8-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): April 20, 2026 (April 16, 2026)

CELANESE CORPORATION

(Exact name of registrant as specified in its charter)

222 West Las Colinas Blvd. Suite 900N, Irving, TX 75039

(Address of Principal Executive Offices) (Zip Code)

Registrant's telephone number, including area code: (972) 443-4000

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

☐   Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐   Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐   Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐   Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 or Rule 12b-2 of the Securities Exchange Act of 1934.

Emerging growth company  ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ☐

Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

(d) On April 16, 2026, the Board of Directors (the "Board") of Celanese Corporation (the "Company") increased the size of the Board from nine to 10 members and elected Anne P. Noonan as a director of the Company, in each case effective April 20, 2026.

Ms. Noonan has been elected to serve on the Board until the Company's 2027 Annual Meeting of Shareholders, at which time she will be a nominee for election by the Company's shareholders. At this time, Ms. Noonan has not yet been appointed to any committee of the Board.

The Board has determined that Ms. Noonan (a) is an independent director within the meaning of the Securities Exchange Act of 1934, as amended, rules and regulations promulgated by the U.S. Securities and Exchange Commission (the "SEC") thereunder, and the listing standards of the New York Stock Exchange (the "NYSE") and (b) is not related to any officer or director of the Company nor is she a party to any transactions or relationships with the Company and its subsidiaries that require disclosure under Item 404(a) of Regulation S-K.

Ms. Noonan will be compensated in accordance with the Company's compensation practices for non-management directors. Ms. Noonan will also be reimbursed for expenses incurred on behalf of the Company, in accordance with Company policy.

There are no arrangements or understandings between Ms. Noonan and any other person pursuant to which she was elected as director.

On April 20, 2026, the Company issued a press release announcing the election of Ms. Noonan, a copy of which is attached hereto as Exhibit 99.1 and is incorporated by reference herein.

Item 9.01 Financial Statements and Exhibits

(d) The following exhibits are being furnished herewith:

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

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Document

Exhibit 99.1

Anne P. Noonan Elected to

Celanese Board of Directors

DALLAS (April 20, 2026) - Celanese Corporation (NYSE: CE), a global chemical and specialty materials company, today announced that Anne P. Noonan has been elected to the Company’s Board of Directors. Ms. Noonan, 62, brings over 30 years of leadership and industry experience, most recently serving as president and chief executive officer and a director of Summit Materials, Inc., a leading vertically integrated construction materials company that supplies aggregates, cement, ready-mix concrete and asphalt paving mix, from September 2020 to February 2025. At Summit, she oversaw the company’s strategic transformation focusing on operational discipline and growth across regions and product lines. She will join the Celanese Board effective April 20, 2026, bringing the total number of Board members to 10 (nine of whom are independent).

Before leading Summit Materials, Ms. Noonan served as president and chief executive officer of OMNOVA Solutions Inc., a global provider of emulsion polymers, specialty chemicals, and engineered surfaces for a variety of commercial, industrial, and residential end uses, from 2016 to 2020. During her tenure, she transformed the company into a high-performing specialty solutions provider. She previously served as OMNOVA’s president, performance chemicals, from 2014 until December 2016. Prior to OMNOVA, Ms. Noonan spent 27 years at Chemtura Corporation, a global manufacturer of specialty chemicals and held leadership roles across a wide range of disciplines, from strategic marketing to product development and innovation, to mergers and acquisitions and general management. Ms. Noonan serves on the board of CF Industries Holdings, Inc., a global leader in nitrogen fertilizer manufacturing and distribution, and on the board of Qnity Electronics, Inc., a technology solutions provider to the semiconductor and electronics industries.

Ms. Noonan holds a Bachelor of Science Honors degree in chemistry and a Master of Science in organometallic chemistry from University College Dublin, Ireland.

"On behalf of the Board, we are pleased to have Anne join us," stated Ed Galante, Chair of the Board at Celanese Corporation. "Her extensive background in leading chemical and manufacturing businesses demonstrates a track record of strategic vision, operational expertise, and value generation, along with exceptional industry insight. We look forward to benefiting from her experience and contributions as we advance the Company’s strategy to drive improved growth, profitability, and value for our shareholders."

Ms. Noonan will stand for re-election at the 2027 Annual Meeting of Shareholders.

About Celanese

Celanese is a global leader in chemistry, producing specialty material solutions used across most major industries and consumer applications. Our businesses use our chemistry, technology and commercial expertise to create value for our customers, employees and shareholders. We support sustainability by

responsibly managing the materials we create and growing our portfolio of sustainable products to meet customer and societal demand. We strive to make a positive impact in our communities and to foster inclusivity across our teams. Celanese Corporation is a Fortune 500 company that employs more than 11,000 employees worldwide with 2025 net sales of $9.5 billion.

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