FORM 4
[ X ] 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
                                                                                  
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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 *

HAIN J TRAVIS 		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)

3. Date of Earliest Transaction (MM/DD/YYYY)

4/7/2005
(Street)

 
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
6. Individual or Joint/Group Filing (Check Applicable Line)

_ X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

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 V Amount (A) or (D) Price
Series A Common Stock   4/7/2005     C    7350435   A   (1) 7905169   I   see footnote   (2)

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 V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Series B Common Stock     (1) 4/7/2005     C        7350435    1/24/2005     (1) Series A Common Stock   7350435     (1) 0   I   see footnote   (2)

Explanation of Responses:
(1)  On April 7, 2005, all shares of Series B Common Stock were manditorily converted into shares of Series A Common Stock on a 1-for-1 basis pursuant to the certificate of incorporation of Celanese Corporation in a transaction exempt pursuant to Rule 16b-6(b).
(2)  BA Capital Investors Sidecar Fund, L.P. owns the securities reported as beneficially owned on this Form 4. As the director of BACM I Sidecar GP Limited, the general partner of BA Capital Management Sidecar, L.P., which is the general partner of BA Capital Investors Sidecar Fund, L.P., Mr. Hain controls BA Capital Investors Sidecar Fund, L.P. Mr. Hain disclaims beneficial ownership of the reported shares except to the extent of his pecuniary interest therein.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
HAIN J TRAVIS

 
X


Signatures
/s/ J. Travis Hain 4/7/2005
** Signature of Reporting Person Date


Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* 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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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EXHIBIT 99.1

Information Regarding Joint Filers

Designated Filer of Form 4: J. Travis Hain

Item 2. Date of Event Requiring Statement: April 7, 2005

Item 4. Issuer Name and Ticker Symbol: Celanese Corporation (CE)

Designated Filer:

Ownership Form

Nature of Indirect

Beneficial Ownership

J. Travis Hain

100 North Tryon Street

Bank of America Plaza

Charlotte, NC 28255

Indirect

Indirect 100% Owner of Reported Shares, as director of BACM I Sidecar GP Limited

Joint Filers:

BA Capital Investors Sidecar Fund, L.P.

100 North Tryon Street

Bank of America Plaza

Charlotte, NC 28255

 

 

Direct

 

BA Capital Management Sidecar, L.P.

100 North Tryon Street

Bank of America Plaza

Charlotte, NC 28255

Indirect

Indirect 100% Owner of Reported Shares, as general partner of BA Capital Investors Sidecar Fund, L.P.

BACM I Sidecar GP Limited

100 North Tryon Street

Bank of America Plaza

Charlotte, NC 28255

 

Indirect

Indirect 100% Owner of Reported Shares, as general partner of BA Capital Management Sidecar, L.P.

SIGNATURES

BA CAPITAL INVESTORS SIDECAR FUND, L.P. Dated: April 7, 2005

By: BA Capital Management Sidecar, L.P., its general partner

By: BACM I Sidecar GP Limited, its general partner

By: /s/ J. Travis Hain
Name: J. Travis Hain
Title: Director

BA CAPITAL MANAGEMENT SIDECAR, L.P. Dated: April 7, 2005

By: BACM I Sidecar GP Limited, its general partner

By: /s/ J. Travis Hain
Name: J. Travis Hain
Title: Director

BACM I SIDECAR GP LIMITED Dated: April 7, 2005

By: /s/ J. Travis Hain
Name: J. Travis Hain
Title: Director