to consider the
     following differences between closed-end and open-end funds:

     o    Changes in capital. Closed-end funds raise their capital through an
          initial public offering and generally do not raise


                                       27
<PAGE>


          additional capital after that time. Closed-end funds therefore have
          limited opportunities to gain additional economies of scale through
          growth of assets. At the same time, because shares of closed-end funds
          cannot be redeemed, the risk of higher expense ratios resulting from a
          decline in assets is also limited.

          Open-end funds, in contrast, generally engage in a continuous public
          offering of their shares, which provides the opportunity for growth of
          assets and reduced expense ratios. However, because shares of open-end
          funds are generally redeemable at any time, such funds face the risk
          of higher expense ratios if significant redemptions are not offset by
          sales of new shares.

     o    Sale of shares. Shares of open-end funds may be redeemed at any time
          at their net asset value (subject only to the right of the fund to
          withhold payment for up to seven days or, with the permission of the
          SEC, to suspend redemptions under emergency conditions). In contrast,
          shares of closed-end funds are not redeemable and can generally be
          bought and sold at current market prices only on the exchange on which
          such funds are listed. Thus, converting your fund from closed-end to
          open-end status would eliminate any then current premium or discount
          between market price and net asset value.

     o    Leverage. Open-end funds are not permitted to sell a class of senior
          or preferred securities, and a fund that is converted from closed-end
          to open-end status would be required to redeem any of its outstanding
          preferred shares. A closed-end fund can use the leverage provided by a
          class of senior or preferred securities to increase the yield on the
          investment of a common shareholder. An investment in common shares of
          a fund that uses leverage also involves a risk of lower yields if the
          fund's return on its portfolio and income on other assets is lower
          than the dividend rate payable to the fund's preferred shareholders.


                                       28
<PAGE>


     o    Regulatory requirements. Both closed-end and open-end funds are
          registered with the SEC under the Investment Company Act of 1940 and,
          with certain differences relating largely to the sale and redemption
          of shares, are generally subject to the same regulatory requirements
          of that Act. Your fund's shares are listed for trading on the New York
          Stock Exchange. That listing would be terminated in the event of a
          conversion to open-end status. Since open-end funds generally engage
          in a continuous public offering of their shares they are required to
          maintain current registrations under federal and state securities
          laws, which involves additional costs.

     o    Annual shareholder meetings. Your fund is currently required by the
          rules of the New York Stock Exchange to hold annual meetings of
          shareholders for the purpose of electing Trustees and ratifying the
          selection of auditors. As noted above, conversion of your fund to
          open-end status would result in termination of the fund's listing on
          the New York Stock Exchange with the result that your fund would no
          longer be required to hold annual meetings. In such event, your fund
          expects that meetings would be held only on an as-needed basis.

     o    Investment flexibility. As noted above, the cash flows associated with
          sales and redemptions of open-end fund shares, as well as the need to
          maintain cash reserves in anticipation of possible redemptions, might
          tend to reduce the investment flexibility of open-end funds.

     o    Shareholder privileges. Shareholders of your fund currently have the
          option of participating in the fund's Dividend Reinvestment Plan,
          under which cash distributions paid by your fund are generally
          reinvested through the purchase of additional fund shares at market
          prices, which currently reflect a discount from net asset value. (At
          times when your fund's shares are trading at a premium over their net
          asset value, such reinvestments are made at the higher


                                       29
<PAGE>


          of net asset value or 95% of market value.) If the fund were to
          convert to open-end status, shareholders would no longer be able to
          reinvest dividends at a price below net asset value per share.
          Shareholders of open-end Putnam funds have the option to reinvest
          their distributions in additional shares at net asset value at all
          times.

          Shareholders of open-end funds in the Putnam family of funds currently
          have the privilege of exchanging their investment at net asset value
          and without sales charges for shares of more than 75 open-end funds in
          the Putnam group. Shareholders of your fund currently do not have that
          privilege.

>    What other possible consequences might result from conversion of your fund
     to open-end status?

     In addition to those matters described above, you should consider the
     following possible consequences of conversion of your fund to open-end
     status:

     o    Certain legal, accounting and other costs would be incurred in
          connection with the conversion of your fund to open-end status.
          Although it is difficult to estimate these costs with precision, these
          costs are estimated to be at least $100,000. Based on your fund's
          current size it is not anticipated that these costs would materially
          increase your fund's expense ratio.

     o    The Trustees reserve the right to impose a temporary redemption fee of
          up to 2.00% of the value of shares redeemed for a period of up to one
          year following the fund's conversion to an open-end investment
          company. The Trustees may impose this fee if they believe that
          immediately following a conversion to open-end status there would
          likely be significant redemptions of shares that would disrupt
          long-term portfolio management of the fund and dilute the interests of
          the remaining shareholders. Imposition of a redemption fee may deter
          certain redemptions and would compensate remaining long-term
          shareholders for the costs of the liquidation of a significant
          percentage of the fund's portfolio.


                                       30
<PAGE>


          The fund will notify shareholders in writing prior to the imposition
          of any temporary redemption fee.

>    What changes would be made in your fund's Declaration of Trust if
     shareholders vote to convert the fund to open-end status?

     Conversion of your fund from a closed-end to an open-end fund would require
     certain changes to your fund's Declaration of Trust and, therefore, a vote
     in favor of such conversion would also authorize the Trustees to amend your
     fund's Declaration of Trust to reflect such changes. These changes would
     bring your fund's Declaration of Trust more in line with most other Putnam
     open-end funds.

     The Declaration of Trust would be amended to require your fund to purchase
     all shares offered to it for redemption at a price equal to the net asset
     value of the shares next determined, less any redemption or sales charge
     fixed by the Trustees. In addition, the fund would be authorized, at its
     option, to redeem shares held in a shareholder's account at net asset value
     if at any time a shareholder owned shares in an amount either less than or
     greater than, as the case may be, an amount determined by the Trustees.
     Notwithstanding this provision, all shares would be redeemable at a
     shareholder's option.

     The Declaration of Trust would also be amended to eliminate certain
     provisions that relate specifically to the fund's closed-end status, such
     as the conversion provision that has necessitated this proposal.

     Finally, the Trustees would also make certain necessary technical and
     non-material changes to the Declaration of Trust and conforming changes to
     your fund's Bylaws if the shareholders vote in favor of the conversion.

>    What percentage of shareholders' votes are required to approve the
     conversion?

     Approval of the conversion of your fund to open-end status and of the
     related amendments to your fund's Declaration of Trust will require the
     "yes" vote of both the holders of a majority of


                                       31
<PAGE>


     your fund's outstanding common shares entitled to vote and the holders of a
     majority of your fund's outstanding preferred shares entitled to vote, each
     voting separately as a class.

     If such conversion were approved, the conversion would become effective
     following compliance with all necessary regulatory requirements under
     federal and state law. Your fund would seek to complete this process as
     soon as reasonably practicable, but it is estimated that this process may
     require at least several months.

>    If the conversion is not approved, will the fund continue in its current
     form?

     Yes. In the event that shareholders do not approve the conversion of your
     fund to open-end status, your fund would continue to operate as a
     closed-end fund. Shareholders would be given the opportunity to vote on a
     proposed conversion to open-end status in future years if your fund's
     shares again trade at discounts sufficient to meet the requirement of the
     Declaration of Trust described above.

     The Trustees believe that the continued operation of your fund as a
     closed-end fund is in the best long-term interests of shareholders, and
     unanimously recommend a vote against the conversion of your fund to
     open-end status at this time.

     The Trustees recommend that you vote "AGAINST" Proposal 3.


                                       32
<PAGE>


Further Information About Voting and the Meeting

     Quorum and Methods of Tabulation. A majority of the shares entitled to
     vote--present in person or represented by proxy--constitutes a quorum for
     the transaction of business with respect to any proposal at the meeting
     (unless otherwise noted in the proxy statement), except that where the
     preferred shares or common shares shall vote as a separate class, then a
     majority of the aggregate number of shares of that class shall be necessary
     to constitute a quorum for the transaction of business by that class.
     Shares represented by proxies that reflect abstentions and "broker
     non-votes" (i.e., shares held by brokers or nominees as to which (i)
     instructions have not been received from the beneficial owners or the
     persons entitled to vote and (ii) the broker or nominee does not have the
     discretionary voting power on a particular matter) will be counted as
     shares that are present and entitled to vote on the matter for purposes of
     determining the presence of a quorum. Votes cast by proxy or in person at
     the meeting will be counted by persons appointed by your fund as tellers
     for the meeting.

     The tellers will count the total number of votes cast "for" approval of the
     proposals for purposes of determining whether sufficient affirmative votes
     have been cast. With respect to the election of Trustees and selection of
     auditors, neither abstentions nor broker non-votes have any effect on the
     outcome of the proposal. With respect to any other proposals, abstentions
     and broker non-votes have the effect of a negative vote on the proposal.

     Special Rule for Proportional Voting. In accordance with New York Stock
     Exchange rules, brokerage firms may vote for or against a proposal, on
     behalf of their clients who beneficially own remarketed preferred shares
     and from whom they have not received voting instructions, in the same
     proportion as votes for and against such proposal have been received from
     holders of preferred shares if (i) the holders of a minimum of 30% of the
     outstanding preferred shares have been


                                       33
<PAGE>


     voted by the holders of preferred shares, (ii) holders of less than 10% of
     the outstanding preferred shares have voted against such proposal and (iii)
     the holders of the common shares have approved such proposal.

     The tellers will count the total number of votes cast "for" approval of the
     proposals for purposes of determining whether sufficient affirmative votes
     have been cast. With respect to the election of Trustees and selection of
     auditors, neither abstentions nor broker non-votes have any effect on the
     outcome of the proposal. With respect to any other proposals, abstentions
     and broker non-votes have the effect of a negative vote on the proposal.

     Other business. The Trustees know of no other business to be brought before
     the meeting. However, if any other matters properly come before the
     meeting, it is their intention that proxies that do not contain specific
     restrictions to the contrary will be voted on such matters in accordance
     with the judgment of the persons named as proxies in the enclosed form of
     proxy.

     Solicitation of proxies. In addition to soliciting proxies by mail,
     Trustees of your fund and employees of Putnam Management, Putnam Fiduciary
     Trust Company and Putnam Retail Management may solicit proxies in person or
     by telephone. Your fund may also arrange to have voting instructions
     recorded by telephone. The telephone voting procedure is designed to
     authenticate shareholders' identities, to allow them to authorize the
     voting of their shares in accordance with their instructions and to confirm
     that their instructions have been properly recorded. Your fund has been
     advised by counsel that these procedures are consistent with the
     requirements of applicable law. If these procedures were subject to a
     successful legal challenge, such votes would not be counted at the meeting.
     Your fund is unaware of any such challenge at this time. Shareholders would
     be called at the phone number Putnam Investments has in its records for
     their accounts, and would be asked for their Social Security number or
     other identifying information. The shareholders would then be given


                                       34
<PAGE>


     an opportunity to authorize proxies to vote their shares at the meeting in
     accordance with their instructions. To ensure that the shareholders'
     instructions have been recorded correctly, they will also receive a
     confirmation of their instructions in the mail. A special toll-free number
     will be available in case the information contained in the confirmation is
     incorrect.

     Holders of common shares of the fund may have the opportunity to submit
     their voting instructions via the Internet by utilizing a program provided
     by a third party vendor hired by Putnam Management. The giving of such a
     proxy will not affect your right to vote in person should you decide to
     attend the meeting. To vote via the Internet, you will need the 14-digit
     "control" number that appears on your proxy card. To use the Internet,
     please access the Internet address found on your proxy card on the World
     Wide Web. The Internet voting procedures are designed to authenticate
     shareholder identities, to allow shareholders to give their voting
     instructions, and to confirm that shareholders' instructions have been
     recorded properly. Shareholders voting via the Internet should understand
     that there may be costs associated with Internet access, such as usage
     charges from Internet access providers and telephone companies, that must
     be borne by the shareholders.

     Your fund's Trustees have adopted a general policy of maintaining
     confidentiality in the voting of proxies. Consistent with that policy, your
     fund may solicit proxies from shareholders who have not voted their shares
     or who have abstained from voting.

     Persons holding shares as nominees will upon request be reimbursed for
     their reasonable expenses in soliciting instructions from their principals.
     Your fund has retained at its expense D. F. King & Co., Inc., 77 Water
     Street, New York, New York 10005, to aid in the solicitation instructions
     for nominee accounts, for a fee not to exceed $3,500 plus reasonable
     out-of-pocket expenses for mailing and phone costs. The


                                       35
<PAGE>


     expenses of the preparation of proxy statements and related materials,
     including printing and delivery costs, are borne by your fund.

     Revocation of proxies. Proxies, including proxies given by telephone or
     over the Internet, may be revoked at any time before they are voted either
     (i) by a written revocation received by the Associate Clerk of your fund,
     (ii) by properly executing a later-dated proxy, (iii) by recording
     later-dated voting instructions via the Internet or (iv) by attending the
     meeting and voting in person.

     Date for receipt of shareholders' proposals for the next annual meeting. It
     is currently anticipated that your fund's next annual meeting of
     shareholders will be held in October 2001. Shareholder proposals to be
     included in the proxy statement for that meeting must be received by your
     fund before March 28, 2001. Shareholders who wish to make a proposal at the
     2001 annual meeting--other than one that will be included in the fund's
     proxy materials--should notify the fund no later than June 5, 2001. The
     Board Policy and Nominating Committee will also consider nominees
     recommended by shareholders of the fund to serve as Trustees, provided that
     shareholders submit their recommendations by the above date. If a
     shareholder who wishes to present a proposal fails to notify the fund by
     that date, the proxies solicited for the meeting will have discretionary
     authority to vote on the shareholder's proposal if it is properly brought
     before the meeting. If a shareholder makes a timely notification, the
     proxies may still exercise discretionary voting authority under
     circumstances consistent with the SEC's proxy rules.

     Adjournment. If sufficient votes in favor of any of the proposals set forth
     in the Notice of the Meeting are not received by the time scheduled for the
     meeting, the persons named as proxies may propose adjournments of the
     meeting for a period or periods of not more than 60 days in the aggregate
     to permit


                                       36
<PAGE>


     further solicitation of proxies with respect to those proposals. Any
     adjournment will require the affirmative vote of a majority of the votes
     cast on the question in person or by proxy at the session of the meeting to
     be adjourned. The persons named as proxies will vote in favor of
     adjournment those proxies that they are entitled to vote in favor of such
     proposals. They will vote against adjournment those proxies required to be
     voted against such proposals. Your fund pays the costs of any additional
     solicitation and of any adjourned session. Any proposals for which
     sufficient favorable votes have been received by the time of the meeting
     may be acted upon and considered final regardless of whether the meeting is
     adjourned to permit additional solicitation with respect to any other
     proposal.

     Financial information. Your fund's most recent Annual Report dated March
     31, 2000 and filed with the Securities and Exchange Commission on May 18,
     2000 is hereby incorporated by reference into this Proxy Statement. Your
     fund will furnish to you upon request and without charge, a copy of the
     fund's annual report for its most recent fiscal year, and a copy of its
     semiannual report for any subsequent semiannual period. Such requests may
     be directed to Putnam Investor Services, P.O. Box 41203, Providence, RI
     02940-1203 or 1-800-225-1581.


                                       37
<PAGE>


Fund Information

     Putnam Investments. Putnam Investment Management, Inc., the fund's
     investment manager, and its affiliates, Putnam Retail Management, Inc., the
     fund's principal underwriter, and Putnam Fiduciary Trust Company, the
     fund's investor servicing agent and custodian (collectively, the "Putnam
     companies"), are owned by Putnam Investments, Inc., a holding company that
     is, except for a minority stake owned by employees, is in turn owned by
     Marsh & McLennan Companies, Inc., a leading professional services firm that
     includes risk and insurance services, investment management and consulting
     businesses. The address of Putnam Investments, Inc. and each of the Putnam
     companies is One Post Office Square, Boston, Massachusetts 02109. The
     address of the executive offices of Marsh & McLennan Companies, Inc. is
     1166 Avenue of the Americas, New York, New York 10036.

     Limitation of Trustee liability. The Declaration of Trust of your fund
     provides that the fund will indemnify its Trustees and officers against
     liabilities and expenses incurred in connection with litigation in which
     they may be involved because of their offices with the fund, except if it
     is determined in the manner specified in the Declaration of Trust that they
     have not acted in good faith in the reasonable belief that their actions
     were in the best interests of the fund or that such indemnification would
     relieve any officer or Trustee of any liability to the fund or its
     shareholders arising by reason of willful misfeasance, bad faith, gross
     negligence or reckless disregard of his or her duties. Your fund, at its
     expense, provides liability insurance for the benefit of its Trustees and
     officers.

     Audit Committee and Board Policy and Nominating Committee. The members of
     the Audit Committee of your fund include only Trustees who are not
     "interested persons" of the fund or Putnam Management. The Audit Committee
     currently consists of Dr. Kennan and Messrs. Estin, Mullin and Stephens
     (Chairman). The Board Policy and Nominating Committee


                                       38
<PAGE>


     consists only of Trustees who are not "interested persons" of your fund or
     Putnam Management. The Board Policy and Nominating Committee currently
     consists of Dr. Kennan (Chairperson), Messrs. Hill, Patterson and
     Thorndike. During the fund's last fiscal year, the Audit Committee met
     seven times, and the Board Policy and Nominating Committee met six times.

     Officers and other information. All of the officers of your fund are
     employees of Putnam Management or its affiliates. Because of their
     positions with Putnam Management or its affiliates or their ownership of
     stock of Marsh & McLennan Companies, Inc., the parent corporation of Putnam
     Management and Putnam Retail Management, Messrs. Putnam, III, Lasser and
     Smith (nominees for Trustees of your fund), as well as the officers of your
     fund, will benefit from the management fees, custodian fees, and investor
     servicing fees paid or allowed by the fund. In addition to George Putnam,
     III and Lawrence J. Lasser, the officers of your fund are as follows:

     Putnam High Yield Municipal Trust

<TABLE>
<CAPTION>
                                                            Year first
                                                            elected to
Name (age)                     Office                       office
--------------------------------------------------------------------------------
<S>                            <C>                          <C>
Charles E. Porter (61)         Executive Vice President     1989
Patricia C. Flaherty (53)      Senior Vice President        1993
John D. Hughes (65)            Senior Vice President
                                & Treasurer                 1989
Gordon H. Silver (52)          Vice President               1990
Blake E. Anderson* (43)        Vice President               1996
Richard A. Monaghan** (45)     Vice President               1999
John R. Verani (60)            Vice President               1989
--------------------------------------------------------------------------------
</TABLE>

 *The fund's portfolio manager
**President of Putnam Retail Management


                                       39
<PAGE>


<TABLE>
<CAPTION>
Assets and shares outstanding of your fund as of May 31, 2000
----------------------------------------------------------------------------
<S>                                                  <C>
Net assets                                           $176,251,245.80
----------------------------------------------------------------------------
Common shares outstanding and authorized to vote       22,161,671.688 shares

Preferred shares outstanding and authorized to vote               900 shares


5% beneficial ownership of your fund as of May 31, 2000
----------------------------------------------------------------------------

Persons beneficially owning more than 5% of the fund's shares           none
</TABLE>


                                       40
<PAGE>



PUTNAM INVESTMENTS [logo]

       The Putnam Funds
       One Post Office Square
       Boston, Massachusetts 02109
       Toll-free 1-800-225-1581


                                                                      62708 8/00

<PAGE>


PUTNAMINVESTMENTS                                                        (Logo)
                     P.O. Box 9131
                     Hingham, MA 02043-9131

FOR YOUR CONVENIENCE YOU MAY RECORD YOUR VOTING INSTRUCTIONS VIA THE INTERNET OR
BY RETURNING THIS PROXY CARD BY MAIL

Your vote is very important. If you choose to record your voting instructions
via the Internet, visit the website at www.proxyweb.com/Putnam. Please refer to
the instructions below. Your voting instructions will be immediately confirmed
if you provide your e-mail address.

To record your voting instructions on the Internet

1.  Read the proxy statement.
2.  Go to www.proxyweb.com/Putnam.
3.  Enter the 14-digit control number printed on your proxy card.
4.  Follow the instructions on the site.

If you submit your voting instructions on the Internet, do not return your proxy
card.

This is your PROXY CARD.

To vote by mail, please record your voting instructions on this proxy card, sign
it below, and return it promptly in the envelope provided. Your vote is
important.

    PLEASE FOLD AT PERFORATION BEFORE DETACHING

Proxy for a meeting of shareholders to be held on October 5, 2000 for Putnam
High Yield Municipal Trust (Common Shares).

This proxy is solicited on behalf of the Trustees of the fund.

The undersigned shareholder hereby appoints John A. Hill, Hans H. Estin, and
Robert E. Patterson, and each of them separately, Proxies, with power of
substitution, and hereby authorizes them to represent such shareholder and to
vote, as designated below, at the meeting of shareholders of Putnam High Yield
Municipal Trust on October 5, 2000, at 2:00 p.m., Boston time, and at any
adjournments thereof, all of the shares of the fund that the undersigned
shareholder would be entitled to vote if personally present.


                                      -1-
<PAGE>


                   PLEASE BE SURE TO SIGN AND DATE THIS PROXY.

Please sign your name exactly as it appears on this card. If you are a joint
owner, each owner should sign. When signing as executor, administrator,
attorney, trustee, or guardian, or as custodian for a minor, please give your
full title as such. If you are signing for a corporation, please sign the full
corporate name and indicate the signer's office. If you are a partner, sign in
the partnership name.

--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
Shareholder sign here                                Date

--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
Co-owner sign here                                   Date

HAS YOUR ADDRESS CHANGED?
Please use this form to notify us of any change in address or telephone number
or to provide us with your comments. Detach this form from the proxy card and
return it with your signed proxy in the enclosed envelope.

Name
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------

Street
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------

City                                   State                               Zip
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------

Telephone
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------

DO YOU HAVE ANY COMMENTS?

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

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


                                      -2-
<PAGE>


DEAR SHAREHOLDER:

Your vote is important. Please help us to eliminate the expense of follow-up
mailings by signing and returning this proxy card or by recording your voting
instructions via the Internet as soon as possible. A postage-paid envelope is
enclosed for your convenience.

THANK YOU!

PLEASE FOLD AT PERFORATION BEFORE DETACHING

   If you complete and sign the proxy, we'll vote exactly as you tell us. The
   Proxies are authorized to vote in their discretion upon any matters as may
     properly come before the meeting or at any adjournments of the meeting.
  If you simply sign the proxy, or fail to provide your voting instructions on
     a proposal, the Proxies will vote FOR fixing the number of Trustees as
         set forth in Proposal 1, FOR Proposal 2 and AGAINST Proposal 3.

       THE TRUSTEES RECOMMEND A VOTE FOR FIXING THE NUMBER OF TRUSTEES AND
                           ELECTING ALL THE NOMINEES:

Please vote by filling in the appropriate boxes below.

1.   Proposal to fix the number of Trustees and elect all nominees.
     The nominees for Trustees are: J.A. Baxter, H.H. Estin, J.A. Hill, R.J.
     Jackson, P.L. Joskow, E.T. Kennan, L.J. Lasser, J.H. Mullin, III, R.E.
     Patterson, G. Putnam, III, A.J.C. Smith, W.T. Stephens and W.N. Thorndike.

/ /  FOR fixing the number of Trustees as proposed and electing all the nominees
     (except as marked to the contrary below)

     To withhold authority to vote for one or more of the nominees, write the
     name(s) of the nominee(s) below:

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


/ /  WITHHOLD authority to vote for all nominees


                  THE TRUSTEES RECOMMEND A VOTE FOR PROPOSAL 2:

<TABLE>
<CAPTION>
                                                            FOR             AGAINST             ABSTAIN
<S>                                                         <C>             <C>                 <C>
</TABLE>


                                      -3-
<PAGE>

<TABLE>
<S>                                                         <C>             <C>                 <C>
2.           Proposal to ratify                             /  /            /  /                /  /
             the selection of
             PricewaterhouseCoopers LLP
             as the independent auditors of your fund.
</TABLE>

                THE TRUSTEES RECOMMEND A VOTE AGAINST PROPOSAL 3:

<TABLE>
<CAPTION>
                                                            FOR             AGAINST             ABSTAIN
<S>                                                         <C>             <C>                 <C>
3.           Proposal to convert                            /  /            /  /                /  /
             your fund from closed-end to
             open-end status and authorize
             certain related amendments to the
             Agreement and Declaration of Trust.
</TABLE>


Note:  If you have questions on any of the proposals, please call
1-800-225-1581.

                                      -4-

<PAGE>

PUTNAM INVESTMENTS                                                 (Logo)

                                             NOTE:  PHONE AND INTERNET VOTING IS
                                                 NOT AVAILABLE FOR THIS ACCOUNT.

                            This is your PROXY CARD.

To vote by mail, please record your voting instructions in this proxy card, sign
it below, and return it promptly in the envelope provided. Your vote is
important.

                   PLEASE FOLD AT PERFORATION BEFORE DETACHING

Proxy for a meeting of shareholders to be held on October 5, 2000 for Putnam
High Yield Municipal Trust (Preferred Shares).

This proxy is solicited on behalf of the Trustees of the fund.

The undersigned shareholder hereby appoints John A. Hill, Hans H. Estin, and
Robert E. Patterson, and each of them separately, Proxies, with power of
substitution, and hereby authorizes them to represent such shareholder and to
vote, as designated below, at the meeting of shareholders of Putnam High Yield
Municipal Trust on October 5, 2000, at 2:00 p.m., Boston time, and at any
adjournments thereof, all of the shares of the fund that the undersigned
shareholder would be entitled to vote if personally present.

                   PLEASE BE SURE TO SIGN AND DATE THIS PROXY.

Please sign your name exactly as it appears on this card. If you are a joint
owner, each owner should sign. When signing as executor, administrator,
attorney, trustee, or guardian, or as custodian for a minor, please give your
full title as such. If you are signing for a corporation, please sign the full
corporate name and indicate the signer's office. If you are a partner, sign in
the partnership name.

-------------------------------------------------
Shareholder sign here                                Date

-------------------------------------------------
Co-owner sign here                                   Date

If you complete and sign the proxy, we'll vote exactly as you tell us. The
Proxies are authorized to vote in their discretion upon any matters as may
properly come before the meeting or at any adjournments of the meeting. If you
simply sign the proxy, or fail to provide your voting instructions on a
proposal, the Proxies will vote FOR fixing the number of Trustees as set forth
in Proposal 1, FOR Proposal 2 and AGAINST Proposal 3.

                                      -1-
<PAGE>

THE TRUSTEES RECOMMEND A VOTE FOR FIXING THE NUMBER OF TRUSTEES AND ELECTING ALL
OF THE NOMINEES:

Please vote by filling in the appropriate boxes below.

1.   Proposal to fix the number of Trustees and elect all nominees. The nominees
     for Trustees are: J.A. Baxter, H.H. Estin, J.A. Hill, R.J. Jackson, P.L.
     Joskow, E.T. Kennan, L.J. Lasser, J.H. Mullin, III, R.E. Patterson, G.
     Putnam, III, A.J.C. Smith, W.T. Stephens and W.N. Thorndike.

/ /  FOR fixing the number of Trustees as proposed and electing all the
     nominees (except as marked to the contrary below)

     To withhold authority to vote for one or more of the nominees, write the
     name(s) of the nominee(s) below:

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

/ /  WITHHOLD authority to vote for all nominees

                  THE TRUSTEES RECOMMEND A VOTE FOR PROPOSAL 2:

                                               FOR       AGAINST     ABSTAIN
2.   Proposal to ratify the selection of       / /         / /         / /
     PricewaterhouseCoopers LLP as the
     independent auditors of your fund.

                THE TRUSTEES RECOMMEND A VOTE AGAINST PROPSAL 3:

                                               FOR       AGAINST     ABSTAIN

3.   Proposal to convert                       / /         / /         / /
     your fund from closed-end to
     open-end status and authorize
     certain related amendments to the
     Agreement and Declaration of Trust.

Note: If you have questions on any of the proposals, please call 1-800-225-1581.

                                      -2-



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