Celanese CORP (Form: 4, Received: 04/08/2005 14:34:31)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
Series A common stock, par value $0.0001 per share	4/7/2005	C ⁽¹⁾	57051899 ⁽¹⁾	A	$0	61357578	I	See footnotes ⁽¹⁾ ⁽²⁾ ⁽³⁾ ⁽⁴⁾ ⁽⁵⁾ ⁽⁶⁾ ⁽⁷⁾
Series A common stock, par value $0.0001 per share	4/7/2005	C ⁽¹⁾	3956713	A	$0 ⁽¹⁾	4255324	I	See footnotes ⁽¹⁾ ⁽²⁾ ⁽³⁾ ⁽⁴⁾ ⁽⁵⁾ ⁽⁶⁾ ⁽⁷⁾
Series A common stock, par value $0.0001 per share	4/7/2005	C ⁽¹⁾	31018837	A	$0 ⁽¹⁾	33359813	I	See footnotes ⁽¹⁾ ⁽²⁾ ⁽³⁾ ⁽⁴⁾ ⁽⁵⁾ ⁽⁶⁾ ⁽⁷⁾

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security
(Instr. 3)

2. Trans. Date

2A. Deemed Execution Date, if any

3. Trans. Code
(Instr. 8)

4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)

5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)

6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)

7. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

Amount

(A) or (D)

Price

Series A common stock, par value $0.0001 per share

4/7/2005

C ⁽¹⁾

57051899 ⁽¹⁾

61357578

See footnotes ⁽¹⁾ ⁽²⁾ ⁽³⁾ ⁽⁴⁾ ⁽⁵⁾ ⁽⁶⁾ ⁽⁷⁾

Series A common stock, par value $0.0001 per share

4/7/2005

C ⁽¹⁾

3956713

$0 ⁽¹⁾

4255324

See footnotes ⁽¹⁾ ⁽²⁾ ⁽³⁾ ⁽⁴⁾ ⁽⁵⁾ ⁽⁶⁾ ⁽⁷⁾

Series A common stock, par value $0.0001 per share

4/7/2005

C ⁽¹⁾

31018837

$0 ⁽¹⁾

33359813

See footnotes ⁽¹⁾ ⁽²⁾ ⁽³⁾ ⁽⁴⁾ ⁽⁵⁾ ⁽⁶⁾ ⁽⁷⁾

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)

1. Title of Derivate Security
(Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Trans. Date

3A. Deemed Execution Date, if any

4. Trans. Code
(Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)

6. Date Exercisable and Expiration Date

7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4)

8. Price of Derivative Security
(Instr. 5)

9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Trading Symbol:               Celanese Corporation (CE)

Designated Filer:             Blackstone Management Associates
                                (Cayman) IV L.P.

Other Joint Filers:           Blackstone Capital Partners (Cayman) IV L.P.,
                              Blackstone Family Investment Partnership (Cayman)
                              IV-A L.P., Blackstone Capital Partners (Cayman)
                              IV-A L.P.,  Blackstone Chemical Coinvest
                              Partners  (Cayman) L.P.

Addresses:                    The principal business address of each of the
                              Joint Filers above is c/o The Blackstone Group,
                              345 Park Avenue, New York, New York 10154

Signatures:                   Blackstone Capital Partners (Cayman) IV L.P.

                              By:  Blackstone Management Associates (Cayman)
                                   IV L.P., its general partner

                                   By:  Blackstone LR Associates (Cayman) IV
                                        Ltd., its general partner

                                   By:  /s/ Robert L. Friedman
                                        ------------------------------
                                        Name:  Robert L. Friedman
                                        Title: Director

                              Blackstone Family Investment Partnership
                                (Cayman) IV-A L.P.

                              By:  Blackstone Management Associates (Cayman)
                                   IV L.P., its general partner

                                   By:  Blackstone LR Associates (Cayman) IV
                                        Ltd., its general partner

                                   By:  /s/ Robert L. Friedman
                                        ------------------------------
                                        Name:  Robert L. Friedman
                                        Title: Director

                              Blackstone Capital Partners (Cayman) IV-A L.P.

                              By:  Blackstone Management Associates (Cayman)
                                   IV L.P., its general partner

                                   By:  Blackstone LR Associates (Cayman) IV
                                        Ltd., its general partner

                                   By:  /s/ Robert L. Friedman
                                        ------------------------------
                                        Name:  Robert L. Friedman
                                        Title: Director

                              Blackstone Chemical Coinvest Partners (Cayman)
                                L.P.

                              By:  Blackstone Management Associates (Cayman) IV
                                   L.P., its general partner

                                   By:  Blackstone LR Associates (Cayman) IV
                                        Ltd., its general partner

                                   By:  /s/ Robert L. Friedman
                                        ------------------------------
                                        Name:  Robert L. Friedman
                                        Title: Director

FORM 4 [ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES	OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response... 0.5
	Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

1. Name and Address of Reporting Person ^* BLACKSTONE MANAGEMENT ASSOCIATES CAYMAN IV LP	2. Issuer Name and Ticker or Trading Symbol Celanese CORP [ CE ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director __ X __ 10% Owner _____ Officer (give title below) _____ Other (specify below)
(Last) (First) (Middle) C/O THE BLACKSTONE GROUP, 345 PARK AVENUE	3. Date of Earliest Transaction (MM/DD/YYYY) 4/7/2005
(Street) NEW YORK, NY 10154 (City) (State) (Zip)	4. If Amendment, Date Original Filed (MM/DD/YYYY)	6. Individual or Joint/Group Filing (Check Applicable Line) ___ Form filed by One Reporting Person _ X _ Form filed by More than One Reporting Person

Explanation of Responses:
(1)	Represents shares of Series A common stock issued upon a mandatory conversion of all shared of Series B common stock pursuant to the certificate of incorporation of Celanese Corporation which conversion is exempt under Rule 16b-6(b) under the Securities Exchange Act of 1934, as amended (the "Exchange Act").
(2)	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 61,357,578, 4,255,324 and 33,359,813 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.
(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 Entities 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.
(4)	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.
(5)	Due to the electronic system's limitation of 10 Reporting Persons per joint filing, this statement is being filed in duplicate.
(6)	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.
(7)	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.

Reporting Owners
Reporting Owner Name / Address	Relationships
Reporting Owner Name / Address	Director	10% Owner	Officer	Other
BLACKSTONE MANAGEMENT ASSOCIATES CAYMAN IV LP C/O THE BLACKSTONE GROUP 345 PARK AVENUE NEW YORK, NY 10154		X
BLACKSTONE CAPITAL PARTNERS CAYMAN IV LP BLACKSTONE GROUP 345 PARK AVE NEW YORK, NY 10154		X
BLACKSTONE FAMILY INVESTMENT PARTNERSHIP CAYMAN IV-A LP BLACKSTONE GROUP 345 PARK AVE NEW YORK, NY 10154		X
BLACKSTONE CAPITAL PARTNERS CAYMAN IV- A LP BLACKSTONE GROUP 345 PARK AVE NEW YORK, NY 10154		X
Blackstone Chemical Coinvest Partners (Cayman) L.P. C/O THE BLACKSTONE GROUP 345 PARK AVENUE NEW YORK, NY 10154		X

Signatures
__________________________, Director		4/8/2005
^** Signature of Reporting Person		Date

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