0001306830-23-000171 4 1 20231113 20231115 20231115 Hill Kathryn 0001533931 4 34 001-32410 231410737 7 WORLD TRADE CENTER 250 GREENWICH STREET NEW YORK NY 10007 Celanese Corp 0001306830 2820 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_1700082872.xml FORM 4 X0508 4 2023-11-13 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 Phantom Stock 2023-11-13 4 A 0 12.532 117.85 A Common Stock 12.532 2122.345 D Each share of phantom stock represents the right to receive one share of Common Stock. The reported phantom stock represents dividend equivalents on compensation deferred under the Company's 2008 Deferred Compensation Plan (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 2023-11-15