X0202 4 2005-12-20 0 0001306830 Celanese CORP CE 0001314705 Blackstone LR Associates (Cayman) IV Ltd. C/O THE BLACKSTONE GROUP, 345 PARK AVENUE NEW YORK NY 10154 0 0 1 0 0001314267 Blackstone Capital Partners (Cayman) Ltd 1 C/O THE BLACKSTONE GROUP 345 PARK AVENUE NEW YORK NY 10154 0 0 1 0 0001314268 Blackstone Capital Partners (Cayman) Ltd 2 C/O THE BLACKSTONE GROUP 345 PARK AVENUE NEW YORK NY 10154 0 0 1 0 0001314269 Blackstone Capital Partners (Cayman) Ltd 3 C/O THE BLACKSTONE GROUP 345 PARK AVENUE NEW YORK NY 10154 0 0 1 0 0001070843 PETERSON PETER G C/O THE BLACKSTONE GROUP 345 PARK AVE NEW YORK NY 10154 0 0 1 0 0001070844 SCHWARZMAN STEPHEN A C/O THE BLACKSTONE GROUP 345 PARK AVE NEW YORK NY 10154 0 0 1 0 Series A common stock, par value $0.0001 per share 2005-12-20 4 S 0 3301021 18.0 D 51167471 I See footnotes Series A common stock, par value $0.0001 per share 2005-12-20 4 S 0 228935 18.0 D 3548611 I See footnotes Series A common stock, par value $0.0001 per share 2005-12-20 4 S 0 1794749 18.0 D 27819502 I See footnotes Blackstone Capital Partners (Cayman) Ltd. 1 ("Cayman 1"), Blackstone Capital Partners (Cayman) Ltd. 2 ("Cayman 2") and Blackstone Capital Partners (Cayman) Ltd. 3 ("Cayman 3" and, collectively with Cayman 1 and Cayman 2, the "Cayman Entities"), respectively own 51,167,471, 3,548,611 and 27,819,502 shares of the Series A common stock reported as beneficially owned in the above table. Blackstone Capital Partners (Cayman) IV L.P. ("BCP IV") owns 100% of Cayman 1, Blackstone Family Investment Partnership (Cayman) IV-A L.P. ("BFIP") and Blackstone Capital Partners (Cayman) IV-A L.P. ("BCP IV-A") collectively own 100% of Cayman 2. Blackstone Chemical Coinvest Partners (Cayman) L.P. ("BCCP" and, collectively with BCP IV, BFIP and BCP IV-A, the "Blackstone Funds") owns 100% of Cayman 3. Each of the Blackstone Funds may be deemed to be the beneficial owner of the shares of Series A common stock held by the Cayman Entitites owned by such Blackstone Funds. Blackstone Management Associates (Cayman) IV L.P. ("BMA") is the general partner of each of the Blackstone Funds and, therefore, may be deemed to be the beneficial owner of the shares of Series A common stock held by the Cayman Entities. Blackstone LR Associates (Cayman) IV Ltd. ("BLRA") is the general partner of BMA and may, therefore, be deemed to be the beneficial owner of the shares of Series A common stock held by the Cayman Entities. Messrs. Peter G. Peterson and Stephen A. Schwarzman are directors and controlling persons of BLRA and, as such, may be deemed to share beneficial ownership of the shares of Series A common stock held by the Cayman Entities. Due to the electronic system's limitation of 10 Reporting Persons per joint filing, this statement is being filed in duplicate. Information with respect to each of the Reporting Persons is given solely by such Reporting Persons, and no Reporting Person has responsibility for the accuracy or completeness of information supplied by another Reporting Person. Pursuant to Rule 16a-1(a)(4) of the Exchange Act, each of the Reporting Persons, other than the Cayman Entities, herein states that this filing shall not be deemed an admission that he or it is the beneficial owner of any of the shares of Series A common stock covered by this Statement. Each of BLRA, BMA, Messrs. Peter G. Peterson and Stephen A. Schwarzman disclaims beneficial ownership of the Series A common stock, except to the extent of its or his pecuniary interest in such shares of Series A common stock. /s/ Robert L. Friedman (see exhibit 99.1) 2005-12-20