AMENDMENT #11 TO SCHEDULE 13D
 

 
 

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934
(Amendment No. 11)*

Celanese Corporation
(Name of Issuer)
Series A Common Stock, par value $0.0001 per share
(Title of Class of Securities)
150870 10 3
(CUSIP Number)
Chinh E. Chu
The Blackstone Group
345 Park Avenue
New York, New York 10154
(212) 583-5000

Copy to:


William R. Dougherty, Esq.
Simpson Thacher & Bartlett LLP
425 Lexington Avenue
New York, New York 10017
(212) 455-2000
(Name, Address and Telephone Number of Person
Authorized to Receive Notices and Communications)
May 18, 2007
(Date of Event Which Require Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box. o

Note: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See §240.13d-7 for other parties to whom copies are to be sent.

* The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

 
 

 

                     
CUSIP No.
  
150870 10 3 

 

           
1   NAMES OF REPORTING PERSONS:
   
  S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY):
 
  Blackstone Capital Partners (Cayman) Ltd. 1
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
  (a)   o 
  (b)   þ 
     
3   SEC USE ONLY:
   
   
     
4   SOURCE OF FUNDS (SEE INSTRUCTIONS):
   
  OO
     
5   CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e):
   
  o
     
6   CITIZENSHIP OR PLACE OF ORGANIZATION:
   
  Cayman Islands
       
  7   SOLE VOTING POWER:
     
NUMBER OF   0
       
SHARES 8   SHARED VOTING POWER:
BENEFICIALLY  
OWNED BY   0
       
EACH 9   SOLE DISPOSITIVE POWER:
REPORTING    
PERSON   0
       
WITH 10   SHARED DISPOSITIVE POWER:
     
    0
     
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
   
  0
     
12   CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
   
  o
     
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):
   
  0%
     
14   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
   
  OO

 

 

                     
CUSIP No.
  
150870 10 3 

 

           
1   NAMES OF REPORTING PERSONS:
   
  S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY):
 
  Blackstone Capital Partners (Cayman) Ltd. 2
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
  (a)   o 
  (b)   þ 
     
3   SEC USE ONLY:
   
   
     
4   SOURCE OF FUNDS (SEE INSTRUCTIONS):
   
  OO
     
5   CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e):
   
  o
     
6   CITIZENSHIP OR PLACE OF ORGANIZATION:
   
  Cayman Islands
       
  7   SOLE VOTING POWER:
     
NUMBER OF   0
       
SHARES 8   SHARED VOTING POWER:
BENEFICIALLY    
OWNED BY   0
       
EACH 9   SOLE DISPOSITIVE POWER:
REPORTING    
PERSON   0
       
WITH 10   SHARED DISPOSITIVE POWER:
     
    0
     
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
   
  0
     
12   CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
   
  o
     
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):
   
  0%
     
14   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
   
  OO

 

 

                     
CUSIP No.
  
150870 10 3 

 

           
1   NAMES OF REPORTING PERSONS:
   
  S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY):
 
  Blackstone Capital Partners (Cayman) Ltd. 3
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
  (a)   o 
  (b)   þ 
     
3   SEC USE ONLY:
   
   
     
4   SOURCE OF FUNDS (SEE INSTRUCTIONS):
   
  OO
     
5   CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e):
   
  o
     
6   CITIZENSHIP OR PLACE OF ORGANIZATION:
   
  Cayman Islands
       
  7   SOLE VOTING POWER:
     
NUMBER OF   0
       
SHARES 8   SHARED VOTING POWER:
BENEFICIALLY  
OWNED BY   0
       
EACH 9   SOLE DISPOSITIVE POWER:
REPORTING    
PERSON   0
       
WITH 10   SHARED DISPOSITIVE POWER:
     
    0
     
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
   
  0
     
12   CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
   
  o
     
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):
   
  0%
     
14   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
   
  OO

 

 

                     
CUSIP No.
  
150870 10 3 

 

           
1   NAMES OF REPORTING PERSONS:
   
  S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY):
 
  Blackstone Capital Partners (Cayman) IV L.P.
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
  (a)   o 
  (b)   þ 
     
3   SEC USE ONLY:
   
   
     
4   SOURCE OF FUNDS (SEE INSTRUCTIONS):
   
  OO
     
5   CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e):
   
  o
     
6   CITIZENSHIP OR PLACE OF ORGANIZATION:
   
  Cayman Islands
       
  7   SOLE VOTING POWER:
     
NUMBER OF   0
       
SHARES 8   SHARED VOTING POWER:
BENEFICIALLY  
OWNED BY   0
       
EACH 9   SOLE DISPOSITIVE POWER:
REPORTING    
PERSON   0
       
WITH 10   SHARED DISPOSITIVE POWER:
     
    0
     
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
   
  0
     
12   CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
   
  o
     
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):
   
  0%
     
14   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
   
  PN

 

 

                     
CUSIP No.
  
150870 10 3 

 

           
1   NAMES OF REPORTING PERSONS:
   
  S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY):
 
  Blackstone Capital Partners (Cayman) IV-A L.P.
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
  (a)   o 
  (b)   þ 
     
3   SEC USE ONLY:
   
   
     
4   SOURCE OF FUNDS (SEE INSTRUCTIONS):
   
  OO
     
5   CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e):
   
  o
     
6   CITIZENSHIP OR PLACE OF ORGANIZATION:
   
  Cayman Islands
       
  7   SOLE VOTING POWER:
     
NUMBER OF   0
       
SHARES 8   SHARED VOTING POWER:
BENEFICIALLY  
OWNED BY   0
       
EACH 9   SOLE DISPOSITIVE POWER:
REPORTING    
PERSON   0
       
WITH 10   SHARED DISPOSITIVE POWER:
     
    0
     
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
   
  0
     
12   CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
   
  o
     
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):
   
  0%
     
14   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
   
  PN

 

 

                     
CUSIP No.
  
150870 10 3 

 

           
1   NAMES OF REPORTING PERSONS:
   
  S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY):
 
  Blackstone Family Investment Partnership (Cayman) IV-A L.P.
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
  (a)   o 
  (b)   þ 
     
3   SEC USE ONLY:
   
   
     
4   SOURCE OF FUNDS (SEE INSTRUCTIONS):
   
  OO
     
5   CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e):
   
  o
     
6   CITIZENSHIP OR PLACE OF ORGANIZATION:
   
  Cayman Islands
       
  7   SOLE VOTING POWER:
     
NUMBER OF   0
       
SHARES 8   SHARED VOTING POWER:
BENEFICIALLY  
OWNED BY   0
       
EACH 9   SOLE DISPOSITIVE POWER:
REPORTING    
PERSON   0
       
WITH 10   SHARED DISPOSITIVE POWER:
     
    0
     
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
   
  0
     
12   CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
   
  o
     
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):
   
  0%
     
14   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
   
  PN

 

 

                     
CUSIP No.
  
150870 10 3 

 

           
1   NAMES OF REPORTING PERSONS:
   
  S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY):
 
  Blackstone Chemical Coinvest Partners (Cayman) L.P.
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
  (a)   o 
  (b)   þ 
     
3   SEC USE ONLY:
   
   
     
4   SOURCE OF FUNDS (SEE INSTRUCTIONS):
   
  OO
     
5   CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e):
   
  o
     
6   CITIZENSHIP OR PLACE OF ORGANIZATION:
   
  Cayman Islands
       
  7   SOLE VOTING POWER:
     
NUMBER OF   0
       
SHARES 8   SHARED VOTING POWER:
BENEFICIALLY    
OWNED BY   0
       
EACH 9   SOLE DISPOSITIVE POWER:
REPORTING    
PERSON   0
       
WITH 10   SHARED DISPOSITIVE POWER:
     
    0
     
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
   
  0
     
12   CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
   
  o
     
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):
   
  0%
     
14   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
   
  PN

 

 

                     
CUSIP No.
  
150870 10 3 

 

           
1   NAMES OF REPORTING PERSONS:
   
  S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY):
 
  Blackstone Management Associates (Cayman) IV L.P.
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
  (a)   o 
  (b)   þ 
     
3   SEC USE ONLY:
   
   
     
4   SOURCE OF FUNDS (SEE INSTRUCTIONS):
   
  OO
     
5   CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e):
   
  o
     
6   CITIZENSHIP OR PLACE OF ORGANIZATION:
   
  Cayman Islands
       
  7   SOLE VOTING POWER:
     
NUMBER OF   0
       
SHARES 8   SHARED VOTING POWER:
BENEFICIALLY    
OWNED BY   0
       
EACH 9   SOLE DISPOSITIVE POWER:
REPORTING    
PERSON   0
       
WITH 10   SHARED DISPOSITIVE POWER:
     
    0
     
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
   
  0
     
12   CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
   
  o
     
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):
   
  0%
     
14   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
   
  PN

 

 

                     
CUSIP No.
  
150870 10 3 

 

           
1   NAMES OF REPORTING PERSONS:
   
  S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY):
 
  Blackstone LR Associates (Cayman) IV Ltd.
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
  (a)   o 
  (b)   þ 
     
3   SEC USE ONLY:
   
   
     
4   SOURCE OF FUNDS (SEE INSTRUCTIONS):
   
  OO
     
5   CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e):
   
  o
     
6   CITIZENSHIP OR PLACE OF ORGANIZATION:
   
  Cayman Islands
       
  7   SOLE VOTING POWER:
     
NUMBER OF   0
       
SHARES 8   SHARED VOTING POWER:
BENEFICIALLY    
OWNED BY   0
       
EACH 9   SOLE DISPOSITIVE POWER:
REPORTING    
PERSON   0
       
WITH 10   SHARED DISPOSITIVE POWER:
   
    0
     
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
   
  0
     
12   CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
   
  o
     
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):
   
  0%
     
14   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
   
  OO

 

 

                     
CUSIP No.
  
150870 10 3 

 

           
1   NAMES OF REPORTING PERSONS:
   
  S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY):
 
  Blackstone Management Partners IV L.L.C.
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
  (a)   o 
  (b)   þ 
     
3   SEC USE ONLY:
   
   
     
4   SOURCE OF FUNDS (SEE INSTRUCTIONS):
   
  WC
     
5   CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e):
   
  o
     
6   CITIZENSHIP OR PLACE OF ORGANIZATION:
   
  Delaware
       
  7   SOLE VOTING POWER:
     
NUMBER OF   0
       
SHARES 8   SHARED VOTING POWER:
BENEFICIALLY    
OWNED BY   0
       
EACH 9   SOLE DISPOSITIVE POWER:
REPORTING    
PERSON   0
       
WITH 10   SHARED DISPOSITIVE POWER:
     
    0
     
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
   
  0
     
12   CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
   
  o
     
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):
   
  0%
     
14   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
   
  OO

 

 

                     
CUSIP No.
  
150870 10 3 

 

           
1   NAMES OF REPORTING PERSONS:
   
  S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY):
 
  Peter G. Peterson
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
  (a)   o 
  (b)   þ 
     
3   SEC USE ONLY:
   
   
     
4   SOURCE OF FUNDS (SEE INSTRUCTIONS):
   
  OO
     
5   CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e):
   
  o
     
6   CITIZENSHIP OR PLACE OF ORGANIZATION:
   
  United States of America
       
  7   SOLE VOTING POWER:
     
NUMBER OF   0
       
SHARES 8   SHARED VOTING POWER:
BENEFICIALLY    
OWNED BY   0
       
EACH 9   SOLE DISPOSITIVE POWER:
REPORTING    
PERSON   0
       
WITH 10   SHARED DISPOSITIVE POWER:
     
    0
     
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
   
  0
     
12   CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
   
  o
     
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):
   
  0%
     
14   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
   
  IN

 

 

                     
CUSIP No.
  
150870 10 3 

 

           
1   NAMES OF REPORTING PERSONS:
   
  S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY):
 
  Stephen A. Schwarzman
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
  (a)   o 
  (b)   þ 
     
3   SEC USE ONLY:
   
   
     
4   SOURCE OF FUNDS (SEE INSTRUCTIONS):
   
  OO
     
5   CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e):
   
  o
     
6   CITIZENSHIP OR PLACE OF ORGANIZATION:
   
  United States of America
       
  7   SOLE VOTING POWER:
     
NUMBER OF   0
       
SHARES 8   SHARED VOTING POWER:
BENEFICIALLY    
OWNED BY   0
       
EACH 9   SOLE DISPOSITIVE POWER:
REPORTING    
PERSON   0
       
WITH 10   SHARED DISPOSITIVE POWER:
     
    0
     
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
   
  0
     
12   CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
   
  o
     
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):
   
  0%
     
14   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
   
  IN

 

 

     This Amendment No. 11 amends and supplements the statement on Schedule 13D, originally filed with the Securities and Exchange Commission on March 30, 2005 (as it may be amended from time to time, the “Schedule 13D”) with respect to the Series A Common Stock, par value $0.0001 per share (the “Series A Common Stock”), of Celanese Corporation, a Delaware corporation (the “Issuer”). Each item below amends and supplements the information disclosed under the corresponding item of the Schedule 13D. Unless otherwise indicated herein, terms used but not defined in this Amendment No. 11 shall have the same respective meanings herein as are ascribed to such terms in the Schedule 13D.
     ITEM 4. PURPOSE OF TRANSACTION.
     On May 18, 2007, pursuant to the consummation of a secondary offering of the Issuer’s Series A Common Stock, BCP 1, BCP 2, BCP 3 and BMP sold 13,647,620, 946,501 and 7,420,144 and 92,332 shares of Series A Common Stock, respectively, (or 22,106,597 shares in aggregate) at a price of $35.50 per share. Immediately following the sale of the 22,106,597 shares, the Reporting Persons ceased to beneficially own any shares of Series A Common Stock.
ITEM 5. INTEREST IN SECURITIES OF THE ISSUER
     (a) and (b). The information contained on the cover pages and in Item 4 of this Schedule 13D is incorporated herein by reference.
     (c) The information contained in Item 4 of this Schedule 13D is incorporated herein by reference.
     In the 60 days prior to and including May 18, 2007, there was one other transaction involving the subject securities by one or more of the Reporting Persons (other than the exercise by BMP of options to purchase shares of Series A Common Stock reported by BMP in Amendment No. 10 to the Schedule 13D). On April 18, 2007, pursuant to the consummation of the Stock Purchase Agreement between BCP 1, BCP 2, BCP 3, the Issuer and Celanese International Holdings Luxembourg S.à r.l., a wholly owned subsidiary of the Issuer (which agreement was previously disclosed in Amendment No. 9 to the Schedule 13D), BCP 1, BCP 2 and BCP 3 sold 203,968, 14,146 and 110,897 shares of Series A Common Stock, respectively (or 329,010 shares in aggregate), at the clearing price determined in the Stock Tender Offer of $30.50 per share.
     (e) Following the consummation of the secondary offering the Reporting Persons ceased to be the beneficial owners of any shares of Series A Common Stock as of May 18, 2007.

 

 

SIGNATURE
     After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.
Dated: May 22, 2007
             
    BLACKSTONE CAPITAL PARTNERS (CAYMAN) LTD. 1    
 
           
 
  By:   /s/ Robert L. Friedman    
 
           
 
      Name: Robert L. Friedman    
 
      Title: Director    
             
    BLACKSTONE CAPITAL PARTNERS (CAYMAN) LTD. 2    
 
           
 
  By:   /s/ Robert L. Friedman    
 
           
 
      Name: Robert L. Friedman    
 
      Title: Director    
             
    BLACKSTONE CAPITAL PARTNERS (CAYMAN) LTD. 3    
 
           
 
  By:   /s/ Robert L. Friedman    
 
           
 
      Name: Robert L. Friedman    
 
      Title: Director    
             
    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 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 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 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    
 
           
    BLACKSTONE MANAGEMENT ASSOCIATES (CAYMAN) IV L.P.    
 
           
    By: Blackstone LR Associates (Cayman) IV Ltd., its general partner    
 
           
 
  By:   /s/ Robert L. Friedman    
 
           
 
      Name: Robert L. Friedman    
 
      Title: Director    
 
           
    BLACKSTONE LR ASSOCIATES (CAYMAN) IV LTD.    
 
           
 
  By:   /s/ Robert L. Friedman    
 
           
 
      Name: Robert L. Friedman    
 
      Title: Director    
 
           
    BLACKSTONE MANAGEMENT PARTNERS IV L.L.C.    
 
           
 
  By:   /s/ Robert L. Friedman    
 
           
 
      Name: Robert L. Friedman    
 
      Title: Director    
 
           
    PETER G. PETERSON    
 
           
 
      /s/ Peter G. Peterson    
 
           
 
      Peter G. Peterson     
 
           
    STEPHEN A. SCHWARZMAN    
 
           
 
      /s/ Stephen A. Schwarzman    
 
           
 
      Stephen A. Schwarzman