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): May 14, 2007 CELANESE CORPORATION -------------------- (Exact Name of Registrant as specified in its charter) DELAWARE 001-32410 98-0420726 ------------------------------- ---------------------- --------------------- (State or other jurisdiction (Commission File (IRS Employer of incorporation) Number) Identification No.) 1601 WEST LBJ FREEWAY, DALLAS, TEXAS 75234-6034 ----------------------------------------------- (Address of Principal Executive Offices) (Zip Code) Registrant's telephone number, including area code: (972) 443-4000 NOT APPLICABLE -------------- (Former name or former address, if changed since last report): 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 (see General Instruction A.2. below): [ ] 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)) ITEM 8.01 OTHER EVENTS On May 14, 2007, Blackstone Capital Partners (Cayman) Ltd. 1, Blackstone Capital Partners (Cayman) Ltd. 2, Blackstone Capital Partners (Cayman) Ltd. 3 and Blackstone Management Partners IV L.L.C. (collectively, the "selling stockholders") and Celanese Corporation (the "Company") entered into an underwriting agreement (the "Underwriting Agreement") with Morgan Stanley & Co. Incorporated (the "Underwriter") pursuant to which the selling stockholders agreed to sell to the Underwriter 22,106,597 shares of the Company's Series A common stock in a registered public secondary offering pursuant to the Company's universal shelf registration statement on Form S-3 filed on May 9, 2006 (File No. 333-133934). The Underwriting Agreement and the legal opinion relating to the offering are filed herewith as Exhibits 1.1 and 5.2, respectively. ITEM 9.01 FINANCIAL STATEMENTS AND EXHIBITS (c) Exhibits Exhibit Number Description -------------- ----------- 1.1 Underwriting Agreement, dated May 14, 2007 5.2 Opinion of Simpson Thacher & Bartlett LLP 23.1 Consent of Simpson Thacher & Bartlett LLP (included in Exhibit 5.2) SIGNATURES 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. CELANESE CORPORATION By: /s/ Kevin J. Rogan ------------------------------------ Name: Kevin J. Rogan Title: Assistant Secretary Date: May 16, 2007 EXHIBIT INDEX Exhibit Number Description -------------- ----------- 1.1 Underwriting Agreement, dated May 14, 2007 5.2 Opinion of Simpson Thacher & Bartlett LLP 23.1 Consent of Simpson Thacher & Bartlett LLP (included in Exhibit 5.2)