0001306830-20-000181 4 1 20200928 20200930 20200930 Casey Benita M 0001731983 4 34 001-32410 201213730 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_160150582109748.xml FORM 4 X0306 4 2020-09-28 0 0001306830 Celanese Corp CE 0001731983 Casey Benita M C/O CELANESE CORPORATION 222 W LAS COLINAS BLVD. SUITE 900N IRVING TX 75039 0 1 0 0 VP-Finance, Controller & CAO Common Stock 2020-09-28 4 A 0 2346 0 A 6780 D Time-based restricted stock units ("RSUs") granted pursuant to the Company's 2018 Global Incentive Plan. Each RSU represents the right to receive one share of Common Stock. The RSUs will vest, subject to continued employment, with respect to 25% of the RSUs on September 28, 2021, and with respect to 75% of the RSUs on September 28, 2022. /s/ Adam R. Santosuosso, Attorney-in-Fact for Benita M. Casey 2020-09-30