PAINEWEBBER SECURITIES TRUST
497, 1996-06-12
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<PAGE>
                       PAINEWEBBER SMALL CAP GROWTH FUND
                 (A SERIES OF PAINEWEBBER INVESTMENT TRUST III)
 
                                                                   June 13, 1996
 
Dear Shareholder:
 
    In  1993, Kidder,  Peabody launched  your Fund,  which focuses  on small cap
stocks, and  selected  an  outside  investment  adviser  to  manage  the  Fund's
portfolio.  Mitchell Hutchins took over the administration of your Fund -- which
was renamed PaineWebber Small Cap  Growth Fund -- early in  1995 as a result  of
PaineWebber's  acquisition  of  certain  assets of  Kidder,  Peabody  Group Inc.
PaineWebber also launched a small cap fund in 1993, called PaineWebber Small Cap
Value Fund, and chose an outside investment manager as that Fund's sub-adviser.
 
    While  the  Funds  have  slightly  different  names,  they  have   identical
investment  objectives  and  goals: to  achieve  long-term  capital appreciation
through investment  in  stocks  with  market capitalizations  of  less  than  $1
billion.  (Of the 500 stocks in the  S&P 500 Index, only 34 have capitalizations
of under $1 billion; however, there are thousands of other stocks that meet this
criteria.) Both  managers  sought  to  invest in  companies  whose  stocks  they
considered undervalued -- stocks that should move up in price if certain factors
become  recognized  by the  market. Although  these managers  employed different
strategies to select  the stocks held  in the portfolios,  both Funds  generated
performance  records that many investors found  unsatisfactory. As a result, the
board of each Fund determined to  terminate the sub-adviser and turn  management
of the Funds' portfolios over to Mitchell Hutchins.
 
    As   of  April   1,  1996,   Donald  Jones   assumed  day-to-day  management
responsibility for  both  Funds, under  the  direction of  Mark  Tincher,  Chief
Investment  Officer  for Equities  of Mitchell  Hutchins.  Since that  date, the
Funds' management  has  begun  to  use  an  investment  process  that  evaluates
securities  using  quantitative  measures  to  identify  stocks  that  provide a
combination of value  and momentum  (both price and  earnings). Management  then
applies  fundamental research to  identify those companies  with a catalyst that
may cause  the  stocks' price  to  move up  in  the future.  These  quantifiable
measures,  plus fundamental analysis by our research analysts, enable management
to identify stocks that appear undervalued,  but that have catalysts that  could
close the valuation gap.
 
    Mark  Tincher joined Mitchell Hutchins in March 1995 and, since his arrival,
the Mitchell Hutchins equity team  has refined the investment process  described
above  under his  leadership. Mark  manages PaineWebber  Growth and  Income Fund
utilizing our proprietary quantitative model.  Before joining us, Mark was  head
of  U.S. Funds  Management and Equity  Research for the  Chase Manhattan Private
Bank, which he joined in  1988. While at Chase,  Mark oversaw the management  of
all Chase U.S. equity funds, including its small cap portfolios.
 
    Don  Jones  has  been  managing  both  Funds  since  April  1996,  using the
proprietary quantitative models that have been incorporated into the  management
of  the PaineWebber Stock Funds. Prior  to joining Mitchell Hutchins in February
1996, Mr.  Jones was  vice president  in  the Asset  Management Group  of  First
Fidelity  Bancorporation and a member of  that firm's Value Discipline and Small
Capitalization Stock  Selection Committees.  At First  Fidelity since  1983,  he
served as a quantitative analyst, assisting the Director of Equity Management in
the  design, development  and implementation of  stock selection  models for the
value, growth and small capitalization styles.
 
    As I have written  you before, one goal  since my joining Mitchell  Hutchins
has  been, and continues to be, to focus  on those types of funds most investors
want by  eliminating  funds  with overlapping  objectives.  Now  that  portfolio
management  of the  Funds has been  consolidated at Mitchell  Hutchins under the
management of Mark Tincher and Don  Jones, the board of trustees of  PaineWebber
Small Cap Growth Fund has
<PAGE>
approved  Mitchell Hutchins'  recommendation to  reorganize ("merge")  your Fund
into PaineWebber Small  Cap Value  Fund, and recommends  that you  vote FOR  the
reorganization  proposal. The board  believes that combining  the two Funds will
benefit the shareholders of PaineWebber Small Cap Growth Fund by providing  them
with  a portfolio that has an identical  investment objective and that will have
lower operating  expenses  as a  percentage  of net  assets.  If the  merger  is
approved,  the name of the  combined Fund will be  changed to "PaineWebber Small
Cap Fund."  As I  described our  investment process,  you can  see that  we  are
looking  for the right combination of value  and growth in the stocks we select,
so we think that a distinction between "growth" or "value" is unnecessary in the
Fund's name.
 
    The table below provides you with a brief summary of both Funds, as well  as
of the proposed combined Fund.
 
<TABLE>
<CAPTION>
                       PW SMALL CAP             PW SMALL CAP             COMBINED "PW
                        GROWTH FUND              VALUE FUND             SMALL CAP FUND"
<S>               <C>                      <C>                      <C>
OBJECTIVE         Long-term capital        Long-term capital        Long-term capital
                  appreciation             appreciation             appreciation
DEFINITION OF     Up to $1 billion         Up to $1 billion         Up to $1 billion
SMALL CAP
HOLDINGS          Primarily securities of  At least 65% equity      At least 65% equity
                  small cap companies      securities of small cap  securities of small cap
                                           companies                companies
FOREIGN           Up to 10% of assets,     Up to 25% in U.S.        Up to 25% in U.S.
SECURITIES LIMIT  may be denominated in    dollar-denominated       dollar-denominated
                  foreign currencies       equity securities of     equity securities of
                                           foreign issuers traded   foreign issuers traded
                                           in U.S. markets          in U.S. markets
DEBT SECURITIES   Convertible debt         Up to 10% in bonds,      Up to 10% in bonds,
                  securities purchased     including convertible    including convertible
                  based on their equity    debt securities, rated   debt securities, rated
                  characteristics          no lower than B          no lower than B
</TABLE>
 
    We  have retained an outside firm  that specializes in proxy solicitation to
assist us in connection with  the merger. If we have  not received your vote  as
the  meeting date approaches, you may  receive a telephone call from Shareholder
Communications Corporation ("SCC")  to ask  for your  vote. We  hope that  their
telephone call does not inconvenience you.
 
    I  appreciate that the length of the  attached document may be daunting, but
we have  tried to  make it  as clear  as possible  while meeting  all the  legal
requirements.  The Table of Contents has been expanded to make it easier to find
specific topics of interest. Also, we  have included a section of questions  and
answers that we think will interest most investors.
 
    As  always, I thank you for being an investor in our funds. We are committed
to serving your interests and appreciate your trust in us.
 
                                          Very truly yours,
                                                   [SIG]
                                          Margo Alexander
                                          PRESIDENT
                                          PAINEWEBBER SMALL CAP GROWTH FUND
<PAGE>
                              QUESTIONS & ANSWERS
 
    Q: WHY IS THIS MERGER BEING PROPOSED?
 
    A: If approved by the shareholders of PaineWebber Small Cap Growth Fund, the
combined PaineWebber Small Cap Fund will be better positioned for future growth.
As  PaineWebber Small Cap Value Fund and  PaineWebber Small Cap Growth Fund have
identical investment objectives, they would compete with each other for the same
pool of potential investors if  they remained as they  are now. The merger  will
also  permit  Mitchell Hutchins  to  offer investors  one  core small  cap fund,
managed in a way intended to improve risk-adjusted performance.
 
    Q:WHY WAS THIS MERGER NOT PROPOSED IN THE PROXY STATEMENT I RECEIVED EARLIER
      THIS YEAR?
 
    A: Mitchell Hutchins was not in a position to propose the merger at the time
your Fund's board  nominated trustees  for election and  approved the  proposals
submitted  to  shareholders earlier  this  year. Margo  Alexander,  President of
Mitchell Hutchins, and Mark Tincher, Chief Investment Officer for Equities, were
conducting a search for a day-to-day portfolio manager with experience in  small
cap   securities  and  an  investment   management  style  consistent  with  our
quantitative investment strategy.  With Don  Jones on  board, Mitchell  Hutchins
proposed the merger to the board and it approved the merger proposal.
 
    Q: HOW WILL THE MERGER AFFECT THE FUNDS' EXPENSES?
 
    A:  It is  important to  note that while  PaineWebber Small  Cap Value Fund,
which is the surviving Fund in the merger, has an advisory fee higher than  your
Fund's  fee, the combined Fund  is expected to have  lower overall expenses than
your Fund currently has, due to its larger asset base. Larger funds may  achieve
economies  of scale not attainable by smaller funds. As you can see in the table
below,  our  analysis  indicates  that  shareholders  of  both  your  Fund   and
PaineWebber  Small Cap  Value Fund  should benefit  from a  lower expense ratio.
(Note that operating expenses for the combined Fund are expressed on a pro forma
basis. For more details about fees and expenses, see "Synopsis--Comparative  Fee
Table" on pages 3-7 of the proxy statement.)
 
                         TOTAL FUND OPERATING EXPENSES
                           (INCLUDING ADVISORY FEES)
 
<TABLE>
<CAPTION>
           PAINEWEBBER SMALL CAP   PAINEWEBBER SMALL CAP    COMBINED "PAINEWEBBER
                 VALUE FUND             GROWTH FUND            SMALL CAP FUND"
           ----------------------  ----------------------  -----------------------
<S>        <C>                     <C>                     <C>
CLASS A            1.97%                   1.91%                    1.78%
CLASS B            2.72%                   2.64%                    2.56%
CLASS C            2.71%                   2.66%                    2.54%
CLASS Y             N/A                    1.66%                    1.53%
</TABLE>
 
    Q: WILL THE MERGER SUBJECT ME TO ANY TAXES?
 
    A:  The merger  is structured to  be a tax-free  reorganization, which means
that no gain or loss will be recognized by either Fund or by you as a result  of
your acquisition of PaineWebber Small Cap Value Fund shares through the merger.
 
    If  you do not wish to receive shares of PaineWebber Small Cap Value Fund in
the merger, you are  free to exchange  your Fund shares for  shares of the  same
class  of any other PaineWebber fund prior to the closing. However, keep in mind
that you will recognize a gain or loss -- that is, experience a taxable event --
if you exchange your Fund shares for shares of a different fund.
<PAGE>
    Also in connection  with the merger,  PaineWebber Small Cap  Growth Fund  is
required  to declare and pay to its shareholders any distributions of income and
capital gains it has accrued during its fiscal year prior to the closing of  the
merger.  Accordingly, you  can expect to  receive a distribution  of income (and
capital gains, if any) from  the Fund at the end  of July. That distribution  is
taxable.
 
    Q: HOW MANY SHARES WILL I RECEIVE IN THE MERGER?
 
    A:  If the merger is  approved, as a holder  of PaineWebber Small Cap Growth
Fund, you will receive the class of  shares of PaineWebber Small Cap Value  Fund
that  correspond to the class of shares of PaineWebber Small Cap Growth Fund you
now hold. The number of PaineWebber Small Cap Value Fund shares you will receive
will depend on the net asset value (NAV) of each class of the Funds at the  time
of the closing of the merger.
 
    For  example, on March 31, 1996, the  NAV per share of PaineWebber Small Cap
Growth Fund Class A was  $12.93 and the NAV per  share of PaineWebber Small  Cap
Value  Fund Class A was  $11.11. If the merger had  been completed on that date,
you would have received  1.163816 Class A shares  ($12.93 DIVIDED BY $11.11)  of
PaineWebber Small Cap Value Fund for each Class A share of PaineWebber Small Cap
Growth  Fund you owned. The  overall value of your  investment would not change,
but the  number of  shares you  own  and the  NAV per  share would  differ.  For
example,  if you owned 1,000 shares of PaineWebber Small Cap Growth Fund and the
merger had  been  completed  on  that  date,  you  would  own  1,163.816  shares
afterward:  1,000 shares times $12.93 = $12,930 or 1,163.816 shares times $11.11
= $12,930.
 
    Q: WHAT CLASS OF SHARES WILL I OWN?
 
    A: You will own the same class of shares of PaineWebber Small Cap Value Fund
that you owned  in PaineWebber Small  Cap Growth Fund.  If you hold  PaineWebber
Small  Cap Growth Fund shares subject to a contingent deferred sales charge (for
example, Class B shares purchased within the  last six years, or Class C  shares
purchased  within the last year), you will receive credit for the length of time
that you have held your shares of PaineWebber Small Cap Growth Fund.
 
    Q: WHAT IS MY BOARD'S RECOMMENDATION?
 
    A: Your board of trustees recommends a vote "FOR" the merger.
<PAGE>
                       PAINEWEBBER SMALL CAP GROWTH FUND
                 (A SERIES OF PAINEWEBBER INVESTMENT TRUST III)
                             ---------------------
 
                                   NOTICE OF
                        SPECIAL MEETING OF SHAREHOLDERS
                                 JULY 19, 1996
                             ---------------------
 
To the Shareholders:
 
    A  special  meeting of  shareholders  ("Meeting") of  PaineWebber  Small Cap
Growth Fund ("Growth Fund"), a series of PaineWebber Investment Trust III,  will
be  held on July  19, 1996, 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 an  Agreement and  Plan of  Reorganization and  Termination
under  which  PaineWebber  Small Cap  Value  Fund  ("Value Fund"),  a  series of
PaineWebber Securities  Trust,  would  acquire  the assets  of  Growth  Fund  in
exchange  solely  for  shares  of  beneficial interest  in  Value  Fund  and the
assumption  by  Value  Fund  of  Growth  Fund's  liabilities,  followed  by  the
distribution  of  those  shares  to  the shareholders  of  Growth  Fund,  all as
described in the accompanying Prospectus/Proxy Statement; and
 
    (2) To transact such other business as may properly come before the  Meeting
or any adjournment thereof.
 
    You  are entitled to vote at the  Meeting and any adjournment thereof if you
owned shares of Growth  Fund at the close  of business on May  17, 1996. IF  YOU
ATTEND  THE MEETING, YOU MAY VOTE YOUR SHARES IN PERSON. IF YOU DO NOT EXPECT TO
ATTEND THE MEETING, PLEASE  COMPLETE, DATE, SIGN AND  RETURN THE ENCLOSED  PROXY
CARD IN THE ENCLOSED POSTAGE PAID ENVELOPE.
 
                                          By order of the board of trustees,
 
                                          DIANNE E. O'DONNELL
                                          SECRETARY
 
June 13, 1996
1285 Avenue of the Americas
New York, New York 10019
 
                             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"  THE PROPOSAL  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.
<PAGE>
                        PAINEWEBBER SMALL CAP VALUE FUND
                   (A SERIES OF PAINEWEBBER SECURITIES TRUST)
 
                       PAINEWEBBER SMALL CAP GROWTH FUND
                 (A SERIES OF PAINEWEBBER INVESTMENT TRUST III)
 
                          1285 AVENUE OF THE AMERICAS
                            NEW YORK, NEW YORK 10019
                           (TOLL FREE) 1-800-647-1568
 
                           PROSPECTUS/PROXY STATEMENT
                                 JUNE 13, 1996
 
    This  Prospectus/Proxy Statement  ("Proxy Statement") is  being furnished to
shareholders of PaineWebber Small Cap Growth  Fund ("Growth Fund"), a series  of
PaineWebber  Investment Trust III  ("Investment Trust"), in  connection with the
solicitation of proxies  by Investment Trust's  board of trustees  for use at  a
special  meeting of  Growth Fund shareholders  to be  held on July  19, 1996, at
10:00 a.m., Eastern time, and at any adjournment thereof ("Meeting").
 
    As more fully described in this Proxy Statement, the primary purpose of  the
Meeting  is to vote  on a proposed  reorganization ("Reorganization"). Under the
Reorganization, PaineWebber Small  Cap Value  Fund ("Value Fund"),  a series  of
PaineWebber  Securities Trust ("Securities Trust"),  would acquire the assets of
Growth Fund, in exchange solely for shares of beneficial interest in Value  Fund
and  the assumption by Value Fund of Growth Fund's liabilities. Those Value Fund
shares then would be distributed to  the shareholders of Growth Fund, by  class,
so  that each  shareholder of  Growth Fund  would receive  a number  of full and
fractional shares of  the applicable  class of  Value Fund  having an  aggregate
value  that,  on the  effective  date of  the  Reorganization, is  equal  to the
aggregate net asset value of the shareholder's shares of the corresponding class
in Growth Fund. As soon as  practicable following the distribution, Growth  Fund
will be terminated.
 
    Value Fund is a diversified series of Securities Trust, which is an open-end
management  investment company. Value Fund seeks long-term capital appreciation;
it invests primarily  in equity  securities of  small capitalization  companies.
Upon completion of the Reorganization, the name of Value Fund will be changed to
"PaineWebber Small Cap Fund."
 
THESE  SECURITIES HAVE  NOT BEEN APPROVED  OR DISAPPROVED BY  THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE  SECURITIES COMMISSION, NOR HAS THE  SECURITIES
AND  EXCHANGE  COMMISSION OR  ANY STATE  SECURITIES  COMMISSION PASSED  UPON THE
ACCURACY OR ADEQUACY OF THIS  PROSPECTUS/PROXY STATEMENT. ANY REPRESENTATION  TO
THE CONTRARY IS A CRIMINAL OFFENSE.
 
    This  Proxy Statement, which  should be retained  for future reference, sets
forth concisely the information about the  Reorganization and Value Fund that  a
shareholder  should know before  voting. A Statement  of Additional Information,
dated June 13,  1996, relating  to the Reorganization  and including  historical
financial statements, has been filed with the Securities and Exchange Commission
("SEC")  and is  incorporated herein  by this  reference. A  Prospectus of Value
Fund, dated May 1, 1996 ("Value Fund Prospectus"), and a Statement of Additional
Information of  Value Fund,  also dated  May 1,  1996, and  Value Fund's  Annual
Report  to Shareholders  for the  fiscal year ended  July 31,  1995 ("Value Fund
Annual Report"), also have been filed  with the SEC and are incorporated  herein
by this reference. Prospectuses of Growth Fund, both
<PAGE>
dated December 1, 1995 (as supplemented February 9, 1996 and May 9, 1996), and a
Statement of
Additional  Information of Growth Fund, dated  December 1, 1995 (as supplemented
March 1, 1996), also have been filed with the SEC and are incorporated herein by
this reference. Copies of  the Value Fund Prospectus  and the Value Fund  Annual
Report accompany this Prospectus/Proxy Statement. Copies of the other referenced
documents, as well as Growth Fund's Annual Report to Shareholders for the fiscal
year  ended July 31, 1995,  and each Fund's semi-annual  report, may be obtained
without  charge,  and  further  inquiries  may  be  made,  by  contacting   your
PaineWebber  Incorporated ("PaineWebber") investment  executive or PaineWebber's
correspondent firms or by calling toll-free 1-800-647-1568.
<PAGE>
                               TABLE OF CONTENTS
 
<TABLE>
<S>                                                                                     <C>
VOTING INFORMATION....................................................................          1
 
SYNOPSIS..............................................................................          2
    The Proposed Reorganization.......................................................          2
    Comparative Fee Table.............................................................          3
    Forms of Organization.............................................................          7
    Investment Objectives and Policies................................................          7
    Operations of Value Fund Following the Reorganization.............................          9
    Purchases.........................................................................          9
    Redemptions.......................................................................         10
    Exchanges.........................................................................         11
    Dividends and Other Distributions.................................................         11
    Federal Income Tax Consequences of the Reorganization.............................         12
 
COMPARISON OF PRINCIPAL RISK FACTORS..................................................         12
 
THE PROPOSED TRANSACTION..............................................................         13
    Reorganization Plan...............................................................         13
    Reasons for the Reorganization....................................................         14
    Description of Securities to be Issued............................................         15
    Federal Income Tax Considerations.................................................         16
    Capitalization....................................................................         17
 
MISCELLANEOUS.........................................................................         18
    Available Information.............................................................         18
    Legal Matters.....................................................................         18
    Experts...........................................................................         18
 
APPENDIX A -- AGREEMENT AND PLAN OF REORGANIZATION AND TERMINATION....................        A-1
</TABLE>
<PAGE>
                       PAINEWEBBER SMALL CAP GROWTH FUND
                 (A SERIES OF PAINEWEBBER INVESTMENT TRUST III)
                             ---------------------
 
                           PROSPECTUS/PROXY STATEMENT
 
                        SPECIAL MEETING OF SHAREHOLDERS
                                 TO BE HELD ON
                                 JULY 19, 1996
 
                            ------------------------
 
                               VOTING INFORMATION
 
    This  Prospectus/Proxy Statement  ("Proxy Statement") is  being furnished to
shareholders of PaineWebber Small Cap Growth  Fund ("Growth Fund"), a series  of
PaineWebber  Investment Trust III  ("Investment Trust"), in  connection with the
solicitation of proxies by its board of trustees for use at a special meeting of
shareholders to  be  held on  July  19, 1996,  and  at any  adjournment  thereof
("Meeting").  This Proxy  Statement will first  be mailed to  shareholders on or
about June 13, 1996.
 
    At least thirty percent of Growth Fund's outstanding shares on May 17, 1996,
represented in  person or  by proxy,  must  be present  for the  transaction  of
business  at the Meeting. If a quorum is  not present at the Meeting or a quorum
is present but sufficient  votes to approve the  proposal are not received,  the
persons  named as proxies may propose one or more adjournments of the Meeting to
permit further solicitation of  proxies. Any such  adjournment will require  the
affirmative  vote of a  majority of those  shares represented at  the Meeting in
person or by proxy. The  persons named as proxies  will vote those proxies  that
they  are entitled to vote FOR the proposal  in favor of such an adjournment and
will vote those proxies required to  be voted AGAINST the proposal against  such
adjournment.  A shareholder  vote may  be taken  on the  proposal in  this Proxy
Statement prior to any such adjournment  if sufficient votes have been  received
and it is otherwise appropriate.
 
    Broker  non-votes  are  shares held  in  street  name for  which  the broker
indicates that instructions have not been received from the beneficial owners or
other persons  entitled to  vote, and  the broker  does not  have  discretionary
voting  authority. Abstentions  and broker non-votes  will be  counted as shares
present for purposes of determining whether a quorum is present but will not  be
voted  for or against any adjournment  or proposal. Accordingly, abstentions and
broker non-votes effectively will be a vote against adjournment and against  the
proposal,  because the required  vote is a  percentage of the  shares present or
outstanding.
 
    The individuals named  as proxies on  the enclosed proxy  card will vote  in
accordance  with  your direction  as indicated  thereon, if  your proxy  card is
received  properly  executed  by  you  or  by  your  duly  appointed  agent   or
attorney-in-fact.  If you  sign, date  and return  the proxy  card, but  give no
voting instructions, your shares will be voted for approval of the Agreement and
Plan  of  Reorganization   and  Termination,   dated  as  of   April  24,   1996
("Reorganization  Plan"), which is attached to  this Proxy Statement as Appendix
A. Under  the Reorganization  Plan,  PaineWebber Small  Cap Value  Fund  ("Value
Fund"),  a series  of PaineWebber  Securities Trust  ("Securities Trust"), would
acquire the assets of  Growth Fund in exchange  solely for shares of  beneficial
interest  in  Value Fund  and  the assumption  by  Value Fund  of  Growth Fund's
liabilities; those Value Fund shares then would be constructively distributed to
Growth Fund's  shareholders. (These  transactions are  collectively referred  to
herein  as the "Reorganization," and Growth Fund  and Value Fund may be referred
to herein  individually  as  a  "Fund"  or,  collectively,  as  "Funds").  After
completion of the Reorganization, Growth Fund will be terminated.
<PAGE>
    If   you  sign,  date  and  return  the  proxy  card,  but  give  no  voting
instructions, the  duly  appointed  proxies  may  vote  your  shares,  in  their
discretion,  upon such  other matters  as may come  before the  Meeting. You may
revoke the proxy card by giving another proxy or by letter or telegram  revoking
the  initial  proxy.  To  be  effective, such  revocation  must  be  received by
Investment Trust prior to  the Meeting and must  indicate your name and  account
number.  In addition, if you attend the Meeting  in person you may, if you wish,
vote by ballot at the Meeting, thereby canceling any proxy previously given.
 
    As of May 17, 1996 ("Record Date"), Growth Fund had 2,282,796.008 shares  of
beneficial  interest outstanding. The solicitation of proxies, the cost of which
will be borne by the Funds in proportion to their respective net assets, will be
made primarily by mail but also may include telephone or oral communications  by
representatives   of   Mitchell  Hutchins   Asset  Management   Inc.  ("Mitchell
Hutchins"), who will not receive any compensation therefor from the Funds, or by
Shareholder Communications Corporation,  professional proxy solicitors  retained
by Growth Fund, who will be paid fees and expenses of up to approximately $2,400
for soliciting services.
 
    Management  does not know of any single shareholder or "group" (as that term
is used  in Section  13(d) of  the Securities  Exchange Act  of 1934)  who  owns
beneficially more than 5% of the shares of either Fund. Trustees and officers of
Securities Trust own in the aggregate less than 1% of the shares of Value Fund.
 
    Approval  of  the Reorganization  Plan requires  the  affirmative vote  of a
majority of the outstanding voting securities of Growth Fund. As defined in  the
Investment Company Act of 1940 ("1940 Act"), "majority of the outstanding voting
securities"  means the lesser  of (1) 67%  of Growth Fund's  shares present at a
meeting of shareholders if the owners of  more than 50% of Growth Fund's  shares
then  outstanding are  present in  person or by  proxy or  (2) more  than 50% of
Growth Fund's outstanding shares. Each outstanding full share of Growth Fund  is
entitled  to one vote, and each outstanding fractional share thereof is entitled
to a proportionate share of one  vote. Although the shareholders of Growth  Fund
may exchange or redeem out of the Fund, they do not have appraisal rights.
 
                                    SYNOPSIS
 
    The  following is  a summary of  certain information  contained elsewhere in
this Proxy  Statement, the  Prospectuses of  the Funds,  which are  incorporated
herein  by reference, and the Reorganization Plan. Shareholders should read this
Proxy Statement and the Value Fund Prospectus carefully. As discussed more fully
below, Investment Trust's  board of  trustees believes  that the  Reorganization
will  benefit Growth Fund's shareholders. Value Fund has an investment objective
that is identical to the investment objective  of Growth Fund and has a  similar
investment strategy.
 
THE PROPOSED REORGANIZATION
 
    Investment  Trust's board of trustees approved  the Reorganization Plan at a
meeting held  on  April 18,  1996.  The  Reorganization Plan  provides  for  the
acquisition  of the assets of Growth Fund  by Value Fund, in exchange solely for
shares of Value  Fund and the  assumption by  Value Fund of  the liabilities  of
Growth  Fund. Growth Fund will then distribute those shares of Value Fund to its
shareholders, by class, so  that each Growth Fund  shareholder will receive  the
number  of full and fractional shares of the corresponding Value Fund class (see
below) that is equal  in value to  the value of  such shareholder's holdings  in
Growth Fund as of
 
                                       2
<PAGE>
the Closing Date (defined below). Growth Fund then will be terminated as soon as
practicable thereafter. Upon completion of the Reorganization, the name of Value
Fund will be changed to "PaineWebber Small Cap Fund."
 
    The  exchange of Growth Fund's assets for Value Fund shares and Value Fund's
assumption of Growth  Fund's liabilities  will occur  as of  4:00 p.m.,  Eastern
time,  on July 26, 1996, or  on a later date when  the conditions to the closing
are satisfied ("Closing Date").
 
    Value Fund currently offers for sale three classes of shares (each a "Class"
and, collectively,  "Classes"), designated  as  Class A,  Class  B and  Class  C
shares.  Value Fund has  authorized, and in  connection with the Reorganization,
will issue for sale,  Class Y shares.  Growth Fund has  four classes of  shares,
designated   as  Class  A,  Class  B,  Class  C  and  Class  Y  shares.  In  the
Reorganization, shareholders of Growth Fund Class A, Class B, Class C and  Class
Y  shares  will  receive  Class  A,  Class  B,  Class  C  and  Class  Y  shares,
respectively, of  Value Fund.  Shares of  Growth  Fund which  are subject  to  a
contingent   deferred  sales  charge   would  be  replaced   by  shares  of  the
corresponding class of Value Fund without the payment of any contingent deferred
sales charge  that might  otherwise be  due  upon a  redemption of  Growth  Fund
shares.  For purposes  of computing  the contingent  deferred sales  charge that
might be payable upon a  disposition of the shares acquired  as a result of  the
Reorganization,  the  time holding  period for  the  previously owned  shares of
Growth Fund is "tacked" to the holding period for the Value Fund shares received
in the Reorganization. Thus, shareholders would receive credit for the length of
time they have held their shares of Growth Fund.
 
    For the reasons set forth below  under "The Proposed Transaction --  Reasons
for  the Reorganization,"  Investment Trust's  board of  trustees, including the
trustees who are not "interested persons," as  that term is defined in the  1940
Act,  of either Investment  Trust or Securities  Trust ("Independent Trustees"),
has determined that the Reorganization is in the best interests of Growth  Fund,
that  the  terms of  the Reorganization  are  fair and  reasonable and  that the
interests of Growth Fund's shareholders will not  be diluted as a result of  the
Reorganization.  Accordingly,  Investment Trust's  board of  trustees recommends
approval of the transaction. In addition, Securities Trust's board of  trustees,
including its Independent Trustees, has determined that the Reorganization is in
the  best interests of Value Fund, that the terms of the Reorganization are fair
and reasonable, and that the interests of Value Fund's shareholders will not  be
diluted as a result of the Reorganization.
 
COMPARATIVE FEE TABLE
 
    Each  Fund's Class A shares  normally are sold with  a maximum initial sales
charge of 4.5%  of the public  offering price.  However, the Class  A shares  of
Value  Fund that will be  distributed to shareholders of  Growth Fund as part of
the Reorganization will not be subject to an initial sales charge. Following the
Reorganization, new purchases of Class A shares of Value Fund will be subject to
an initial sales charge of up to 4.5%.
 
    Shareholders of the Class A, Class B  and Class C shares of Growth Fund  pay
12b-1  fees that  are identical to  those paid  by shareholders of  the Class A,
Class B and Class C shares, respectively, of Value Fund. No 12b-1 fees are  paid
by  the  Class  Y shareholders  of  Growth Fund,  or  will  be paid  by  Class Y
shareholders of Value Fund, but Class Y shareholders of either Fund who hold (or
who will hold)  their Class  Y shares  through the  INSIGHT Investment  Advisory
Program-SM-  ("INSIGHT") must pay  to PaineWebber an  annual investment advisory
fee of up to 1.5% of the average daily value of the shares.
 
    However, certain  fees  and expenses  that  Value Fund's  shareholders  pay,
directly  or  indirectly,  are  different from  those  incurred  by  Growth Fund
shareholders. Shareholders of Growth Fund are not charged
 
                                       3
<PAGE>
a fee for exchanges of the Fund's shares for shares of a corresponding class  of
other PaineWebber mutual funds. Value Fund shareholders pay a $5.00 fee for each
exchange,  which fee will  continue to be  imposed on exchanges  from Value Fund
following  the  Reorganization.   Value  Fund   pays  PaineWebber   Incorporated
("PaineWebber")  an annual fee  of $4.00 per active  shareholder account held at
PaineWebber for  certain services  not provided  by the  Fund's transfer  agent.
Growth Fund does not pay this fee.
 
    Mitchell  Hutchins is paid an investment  management fee for its services to
Value Fund, computed daily and  payable monthly, at an  annual rate of 1.00%  of
Value  Fund's average daily net assets.  Mitchell Hutchins is paid an investment
management fee  for its  services to  Growth Fund,  computed daily  and  payable
monthly, at an annual rate of 1.00% of Growth Fund's average daily net assets on
assets up to but not including $25 million and .90% thereafter.
 
    The  following tables  show (1)  shareholder transaction  expenses currently
incurred by Class A,  Class B, Class C  and Class Y shares  of Growth Fund,  and
shareholder  transaction expenses that each class issued by Value Fund issued in
the Reorganization will incur after giving effect to the Reorganization, and (2)
the current fees  and expenses incurred  by the Class  A, Class B,  Class C  and
Class  Y shares of Growth Fund and Class A,  Class B and Class C shares of Value
Fund for the  twelve months ended  January 31, 1996  (unaudited), and pro  forma
fees  for Value Fund's Class A, Class B, Class C and Class Y shares after giving
effect to the Reorganization.
 
SHAREHOLDER TRANSACTION EXPENSES(1)
 
<TABLE>
<CAPTION>
                                       GROWTH FUND                                COMBINED FUND
                        ------------------------------------------  ------------------------------------------
                          CLASS      CLASS      CLASS      CLASS      CLASS      CLASS      CLASS      CLASS
                            A          B          C          Y          A          B          C          Y
                        ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
<S>                     <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
Maximum sales charge
 (as a percentage of
 public offering
 price)...............       4.5%       NONE       NONE       NONE       4.5%       NONE       NONE       NONE
Sales charge on
 reinvested
 dividends............       NONE       NONE       NONE       NONE       NONE       NONE       NONE       NONE
Exchange fee..........       NONE       NONE       NONE      N/A(4)     $5.00      $5.00      $5.00      N/A(4)
Maximum contingent
 deferred sales charge
 (as a percentage of
 redemption
 proceeds)............     NONE(2)        5%       1%(3)      NONE     NONE(2)        5%       1%(3)      NONE
</TABLE>
 
                                       4
<PAGE>
ANNUAL FUND OPERATING EXPENSES
(as a percentage of average net assets)
<TABLE>
<CAPTION>
                                                   GROWTH FUND                 VALUE FUND
                                          -----------------------------   ---------------------
                                          CLASS   CLASS   CLASS   CLASS   CLASS   CLASS   CLASS
                                            A       B       C     Y(5)      A       B       C
                                          -----   -----   -----   -----   -----   -----   -----
Management Fees(6)......................  0.95%   0.95%   0.95%   0.95%   1.00%   1.00%   1.00%
<S>                                       <C>     <C>     <C>     <C>     <C>     <C>     <C>
12b-1 Fees..............................  0.25%   1.00%   1.00%   0.00%   0.25%   1.00%   1.00%
Other Expenses..........................  0.71%   0.69%   0.71%   0.71%   0.72%   0.72%   0.71%
                                          -----   -----   -----   -----   -----   -----   -----
Total Fund Operating Expenses(7)........  1.91%   2.64%   2.66%   1.66%   1.97%   2.72%   2.71%
                                          -----   -----   -----   -----   -----   -----   -----
                                          -----   -----   -----   -----   -----   -----   -----
 
<CAPTION>
                                                  COMBINED FUND
                                                   (PRO FORMA)
                                          -----------------------------
                                          CLASS   CLASS   CLASS   CLASS
                                            A       B       C     Y(5)
                                          -----   -----   -----   -----
Management Fees(6)......................  1.00%   1.00%   1.00%   1.00%
<S>                                       <C>     <C>     <C>     <C>
12b-1 Fees..............................  0.25%   1.00%   1.00%   0.00%
Other Expenses..........................  0.53%   0.56%   0.54%   0.53%
                                          -----   -----   -----   -----
Total Fund Operating Expenses(7)........  1.78%   2.56%   2.54%   1.53%
                                          -----   -----   -----   -----
                                          -----   -----   -----   -----
</TABLE>
 
- ------------------------
 
(1)  Sales charge waivers are available for all shares and reduced sales  charge
    purchase  plans are available for Class  A shares. The maximum 5% contingent
    sales charge of Class B shares applies to redemptions during the first  year
    after  purchase; the  charge generally  declines by  1% annually thereafter,
    reaching zero after six years. See "Purchases."
 
(2)  Purchases of  Class A shares  of $1 million  or more are  not subject to  a
    sales  charge. If  such sales  are redeemed within  one year  of purchase, a
    contingent deferred  sales  charge  of  1% will  be  applied  to  most  such
    redemptions.
 
(3)   If Class C  shares are redeemed within one  year of purchase, a contingent
    deferred sales charge of  1% will be applied  to most such redemptions.  See
    "Purchases."
 
(4)   Class  Y shares of  either Fund are  not exchangeable for  shares of other
    PaineWebber mutual funds.
 
(5)  Maximum annual 1.5% advisory fee is payable by shareholders holding Class Y
    shares through INSIGHT.
 
(6)  The management fees paid by  the Funds, although higher than those paid  by
    most  other mutual funds, are believed by Mitchell Hutchins to be within the
    range charged to  other investment  companies that invest  in securities  of
    small capitalization companies.
 
(7)   For  the fiscal year  ended July 31,  1995, the ratios  of total operating
    expenses as a percentage of average  net assets were 1.72%, 2.48% and  1.48%
    for  Class A, Class C  and Class Y shares,  respectively, of Growth Fund and
    were 1.98%,  2.74% and  2.73%  for Class  A, Class  B  and Class  C  shares,
    respectively,  of Value Fund. Class B shares of Growth Fund were not offered
    prior to December 1, 1995.
 
EXAMPLE OF EFFECT ON FUND EXPENSES
 
    The following illustrates the expenses on a $1,000 investment under the fees
and expenses stated  above, assuming a  5% annual return.  The fees shown  below
reflect   an   initial   sales   charge   of   up   to   4.5%   of   the  public
 
                                       5
<PAGE>
offering price that  normally is  charged in connection  with the  sale of  each
Fund's  Class A  shares. However,  no initial sales  charges will  be charged in
connection with Class A shares of Value Fund distributed to Class A shareholders
of Growth Fund as part of the Reorganization.
 
<TABLE>
<CAPTION>
                                        ONE YEAR          THREE YEARS        FIVE YEARS        TEN YEARS
                                     ---------------  -------------------  ---------------  ---------------
<S>                                  <C>              <C>                  <C>              <C>
GROWTH FUND
  Class A shares(1)................     $      64          $     102          $     144        $     258
  Class B shares:
    Assuming a complete redemption
     at end of period(2)(3)........     $      77          $     112          $     160        $     263
    Assuming no redemption(3)......     $      27          $      82          $     140        $     263
  Class C shares:
    Assuming a complete redemption
     at end of period(2)...........     $      37          $      83          $     141        $     299
    Assuming no redemption.........     $      27          $      83          $     141        $     299
  Class Y shares(4)................     $      17          $      52          $      90        $     197
VALUE FUND
  Class A shares(1)................     $      64          $     104          $     146        $     264
  Class B shares:
    Assuming a complete redemption
     at end of period(2)(3)........     $      78          $     114          $     164        $     271
    Assuming no redemption(3)......     $      28          $      84          $     144        $     271
  Class C shares:
    Assuming a complete redemption
     at end of period(2)...........     $      37          $      84          $     143        $     304
    Assuming no redemption.........     $      27          $      84          $     143        $     304
COMBINED FUND
  Class A shares(1)................     $      62          $      99          $     137        $     245
  Class B shares:
    Assuming a complete redemption
     at end of period(2)(3)........     $      76          $     110          $     156        $     253
    Assuming no redemption(3)......     $      26          $      80          $     136        $     253
  Class C shares:
    Assuming a complete redemption
     at end of period(2)...........     $      36          $      79          $     135        $     288
    Assuming no redemption.........     $      26          $      79          $     135        $     288
  Class Y shares(4)................     $      16          $      48          $      83        $     182
</TABLE>
 
- ------------------------
 
(1)  Assumes deduction at the time of purchase of the maximum 4.5% initial sales
    charge.
 
(2)   Assumes deduction  at the  time of  redemption of  the maximum  applicable
    contingent deferred sales charge.
 
(3)   Ten-year figures assume conversion of Class  B shares to Class A shares at
    end of sixth year.
 
(4)  Does  not include  advisory fees payable  by shareholders  holding Class  Y
    shares through INSIGHT.
 
                                       6
<PAGE>
    Long-term  shareholders may  pay more  than the  economic equivalent  of the
maximum front-end  sales  charges  permitted  by  the  National  Association  of
Securities  Dealers,  Inc. rules  regarding  investment companies.  This Example
assumes that all dividends and other  distributions are reinvested and that  the
percentage  amounts listed under Annual Fund  Operating Expenses remain the same
in the years shown. The above tables and  the assumption in the Example of a  5%
annual  return  are  required  by regulations  of  the  Securities  and Exchange
Commission ("SEC") applicable to all mutual funds; the assumed 5% annual  return
is  not  a  prediction of,  and  does  not represent,  the  projected  or actual
performance of any Class of the Funds' shares.
 
    THIS EXAMPLE SHOULD  NOT BE CONSIDERED  A REPRESENTATION OF  PAST OR  FUTURE
EXPENSES, AND A FUND'S ACTUAL EXPENSES MAY BE MORE OR LESS THAN THOSE SHOWN. The
actual  expenses attributable to each Class of a Fund's shares will depend upon,
among other things, the level  of average net assets and  the extent to which  a
Fund incurs variable expenses, such as transfer agency costs.
 
FORMS OF ORGANIZATION
 
    Securities  Trust and  Investment Trust  (each a  "Trust" and, collectively,
"Trusts")  are   open-end   management   investment   companies   organized   as
Massachusetts  business trusts. Value Fund is a diversified series of Securities
Trust, which is organized under a  Declaration of Trust dated December 3,  1992.
Growth  Fund is  a diversified  series of  Investment Trust,  which is organized
under a Declaration of  Trust dated April 8,  1993. Each Trust's Declaration  of
Trust authorizes its trustees to create separate series and, within each series,
separate  classes, of an unlimited number  of shares of beneficial interest, par
value of $.001  per share.  Prior to  November 1,  1995, Growth  Fund was  named
"Mitchell Hutchins/Kidder, Peabody Small Cap Growth Fund," and prior to February
13,  1995, its name was "Kidder, Peabody  Small Cap Equity Fund." The Trusts are
not required to  (and do  not) hold  annual shareholder  meetings. Neither  Fund
currently issues share certificates.
 
    Shareholders   of  a   Massachusetts  business  trust   may,  under  certain
circumstances, be  held  personally liable  for  its obligations.  However,  the
Declaration   of  Trust  of   each  Trust  expressly   disclaims,  and  provides
indemnification  against,   such  liability.   Accordingly,   the  risk   of   a
shareholder's  incurring financial loss  on account of  shareholder liability is
limited to circumstances  in which a  Fund itself  would be unable  to meet  its
obligations,  a possibility that  Mitchell Hutchins, the  investment adviser and
administrator of each Fund, believes is remote and thus does not pose a material
risk.
 
INVESTMENT OBJECTIVES AND POLICIES
 
    The Funds  have  identical  investment  objectives  and  similar  investment
policies. There can be no assurance that either Fund will achieve its investment
objective,  and each Fund's net asset value fluctuates based upon changes in the
value of its portfolio securities.
 
    VALUE FUND.   The investment objective  of Value Fund  is long-term  capital
appreciation.  Value  Fund  invests  primarily  in  equity  securities  of small
capitalization ("small  cap") companies.  Under  normal conditions,  Value  Fund
invests  at least 65% of its total assets in equity securities, including common
stocks, convertible preferred stocks, convertible debt securities, warrants  and
U.S. dollar-denominated foreign equity securities, including American Depository
Receipts  ("ADRs"), of small cap companies.  "Small cap" companies are companies
that, at the time of purchase, have market capitalizations of up to $1 billion.
 
    Value Fund  may invest  up to  35% of  its total  assets in  common  stocks,
convertible  preferred stocks, convertible debt securities, warrants and ADRs of
companies that are larger than small cap companies as
 
                                       7
<PAGE>
defined  above,   non-convertible   preferred   stocks,   non-convertible   debt
securities, U.S. government securities and high quality money market instruments
such  as U.S. government obligations,  commercial paper, certificates of deposit
and bankers' acceptances.
 
    Value  Fund  may   invest  up   to  25%  of   its  total   assets  in   U.S.
dollar-denominated  equity  securities of  foreign  issuers that  are  traded on
recognized U.S.  exchanges or  in the  U.S. over-the-counter  market,  including
ADRs.  When Mitchell Hutchins believes unusual circumstances warrant a defensive
posture, the Fund temporarily may commit all or a portion of its assets to  cash
or  money market  instruments, including  repurchase agreements.  Value Fund may
borrow money  for  temporary  purposes  and may  engage  in  reverse  repurchase
agreements, but not in excess of 10% of its total assets.
 
    Value  Fund may  invest up to  10% of  its total assets  in debt securities,
including convertible debt securities, rated below investment grade but no lower
than B by Moody's Investors Service, Inc. ("Moody's") or by Standard & Poor's, a
division of The McGraw-Hill Companies, Inc. ("S&P"), comparably rated by another
nationally recognized statistical rating organization ("NRSRO") or, if  unrated,
determined by Mitchell Hutchins to be of comparable quality.
 
    GROWTH  FUND.  Growth Fund's investment  objective is also long-term capital
appreciation. It  seeks to  achieve  this objective  by investing  primarily  in
equity  securities  of  small  cap  companies, which  it  considers  to  be U.S.
companies with stock market capitalizations of up to $1 billion.
 
    In pursuing its objective, Growth Fund invests substantially all, and  under
normal  conditions not less than 65%, of  its assets in common stocks, preferred
stocks,  convertible   bonds,   convertible   debentures,   convertible   notes,
convertible preferred stocks and warrants or rights. To the extent that the Fund
invests in convertible debt securities, those securities will be purchased based
on  their equity characteristics and ratings of  those securities will not be an
important factor in their selection. The equity securities in which Growth  Fund
invests  typically are traded in the over-the-counter market or are non-publicly
traded. Growth  Fund's  investments  in  non-publicly  traded  securities  (also
commonly  referred  to as  "restricted" securities)  may not  exceed 10%  of the
Fund's assets.
 
    Growth Fund may invest up  to 10% of its  assets in foreign securities,  and
may  invest  in ADRs  and European  Depository  Receipts ("EDRs").  Under normal
conditions, less than  10% of Growth  Fund's total  assets may be  held in  cash
and/or invested in money market instruments for cash management purposes. During
periods in which Mitchell Hutchins believes that investment opportunities in the
equity  markets  are  diminished (due  to  either fundamental  changes  in those
markets or an anticipated general decline in the value of equity securities) and
Mitchell  Hutchins  determines  that  the  adoption  of  a  temporary  defensive
investment  posture is therefore warranted, the Fund may hold cash and/or invest
in money market  instruments without  limitation. In addition,  Growth Fund  may
invest  in securities issued  by other registered investment  companies, up to a
maximum of  10%  of its  total  assets. Growth  Fund  may invest  in  repurchase
agreements.
 
    OTHER  POLICIES.    Each  Fund  is  authorized  to  use  hedging strategies,
including options and  futures contracts,  although Growth Fund  has no  current
intention  of engaging in futures contracts  and options on futures contracts in
the foreseeable future. Each  Fund is authorized  to lend up to  33 1/3% of  the
value  of its portfolio securities, and may  engage in short sales of securities
"against the box."  Each Fund also  may invest up  to 15% of  its net assets  in
illiquid  securities, and may  purchase securities on  a when-issued or delayed-
delivery basis.
 
                                       8
<PAGE>
OPERATIONS OF VALUE FUND FOLLOWING THE REORGANIZATION
 
    There are  differences in  the investment  policies of  the Funds.  However,
Mitchell  Hutchins does not expect Value  Fund to revise its investment policies
following the Reorganization to reflect those of Growth Fund. Mitchell  Hutchins
believes  that most,  if not  all, of  the assets  held by  Growth Fund  will be
consistent with  the  investment  policies  of Value  Fund  and  thus  could  be
transferred to and held by Value Fund. If the Reorganization is approved, Growth
Fund  will sell, prior to  the effective time of  the Reorganization, any assets
that are inconsistent with Value Fund's investment policies. The proceeds of any
such sales will be  held in temporary investments  or reinvested in assets  that
qualify  to be held by Value Fund. The  possible need for Growth Fund to dispose
of assets prior  to the  effective time of  the Reorganization  could result  in
selling  securities at a disadvantageous time  and could result in Growth Fund's
realizing losses  that would  not otherwise  have been  realized. Following  the
Reorganization,  the trustees and officers of  Securities Trust and Value Fund's
investment adviser, distributor, exclusive dealer and other outside agents  will
continue to serve Value Fund in their current capacities.
 
PURCHASES
 
    Shares  of each Fund are available through PaineWebber and its correspondent
firms or, for investors who are  not clients of PaineWebber, through PFPC  Inc.,
each Fund's transfer agent ("Transfer Agent"). The minimum investment is $1,000,
and  the minimum for additional purchases is $100. The minimums may be waived or
reduced for  investments  by employees  of  PaineWebber or  its  affiliates,  by
certain  pension plan and retirement accounts and by participants in each Fund's
automatic investment plan. Each Fund and Mitchell Hutchins reserves the right to
reject any purchase order and to suspend  the offering of a Fund's shares for  a
period of time.
 
    Purchases  through PaineWebber investment  executives or correspondent firms
may be made in person or by mail,  by telephone or, for purchases of $1  million
or  more, by wire. PaineWebber investment executives and correspondent firms are
responsible for transmitting  purchase requests to  PaineWebber's New York  City
offices  promptly. Investors may  pay for a  purchase with checks  drawn on U.S.
banks  or  with  funds  held  in  brokerage  accounts  at  PaineWebber  or   its
correspondent firms. Payment is due on the third Business Day after the order is
received  at PaineWebber's New York  City offices. A "Business  Day" is any day,
Monday through Friday, on  which the New York  Stock Exchange, Inc. ("NYSE")  is
open for business.
 
    Each  Fund's Class A shares  normally are sold with  a maximum initial sales
charge of 4.5% of the public offering price. The Value Fund Class A shares  that
will be distributed to shareholders of Growth Fund as part of the Reorganization
will  not  be  subject  to  an  initial  sales  charge.  However,  following the
Reorganization, new purchases of Class A shares of Value Fund will be subject to
an initial sales charge up to 4.5%, and  any Class B, Class C or Class Y  shares
of  Value Fund  that are  purchased by former  Growth Fund  shareholders will be
subject to their respective terms.
 
    Each Fund's Class B shares are sold subject to a maximum contingent deferred
sales charge ("CDSC") of 5% of redemption proceeds, which declines to zero after
six  years.  Class  B   shares  automatically  convert   into  Class  A   shares
approximately six years after purchase.
 
    Class  C shares  of each  Fund currently are  sold without  an initial sales
charge or CDSC but are  subject to higher ongoing  expenses than Class A  shares
and  do not convert to  another Class. For Class C  shares purchased on or after
November 10, 1995, a CDSC of 1%  is imposed on most redemptions made within  one
year of the date of purchase.
 
    Class  Y shares of Value Fund will be issued to holders of Class Y shares in
Growth Fund  in connection  with the  Reorganization. No  initial or  contingent
deferred    sales   charge   is   imposed   on   Class   Y   shares,   nor   are
 
                                       9
<PAGE>
Class Y shares  subject to Rule  12b-1 distribution or  service fees.  Effective
after  the Closing Date, Class  Y shares of Value Fund  will also be offered for
sale to participants in INSIGHT  and certain other investment advisory  programs
that  are sponsored  by PaineWebber  and that  may invest  in PaineWebber mutual
funds. Value Fund Class Y shares will  be sold to eligible investors at the  net
asset value next determined after the purchase order is received.
 
    INSIGHT.    An investor  who  purchases $50,000  or  more of  shares  of the
PaineWebber mutual  funds  that  are  in the  Flexible  Pricing  System-SM-  may
participate  in INSIGHT, a total portfolio asset allocation program sponsored by
PaineWebber, and thus become eligible to purchase Value Fund Class Y shares  and
Class  Y shares of other PaineWebber  mutual funds. INSIGHT offers comprehensive
investment  services,  including  a  personalized  asset  allocation  investment
strategy  using  an appropriate  combination  of funds,  professional investment
advice regarding investment among the funds by portfolio specialists, monitoring
of investment performance and comprehensive quarterly reports that cover  market
trends,  portfolio summaries and personalized account information. Participation
in INSIGHT  is subject  to payment  of an  advisory fee  to PaineWebber  at  the
maximum  annual  rate of  1.5%  of assets  held  through the  program (generally
charged quarterly  in  advance), which  covers  all INSIGHT  program  investment
advisory  services and program administration fees. Employees of PaineWebber and
its affiliates are entitled to a 50% reduction in the fee otherwise payable  for
participation  in INSIGHT. INSIGHT clients may  elect to have their INSIGHT fees
charged to  their PaineWebber  accounts (by  the automatic  redemption of  money
market  fund  shares)  or  another  of  their  PaineWebber  accounts  or  billed
separately.
 
REDEMPTIONS
 
    Shareholders of each Fund may submit redemption requests to their investment
executives or correspondent firms  in person or by  telephone, mail or wire.  As
each  Fund's agent, PaineWebber  may honor a  redemption request by repurchasing
shares from  a  redeeming  shareholder  at the  shares'  net  asset  value  next
determined  after receipt of the request by PaineWebber's New York City offices.
Within three Business  Days after  receipt of the  request, repurchase  proceeds
(less   any  applicable  CDSC)  will  be  paid  by  check  or  credited  to  the
shareholder's brokerage account at the election of the shareholder.  PaineWebber
investment  executives  and  correspondent firms  are  responsible  for promptly
forwarding redemption requests to PaineWebber's New York City offices.
 
    PaineWebber reserves the right not to honor any redemption request, in which
case PaineWebber promptly  will forward the  request to the  Transfer Agent  for
treatment as described below.
 
    Shareholders of each Fund also may redeem shares through the Transfer Agent.
Shareholders  should mail  redemption requests  directly to  the Transfer Agent:
PFPC Inc., Attn: PaineWebber Mutual  Funds, P.O. Box 8950, Wilmington,  Delaware
19899.  A  redemption request  will  be executed  at  the net  asset  value next
computed after it is received in  "good order," and redemption proceeds will  be
paid  within seven days of  the receipt of the  request. "Good order" means that
the request must be accompanied by the following: (1) a letter of instruction or
a stock assignment specifying the number of shares or amount of investment to be
redeemed (or that all shares credited  to the Fund account be redeemed),  signed
by  all registered  owners of the  shares in the  exact names in  which they are
registered, (2) a  guarantee of  the signature of  each registered  owner by  an
eligible institution acceptable to the Transfer Agent and in accordance with SEC
rules,  such as a commercial bank, trust company or member of a recognized stock
exchange,  (3)   other  supporting   legal   documents  for   estates,   trusts,
guardianships,  custodianships,  partnerships  and  corporations  and  (4)  duly
endorsed share certificates, if any.  Shareholders are responsible for  ensuring
that a request for redemption is received in "good order."
 
                                       10
<PAGE>
    A  shareholder may have redemption  proceeds of $1 million  or more wired to
the shareholder's PaineWebber  brokerage account  or a  commercial bank  account
designated  by  the  shareholder.  Questions about  this  option,  or redemption
requirements generally,  should be  referred  to the  shareholder's  PaineWebber
investment  executive or  correspondent firm,  or to  the Transfer  Agent if the
shares are  not  held in  a  PaineWebber  brokerage account.  If  a  shareholder
requests  redemption of shares which were purchased recently, the Fund may delay
payment until it is assured that good payment has been received. In the case  of
purchases by check, this can take up to 15 days.
 
    Because  the  Funds incur  certain  fixed costs  in  maintaining shareholder
accounts, each  Fund  reserves  the right  to  redeem  all Fund  shares  in  any
shareholder  account having a  net asset value  below the lesser  of $500 or the
current minimum for initial  purchasers. If the  Fund elects to  do so, it  will
notify  the shareholder and provide the  shareholder the opportunity to increase
the amount invested to the minimum required level or more within 60 days of  the
notice.  The Fund will not redeem accounts  that fall below the minimum required
level solely as a result of a reduction in net asset value per share.
 
    If the Reorganization is  approved, shares of Growth  Fund will cease to  be
offered  on July  22, 1996,  so that  shares of  Growth Fund  will no  longer be
available for purchase or exchange starting on July 23, 1996 (the next  Business
Day).  If the Meeting is adjourned and the Reorganization is approved on a later
date, Growth Fund shares will no longer be available for purchase or exchange on
the Business Day following the date on which the Reorganization is approved  and
all  contingencies  have  been  met. Redemptions  of  Growth  Fund's  shares and
exchanges of such shares for shares of any other PaineWebber mutual fund may  be
effected through the Closing Date.
 
EXCHANGES
 
    Class A, Class B and Class C shares of each Fund may be exchanged for shares
of  the corresponding Class of  most other PaineWebber mutual  funds, and may be
acquired through  an exchange  of shares  of the  corresponding Class  of  other
PaineWebber  mutual funds,  as provided  in each  Fund's prospectus.  No initial
sales charge is imposed on the shares being acquired, and no CDSC is imposed  on
the  shares being disposed of, through an  exchange. However, CDSCs may apply to
redemptions of shares acquired  through an exchange. As  noted above, the  $5.00
exchange  fee is charged for each exchange of shares of Value Fund for shares of
other PaineWebber mutual  funds and will  continue to be  imposed following  the
Reorganization. Class Y shares of each Fund have no exchange privileges.
 
DIVIDENDS AND OTHER DISTRIBUTIONS
 
    Value  Fund pays an annual  dividend from its net  investment income and net
short-term capital gain, if any. The Fund also distributes substantially all  of
its  net  capital  gain (the  excess  of  net long-term  capital  gain  over net
short-term capital loss) with  the regular annual  dividend. Dividends from  net
investment  income and  distributions of  net realized  capital gains  of Growth
Fund,  if  any,  are  distributed  annually.  Each  Fund  may  make   additional
distributions  if necessary  to avoid a  4% excise tax  on certain undistributed
income and capital gain.
 
    Each Fund's dividends and other distributions are paid in additional  shares
of  the applicable Class at net asset value unless the shareholder has requested
cash  payments.  Shareholders  who  wish  to  receive  dividends  and/or   other
distributions  in cash, either mailed to the shareholder by check or credited to
the  shareholder's  PaineWebber  account,   should  contact  their   PaineWebber
investment executives or correspondent firms.
 
                                       11
<PAGE>
    On  or before the Closing  Date, Growth Fund will  declare as a distribution
substantially all  of  its net  investment  income,  net capital  gain  and  net
short-term  capital gain in  order to continue  to maintain its  tax status as a
regulated investment company. On or before the Closing Date, Value Fund also may
declare and  distribute  as  a  dividend substantially  all  of  any  previously
undistributed net investment income.
 
FEDERAL INCOME TAX CONSEQUENCES OF THE REORGANIZATION
 
    Each  Trust  has received  an  opinion of  Kirkpatrick  & Lockhart  LLP, its
counsel, to  the  effect that  the  Reorganization will  constitute  a  tax-free
reorganization  within  the  meaning  of section  368(a)(1)(C)  of  the Internal
Revenue Code of 1986, as amended ("Code"). Accordingly, no gain or loss will  be
recognized to either Fund or its shareholders as a result of the Reorganization.
See "The Proposed Transaction -- Federal Income Tax Considerations."
 
                      COMPARISON OF PRINCIPAL RISK FACTORS
 
    Since the investment policies of each Fund are similar, the investment risks
presented  by the two  Funds are also  similar. These risks  are those typically
associated with  a small  cap equity  fund. Certain  differences are  identified
below.  See the  Value Fund  Prospectus for  a more  detailed discussion  of the
investment risks of Value Fund,  and see the Growth  Fund Prospectus for a  more
detailed discussion of the investment risks of Growth Fund.
 
    SMALL  CAP COMPANIES.  Each Fund invests  in small cap companies, which each
Fund considers to be companies  that at the time  of purchase have stock  market
capitalizations  of up to $1 billion. Small cap companies may be more vulnerable
than larger companies to  adverse business or  economic developments. Small  cap
companies  may also have limited product  lines, markets or financial resources,
and may be dependent on a relatively small management group. Securities of  such
companies  may  be  less liquid  and  more  volatile than  securities  of larger
companies or the market  averages in general and  therefore may involve  greater
risk  than investing in  larger companies. In addition,  small cap companies may
not be well-known to the investing public, may not have institutional  ownership
and may have only cyclical, static or moderate growth prospects.
 
    FOREIGN  SECURITIES.  Each Fund may invest in foreign securities. Value Fund
may invest up to 25% of its  total assets in the U.S. dollar-denominated  equity
securities  of foreign issuers, including ADRs. Growth Fund may invest up to 10%
of its  assets in  foreign securities,  and  may also  invest in  securities  of
foreign  issuers in the form of ADRs and EDRs. Investments in foreign securities
involve special risks,  arising both  from political  and economic  developments
abroad  and  differences between  foreign and  U.S. regulatory  systems. Foreign
economies may differ favorably or unfavorably  from the U.S. economy in  various
respects,  and many foreign securities may be  less liquid and their prices more
volatile than comparable U.S. securities.
 
    CURRENCY  EXCHANGE   RATES.      Growth  Fund   may   invest   in   non-U.S.
dollar-denominated  foreign  securities.  The  Fund's  share  value  may  change
significantly when the  currencies, other  than the  U.S. dollar,  in which  the
Fund's  portfolio investments are  denominated strengthen or  weaken against the
U.S. dollar. Currency exchange rates generally  are determined by the forces  of
supply  and demand in  the foreign exchange  markets and the  relative merits of
investments in different  countries as seen  from an international  perspective.
Currency  exchange rates can also be  affected unpredictably by the intervention
of the U.S. government, foreign governments or central banks, the imposition  of
currency  controls,  or other  political developments  in  the United  States or
abroad.
 
                                       12
<PAGE>
    LENDING  PORTFOLIO SECURITIES.  Each Fund  may lend its portfolio securities
to qualified  broker-dealers  or  institutional  investors.  Lending  securities
enables a Fund to earn additional income, but could result in a loss or delay in
recovering these securities.
 
    HEDGING  STRATEGIES.   Each Fund  is authorized  to use  hedging strategies,
including options and  futures contracts,  although Growth Fund  has no  current
intention  of engaging in futures contracts  and options on futures contracts in
the foreseeable future. There  can be no assurance  that any strategy used  will
succeed.  If Mitchell  Hutchins is incorrect  in its judgment  on market values,
interest rates or other economic factors in using a hedging strategy, a Fund may
have lower net income and a net loss on the investment. Each of these strategies
involves certain risks, which include (1) the fact that the skills needed to use
hedging instruments are different from those needed to select securities for the
Funds; (2) the  possibility of  imperfect correlation, or  even no  correlation,
between  price  movements  of hedging  instruments  and price  movements  of the
securities being hedged; (3) possible constraints placed on a Fund's ability  to
purchase or sell portfolio investments at advantageous times due to the need for
the Fund to maintain "cover" or to segregate securities; and (4) the possibility
that a Fund is unable to close out or liquidate its hedged position.
 
                            THE PROPOSED TRANSACTION
 
REORGANIZATION PLAN
 
    The  terms  and  conditions  under which  the  proposed  transaction  may be
consummated are set forth in the Reorganization Plan. Significant provisions  of
the Reorganization Plan are summarized below; however, this summary is qualified
in  its entirety by reference  to the Reorganization Plan,  which is attached as
Appendix A to this Proxy Statement.
 
    The Reorganization  Plan contemplates:  (a) Value  Fund's acquiring  on  the
Closing  Date the assets of Growth Fund in exchange solely for Value Fund shares
and the  assumption by  Value Fund  of Growth  Fund's liabilities,  and (b)  the
constructive  distribution of  Value Fund shares  to the  shareholders of Growth
Fund, by Class.
 
    The assets of Growth  Fund to be  acquired by Value  Fund include all  cash,
cash  equivalents, securities,  receivables and  other property  owned by Growth
Fund.  Value  Fund  will  assume  from  Growth  Fund  all  debts,   liabilities,
obligations  and duties  of Growth  Fund of  whatever kind  or nature; provided,
however, that Growth Fund will use its best efforts, to the extent  practicable,
to  discharge all of its known  debts, liabilities, obligations and duties prior
to the Closing Date. Value Fund also will deliver to Growth Fund shares of Value
Fund,  which  then   will  be  constructively   distributed  to  Growth   Fund's
shareholders.
 
    The  value of  Growth Fund's assets  to be  acquired, and the  amount of its
liabilities to be assumed, by Value Fund and  the net asset value of a Class  A,
Class  B, Class C and Class  Y share of Value Fund  will be determined as of the
close of  regular  trading  on  the  NYSE on  the  Closing  Date.  Where  market
quotations are readily available, portfolio securities will be valued based upon
such market quotations, provided such quotations adequately reflect, in Mitchell
Hutchins' judgment, the fair value of the security. Where such market quotations
are  not readily available, such securities will be valued based upon appraisals
received from a pricing service using a computerized matrix system or based upon
appraisals  derived  from  information   concerning  the  security  or   similar
securities  received from recognized dealers  in those securities. The amortized
cost method of valuation generally will  be used to value debt instruments  with
60  days  or less  remaining  to maturity,  unless  Investment Trust's  board of
trustees (with respect to Growth Fund) or
 
                                       13
<PAGE>
Securities Trust's board  of trustees  (with respect to  Value Fund)  determines
that this does not represent fair value. All other securities and assets will be
valued  at fair value as  determined in good faith by  or under the direction of
each Trust's board of trustees, as applicable.
 
    On, or as  soon as  practicable after, the  Closing Date,  Growth Fund  will
distribute  to its shareholders of record the  shares of Value Fund it received,
by Class, so that each shareholder of Growth Fund will receive a number of  full
and fractional shares of the corresponding Class of Value Fund equal in value to
the  shareholder's holdings  in Growth Fund;  Growth Fund will  be terminated as
soon as  practicable  thereafter.  Such distribution  will  be  accomplished  by
opening  accounts  on  the books  of  Value Fund  in  the names  of  Growth Fund
shareholders and by  transferring thereto  the shares of  each Class  previously
credited to the account of Growth Fund on those books. Fractional shares in each
corresponding Class of Value Fund will be rounded to the third decimal place.
 
    Accordingly,  immediately after the  Reorganization, each former shareholder
of Growth Fund will own  shares of the Class of  Value Fund that will equal  the
value  of that  shareholder's shares in  the corresponding Class  of Growth Fund
immediately prior to the Reorganization. Moreover, because shares of each  Class
of  Value Fund will be issued at net  asset value in exchange for the net assets
applicable to the corresponding  Class of Growth Fund,  the aggregate net  asset
value  of shares of each Class of Value  Fund so issued will equal the aggregate
net asset value of the shares of the corresponding Class of Growth Fund. The net
asset value per share of Value Fund will be unchanged by the transactions. Thus,
the Reorganization will not result in a dilution of any shareholder interest.
 
    Any transfer taxes payable upon issuance of  shares of Value Fund in a  name
other  than that of the  registered holder of the shares  on the books of Growth
Fund shall be  paid by the  person to  whom such shares  are to be  issued as  a
condition  of such  transfer. Any reporting  responsibility of  Growth Fund will
continue to be its responsibility up to and including the Closing Date and  such
later date on which Growth Fund is terminated.
 
    The  cost of the Reorganization, including professional fees and the cost of
soliciting proxies  for  the Meeting,  consisting  principally of  printing  and
mailing expenses, together with the cost of any supplementary solicitation, will
be  borne by both Funds  in proportion to their  respective net assets. Mitchell
Hutchins recommended this method  of expense allocation to  the trustees of  the
Trusts.  Mitchell  Hutchins based  its recommendations  on  its belief  that the
method is  fair  because, for  the  reasons  discussed under  "Reasons  for  the
Reorganization,"  the transaction has  the potential to  benefit both Funds. The
trustees of each Trust considered the expense allocation method in approving the
Reorganization and in finding that the  Reorganization is in the best  interests
of each Fund.
 
    The  consummation of the Reorganization is subject to a number of conditions
set forth in the Reorganization Plan, some of which may be waived by each Trust.
In addition, the Reorganization  Plan may be amended  in any mutually  agreeable
manner,  except that no amendment may be made subsequent to the Meeting that has
a material adverse effect on the shareholders' interests.
 
REASONS FOR THE REORGANIZATION
 
    Investment  Trust's  board  of  trustees,   including  a  majority  of   its
Independent  Trustees, has  determined that  the Reorganization  is in  the best
interests of Growth  Fund, that  the terms of  the Reorganization  are fair  and
reasonable,  and that the interests of the  shareholders of Growth Fund will not
be diluted  as a  result  of the  Reorganization.  Securities Trust's  board  of
trustees,    including   a   majority   of   its   Independent   Trustees,   has
 
                                       14
<PAGE>
determined that the Reorganization is in the best interests of Value Fund,  that
the  terms of the Reorganization are fair and reasonable, and that the interests
of the  shareholders of  Value Fund  will  not be  diluted as  a result  of  the
Reorganization.
 
    In  considering the Reorganization, the boards of trustees made an extensive
inquiry into a number of factors, including the following:
 
    (1)  the   compatibility  of   the  investment   objectives,  policies   and
    restrictions of the Funds;
 
    (2)  the effect of the Reorganization on the expected investment performance
    of the Funds;
 
    (3) the effect  of the  Reorganization on the  expense ratio  of Value  Fund
    (after the Reorganization) relative to each Fund's current expense ratio;
 
    (4) the costs to be incurred by each Fund as a result of the Reorganization;
 
    (5) the tax consequences of the Reorganization;
 
    (6)  possible alternatives  to the  Reorganization, including  continuing to
    operate on a stand-alone basis or liquidation; and
 
    (7) potential benefits  of the Reorganization  to other persons,  especially
    Mitchell Hutchins and PaineWebber.
 
    The  Reorganization was  recommended to  the Trusts'  boards of  trustees by
Mitchell Hutchins at meetings  thereof held on April  18, 1996. In  recommending
the  Reorganization,  Mitchell Hutchins  advised  the boards  of  trustees that,
following the Reorganization, the  total operating expenses  as a percentage  of
net  assets of the combined fund would be lower than they are for each Fund on a
stand-alone basis. Combining the two Funds would eliminate duplicative  expenses
and  achieve other  economies of  scale in  connection with  custody fees, state
registration  fees,  printing  expenses,  trustees  fees  and  legal  and  audit
expenses.  Mitchell Hutchins believes  there is no  reason to continue operating
two similar small cap funds with identical investment objectives.
 
    In approving the Reorganization,  the boards of  trustees took into  account
the  fact  that  the  Funds' investment  objectives  are  identical,  that their
investment policies are  similar, and  that Mitchell Hutchins  did not  consider
there to be a need to offer both Funds to investors. The boards recognized that,
as  the larger  of the  two Funds, Value  Fund was  the logical  survivor in any
combination. In  considering the  proposed transaction,  the boards  noted  that
Value  Fund's  overall objective  of long-term  capital appreciation  remains an
appropriate one to offer to investors as part of an overall investment strategy.
 
                   THE BOARD OF TRUSTEES RECOMMENDS THAT THE
                   SHAREHOLDERS OF GROWTH FUND VOTE "FOR" THE
                                REORGANIZATION.
 
DESCRIPTION OF SECURITIES TO BE ISSUED
 
    Securities Trust  is  registered with  the  SEC as  an  open-end  management
investment  company. Its trustees are authorized to issue an unlimited number of
shares of beneficial interest  of separate series (par  value $.001 per  share).
The trustees have established Value Fund as one of Securities Trust's two series
and have authorized the public offering of four Classes of shares of Value Fund.
A  separate filing will be made for the purpose of registering Class Y shares of
Value  Fund   with   the   SEC.   Each  share   in   a   Class   represents   an
 
                                       15
<PAGE>
equal  proportionate interest in Value Fund with each other share in that Class.
Shares of  Value Fund  entitle their  holders to  one vote  per full  share  and
fractional  votes for fractional  shares held, except that  each Class of shares
has exclusive voting rights on matters  pertaining to its plan of  distribution,
if any.
 
    On  the  Closing Date,  Value  Fund will  have  outstanding four  Classes of
shares, designated as Class A, Class B,  Class C and Class Y shares. Each  Class
represents  interests in  the same  assets of  the Fund.  The Classes  differ as
follows: (1) Class A, Class  B and Class C shares,  unlike Class Y shares,  bear
certain  fees under  plans of distribution  and have exclusive  voting rights on
matters pertaining to those plans; (2) Class A shares are subject to an  initial
sales  charge; (3) Class B shares bear ongoing distribution fees, are subject to
a CDSC upon  certain redemptions  and automatically  convert to  Class A  shares
approximately  six  years  after  issuance;  (4)  Class  C  shares  bear ongoing
distribution fees, are  subject to a  CDSC upon certain  redemptions and do  not
convert  into another Class;  (5) Class Y  shares will be  subject to neither an
initial sales charge or a CDSC nor ongoing service or distribution fees; and (6)
each Class may bear differing  amounts of certain Class-specific expenses.  Each
share  of  each  Class of  Value  Fund  is entitled  to  participate  equally in
dividends and other distributions  and the proceeds  of any liquidation,  except
that,  because of the  higher expenses resulting  from the distribution expenses
borne by Class B and Class C  shares, dividends on these shares are expected  to
be  lower  than those  on  Class A  and  Class Y  shares;  for the  same reason,
dividends on Class  B shares  are expected  to be lower  than those  on Class  C
shares.  Dividends  on each  Class  also might  be  affected differently  by the
allocation of other Class-specific expenses.
 
    Securities Trust does not hold  annual meetings of shareholders. There  will
normally  be no  meetings of shareholders  for the purpose  of electing trustees
unless fewer than a majority of the trustees holding office has been elected  by
shareholders,   at  which  time  the  trustees   then  in  office  will  call  a
shareholders' meeting  for  the  election  of  trustees.  Under  the  1940  Act,
shareholders  of record of at  least two-thirds of the  outstanding shares of an
investment company may remove a trustee by votes cast in person or by proxy at a
meeting called for that purpose. The trustees are required to call a meeting  of
shareholders  for the  purpose of  voting upon  the question  of removal  of any
trustee when requested in writing to do so by the shareholders of record holding
at least 10% of Securities Trust's outstanding shares.
 
FEDERAL INCOME TAX CONSIDERATIONS
 
    The exchange of Growth Fund's assets for Value Fund shares and Value  Fund's
assumption  of  Growth Fund's  liabilities is  intended  to qualify  for federal
income tax purposes as a  tax-free reorganization under section 368(a)(1)(C)  of
the  Code. Each Trust has received an opinion of Kirkpatrick & Lockhart LLP, its
counsel, substantially to the effect that:
 
    (1) Value Fund's acquisition of Growth Fund's assets in exchange solely  for
    Value  Fund shares and Value Fund's assumption of Growth Fund's liabilities,
    followed by Growth Fund's distribution  of those shares to its  shareholders
    constructively  in exchange for their Growth  Fund shares, will constitute a
    "reorganization" within the meaning of section 368(a)(1)(C) of the Code, and
    each Fund  will be  "a party  to  a reorganization"  within the  meaning  of
    section 368(b) of the Code;
 
    (2)  No gain or  loss will be recognized  to Growth Fund  on the transfer to
    Value Fund of its assets in exchange solely for Value Fund shares and  Value
    Fund's  assumption  of  Growth  Fund's  liabilities  or  on  the  subsequent
    distribution of those shares to  Growth Fund's shareholders in  constructive
    exchange for their Growth Fund shares;
 
                                       16
<PAGE>
    (3)  No gain or loss will be recognized  to Value Fund on its receipt of the
    transferred assets  in  exchange  solely  for  Value  Fund  shares  and  its
    assumption of Growth Fund's liabilities;
 
    (4)  Value Fund's basis for  the transferred assets will  be the same as the
    basis  thereof   in   Growth  Fund's   hands   immediately  prior   to   the
    Reorganization,  and  Value  Fund's  holding period  for  those  assets will
    include Growth Fund's holding period therefor;
 
    (5) A  Growth  Fund  shareholder will  recognize  no  gain or  loss  on  the
    constructive  exchange of all  its Growth Fund shares  solely for Value Fund
    shares pursuant to the Reorganization; and
 
    (6) A  Growth Fund  shareholder's basis  for  the Value  Fund shares  to  be
    received  by it in the Reorganization will be  the same as the basis for its
    Growth Fund shares to  be constructively surrendered  in exchange for  those
    Value  Fund shares, and its holding period  for those Value Fund shares will
    include its holding period for those  Growth Fund shares, provided they  are
    held as capital assets by the shareholder on the Closing Date.
 
Such  opinion may  state that no  opinion is expressed  as to the  effect of the
Reorganization on the Funds or any shareholder  with respect to any asset as  to
which  any unrealized  gain or  loss is  required to  be recognized  for federal
income tax purposes  at the  end of  a taxable year  (or on  the termination  or
transfer thereof) under a mark-to-market system of accounting.
 
    Shareholders  of Growth Fund should consult their tax advisers regarding the
effect,  if  any,   of  the   Reorganization  in  light   of  their   individual
circumstances.  Because  the foregoing  discussion only  relates to  the federal
income tax consequences  of the Reorganization,  those shareholders also  should
consult  their tax advisers as  to state and local  tax consequences, if any, of
the Reorganization.
 
CAPITALIZATION
 
    The following table  shows the capitalization  of each Fund  at January  31,
1996  (unaudited) and on a pro forma  combined basis (unaudited) as of that date
giving effect to the Reorganization:
 
<TABLE>
<CAPTION>
                                                                          Pro Forma
                                               Value Fund   Growth Fund   Combined
                                               -----------  ------------  ----------
<S>                                            <C>          <C>           <C>
Net Assets
  Class A....................................  1$9,639,810   $23,872,388  $43,512,198
  Class B....................................  4$0,875,625   $   26,478   $40,902,103
  Class C....................................  1$1,603,025   $11,783,151  $23,386,176
  Class Y....................................         N/A    $4,568,558   $4,568,558
 
Net Asset Value Per Share
  Class A....................................      $10.72        $12.77       $10.72
  Class B....................................      $10.53        $12.56       $10.53
  Class C....................................      $10.52        $12.56       $10.52
  Class Y....................................         N/A        $12.84       $10.52
 
Shares Outstanding
  Class A....................................   1,831,614     1,869,078    4,058,118
  Class B....................................   3,881,699         2,108    3,884,213
  Class C....................................   1,102,701       938,350    2,223,012
  Class Y....................................         N/A       355,798      434,263
</TABLE>
 
                                       17
<PAGE>
                                 MISCELLANEOUS
 
AVAILABLE INFORMATION
 
    Each Trust is subject  to the informational  requirements of the  Securities
Exchange Act of 1934 and the 1940 Act and in accordance therewith files reports,
proxy  material and other information with the SEC. Such reports, proxy material
and other  information can  be  inspected and  copied  at the  Public  Reference
Facilities  maintained by  the SEC at  450 Fifth Street,  N.W., Washington, D.C.
20549, the Midwest Regional Office of the SEC, Northwest Atrium Center, 500 West
Madison Street, Suite 400, Chicago,  Illinois 60611, and the Northeast  Regional
Office  of the  SEC, Seven World  Trade Center,  Suite 1300, New  York, New York
10048. Copies of such  material can also be  obtained from the Public  Reference
Branch,  Office  of Consumer  Affairs and  Information Services,  Securities and
Exchange Commission, Washington, D.C. 20459 at prescribed rates.
 
LEGAL MATTERS
 
    Certain legal matters in connection with  the issuance of Value Fund  shares
as part of the Reorganization will be passed upon by Kirkpatrick & Lockhart LLP,
counsel to the Trusts.
 
EXPERTS
 
    The audited financial statements of Value Fund and Growth Fund, incorporated
by  reference herein  or in the  Statement of Additional  Information, have been
audited by Price Waterhouse LLP and  Ernst & Young LLP, independent  accountants
and  auditors,  to the  extent  indicated in  their  reports thereon,  which are
included in the Funds' Annual Reports to Shareholders for the fiscal years ended
July 31, 1995. The financial statements of  Growth Fund for the year ended  July
31,  1995, insofar as they relate to the  statement of changes in net assets for
the year ended July 31, 1994 and financial highlights for the period then ended,
were audited  by Deloitte  &  Touche LLP,  independent auditors.  The  financial
statements  audited by Price  Waterhouse LLP, Ernst  & Young LLP  and Deloitte &
Touche LLP have  been incorporated by  reference herein or  in the Statement  of
Additional  Information in reliance on their reports given on their authority as
experts in auditing and accounting.
 
                                       18
<PAGE>
                                   APPENDIX A
              AGREEMENT AND PLAN OF REORGANIZATION AND TERMINATION
 
    THIS  AGREEMENT AND PLAN OF  REORGANIZATION AND TERMINATION ("Agreement") is
made as of April 24, 1996, between PaineWebber Securities Trust, a Massachusetts
business trust ("Securities Trust"),  on behalf of  PaineWebber Small Cap  Value
Fund,  a segregated portfolio  of assets ("series")  thereof ("Acquiring Fund"),
and  PaineWebber   Investment  Trust   III,  a   Massachusetts  business   trust
("Investment  Trust"), on behalf of its PaineWebber Small Cap Growth Fund series
("Target").  (Acquiring  Fund  and  Target  are  sometimes  referred  to  herein
individually  as a "Fund" and collectively  as the "Funds," and Securities Trust
and Investment  Trust  are  sometimes  referred to  herein  individually  as  an
"Investment Company" and collectively as the "Investment Companies.")
 
    This  Agreement  is  intended  to  be,  and  is  adopted  as,  a  plan  of a
reorganization described in section 368(a)(1)(C) of the Internal Revenue Code of
1986, as  amended ("Code").  The  reorganization will  involve the  transfer  to
Acquiring  Fund  of Target's  assets  solely in  exchange  for voting  shares of
beneficial  interest  in  Acquiring  Fund  ("Acquiring  Fund  Shares")  and  the
assumption   by  Acquiring  Fund  of   Target's  liabilities,  followed  by  the
constructive distribution of the Acquiring Fund Shares to the holders of  shares
of  beneficial interest  in Target ("Target  Shares") in  exchange therefor, all
upon the terms and conditions set  forth herein. The foregoing transactions  are
referred  to herein  as the  "Reorganization." All  agreements, representations,
actions, and obligations described herein made  or to be taken or undertaken  by
either  Fund are made  and shall be  taken or undertaken  by Securities Trust on
behalf of Acquiring Fund and by Investment Trust on behalf of Target.
 
    Acquiring Fund's shares currently are divided into three classes, designated
Class A, Class B, and Class C shares ("Class A Acquiring Fund Shares," "Class  B
Acquiring  Fund Shares,"  and "Class  C Acquiring  Fund Shares," re-spectively).
Acquiring Fund also  has authorized, and  by the Effective  Time (as defined  in
paragraph 3.1) will issue for sale, a fourth class of shares, designated Class Y
shares  ("Class  Y Acquiring  Fund Shares").  Except as  noted in  the following
sentence, these classes differ only with respect to the sales charges imposed on
the purchase  of  shares and  the  fees ("12b-1  fees")  payable by  each  class
pursuant  to plans  adopted under  Rule 12b-1  promulgated under  the Investment
Company Act of 1940, as amended ("1940 Act"), as follows:
 
        (1) Class A Acquiring Fund Shares are offered at net asset value ("NAV")
    plus a front-end  sales charge ("FESC")  (if applicable), are  subject to  a
    12b-1  service fee  at the  annual rate  of 0.25%  of the  average daily net
    assets attributable to the class  ("average class assets"), and are  subject
    to  a 1%  contingent deferred sales  charge ("CDSC") on  most redemptions of
    shares purchased within one year before the redemption;
 
        (2) Class B Acquiring Fund Shares are offered at NAV without  imposition
    of  any FESC and are sub-ject  to a CDSC of up  to 5% of redemption proceeds
    and 12b-1 service and  distribution fees at the  respective annual rates  of
    0.25% and 0.75% of average class assets;
 
        (3)  Class C Acquiring Fund Shares are offered at NAV without imposition
    of any  FESC, are  subject to  12b-1 service  and distribution  fees at  the
    respective annual rates of 0.25% and 0.50% of average class assets, and (for
    shares  purchased on or after November 10, 1995) are subject to a 1% CDSC on
    most redemptions of shares purchased within one year before the  redemption;
    and
 
                                      A-1
<PAGE>
        (4)  Class Y Acquiring Fund Shares will be offered to a limited class of
    offerees at NAV without imposition  of any FESC and  will not be subject  to
    any 12b-1 fee.
 
These classes also may differ from one another with respect to the allocation of
certain class-specific expenses other than 12b-1 fees.
 
    Target's  shares also  are divided  into four  classes, designated  Class A,
Class B, Class C, and Class Y  shares ("Class A Target Shares," "Class B  Target
Shares,"  "Class C Target  Shares," and "Class  Y Target Shares," respectively).
These classes  are  identical  to  the  correspondingly  designated  classes  of
Acquiring Fund Shares.
 
    In  consideration of  the mutual promises  herein, the  parties covenant and
agree as follows:
 
1.  PLAN OF REORGANIZATION AND TERMINATION OF TARGET
 
    1.1.  Target agrees  to assign, sell, convey,  transfer, and deliver all  of
its  assets described in  paragraph 1.2 ("Assets")  to Acquiring Fund. Acquiring
Fund agrees in exchange therefor --
 
        (a) to issue and deliver to Target the number of full and fractional (i)
    Class A Acquiring Fund Shares determined by dividing the net value of Target
    (computed as set forth  in paragraph 2.1)  ("Target Value") attributable  to
    the  Class A Target  Shares by the  NAV (computed as  set forth in paragraph
    2.2) of a Class A Acquiring Fund  Share, (ii) Class B Acquiring Fund  Shares
    determined  by dividing the Target Value attribut-able to the Class B Target
    Shares by the NAV (as so computed) of a Class B Acquiring Fund Share,  (iii)
    Class  C  Acquiring  Fund Shares  determined  by dividing  the  Target Value
    attributable to the Class C Target Shares  by the NAV (as so computed) of  a
    Class  C  Acquiring  Fund Share,  and  (iv)  Class Y  Acquiring  Fund Shares
    determined by dividing the Target Value  attributable to the Class Y  Target
    Shares by the NAV (as so computed) of a Class Y Acquiring Fund Share; and
 
        (b)  to assume  all of Target's  liabilities described  in paragraph 1.3
    ("Liabilities").
 
Such transactions shall take place at the Closing (as defined in paragraph 3.1).
 
    1.2.    The  Assets  shall  include,  without  limitation,  all  cash,  cash
equivalents,   securities,   receivables  (including   interest   and  dividends
receivable), claims  and  rights of  action,  rights to  register  shares  under
applicable  securities laws,  books and  records, deferred  and prepaid expenses
shown as assets on  Target's books, and  other property owned  by Target at  the
Effective Time.
 
    1.3.   The Liabilities  shall include (except  as otherwise provided herein)
all of Target's liabilities, debts, obligations, and duties of whatever kind  or
nature,  whether  absolute, accrued,  contingent, or  otherwise, whether  or not
arising in the ordinary course of  business, whether or not determinable at  the
Effective  Time, and whether or not  specifically referred to in this Agreement,
including without  limitation  Target's  share  of  the  expenses  described  in
paragraph  7.2. Notwithstanding  the foregoing,  Target agrees  to use  its best
efforts to discharge all of its known Liabilities prior to the Effective Time.
 
    1.4.  At or immediately before the Effective Time, Target shall declare  and
pay  to its shareholders a dividend and/or other distribution in an amount large
enough so that it will have distributed substantially all (and in any event  not
less than 90%) of its investment company taxable income (computed without regard
to  any deduction for dividends paid) and  substantially all of its realized net
capital gain, if any, for the current taxable year through the Effective Time.
 
                                      A-2
<PAGE>
    1.5.   At  the  Effective Time  (or  as  soon thereafter  as  is  reasonably
practicable),  Target shall constructively distribute  the Acquiring Fund Shares
received by it  pursuant to paragraph  1.1 to Target's  shareholders of  record,
determined   as  of   the  Effective   Time  (collectively   "Shareholders"  and
individually a  "Shareholder"),  in  exchange  for  their  Target  Shares.  Such
distribution  shall  be accomplished  by  the Funds'  transfer  agent ("Transfer
Agent") opening  accounts  on  Acquiring  Fund's share  transfer  books  in  the
Shareholders'  names and transferring  such Acquiring Fund  Shares thereto. Each
Shareholder's account shall be credited with  the respective PRO RATA number  of
full  and fractional (rounded to the  third decimal place) Acquiring Fund Shares
due that Shareholder, by class (I.E., the  account for a Shareholder of Class  A
Target  Shares shall be credited with the  respective PRO RATA number of Class A
Acquiring Fund Shares  due that Shareholder,  the account for  a Shareholder  of
Class  B Target Shares shall be credited  with the respective PRO RATA number of
Class  B  Acquiring  Fund  Shares  due  that  Shareholder,  the  account  for  a
Shareholder  of Class C Target Shares shall  be credited with the respective PRO
RATA number  of Class  C Acquiring  Fund Shares  due that  Shareholder, and  the
account  for a Shareholder of  Class Y Target Shares  shall be credited with the
respective  PRO  RATA  number  of  Class  Y  Acquiring  Fund  Shares  due   that
Shareholder).  All  outstanding  Target  Shares,  including  any  represented by
certificates, shall simultaneously be canceled on Target's share transfer books.
Acquiring Fund  shall not  issue certificates  representing the  Acquiring  Fund
Shares in connection with the Reorganization.
 
    1.6.   As soon as reasonably practicable after distribution of the Acquiring
Fund Shares pursuant to paragraph 1.5, Target shall be terminated as a series of
Investment Trust and any further actions shall be taken in connection  therewith
as required by applicable law.
 
    1.7.   Any reporting responsibility  of Target to a  public authority is and
shall remain its  responsibility up to  and including  the date on  which it  is
terminated.
 
    1.8.  Any transfer taxes payable upon issuance of Acquiring Fund Shares in a
name  other than that of  the registered holder on  Target's books of the Target
Shares constructively exchanged  therefor shall be  paid by the  person to  whom
such Acquiring Fund Shares are to be issued, as a condition of such transfer.
 
2.  VALUATION
 
    2.1.   For purposes of paragraph 1.1(a), Target's net value shall be (a) the
value of the Assets computed as of the close of regular trading on the New  York
Stock  Exchange, Inc.  ("NYSE") on the  date of the  Closing ("Valuation Time"),
using the valuation procedures set forth in Target's then-current prospectus and
statement of additional information less (b) the amount of the Liabilities as of
the Valuation Time.
 
    2.2.  For purposes of paragraph 1.1(a), the NAV of a share of each class  of
Acquiring  Fund Shares  shall be  computed as of  the Valuation  Time, using the
valuation procedures set forth in  Acquiring Fund's then-current prospectus  and
statement of additional information.
 
    2.3.   All computations pursuant to paragraphs  2.1 and 2.2 shall be made by
or under the direction of Mitchell Hutchins Asset Management Inc.
 
3.  CLOSING AND EFFECTIVE TIME
 
    3.1.  The Reorganization, together with related acts necessary to consummate
the same ("Closing"),  shall occur at  the Funds' principal  office on July  26,
1996, or at such other place and/or on such other date as the parties may agree.
All   acts  taking  place  at  the  Closing   shall  be  deemed  to  take  place
simultaneously as of the close of business on the date thereof or at such  other
time as the parties may agree ("Effective Time"). If,
 
                                      A-3
<PAGE>
immediately  before the  Valuation Time,  (a) the NYSE  is closed  to trading or
trading thereon is restricted or (b) trading or the reporting of trading on  the
NYSE  or elsewhere is disrupted, so that  accurate appraisal of the net value of
Target and the NAV per Acquiring Fund Share is impracticable, the Effective Time
shall be postponed until the first business day after the day when such  trading
shall have been fully resumed and such reporting shall have been restored.
 
    3.2.   Investment Trust shall  deliver to Securities Trust  at the Closing a
schedule of the Assets as of the  Effective Time, which shall set forth for  all
portfolio  securities  included therein  their  adjusted tax  basis  and holding
period by lot. Target's custodian shall deliver at the Closing a certificate  of
an  authorized officer stating that (a) the Assets held by the custodian will be
transferred to Acquiring Fund at the Effective Time and (b) all necessary  taxes
in conjunction with the delivery of the Assets, including all applicable federal
and state stock transfer stamps, if any, have been paid or provision for payment
has been made.
 
    3.3.   Investment Trust shall  deliver to Securities Trust  at the Closing a
list of the names and addresses of the Shareholders and the number (by class) of
outstanding Target Shares  owned by each  Shareholder, all as  of the  Effective
Time, certified by the Secretary or Assistant Secretary of Investment Trust. The
Transfer  Agent shall deliver at the Closing  a certificate as to the opening on
Acquiring Fund's share transfer  books of accounts  in the Shareholders'  names.
Securities  Trust shall  issue and  deliver a  confirmation to  Investment Trust
evidencing the Acquiring Fund Shares (by class) to be credited to Target at  the
Effective  Time or provide  evidence satisfactory to  Investment Trust that such
Acquiring Fund Shares have been credited to Target's account on Acquiring Fund's
books. At the Closing, each party shall deliver to the other such bills of sale,
checks, assignments, stock  certificates, receipts,  or other  documents as  the
other party or its counsel may reasonably request.
 
    3.4.   Each Investment Company  shall deliver to the  other at the Closing a
certificate executed in its name  by its President or  a Vice President in  form
and substance satisfactory to the recipient and dated the Effective Time, to the
effect  that the  representations and warranties  it made in  this Agreement are
true and correct at  the Effective Time  except as they may  be affected by  the
transactions contemplated by this Agreement.
 
4.  REPRESENTATIONS AND WARRANTIES
 
    4.1.  Target represents and warrants as follows:
 
        4.1.1.  Investment Trust is an unincorporated voluntary association with
    transferable shares organized as a business trust under a written instrument
    ("Business  Trust"); it  is duly  organized, validly  existing, and  in good
    standing under the laws of the Commonwealth of Massachusetts; and a copy  of
    its  Declaration of Trust is on file  with the Secretary of the Commonwealth
    of Massachusetts;
 
        4.1.2.  Investment Trust  is duly registered  as an open-end  management
    investment company under the 1940 Act, and such registration will be in full
    force and effect at the Effective Time;
 
        4.1.3.  Target is a duly established and designated series of Investment
    Trust;
 
        4.1.4.   At the Closing,  Target will have good  and marketable title to
    the Assets and full right, power,  and authority to sell, assign,  transfer,
    and  deliver the Assets  free of any  liens or other  encumbrances; and upon
    delivery and payment for  the Assets, Acquiring Fund  will acquire good  and
    marketable title thereto;
 
                                      A-4
<PAGE>
        4.1.5.     Target's  current  prospectus  and  statement  of  additional
    information conform in all material respects to the applicable  requirements
    of  the Securities Act of  1933 ("1933 Act") and the  1940 Act and the rules
    and regulations thereunder  and do  not include  any untrue  statement of  a
    material  fact or  omit to  state any  material fact  required to  be stated
    therein or  necessary  to make  the  statements  therein, in  light  of  the
    circumstances under which they were made, not misleading;
 
        4.1.6.  Target is not in violation of, and the execution and delivery of
    this Agreement and consummation of the transactions contemplated hereby will
    not  conflict  with  or  violate,  Massachusetts  law  or  any  provision of
    Investment Trust's  Declaration of  Trust or  By-Laws or  of any  agreement,
    instrument,  lease, or other  undertaking to which  Target is a  party or by
    which it is bound or  result in the acceleration  of any obligation, or  the
    imposition of any penalty, under any agreement, judgment, or decree to which
    Target is a party or by which it is bound, except as previously disclosed in
    writing to and accepted by Securities Trust;
 
        4.1.7.   Except  as otherwise  disclosed in  writing to  and accepted by
    Securities Trust,  all  material  contracts  and  other  commitments  of  or
    applicable  to Target (other  than this Agreement  and investment contracts,
    including options, futures,  and forward contracts)  will be terminated,  or
    provision  for discharge  of any  liabilities of  Target thereunder  will be
    made, at or prior to the Effective Time, without either Fund's incurring any
    liability or  penalty  with  respect  thereto  and  without  diminishing  or
    releasing  any rights Target may  have had with respect  to actions taken or
    omitted to be taken by any other party thereto prior to the Closing;
 
        4.1.8.  Except  as otherwise  disclosed in  writing to  and accepted  by
    Securities Trust, no litigation, administrative proceeding, or investigation
    of  or before  any court  or governmental body  is presently  pending or (to
    Target's knowledge)  threatened against  Investment  Trust with  respect  to
    Target  or any  of its properties  or assets that,  if adversely determined,
    would materially and  adversely affect Target's  financial condition or  the
    conduct  of its business; Target knows of no facts that might form the basis
    for the institution of any such litigation, proceeding, or investigation and
    is not a  party to or  subject to the  provisions of any  order, decree,  or
    judgment  of any  court or  governmental body  that materially  or adversely
    affects  its  business  or  its  ability  to  consummate  the   transactions
    contemplated hereby;
 
        4.1.9.   The execution, delivery, and  performance of this Agreement has
    been duly authorized as of  the date hereof by  all necessary action on  the
    part   of  Investment  Trust's  board  of   trustees,  which  has  made  the
    determinations required by Rule 17a-8(a) under the 1940 Act; and, subject to
    approval by Target's  shareholders and  receipt of  any necessary  exemptive
    relief  or no-action assurances  requested from the  Securities and Exchange
    Commission ("SEC") or its staff with respect to sections 17(a) and 17(d)  of
    the  1940 Act,  this Agreement will  constitute a valid  and legally binding
    obligation of Target, enforceable  in accordance with  its terms, except  as
    the  same  may be  limited by  bankruptcy, insolvency,  fraudulent transfer,
    reorganization, moratorium,  and  similar  laws  relating  to  or  affecting
    creditors' rights and by general principles of equity;
 
        4.1.10.   At the Effective Time, the performance of this Agreement shall
    have been duly authorized by all necessary action by Target's shareholders;
 
        4.1.11.  No governmental consents, approvals, authorizations, or filings
    are required under the 1933 Act, the Securities Exchange Act of 1934  ("1934
    Act"), or the 1940 Act for the execution or performance of this Agreement by
    Investment  Trust, except for (a) the filing  with the SEC of a registration
    statement by Securities Trust  on Form N-14 relating  to the Acquiring  Fund
    Shares issuable
 
                                      A-5
<PAGE>
    hereunder,   and   any  supplement   or  amendment   thereto  ("Registration
    Statement"),  including   therein  a   prospectus/proxy  statement   ("Proxy
    Statement"),  (b) receipt of the exemptive relief referenced in subparagraph
    4.1.9, and (c) such consents, approvals, authorizations, and filings as have
    been made or  received or  as may be  required subsequent  to the  Effective
    Time;
 
        4.1.12.   On  the effective date  of the Registration  Statement, at the
    time of the shareholders' meeting referred  to in paragraph 5.2, and at  the
    Effective Time, the Proxy Statement will (a) comply in all material respects
    with  the applicable provisions of the 1933  Act, the 1934 Act, and the 1940
    Act and the regulations thereunder and (b) not contain any untrue  statement
    of  a material fact or  omit to state a material  fact required to be stated
    therein or  necessary  to make  the  statements  therein, in  light  of  the
    circumstances  under  which  such  statements  were  made,  not  misleading;
    provided that the foregoing  shall not apply to  statements in or  omissions
    from  the  Proxy  Statement  made  in reliance  on  and  in  conformity with
    information furnished by Securities Trust for use therein;
 
        4.1.13.  The Liabilities were incurred by Target in the ordinary  course
    of its business;
 
        4.1.14.  Target is a "fund" as defined in section 851(h)(2) of the Code;
    it   qualified  for  treatment  as  a  regulated  investment  company  under
    Subchapter M  of  the Code  ("RIC")  for each  past  taxable year  since  it
    commenced operations and will continue to meet all the requirements for such
    qualification  for  its current  taxable year;  and it  has no  earnings and
    profits  accumulated  in  any  taxable  year  in  which  the  provisions  of
    Subchapter  M did not apply to it. The Assets shall be invested at all times
    through the Effective  Time in  a manner  that ensures  compliance with  the
    foregoing;
 
        4.1.15.  Target is not under the jurisdiction of a court in a proceeding
    under  Title 11 of the United States Code or similar case within the meaning
    of section 368(a)(3)(A) of the Code;
 
        4.1.16.   Not  more than  25%  of the  value  of Target's  total  assets
    (excluding  cash, cash items, and U.S. government securities) is invested in
    the stock and securities  of any one  issuer, and not more  than 50% of  the
    value  of such  assets is invested  in the  stock and securities  of five or
    fewer issuers; and
 
        4.1.17.  Target  will be  terminated as soon  as reasonably  practicable
    after  the Reorganization,  but in  all events  within six  months after the
    Effective Time.
 
    4.2  Acquiring Fund represents and warrants as follows:
 
        4.2.1.  Securities  Trust is  a Business  Trust; it  is duly  organized,
    validly existing, and in good standing under the laws of the Commonwealth of
    Massachusetts;  and a copy of  its Declaration of Trust  is on file with the
    Secretary of the Commonwealth of Massachusetts;
 
        4.2.2.  Securities Trust  is duly registered  as an open-end  management
    investment company under the 1940 Act, and such registration will be in full
    force and effect at the Effective Time;
 
        4.2.3.   Acquiring Fund  is a duly established  and designated series of
    Securities Trust;
 
        4.2.4.  No consideration other than Acquiring Fund Shares (and Acquiring
    Fund's assumption of  the Liabilities) will  be issued in  exchange for  the
    Assets in the Reorganization;
 
        4.2.5.   The Acquiring Fund Shares to  be issued and delivered to Target
    hereunder will, at the Effective Time,  have been duly authorized and,  when
    issued and delivered as provided herein, will be duly and validly issued and
    outstanding  shares of Acquiring Fund, fully paid and non-assessable, except
    to the extent that under Massachusetts law shareholders of a Business  Trust
    may, under certain
 
                                      A-6
<PAGE>
    circumstances,  be  held personally  liable for  its obligations.  Except as
    contemplated by this Agreement, Acquiring Fund does not have outstanding any
    options, warrants, or other rights to  subscribe for or purchase any of  its
    shares,  nor is there  outstanding any security convertible  into any of its
    shares;
 
        4.2.6.  Acquiring Fund's current prospectus and statement of  additional
    information  conform in all material respects to the applicable requirements
    of the 1933 Act and  the 1940 Act and  the rules and regulations  thereunder
    and  do not include any untrue statement of a material fact or omit to state
    any material fact  required to be  stated therein or  necessary to make  the
    statements  therein, in  light of  the circumstances  under which  they were
    made, not misleading;
 
        4.2.7.  Acquiring  Fund is not  in violation of,  and the execution  and
    delivery of this Agreement and consummation of the transactions contemplated
    hereby will not conflict with or violate, Massachusetts law or any provision
    of Securities Trust's Declaration of Trust or By-Laws or of any provision of
    any  agreement, instrument, lease,  or other undertaking  to which Acquiring
    Fund is a party or by which it is bound or result in the acceleration of any
    obligation, or the imposition of any penalty, under any agreement, judgment,
    or decree to which Acquiring Fund is a party or by which it is bound, except
    as previously disclosed in writing to and accepted by Investment Trust;
 
        4.2.8.  Except  as otherwise  disclosed in  writing to  and accepted  by
    Investment Trust, no litigation, administrative proceeding, or investigation
    of  or before  any court  or governmental body  is presently  pending or (to
    Acquiring Fund's knowledge) threatened against Securities Trust with respect
    to Acquiring Fund  or any  of its properties  or assets  that, if  adversely
    determined, would materially and adversely affect Acquiring Fund's financial
    condition  or the conduct of its business;  Acquiring Fund knows of no facts
    that might  form the  basis  for the  institution  of any  such  litigation,
    proceeding,  or  investigation and  is  not a  party  to or  subject  to the
    provisions of any order,  decree, or judgment of  any court or  governmental
    body  that materially  or adversely affects  its business or  its ability to
    consummate the transactions contemplated hereby;
 
        4.2.9  The execution,  delivery, and performance  of this Agreement  has
    been  duly authorized as of  the date hereof by  all necessary action on the
    part  of  Securities  Trust's  board   of  trustees,  which  has  made   the
    determinations required by Rule 17a-8(a) under the 1940 Act; and, subject to
    receipt  of any necessary exemptive relief or no-action assurances requested
    from the SEC or its  staff with respect to sections  17(a) and 17(d) of  the
    1940  Act,  this  Agreement  will constitute  a  valid  and  legally binding
    obligation of  Acquiring Fund,  enforceable in  accordance with  its  terms,
    except  as the  same may  be limited  by bankruptcy,  insolvency, fraudulent
    transfer, reorganization,  moratorium,  and  similar  laws  relating  to  or
    affecting creditors' rights and by general principles of equity;
 
        4.2.10.  No governmental consents, approvals, authorizations, or filings
    are  required under  the 1933  Act, the 1934  Act, or  the 1940  Act for the
    execution or performance of this  Agreement by Securities Trust, except  for
    (a)   the  filing  with  the  SEC   of  the  Registration  Statement  and  a
    post-effective amendment  to Securities  Trust's registration  statement  on
    Form  N1-A, (b) receipt  of the exemptive  relief referenced in subparagraph
    4.2.9, and (c) such consents, approvals, authorizations, and filings as have
    been made or  received or  as may be  required subsequent  to the  Effective
    Time;
 
        4.2.11.   On  the effective date  of the Registration  Statement, at the
    time of the shareholders' meeting referred  to in paragraph 5.2, and at  the
    Effective Time, the Proxy Statement will (a) comply in all material respects
    with  the applicable provisions of the 1933  Act, the 1934 Act, and the 1940
    Act and the regulations thereunder and (b) not contain any untrue  statement
    of a material fact or omit to state a
 
                                      A-7
<PAGE>
    material  fact  required  to be  stated  therein  or necessary  to  make the
    statements  therein,  in  light  of  the  circumstances  under  which   such
    statements  were made, not misleading; provided that the foregoing shall not
    apply to  statements  in or  omissions  from  the Proxy  Statement  made  in
    reliance on and in conformity with information furnished by Investment Trust
    for use therein;
 
        4.2.12.   Acquiring Fund is a "fund"  as defined in section 851(h)(2) of
    the Code; it qualified  for treatment as  a RIC for  each past taxable  year
    since it commenced operations and will continue to meet all the requirements
    for  such qualification for its current taxable year; Acquiring Fund intends
    to continue to meet all such requirements for the next taxable year; and  it
    has  no earnings and  profits accumulated in  any taxable year  in which the
    provisions of Subchapter M of the Code did not apply to it;
 
        4.2.13.  Acquiring  Fund has no  plan or intention  to issue  additional
    Acquiring  Fund Shares following the Reorganization except for shares issued
    in the ordinary course of its business as a series of an open-end investment
    company; nor does  Acquiring Fund have  any plan or  intention to redeem  or
    otherwise  reacquire any  Acquiring Fund  Shares issued  to the Shareholders
    pursuant to the  Reorganization, other than  through redemptions arising  in
    the ordinary course of that business;
 
        4.2.14.   Acquiring Fund (a) will actively continue Target's business in
    substantially  the  same   manner  that  Target   conducted  that   business
    immediately  before the Reorganization, (b) has no plan or intention to sell
    or otherwise dispose of any of  the Assets, except for dispositions made  in
    the  ordinary course of that business and dispositions necessary to maintain
    its status as a RIC, and (c) expects to retain substantially all the  Assets
    in the same form as it receives them in the Reorganization, unless and until
    subsequent investment circumstances suggest the desirability of change or it
    becomes necessary to make dispositions thereof to maintain such status;
 
        4.2.15.    There  is no  plan  or  intention for  Acquiring  Fund  to be
    dissolved or merged into another corporation or business trust or any "fund"
    thereof (within the meaning of section 851(h)(2) of the Code) following  the
    Reorganization;
 
        4.2.16.   Immediately after the Reorganization, (a) not more than 25% of
    the value of Acquiring Fund's total assets (excluding cash, cash items,  and
    U.S.  government securities) will be invested in the stock and securities of
    any one issuer and (b) not more than 50% of the value of such assets will be
    invested in the stock and securities of five or fewer issuers; and
 
        4.2.17.  Acquiring Fund does not own, directly or indirectly, nor at the
    Effective Time  will it  own,  directly or  indirectly,  nor has  it  owned,
    directly  or indirectly, at any time during  the past five years, any shares
    of Target.
 
    4.3.  Each Fund represents and warrants as follows:
 
        4.3.1.   The  fair market  value  of  the Acquiring  Fund  Shares,  when
    received by the Shareholders, will be approximately equal to the fair market
    value   of  their  Target  Shares  constructively  surrendered  in  exchange
    therefor;
 
        4.3.2.   Its management  (a) is  unaware  of any  plan or  intention  of
    Shareholders  to redeem or otherwise dispose of any portion of the Acquiring
    Fund Shares to be received  by them in the  Reorganization and (b) does  not
    anticipate  dispositions of  those Acquiring Fund  Shares at the  time of or
    soon after the  Reorganization to  exceed the  usual rate  and frequency  of
    dispositions  of  shares of  Target as  a series  of an  open-end investment
    company.  Consequently,   its  management   expects  that   the   percentage
 
                                      A-8
<PAGE>
    of Shareholder interests, if any, that will be disposed of as a result of or
    at  the  time  of  the  Reorganization will  be  DE  MINIMIS.  Nor  does its
    management anticipate  that  there  will  be  extraordinary  redemptions  of
    Acquiring Fund Shares immediately following the Reorganization;
 
        4.3.3.   The Shareholders will pay  their own expenses, if any, incurred
    in connection with the Reor-ganization;
 
        4.3.4.    Immediately  following  consummation  of  the  Reorganization,
    Acquiring  Fund will  hold substantially the  same assets and  be subject to
    substantially the  same  liabilities that  Target  held or  was  subject  to
    immediately  prior thereto, plus any liabilities and expenses of the parties
    incurred in connection with the Reorganization;
 
        4.3.5.  The fair  market value on  a going concern  basis of the  Assets
    will  equal or exceed  the Liabilities to  be assumed by  Acquiring Fund and
    those to which the Assets are subject;
 
        4.3.6.  There is no intercompany indebtedness between the Funds that was
    issued or acquired, or will be settled, at a discount;
 
        4.3.7.    Pursuant  to  the  Reorganization,  Target  will  transfer  to
    Acquiring  Fund, and Acquiring Fund  will acquire, at least  90% of the fair
    market value of the net assets, and at least 70% of the fair market value of
    the gross assets, held by Target immediately before the Reorganization.  For
    the  purposes of this representation, any amounts  used by Target to pay its
    Reorganization  expenses  and  redemptions  and  distributions  made  by  it
    immediately  before the Reorganization (except for (a) distributions made to
    conform to its policy of distributing all or substantially all of its income
    and gains  to avoid  the obligation  to pay  federal income  tax and/or  the
    excise  tax under section 4982  of the Code and  (b) redemptions not made as
    part of  the  Reorganization)  will  be  included  as  assets  thereof  held
    immediately before the Reorganization;
 
        4.3.8   None of the  compensation received by any  Shareholder who is an
    employee of Target will be separate consideration for, or allocable to,  any
    of  the  Target  Shares  held  by  such  Shareholder-employee;  none  of the
    Acquiring Fund  Shares received  by any  such Shareholder-employee  will  be
    separate  consideration for, or allocable  to, any employment agreement; and
    the consideration paid to any such Shareholder-employee will be for services
    actually rendered  and  will be  commensurate  with amounts  paid  to  third
    parties bargaining at arm's-length for similar services; and
 
        4.3.9.   Immediately after the Reorganization, the Shareholders will not
    own shares constituting "control"  of Acquiring Fund  within the meaning  of
    section 304(c) of the Code.
 
5.  COVENANTS
 
    5.1.  Each Fund covenants to operate its respective business in the ordinary
course  between the date  hereof and the  Closing, it being  understood that (a)
such ordinary course will include  declaring and paying customary dividends  and
other  distributions and such changes in  operations as are contemplated by each
Fund's normal  business  activities and  (b)  each Fund  will  retain  exclusive
control  of the  composition of its  portfolio until the  Closing; provided that
Target shall not dispose of more  than an insignificant portion of its  historic
business assets during such period without Acquiring Fund's prior consent.
 
    5.2.   Target covenants to call a  shareholders' meeting to consider and act
upon this Agreement and to take all other action necessary to obtain approval of
the transactions contemplated hereby.
 
                                      A-9
<PAGE>
    5.3.   Target covenants  that  the Acquiring  Fund  Shares to  be  delivered
hereunder  are not  being acquired  for the  purpose of  making any distribution
thereof, other than in accordance with the terms hereof.
 
    5.4.  Target  covenants that it  will assist Securities  Trust in  obtaining
such   information  as  Securities  Trust  reasonably  requests  concerning  the
beneficial ownership of Target Shares.
 
    5.5.  Target covenants that Target's books and records (including all  books
and  records required  to be  maintained under  the 1940  Act and  the rules and
regulations thereunder) will be turned over to Securities Trust at the Closing.
 
    5.6.  Each Fund covenants to  cooperate in preparing the Proxy Statement  in
compliance with applicable federal securities laws.
 
    5.7.   Each  Fund covenants  that it will,  from time  to time,  as and when
requested by the other  Fund, execute and  deliver or cause  to be executed  and
delivered  all such assignments and other instruments, and will take or cause to
be taken such further action, as the other Fund may deem necessary or  desirable
in order to vest in, and confirm to, (a) Acquiring Fund, title to and possession
of all the Assets, and (b) Target, title to and possession of the Acquiring Fund
Shares  to be  delivered hereunder,  and otherwise to  carry out  the intent and
purpose hereof.
 
    5.8.  Acquiring Fund covenants to  use all reasonable efforts to obtain  the
approvals  and authorizations required by  the 1933 Act, the  1940 Act, and such
state securities  laws  it  may  deem  appropriate  in  order  to  continue  its
operations after the Effective Time.
 
    5.9.   Subject to this Agreement, each Fund covenants to take or cause to be
taken all  actions,  and to  do  or cause  to  be done  all  things,  reasonably
necessary,  proper, or advisable  to consummate and  effectuate the transactions
contemplated hereby.
 
6.  CONDITIONS PRECEDENT
 
    Each Fund's obligations hereunder shall be subject to (a) performance by the
other Fund of all  the obligations to  be performed hereunder  at or before  the
Effective  Time,  (b)  all  representations and  warranties  of  the  other Fund
contained herein being true and correct in all material respects as of the  date
hereof  and, except  as they  may be  affected by  the transactions contemplated
hereby, as of the Effective Time, with the  same force and effect as if made  at
and  as of the Effective Time, and (c) the following further conditions that, at
or before the Effective Time:
 
    6.1.  This  Agreement and  the transactions contemplated  hereby shall  have
been duly adopted and approved by Investment Trust's board of trustees and shall
have been approved by Target's shareholders in accordance with applicable law.
 
    6.2.   All  necessary filings shall  have been  made with the  SEC and state
securities authorities, and no order or directive shall have been received  that
any  other or further action is required to  permit the parties to carry out the
transactions contemplated hereby. The  Registration Statement shall have  become
effective  under  the  1933 Act,  no  stop orders  suspending  the effectiveness
thereof shall have been issued, and the SEC shall not have issued an unfavorable
report with respect to  the Reorganization under section  25(b) of the 1940  Act
nor   instituted  any  proceedings   seeking  to  enjoin   consummation  of  the
transactions contemplated  hereby  under section  25(c)  of the  1940  Act.  All
consents,   orders,  and  permits  of   federal,  state,  and  local  regulatory
authorities  (including  the  SEC  and  state  securities  authorities)   deemed
necessary by either Fund
 
                                      A-10
<PAGE>
to   permit  consummation,  in  all   material  respects,  of  the  transactions
contemplated hereby shall  have been  obtained, except where  failure to  obtain
same  would not  involve a risk  of a material  adverse effect on  the assets or
properties of either Fund, provided that either Fund may for itself waive any of
such conditions.
 
    6.3.  At the Effective Time, no  action, suit, or other proceeding shall  be
pending  before  any court  or  governmental agency  in  which it  is  sought to
restrain or prohibit, or to obtain  damages or other relief in connection  with,
the transactions contemplated hereby.
 
    6.4.    Investment Trust  shall have  received an  opinion of  Kirkpatrick &
Lockhart LLP, counsel to Securities Trust, substantially to the effect that:
 
        6.4.1.  Acquiring Fund is a duly established series of Securities Trust,
    a Business Trust duly organized and  validly existing under the laws of  the
    Commonwealth  of Massachusetts with power under  its Declaration of Trust to
    own all of its properties and assets and, to the knowledge of such  counsel,
    to carry on its business as presently conducted;
 
        6.4.2.    This Agreement  (a) has  been  duly authorized,  executed, and
    delivered by Securities Trust on behalf  of Acquiring Fund and (b)  assuming
    due  authorization, execution, and delivery  of this Agreement by Investment
    Trust on behalf  of Target,  is a valid  and legally  binding obligation  of
    Securities  Trust with respect to  Acquiring Fund, enforceable in accordance
    with its terms, except as the same may be limited by bankruptcy, insolvency,
    fraudulent transfer, reorganization, moratorium,  and similar laws  relating
    to or affecting creditors' rights and by general principles of equity;
 
        6.4.3.   The Acquiring Fund  Shares to be issued  and distributed to the
    Shareholders  under  this   Agreement,  assuming  their   due  delivery   as
    contemplated  by this Agreement, will be  duly authorized and validly issued
    and outstanding and fully paid and non-assessable, except to the extent that
    under Massachusetts law shareholders of a Business Trust may, under  certain
    circumstances,  be  held  personally  liable  for  its  obligations,  and no
    shareholder of Acquiring Fund has any  preemptive right to subscribe for  or
    purchase such shares;
 
        6.4.4.   The execution and  delivery of this Agreement  did not, and the
    consummation of the  transactions contemplated hereby  will not,  materially
    violate  Securities Trust's Declaration of Trust or By-Laws or any provision
    of any agreement (known to such counsel, without any independent inquiry  or
    investigation) to which Securities Trust (with respect to Acquiring Fund) is
    a  party or  by which  it is  bound or  (to the  knowledge of  such counsel,
    without any independent inquiry or investigation) result in the acceleration
    of any obligation, or  the imposition of any  penalty, under any  agreement,
    judgment,  or decree  to which Securities  Trust (with  respect to Acquiring
    Fund) is a  party or  by which  it is  bound, except  as set  forth in  such
    opinion  or as previously disclosed in writing to and accepted by Investment
    Trust;
 
        6.4.5.   To  the knowledge  of  such counsel  (without  any  independent
    inquiry  or investigation), no consent, approval, authorization, or order of
    any court  or governmental  authority is  required for  the consummation  by
    Securities   Trust  on  behalf   of  Acquiring  Fund   of  the  transactions
    contemplated herein, except such as have  been obtained under the 1933  Act,
    the  1934 Act,  and the  1940 Act and  such as  may be  required under state
    securities laws;
 
        6.4.6.  Securities  Trust is registered  with the SEC  as an  investment
    company,  and to the knowledge  of such counsel no  order has been issued or
    proceeding instituted to suspend such registration; and
 
                                      A-11
<PAGE>
        6.4.7.   To  the knowledge  of  such counsel  (without  any  independent
    inquiry  or investigation), (a) no litigation, administrative proceeding, or
    investigation of or  before any  court or  governmental body  is pending  or
    threatened as to Securities Trust (with respect to Acquiring Fund) or any of
    its properties or assets attributable or allocable to Acquiring Fund and (b)
    Securities  Trust (with  respect to  Acquiring Fund)  is not  a party  to or
    subject to the provisions of any order, decree, or judgment of any court  or
    governmental  body that  materially and  adversely affects  Acquiring Fund's
    business, except as set forth in  such opinion or as otherwise disclosed  in
    writing to and accepted by Investment Trust.
 
In  rendering such opinion, such counsel may (i) rely, as to matters governed by
the laws  of the  Commonwealth  of Massachusetts,  on  an opinion  of  competent
Massachusetts   counsel,  (ii)  make  assumptions  regarding  the  authenticity,
genuineness,  and/or  conformity  of   documents  and  copies  thereof   without
independent verification thereof, (iii) limit such opinion to applicable federal
and  state law, and (iv)  define the word "knowledge"  and related terms to mean
the knowledge of  attorneys then  with such  firm who  have devoted  substantive
attention to matters directly related to this Agreement and the Reorganization.
 
    6.5.    Securities Trust  shall have  received an  opinion of  Kirkpatrick &
Lockhart LLP, counsel to Investment Trust, substantially to the effect that:
 
        6.5.1.   Target is  a duly  established series  of Investment  Trust,  a
    Business  Trust duly  organized and validly  existing under the  laws of the
    Commonwealth of Massachusetts with power  under its Declaration of Trust  to
    own  all of its properties and assets and, to the knowledge of such counsel,
    to carry on its business as presently conducted;
 
        6.5.2.   This Agreement  (a)  has been  duly authorized,  executed,  and
    delivered  by  Investment Trust  on behalf  of Target  and (b)  assuming due
    authorization, execution, and delivery of this Agreement by Securities Trust
    on behalf of Acquiring  Fund, is a valid  and legally binding obligation  of
    Investment  Trust with respect to Target, enforceable in accordance with its
    terms, except  as  the  same  may  be  limited  by  bankruptcy,  insolvency,
    fraudulent  transfer, reorganization, moratorium,  and similar laws relating
    to or affecting creditors' rights and by general principles of equity;
 
        6.5.3.  The execution  and delivery of this  Agreement did not, and  the
    consummation  of the  transactions contemplated hereby  will not, materially
    violate Investment Trust's Declaration of Trust or By-Laws or any  provision
    of  any agreement (known to such counsel, without any independent inquiry or
    investigation) to which Investment Trust (with respect to Target) is a party
    or by which it is  bound or (to the knowledge  of such counsel, without  any
    independent  inquiry  or investigation)  result in  the acceleration  of any
    obligation, or the imposition of any penalty, under any agreement, judgment,
    or decree to which Investment Trust (with  respect to Target) is a party  or
    by  which it is bound, except as set  forth in such opinion or as previously
    disclosed in writing to and accepted by Securities Trust;
 
        6.5.4.   To  the knowledge  of  such counsel  (without  any  independent
    inquiry  or investigation), no consent, approval, authorization, or order of
    any court  or governmental  authority is  required for  the consummation  by
    Investment  Trust  on  behalf  of Target  of  the  transactions contemplated
    herein, except such as have been obtained under the 1933 Act, the 1934  Act,
    and the 1940 Act and such as may be required under state securities laws;
 
        6.5.5.   Investment  Trust is registered  with the SEC  as an investment
    company, and to the knowledge  of such counsel no  order has been issued  or
    proceeding instituted to suspend such registration; and
 
                                      A-12
<PAGE>
        6.5.6.    To  the knowledge  of  such counsel  (without  any independent
    inquiry or investigation), (a) no litigation, administrative proceeding,  or
    investigation  of or  before any  court or  governmental body  is pending or
    threatened as to  Investment Trust (with  respect to Target)  or any of  its
    properties  or assets attributable or allocable to Target and (b) Investment
    Trust (with  respect  to  Target) is  not  a  party to  or  subject  to  the
    provisions  of any order,  decree, or judgment of  any court or governmental
    body that materially and adversely affects Target's business, except as  set
    forth  in such opinion or as otherwise  disclosed in writing to and accepted
    by Securities Trust.
 
In rendering such opinion, such counsel may (i) rely, as to matters governed  by
the  laws  of the  Commonwealth  of Massachusetts,  on  an opinion  of competent
Massachusetts  counsel,  (ii)  make  assumptions  regarding  the   authenticity,
genuineness,   and/or  conformity  of  documents   and  copies  thereof  without
independent verification thereof, (iii) limit such opinion to applicable federal
and state law, and (iv)  define the word "knowledge"  and related terms to  mean
the  knowledge of  attorneys then  with such  firm who  have devoted substantive
attention to matters directly related to this Agreement and the Reorganization.
 
    6.6.  Each Investment Company shall have received an opinion of  Kirkpatrick
& Lockhart LLP, its counsel, addressed to and in form and substance satisfactory
to  it,  as  to  the  federal  income  tax  consequences  mentioned  below ("Tax
Opinion"). In rendering  the Tax Opinion,  such counsel may  rely as to  factual
matters,    exclusively   and   without   independent   verification,   on   the
representations made in this Agreement (or in separate letters addressed to such
counsel) and  the certificates  delivered  pursuant to  paragraph 3.4.  The  Tax
Opinion  shall  be substantially  to the  effect  that, based  on the  facts and
assumptions stated therein, for federal income tax purposes:
 
        6.6.1.  Acquiring Fund's  acquisition of the  Assets in exchange  solely
    for   Acquiring  Fund  Shares   and  Acquiring  Fund's   assumption  of  the
    Liabilities, followed  by  Target's  distribution of  those  shares  to  the
    Share-holders  constructively  in  exchange  for  the  Shareholders'  Target
    Shares, will  constitute  a reorganization  within  the meaning  of  section
    368(a)(1)(C)   of  the  Code,  and   each  Fund  will  be   "a  party  to  a
    reorganization" within the meaning of section 368(b) of the Code;
 
        6.6.2.  No gain or loss will be recognized to Target on the transfer  to
    Acquiring  Fund of the  Assets in exchange solely  for Acquiring Fund Shares
    and Acquiring  Fund's assumption  of the  Liabilities or  on the  subsequent
    distribution  of those shares  to the Shareholders  in constructive exchange
    for their Target Shares;
 
        6.6.3.  No  gain or loss  will be  recognized to Acquiring  Fund on  its
    receipt  of the Assets in exchange solely  for Acquiring Fund Shares and its
    assumption of the Liabilities;
 
        6.6.4.  Acquiring Fund's basis  for the Assets will  be the same as  the
    basis  thereof in Target's hands  immediately before the Reorganization, and
    Acquiring Fund's holding period for the Assets will include Target's holding
    period therefor;
 
        6.6.5.  A Shareholder will recognize no gain or loss on the constructive
    exchange of all its Target Shares solely for Acquiring Fund Shares  pursuant
    to the Reorganization; and
 
        6.6.6.    A Shareholder's  basis  for the  Acquiring  Fund Shares  to be
    received by it in the Reorganization will  be the same as the basis for  its
    Target  Shares  to  be  constructively  surrendered  in  exchange  for those
    Acquiring Fund  Shares, and  its  holding period  for those  Acquiring  Fund
    Shares  will include  its holding period  for those  Target Shares, provided
    they are held as capital assets by the Shareholder at the Effective Time.
 
                                      A-13
<PAGE>
Notwithstanding subparagraphs 6.6.2 and 6.6.4, the Tax Opinion may state that no
opinion is expressed as to the effect of the Reorganization on the Funds or  any
Shareholder with respect to any asset as to which any unrealized gain or loss is
required  to  be recognized  for federal  income tax  purposes at  the end  of a
taxable year (or on the termination or transfer thereof) under a  mark-to-market
system of accounting.
 
    At  any time  before the Closing,  (a) Acquiring  Fund may waive  any of the
foregoing conditions  if,  in  the  judgment  of  Securities  Trust's  board  of
trustees,   such  waiver  will  not  have  a  material  adverse  effect  on  its
shareholders'  interests,  and  (b)  Target  may  waive  any  of  the  foregoing
conditions  if, in  the judgment of  Investment Trust's board  of trustees, such
waiver will not have a material adverse effect on the Shareholders' interests.
 
7.  BROKERAGE FEES AND EXPENSES
 
    7.1.  Each  Investment Company  represents and  warrants to  the other  that
there  are no brokers or finders entitled  to receive any payments in connection
with the transactions provided for herein.
 
    7.2.   Except  as  otherwise  provided  herein,  all  expenses  incurred  in
connection  with the transactions contemplated by this Agreement (whether or not
they are consummated) will  be borne by the  Funds proportionately, as  follows:
each  such expense will be borne by  the Funds in proportion to their respective
net assets as of the close of business on the last business day of the month  in
which  such expense was incurred. Such expenses include (a) expenses incurred in
connection with entering into and carrying out the provisions of this Agreement,
(b) expenses associated  with preparing and  filing the Registration  Statement,
(c) registration or qualification fees and expenses of preparing and filing such
forms  as are  necessary under applicable  state securities laws  to qualify the
Acquiring Fund Shares to be issued in connection herewith in each state in which
Target's shareholders are resident as  of the date of  the mailing of the  Proxy
Statement to such shareholders, (d) printing and postage expenses, (e) legal and
accounting fees, and (f) solicitation costs.
 
8.  ENTIRE AGREEMENT; SURVIVAL
 
    Neither  party has  made any representation,  warranty, or  covenant not set
forth herein, and this  Agreement constitutes the  entire agreement between  the
parties.  The representations, warranties, and  covenants contained herein or in
any document delivered pursuant hereto  or in connection herewith shall  survive
the Closing.
 
9.  TERMINATION OF AGREEMENT
 
    This  Agreement may be terminated  at any time at  or prior to the Effective
Time, whether before or after approval by Target's shareholders:
 
    9.1.  By either Fund (a) in the event of the other Fund's material breach of
any representation, warranty, or covenant contained herein to be performed at or
prior to the Effective Time, (b) if a condition to its obligations has not  been
met  and it reasonably appears that such condition will not or cannot be met, or
(c) if the Closing has not occurred on or before October 31, 1996; or
 
    9.2.  By the parties' mutual agreement.
 
In the event of termination under paragraphs  9.1.(c) or 9.2, there shall be  no
liability for damages on the part of either Fund, or the trustees or officers of
either Investment Company, to the other Fund.
 
                                      A-14
<PAGE>
10.  AMENDMENT
 
    This  Agreement  may  be amended,  modified,  or supplemented  at  any time,
notwithstanding approval thereof by Target's shareholders, in such manner as may
be mutually agreed upon in writing by the parties; provided that following  such
approval  no  such  amendment  shall  have  a  material  adverse  effect  on the
Shareholders' interests.
 
11.  MISCELLANEOUS
 
    11.1.  This Agreement shall be governed by and construed in accordance  with
the  internal laws of  the Commonwealth of Massachusetts;  provided that, in the
case of any  conflict between  such laws and  the federal  securities laws,  the
latter shall govern.
 
    11.2.  Nothing expressed or implied herein is intended or shall be construed
to  confer upon or give  any person, firm, trust,  or corporation other than the
parties and their respective successors and assigns any rights or remedies under
or by reason of this Agreement.
 
    11.3.  The parties  acknowledge that each Investment  Company is a  Business
Trust. Notice is hereby given that this instrument is executed on behalf of each
Investment  Company's trustees  solely in  their capacity  as trustees,  and not
individually,  and  that  each  Investment  Company's  obligations  under   this
instrument  are  not binding  on  or enforceable  against  any of  its trustees,
officers, or shareholders, but are only  binding on and enforceable against  the
respective  Funds' assets and property. Each  Fund agrees that, in asserting any
rights or claims under this  Agreement, it shall look  only to the other  Fund's
assets  and property  in settlement  of such  rights or  claims and  not to such
trustees or shareholders.
 
    IN WITNESS WHEREOF, each party has  caused this Agreement to be executed  by
its duly authorized officer.
 
<TABLE>
<S>                       <C>        <C>                       <C>
ATTEST:                   PAINEWEBBER SECURITIES TRUST,
                          on behalf of its series,
                          PAINEWEBBER SMALL CAP VALUE FUND
 
    /s/ Ilene Shore       By:        /s/ Dianne E. O'Donnell
- ------------------------             ------------------------
  Assistant Secretary                     Vice President
 
ATTEST:                   PAINEWEBBER INVESTMENT TRUST III,
                          on behalf of its series,
                          PAINEWEBBER SMALL CAP GROWTH FUND
 
    /s/ Ilene Shore       By:          /s/ Keith A. Weller
- ------------------------             ------------------------
  Assistant Secretary                     Vice President
</TABLE>
 
                                      A-15
<PAGE>


                                                                          PROXY
                                                                          -----




     PAINEWEBBER INVESTMENT TRUST III -- PAINEWEBBER SMALL CAP GROWTH FUND
                Special Meeting of Shareholders - July 19, 1996


The undersigned hereby appoints as proxies Dianne E. O'Donnell and Ilene 
Shore and each of them (with power of substitution) to vote for the 
undersigned all shares of beneficial interest in the undersigned 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 indicate authority to vote "For" all proposals.  
This proxy is solicited on behalf of the board of trustees of Painewebber 
Investment Trust III.

                             YOUR VOTE IS IMPORTANT

    This proxy will not be voted unless it is dated and signed exactly as 
instructed below.


If the 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 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."

Sign exactly as name appears hereon.

Dated: _____________________________, 1996

__________________________________________
         Signature of Shareholder

__________________________________________
          Signature of Co-owner


<PAGE>

      PLEASE INDICATE YOUR VOTE BY FILLING IN THE APPROPRIATE BOX BELOW.
                THE BOARD OF TRUSTEES RECOMMENDS A VOTE "FOR"

1.   Approval of an Agreement and Plan of Reorganization and Termination 
between PaineWebber Small Cap Value Fund and PaineWebber Small Cap Growth 
Fund. 

     FOR  _______       AGAINST  _______       ABSTAIN  ______


       PLEASE SIGN AND DATE THIS PROXY ON THE REVERSE SIDE AND RETURN IT
             IN THE ENCLOSED ENVELOPE TO PAINEWEBBER MUTUAL FUNDS,
                     PO BOX 104, SMITHTOWN, NY 11787-8617



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