0001959173-24-002360 144 1 20240315 20240315 Celanese Corp 0001306830 2820 08 Industrial Applications and Services 980420726 DE 1231 144 33 001-32410 24752842 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 Richardson Scott A 0001731988 144 C/O CELANESE CORPORATION 222 W LAS COLINAS BLVD, SUITE 900N IRVING TX 75039 144 1 primary_doc.xml UNITED STATES Form 144 Filer Information SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933 144: Issuer Information Name of Issuer Celanese Corp SEC File Number 001-32410 Address of Issuer 222 W. LAS COLINAS BLVD., SUITE 900N IRVING TEXAS 75039-5421 Phone 972-443-4000 Name of Person for Whose Account the Richardson Scott A Securities are To Be Sold See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice. Relationship to Issuer 1. Officer 144: Securities Information Title of the Number of Number of Class of Name and Shares or Aggregate Shares or Approximate Name the Record Securities To Address of the Other Market Other Units Date of Securities Be Sold Broker Units To Value Outstanding Sale Exchange Be Sold Fidelity Brokerage Services LLC #1 Common 900 Salem 2,000 $312,980.00 108,906,426 03/15/2024 NYSE Street Smithfield RHODE ISLAND 02917 144: Securities To Be Sold Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor: Nature of Name of Is Date Amount of Record Title of the Date you Acquisition Person from this Donor Securities Date of Payment Nature of Class Acquired Transaction Whom a Acquired Acquired Payment * Acquired Gift? Restricted #1 Common 02/15/2020 Stock Issuer ? — 2,000 02/15/2020 Compensation Vesting * If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid. 144: Securities Sold During The Past 3 Months Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold. Amount of Record Name and Address of Seller Title of Securities Sold Date of Sale Securities Gross Proceeds Sold Scott A. Richardson 222 W. Las Colinas Blvd. #1 Suite 900N Common 03/14/2024 2,000 $313,700.00 Irving TEXAS 75039-5421 144: Remarks and Signature Remarks Date of Notice 03/15/2024 Date of Plan Adoption or Giving of Instruction, If Relying on Rule 1. 12/12/2023 10b5-1 ATTENTION: The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date. /s/ Jared Cook, as a duly authorized Signature representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Scott A. Richardson ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)