Ownership Submission
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

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
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 (Month/Day/Year)
05/15/2006
(Street)

NEW YORK, NY 10154
4. If Amendment, Date Original Filed(Month/Day/Year)
6. Individual or Joint/Group Filing(Check Applicable Line)
___ Form filed by One Reporting Person
_X_ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction 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 V Amount (A) or (D) Price
Series A common stock, par value $0.0001 per share 05/15/2006   S   20,093,168 D $ 21.05 31,074,304 I See footnotes (1) (2) (3) (4) (5) (6)
Series A common stock, par value $0.0001 per share 05/15/2006   S   1,393,519 D $ 21.05 2,155,092 I See footnotes (1) (2) (3) (4) (5) (6)
Series A common stock, par value $0.0001 per share 05/15/2006   S   10,924,556 D $ 21.05 16,894,946 I See footnotes (1) (2) (3) (4) (5) (6)

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction 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
(Month/Day/Year)
7. Title and Amount of Underlying Securities
(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 V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address Relationships
 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

 /s/ Robert L. Friedman (see exhibit 99.1)   05/17/2006
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) 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 Entitites"), respectively own 31,074,304, 2,155,092 and 16,894,946 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.
(2) 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.
(3) 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.
(4) Due to the electronic system's limitation of 10 Reporting Persons per joint filing, this statement is being filed in duplicate.
(5) 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.
(6) 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.

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