Mark Oberle
Tel. +1-972-443-4464
Fax +1-972-443-8519
mark.oberle@celanese.com

Transfer Agent/Stockholder Services
General inquiries about individual stock accounts may be directed to Celanese's stock transfer agent:

Computershare Trust Company, N.A.
P. O. Box 43010
Providence, RI 02940-3010
1-781-575-2400
www.computershare.com/equiserve