Form 8-K: Director Appointment

Celanese Corporation announced on September 16, 2026, that Luis Fernandez-Moreno has been elected to its Board of Directors, increasing the board size to 11 members. Mr. Fernandez-Moreno, an independent director with extensive experience in the performance materials, specialty ingredients, and coatings industries, will serve until the 2027 Annual Meeting of Shareholders. His background includes leadership roles at Ashland, Inc. and Arch Chemicals, as well as 25 years at Rohm & Haas Company. He currently serves on the boards of Ingevity Corporation and Select Water Solutions. The company stated that Mr. Fernandez-Moreno will be compensated according to the standard practices for non-management directors and reimbursed for expenses. This appointment is expected to bring significant strategic and operational expertise to the board.