UNITED STATES
SECURITIES AND EXCHANGE COMMISSIONWASHINGTON, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the Securities
Exchange Act of 1934

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Filed by a Party other than the Registrant ☐

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☐	Preliminary Proxy Statement
☐	Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))
☐	Definitive Proxy Statement
☒	Definitive Additional Materials
☐	Soliciting Material Pursuant to §240.14a-12

THIRD HARMONIC BIO, INC.
(Name of Registrant as Specified In Its Charter)

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

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Your Vote Counts! THIRD HARMONIC BIO, INC. 2024 Annual Meeting Vote by June 5, 2024 11:59 PM ET THIRD HARMONIC BIO, INC. 1700 MONTGOMERY STREET, SUITE 210 SAN FRANCISCO, CA 94111 V38500-P07464 You invested in THIRD HARMONIC BIO, INC. 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 materials for the stockholder meeting to be held on June 6, 2024. 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 May 23, 2024.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* June 6, 2024 7:00 A.M. Pacific Time Virtually at: www.virtualshareholdermeeting.com/THRD2024 *Please check the meeting materials for any special requirements for meeting attendance.

 

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. Board Recommends Voting Items 1. Election of Class II Directors For Nominees: 01) Michael Gladstone 02) H. Martin Seidel, Ph.D. 2. To ratify the appointment of Deloitte & Touche LLP as the independent registered public accounting firm of the company for its fiscal year ending December 31, 2024. For Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click “Delivery Settings”. V38501-P07464