Celanese Corp — Director's Dealing 2011

May 18, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Celanese CORP (CE)
CIK: 0001306830
Period of Report: 2011-05-16

Reporting Person: ALDER JAMES (SVP, Operations & Technical)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-05-16	Series A Common Stock	M	51100	$16.00	Acquired	160758	Direct
2011-05-16	Series A Common Stock	S	51100	$52.04	Disposed	109658	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-05-16	Non-Qualified Stock Option (right to buy)	$16.00	M	51100	Disposed	2015-01-21	Series A Common Stock (51100)	Direct

Footnotes

F1: The reported price in this line is a weighted average sales price. These shares were sold in multiple transactions at prices ranging from $52.00 to $52.23. The reporting person will provide to the Company, any security holder of the Company, or the staff of the SEC, upon request, full information regarding the number of shares sold at each price within the range.

F2: Granted pursuant to the Company's 2004 Stock Incentive Plan. The options vested, with respect to 15% of the options on January 21, 2005, with respect to 30% of the options on each of December 31, 2005 and December 31, 2006, with respect to 15% of the options on December 31, 2007 and with respect to 10% of the options on December 31, 2008.