0001306830-20-000179 4 1 20200914 20200916 20200916 WULFF JOHN K 0001257328 4 34 001-32410 201179184 C/O HERCULES INC 1313 NORTH MARKET STREET WILMINGTON DE 19894-0001 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_160028846410689.xml FORM 4 X0306 4 2020-09-14 0 0001306830 Celanese Corp CE 0001257328 WULFF JOHN K C/O CELANESE CORPORATION 222 W. LAS COLINAS BLVD., SUITE 900N IRVING TX 75039-5421 1 0 0 0 Common Stock 2020-09-14 4 S 0 750 107.79 D 20971 D The sales reported in this line were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 12, 2020. /s/ Adam R. Santosuosso, Attorney-in-Fact for John K. Wulff 2020-09-16