Citigroup (C)

of Citigroup Inc. for the Annual Meeting, April 18, 2006

The undersigned hereby constitutes and appoints Charles Prince, Lewis B. Kaden and Michael S. Helfer, and each of them his or her true and lawful agents and proxies with full power of substitution in each, to represent the undersigned at the Annual Meeting of Stockholders of Citigroup Inc. (“Citigroup”) to be held at Carnegie Hall, 154 West 57^th Street, New York, New York, on Tuesday, April 18, 2006, at 9:00 a.m. local time and at any adjournments or postponements thereof, on all matters properly coming before the Annual Meeting, including but not limited to the matters set forth on the reverse side.

If shares of Citigroup Common Stock are issued to or held for the account of the undersigned under employee plans and voting rights attach to such shares (any of such plans, a “Voting Plan”), then the undersigned hereby directs the respective fiduciary of each applicable Voting Plan to vote all shares of Citigroup Common Stock in the undersigned’s name and/or account under such Plan in accordance with the instructions given herein, at the Annual Meeting and at any adjournments or postponements thereof, on all matters properly coming before the Annual Meeting, including but not limited to the matters set forth on the reverse side.

You are encouraged to specify your choices by marking the appropriate boxes, SEE REVERSE SIDE, but you need not mark any boxes if you wish to vote in accordance with the Board of Directors’ recommendations. Your proxy cannot be voted unless you sign, date and return this card or follow the instructions for telephone or Internet voting set forth on the reverse side.

This proxy, when properly executed, will be voted in the manner directed herein. If no direction is made, this proxy will be voted FOR Proposals 1-5 and AGAINST Proposals 6-12 and will be voted in the discretion of the proxies (or, in the case of a Voting Plan, will be voted in the discretion of the plan trustee or administrator) upon such other matters as may properly come before the Annual Meeting.

The signer(s) hereby acknowledge(s) receipt of the Notice of Annual Meeting of Stockholders and accompanying Proxy Statement. The signer(s) hereby revoke(s) all proxies heretofore given by the signer(s) to vote at said Annual Meeting and any adjournments or postponements thereof.

NOTE: Please sign exactly as name appears herein. Joint owners should each sign. When signing as attorney, executor, administrator, trustee or guardian, please give full title as such.

IF NO BOXES ARE MARKED, THIS PROXY WILL BE VOTED IN THE MANNER DESCRIBED ABOVE.

CONTINUED AND TO BE SIGNED ON REVERSE SIDE