EXHIBIT 99.22

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                                    GUARANTEE

                                     of the

                           COMMON SECURITIES GUARANTEE

                               TARGETS TRUST XXIV

                            Dated as of June 30, 2005

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            This GUARANTEE AGREEMENT (the "Guarantee Agreement") dated as of
June 30, 2005 is executed and delivered by Citigroup Inc., a Delaware
corporation (the "Guarantor"), for the benefit of the holders (the "Holders")
from time to time of the Common Securities (as defined herein) of TARGETS Trust
XXIV, a Delaware statutory trust (the "Issuer").

            WHEREAS, pursuant to an Amended and Restated Declaration of Trust
dated as of February 25, 2005 among the Trustees of the Issuer named therein
(the "Trustees"), Citigroup Global Markets Holdings Inc., a New York corporation
("CGMHI"), as sponsor of the Issuer, and the holders from time to time of
undivided beneficial interests in the assets of the Issuer, the Issuer issued on
that date 146,444 common securities, designated the Common Securities (the
"Common Securities");

            WHEREAS, pursuant to a Common Securities Guarantee Agreement (the
"CGMHI Guarantee"), dated as of February 25, 2005, executed and delivered by
CGMHI for the benefit of the Holders, CGMHI irrevocably and unconditionally
agreed, to the extent set forth in the CGMHI Guarantee, to pay to the Holders of
the Common Securities the Guarantee Payments (as defined therein) and to make
certain other payments on the terms and conditions set forth therein;

            WHEREAS, the Guarantor desires to fully and unconditionally
guarantee, as set forth herein, the Guarantee Payments;

            WHEREAS, the Guarantor is also executing and delivering a guarantee
agreement (the "Supplemental TARGETS Guarantee") with substantially identical
terms to this Guarantee for the benefit of the holders of the TARGETS(R) (as
defined therein), except that if the Guarantor is in default on any of its
obligations under the Supplemental TARGETS Guarantee, the rights of the Holders
of the Common Securities to receive Guarantee Payments under this Guarantee are
subordinated, to the extent and in the manner set forth herein, to the rights of
holders of TARGETS to receive Guarantee Payments under the Supplemental TARGETS
Guarantee.

            NOW, THEREFORE, the Guarantor does hereby fully and unconditionally
guarantee (the "Citigroup Guarantee") to the Holders the Guarantee Payments when
due, in accordance with the provisions of the CGMHI Guarantee, as provided
below:

                                    ARTICLE I
                                    Guarantee

            SECTION I.1. Notice of acceptance of the Citigroup Guarantee and of
default of performance by CGMHI is expressly waived, and payment under the
Citigroup Guarantee shall be subject to no condition other than the giving of a
written request for payment, 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 Citigroup



Guarantee shall rank in priority of payment with Citigroup's other obligations
to exactly the same extent that the Guarantee Payments rank with CGMHI's other
obligations, if any.

            SECTION I.3. The obligations of Citigroup under the Citigroup
Guarantee shall in no way be impaired by: (1) any extension, amendment,
modification or renewal of the Common Securities; (2) any waiver of any event of
default, extension of time or failure to enforce any of the Common 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
Citigroup 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 Guarantee Payments will be paid strictly in accordance with the
terms of the CGMHI Guarantee, regardless of the value, genuineness, validity,
regularity or enforceability of the Common 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 Common 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 Common Securities, or any
      other amendment or waiver of or consent to any departure from any other
      agreement relating to any Common 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 Common
      Securities;

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

            (vi)  the absence of notice or any delay in any action to enforce
      any Common Securities or to exercise any right or remedy against
      Citigroup, or CGMHI, whether

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      hereunder, under any Common Securities or any agreement or any indulgence,
      compromise or extension granted.

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

            SECTION I.6. Citigroup further agrees that, to the extent that CGMHI
or Citigroup makes a payment or payments to the Holders, 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 Citigroup 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 Common 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 Citigroup Guarantee shall be binding upon and
shall inure to the benefit of the Guarantor and its respective successors and
assigns.

                                   ARTICLE II
                            Miscellaneous Provisions

            SECTION II.1. This Guarantee Agreement is executed and shall be
construed as an amendment to the CGMHI Guarantee, and 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 Citigroup Guarantee. Except as expressly amended hereby, the
CGMHI Guarantee shall continue in full force and effect in accordance with the
provisions thereof and the CGMHI Guarantee is in all respects hereby ratified
and confirmed.

            SECTION II.2. All of the covenants, stipulations, premises and
agreements made in this Guarantee Agreement by Citigroup shall bind its
successors and assigns whether so expressed or not.

            SECTION II.3. This Guarantee Agreement 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.

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            This GUARANTEE AGREEMENT is executed as of the day and year first
above written.

                                         CITIGROUP INC., as Guarantor

                                         By: /s/ Charles E. Wainhouse
                                             -----------------------------------
                                             Name: Charles E. Wainhouse
                                             Title: Assistant Treasurer