PAINEWEBBER SECURITIES TRUST
485BPOS, 1996-09-27
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<PAGE>
        
      As filed with the Securities and Exchange Commission on September 27, 1996
         
                                              1933 Act Registration No. 33-55374
                                              1940 Act Registration No. 811-7374

                          SECURITIES AND EXCHANGE COMMISSION
                               Washington, D.C.  20549

                                      FORM N-1A

         REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933     [  X  ]
                                                                       -----

              Pre-Effective Amendment No.                        [      ]
                                          -------                 ------
        
              Post-Effective Amendment No.  15                   [  X   ]
                                          -------                 ------
         
      REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940   [  X  ] 
                                                                         -----  
                      
              Amendment No.    15   
                             -------
         
                             PAINEWEBBER SECURITIES TRUST
                  (Exact name of registrant as specified in charter)

                             1285 Avenue of the Americas
                              New York, New York  10019
                       (Address of principal executive offices)
          Registrant's telephone number, including area code: (212) 713-2000

                              DIANNE E. O'DONNELL, Esq.
                       Mitchell Hutchins Asset Management Inc.
                             1285 Avenue of the Americas
                              New York, New York  10019
                       (Name and address of agent for service)
        
                                     Copies to:
                                ELINOR W. GAMMON, Esq.
                               BRUCE W. MCDOUGAL, Esq.
         
                             Kirkpatrick & Lockhart LLP
                    1800 Massachusetts Avenue, N.W., Second Floor
                             Washington, D.C.  20036-1800
                              Telephone: (202) 778-9000

              It is proposed that this filing will become effective:
        
     [ X  ]   Immediately upon filing pursuant to Rule 485(b)
      ----
     [     ]  On                   pursuant to Rule 485(b)
      -----      -----------------
     [     ]  60 days after filing pursuant to Rule 485(a)(i)
      -----
         
     [     ]  On                   pursuant to Rule 485(a)(i)
      -----      -----------------
<PAGE>



     [     ]  75 days after filing pursuant to Rule 485(a)(ii)
      -----
     [     ]  On                   pursuant to Rule 485(a)(ii)
      -----      -----------------

     If appropriate, check the following box:
     [     ]     This post-effective amendment designates a new effective date
      ----- for a previously filed post-effective amendment

        
     Registrant  has  filed a  declaration  pursuant  to  Rule  24f-2 under  the
     Investment Company Act of 1940 and filed  the notice required by such  Rule
     for its most recent fiscal year on September 26, 1996.
         
<PAGE>






                             PaineWebber Securities Trust
                          Contents of Registration Statement


     This  Registration   Statement  consists  of   the  following  papers   and
     documents:

     Cover Sheet

     Contents of Registration Statement

     Cross Reference Sheets

        
     Class A, B and C shares of:

              PaineWebber Small Cap Fund
              --------------------------

              Part A - Prospectus **
              Part B - Statement of Additional Information**

              PaineWebber Strategic Income Fund
              ---------------------------------

              Part A - Prospectus*
              Part B - Statement of Additional Information*
         

     Class Y shares of:

              PaineWebber Small Cap Fund
              --------------------------

              Part A - Prospectus***
              Part B - Statement of Additional Information***

        
              PaineWebber Strategic Income Fund
              ---------------------------------

              Part A - Prospectus*
              Part B - Statement of Additional Information*

         

     Part C - Other Information

     Signature Page

     Exhibits

        
     *        Previously  filed  in  Post-Effective  Amendment  No.  13  to  the
<PAGE>






              Registrant's  registration statement,  SEC File  No.  33-55374, on
              May 31, 1996.

     **       Previously  filed  in  Post-Effective  Amendment  No.  10  to  the
              Registrant's registration  statement, SEC  File No.  33-55374,  on
              April 26, 1996.

     ***      Previously  filed  in  Post-Effective  Amendment  No.  14  to  the
              Registrant's  registration  statement, SEC  File No.  33-55374, on
              June 28, 1996.
         
<PAGE>






        
                            PaineWebber Securities Trust:
                          PaineWebber Strategic Income Fund
                              (Class A, B and C Shares)

                           Form N-1A Cross Reference Sheet

     <TABLE>
     <CAPTION>
                    Part A Item No. and Caption                  Prospectus Caption
                    ---------------------------                  ------------------

       <S>          <C>                                          <C>
       1.           Cover Page  . . . . . . . . . . . . . . .    Cover Page

       2.           Synopsis  . . . . . . . . . . . . . . . .    Prospectus Summary

       3.           Condensed Financial Information . . . . .    Performance Information; Financial Highlights
       4.           General Description of Registrant . . . .    Prospectus Summary; Investment Objective, Policies and Risk
                                                                 Considerations; General Information

       5.           Management of the Fund  . . . . . . . . .    Management; General Information
       6.           Capital Stock and Other Securities  . . .    Cover Page; Conversion of Class B Shares; Dividends and Taxes;
                                                                 General Information

       7.           Purchase of Securities Being Offered  . .    Purchases; Exchanges; Valuation of Shares; Other Services and
                                                                 Information; Management

       8.           Redemption of Repurchase  . . . . . . . .    Redemptions, Other Services and Information
       9.           Pending Legal Proceedings . . . . . . . .    Not Applicable

                    Part B Item No. and Caption                  Statement of Additional Information Caption
                    ---------------------------                  -------------------------------------------
       10.          Cover page  . . . . . . . . . . . . . . .    Cover Page

       11.          Table of Contents . . . . . . . . . . . .    Table of Contents

       12.          General Information and History . . . . .    Not Applicable
       13.          Investment Objective and Policies . . . .    Investment Policies and Restrictions; Hedging and Related
                                                                 Income Strategies; Portfolio Transactions

       14.          Management of the Fund  . . . . . . . . .    Trustees and Officers
       15.          Control Persons and Principal Holders of     Trustees and Officers
                    Securities  . . . . . . . . . . . . . . .

       16.          Investment Advisory and Other Services  .    Investment Advisory and Distribution Arrangements; Other
                                                                 Information

       17.          Brokerage Allocation  . . . . . . . . . .    Portfolio Transactions
       18.          Capital Stock and Other Securities  . . .    Conversion of Class B Shares; Other Information

       19.          Purchase, Redemption and Pricing of          Reduced Sales Charges, Additional Exchange and Redemption
                    Securities Being Offered  . . . . . . . .    Information and Other Services; Valuation of Shares 
<PAGE>






       20.          Tax Status  . . . . . . . . . . . . . . .    Taxes

       21.          Underwriters  . . . . . . . . . . . . . .    Investment Advisory and Distribution Arrangements
       22.          Calculation of Performance Data . . . . .    Performance Information

       23.          Financial Statements  . . . . . . . . . .    Financial Statements
         
     </TABLE>
<PAGE>






        
                            PaineWebber Securities Trust:
                          PaineWebber Strategic Income Fund
                                   (Class Y Shares)

                           Form N-1A Cross Reference Sheet

     <TABLE>
     <CAPTION>
                    Part A Item No. and Caption                  Prospectus Caption
                    ---------------------------                  ------------------

       <S>          <C>                                          <C>
       1.           Cover Page  . . . . . . . . . . . . . . .    Cover Page

       2.           Synopsis  . . . . . . . . . . . . . . . .    Fund Expenses

       3.           Condensed Financial Information . . . . .    Financial Highlights
       4.           General Description of Registrant . . . .    Prospectus Summary; Investment Objective, Policies and Risk
                                                                 Considerations; General Information

       5.           Management of the Fund  . . . . . . . . .    Management; General Information
       6.           Capital Stock and Other Securities  . . .    Cover Page; Dividends and Taxes; General Information

       7.           Purchase of Securities Being Offered  . .    Purchases; Valuation of Shares; Management

       8.           Redemption of Repurchase  . . . . . . . .    Redemptions
       9.           Pending Legal Proceedings . . . . . . . .    Not Applicable

                    Part B Item No. and Caption                  Statement of Additional Information Caption
                    ---------------------------                  -------------------------------------------
       10.          Cover page  . . . . . . . . . . . . . . .    Cover Page

       11.          Table of Contents . . . . . . . . . . . .    Table of Contents

       12.          General Information and History . . . . .    Not Applicable
       13.          Investment Objective and Policies . . . .    Investment Policies and Restrictions; Hedging and Related
                                                                 Income Strategies; Portfolio Transactions

       14.          Management of the Fund  . . . . . . . . .    Trustees and Officers
       15.          Control Persons and Principal Holders of     Trustees and Officers
                    Securities  . . . . . . . . . . . . . . .

       16.          Investment Advisory and Other Services  .    Investment Advisory and Distribution Arrangements; Other
                                                                 Information

       17.          Brokerage Allocation  . . . . . . . . . .    Portfolio Transactions
       18.          Capital Stock and Other Securities  . . .    Other Information

       19.          Purchase, Redemption and Pricing of          Valuation of Shares 
                    Securities Being Offered  . . . . . . . .
       20.          Tax Status  . . . . . . . . . . . . . . .    Taxes
<PAGE>






       21.          Underwriters  . . . . . . . . . . . . . .    Investment Advisory and Distribution Arrangements

       22.          Calculation of Performance Data . . . . .    Performance Information
       23.          Financial Statements  . . . . . . . . . .    Financial Statements
         
     </TABLE>
<PAGE>






        
                            PAINEWEBBER SECURITIES TRUST:
                             PaineWebber Small Cap Fund
                              (Class A, B and C Shares)

                           Form N-1A Cross Reference Sheet

     <TABLE>
     <CAPTION>
                    Part A Item No. and Caption                  Prospectus Caption
                    ---------------------------                  ------------------

       <S>          <C>                                          <C>
       1.           Cover Page  . . . . . . . . . . . . . . .    Cover Page

       2.           Synopsis  . . . . . . . . . . . . . . . .    The Funds at a Glance; Expense Table

       3.           Condensed Financial Information . . . . .    Financial Highlights; Performance
       4.           General Description of Registrant . . . .    The Funds at a Glance; Investment Objective & Policies;
                                                                 Investment Philosophy & Process; The Funds' Investments;
                                                                 General Information

       5.           Management of the Fund  . . . . . . . . .    Management; General Information
       6.           Capital Stock and Other Securities  . . .    Cover Page; Flexible Pricing; Dividends and Taxes; General
                                                                 Information

       7.           Purchase of Securities Being Offered  . .    Flexible Pricing; How to Buy Shares; Other Services;
                                                                 Determining the Shares' Net Asset Value

       8.           Redemption of Repurchase  . . . . . . . .    How to Sell Shares; Other Services
       9.           Pending Legal Proceedings . . . . . . . .    Not Applicable

                    Part B Item No. and Caption                  Statement of Additional Information Caption
                    ---------------------------                  -------------------------------------------
       10.          Cover page  . . . . . . . . . . . . . . .    Cover Page

       11.          Table of Contents . . . . . . . . . . . .    Table of Contents

       12.          General Information and History . . . . .    Not Applicable
       13.          Investment Objective and Policies . . . .    Investment Policies and Restrictions; Hedging Strategies;
                                                                 Portfolio Transactions

       14.          Management of the Fund  . . . . . . . . .    Trustees and Officers; Principal Shareholders
       15.          Control Persons and Principal Holders of     Trustees and Officers; Principal Shareholders
                    Securities  . . . . . . . . . . . . . . .

       16.          Investment Advisory and Other Services  .    Investment Advisory and Distribution Arrangements; Other
                                                                 Information

       17.          Brokerage Allocation  . . . . . . . . . .    Portfolio Transactions
       18.          Capital Stock and Other Securities  . . .    Conversion of Class B Shares; Other Information
<PAGE>






       19.          Purchase, Redemption and Pricing of          Reduced Sales Charges, Additional Exchange and Redemption
                    Securities Being Offered  . . . . . . . .    Information and Other Services; Valuation of Shares 

       20.          Tax Status  . . . . . . . . . . . . . . .    Taxes
       21.          Underwriters  . . . . . . . . . . . . . .    Investment Advisory and Distribution Arrangements

       22.          Calculation of Performance Data . . . . .    Performance Information

       23.          Financial Statements  . . . . . . . . . .    Financial Statements
         
     </TABLE>
<PAGE>







                            PAINEWEBBER SECURITIES TRUST:
        
                             PaineWebber Small Cap Fund
         
                                   (Class Y Shares)

                           Form N-1A Cross Reference Sheet

     <TABLE>
     <CAPTION>
                    Part A Item No. and Caption                  Prospectus Caption
                    ---------------------------                  ------------------

       <S>          <C>                                          <C>
       1.           Cover Page  . . . . . . . . . . . . . . .    Cover Page

       2.           Synopsis  . . . . . . . . . . . . . . . .    Expense Table

       3.           Condensed Financial Information . . . . .    Performance
       4.           General Description of Registrant . . . .    The Funds at a Glance; Investment Objective & Policies;
                                                                 Investment Philosophy & Process; The Funds' Investments;
                                                                 General Information

       5.           Management of the Fund  . . . . . . . . .    Management; General Information
       6.           Capital Stock and Other Securities  . . .    Cover Page; Dividends and Taxes; General Information

       7.           Purchase of Securities Being Offered  . .    How to Buy Shares; Determining the Shares' Net Asset Value

       8.           Redemption of Repurchase  . . . . . . . .    How to Sell Shares; Other Services
       9.           Pending Legal Proceedings . . . . . . . .    Not Applicable

                    Part B Item No. and Caption                  Statement of Additional Information Caption
                    ---------------------------                  -------------------------------------------
       10.          Cover page  . . . . . . . . . . . . . . .    Cover Page

       11.          Table of Contents . . . . . . . . . . . .    Table of Contents

       12.          General Information and History . . . . .    Not Applicable
       13.          Investment Objective and Policies . . . .    Investment Policies and Restrictions; Hedging Strategies;
                                                                 Portfolio Transactions

       14.          Management of the Fund  . . . . . . . . .    Trustees and Officers
       15.          Control Persons and Principal Holders of
                    Securities  . . . . . . . . . . . . . . .    Trustees and Officers

       16.          Investment Advisory and Other Services  .    Investment Advisory and Distribution Arrangements; Other
                                                                 Information

       17.          Brokerage Allocation  . . . . . . . . . .    Portfolio Transactions
       18.          Capital Stock and Other Securities  . . .    Other Information
<PAGE>






       19.          Purchase, Redemption and Pricing of          Valuation of Shares 
                    Securities Being Offered  . . . . . . . .

       20.          Tax Status  . . . . . . . . . . . . . . .    Taxes
       21.          Underwriters  . . . . . . . . . . . . . .    Investment Advisory and Distribution Arrangements

       22.          Calculation of Performance Data . . . . .    Performance Information

       23.          Financial Statements  . . . . . . . . . .    Financial Statements

     </TABLE>

     Part C

              Information required to  be included in Part C  is set forth under
     the  appropriate  item,  so  numbered,  in  Part  C  of  this  Registration
     Statement.
<PAGE>






                              PART C.  OTHER INFORMATION
                              --------------------------


     Item 24.  Financial Statements and Exhibits
                ---------------------------------

        
     (a)      Financial Statements:  (previously filed)


              PaineWebber Strategic Income Fund
              ---------------------------------

              Included in Part A of this Registration Statement:

                      Financial Highlights for  one Class A, Class B and Class C
                      share of  the Fund for  the fiscal year  ended January 31,
                      1996  and the fiscal  period February  7, 1994  to January
                      31, 1995.

              Included  in  Part  B   of  this  Registration  Statement  through
              incorporation   by   reference   from   the   Annual   Report   to
              Shareholders, previously  filed with  the Securities  and Exchange
              Commission  through  EDGAR  on   April  3,  1996,  (Accession  No.
              0000950130-96-001133):

                      Portfolio of Investments at January 31, 1996.

                      Statement of Assets and Liabilities at January 31, 1996.

                      Statement of Operations for the fiscal  year ended January
                      31, 1996.

                      Statement of  Changes in  Net Assets  for the fiscal  year
                      ended January 31,  1996 and the period February 7, 1994 to
                      January 31, 1995.

                      Notes to Financial Statements.

                      Financial Highlights for  one Class A, Class B and Class C
                      share of  the Fund for  the fiscal year  ended January 31,
                      1996 and the period February 7, 1994 to January 31, 1995.

                      Report of  Price Waterhouse  LLP, Independent Accountants,
                      dated March 22, 1996.
         

              PaineWebber Small Cap Fund
              --------------------------

              Included in Part A of this Registration Statement:

                                         C-1
<PAGE>






        
                      Financial Highlights for  one Class A, Class B and Class C
                      share of the  Fund for the  six months  ended January  31,
                      1996 (unaudited).
         

                      Financial Highlights for  one Class A, Class B and Class C
                      share  of the  Fund  for the  fiscal  year ended  July 31,
                      1995, the period  February 1, 1994  to July  31, 1994  and
                      the year ended January 31, 1994.

              Included  in  Part  B   of  this  Registration  Statement  through
              incorporation  by  reference   from  the  Semi-Annual  Report   to
              Shareholders,  as filed  with the  SEC through  EDGAR on  April 2,
              1996, Accession No. 0000950130-96-001115:

                      Portfolio of Investments at January 31, 1996 (unaudited).

                      Statement of  Assets and Liabilities  at January 31,  1996
                      (unaudited).

                      Statement  of  Changes in  Net Assets  for the  six months
                      ended January 31, 1996 (unaudited).

                      Statement of Operations  for the six months  ended January
                      31, 1996 (unaudited).

                      Notes to Financial Statements (unaudited).

                      Financial Highlights for  one Class A, Class B and Class C
                      share of the  Fund for the  six months  ended January  31,
                      1996 (unaudited).

              Included  in  Part  B   of  this  Registration  Statement  through
              incorporation by reference from  the Annual Report to Shareholders
              previously  filed  with  the  Securities  and Exchange  Commission
              through  EDGAR on  October 5,  1995 (Accession  No. 0000950130-95-
              001994):

                      Portfolio of Investments at July 31, 1995.

                      Statement of Assets and Liabilities at July 31, 1995.

                      Statement of  Operations for  the fiscal  year ended  July
                      31, 1995.

                      Statement  of Changes  in Net Assets  for the  fiscal year
                      ended July 31,  1995 and the  period February  1, 1994  to
                      July 31, 1994.

                      Notes to Financial Statements.


                                         C-2
<PAGE>






                      Financial Highlights for  one Class A, Class B and Class C
                      share  of the  Fund  for the  fiscal  year ended  July 31,
                      1995, the period  February 1, 1994  to July  31, 1994  and
                      the year ended January 31, 1994.

                      Report of  Price Waterhouse  LLP, Independent Accountants,
                      dated September 20, 1995.














































                                         C-3
<PAGE>






     (b)      Exhibits:  

              (1)     (a)      Declaration of Trust 1/
                      (b)      Amendment   effective   December   10,   1992  to
                               Declaration of Trust 2/
                      (c)      Amendment   effective   November   29,   1993  to
                               Declaration of Trust 6/
                      (d)      Amendment effective July  20, 1995 to Declaration
                               of Trust 13/
                      (e)      Amendment   effective   November   10,   1995  to
                               Declaration of Trust 13/
              (2)     (a)      By-Laws 1/
                      (b)      Amendment dated September 28, 1994 to By-Laws 8/
              (3)     Voting trust agreement - none
              (4)     Instruments   defining   the   rights   of   holders    of
                      Registrant's shares of beneficial interest 9/
              (5)     (a)      Investment  Advisory and  Administration Contract
                               4/
                      (b)      Fee  Agreement   with  respect   to   PaineWebber
                               Strategic Income Fund 6/ 
              (6)     (a)      Distribution  Contract with  respect to  Class  A
                               Shares 5/
                      (b)      Distribution  Contract with  respect  to  Class B
                               Shares 5/
                      (c)      Distribution  Contract  with  respect to  Class C
                               Shares 10/
                      (d)      Distribution  Contract with  respect to  Class  Y
                               Shares 13/
                      (e)      Exclusive Dealer Agreement  with respect to Class
                               A Shares 5/
                      (f)      Exclusive  Dealer Agreement with respect to Class
                               B Shares 5/
                      (g)      Exclusive Dealer Agreement with respect  to Class
                               C Shares 10/
                      (h)      Exclusive Dealer Agreement  with respect to Class
                               Y Shares 13/
              (7)     Bonus, profit sharing or pension plans - none
              (8)     Custodian Agreement 5/
              (9)     Form of Transfer Agency Agreement 7/
        
              (10)    (a)      Opinion  and consent  of  Kirkpatrick  & Lockhart
                               LLP, counsel to the  Registrant, with respect  to
                               Class A,  B and C shares of PaineWebber Small Cap
                               Fund 3/ 
         
                      (b)      Opinion  and  consent  of Kirkpatrick  & Lockhart
                               LLP, counsel to  the Registrant, with  respect to
                               Class A, B and  C shares of PaineWebber Strategic
                               Income Fund 5/
                      (c)      Opinion  and consent  of  Kirkpatrick  & Lockhart
                               LLP,  counsel to the Registrant,  with respect to
                               Class  Y shares  of PaineWebber  Strategic Income

                                         C-4
<PAGE>






                               Fund 13/
        
                      (d)      Opinion  and consent  of Kirkpatrick  &  Lockhart
                               LLP, counsel  to the Registrant, with  respect to
                               Class Y shares of PaineWebber Small Cap Fund 14/
              (11)    Other opinions, appraisals, rulings and consents:
                               Accountants' consents (previously filed)
         
              (12)    Financial Statements omitted from Part B - none
              (13)    Letter of investment intent 3/
              (14)    Prototype Retirement Plan - none
              (15)    (a)      Plan of Distribution pursuant  to Rule 12b-1 with
                               respect to Class A Shares 4/
                      (b)      Plan of Distribution pursuant to  Rule 12b-1 with
                               respect to Class B Shares 4/ 
                      (c)      Plan of Distribution pursuant to Rule  12b-1 with
                               respect to Class C Shares 4/ 
                      (d)      Addendum to Plan of Distribution pursuant to Rule
                               12b-1  with  respect   to  Class   C  Shares   of
                               PaineWebber Strategic Income Fund 6/ 
        
              (16)    (a)      Schedule    for   Computation    of   Performance
                               Quotations for PaineWebber Small Cap Fund 6/
         
                      (b)      Schedule of Computation of Performance Quotations
                               for PaineWebber Strategic Income Fund 8/
              (17) and
        
              (27)    Financial Data Schedule (previously filed)
         
              (18)    Plan Pursuant to Rule 18f-3 (filed herewith)

     _____________

     1/       Incorporated by reference from  Registrant's initial  Registration
              Statement, SEC File No. 33-55374, filed December 3, 1992.

     2/       Incorporated by  reference from  Pre-Effective Amendment No.  1 to
              the Registration  Statement, SEC File No.  33-55374, filed January
              7, 1993.

     3/       Incorporated by  reference from  Pre-Effective Amendment No.  2 to
              the Registration  Statement, SEC File No.  33-55374, filed January
              28, 1993.

     4/       Incorporated by  reference from Post-Effective Amendment  No. 1 to
              the Registration  Statement, SEC  File No. 33-55374,  filed August
              13, 1993.

     5/       Incorporated by  reference from Post-Effective Amendment  No. 2 to
              the Registration Statement, SEC  File No. 33-55374, filed November
              29, 1993.

     6/       Incorporated by  reference from Post-Effective Amendment  No. 3 to

                                         C-5
<PAGE>






              the  Registration Statement, SEC File No.  33-55374, filed June 1,
              1994.

     7/       Incorporated by  reference from Post-Effective Amendment  No. 6 to
              the Registration Statement, SEC  File No. 33-55374, filed December
              1, 1994.

     8/       Incorporated by  reference from Post-Effective Amendment  No. 7 to
              the Registration Statement, SEC  File No. 33-55374, filed  June 1,
              1995.

     9/       Incorporated  by reference from  Articles III, VIII, IX,  X and XI
              of   Registrant's  Declaration  of  Trust,  as  amended  effective
              December 10, 1992,  November 29, 1993, July 20, 1995  and November
              10, 1995,  and from  Articles II,  VII and  X of  Registrant's By-
              Laws, as amended September 28, 1994.

     10/      Incorporated by  reference from Post-Effective Amendment  No. 8 to
              the  Registration  Statement,   SEC  File   No.  33-55374,   filed
              November 14, 1995.

     11/      Incorporated by  reference from Post-Effective Amendment  No. 9 to
              the Registration Statement, SEC File No. 33-55474,  filed April 4,
              1996.

     12/      Incorporated by reference from  Post-Effective Amendment No. 10 to
              the  Registration   Statement,  SEC   File  No.  33-55474,   filed
              April 26, 1996.

     13/      Incorporated by reference from  Post-Effective Amendment No. 13 to
              the Registration Statement,  SEC File No. 33-55474,  filed May 31,
              1996.
        
     14/      Incorporated by reference from  Post-Effective Amendment No. 14 to
              the Registration Statement, SEC  File No. 33-55474, filed June 28,
              1996.
         

     Item 25.         Persons Controlled by or under Common Control with
                      --------------------------------------------------
     Registrant
     ----------

                      None









                                         C-6
<PAGE>






     Item 26.         Number of Holders of Securities
                      -------------------------------

     <TABLE>
     <CAPTION>


        

                                                            Number of Record Holders as of
               Title of Class                                       August 30, 1996
               --------------                                       ---------------

       <S>                                         <C>
               Shares of beneficial interest,
               par value $0.001 per share, in

               PaineWebber Small Cap Fund

                        Class A Shares                                       2,891
                        Class B Shares                                       4,704

                        Class C Shares                                       2,239
                        Class Y Shares                                         264



               PaineWebber Strategic Income Fund
                        Class A Shares                                         737

                        Class B Shares                                       2,428
                        Class C Shares                                       1,034

                        Class Y Shares                                           0

         
     </TABLE>

     Item 27.  Indemnification
                ---------------

              Section  3   of   Article  X   of  the   Declaration   of   Trust,
     "Indemnification," provides that  the appropriate series of  the Registrant
     will indemnify the trustees and  officers of the Registrant to  the fullest
     extent permitted by  law against claims  and expenses  asserted against  or
     incurred by  them by virtue of  being or having been  a trustee or officer;
     provided that no such person shall be  indemnified where there has been  an
     adjudication or other determination, as  described in Article X,  that such
     person  is  liable to  the  Registrant  or its  shareholders  by  reason of
     willful  misfeasance, bad faith, gross  negligence or reckless disregard of
     the duties involved in the conduct  of his or her office or did not  act in


                                         C-7
<PAGE>






     good  faith  in the  reasonable  belief that  his  action was  in  the best
     interest of the Registrant.  Section 3 of Article X also  provides that the
     Registrant  may  maintain  insurance  policies  covering   such  rights  of
     indemnification. 

              Additionally,  "Limitation  of  Liability"  in  Article X  of  the
     Declaration of  Trust  provides  that  the  trustees  or  officers  of  the
     Registrant shall  not be personally  liable to any  person extending credit
     to,  contracting  with or  having  a  claim  against the  Registrant  or  a
     particular series; and  that, provided they have  exercised reasonable care
     and have acted  under the reasonable belief  that their actions are  in the
     best interest  of the Registrant,  the trustees  and officers shall  not be
     liable for  neglect or wrongdoing by  them or any  officer, agent, employee
     or investment adviser of the Registrant.

              Section 2 of  Article XI of the Declaration of  Trust additionally
     provides that, subject to the provisions of Section 1  of Article XI and to
     Article  X,  trustees shall  not  be  liable  for  errors of  judgement  or
     mistakes of fact or law,  for any act or omission in accordance with advice
     of counsel  or other experts,  or for failing  to follow such advice,  with
     respect to the meaning and operation of the Declaration of Trust.

              Article IX  of  the  By-Laws  provides  that  the  Registrant  may
     purchase  and maintain insurance  on behalf of  any person who  is or was a
     trustee, officer or employee  of the  Registrant, or is  or was serving  at
     the  request of  the Registrant  as a  trustee,  officer or  employee of  a
     corporation, partnership, joint venture, trust or  other enterprise against
     any liability  asserted  against  him  and  incurred by  him  in  any  such
     capacity  or  arising out  of  his  status  as  such, whether  or  not  the
     Registrant would have the  power to indemnify him against such liability to
     the Registrant  or its shareholders,  provided that the  Registrant may not
     purchase or  maintain insurance that  protects any such  person against any
     liability  to which  he  would otherwise  be subject  by reason  of willful
     misfeasance,  bad faith,  gross negligence,  or reckless  disregard  of the
     duties involved in the conduct of his office.

              Section 9  of the Investment Advisory  and Administration Contract
     with  Mitchell   Hutchins  Asset  Management  Inc.   ("Mitchell  Hutchins")
     provides that  Mitchell   Hutchins shall  not be  liable for  any error  of
     judgment or  mistake of law or for  any loss suffered by  any series of the
     Registrant in  connection with the  matters to which  the Contract relates,
     except for  a loss resulting  from the willful  misfeasance, bad faith,  or
     gross negligence of Mitchell Hutchins  in the performance of its duties  or
     from  its  reckless disregard  of  its  obligations  and  duties under  the
     Contract.  Section 10  of the Contract provides that the Trustees shall not
     be  liable for  any  obligations  of the  Trust  or  any series  under  the
     Contract  and that  Mitchell Hutchins  shall look  only to  the  assets and
     property of the Registrant in settlement of  such right or claim and not to
     the assets and property of the Trustees.

              Section  9 of  each Distribution Contract provides  that the Trust
     will  indemnify   Mitchell  Hutchins  and   its  officers,  directors   and

                                         C-8
<PAGE>






     controlling  persons  against  all liabilities  arising  from  any  alleged
     untrue statement of  material fact in  the Registration  Statement or  from
     any alleged  omission to  state in  the Registration  Statement a  material
     fact required  to be stated in  it or necessary  to make the  statements in
     it,  in  light  of  the  circumstances  under which  they  were  made,  not
     misleading,  except insofar as liability  arises from  untrue statements or
     omissions  made  in  reliance  upon  and  in  conformity  with  information
     furnished by  Mitchell Hutchins to  the Trust for  use in  the Registration
     Statement; and  provided that  this indemnity  agreement shall  not protect
     any such persons against liabilities arising by reason  of their bad faith,
     gross  negligence  or willful  misfeasance;  and  shall  not  inure to  the
     benefit of  any such persons  unless a  court of competent  jurisdiction or
     controlling  precedent determines  that such  result is  not against public
     policy  as expressed  in the  Securities Act of  1933.   Section 9  of each
     Distribution  Contract  also  provides that  Mitchell  Hutchins  agrees  to
     indemnify,  defend and hold  the Trust, its officers  and Trustees free and
     harmless of any claims  arising out of any alleged untrue statement  or any
     alleged omission  of material  fact contained  in information  furnished by
     Mitchell  Hutchins for use in the Registration  Statement or arising out of
     an agreement  between Mitchell Hutchins  and any retail  dealer, or arising
     out of  supplementary literature or  advertising used by Mitchell  Hutchins
     in connection with the Contract.  Section 10 of each  Distribution Contract
     contains provisions  similar to Section  10 of the  Investment Advisory and
     Administration   Contract,   with  respect   to   Mitchell   Hutchins   and
     PaineWebber, as appropriate.

              Section 9  of each Exclusive Dealer  Agreement contains provisions
     similar  to  Section 9  of  each  Distribution  Contract,  with respect  to
     PaineWebber Incorporated ("PaineWebber").

              Insofar  as  indemnification  for  liabilities  arising under  the
     Securities Act of 1933, as  amended, may be provided to trustees,  officers
     and  controlling  persons of  the  Registrant,  pursuant  to the  foregoing
     provisions or  otherwise,  the Registrant  has  been  advised that  in  the
     opinion of the  Securities and Exchange Commission such  indemnification is
     against  public  policy   as  expressed  in  the  Act  and  is,  therefore,
     unenforceable.  In the event that a  claim for indemnification against such
     liabilities (other than  the payment by the Registrant of expenses incurred
     or paid by  a trustee, officer or  controlling person of the  Registrant in
     connection with  the successful defense  of any action,  suit or proceeding
     or payment  pursuant  to any  insurance  policy)  is asserted  against  the
     Registrant by  such trustee, officer  or controlling  person in  connection
     with the  securities being registered,  the Registrant will,  unless in the
     opinion  of  its  counsel  the  matter  has  been  settled  by  controlling
     precedent, submit  to  a court  of  appropriate jurisdiction  the  question
     whether such  indemnification by it  is against public  policy as expressed
     in the Act and will be governed by the final adjudication of such issue. 

     Item 28.  Business and Other Connections of Investment Adviser
                ----------------------------------------------------

              Mitchell  Hutchins,  a   Delaware  corporation,  is  a  registered

                                         C-9
<PAGE>






     investment adviser  and is a  wholly owned subsidiary  of PaineWebber which
     is, in  turn,  a  wholly  owned  subsidiary  of  Paine  Webber  Group  Inc.
     Mitchell  Hutchins  is   primarily  engaged  in  the   investment  advisory
     business.    Information as  to  the  officers  and  directors of  Mitchell
     Hutchins is  included in  its Form ADV,  as filed  with the Securities  and
     Exchange Commission  (registration number 801-13219),  and is  incorporated
     herein by reference.

     Item 29.  Principal Underwriters
                ----------------------

              a)    Mitchell Hutchins  serves  as  principal  underwriter and/or
     investment adviser for the following investment companies:

        
              ALL AMERICAN TERM TRUST INC.
              GLOBAL HIGH INCOME DOLLAR FUND INC.
              GLOBAL SMALL CAP FUND INC.
              INSURED MUNICIPAL INCOME FUND INC.
              INVESTMENT GRADE INCOME FUND INC.
              MANAGED HIGH YIELD FUND INC.
              PAINEWEBBER AMERICA FUND
              PAINEWEBBER FINANCIAL SERVICES GROWTH FUND INC.
              PAINEWEBBER INVESTMENT SERIES
              PAINEWEBBER INVESTMENT TRUST
              PAINEWEBBER INVESTMENT TRUST II
              PAINEWEBBER MANAGED ASSETS TRUST
              PAINEWEBBER MANAGED INVESTMENTS TRUST
              PAINEWEBBER MASTER SERIES, INC.
              PAINEWEBBER MUNICIPAL SERIES
              PAINEWEBBER MUTUAL FUND TRUST
              PAINEWEBBER OLYMPUS FUND
              PAINEWEBBER SECURITIES TRUST
              PAINEWEBBER SERIES TRUST
              STRATEGIC GLOBAL INCOME FUND, INC.
              TRIPLE A AND GOVERNMENT SERIES - 1997, INC.
              2002 TARGET TERM TRUST INC.
         

              b)   Mitchell Hutchins is the  Registrant's principal underwriter.
     PaineWebber  acts as  exclusive  dealer of  the  Registrant's shares.   The
     directors  and officers  of  Mitchell  Hutchins, their  principal  business
     addresses,  and  their positions  and  offices with  Mitchell  Hutchins are
     identified  in its  Form  ADV, as  filed with  the Securities  and Exchange
     Commission (registration number 801-13219).  The directors and  officers of
     PaineWebber, their  principal business addresses,  and their positions  and
     offices with PaineWebber are identified in its Form  ADV, as filed with the
     Securities and  Exchange Commission  (registration number  801-7163).   The
     foregoing  information  is hereby  incorporated herein  by reference.   The
     information set forth below is  furnished for those directors  and officers
     of Mitchell  Hutchins or PaineWebber who also serve as trustees or officers
     of the Registrant:

                                         C-10
<PAGE>







     <TABLE>
     <CAPTION>
                 Name and Principal              Positions and Offices           Positions and Offices With
                 Business Address                   With Registrant            Underwriter or Exclusive Dealer
                  ----------------                  ---------------            -------------------------------

       <S>                                     <C>                         <C>
       Margo N. Alexander                      Trustee and President       President, Chief Executive Officer and
       1285 Avenue of the Americas             (Chief Executive            a director of Mitchell Hutchins;
       New York, NY  10019                     Officer)                    Executive Vice President and a
                                                                           director of PaineWebber

       Mary C. Farrell                         Trustee                     Managing Director, Senior Investment
       1285 Avenue of the Americas                                         Strategist and Member of the
       New York, NY  10019                                                 Investment Policy Committee of
                                                                           PaineWebber

       Teresa M. Boyle                         Vice President              First Vice President and Manager -
       1285 Avenue of the Americas                                         Advisory Administration of Mitchell
       New York, NY 10019                                                  Hutchins
       Donald R. Jones                         Vice President              First Vice President and a Portfolio
       1285 Avenue of the Americas                                         Manager of Mitchell Hutchins
       New York, NY  10019

       Thomas J. Libassi                       Vice President              Senior Vice President and a Portfolio
       1285 Avenue of the Americas                                         Manager of Mitchell Hutchins
       New York, NY 10019
       C. William Maher                        Vice President and          First Vice President and a Senior
       1285 Avenue of the Americas             Assistant Treasurer         Manager of the Mutual Fund Finance
       New York, NY 10019                                                  Division of Mitchell Hutchins

       Dennis McCauley                         Vice President              Managing Director and Chief Investment
       1285 Avenue of the Americas                                         Officer - Fixed Income of Mitchell
       New York, NY 10019                                                  Hutchins

       Ann E. Moran                            Vice President and          Vice President of Mitchell Hutchins
       1285 Avenue of the Americas             Assistant Treasurer
       New York, NY 10019
       Dianne E. O'Donnell                     Vice President and          Senior Vice President and Deputy
       1285 Avenue of the Americas             Secretary                   General Counsel of Mitchell Hutchins
       New York, NY  10019

       Victoria E. Schonfeld                   Vice President              Managing Director and General Counsel
       1285 Avenue of the Americas                                         of Mitchell Hutchins
       New York, NY  10019
       Paul H. Schubert                        Vice President and          First Vice President and a Senior
       1285 Avenue of the Americas             Assistant Treasurer         Manager of the Mutual Fund Finance
       New York, NY  10019                                                 Division of Mitchell Hutchins




                                                                     C-11
<PAGE>






                 Name and Principal              Positions and Offices           Positions and Offices With
                 Business Address                   With Registrant            Underwriter or Exclusive Dealer
                  ----------------                  ---------------            -------------------------------

       <S>                                     <C>                         <C>
       Nirmal Singh                            Vice President              First Vice President and a Portfolio
       1285 Avenue of the Americas                                         Manager of Mitchell Hutchins
       New York, NY 10019

       Julian F. Sluyters                      Vice President and          Senior Vice President and Director of
       1285 Avenue of the Americas             Treasurer                   the Mutual Fund Finance Division of
       New York, NY  10019                                                 Mitchell Hutchins

       Mark A. Tincher                         Vice President              Managing Director and Chief Investment
       1285 Avenue of the Americas                                         Officer - U.S. Equity Investments of
       New York, NY  10019                                                 Mitchell Hutchins
       Craig Varrelman                         Vice President              First Vice President and a Portfolio
       1285 Avenue of the Americas                                         Manager of Mitchell Hutchins
       New York, NY  10019

       Stuart Waugh                            Vice President              Managing Director and a Portfolio
       1285 Avenue of the Americas                                         Manager of Mitchell Hutchins
       New York, NY  10019
       Keith A. Weller                         Vice President and          First Vice President and Associate
       1285 Avenue of the Americas             Assistant Secretary         General Counsel of Mitchell Hutchins
       New York, NY  10019

     </TABLE>

              c)  None

     Item 30.  Location of Accounts and Records
                --------------------------------

              The books and other  documents required by paragraphs (b)(4),  (c)
     and  (d) of  Rule  31a-1  under the  Investment  Company  Act of  1940  are
     maintained in the  physical possession of Registrant's  Investment Adviser,
     Mitchell  Hutchins, 1285 Avenue of the Americas,  New York, New York 10019.
     All other  accounts,  books  and  documents  required  by  Rule  31a-1  are
     maintained in  the physical possession  of Registrant's transfer agent  and
     custodian.

     Item 31.  Management Services
                -------------------

              Not applicable.







                                         C-12
<PAGE>






     Item 32.  Undertakings
                ------------

              Registrant hereby  undertakes to  furnish each  person  to whom  a
     prospectus  is delivered  with  a copy  of  the Registrant's  latest annual
     report to shareholders upon request and without charge.















































                                         C-13
<PAGE>







                                     SIGNATURES

              Pursuant to the requirements of the Securities Act of 1933 and
     the Investment Company Act of 1940, the Registrant certifies that it meets
     all the requirements for effectiveness of this Post-Effective Amendment to
     its Registration Statement pursuant to Rule 485(b) under the Securities
     Act of 1933 and has duly caused this Post-Effective Amendment to be signed
     on its behalf by the undersigned, thereunto duly authorized, in the City
     of New York and State of New York, on the 20th day of September, 1996.

                                       PAINEWEBBER SECURITIES TRUST

                                       By:  /s/ Dianne E. O'Donnell         
                                           ---------------------------------
                                                Dianne E. O'Donnell
                                                Vice President and Secretary

              Pursuant to the requirements of the Securities Act of 1933, this
     Post-Effective Amendment has been signed below by the following persons in
     the capacities and on the dates indicated:

     <TABLE>
     <CAPTION>

       Signature                                         Title                               Date
       ---------                                         -----                               ----

       <S>                                               <C>                                 <C>
       /s/ Margo N. Alexander                            President and Trustee               September 20, 1996
       -----------------------------                     (Chief Executive Officer)
       Margo N. Alexander *

       /s/ E. Garrett Bewkes, Jr.                        Trustee and Chairman                September 20, 1996
       -----------------------------                     of the Board of Trustees
       E. Garrett Bewkes, Jr. *

       /s/ Richard Q. Armstrong                          Trustee                             September 20, 1996
       -----------------------------
       Richard Q. Armstrong *
       /s/ Richard R. Burt                               Trustee                             September 20, 1996
       -----------------------------
       Richard R. Burt *

       /s/ Mary C. Farrell                               Trustee                             September 20, 1996
       -----------------------------
       Mary C. Farrell *
       /s/ Meyer Feldberg                                Trustee                             September 20, 1996
       -----------------------------
       Meyer Feldberg *

       /s/ George W. Gowen                               Trustee                             September 20, 1996
       -----------------------------
       George W. Gowen *
<PAGE>






       /s/ Frederic V. Malek                             Trustee                             September 20, 1996
       -----------------------------
       Frederic V. Malek *

       /s/ Carl W. Schafer                               Trustee                             September 20, 1996
       -----------------------------
       Carl W. Schafer *
       /s/ John R. Torell III                            Trustee                             September 20, 1996
       -----------------------------
       John R. Torell III *

       /s/ Julian F. Sluyters                            Vice President and Treasurer        September 20, 1996
       -----------------------------                     (Chief Financial and Accounting
       Julian F. Sluyters                                Officer)

     </TABLE>

                                SIGNATURES (Continued)

     *        Signature affixed by Elinor W. Gammon pursuant to power of
              attorney dated May 21, 1996 and incorporated by reference from
              Post-Effective Amendment No. 30 to the registration statement of
              PaineWebber Managed Municipal Trust, SEC File No. 2-89016, filed
              June 27, 1996.
<PAGE>






                             PAINEWEBBER SECURITIES TRUST
                                    EXHIBIT INDEX
                                    -------------
     Exhibit
     Number
     ------

     (b)      Exhibits:  

              (1)     (a)      Declaration of Trust 1/
                      (b)      Amendment   effective   December   10,   1992  to
                               Declaration of Trust 2/
                      (c)      Amendment   effective   November   29,   1993  to
                               Declaration of Trust 6/
                      (d)      Amendment effective July 20, 1995  to Declaration
                               of Trust 13/
                      (e)      Amendment   effective   November   10,   1995  to
                               Declaration of Trust 13/
              (2)     (a)      By-Laws 1/
                      (b)      Amendment dated September 28, 1994 to By-Laws 8/
              (3)     Voting trust agreement - none
              (4)     Instruments   defining    the   rights   of   holders   of
                      Registrant's shares of beneficial interest 9/
              (5)     (a)      Investment  Advisory and  Administration Contract
                               4/
                      (b)      Fee  Agreement   with  respect   to   PaineWebber
                               Strategic Income Fund 6/ 
              (6)     (a)      Distribution  Contract  with  respect to  Class A
                               Shares 5/
                      (b)      Distribution  Contract with  respect to  Class  B
                               Shares 5/
                      (c)      Distribution  Contract with  respect  to  Class C
                               Shares 10/
                      (d)      Distribution  Contract  with  respect to  Class Y
                               Shares 13/
                      (e)      Exclusive Dealer Agreement with respect  to Class
                               A Shares 5/
                      (f)      Exclusive Dealer Agreement  with respect to Class
                               B Shares 5/
                      (g)      Exclusive  Dealer Agreement with respect to Class
                               C Shares 10/
                      (h)      Exclusive Dealer Agreement with respect  to Class
                               Y Shares 13/
              (7)     Bonus, profit sharing or pension plans - none
              (8)     Custodian Agreement 5/
              (9)     Form of Transfer Agency Agreement 7/

        
              (10)    (a)      Opinion  and  consent  of Kirkpatrick  & Lockhart
                               LLP, counsel  to the Registrant,  with respect to
                               Class A, B and C shares of PaineWebber Small  Cap
                               Fund 3/ 
         
                      (b)      Opinion  and consent  of Kirkpatrick  &  Lockhart
<PAGE>






                               LLP, counsel  to the Registrant,  with respect to
                               Class A, B and  C shares of PaineWebber Strategic
                               Income Fund 5/
                      (c)      Opinion  and  consent  of Kirkpatrick  & Lockhart
                               LLP, counsel to  the Registrant, with  respect to
                               Class  Y shares  of PaineWebber  Strategic Income
                               Fund 13/
        
                      (d)      Opinion  and consent  of Kirkpatrick  &  Lockhart
                               LLP, counsel  to the Registrant,  with respect to
                               Class Y shares of PaineWebber Small Cap Fund 14/
              (11)    Other opinions, appraisals, rulings and consents:
                               Accountants' consents (previously filed)
         
              (12)    Financial Statements omitted from Part B - none
              (13)    Letter of investment intent 3/
              (14)    Prototype Retirement Plan - none
              (15)    (a)      Plan of Distribution pursuant to Rule 12b-1  with
                               respect to Class A Shares 4/
                      (b)      Plan  of Distribution pursuant to Rule 12b-1 with
                               respect to Class B Shares 4/ 
                      (c)      Plan of Distribution  pursuant to Rule 12b-1 with
                               respect to Class C Shares 4/ 
                      (d)      Addendum to Plan of Distribution pursuant to Rule
                               12b-1   with  respect   to  Class  C   Shares  of
                               PaineWebber Strategic Income Fund 6/ 
        
              (16)    (a)      Schedule    for   Computation    of   Performance
                               Quotations for PaineWebber Small Cap Fund 6/
         
                      (b)      Schedule of Computation of Performance Quotations
                               for PaineWebber Strategic Income Fund 8/
        
              (17) and
              (27)    Financial Data Schedule (previously filed)
              (18)    Plan Pursuant to Rule 18f-3 (filed herewith)
         

     _____________

     1/       Incorporated by  reference from  Registrant's initial Registration
              Statement, SEC File No. 33-55374, filed December 3, 1992.

     2/       Incorporated by  reference from  Pre-Effective Amendment No.  1 to
              the Registration  Statement, SEC File No.  33-55374, filed January
              7, 1993.

     3/       Incorporated by  reference from  Pre-Effective Amendment No.  2 to
              the Registration  Statement, SEC File No.  33-55374, filed January
              28, 1993.

     4/       Incorporated by  reference from Post-Effective Amendment  No. 1 to
              the Registration  Statement, SEC  File No. 33-55374,  filed August
              13, 1993.
<PAGE>






     5/       Incorporated by  reference from Post-Effective Amendment  No. 2 to
              the Registration Statement, SEC  File No. 33-55374, filed November
              29, 1993.

     6/       Incorporated by  reference from Post-Effective Amendment  No. 3 to
              the Registration  Statement, SEC File No. 33-55374,  filed June 1,
              1994.

     7/       Incorporated by  reference from Post-Effective Amendment  No. 6 to
              the Registration Statement, SEC  File No. 33-55374, filed December
              1, 1994.

     8/       Incorporated by  reference from Post-Effective Amendment  No. 7 to
              the Registration Statement, SEC File  No. 33-55374, filed June  1,
              1995.

     9/       Incorporated  by reference from  Articles III, VIII, IX,  X and XI
              of  Registrant's  Declaration  of  Trust,  as  amended   effective
              December 10, 1992,  November 29, 1993, July 20, 1995  and November
              10, 1995,  and from  Articles II,  VII and  X of  Registrant's By-
              Laws, as amended September 28, 1994.

     10/      Incorporated by  reference from Post-Effective Amendment  No. 8 to
              the Registration Statement, SEC  File No. 33-55374, filed November
              14, 1995.

     11/      Incorporated by  reference from Post-Effective Amendment  No. 9 to
              the Registration Statement, SEC File No. 33-55474, filed  April 4,
              1996.

     12/      Incorporated by reference from  Post-Effective Amendment No. 10 to
              the  Registration Statement,  SEC File  No. 33-55474,  filed April
              26, 1996.

     13/      Incorporated by reference from  Post-Effective Amendment No. 13 to
              the Registration Statement, SEC  File No. 33-55474, filed  May 31,
              1996.

        
     14/      Incorporated by reference from  Post-Effective Amendment No. 14 to
              the Registration Statement, SEC File No. 33-55474,  filed June 28,
              1996.
         
<PAGE>

<PAGE>
                                                                      EXHIBIT 18



                             PAINEWEBBER SECURITIES TRUST
                      MULTIPLE CLASS PLAN PURSUANT TO RULE 18f-3

              PaineWebber Securities Trust hereby adopts this amended and
     restated Multiple Class Plan pursuant to Rule 18f-3 under the Investment
     Company Act of 1940, as amended ("1940 Act") on behalf of its current
     operating series, PaineWebber Small Cap Fund and PaineWebber Strategic
     Income Fund, and any series that may be established in the future
     (referred to hereinafter collectively as the "Funds" and individually as a
     "Fund").  

     A.       GENERAL DESCRIPTION OF CLASSES THAT ARE OFFERED:
              -----------------------------------------------

              1.      CLASS A SHARES.    Class A shares of each Fund are sold
     to the general public subject to an initial sales charge.  The initial
     sales charge for each Fund is waived for certain eligible purchasers and
     reduced or waived for certain large volume purchases.

              The maximum sales charge is 4% of the public offering price for
     Class A shares of a Fund that invests primarily in debt securities.

              The maximum sales charge is 4.5% of the public offering price for
     Class A shares of a Fund that invests primarily in equity securities or a
     combination of equity and debt securities.

              Class A shares of each Fund are subject to an annual service fee
     of .25% of the average daily net assets of the Class A shares of each Fund
     paid pursuant to a plan of distribution adopted pursuant to Rule 12b-1
     under the 1940 Act.

              Class A shares of each Fund will be subject to a contingent
     deferred sales charge ("CDSC") on redemptions of shares (i) purchased
     without an initial sales charge due to a sales charge waiver for purchases
     of $1 million or more and (ii) held less than one year.  The Class A CDSC
     is equal to 1% of the lower of: (i) the net asset value of the shares at
     the time of purchase or (ii) the net asset value of the shares at the time
     of redemption.  Class A shares of each Fund held one year or longer and
     Class A shares of each Fund acquired through reinvestment of dividends or
     capital gains distributions on shares otherwise subject to a Class A CDSC
     are not subject to the CDSC.  The CDSC for Class A shares of each Fund
     shall not apply to shares purchased prior to November 10, 1995 and will be
     waived under certain circumstances.

              2.      CLASS B SHARES.    Class B shares of each Fund are sold
     to the general public subject to a CDSC, but without imposition of an
     initial sales charge.  

              The maximum CDSC for Class B shares of each Fund is equal to 5%
     of the lower of: (i) the net asset value of the shares at the time of
<PAGE>






     PaineWebber Securities Trust
     Multiple Class Plan
     Page 2


     purchase or (ii) the net asset value of the shares at the time of
     redemption.  

              Class B shares of each Fund held six years or longer and Class B
     shares of each Fund acquired through reinvestment of dividends or capital
     gains distributions are not subject to the CDSC.

              Class B shares of each Fund are subject to an annual service fee
     of .25% of average daily net assets and a distribution fee of .75% of
     average daily net assets of the Class B shares of each Fund, each paid
     pursuant to a plan of distribution adopted pursuant to Rule 12b-1 under
     the 1940 Act.

              Class B shares of each Fund convert to Class A shares
     approximately six years after issuance at relative net asset value.

              3.      CLASS C SHARES.    Class C shares of each Fund are sold
     to the general public without imposition of a sales charge.

              Class C shares of a Fund that invests primarily in equity
     securities or a combination of equity and debt securities are subject to
     an annual service fee of .25% of average daily net assets and a
     distribution fee of .75% of average daily net assets of Class C shares of
     such Fund, each pursuant to a plan of distribution adopted pursuant to
     Rule 12b-1 under the 1940 Act.

              Class C shares of a Fund that invests primarily in debt
     securities are subject to an annual service fee of .25% of average daily
     net assets and a distribution fee of .50% of average daily net assets of
     Class C shares of such Fund, each pursuant to a plan of distribution
     adopted pursuant to Rule 12b-1 under the 1940 Act.

              Class C shares of a Fund that invests primarily in debt
     securities will be subject to a CDSC on redemptions of Class C shares held
     less than one year equal to .75% of the lower of: (i) the net asset value
     of the shares at the time of purchase or (ii) the net asset value of the
     shares at the time of redemption; provided that such CDSC shall not apply
     to Class C shares purchased prior to November 10, 1995.  

              Class C shares of a Fund that invests primarily in equity
     securities or in a combination of equity and debt securities will be
     subject to a CDSC on redemptions of Class C shares held less than one year
     equal to 1% of the lower of: (i) the net asset value of the shares at the
     time of purchase or (ii) the net asset value of the shares at the time of
     redemption; provided that such CDSC shall not apply to Class C shares
     purchased prior to November 10, 1995.  

              Class C shares of each Fund held one year or longer and Class C
     shares of each Fund acquired through reinvestment of dividends or capital
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     PaineWebber Securities Trust
     Multiple Class Plan
     Page 3


     gains distributions are not subject to the CDSC.  The CDSC for Class C
     shares of each Fund will be waived under certain circumstances.

              4.      CLASS Y SHARES.   Class Y shares are sold without
     imposition of an initial sales charge or CDSC and are not subject to any
     service or distribution fees.
      
              Class Y shares of each Fund are available for purchase only by:
     (i) employee benefit and retirement plans, other than individual
     retirement accounts and self-employed retirement plans, of Paine Webber
     Group Inc. and its affiliates; (ii) certain unit investment trusts
     sponsored by PaineWebber Incorporated ("PaineWebber"); (iii) participants
     in certain investment programs that are currently, or will in the future
     be, sponsored by PaineWebber or its affiliates and that charge a separate
     fee for program services, provided that shares are purchased through or in
     connection with such programs; (iv) the holders of Class Y shares of any
     former Mitchell Hutchins/Kidder Peabody ("MH/KP") mutual fund, provided
     that such shares are issued in connection with the reorganization of a
     MH/KP mutual fund into that Fund; (v) investors purchasing $10,000,000 or
     more at one time in any combination of PaineWebber proprietary funds in
     the Flexible Pricing System; (vi) an employee benefit plan qualified under
     section 401 (including a salary reduction plan qualified under section
     401(k)) or section 403(b) of the Internal Revenue Code (each an "employee
     benefit plan"), provided that such employee benefit plan has 5,000 or more
     eligible employees; (vii) an employee benefit plan with assets of
     $50,000,000 or more; and (viii) any investment company advised by
     PaineWebber or its affiliates.


     B.       EXPENSE ALLOCATIONS OF EACH CLASS:
              ---------------------------------

              Certain expenses may be attributable to a particular Class of
     shares of each Fund ("Class Expenses").  Class Expenses are charged
     directly to the net assets of the particular Class and, thus, are borne on
     a pro rata basis by the outstanding shares of that Class.

              In addition to the distribution and service fees described above,
     each Class may also pay a different amount of the following other
     expenses:

                      (1)      printing and postage expenses related to
                               preparing and distributing materials
                               such as shareholder reports,
                               prospectuses, and proxies to current
                               shareholders of a specific Class;

                      (2)      Blue Sky registration fees incurred by a specific
                               Class of shares;
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     PaineWebber Securities Trust
     Multiple Class Plan
     Page 4


                      (3)      SEC registration fees incurred by a specific
                               Class of shares;

                      (4)      expenses of administrative personnel and services
                               required to support the shareholders of a
                               specific Class of shares;

                      (5)      Trustees' fees incurred as a result of issues
                               relating to a specific Class of shares;

                      (6)      litigation expenses or other legal expenses
                               relating to a specific Class of shares; and  

                      (7)      transfer agent fees identified as being
                               attributable to a specific Class.

     C.       EXCHANGE PRIVILEGES:
              -------------------

              Class A, Class B and Class C shares of each Fund may be exchanged
     for shares of the corresponding Class of other PaineWebber mutual funds
     and MH/KP mutual funds, or may be acquired through an exchange of shares
     of the corresponding Class of those funds.  Class Y shares of the Funds
     are not exchangeable.

              These exchange privileges may be modified or terminated by a
     Fund, and exchanges may only be made into funds that are legally
     registered for sale in the investor's state of residence.

     D.       CLASS DESIGNATION:
              -----------------

              Subject to approval by the Board of Trustees of PaineWebber
     Securities Trust, a Fund may alter the nomenclature for the designations
     of one or more of its classes of shares.


     E.       ADDITIONAL INFORMATION:
              ----------------------

              This Multiple Class Plan is qualified by and subject to the terms
     of the then current prospectus for the applicable Classes; provided,
     however, that none of the terms set forth in any such prospectus shall be
     inconsistent with the terms of the Classes contained in this Plan.  The
     prospectus for each Fund contains additional information about the Classes
     and each Fund's multiple class structure.
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     PaineWebber Securities Trust
     Multiple Class Plan
     Page 5


     F.       DATE OF EFFECTIVENESS:
              ---------------------

              This Multiple Class Plan is effective as of the date hereof,
     provided that this Plan shall not become effective with respect to any
     Fund unless such action has first been approved by the vote of a majority
     of the Board and by vote of a majority of those trustees of the Fund who
     are not interested persons of PaineWebber Securities Trust.



                                                July 24, 1996
<PAGE>


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