0001306830-21-000204 4 1 20211021 20211022 20211022 Brown William M 0001350633 4 34 001-32410 211340783 HARRIS CORPORATION 1025 W NASA BOULEVARD MELBOURNE FL 32919 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 wf-form4_163493420868953.xml FORM 4 X0306 4 2021-10-21 0 0001306830 Celanese Corp CE 0001350633 Brown William M C/O CELANESE CORPORATION 222 W LAS COLINAS BLVD, SUITE 900N IRVING TX 75039 1 0 0 0 Phantom Stock 2021-10-21 4 A 0 64.094 165.77 A Common Stock 64.094 9586.206 D Each share of phantom stock represents the right to receive the cash value of one share of Common Stock. The reported phantom stock represents a portion of the person's quarterly cash retainer for service as a director which has been deferred under the Company's 2008 Deferred Compensation Plan (the "Plan"). As provided in the Company's 2008 Deferred Compensation Plan, the reporting person may transfer a portion of the phantom stock account into an alternative investment account at any time, and on the earlier of the date previously elected by the reporting person to receive a payment or the termination of the reporting person's service as a director of the Company, the shares of phantom stock become payable in either cash or shares of Common Stock. /s/ Adam R. Santosuosso, Attorney-in-Fact for William M. Brown 2021-10-22