HXL Hexcel Corporation

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

(Rule 14a-101)

SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

(Amendment No.     )

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Filed by a Party other than the Registrant  ☐

Check the appropriate box:

HEXCEL CORPORATION

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

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Your Vote Counts! HEXCEL CORPORATION 2023 Annual Meeting Vote by May 3, 2023, 11:59 PM EDT For shares held in Hexcel’s 401(k) plan or employee stock purchase plan, vote by May 1, 2023, 10:30 AM EDT HEXCEL CORPORATION ATTN: KURT GODDARD 2 STAMFORD PLAZA 281 TRESSER BLVD., 16TH FLOOR STAMFORD, CT 06901-3261 V05204-P87564-Z84428 You invested in HEXCEL CORPORATION and it’s time to vote! You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy material for the stockholder meeting to be held on May 4, 2023. Get informed before you vote View the Notice and Proxy Statement and Annual Report online OR you can receive a free paper or email copy of the material(s) by requesting prior to April 20, 2023. If you would like to request a copy of the material(s) for this and/or future stockholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to sendmaterial@proxyvote.com. If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you will not otherwise receive a paper or email copy. For complete information and to vote, visit www.ProxyVote.com Control # Smartphone users Point your camera here and vote without entering a control number Vote Virtually at the Meeting* May 4, 2023 10:30 AM EDT Virtually at: www.virtualshareholdermeeting.com/HXL2023 *Please check the meeting materials for any special requirements for meeting attendance. V1.1

Vote at www.ProxyVote.com THIS IS NOT A VOTABLE BALLOT This is an overview of the proposals being presented at the upcoming stockholder meeting. Please follow the instructions on the reverse side to vote these important matters. Voting Items 1. Election of Directors Nominees: 1a. Nick L. Stanage 1b. Jeffrey C. Campbell 1c. Cynthia M. Egnotovich 1d. Thomas A. Gendron 1e. Dr. Jeffrey A. Graves 1f. Guy C. Hachey 1g. Dr. Marilyn L. Minus 1h. Catherine A. Suever 2. Advisory non-binding vote to approve 2022 executive compensation. 3. Advisory non-binding vote to approve the frequency of the stockholder vote to approve executive compensation. 4. Ratification of the appointment of Ernst & Young LLP as the independent registered public accounting firm for 2023. NOTE: To transact such other business as may properly come before the Annual Meeting and any adjournments or postponements. Board Recommends For For For For For For For For For Year For Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click “Sign up for E-delivery”. V05205-P87564-Z84428