Document:

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                                                                    Exhibit 4(w)

                   CITIGROUP GLOBAL MARKETS HOLDINGS INC.,

                                   As Company,

                                       AND

                           JPMORGAN CHASE BANK, N.A.,

                                   As Trustee

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

                             SUPPLEMENTAL INDENTURE

                          Dated as of October 30, 2001

                                       to

                                    INDENTURE

                            Dated as of May 26, 2000

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

                                       1
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                                                                    Exhibit 4(w)

                          FIRST SUPPLEMENTAL INDENTURE

      FIRST SUPPLEMENTAL INDENTURE, dated as of October 30, 2001 (this
"Supplemental Indenture"), between SALOMON SMITH BARNEY HOLDINGS INC., a New
York corporation (the "Company"), and THE CHASE MANHATTAN BANK, a New York
banking association, as trustee (the "Trustee"), under the Indenture dated as of
May 26, 2000 (as supplemented, the "Indenture").

      WHEREAS, pursuant to Section 801(5) of the Indenture, the Company and the
Trustee may enter into a supplemental indenture to change or eliminate any
provisions of the Indenture; provided that any such change or elimination shall
become effective only when there is no Outstanding Security of any series
created prior to the execution of such supplemental indenture which is entitled
to the benefit of such provision;

      WHEREAS, pursuant to Section 801(8) of the Indenture, the Company and the
Trustee may enter into a supplemental indenture to cure any ambiguity, to
correct or supplement any provision in the Indenture which may be inconsistent
with any other provision therein, or to make any other provisions with respect
to matters or questions arising under the Indenture; provided such action does
not adversely affect the interests of the Holders of Outstanding Securities of
any series created prior to the execution of such supplemental indenture in any
material respect; and

      WHEREAS, the Company and the Trustee desire to enter into this
Supplemental Indenture.

      NOW, THEREFORE, the parties hereto agree as follows:

      1. Defined Terms. Each capitalized term used but not defined herein shall
have the meaning ascribed thereto in the Indenture.

      2. Amendments to the Indenture.

      (a)   Section 402(8) of the Indenture is hereby amended to read in its
      entirety as follows:

            (8) a "RESET DATE" and the "INITIAL RESET DATE" shall occur on the
            dates specified in the Committee Certificate or in any indenture
            supplemental hereto.

      (b) With respect to the Outstanding Securities of TARGETS Trust X and
      TARGETS Trust XI, the first sentence of Section 402(8) is hereby amended
      to read in its entirety as follows:

            a "RESET DATE" shall occur on the 15th day of each calendar month
            beginning on the Initial Reset Date.

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                                                                    Exhibit 4(w)

      3. Acceptance by the Trustee. The Trustee accepts the trusts created by
this Supplemental Indenture upon the terms and conditions set forth in the
Indenture. The Trustee shall not be responsible or accountable in any manner
whatsoever for or in respect of, and makes no representation with respect to,
the validity or sufficiency of this Supplemental Indenture or the due execution
hereof by the Company and shall not be responsible in any manner whatsoever for
or in respect of the correctness of the recitals and statements contained
herein, all of which recitals and statements are made solely by the Company.

      4. Confirmation. Except as hereby expressly modified, the Indenture is in
all respects ratified and confirmed and all the terms, conditions and provisions
thereof shall remain in full force and effect.

      5. Governing Law. This Supplemental Indenture and the rights and
obligations of the parties hereto shall be governed by, and construed and
interpreted in accordance with, the law of the State of New York.

      6. Counterparts. This Supplemental Indenture may be executed in any number
of counterparts, each of which shall be deemed to be an original for all
purposes; but such counterparts shall together be deemed to constitute but one
and the same instrument.

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<PAGE>
                                                                    Exhibit 4(w)

      IN WITNESS WHEREOF, each of SALOMON SMITH BARNEY HOLDINGS INC. and THE
CHASE MANHATTAN BANK, as Trustee, has caused this Supplemental Indenture to be
signed and acknowledged by one of its officers thereunto duly authorized, and
its corporate seal to be affixed hereto and attested, all as of the day and year
first above written.

                                    SALOMON SMITH BARNEY HOLDINGS INC.

                                    By:    /s/ Mark I. Kleinman
                                           -----------------------------
                                           Name: Mark I. Kleinman
                                           Title: Executive Vice President and
                                           Treasurer

Attest:

By:    /s/ Douglas C. Turnbull
       -----------------------

Corporate Seal

                                    THE CHASE MANHATTAN BANK

                                    By:    /s/ Thomas Venusti
                                           ---------------------------
                                          Name: Thomas Venusti
                                          Title:      Trust Officer

Attest:

By:    /s/
       ---------------------------

Corporate Seal

                                       4<PAGE>
                                                                    Exhibit 4(x)

                   CITIGROUP GLOBAL MARKETS HOLDINGS INC.,

                                   As Issuer,

                                 CITIGROUP INC.,

                                  As Guarantor,

                                       AND

                           JPMORGAN CHASE BANK, N.A.,

                                   As Trustee

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

                             SUPPLEMENTAL INDENTURE

                            Dated as of June __, 2005

                                       to

                                    INDENTURE

                            Dated as of May 26, 2000

                ----------------------------------------------
<PAGE>
            THIS SECOND SUPPLEMENTAL INDENTURE dated as of June __, 2005 (the
"Supplemental Indenture") by and among Citigroup Global Markets Holdings Inc., a
corporation organized and existing under the laws of the State of New York
("CGMHI"), Citigroup Inc., a corporation organized and existing under the laws
of the State of Delaware, as Guarantor ("Citigroup"), and JPMorgan Chase Bank,
N.A., a national banking association, as trustee (the "Trustee");

            WHEREAS, CGMHI has heretofore executed and delivered to the Trustee
an indenture dated as of May 26, 2000 (as amended and supplemented to the date
hereof, the "Indenture") providing for the issuance by CGMHI from time to time
of certain securities representing interests in a Forward Contract relating to
the Common Stock of a Designated Issuer (each term as defined in the Indenture);

            WHEREAS, Citigroup desires to fully and unconditionally guarantee,
as set forth herein, the payment obligations of CGMHI with respect to CGMHI's
issued and outstanding securities under the Indenture (the "Debt Securities") as
set forth herein; and

            WHEREAS, the execution of the Supplemental Indenture is authorized
and permitted by Section 801 of the Indenture and all conditions precedent
provided for in the Indenture relating to the execution of the Supplemental
Indenture have been complied with;

            NOW, THEREFORE, THIS SUPPLEMENTAL INDENTURE WITNESSETH: That in
order to effectuate the guarantee described herein, Citigroup agrees with the
Trustee, for the equal and proportionate benefit of the respective Holders from
time to time of the Debt Securities (the "Holders"), as follows:

                                    ARTICLE I
                                    Guarantee

            Citigroup does hereby fully and unconditionally guarantee (the
"Guarantee") to the Holders all payments on the Debt Securities when due, in
accordance with the provisions of the Indenture, as provided below:

            SECTION I.1.  Notice of acceptance of the Guarantee and of
default of performance by CGMHI is expressly waived, and payment under the
Guarantee shall be subject to no condition other than the giving of a written
request for payment in accordance with the provisions of the Indenture,
stating the fact of default of performance, mailed to Citigroup at the
following address:  Citigroup Inc., Office of Corporate Treasury, 153 East
53rd Street, 6th Floor, New York, New York 10043, Attention: Treasurer.  This
Guarantee is a guarantee of payment and not of collection.

            SECTION I.2. The right of the Holders under any debt instrument of
CGMHI that is outstanding as of the date hereof to claim payment from Citigroup
under the Guarantee shall rank in priority of payment with Citigroup's other
obligations to exactly the same extent that the Debt Securities of CGMHI under
such debt instrument rank with CGMHI's other obligations, if any.
<PAGE>
            SECTION I.3. The obligations of Citigroup under the Guarantee shall
in no way be impaired by: (1) any extension, amendment, modification or renewal
of the Debt Securities; (2) any waiver of any event of default, extension of
time or failure to enforce any of the Debt Securities; or (3) any extension,
moratorium or other relief granted to CGMHI pursuant to any applicable law or
statute.

            SECTION I.4.  Citigroup shall be obligated to make payment under
the Guarantee, for the benefit of the Holders, at the same address as CGMHI
is obligated to make payment.

            SECTION I.5. (a) Subject to clause (b) below, Citigroup hereby
agrees that the Debt Securities will be paid strictly in accordance with the
terms of the Indenture, regardless of the value, genuineness, validity,
regularity or enforceability of the Debt Securities. Subject to clause (b)
below, the liability of Citigroup to the extent herein set forth shall be
absolute and unconditional, not subject to any reduction, limitation,
impairment, termination, defense, offset, counterclaim or recoupment whatsoever
(all of which are hereby expressly waived by Citigroup) whether by reason of any
claim of any character whatsoever, including, without limitation, any claim of
waiver, release, surrender, alteration or compromise, or by reason of any
liability at any time to Citigroup or otherwise, whether based upon any
obligations or any other agreement or otherwise, and howsoever arising, whether
out of action or inaction or otherwise and whether resulting from default,
willful misconduct, negligence or otherwise, and without limiting the foregoing,
irrespective of:

            (i) any lack of validity or enforceability of any agreement or
      instrument relating to the Debt Securities;

            (ii) any change in the time, manner or place of payment of, or in
      any other term in respect of, all or any of the Debt Securities, or any
      other amendment or waiver of or consent to any departure from any other
      agreement relating to any Debt Securities;

            (iii) any increase in, addition to, exchange or release of, or
      nonperfection of any lien on or security interest in, any collateral, or
      any release or amendment or waiver of or consent to any departure from or
      failure to enforce any other guarantee, for all or any of the
      indebtedness;

            (iv) any other circumstance which might otherwise constitute a
      defense available to, or a discharge of, CGMHI in respect of the Debt
      Securities;

            (v) the absence of any action on the part of the trustee to obtain
      payment of the Debt Securities from CGMHI;

            (vi) any insolvency, bankruptcy, reorganization or dissolution, or
      any similar proceeding of CGMHI, including, without limitation, rejection
      of the Debt Securities in such bankruptcy; or

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            (vii) the absence of notice or any delay in any action to enforce
      any Debt Securities or to exercise any right or remedy against Citigroup,
      or CGMHI, whether hereunder, under any Debt Securities or any agreement or
      any indulgence, compromise or extension granted.

            (b) Notwithstanding anything to the contrary in this Guarantee,
Citigroup does not waive any defense that would be available to CGMHI based on,
among other things, a breach, default or misrepresentation by the trustee, or
failure of any condition to CGMHI's obligations, under the Indenture or the
illegality of any provision of the Indenture.

            SECTION I.6. Citigroup further agrees that, to the extent that CGMHI
or Citigroup makes a payment or payments to the trustee, which payment or
payments or any part thereof are subsequently invalidated, declared to be
fraudulent or preferential, set aside and/or required to be repaid to CGMHI or
Citigroup or their respective estate, trustee, receiver or any other party under
any bankruptcy law, state or federal law, common law or equitable cause, then to
the extent of such payment or repayment, this Guarantee and the advances or part
thereof which have been paid, reduced or satisfied by such amount shall be
reinstated and continued in full force and effect as of the date such initial
payment, reduction or satisfaction occurred.

            SECTION I.7. Until the Debt Securities are paid in full, Citigroup
shall have no rights (direct or indirect) of subrogation, contribution,
reimbursement, indemnification, or other rights of payment or recovery from
CGMHI for any payments made by Citigroup hereunder.

            SECTION I.8. This Guarantee shall be binding upon and shall inure to
the benefit of the parties hereto and their respective successors and assigns,
including, without limitation, the Trustee.

                                   ARTICLE II

                            Miscellaneous Provisions

            SECTION II.1. This Supplemental Indenture is executed and shall be
construed as an indenture supplemental to the Indenture and, as provided in the
Indenture, this Supplemental Indenture forms a part thereof. Except as herein
expressly otherwise defined, the use of the terms and expressions herein is in
accordance with the definitions, uses and constructions contained in the
Indenture. Except as expressly amended hereby, the Indenture shall continue in
full force and effect in accordance with the provisions thereof and the
Indenture is in all respects hereby ratified and confirmed.

            SECTION II.2. The recitals herein and in the Debt Securities (except
in the Trustee's certificate of authentication) shall be taken as the statements
of CGMHI and Citigroup, and the Trustee assumes no responsibility for the
correctness thereof. The Trustee makes no representations as to the validity or
sufficiency of this Supplemental Indenture or of the Debt Securities. The
Trustee makes no undertakings or representations in respect of, and shall not be
responsible in any manner whatsoever for

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and in respect of, the validity or sufficiency of this Supplemental Indenture or
the proper authorization or the due execution hereof by CGMHI or Citigroup or
for or in respect of the recitals and statements contained herein, all of which
recitals and statements are made solely by CGMHI and Citigroup.

            SECTION II.3. All of the covenants, stipulations, premises and
agreements made in this Supplemental Indenture by CGMHI and Citigroup shall bind
their respective successors and assigns whether so expressed or not.

            SECTION II.4. This Supplemental Indenture shall be deemed to be a
contract made under the laws of the State of New York and for all purposes shall
be construed in accordance with the laws of said State.

            SECTION II.5. This Supplemental Indenture may be executed in any
number of counterparts, each of which when so executed shall be deemed to be an
original, but all such counterparts shall together constitute but one and the
same instrument.

                                       4
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            IN WITNESS WHEREOF, the parties hereto have caused this Supplemental
Indenture to be duly executed as of the day and year first above written.

                                          CITIGROUP GLOBAL MARKETS HOLDINGS
                                             INC., as Issuer

                                          By:
                                              --------------------------------
                                             Name: Geoffrey S. Richards
                                             Title:   Vice President

                                          CITIGROUP INC., as Guarantor

                                          By:
                                              --------------------------------
                                             Name: Charles Wainhouse
                                             Title:   Assistant Treasurer

                                          JPMORGAN CHASE BANK, N.A., as
                                             Trustee

                                          By:
                                              --------------------------------
                                             Name: Thomas Venusti
                                             Title:   Assistant Vice President

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