As filed with the Securities and Exchange Commission on March 29, 2001

                                                Registration No. 333-___________

================================================================================


                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

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

                                    FORM S-8

                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

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

                                     UBS AG
             (Exact name of registrant as specified in its charter)

         Switzerland                                             98-0186363
(State or other jurisdiction of                               (I.R.S. Employer
incorporation or organization)                               Identification No.)

                   Bahnhofstrasse 45, Zurich, Switzerland, and
                      Aeschenvorstadt 1, Basel, Switzerland
                    (Address of Principal Executive Offices)


                         UBS Savings and Investment Plan
                            (Full title of the Plan)


                           Robert C. Dinerstein, Esq.
                                     UBS AG
                                  299 Park Ave.
                            New York, New York 10171
                                 (212) 821-3000
            (Name, address and telephone number of agent for service)


================================================================================
<PAGE>
                         CALCULATION OF REGISTRATION FEE

<TABLE>
<CAPTION>
===================================================================================================================

Title of securities     Amount to be         Proposed maximum      Proposed maximum      Amount of
to be registered        registered           offering price per    aggregate offering    registration fee
                                             unit                  price
<S>                     <C>                  <C>                   <C>                      <C>
Ordinary Shares, par    1,000,000(1)                (2)            $134,900,000(2)          $33,725
value CHF 10

===================================================================================================================
</TABLE>
(1)  Consists  of  Ordinary  Shares  to be  issued  under  the UBS  Savings  and
     Investment  Plan (the "Plan").  In addition,  pursuant to Rule 416(c) under
     the  Securities  Act of 1933,  this  Registration  Statement also covers an
     indeterminate  amount of  interests  to be offered or sold  pursuant to the
     Plan.  Such  indeterminate  number of additional  shares as may be issuable
     pursuant to a  recapitalization  of the  Ordinary  Shares under the Plan is
     hereby also registered.

(2)  Computed  pursuant to Rule 457(h) solely for the purpose of determining the
     registration  fee, based upon an assumed price of $134.90 per share,  which
     was the  average  of the high and low prices of UBS AG  Ordinary  Shares on
     March 23,  2001,  as reported on the New York Stock  Exchange  Consolidated
     Tape.


<PAGE>
                                    PART II

               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

Item 3.  Incorporation of Documents by Reference

         Incorporated  by  reference  in  this  Registration  Statement  are the
following  documents  heretofore  filed  by  UBS AG  (the  "Company")  with  the
Securities and Exchange Commission (the "Commission") pursuant to the Securities
Exchange Act of 1934, as amended (the "Exchange Act"):

         a.  The  Company's  Annual  Report  on Form  20-F  for the  year  ended
             December 31, 2000 filed pursuant to the Exchange Act;

         b.  All other reports filed by the Company  pursuant to sections  13(a)
             or 15(d) of the  Exchange  Act  since  the end of the  fiscal  year
             covered by the annual report referred to in (a) above; and

         c.  The description of the Company's  Ordinary Shares, par value CHF 10
             per share  (the  "Ordinary  Shares"),  contained  in the  Company's
             Annual  Report on Form 20-F  filed  with the  Commission  on May 9,
             2000,  pursuant to the Exchange Act (Registration  No.  001150226),
             and any  amendment or report filed for the purpose of updating such
             description.

         All documents  subsequently  filed by the Company  pursuant to sections
13(a),  13(c),  14 or 15(d)  of the  Exchange  Act,  prior  to the  filing  of a
post-effective  amendment that indicates that all securities offered hereby have
been sold or that deregisters all such securities then remaining  unsold,  shall
be deemed to be incorporated by reference in this Registration  Statement and to
be part hereof from the dates of filing of such documents.

         Any  statement  contained  in a document  incorporated  or deemed to be
incorporated  by reference  herein shall be deemed to be modified or  superseded
for  purposes  of this  registration  statement  to the extent  that a statement
contained  herein (or in any other  subsequently  filed  document  which also is
incorporated  or deemed to be  incorporated  by  reference  herein)  modified or
supersedes  such statement.  Any such statement so modified or superseded  shall
not be deemed, except as so modified or superseded, to constitute a part of this
registration statement.

Item 4.  Description of Securities

         Not applicable.

Item 5.  Interests of Named Experts and Counsel

         None.

Item 6.  Indemnification of Directors and Officers

         Under Swiss law,  directors and senior  officers acting in violation of
their  statutory  duties -  whether  dealing  with bona fide  third  parties  or
performing  any other acts on behalf of the  corporation  - may become liable to
the corporation, its shareholders and (in bankruptcy) its creditors for damages.
The directors'  liability is joint and several but only to the extent the damage
is  attributable  to each  director  based on willful or negligent  violation of
duty.  If the  board of  directors  lawfully  delegated  the  power to carry out
day-to-day  management to a different corporate body, e.g., the executive board,
the board of directors is not vicariously  liable for the acts of the members of
the executive board.  Instead the directors can be held liable for their failure
to properly  select,  instruct or supervise  the  executive  board  members.  If
directors  and officers  enter into a transaction  on behalf of the  corporation
with bona fide  third  parties  in  violation  of their  statutory  duties,  the
transaction  is  nevertheless  valid  as  long  as it is  not  excluded  by  the
corporation's business purpose.

         Under Swiss law, a  corporation  may indemnify a director or officer of
the  corporation  against  losses and  expenses  (unless  arising from his gross
negligence or willful misconduct),  including attorney's fees, judgments,  fines
and settlement  amounts actually and reasonably  incurred in a civil or criminal
action,  suit or  proceeding by reason of having been the  representative  of or
serving at the request of the corporation.

         Because the Company is a Swiss company  headquartered  in  Switzerland,
many of the directors  and officers of the Company are residents of  Switzerland
and not the U.S. As a result,  U.S. investors may find it difficult in a lawsuit
based on the civil liability provisions of the U.S. federal securities laws to:

         o   effect  service  within the U.S. upon the Company and the directors
             and officers of the Company located outside the U.S.,

         o   enforce  in U.S.  courts or  outside  the U.S.  judgments  obtained
             against those persons in U.S. courts,

         o   enforce in U.S. courts, judgments obtained against those persons in
             courts in jurisdictions outside the U.S., and

         o   enforce against those persons in  Switzerland,  whether in original
             actions or in actions  for the  enforcement  of  judgments  of U.S.
             courts,  civil  liabilities  based  solely  upon the  U.S.  federal
             securities laws.

         Neither the Company's  articles of association  nor Swiss statutory law
contain provisions regarding the indemnification of directors and officers.

         According to general  principles of Swiss  employment  law, an employer
may, under certain  circumstances,  be required to indemnify an employee against
losses and  expenses  incurred by him in the  execution  of his duties under the
employment  agreement,  unless the losses and expenses arise from the employee's
gross negligence or willful misconduct.

         The  Company  maintains  directors'  and  officers'  insurance  for its
directors and officers.

Item 7.  Exemption from Registration Claimed

         Not applicable.

Item 8.  Exhibits

         An Exhibit  Index,  containing a list of all  exhibits  filed with this
registration statement, is included on page 12. The Registrant hereby undertakes
that it will submit or has submitted  the Plan and any amendment  thereto to the
Internal  Revenue  Service  (the "IRS") in a timely  manner and has made or will
make all necessary changes required by the IRS in order to qualify the Plan.

Item 9.  Undertakings

         (a)  Rule 415 Offering.  The undersigned Registrant hereby undertakes:

         (1) To file, during any period in which offers or sales are being made,
    a post-effective amendment to this Registration Statement:

              (i) To include any Prospectus  required by section 10(a)(3) of the
         Securities Act, unless the information is contained in periodic reports
         filed by the Registrant  pursuant to section 13 or section 15(d) of the
         Exchange Act that are  incorporated  by  reference in the  Registration
         Statement;

              (ii) To  reflect  in the  Prospectus  any facts or events  arising
         after the  effective  date of the  Registration  Statement (or the most
         recent post-effective amendment thereof) which,  individually or in the
         aggregate,  represent a fundamental change in the information set forth
         in the Registration  Statement,  unless the information is contained in
         periodic  reports  filed by the  Registrant  pursuant  to section 13 or
         section 15(d) of the Exchange Act that are incorporated by reference in
         the Registration Statement;

              (iii) To include any material information with respect to the plan
         of distribution not previously disclosed in the Registration  Statement
         or  any  material  change  to  such  information  in  the  Registration
         Statement.

         (2) That,  for the  purpose  of  determining  any  liability  under the
    Securities Act, each such  post-effective  amendment shall be deemed to be a
    new registration  statement relating to the securities offered therein,  and
    the  offering  of such  securities  at that  time  shall be deemed to be the
    initial bona fide offering thereof.

         (3) To remove from registration by means of a post-effective  amendment
    any  of  the  securities   being  registered  which  remain  unsold  at  the
    termination of the offering.

         (b)  Subsequent  Exchange Act  Documents.  The  undersigned  Registrant
hereby  undertakes  that,  for purposes of determining  any liability  under the
Securities  Act,  each  filing of the  Registrant's  annual  report  pursuant to
section 13(a) or section 15(d) of the Exchange Act (and, where applicable,  each
filing of an employee  benefit plan's annual report pursuant to section 15(d) of
the  Exchange  Act)  that  is  incorporated  by  reference  in the  Registration
Statement  shall be deemed to be a new  registration  statement  relating to the
securities  offered  therein,  and the offering of such  securities at that time
shall be deemed to be the initial bona fide offering thereof.

         (c) Indemnification. Insofar as indemnification for liabilities arising
under the Securities Act may be permitted to directors, 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  Securities  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  director,  officer  or
controlling  person of the Registrant in the  successful  defense of any action,
suit or proceeding) is asserted by such director,  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
Securities Act and will be governed by the final adjudication of such issue.

<PAGE>
                                   SIGNATURES

         The Registrant.  Pursuant to the  requirements of the Securities Act of
1933, the Registrant certifies that it has reasonable grounds to believe that it
meets all of the  requirements  for filing on Form S-8 and has duly  caused this
registration statement to be signed on its behalf by the undersigned,  thereunto
duly  authorized,  in the City of Zurich,  Switzerland on the 29th day of March,
2001.

                                     UBS AG



                                     By:  /s/ Luqman Arnold
                                        -------------------------------
                                        Luqman Arnold
                                        Chief Financial Officer


                                     By:  /s/ Robert B. Mills
                                        -------------------------------
                                        Robert B. Mills
                                        Managing Director


         Pursuant  to the  requirements  of the  Securities  Act of  1933,  this
registration  statement  has  been  signed  by  the  following  persons  in  the
capacities and on the dates indicated.

Signatures                                 Title                      Date

         *                        President and Group Chief     March 29, 2001
--------------------------        Executive Officer (Principal
Marcel Ospel                      Executive Officer)


         *                        Chief Financial Officer       March 29, 2001
--------------------------        (Principal Financial Officer)
Luqman Arnold



         *                        Group Controller and Member   March 29, 2001
--------------------------        of Group Managing Board
Hugo Schaub                       (Principal Accounting
                                  Officer)

         *                        Chairman of the Board of      March 29, 2001
--------------------------        Directors
Alex Krauer


         *                        Vice Chairman of the Board    March 29, 2001
--------------------------        of Directors
Alberto Togni


         *                        Vice Chairman of the Board    March 29, 2001
--------------------------        of Directors
Markus Kundig


         *                        Director                      March 29, 2001
--------------------------
Peter Bockli


         *                        Director                      March 29, 2001
--------------------------
Eric Honegger


         *                        Director                      March 29, 2001
--------------------------
Rolf A. Meyer


         *                        Director                      March 29, 2001
--------------------------
Hans Peter Ming


                                  Director                      __________, 2001
--------------------------
Andreas Reinhart


*By:     /s/ Luqman Arnold
        ---------------------------
         Luqman Arnold
         Attorney-in-Fact
<PAGE>
         Pursuant to the  requirements  of Section 6(a) of the Securities Act of
1933,  as  amended,   the  Authorized   Representative   has  duly  caused  this
Registration  Statement  to be  signed,  solely  in his  capacity  as  the  duly
authorized  representative  of UBS AG in the United  States,  in the City of New
York, State of New York, on the 29th day of March 2001.

                                          /s/  Robert B. Mills
                                        -------------------------------
                                        Name:  Robert B. Mills
                                        Title:  Managing Director

<PAGE>

         The Plan.  Pursuant to the  requirements of the Securities Act of 1933,
as amended,  the trustees (or other persons who administer the employee  benefit
plan) have duly caused this registration statement to be signed on its behalf by
the undersigned,  thereunto duly authorized,  in the City of Stamford,  State of
Connecticut, on the 29th day of March, 2001.

                                     UBS AG SAVINGS AND INVESTMENT PLAN


                                     By:  /s/  Edward O'Dowd
                                        -------------------------------
                                        Edward O'Dowd
                                        Executive Director, Compensation
                                        and Benefits (Americas)
<PAGE>
                               Index to Exhibits



Exhibit No.                           Description of Exhibit

4.1               Articles of Association of UBS AG  (incorporated  by reference
                  to Exhibit 1.1 to the Company's Annual Report on Form 20-F for
                  the fiscal year ended December 31, 2000).

4.2               Organization  Regulations of UBS AG (incorporated by reference
                  to Exhibit 4.2 to the Company's Registration Statement on Form
                  S-8 (No. 333-50320)).

5                 See Item 8 undertaking in lieu of opinion.

23                Consent of Ernst & Young Ltd.

24                Power of Attorney.
[{"type": "S-8", "sequence": "1", "filename": "0001.txt", "description": "FORM S-8", "secsgml_size_bytes": 18745}]
{"company-data": {"conformed-name": "UBS AG", "cik": "0001114446", "assigned-sic": "6021", "irs-number": "000000000", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "S-8", "act": "33", "file-number": "333-57878", "film-number": "1584149"}, "business-address": {"street1": "BAHNHOFSTRASSE 45", "city": "ZURICH SWITZERLAND", "state": "V8", "zip": "00000"}, "mail-address": {"street1": "BAHNHOFSTRASSE 45", "street2": "ZURICH SWITZERLAND"}}
As filed with the Securities and Exchange Commission on March 29, 2001

                                                Registration No. 333-___________

================================================================================

                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

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

                                    FORM S-8

                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

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

                                     UBS AG
             (Exact name of registrant as specified in its charter)

         Switzerland                                             98-0186363
(State or other jurisdiction of                               (I.R.S. Employer
incorporation or organization)                               Identification No.)

                   Bahnhofstrasse 45, Zurich, Switzerland, and
                      Aeschenvorstadt 1, Basel, Switzerland
                    (Address of Principal Executive Offices)

                         UBS Savings and Investment Plan
                            (Full title of the Plan)

                           Robert C. Dinerstein, Esq.
                                     UBS AG
                                  299 Park Ave.
                            New York, New York 10171
                                 (212) 821-3000
            (Name, address and telephone number of agent for service)

================================================================================
CALCULATION OF REGISTRATION FEE
===================================================================================================================

Title of securities     Amount to be         Proposed maximum      Proposed maximum      Amount of
to be registered        registered           offering price per    aggregate offering    registration fee
                                             unit                  price
Ordinary Shares, par    1,000,000(1)                (2)            $134,900,000(2)          $33,725
value CHF 10

===================================================================================================================
(1)  Consists  of  Ordinary  Shares  to be  issued  under  the UBS  Savings  and
     Investment  Plan (the "Plan").  In addition,  pursuant to Rule 416(c) under
     the  Securities  Act of 1933,  this  Registration  Statement also covers an
     indeterminate  amount of  interests  to be offered or sold  pursuant to the
     Plan.  Such  indeterminate  number of additional  shares as may be issuable
     pursuant to a  recapitalization  of the  Ordinary  Shares under the Plan is
     hereby also registered.

(2)  Computed  pursuant to Rule 457(h) solely for the purpose of determining the
     registration  fee, based upon an assumed price of $134.90 per share,  which
     was the  average  of the high and low prices of UBS AG  Ordinary  Shares on
     March 23,  2001,  as reported on the New York Stock  Exchange  Consolidated
     Tape.
PART II

               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

Item 3.  Incorporation of Documents by Reference

         Incorporated  by  reference  in  this  Registration  Statement  are the
following  documents  heretofore  filed  by  UBS AG  (the  "Company")  with  the
Securities and Exchange Commission (the "Commission") pursuant to the Securities
Exchange Act of 1934, as amended (the "Exchange Act"):

         a.  The  Company's  Annual  Report  on Form  20-F  for the  year  ended
             December 31, 2000 filed pursuant to the Exchange Act;

         b.  All other reports filed by the Company  pursuant to sections  13(a)
             or 15(d) of the  Exchange  Act  since  the end of the  fiscal  year
             covered by the annual report referred to in (a) above; and

         c.  The description of the Company's  Ordinary Shares, par value CHF 10
             per share  (the  "Ordinary  Shares"),  contained  in the  Company's
             Annual  Report on Form 20-F  filed  with the  Commission  on May 9,
             2000,  pursuant to the Exchange Act (Registration  No.  001150226),
             and any  amendment or report filed for the purpose of updating such
             description.

         All documents  subsequently  filed by the Company  pursuant to sections
13(a),  13(c),  14 or 15(d)  of the  Exchange  Act,  prior  to the  filing  of a
post-effective  amendment that indicates that all securities offered hereby have
been sold or that deregisters all such securities then remaining  unsold,  shall
be deemed to be incorporated by reference in this Registration  Statement and to
be part hereof from the dates of filing of such documents.

         Any  statement  contained  in a document  incorporated  or deemed to be
incorporated  by reference  herein shall be deemed to be modified or  superseded
for  purposes  of this  registration  statement  to the extent  that a statement
contained  herein (or in any other  subsequently  filed  document  which also is
incorporated  or deemed to be  incorporated  by  reference  herein)  modified or
supersedes  such statement.  Any such statement so modified or superseded  shall
not be deemed, except as so modified or superseded, to constitute a part of this
registration statement.

Item 4.  Description of Securities

         Not applicable.

Item 5.  Interests of Named Experts and Counsel

         None.

Item 6.  Indemnification of Directors and Officers

         Under Swiss law,  directors and senior  officers acting in violation of
their  statutory  duties -  whether  dealing  with bona fide  third  parties  or
performing  any other acts on behalf of the  corporation  - may become liable to
the corporation, its shareholders and (in bankruptcy) its creditors for damages.
The directors'  liability is joint and several but only to the extent the damage
is  attributable  to each  director  based on willful or negligent  violation of
duty.  If the  board of  directors  lawfully  delegated  the  power to carry out
day-to-day  management to a different corporate body, e.g., the executive board,
the board of directors is not vicariously  liable for the acts of the members of
the executive board.  Instead the directors can be held liable for their failure
to properly  select,  instruct or supervise  the  executive  board  members.  If
directors  and officers  enter into a transaction  on behalf of the  corporation
with bona fide  third  parties  in  violation  of their  statutory  duties,  the
transaction  is  nevertheless  valid  as  long  as it is  not  excluded  by  the
corporation's business purpose.

         Under Swiss law, a  corporation  may indemnify a director or officer of
the  corporation  against  losses and  expenses  (unless  arising from his gross
negligence or willful misconduct),  including attorney's fees, judgments,  fines
and settlement  amounts actually and reasonably  incurred in a civil or criminal
action,  suit or  proceeding by reason of having been the  representative  of or
serving at the request of the corporation.

         Because the Company is a Swiss company  headquartered  in  Switzerland,
many of the directors  and officers of the Company are residents of  Switzerland
and not the U.S. As a result,  U.S. investors may find it difficult in a lawsuit
based on the civil liability provisions of the U.S. federal securities laws to:

         o   effect  service  within the U.S. upon the Company and the directors
             and officers of the Company located outside the U.S.,

         o   enforce  in U.S.  courts or  outside  the U.S.  judgments  obtained
             against those persons in U.S. courts,

         o   enforce in U.S. courts, judgments obtained against those persons in
             courts in jurisdictions outside the U.S., and

         o   enforce against those persons in  Switzerland,  whether in original
             actions or in actions  for the  enforcement  of  judgments  of U.S.
             courts,  civil  liabilities  based  solely  upon the  U.S.  federal
             securities laws.

         Neither the Company's  articles of association  nor Swiss statutory law
contain provisions regarding the indemnification of directors and officers.

         According to general  principles of Swiss  employment  law, an employer
may, under certain  circumstances,  be required to indemnify an employee against
losses and  expenses  incurred by him in the  execution  of his duties under the
employment  agreement,  unless the losses and expenses arise from the employee's
gross negligence or willful misconduct.

         The  Company  maintains  directors'  and  officers'  insurance  for its
directors and officers.

Item 7.  Exemption from Registration Claimed

         Not applicable.

Item 8.  Exhibits

         An Exhibit  Index,  containing a list of all  exhibits  filed with this
registration statement, is included on page 12. The Registrant hereby undertakes
that it will submit or has submitted  the Plan and any amendment  thereto to the
Internal  Revenue  Service  (the "IRS") in a timely  manner and has made or will
make all necessary changes required by the IRS in order to qualify the Plan.

Item 9.  Undertakings

         (a)  Rule 415 Offering.  The undersigned Registrant hereby undertakes:

         (1) To file, during any period in which offers or sales are being made,
    a post-effective amendment to this Registration Statement:

              (i) To include any Prospectus  required by section 10(a)(3) of the
         Securities Act, unless the information is contained in periodic reports
         filed by the Registrant  pursuant to section 13 or section 15(d) of the
         Exchange Act that are  incorporated  by  reference in the  Registration
         Statement;

              (ii) To  reflect  in the  Prospectus  any facts or events  arising
         after the  effective  date of the  Registration  Statement (or the most
         recent post-effective amendment thereof) which,  individually or in the
         aggregate,  represent a fundamental change in the information set forth
         in the Registration  Statement,  unless the information is contained in
         periodic  reports  filed by the  Registrant  pursuant  to section 13 or
         section 15(d) of the Exchange Act that are incorporated by reference in
         the Registration Statement;

              (iii) To include any material information with respect to the plan
         of distribution not previously disclosed in the Registration  Statement
         or  any  material  change  to  such  information  in  the  Registration
         Statement.

         (2) That,  for the  purpose  of  determining  any  liability  under the
    Securities Act, each such  post-effective  amendment shall be deemed to be a
    new registration  statement relating to the securities offered therein,  and
    the  offering  of such  securities  at that  time  shall be deemed to be the
    initial bona fide offering thereof.

         (3) To remove from registration by means of a post-effective  amendment
    any  of  the  securities   being  registered  which  remain  unsold  at  the
    termination of the offering.

         (b)  Subsequent  Exchange Act  Documents.  The  undersigned  Registrant
hereby  undertakes  that,  for purposes of determining  any liability  under the
Securities  Act,  each  filing of the  Registrant's  annual  report  pursuant to
section 13(a) or section 15(d) of the Exchange Act (and, where applicable,  each
filing of an employee  benefit plan's annual report pursuant to section 15(d) of
the  Exchange  Act)  that  is  incorporated  by  reference  in the  Registration
Statement  shall be deemed to be a new  registration  statement  relating to the
securities  offered  therein,  and the offering of such  securities at that time
shall be deemed to be the initial bona fide offering thereof.

         (c) Indemnification. Insofar as indemnification for liabilities arising
under the Securities Act may be permitted to directors, 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  Securities  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  director,  officer  or
controlling  person of the Registrant in the  successful  defense of any action,
suit or proceeding) is asserted by such director,  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
Securities Act and will be governed by the final adjudication of such issue.
SIGNATURES

         The Registrant.  Pursuant to the  requirements of the Securities Act of
1933, the Registrant certifies that it has reasonable grounds to believe that it
meets all of the  requirements  for filing on Form S-8 and has duly  caused this
registration statement to be signed on its behalf by the undersigned,  thereunto
duly  authorized,  in the City of Zurich,  Switzerland on the 29th day of March,
2001.

                                     UBS AG

                                     By:  /s/ Luqman Arnold
                                        -------------------------------
                                        Luqman Arnold
                                        Chief Financial Officer

                                     By:  /s/ Robert B. Mills
                                        -------------------------------
                                        Robert B. Mills
                                        Managing Director

         Pursuant  to the  requirements  of the  Securities  Act of  1933,  this
registration  statement  has  been  signed  by  the  following  persons  in  the
capacities and on the dates indicated.

Signatures                                 Title                      Date

         *                        President and Group Chief     March 29, 2001
--------------------------        Executive Officer (Principal
Marcel Ospel                      Executive Officer)

         *                        Chief Financial Officer       March 29, 2001
--------------------------        (Principal Financial Officer)
Luqman Arnold

         *                        Group Controller and Member   March 29, 2001
--------------------------        of Group Managing Board
Hugo Schaub                       (Principal Accounting
                                  Officer)

         *                        Chairman of the Board of      March 29, 2001
--------------------------        Directors
Alex Krauer

         *                        Vice Chairman of the Board    March 29, 2001
--------------------------        of Directors
Alberto Togni

         *                        Vice Chairman of the Board    March 29, 2001
--------------------------        of Directors
Markus Kundig

         *                        Director                      March 29, 2001
--------------------------
Peter Bockli

         *                        Director                      March 29, 2001
--------------------------
Eric Honegger

         *                        Director                      March 29, 2001
--------------------------
Rolf A. Meyer

         *                        Director                      March 29, 2001
--------------------------
Hans Peter Ming

                                  Director                      __________, 2001
--------------------------
Andreas Reinhart

*By:     /s/ Luqman Arnold
        ---------------------------
         Luqman Arnold
         Attorney-in-Fact
Pursuant to the  requirements  of Section 6(a) of the Securities Act of
1933,  as  amended,   the  Authorized   Representative   has  duly  caused  this
Registration  Statement  to be  signed,  solely  in his  capacity  as  the  duly
authorized  representative  of UBS AG in the United  States,  in the City of New
York, State of New York, on the 29th day of March 2001.

                                          /s/  Robert B. Mills
                                        -------------------------------
                                        Name:  Robert B. Mills
                                        Title:  Managing Director
The Plan.  Pursuant to the  requirements of the Securities Act of 1933,
as amended,  the trustees (or other persons who administer the employee  benefit
plan) have duly caused this registration statement to be signed on its behalf by
the undersigned,  thereunto duly authorized,  in the City of Stamford,  State of
Connecticut, on the 29th day of March, 2001.

                                     UBS AG SAVINGS AND INVESTMENT PLAN

                                     By:  /s/  Edward O'Dowd
                                        -------------------------------
                                        Edward O'Dowd
                                        Executive Director, Compensation
                                        and Benefits (Americas)
Index to Exhibits

Exhibit No.                           Description of Exhibit

4.1               Articles of Association of UBS AG  (incorporated  by reference
                  to Exhibit 1.1 to the Company's Annual Report on Form 20-F for
                  the fiscal year ended December 31, 2000).

4.2               Organization  Regulations of UBS AG (incorporated by reference
                  to Exhibit 4.2 to the Company's Registration Statement on Form
                  S-8 (No. 333-50320)).

5                 See Item 8 undertaking in lieu of opinion.

23                Consent of Ernst & Young Ltd.

24                Power of Attorney.