0001306830-21-000141 4 1 20210517 20210519 20210519 Richardson Scott A 0001731988 4 34 001-32410 21940474 C/O CELANESE CORPORATION 222 W LAS COLINAS BLVD, SUITE 900N IRVING TX 75039 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_162145532128863.xml FORM 4 X0306 4 2021-05-17 0 0001306830 Celanese Corp CE 0001731988 Richardson Scott A C/O CELANESE CORPORATION 222 W LAS COLINAS BLVD., SUITE 900N IRVING TX 75039 0 1 0 0 EVP & CFO Common Stock 2021-05-17 4 S 0 6500 166.65 D 36138.703 D Common Stock 552.382 I by 401(k) Plan The sale reported in this line was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 1, 2021. /s/ Adam R. Santosuosso, Attorney-in-Fact for Scott A. Richardson 2021-05-19