PAINEWEBBER SERIES TRUST
PRES14A, 1995-08-04
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<PAGE>
 
                             GOVERNMENT PORTFOLIO
                                      OF
                           PAINEWEBBER SERIES TRUST

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

                   NOTICE OF SPECIAL MEETING OF SHAREHOLDERS

                                     September 21, 1995


To the Shareholders:

     A special meeting of the holders of shares of beneficial interest
("Shares") of the Government Portfolio ("Portfolio") series of PaineWebber
Series Trust will be held on September 21, 1995, at 10:00 a.m., Eastern time, at
1285 Avenue of the Americas, 38th Floor, New York, New York 10019, for the
following purposes:

     1.  To consider a change in the Portfolio's investment objective from "high
         current income consistent with the preservation of capital and,
         secondarily, capital appreciation" to "total return consisting of
         capital appreciation and income";

     2.  To consider a Sub-Advisory Agreement between Mitchell Hutchins Asset
         Management Inc. and Pacific Investment Management Company, with respect
         to the assets of the Portfolio;

     3.  To consider an amendment to the Portfolio's fundamental investment
         limitation governing borrowings to increase permissible borrowings from
         10% to 33 1/3% of the Portfolio's assets and permit the use of dollar
         rolls; and

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

     Shareholders of record at the close of business on August 11, 1995 are
entitled to notice of, and to vote at, the meeting.  Your attention is called to
the accompanying Proxy Statement.  Regardless of whether you plan to attend the
meeting, PLEASE COMPLETE, DATE AND SIGN THE PROXY CARD AND RETURN IT IN THE
ENCLOSED PREPAID ENVELOPE so that a quorum will be present and a maximum number
of Shares may be voted.  If you attend the meeting, you may change your vote, if
desired, at that time.

                                By Order of the Board of Trustees,


                                Dianne E. O'Donnell
                                Secretary
        __, 1995
1285 Avenue of the Americas
New York, New York  10019
<PAGE>
 
                            YOUR VOTE IS IMPORTANT
                       NO MATTER HOW MANY SHARES YOU OWN

Please indicate your voting instructions on the enclosed proxy card, date and
sign the card, and return it in the envelope provided.  If you sign, date and
return the proxy card but give no voting instructions, your Shares will be voted
"FOR" each of the proposals noticed above.  In order to avoid the additional
expense of further solicitation, we ask your cooperation in mailing in your
proxy card promptly.  Unless proxy cards submitted by corporations and
partnerships are signed by the appropriate persons as indicated in the voting
instructions on the proxy card, they will not be voted.

                                     - 2 -
<PAGE>
 
                             GOVERNMENT PORTFOLIO
                                      OF
                           PAINEWEBBER SERIES TRUST
            1285 AVENUE OF THE AMERICAS, NEW YORK, NEW YORK  10019

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

                                PROXY STATEMENT
                                ---------------


                        SPECIAL MEETING OF SHAREHOLDERS
                       TO BE HELD ON SEPTEMBER 21, 1995
 
                                                                        __, 1995
 
     This Proxy Statement is furnished in connection with the solicitation of
proxies by the board of trustees ("Board") of PaineWebber Series Trust ("Trust")
for use at the special meeting of shareholders of the Government Portfolio
("Portfolio") to be held on September 21, 1995, or any adjournments thereof
("Meeting").  This Proxy Statement will first be mailed to shareholders on or
about August 18, 1995.

     The shares of beneficial interest ("Shares") of the Portfolio are currently
sold only to the separate accounts ("Separate Accounts") of PaineWebber Life
Insurance Company, American Republic Insurance Company and American Benefit Life
Insurance Company (collectively, the "Companies") to fund the benefits under
variable annuity contracts ("Contracts") issued by the Companies.  In accordance
with their view of applicable law, the Companies will solicit voting
instructions from the owners of Contracts relating to the Portfolio ("Contract
Owners") with respect to the matters set forth in this Proxy Statement.  In
connection with the solicitation of voting instructions, the Companies will
furnish a copy of this Proxy Statement to all Contract Owners.  The solicitation
of proxies will be made primarily by mail but also may include telephone or oral
communications by regular employees of the Companies, Mitchell Hutchins Asset
Management Inc. ("Mitchell Hutchins") or PaineWebber Incorporated
("PaineWebber"), none of whom will receive any compensation therefor from the
Portfolio.  The costs associated with such solicitation and the Meeting will be
borne by the Portfolio.

     Contract Owners at the close of business on August 11, 1995 (the "Record
Date") will be entitled to be present and give voting instructions for the
Portfolio at the Meeting, with respect to their Shares owned as of the Record
Date.  There were __________ Shares of the Portfolio outstanding and entitled to
vote as of the record date, representing total net assets of approximately
__________.  All Shares of the Portfolio held by the Separate Accounts will be
voted by the Companies in accordance with voting instructions received from
Contract Owners.  The Companies will vote Shares of the Portfolio for which no
instructions are received in the same proportion as Shares of the Portfolio for
which instructions have been received.

     To the knowledge of the Trust's management, as of the Record Date, [no
current trustee of the Trust owned any of the outstanding Shares of the
Portfolio or any other series of the Trust].  To the knowledge of the Trust's
management, as of the Record Date, the officers and trustees of the Trust owned,
as a group, less than 1% of the outstanding Shares of the Portfolio or any other
series of the Trust.

                                     - 3 -
<PAGE>
 
     On the Record Date, the Separate Accounts of PaineWebber Life Insurance
Company, American Republic Insurance Company and American Benefit Life Insurance
Company owned of record __%, __% and __%, respectively, of the outstanding
Shares of the Portfolio.  To the knowledge of the Trust's management, as of the
Record Date, [there are no persons owning beneficially more than 5% of the
outstanding Shares of the Portfolio].

     Mitchell Hutchins currently serves as the Portfolio's investment adviser
and administrator.  Mitchell Hutchins and PaineWebber are located at 1285 Avenue
of the Americas, New York, New York 10019.  The Trust has no principal
underwriter.

               PROPOSALS SUBMITTED FOR SHAREHOLDER CONSIDERATION

     None of the proposals presented herein will be implemented unless all of
the proposals are approved by shareholders.  If all proposals are approved, the
name of the Portfolio will be changed to Strategic Fixed Income Portfolio and
certain investment policy changes also will be implemented.  These investment
policy changes are identified and discussed below under "Operations of Portfolio
If All Proposals Are Approved."  The reasons Mitchell Hutchins believes the
proposed changes are in the best interests of the Portfolio and its shareholders
are discussed below under "Reasons for Proposed Changes."


                                  PROPOSAL 1

                       CONSIDERATION OF A CHANGE IN THE
                       PORTFOLIO'S INVESTMENT OBJECTIVE


     Currently, the Portfolio primarily seeks high current income consistent
with the preservation of capital and secondarily seeks capital appreciation.  In
attempting to achieve its objectives, the Portfolio invests primarily in high
quality U.S. government securities, which include U.S. Treasury obligations and
obligations issued or guaranteed by U.S. government agencies or
instrumentalities.  These latter obligations may be backed by the full faith and
credit of the U.S. government or supported primarily or solely by the
creditworthiness of the particular agency or instrumentality.  Under normal
market conditions, at least 65% of the Portfolio's total assets is invested in
U.S. government securities.  The Portfolio also may invest in certain zero
coupon securities that are U.S. Treasury notes and bonds that have been stripped
of their unmatured interest coupon receipts or interests in such U.S. Treasury
securities or coupons.

     At a meeting held on July 20, 1995, the Board considered and approved,
subject to shareholder approval, a recommendation by Mitchell Hutchins that the
Portfolio's investment objective be changed to "total return consisting of
capital appreciation and income.  If the new investment objective is approved by
shareholders, the Portfolio will invest in a diversified portfolio of fixed
income securities of varying maturities with a dollar-weighted average portfolio
duration between three and eight years.  Portfolio holdings will be concentrated
in areas of the bond market (based on quality, sector coupon and maturity) which
are believed to be  relatively undervalued.  This investment approach would
contrast with the current approach of high current income in that it is expected
to produce higher long-term returns, but would also be subject to a higher level
of risk, than is currently the case for the Portfolio.

                                     - 4 -
<PAGE>
 
REQUIRED VOTE
- -------------

     Change in the Portfolio's investment objective must be approved by a
"majority of the outstanding voting securities," as defined by the Investment
Company Act of 1940 ("1940 Act"), of the Portfolio entitled to vote at the
meeting.  As so defined, "majority of the outstanding voting securities" means
the lesser of (i) 67% or more of the shares of the Portfolio present at the
meeting, if at least 50% of the outstanding shares of the Portfolio entitled to
vote at the meeting are present or represented by proxy at the meeting, or (ii)
more than 50% of the outstanding shares of the Portfolio entitled to vote at the
meeting.  If the amendment of the fundamental investment limitation is not
approved by the shareholders of the Portfolio, the current fundamental
investment limitation for the Portfolio will remain in effect and none of the
other proposed changes will be implemented.

                   THE BOARD OF TRUSTEES RECOMMENDS THAT YOU
                             VOTE "FOR" PROPOSAL 1


                                  PROPOSAL 2

             CONSIDERATION OF THE PROPOSED SUB-ADVISORY AGREEMENT

BACKGROUND
- ----------

     Mitchell Hutchins serves as the administrator and investment adviser of the
Portfolio pursuant to a contract with the Trust dated April 21, 1988, as
supplemented by an Investment Advisory Fee Agreement dated May 1, 1989
("Advisory Agreement").  The Advisory Agreement was most recently approved by
shareholders of the Trust on April 19, 1990, and its continuance was most
recently approved by the Board of Trustees on June 2, 1995.  Under the Advisory
Agreement, Mitchell Hutchins receives a monthly fee at the annual rate of 0.50%
of the Portfolio's average daily net assets.  For the fiscal year ended December
31, 1994, the Portfolio paid fees under the Advisory Agreement to Mitchell
Hutchins of approximately $105,843.

     At a meeting held on July 20, 1995, the Board, including a majority of the
trustees who are not "interested persons" of the Trust, as defined in the 1940
Act ("Independent Trustees"), considered a recommendation by Mitchell Hutchins
that Pacific Investment Management Company ("PIMCO") be appointed as investment
sub-adviser for the Portfolio.  After considering Mitchell Hutchins'
recommendation and other information presented at that meeting, the Board
approved submission of the proposed sub-advisory agreement ("Sub-Advisory
Agreement") to the Portfolio's shareholders at the Meeting, and determined to
recommend that the Portfolio's shareholders approve the proposed Sub-Advisory
Agreement.

DESCRIPTION OF THE PROPOSED SUB-ADVISORY AGREEMENT
- ----------------------------------------------------

     The Sub-Advisory Agreement with respect to the Portfolio provides that
PIMCO, subject to the supervision of Mitchell Hutchins and the Board, shall
provide a continuous investment program and strategy with respect to the
investments of the Portfolio, including investment research and management, and
will make decisions with respect to and place orders for all purchases and sales
of portfolio securities.  Under the Sub-Advisory Agreement, Mitchell Hutchins
(not the Portfolio) will pay PIMCO a monthly fee for its investment advisory
services at an annual rate of 0.25% of the Portfolio's average daily net assets.
The Sub-Advisory Agreement provides that PIMCO will pay for all expenses
incurred by it in connection with its investment advisory services under the
Sub-Advisory Agreement.

                                     - 5 -
<PAGE>
 
     If approved by the Shareholders at the Meeting, the Sub-Advisory Agreement
will remain in effect for two years after its effective date and thereafter will
continue from year to year, provided that such continuance is approved annually
(i) by the vote of a majority of the Independent Trustees and (ii) by the Board
or the vote of the holders of a majority of the outstanding Shares of the
Portfolio.  The Sub-Advisory Agreement automatically terminates upon its
assignment and is terminable at any time without penalty, by the Board or by the
holders of a majority of the outstanding Shares of the Portfolio on 60 days'
written notice.  Either Mitchell Hutchins or PIMCO may terminate the Sub-
Advisory Agreement on 120 days' written notice without penalty.  Mitchell
Hutchins may also terminate the Sub-Advisory Agreement (i) upon material breach
by PIMCO of certain of its representations under the Sub-Advisory Agreement or
(ii) in the event that PIMCO is unable to discharge its duties under the Sub-
Advisory Agreement.

     The Sub-Advisory Agreement provides that PIMCO will not be liable for any
error of judgment or mistake of law or for any loss suffered by the Portfolio in
connection with the performance of the agreement, except a loss resulting from
willful misfeasance, bad faith, or gross negligence on the part of PIMCO in the
performance of its duties or from reckless disregard of its obligations and
duties under the Sub-Advisory Agreement.

     PIMCO makes various representations and warranties in the Sub-Advisory
Agreement, including (i) that it has adopted a written code of ethics which
complies with Rule 17j-1 under the 1940 Act and will certify its compliance with
such code of ethics to Mitchell Hutchins on an annual basis, and (ii) that it is
in compliance with various federal and state laws, including the Investment
Advisers Act of 1940 ("Advisers Act"), as amended.

     A copy of the proposed Sub-Advisory Agreement is attached to this Proxy
Statement as Exhibit A.

INFORMATION ABOUT PIMCO
- -----------------------

     Pacific Investment Management Company (PIMCO) is a subsidiary general
partnership of PIMCO Advisors L.P. (PIMCO Advisors).  A majority interest in
PIMCO Advisors is held by PIMCO Partners, G.P., a general partnership between
Pacific Financial Asset Management Corporation, an indirect wholly owned
subsidiary of Pacific Mutual Life Insurance Company (Pacific Mutual) and PIMCO
Partners, L.L.C., a limited liability company controlled by the PIMCO Managing
Directors.  PIMCOs address is 840 Newport Center Drive, Suite 360, Newport
Beach, California 92660.  PIMCO is registered as an investment adviser with the
Securities and Exchange Commission and as a commodity trading advisor with the
Commodity Futures Trading Commission.  As of May 31, 1995, PIMCO had
approximately $64.6 billion in assets under management and was adviser or sub-
adviser of 11 investment companies with 32 portfolios and aggregrate assets of
approximately $14.7 billion. The chief executive officers and general partners
of PIMCO are identified in the table below:


             CHIEF EXECUTIVE OFFICERS AND GENERAL PARTNERS OF PIMCO

      Name               Principal Occupation        Address
      ----               --------------------        -------

PIMCO Advisors L.P.      General Partner             840 Newport Center Drive
                                                     Newport Beach, CA 92660

                                     - 6 -
<PAGE>
 
      Name               Principal Occupation        Address
      ----               --------------------        -------

PIMCO Management, Inc.    General Partner          840 Newport Center Drive
                                                   Newport Beach, CA  92660

William S. Thompson       Managing Director,       840 Newport Center Drive
                          Chief Executive Officer  Newport Beach, CA  92660

David H. Edington         Managing Director        840 Newport Center Drive
                                                   Newport Beach, CA  92660

William H. Gross          Managing Director        840 Newport Center Drive
                                                   Newport Beach, CA  92660

John L. Hague             Managing Director        840 Newport Center Drive
                                                   Newport Beach, CA  92660

Brent R. Harris           Managing Director        840 Newport Center Drive
                                                   Newport Beach, CA  92660

Dean S. Meiling           Managing Director        840 Newport Center Drive
                                                   Newport Beach, CA  92660

James F. Muzzy            Managing Director        840 Newport Center Drive
                                                   Newport Beach, CA  92660

William F. Podlich III    Managing Director        840 Newport Center Drive
                                                   Newport Beach, CA  92660

William C. Powers         Managing Director        840 Newport Center Drive
                                                   Newport Beach, CA  92660

Frank B. Rabinovitch      Managing Director        840 Newport Center Drive
                                                   Newport Beach, CA  92660

                                     - 7 -
<PAGE>
 
The table below sets forth certain information with respect to other investment
portfolios that PIMCO serves as investment adviser or sub-adviser and that have
investment objectives similar to that of the Portfolio.

<TABLE>
<CAPTION>
                             Approximate                                        
                          Net Assets as of  Annual Rate of Investment          
Name of Portfolio          June 30, 1995    Fee as a Percentage of Net Assets  
- -----------------         ----------------                         ----------  
<S>                       <C>               <C>
PIMCO FUNDS               
- -----------------------------------------------------------------------------
  Total Return Fund         $8,298,923,935  Annual rate of 0.30% of average
                                            daily net assets up to $150
                                            million, 0.25% of average daily
                                            net assets over $150 million

  International Fund         1,990,978,663  Annual rate of 0.30% of average
                                            daily net assets up to $150
                                            million, 0.25% of average daily
                                            net assets over $150 million

  Low Duration Fund          2,505,180,346  Annual rate of 0.30% of average
                                            daily net assets up to $150
                                            million, 0.25% of average daily
                                            net assets over $150 million

  Foreign Fund                 231,462,230  Annual rate of 0.30% of average
                                            daily net assets up to $150
                                            million, 0.25% of average daily
                                            net assets over $150 million

  High Yield Fund              398,237,661  Annual rate of 0.30% of average
                                            daily net assets up to $150
                                            million, 0.25% of average daily
                                            net assets over $150 million

  Low Duration Fund II         191,589,706  Annual rate of 0.30% of average
                                            daily net assets up to $150
                                            million, 0.25% of average daily
                                            net assets over $150 million

  Total Return Fund            110,977,931  Annual rate of 0.30% of average
                                            daily net assets up to $150
                                            million, 0.25% of average daily
                                            net assets over $150 million
</TABLE>

                                     - 8 -
<PAGE>
 
<TABLE>
<CAPTION>
                            Approximate  
                          Net Assets as of  Annual Rate of Investment Advisory 
Name of Portfolio          June 30, 1995    Fee as a Percentage of Net Assets 
- -----------------         ----------------                         ----------
<S>                       <C>               <C>
 
  Short-Term Fund               79,343,229  Annual rate of 0.30% of average
                                            daily net assets up to $150
                                            million, 0.25% of average daily
                                            net assets over $150 million

  Growth Stock Fund             15,630,053  Annual rate of 0.30% of average
                                            daily net assets up to $150
                                            million, 0.25% of average daily
                                            net assets over $150 million

  Long-Term US Government       34,197,224  Annual rate of 0.30% of average
   Fund                                     daily net assets up to $150
                                            million, 0.25% of average daily
                                            net assets over $150 million

  Global Fund                   86,204,508  Annual rate of 0.30% of average
                                            daily net assets up to $150
                                            million, 0.25% of average daily
                                            net assets over $150 million

  StocksPLUS Fund               67,797,761  Annual rate of 0.45% of average
                                            daily net assets up to $150
                                            million, 0.40% of average daily
                                            net assets over $150 million

  VersaSTYLE Fund                5,569,292  Annual rate of 0.30% of average
                                            daily net assets up to $150
                                            million, 0.25% of average daily
                                            net assets over $150 million

FRANK RUSSELL INVESTMENT   
 MANAGEMENT COMPANY        

  Fixed Income I Fund           85,118,005  Annual rate of 0.25% of net
                                            assets based on the average of
                                            ending monthly market values
                                            over 3 months, paid in arrears

  Diversified Bond Fund         73,566,139  Annual rate of 0.25% of net
                                            assets based on the average of
                                            ending monthly market values
                                            over 3 months, paid in arrears

  Fixed Income III Fund         71,449,314  Annual rate of 0.25% of net
                                            assets based on the average of
                                            ending monthly market values
                                            over 3 months, paid in arrears
</TABLE>

                                     - 9 -
<PAGE>
 
<TABLE>
<CAPTION>
                            Approximate   
                         Net Assets as of   Annual Rate of Investment Advisory 
Name of Portfolio          June 30, 1995    Fee as a Percentage of Net Assets 
- -----------------        ----------------                          ----------
<S>                      <C>                <C>
  Multistrategy Bond         $ 70,599,801   Annual rate of 0.25% of net
  Fund                                      assets based on the average of
                                            ending monthly market values
                                            over 3 months, paid in arrears

THE HARBOR GROUP

  Harbor Bond Fund            204,596,212   Annual rate of 0.50% of average
                                            daily net assets on first $25
                                            million; 0.375% on average daily
                                            net assets on next $25 million;
                                            0.25% of average daily net
                                            assets over $50 million

PACIFIC SELECT SERIES TRUST 

  Managed Bond Series          86,390,228   Annual rate of 0.50% of average
                                            daily net assets

  Government Securities        37,482,877   Annual rate of 0.50% of average
   Series                                   daily net assets

PIMCO ADVISORS              

  Managed Bond & Income       438,357,624   Annual rate of 0.25% of average
   Portfolio                                daily net assets

  Balanced Portfolio           36,480,235   Annual rate of 0.25% of average
                                            daily net assets

PRUDENTIAL SECURITIES       
 TARGET PORTFOLIO TRUST     

  Intermediate Term Bond       69,583,517   Annual rate of 0.25% of average
   Portfolio                                daily net assets

  Total Return Bond            36,847,515   Annual rate of 0.25% of average
   Portfolio                                daily net assets

PIMCO COMMERCIAL MORTGAGE   
 SECURITIES TRUST, INC.     

  PIMCO Commercial            149,913,692   Annual rate of 0.725% of average
   Mortgage Trust                           weekly net assets paid quarterly
</TABLE>

                                     - 10 -
<PAGE>
 
<TABLE>
<CAPTION>
                            Approximate   
                         Net Assets as of   Annual Rate of Investment Advisory 
Name of Portfolio           May 31, 1995    Fee as a Percentage of Net Assets 
- -----------------        ----------------                          ----------
<S>                      <C>                <C>
AMERICAN SKANDIA TRUST

  Total Return Bond          $ 91,654,576   Annual rate of 0.30% of average
   Portfolio                                daily net assets on first $150
                                            million; 0.25% of average daily
                                            net assets over $150 million
                                            paid monthly

FREMONT MUTUAL FUNDS

  Total Return Fund            70,823,814   Annual rate of 0.25% of average
                                            daily net assets

PAINEWEBBER  MANAGED
 INVESTMENTS TRUST

  Short-Term U.S.             351,545,106   Annual rate of 0.25% of average
   Government Income Fund                   daily net assets

PIMCO ADVISORS FUNDS

  High Income Fund            159,413,126   Annual rate of 0.25% of average
                                            daily net assets

  Short-Intermediate Fund      73,057,332   Annual rate of 0.25% of average
                                            daily net assets

  U.S. Government Fund        314,154,166   Annual rate of 0.25% of average
                                            daily net assets

  Total Return Income Fund     62,346,944   Annual rate of 0.25% of average
                                            daily net assets

</TABLE>

TRUSTEES' CONSIDERATIONS AND RECOMMENDATIONS
- --------------------------------------------

     At the meeting held on July 20, 1995, the Board, including the Independent
Trustees, after a full evaluation of the matters described above and with the
advice and assistance of counsel to the Independent Trustees, approved the
proposed Sub-Advisory Agreement.  During their deliberations, the Trustees also
reviewed information provided by Mitchell Hutchins and PIMCO relating to the
structure and organization of PIMCO.  The Board considered the quality of the
investment sub-advisory services that had been provided by PIMCO to other funds,
and also considered the Portfolio's performance in relation to a selected group
of other funds with similar investment objectives.  The Board noted, in
particular, that the advisory fee paid by the Portfolio would remain the same as
before, and determined that the terms of the Sub-Advisory Agreement and the sub-
advisory fee were fair.

                                     - 11 -
<PAGE>
 
     The Board also considered the fact that consistent with the interests of
the Portfolio and subject to the review of the Board, the Sub-Adviser may cause
the Portfolio to purchase and sell portfolio securities through brokers who
provide the Sub-Adviser with research, analysis, advice and similar services.
In return for such services, the Portfolio may pay to those brokers a higher
commission than may be charged by other brokers, provided that the Sub-Adviser
determines in good faith that such commission is reasonable in terms either of
that particular transaction or of the overall responsibility of PIMCO to the
Portfolio and its other clients and that the total commissions paid by the
Portfolio will be reasonable in relation to the benefits to the Portfolio over
the long term.  PIMCO will not enter into any soft dollar arrangements relating
to principal transactions by the Portfolio or receive in such principal
transactions the types of services which could be purchased for hard dollars.
Research services furnished by brokers through which the Portfolio effects
securities transactions may be used by PIMCO in advising other funds or accounts
it advises and, conversely, research services furnished to PIMCO in connection
with other funds or accounts it advises may be used by PIMCO in advising the
Portfolio.  Information and research received from brokers will be in addition
to, and not in lieu of, the services required to be performed by PIMCO under the
Sub-Advisory Agreement.


REQUIRED VOTE
- -------------

     At the Meeting, shareholders of the Portfolio will vote on the proposed
Sub-Advisory Agreement, in accordance with voting instructions received from the
Contract Owners.  The Board of Trustees recommends that the shareholders approve
the Sub-Advisory Agreement.  The affirmative vote of the holders of a majority
of the outstanding Shares of the Portfolio is required to approve the Sub-
Advisory Agreement.  "Majority" for this purpose under the 1940 Act means the
lesser of:  (i) 67% of the Shares of the Portfolio represented at the Meeting if
the holders of more than 50% of the outstanding Shares are represented, or (ii)
more than 50% of the outstanding Shares of the Portfolio.

     If the Sub-Advisory Agreement is not approved, Mitchell Hutchins will
continue to provide portfolio management services to the Portfolio, the Board of
Trustees will consider whether it should take any other action appropriate to
obtain an investment sub-adviser for the Portfolio and none of the other
proposed changes will be implemented.



         THE BOARD OF TRUSTEES RECOMMENDS THAT THE SHAREHOLDERS OF THE
                PORTFOLIO VOTE "FOR" THE SUB-ADVISORY AGREEMENT



                                  PROPOSAL 3

         CONSIDERATION OF AN AMENDMENT TO THE PORTFOLIO'S FUNDAMENTAL
      INVESTMENT LIMITATION TO INCREASE PERMISSIBLE BORROWINGS AND PERMIT
                            THE USE OF DOLLAR ROLLS


     At their July 20, 1995 meeting, the Trust's board of trustees approved,
subject to shareholder approval, an amendment to the Portfolio's fundamental
investment limitations that permits the 

                                     - 12 -
<PAGE>
 
Portfolio to use leverage in the form of dollar rolls and that increases the
amount of the Portfolio's assets that may be committed to borrowing. Currently,
the Portfolio's fundamental investment limitation concerning the use of leverage
provides as follows:

                 [The] Portfolio may not:

                 ...issue senior securities or borrow money, except from banks
                 for temporary purposes and except for reverse repurchase
                 agreements provided that the aggregate amount of all such
                 borrowing does not exceed 10% of the total asset value of the
                 Portfolio at the time of such borrowing; provided further that
                 the Portfolio will not purchase securities while borrowings
                 (including reverse repurchase agreements) in excess of 5% of
                 the total asset value of the Portfolio are outstanding.

     The proposed amendment of the Portfolio's fundamental investment limitation
concerning the use of leverage is set forth below.  Text that is added or
changed is underlined.

                 [The] Portfolio may not:

                 ...issue senior securities or borrow money, except from banks
                 or through reverse repurchase agreements and dollar rolls, and
                                                          ---------------------
                 then in an aggregate amount not in excess of 33 1/3% of the
                                                              -------
                 Portfolio's total assets (including the amount of the
                 borrowings and senior securities issued but reduced by any
                 liabilities not constituting senior securities) at the time of
                 such borrowings; except that the Portfolio may borrow up to an
                 additional 5% of its total assets (not including the amount
                 borrowed) for temporary or emergency purposes.

     In a dollar roll, the Portfolio would sell mortgage-backed or other
securities for delivery in the current month and simultaneously contract to
repurchase substantially similar securities on a specified future date.  In the
case of dollar rolls involving mortgage-backed securities, the mortgage-backed
securities that are repurchased would be of the same type, and would have the
same interest rate and maturity, as those sold but generally would be supported
by different pools of mortgages with substantially similar prepayment
characteristics.  The Portfolio would forgo principal and interest paid during
the roll period on the securities sold in a dollar roll, but the Portfolio would
be compensated by the difference between the current sales price and the lower
price for the future purchase as well as by any interest earned on the proceeds
of the securities sold.  The Portfolio also could be compensated through the
receipt of fee income equivalent to a lower forward price.

     The dollar rolls are reverse purchase agreements entered into by the
Portfolio would be considered to be borrowings and would be subject to the
Portfolios limitation on borrowings as described above.  However, the dollar
rolls and reverse repurchase agreements entered into by the Portfolio normally
would be arbitrage transactions in which the Portfolio wold maintain an
offsetting position in securities or repurchase agreements that mature on or
before the settlement date on the related dollar roll or reverse repurchase
agreement.  Because the Portfolio would receive interest  on the securities or
repurchase agreements in which it invests the transaction proceeds, such
transactions may involve leverage.  However, because these securities or
repurchase agreements will mature on or before the settlement date of the
related dollar roll or reverse repurchase 

                                     - 13 -
<PAGE>
 
agreement, Mitchell Hutchins and PIMCO believe that these arbitrage transactions
do not present the risks to the Portfolio that are associated with other types
of leverage. The Portfolio will not enter into dollar rolls or reverse
repurchase agreements, other than in arbitrage transactions as described above,
in an aggregate amount in excess of 5% of the Portfolios total assets.

     The proposed amendment would permit PIMCO, the proposed sub-adviser, more
investment flexibility in managing the Portfolio's portfolio.  As a result, to
the extent consistent with the Portfolio's investment objective, PIMCO could
pursue investment opportunities that it otherwise might be forced to forgo
because of the Portfolio's current fundamental investment limitation.

REQUIRED VOTE
- -------------

     The amendment of the Portfolio's fundamental investment limitation must be
approved by a "majority of the outstanding voting securities," as defined by the
1940 Act, of the Portfolio entitled to vote at the meeting.  As so defined,
"majority of the outstanding voting securities" means the lesser of (i) 67% or
more of the shares of the Portfolio present at the meeting, if at least 50% of
the outstanding shares of the Portfolio entitled to vote at the meeting are
present or represented by proxy at the meeting, or (ii) more than 50% of the
outstanding shares of the Portfolio entitled to vote at the meeting.  If the
amendment of the fundamental investment limitation is not approved by the
shareholders of the Portfolio, the current fundamental investment limitation for
the Portfolio will remain in effect and none of the other proposed changes will
be implemented.

                   THE BOARD OF TRUSTEES RECOMMENDS THAT YOU
                             VOTE "FOR" PROPOSAL 3



                         REASONS FOR PROPOSED CHANGES

     In determining to submit the three proposals set forth above for
shareholder approval, and in approving the investment policy changes described
below for the Portfolio, the Board considered Mitchell Hutchins' recommendation
to implement the proposed changes and its belief that the changes will make the
Portfolio more attractive to its existing shareholders and also to potential
investors.  Mitchell Hutchins advised the Board that it believed that the
Portfolio, as currently structured, was no longer attractive to the owners of
the variable annuity contracts, who are its exclusive investors.  The Portfolio,
which commenced operations on July 5, 1989, has been losing assets since the
fiscal year ended 1992.  At that time, the Portfolio had approximately $24
million in assets.  By the close of the fiscal year ended December 31, 1994, its
assets had dropped to approximately $17 million.  As a result of the decrease in
assets, the Portfolio also has experienced an increase in its expense ratios.
For the fiscal year ended December 31, 1992, its ratio of expenses to average
net assets was 0.76%.  That ratio increased to 0.79% for the fiscal year ended
December 31, 1993 and to 0.89% for the fiscal year ended December 31, 1994.
Mitchell Hutchins believes that the decline in Portfolio assets and concomitant
increase in Portfolio expenses will continue if the Portfolio continues its
current operations.  In Mitchell Hutchins' opinion, however, the fact that the
Portfolio is conservatively managed and offers relatively low returns is
fundamental to its lack of attractiveness to investors.  Because variable
annuities are inherently long term investment vehicles, Mitchell Hutchins
believes that the more appropriate investment vehicles are those that are more
aggressively managed and seek higher returns with the resulting higher risk
levels.  Accordingly, Mitchell Hutchins believes that realigning the Portfolio
as described in this Proxy Statement would provide the opportunity for the
variable annuity owner to obtain higher long-term 

                                     - 14 -
<PAGE>
 
returns and that the resulting increase in the risk level of the Portfolio is
justifiable. If Mitchell Hutchins is correct in its views, the realigned
Portfolio should attract additional assets and its expense ratios would decline
accordingly.

                            OPERATIONS OF PORTFOLIO
                         IF ALL PROPOSALS ARE APPROVED

     If all the proposals described above are approved by the Portfolio's
shareholders, the name of the Portfolio will be changed from "Government
Portfolio" to "Strategic Fixed Income Portfolio" and a number of its investment
policies also will be changed.  The investment policy changes that constitute a
significant change in the Portfolio's operations or risks are described below.

     CHANGES IN TYPES OF PORTFOLIO SECURITIES.  If the proposed changes are
made, the Portfolio will invest in a portfolio of fixed income securities of
varying maturities with a dollar-weighted average portfolio duration between
three and eight years.  Portfolio holdings will be concentrated in the areas of
the bond market (based on quality, sector, coupon or maturity) that PIMCO, as
sub-adviser, believes to be relatively undervalued.  The Portfolio at present
has no specific average portfolio maturity or duration requirement and is
required, under normal circumstances, to invest at least 65% of its total assets
in U.S. government securities, such as obligations of the U.S. Treasury and
obligations issued or guaranteed by U.S. government agencies or
instrumentalities.  if the proposed changes are made, the Portfolio will
continue to be authorized to invest in U.S. government securities, but will be
subject to no specific percentage requirements.

     The Portfolio at present may invest up to 35% of its total assets in
obligations of foreign governments and their subdivisions, agencies or
instrumentalities and obligations of supranational organizations such as the
International Bank for Reconstruction and Development ("World Bank"), all of
which may be denominated in foreign currencies.  If the proposed changes are
made, the Portfolio will continue to be authorized to invest in these types of
securities, but may not invest more than 10% of its assets in securities
denominated in foreign currencies.  The Portfolio also would be permitted to
invest an additional 10% of its assets in Yankee bonds and Eurodollar bonds,
combined.

     Additional securities in which the Portfolio will be authorized to invest
if the investment policy changes are implemented include corporate and other
debt obligations, convertible securities, non-government mortgage-backed
securities, asset-backed securities,  commercial paper, certificates of deposit,
money market instruments, foreign currency exchange-related securities and loan
participations.  The types of securities in which the Portfolio is not currently
authorized to invest are described below.

     The Portfolio currently is not authorized to invest in corporate and other
debt obligations that are not U.S. government obligations or those of foreign
governments and their subdivisions.  If the proposed changes are implemented,
the Portfolio will be authorized to invest in corporate and other debt
obligations with no percentage limitation.  The quality requirements for these
investments are discussed below under "Change in Portfolio Quality
Requirements."

     The Portfolio currently is not authorized to invest in convertible
securities.  If the proposed changes are implemented, the Portfolio will be
authorized to invest in these securities with no percentage limitation.  A
convertible security is a bond, debenture, note, preferred stock or other
security that may be converted into or exchanged for a prescribed amount of
common stock of the same or a different issuer within a particular period of
time at a specified price or formula.  A 

                                     - 15 -
<PAGE>
 
convertible security entitles the holder to receive interest paid or accrued on
debt or dividends paid on preferred stock until the convertible security matures
or is redeemed, converted or exchanged. Convertible securities have unique
investment characteristics in that they generally (1) have higher yields than
common stocks but lower yields than comparable non-convertible securities, (2)
are less subject to fluctuation than the underlying stock because they have
fixed income characteristics, and (3) provide the potential for capital
appreciation if the market price of the underlying common stock increases. While
no securities investment is without some risk, investments in convertible
securities generally entail less risk than the issuer's common stock, although
the extent to which such risk is reduced depends in large measure upon the
degree to which the convertible security sells above its value as a fixed income
security.

     The Portfolio presently may invest in mortgage-backed securities of U.S.
government issuers.  If the proposed changes are implemented, the Portfolio also
will be able to invest in mortgage-backed securities of non-U.S. government
issuers.  Non-government mortgage-backed securities are issued by private
issuers, generally originators of and investors in mortgage loans, including
savings associations, mortgage bankers, commercial banks, investment bankers and
special purpose entities (collectively, "Private Mortgage Lenders").  Payments
of principal and interest (but not the market value) of such private mortgage-
backed securities may be supported by pools of mortgage loans or other mortgage-
backed securities that are guaranteed, directly or indirectly, by the U.S.
government or one of its agencies or instrumentalities, or they may be issued
without any government guarantee of the underlying mortgage assets but with some
form of non-governmental credit enhancement.  The yield characteristics and
risks of non-government mortgage-backed securities are otherwise similar to
those of the U.S. government mortgage-backed securities in which the Portfolio
currently may invest.

     The Portfolio will be able to invest in asset-backed securities if the
proposed changes are implemented.  Asset-backed securities have structural
characteristics similar to those of mortgage-backed securities; however, the
underlying assets are not first-lien mortgages or interests therein, but include
assets such as motor vehicle installment sales contracts, other installment
sales contracts, home equity loans, leases of various types of real and personal
property and receivables from revolving credit (credit card) agreements.  These
assets are securitized through the use of trusts or special purpose
corporations.  Payments or distributions of principal and interest on asset-
backed securities may be guaranteed up to certain amounts and for a certain time
period by a letter of credit or pool insurance policy issued by a financial
institution unaffiliated with the issuer or other credit enhancements may be
present.

     The Portfolio is not currently authorized to invest in loan participations.
If the proposed changes are implemented, the Portfolio may invest in secured or
unsecured fixed or floating rate loans ("Loans") arranged through private
negotiations between a borrowing corporation and one or more financial
institutions ("Lenders").  The Portfolio's investments in Loans are expected in
most instances to be in the form of participations ("Participations") and
assignments ("Assignments") of all or a portion of Loans from third parties.
Participations typically will result in the Portfolio's having a contractual
relationship only with the Lender, not with the borrower.  The Portfolio will
have the right to receive payments of principal, interest and any fees to which
it is entitled only from the lender selling the Participation and only upon
receipt by the Lender of the payments from the borrower.  In connection with
purchasing Participations, the Portfolio generally has no direct right to
enforce compliance by the borrower with the terms of the loan agreement relating
to the Loan, nor any rights of set-off against the borrower, and the Portfolio
may not benefit directly from any collateral supporting the Loan in which it has
purchased the Participation.  As a result, the Portfolio will assume the credit
risk of both the borrower and the Lender that is selling the Participation.  In
the 

                                     - 16 -
<PAGE>
 
event of the insolvency of the Lender selling a Participation, the Portfolio
may be treated as a general creditor of the Lender and may not benefit from any
set-off between the Lender and the borrower.  The Portfolio will acquire
Participations only if the lender interpositioned between the Portfolio and the
borrower is determined by PIMCO to be creditworthy.

     When the Portfolio purchases Assignments from Lenders, it acquires direct
rights against the borrower on the Loan.  However, since Assignments are
arranged through private negotiations between potential assignees and assignors,
the rights and obligations acquired by the Portfolio as the purchaser of an
Assignment may differ from, and be more limited than, those held by the
assigning Lender.

     Assignments and Participations are generally not registered under the
Securities Act of 1933 and thus are subject to the Portfolio's limitation on
investment in illiquid securities.  Because there is no liquid market for these
securities, the Portfolio anticipates that these securities could be sold only
to a limited number of institutional investors.  The lack of a liquid secondary
market will have an adverse impact on the value of these securities and on the
Portfolio's ability to dispose of particular Assignments and Participations when
necessary to meet the Portfolio's liquidity needs or in response to a specific
economic event, such as a deterioration in the creditworthiness of the borrower.

     CHANGE IN PORTFOLIO QUALITY REQUIREMENTS.  If the proposed changes are
implemented, all securities purchased for the Portfolio will be investment
grade, except that up to 20% of the portfolio's assets may be rated below
investment grade.  In contrast, the Portfolio at present may invest only in
"high quality" debt securities and thus may not purchase any securities that are
rated below investment grade. Investment grade securities are those rated in the
four highest grades assigned by Standard & Poor's Ratings Group ("S&P") (BBB or
higher) or Moody's Investors Service ("Moody's")(Baa or higher) or comparably
rated by another nationally recognized statistical rating organization
("NRSRO").  "High quality" debt securities are generally considered to be those
that are rated in one of the two highest grades assigned by S&P or Moody's or
comparably rated by another NRSRO.  Unrated securities may be acquired by the
Portfolio if Mitchell Hutchins (PIMCO if the proposed changes are implemented)
determines the securities to be of comparable quality to rated securities that
the Portfolio is permitted to purchase.  Moody's considers debt securities rated
Baa to have speculative characteristics.  For debt securities rated in the
lowest investment grade category, changes in economic conditions or other
circumstances are more likely to lead to a weakened capacity to make principal
and interest payments than is the case for higher grade debt securities.

     If the proposed changes are implemented, the Portfolio will be able to
invest up to 20% of its assets in below investment grade securities, commonly
referred to as "junk bonds."   These securities are deemed by the rating
organizations to be predominantly speculative with respect to the issuer's
capacity to pay interest and repay principal and may involve major risk
exposures to adverse conditions.  The securities purchased by the Portfolio may
not be rated below B by S&P or Moody's, assigned a comparable rating by another
NRSRO or, if unrated, determined by PIMCO to be of comparable quality.  Below
investment grade debt securities generally offer a higher current yield than
that available from higher grade issues, but they involve higher risks in that
they are especially subject to adverse changes in general economic conditions
and in the industries in which the issuers are engaged, to changes in the
financial condition of the issuers and to price fluctuation in response to
changes in interest rates.  During periods of economic downturn or rising
interest rates, highly leveraged issuers may experience financial stress which
could adversely affect their ability to make payments of principal and interest
and increase the possibility of default.  In addition, such issuers may not have
more traditional methods of financing available to them, and may be unable to
repay 

                                     - 17 -
<PAGE>
 
debt at maturity by refinancing.  The risk of loss due to default by such
issuers is significantly greater because such securities frequently are
unsecured and subordinated to the prior payment of senior indebtedness.

     The market for lower rated securities has expanded rapidly in recent years,
and its growth paralleled a long economic expansion.  In the past, the prices of
many lower rated debt securities declined substantially, reflecting an
expectation that many issuers of such securities might experience financial
difficulties.  As a result, the yields on lower rated debt securities rose
dramatically, but these high yields did not reflect the value of the income
stream that holders of the securities expected, but rather the risk that holders
of the securities could lose a substantial portion of their value as a result of
the issuers' financial restructuring or default.  There can be no assurance that
such declines will not recur.  The market for lower rated debt securities
generally is thinner and less active than that for higher quality securities,
which may limit the Portfolio's ability to sell such securities at fair value in
response to changes in the economy or the financial markets.  Adverse publicity
and investor perceptions, whether or not based on fundamental analysis, may also
decrease the values and liquidity of lower rated securities, especially in a
thinly traded market.

     USE OF DOLLAR-WEIGHTED PORTFOLIO DURATION.  If the proposed changes are
implemented, the Portfolio's total investments will have a dollar-weighted
average portfolio duration between three and eight years.  Duration is a measure
of the expected life of a fixed income security and was developed as a more
precise alternative to the concept of "term to maturity."  Duration incorporates
a bond's yield, coupon interest payment, final maturity and call features into
one measure.  Duration is one of the fundamental tools that PIMCO expects to use
in portfolio selection.

     Traditionally, a debt security's "term to maturity" has been used as a
proxy for the sensitivity of the security's price to changes in interest rates
(which is the "interest rate risk" or "volatility" of the security).  However,
"term to maturity" measures only the time until a debt security provides its
final payments, taking no account of the pattern of the security's payments
prior to maturity.  Duration is a measure of the expected life of a fixed income
security on a present value basis.  Duration takes the length of the time
intervals between the present time and the time that the interest and principal
payments are scheduled or, in the case of a callable bond, expected to be
received, and weights them by the present values of the cash to be received at
each future point in time.  For any fixed income security with interest payments
occurring prior to the payment of principal, duration is always less than
maturity.  In general, all other things being equal, the lower the stated or
coupon rate of interest of a fixed income security, the longer the duration of
the security; conversely, the higher the stated or coupon rate of interest of a
fixed income security, the shorter the duration of the security.

     Futures contracts, options and options on futures contracts have durations
that, in general, are closely related to the duration of the securities that
underlie these instruments.  Holding long futures or call option positions
(backed by a segregated account of cash and cash equivalents) will lengthen the
Portfolio's duration by approximately the same amount that buying an equivalent
amount of the underlying securities would.  Short futures or put option
positions have durations roughly equal to the negative duration of the
securities that underlie these positions and have the effect of reducing
portfolio duration by approximately the same amount that selling an equivalent
amount of the underlying securities would.

     There are some situations where even the standard duration calculation does
not properly reflect the interest rate exposure of a security.  For example,
floating and variable rate securities often have final maturities of ten or more
years; however, their interest rate exposure corresponds to the frequency of the
coupon reset.  Another example where the interest rate exposure is not properly

                                     - 18 -
<PAGE>
 
captured by duration is the case of mortgage pass-through securities.  The
stated final maturity of such securities is generally 30 years, but current
prepayment rates are more critical in determining the securities' interest rate
exposure.  In these and other similar situations, PIMCO will use more
sophisticated analytical techniques that incorporate the economic life of a
security into the determination of its interest rate exposure.

     INCREASE IN ILLIQUID SECURITY LIMITATION.   At present, the Portfolio may
invest up to 10% of its net assets in illiquid securities.  If the proposed
changes are implemented, this limitation would be increased to 15% of the
Portfolio's net assets, and the risks associated with illiquid securities would
be increased for the Portfolio.

     Illiquid securities are securities that cannot be disposed of within seven
days in the ordinary course of business at approximately the amount at which the
Portfolio has valued them and includes purchased over the counter ("OTC")
options, certain cover for OTC options, repurchase agreements with maturities in
excess of seven days and securities whose disposition is restricted under the
federal securities laws (other than "Rule 144A" securities that Mitchell
Hutchins determines to be liquid under procedures approved by the Trust's board
of trustees).  Illiquid restricted securities may be sold only in privately
negotiated transactions or in public offerings with respect to which a
registration statement is in effect under the Securities Act of 1933 ("1933
Act").  Where registration is required, the Portfolio may be obligated to pay
all or part of the registration expenses and a considerable period may elapse
between the time of the decision to sell and the time the Portfolio may be
permitted to sell a security under an effective registration statement.  If,
during such a period, adverse market conditions were to develop, the Portfolio
might obtain a less favorable price than that which prevailed when it decided to
sell.  Rule 144A establishes a "sale harbor" from the registration requirements
of the 1933 Act.  Institutional markets for restricted securities have developed
as a result of Rule 144A, providing both readily ascertainable values for
restricted securities and the ability to liquidate an investment to satisfy
share redemption orders.  An insufficient number of qualified institutional
buyers interested in purchasing Rule 144A-eligible securities held by the
Portfolio, however, could affect adversely the marketability of such portfolio
securities and the Portfolio might be unable to dispose of the securities
promptly or at favorable prices.

     INVESTMENT IN PAYMENT-IN-KIND SECURITIES.  If the proposed changes are
implemented, the Portfolio would be authorized to invest in payment-in-kind
("PIK") securities, which pay interest in the form of additional securities
rather than cash.  As is true with respect to the zero coupon bonds in which the
Portfolio currently is authorized to invest and for which a portion of the
original issue discount must be accrued each year as income, this non-cash
income must be included in the annual income of the Portfolio and an amount
equal to the non-cash income must be distributed to the Portfolio's shareholders
at least annually to permit the portfolio to continue to qualify for pass-
through federal income tax treatment as a regulated investment company.  This
amount must be paid from the cash assets of the Portfolio or by liquidation of
portfolio securities, if necessary, at a time when the Portfolio may not
otherwise have done so.  PIK securities usually trade at a substantial discount
from their face or par value and will be subject to greater fluctuation of
market value in response to changing interest rates than debt obligations of
comparable maturities that make current distributions of interest in cash.

                                     - 19 -
<PAGE>
 
                                   GENERAL INFORMATION

Brokerage Commissions
- ---------------------

     PaineWebber is the only affiliated broker of the Portfolio.  For the fiscal
year ended December 31, 1994, the Portfolio paid no brokerage commissions to
PaineWebber.

Other Matters to Come Before the Meeting
- ----------------------------------------

     The Trust's management does not know of any matters to be presented at the
Meeting other than those described in this Proxy Statement.  If other business
should properly come before the Meeting, the proxyholders will vote thereon in
accordance with their best judgment.

Shareholder Proposals
- ---------------------

     As a general matter, the Trust does not hold regular annual or other
meetings of shareholders.  Any shareholder who wishes to submit proposals to be
considered at a special meeting of the Trust's shareholders should send such
proposals, certified mail-return receipt requested, to the Trust at 1285 Avenue
of the Americas, New York, New York 10019, so as to be received a reasonable
time before the proxy solicitation for that meeting is made.  Shareholder
proposals that are submitted in a timely manner will not necessarily be included
in the Trust's proxy materials.  Inclusion of such proposals is subject to
limitations under the federal securities laws.

REPORTS TO SHAREHOLDERS
- -----------------------

     THE TRUST WILL FURNISH TO SHAREHOLDERS OF THE PORTFOLIO AND TO CONTRACT
OWNERS, WITHOUT CHARGE, A COPY OF THE MOST RECENT ANNUAL REPORT, AND THE MOST
RECENT SEMI-ANNUAL REPORT SUCCEEDING SUCH ANNUAL REPORT, IF ANY, ON REQUEST.
REQUESTS FOR SUCH REPORTS SHOULD BE DIRECTED TO PAINEWEBBER LIFE INSURANCE
COMPANY, ANNUITY ADMINISTRATION, 601 6TH AVENUE, DES MOINES, IOWA OR BY CALLING,
TOLL FREE, 1-800-647-1568.


     IN ORDER THAT THE PRESENCE OF A QUORUM AT THE MEETING MAY BE ASSURED,
PROMPT EXECUTION AND RETURN OF THE ENCLOSED PROXY IS REQUESTED.  A SELF-
ADDRESSED, POSTAGE-PAID ENVELOPE IS ENCLOSED FOR YOUR CONVENIENCE.

                                                Dianne E. O'Donnell
                                                Secretary

    __, 1995
New York, New York
                       

                                     - 20 -
<PAGE>
 
                                                                       EXHIBIT A
                                SUB-ADVISORY AGREEMENT
                               -----------------------

         Agreement  made  as  of  _______________,  1995  ("Agreement")  between
     MITCHELL HUTCHINS ASSET MANAGEMENT INC., a  Delaware corporation ("Mitchell
     Hutchins"), and PACIFIC  INVESTMENT MANAGEMENT COMPANY, a  Delaware general
     partnership ("Sub-Adviser").

                                       RECITALS
                                       --------
         (1)     Mitchell Hutchins has  entered into an Investment  Advisory and
     Administration  Contract  dated  April  21, 1988,  as  supplemented  by  an
     Investment  Advisory and  Administration  Fee Agreement  dated May  1, 1990
     (together,  referred to  as "Advisory  Contract")  with PaineWebber  Series
     Trust  ("Trust"),  an  open-end  management  investment company  registered
     under the  Investment Company  Act of  1940, as  amended ("1940  Act") with
     respect to  the Strategic  Fixed Income  Portfolio ("Portfolio")  series of
     the Trust (formerly named "Government Portfolio"); and

         (2)     Mitchell Hutchins wishes  to retain the Sub-Adviser  to furnish
     certain investment advisory services to the Portfolio,  and the Sub-Adviser
     is willing to furnish those services;

         NOW, THEREFORE, in consideration  of the premises and mutual  covenants
     herein contained, the parties agree as follows:

         1.      Appointment.      Mitchell   Hutchins   hereby   appoints   the
     Sub-Adviser as an  investment sub-adviser with respect to the Portfolio for
     the period and  on the terms set  forth in this Agreement.  The Sub-Adviser
     accepts  that appointment  and  agrees to  render  the services  herein set
     forth, for the compensation herein provided.

         2.      Duties as Sub-Adviser.
                 ---------------------
         (a)     Subject to  the supervision  of and  any guidelines  adopted by
     the  Trust's  Board  of  Trustees  ("Board")  and  Mitchell  Hutchins,  the
     Sub-Adviser  will   provide  a  continuous   investment  program  for   the
     Portfolio,  including investment research  and management.  The Sub-Adviser
     will determine  from  time to  time  what  investments will  be  purchased,
     retained or  sold by the  Portfolio.  The  Sub-Adviser will  be responsible
     for placing purchase and sell orders for  investments and for other related
     transactions.   The Sub-Adviser will provide  services under this Agreement
     in  accordance with  the  Portfolio's  investment objective,  policies  and
     restrictions as stated in the Trust's Registration Statement.

         (b)     The Sub-Adviser  agrees that, in  placing orders  with brokers,
     it will  obtain  the best  net  result in  terms  of price  and  execution;
     provided that,  on behalf  of the  Portfolio, the  Sub-Adviser may, in  its
     discretion,  use  brokers  who  provide  the   Sub-Adviser  with  research,
     analysis, advice  and similar services  to execute portfolio  transactions,
     and the Sub-Adviser  may pay to those  brokers in return for  brokerage and
     research services  a  higher  commission  than  may  be  charged  by  other
     brokers, subject to the Sub-Adviser's  determining in good faith  that such
<PAGE>
 
     commission is reasonable in terms  either of the particular  transaction or
     of the overall responsibility of the  Sub-Adviser to the Portfolio and  its
     other clients and that  the total commissions paid by the Portfolio will be
     reasonable  in relation  to the  benefits to  the Portfolio  over the  long
     term.  In no instance  will portfolio securities be  purchased from or sold
     to the Sub-Adviser,  or any affiliated person thereof, except in accordance
     with the federal  securities laws and the rules and regulations thereunder.
     The Sub-Adviser may  aggregate sales and  purchase orders  with respect  to
     the assets of the Portfolio  with similar orders being  made simultaneously
     for other accounts advised by the Sub-Adviser or  its affiliates.  Whenever
     the Sub-Adviser simultaneously places orders  to purchase or sell  the same
     security on behalf of  the Portfolio and one or more other accounts advised
     by the Sub-Adviser, the  orders will  be allocated as  to price and  amount
     among  all such accounts in a manner believed  to be equitable over time to
     each  account.  Mitchell  Hutchins  recognizes  that  in  some  cases  this
     procedure may adversely affect the results obtained for the Portfolio.

         (c)     The Sub-Adviser  will maintain all  books and  records required
     to be maintained by the  Sub-Adviser pursuant to the 1940 Act and the rules
     and regulations promulgated  thereunder with respect to transactions by the
     Sub-Adviser  on behalf  of the  Portfolio, and  will furnish the  Board and
     Mitchell Hutchins  with such periodic  and special reports as  the Board or
     Mitchell  Hutchins   reasonably  may  request.   In  compliance  with   the
     requirements  of Rule  31a-3  under the  1940  Act, the  Sub-Adviser hereby
     agrees  that all  records  which it  maintains  for the  Portfolio  are the
     property of  the Trust, agrees  to preserve for  the periods prescribed  by
     Rule 31a-2 under the 1940 Act  any records which it maintains for the Trust
     and which are required to be  maintained by Rule 31a-1 under the 1940  Act,
     and further agrees to surrender promptly to the  Trust any records which it
     maintains for the Portfolio upon request by the Trust.

         (d)     At such times as shall be reasonably requested  by the Board or
     Mitchell  Hutchins, the  Sub-Adviser will  provide  the Board  and Mitchell
     Hutchins  with economic  and  investment analyses  and  reports as  well as
     quarterly  reports  setting  forth the  Portfolio's  performance  and  make
     available to the  Board and Mitchell Hutchins any economic, statistical and
     investment services normally available to institutional  or other customers
     of the Sub-Adviser.

         (e)     In accordance with procedures adopted by  the Board, as amended
     from  time to  time, the Sub-Adviser  is responsible  for assisting  in the
     fair valuation  of all  portfolio securities  and will  use its  reasonable
     efforts  to  arrange for  the provision  of  a price(s)  from  a party(ies)
     independent of  the Sub-Adviser for  each portfolio security  for which the
     custodian does not obtain  prices in the  ordinary course of business  from
     an automated pricing service.

         3.      Further Duties.   In all matters relating to the performance of
     this Agreement, the  Sub-Adviser will act  in conformity  with the  Trust's
     Trust Instrument,  By-Laws and  currently effective registration  statement
     under  the   1940   Act  and   any   amendments  or   supplements   thereto
     ("Registration Statement")  and with the  written instructions and  written

                                        - 2 -
<PAGE>
 
     directions of the  Board and  Mitchell Hutchins  and will  comply with  the
     requirements  of the  1940 Act,  the Investment  Advisers  Act of  1940, as
     amended  ("Advisers Act"),    the rules  under  each, Subchapter  M  of the
     Internal  Revenue  Code  ("Code") as  applicable  to  regulated  investment
     companies,  the diversifications  requirements applicable  to the Portfolio
     under Section  817(h) of  the  Code and  all other  applicable federal  and
     state laws  and regulations.  Mitchell Hutchins  agrees to  provide to  the
     Sub-Adviser copies of  the Trust's Trust Instrument,  By-Laws, Registration
     Statement, written  instructions and  directions of the  Board and Mitchell
     Hutchins, and any  amendments or supplements to  any of these materials  as
     soon  as  practicable  after such  materials  become  available;  provided,
     however,  that  the Sub-Adviser's  duty  under  this  Agreement  to act  in
     conformity  with any  document, instruction, or  guidelines produced by the
     Trust or Mitchell Hutchins  shall not arise until it has been  delivered to
     the Sub-Adviser.  Any changes  to the objectives, policies  or restrictions
     will make  due allowance  for the time  within which the  Sub-Adviser shall
     have to come into compliance.  

         4.      Expenses.  During  the term of this  Agreement, the Sub-Adviser
     will  bear all  expenses incurred  by it  in connection  with its  services
     under  this Agreement.   The Sub-Adviser  shall not be  responsible for any
     expenses incurred by the Trust, the Portfolio or Mitchell Hutchins.

         5.      Compensation.
                 ------------
         (a)     For  the services  provided  and the  expenses  assumed by  the
     Sub-Adviser  pursuant  to  this  Agreement,  Mitchell   Hutchins,  not  the
     Portfolio, will pay  to the Sub-Adviser  a fee, computed daily  and payable
     monthly, at an  annual rate of 0.25%  of the Portfolio's average  daily net
     assets (computed in  the manner specified  in the  Advisory Contract),  and
     will provide  the Sub-Adviser with a  schedule showing the manner  in which
     the fee was computed.

         (b)     The fee  shall be  computed daily  and payable  monthly to  the
     Sub-Adviser  on or  before the  last business  day  of the  next succeeding
     calendar month.

         (c)     For those  periods in  which Mitchell  Hutchins  has agreed  to
     waive  all or a  portion of its management  fee, Mitchell  Hutchins may ask
     the  Sub-Adviser to waive  the same  proportion of  its fees, but  the Sub-
     Adviser is under no obligation to do so.

         (d)     If this  Agreement becomes effective  or terminates  before the
     end of  any month, the fee  for the period  from the effective  date to the
     end  of the  month or  from the  beginning of  such  month to  the date  of
     termination,  as the  case  may be,  shall  be  prorated according  to  the
     proportion which  such  period  bears  to the  full  month  in  which  such
     effectiveness or termination occurs.

         6.      Limitation Of  Liability.  The Sub-Adviser  shall not be liable
     for any  error of judgment or  mistake of law  or for any  loss suffered by
     the Portfolio,  the Trust or  its shareholders or  by Mitchell  Hutchins in

                                        - 3 -
<PAGE>
 
     connection  with the matters to which this Agreement relates, except a loss
     resulting from  willful misfeasance, bad  faith or gross  negligence on its
     part in the performance of  its duties or from reckless disregard  by it of
     its obligations and duties under this Agreement.

         7.      Representations of  Sub-Adviser.   The Sub-Adviser  represents,
     warrants and agrees as follows:

         (a)     The  Sub-Adviser (i)  is registered  as  an investment  adviser
     under the  Advisers Act and will  continue to be so  registered for so long
     as this  Agreement remains in  effect; (ii) is  not prohibited by the  1940
     Act or the Advisers  Act from performing the services  contemplated by this
     Agreement; (iii) has met, and will seek  to continue to meet for so long as
     this Agreement remains  in effect, any  other applicable  federal or  state
     requirements, or  the applicable requirements of any regulatory or industry
     self-regulatory  agency,  necessary to  be  met  in  order  to perform  the
     services contemplated  by this Agreement;  (iv) has the  authority to enter
     into and  perform the services contemplated by this Agreement; and (v) will
     promptly  notify Mitchell  Hutchins  of the  occurrence  of any  event that
     would disqualify the Sub-Adviser from  serving as an investment  adviser of
     an  investment  company  pursuant  to  Section 9(a)  of  the  1940  Act  or
     otherwise.

         (b)     The  Sub-Adviser has adopted a written code of ethics complying
     with the requirements of  Rule 17j-1  under the 1940  Act and will  provide
     Mitchell  Hutchins and  the  Board with  a  copy of  such  code of  ethics,
     together with evidence of its adoption.   Within fifteen days of the end of
     the last calendar  quarter of each year  that this Agreement is  in effect,
     the  president or  a  vice-president of  the  Sub-Adviser shall  certify to
     Mitchell Hutchins that  the Sub-Adviser has complied with  the requirements
     of Rule  17j-1  during  the  previous  year and  that  there  has  been  no
     violation of the Sub-Adviser's  code of ethics or, if such a  violation has
     occurred, that appropriate  action was taken in response to such violation.
     Upon the  written  request  of Mitchell  Hutchins,  the  Sub-Adviser  shall
     permit Mitchell  Hutchins,  its employees  or  its  agents to  examine  the
     reports required to be  made to the Sub-Adviser by Rule 17j-1(c)(1) and all
     other records relevant to the Sub-Adviser's code of ethics.

         (c)     The Sub-Adviser has  provided Mitchell Hutchins with a  copy of
     its  Form ADV  as  most recently  filed  with the  Securities and  Exchange
     Commission ("SEC") and  promptly will furnish a  copy of all  amendments to
     Mitchell Hutchins at least annually.

         (d)     The Sub-Adviser will notify Mitchell  Hutchins of any change of
     control of  the Sub-Adviser, including  any change of  its general partners
     or 25%  shareholders, as applicable, and  any changes in  the key personnel
     who are  either  the  portfolio  manager(s)  of  the  Portfolio  or  senior
     management of  the Sub-Adviser,  in each  case prior to  or promptly  after
     such change.

         8.      Services  Not  Exclusive.    The  Sub-Adviser  may  act  as  an
     investment adviser  to  any other  person,  firm  or corporation,  and  may

                                        - 4 -
<PAGE>
 
     perform  management  and  any   other  services   for  any  other   person,
     association, corporation, firm  or other entity pursuant to any contract or
     otherwise, and take any  action or do anything  in connection therewith  or
     related thereto,  except  as prohibited  by  applicable  law; and  no  such
     performance  of management or  other services or taking  of any such action
     or doing of any such thing shall  be in any manner restricted or  otherwise
     affected by any  aspect of any relationship  of the Sub-Adviser to  or with
     the  Trust, Portfolio  or Mitchell Hutchins  or deemed  to violate  or give
     rise to any duty or obligation of  the Sub-Adviser to the Trust,  Portfolio
     or  Mitchell  Hutchins  except as  otherwise  imposed  by  law or  by  this
     Agreement.

         9.      Duration and Termination.
                 ------------------------
         (a)     This  Agreement shall  become  effective  upon the  date  first
     above written,  provided that this  Agreement shall not  take effect unless
     it has first  been approved (i) by a  vote of a majority of  those trustees
     of the Trust  who are not parties  to this Agreement or  interested persons
     of any  such party, cast in person  at a meeting called  for the purpose of
     voting on such approval, and (ii) by vote of a  majority of the Portfolio's
     outstanding voting securities.

         (b)     Unless  sooner terminated  as  provided herein,  this Agreement
     shall  continue  in  effect  for   two  years  from  its   effective  date.
     Thereafter, if not terminated, this Agreement  shall continue automatically
     for  successive  periods   of  twelve  months  each,  provided   that  such
     continuance is specifically approved at least 
     annually  (i) by a vote  of a majority of  those trustees of  the Trust who
     are not parties to this Agreement or interested  persons of any such party,
     cast  in person  at a  meeting called  for the  purpose of  voting on  such
     approval,  and  (ii) by  the  Board  or  by  vote  of  a  majority  of  the
     outstanding voting securities of the Portfolio.

         (c)     Notwithstanding  the   foregoing,   this   Agreement   may   be
     terminated at any time, without the payment  of any penalty, by vote of the
     Board or  by a vote of  a majority of the  outstanding voting securities of
     the  Portfolio  on  60  days'  written  notice  to  the  Sub-Adviser.  This
     Agreement  may also be  terminated, without the payment  of any penalty, by
     Mitchell Hutchins:  (i) upon 120  days' written notice  to the Sub-Adviser;
     (ii)  immediately upon material  breach by  the Sub-Adviser  of any  of the
     representations and warranties  set forth in Paragraph 7 of this Agreement;
     or (iii) immediately if, in  the reasonable judgment of  Mitchell Hutchins,
     the  Sub-Adviser becomes  unable to  discharge its  duties  and obligations
     under this Agreement, including circumstances such  as financial insolvency
     of the Sub-Adviser or other  circumstances that could adversely  affect the
     Portfolio.   The  Sub-Adviser  may terminate  this  Agreement at  any time,
     without the  payment  of  any  penalty, on  120  days'  written  notice  to
     Mitchell  Hutchins. This  Agreement  will  terminate automatically  in  the
     event of its assignment or upon termination of the Management Agreement.

         10.     Amendment  of this Agreement.   No provision  of this Agreement
     may be  changed, waived, discharged  or terminated orally,  but only  by an

                                        - 5 -
<PAGE>
 
     instrument  in writing signed by the party against which enforcement of the
     change, waiver, discharge or termination is  sought.  No amendment of  this
     Agreement shall be  effective until approved (i) by a vote of a majority of
     those trustees  of the  Trust  who are  not parties  to this  Agreement  or
     interested persons of any such party,  and (ii) by a vote of  a majority of
     the Portfolio's outstanding  voting securities (unless in the case of (ii),
     the  Trust receives  an  SEC order  or  No-Action letter  permitting it  to
     modify the Agreement without such vote).

         11.     Governing  Law.     This  Agreement   shall  be   construed  in
     accordance  with the  1940  Act and  the  laws of  the  State of  Delaware,
     without giving effect to  the conflicts of laws principles  thereof. To the
     extent that the applicable laws of the State of Delaware conflict with  the
     applicable provisions of the 1940 Act, the latter shall control.

         12.     Miscellaneous.   The captions  in this  Agreement are  included
     for convenience of  reference only and in  no way define or delimit  any of
     the provisions hereof  or otherwise affect their construction or effect. If
     any provision of  this Agreement shall be held  or made invalid by  a court
     decision,  statute, rule  or  otherwise, the  remainder  of this  Agreement
     shall  not be  affected thereby. This  Agreement shall be  binding upon and
     shall  inure to  the  benefit of  the parties  hereto and  their respective
     successors.  As  used  in  this  Agreement,  the  terms  "majority  of  the
     outstanding voting  securities," "affiliated  person," "interested person,"
     "assignment," "broker,"  "investment adviser," "net assets," "sale," "sell"
     and "security" shall  have the same meaning as such  terms have in the 1940
     Act,  subject to such exemption as  may be granted by the  SEC by any rule,
     regulation or  order. Where  the  effect of  a requirement  of the  federal
     securities laws reflected in any  provision of this Agreement is  made less
     restrictive by a rule, regulation or order  of the SEC, whether of  special
     or general application, such provision  shall be deemed to  incorporate the
     effect of such rule, regulation  or order.  This Agreement may be signed in
     counterpart.

         13.     Notices.  Any  written notice  herein required to  be given  to
     the Sub-Adviser or  Mitchell Hutchins shall  be deemed to  have been  given
     upon receipt of the same at their respective addresses set forth below.
















                                        - 6 -
<PAGE>
 
         IN WITNESS WHEREOF,  the parties hereto have caused this  instrument to
     be executed by  their duly authorized signatories  as of the date  and year
     first above written.


     Attest:                     MITCHELL HUTCHINS ASSET MANAGEMENT INC.
                                  1285 Avenue of the Americas
                                  New York, New York 10019




                                  By:____________________________________
                                        Name: 
                                        Title: 


     Attest:                     PACIFIC INVESTMENT MANAGEMENT COMPANY    
                                  840 Newport Center Drive
                                  Suite 360
                                  Newport Beach, California 92660
                                           By:  PIMCO Management, Inc.,
                                                its general partner

                                    By:____________________________________
                                         Name: 
                                         Title: 


























                                        - 7 -
<PAGE>
 
                                     PROXY

                          PAINEWEBBER SERIES TRUST --
                             GOVERNMENT PORTFOLIO

             Special Meeting of Shareholders - September 21, 1995

The undersigned hereby appoints as proxies Gregory K. Todd and Ilene Shore and 
each of them (with power of substitution) to represent and direct the voting 
interest of the undersigned held as of the record date at the aforesaid meeting 
and any adjournment thereof with all the power the undersigned would have if 
personally present.  The shares represented by this proxy will be voted as 
instructed.  Unless indicated to the contrary, this proxy shall be deemed to 
grant authority to vote "FOR" all proposals.

This proxy is solicited on behalf of the Board of Trustees of PaineWebber Series
Trust ("Trust").

                            YOUR VOTE IS IMPORTANT

Please date and sign this proxy below and return it in the enclosed envelope to 
PaineWebber Life Insurance Company, Annuity Administration, P.O. Box 10, Des 
Moines, IA 50301-9440.

                      THIS PROXY WILL NOT BE VOTED UNLESS
              IT IS DATED AND SIGNED EXACTLY AS INSTRUCTED BELOW

If shares are held jointly, each Shareholder named should sign.  If only one 
signs, his or her signature will be binding.  If the Shareholder is a 
corporation, the President or a Vice President should sign in his or her own 
name, indicating title.  If the Shareholder is a partnership, a partner should 
sign in his or her own name, indicating that he or she is a "Partner."  If 
signing is by attorney, executor, administrator, trustee, or guardian, please 
give FULL title.  This proxy will not be voted unless it is dated and signed 
exactly as instructed above.

Sign exactly as name(s) appears hereon.

_______________________________ (L.S.)

_______________________________ (L.S.)          Date  ________________, 1995


<PAGE>
 
Please indicate your vote by an "X" in the appropriate box below.

                 The Board of Trustees recommends a vote "FOR"


1.  Approval of a change in the Portfolio's    FOR        AGAINST     ABSTAIN
    investment objective from "high current                                 
    income consistent with the preservation    ------     -------     -------
    of capital and, secondarily, capital 
    appreciation" to "total return consisting
    of capital appreciation and income."

2.  Approval of a Sub-Advisory Agreement       FOR        AGAINST     ABSTAIN
    between Mitchell Hutchins Asset Manage-                                 
    ment Inc. and Pacific Investment           ------     -------     -------
    Management Company, with respect to
    the assets of the Portfolio.

3.  Approval of an amendment to the            FOR        AGAINST     ABSTAIN
    Portfolio's fundamental investment                                      
    limitation governing borrowings to         ------     -------     -------
    increase permissible borrowings from
    10% to 33-1/3% of the Portfolio's assets
    and permit the use of dollar rolls.



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