0001306830-24-000109 4 1 20240512 20240514 20240514 Hill Kathryn 0001533931 4 34 001-32410 24945785 7 WORLD TRADE CENTER 250 GREENWICH STREET NEW YORK NY 10007 Celanese Corp 0001306830 2820 08 Industrial Applications and Services 980420726 DE 1231 222 W. LAS COLINAS BLVD., SUITE 900N IRVING TX 75039-5421 972-443-4000 222 W. LAS COLINAS BLVD., SUITE 900N IRVING TX 75039-5421 Celanese CORP 20041102 Blackstone Crystal Holdings Capital Partners (Cayman) IV Ltd. 20041022 4 1 wk-form4_1715721528.xml FORM 4 X0508 4 2024-05-12 0 0001306830 Celanese Corp CE 0001533931 Hill Kathryn C/O CELANESE CORPORATION 222 W. LAS COLINAS BLVD., SUITE 900N IRVING TX 75039 1 0 0 0 0 Common Stock 2024-05-12 4 D 0 1777 D 9474 D Phantom Stock 2024-05-12 4 A 0 1777 0 A Common Stock 1777 3909.144 D Phantom Stock 2024-05-13 4 A 0 9.314 160.24 A Common Stock 9.314 3918.458 D Upon vesting of 1,777 Restricted Stock Units granted to the reporting person on May 12, 2023, the reporting person deferred the receipt of 1,777 shares of Common Stock and received instead 1,777 shares of phantom stock pursuant to the Company's 2008 Deferred Compensation Plan (the "Plan"). As a result, the reporting person is reporting the disposition of 1,777 shares of Common Stock in exchange for an equal number of shares of phantom stock. Each share of phantom stock represents the right to receive one share of Common Stock. As provided in the Plan, the reported phantom stock becomes payable in shares of Common Stock upon termination of the reporting person's service as a director of the Company subject to certain restrictions and limitations. The reported phantom stock represents dividend equivalents on compensation deferred under the Plan. The shares of phantom stock become payable in shares of Common Stock, as provided in the Plan, following the termination of the reporting person's service as a director of the Company. /s/ Adam R. Santosuosso, Attorney-in-Fact for Kathryn Hill 2024-05-14