This excerpt taken from the C DEF 14A filed Jun 18, 2009.
Q: What is the deadline for sending my Proxy Instructions or proxy?
A: If you are a holder of Public Preferred Depositary Shares or Trust Preferred Securities and you wish to participate in the Exchange Offers, you must have validly tendered your Public Preferred Depositary Shares or Trust Preferred Securities and given your Proxy Instructions to approve the Common Stock Amendments by following the procedures contained in the Letter of Transmittal prior to the expiration date of the Exchange Offers, which is set forth in the Prospectus and the Letter of Transmittal. This deadline may be extended by us in accordance with applicable law. We are not providing for guaranteed delivery procedures and therefore you must allow sufficient time to comply with the other procedures set forth in the Prospectus and the Letter of Transmittal prior to the expiration date of the Exchange Offers.
Other holders of our common stock as of the Record Date must return their proxy by the close of business on September 2, 2009 (the Proxy Deadline). Citigroup may, subject to applicable law, extend the Proxy Deadline in its sole discretion and we will announce any such extension by issuing a press release. If you hold your shares of common stock through a bank, broker, custodian or other nominee, due to the time required for your nominee to complete the required actions on your part, we urge you to contact your bank, broker, custodian or other nominee at least five business days prior to the Proxy Deadline.