UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

Date of Report (Date of earliest event reported) October 18, 2006

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Citigroup Inc.

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(Exact name of registrant as specified in its charter)

                            Delaware                                        1-9924                                   52-1568099

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                        (State or other                                (Commission                               (IRS Employer

                        jurisdiction of                                  File Number)                             Identification No.)

                        incorporation)

399 Park Avenue, New York, New York 10043

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(Address of principal executive offices)  (Zip Code)

(212) 559-1000

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(Registrant's telephone number, including area code)

                               Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation

                               of the registrant under any of the following provisions:

                               [ ] Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

                               [ ] Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

                               [ ] Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

                               [ ] Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Citigroup Inc.

Current Report on Form 8-K

                      Item 8.01 Other Events.

                                 Notices filed pursuant to Rule 135c under the Securities Act of 1933 relating to issuances by Citigroup Inc. in the second

                     quarter of 2006 made pursuant to Regulation S under the Securities Act of 1933.

                     Item 9.01 Financial Statements and Exhibits.

     (d)   Exhibits.

Exhibit Number

99.1   Rule 135c Notice relating to Citigroup’s EUR 1,000,000,000 floating rate notes due June 2013.

99.2   Rule 135c Notice relating to Citigroup’s GBP 400,000,000 5.25% notes due June 2011.

99.3   Rule 135c Notice relating to Citigroup’s HKD 1,100,000,000 floating rate notes due May 2011.

99.4   Rule 135c Notice relating to Citigroup’s HKD 620,000,000 floating rate notes due June 2011.

99.5   Rule 135c Notice relating to Citigroup’s SGD 215,000,000 4.05% subordinated notes due June 2016.

SIGNATURE

                            Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to

               be signed on its behalf by the undersigned hereunto duly authorized.

               Dated: October 18, 2006                                                                              CITIGROUP INC.

                                                                                                                           By:     /s/ Michael J. Tarpley

                                                                                                                           Name:Michael J. Tarpley

                                                                                                                           Title:Assistant Secretary

EXHIBIT INDEX

Exhibit Number

99.1   Rule 135c Notice relating to Citigroup’s EUR 1,000,000,000 floating rate notes due June 2013.

99.2   Rule 135c Notice relating to Citigroup’s GBP 400,000,000 5.25% notes due June 2011.

99.3   Rule 135c Notice relating to Citigroup’s HKD 1,100,000,000 floating rate notes due May 2011.

99.4   Rule 135c Notice relating to Citigroup’s HKD 620,000,000 floating rate notes due June 2011.

99.5   Rule 135c Notice relating to Citigroup’s SGD 215,000,000 4.05% subordinated notes due June 2016.