Form DEFA14A Gossamer Bio, Inc.

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April 24, 2026 4:02 PM EDT

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 14A
Proxy Statement Pursuant to Section 14(a) of the
Securities Exchange Act of 1934
(Amendment No.     )
Filed by the Registrant  x    Filed by a Party other than the Registrant  ¨
Check the appropriate box:
¨ Preliminary Proxy Statement
¨    Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))
¨    Definitive Proxy Statement
x    Definitive Additional Materials
¨    Soliciting Material under §240.14a-12
Gossamer Bio, Inc.
(Name of Registrant as Specified In Its Charter)
 
(Name of Person(s) Filing Proxy Statement, if other than the Registrant)
Payment of Filing Fee (Check the appropriate box):
x
No fee required.
¨
Fee paid previously with preliminary materials.
¨
Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11 with preliminary
ote “FOR” Proposal 2. 2. Ratification of the appointment of Ernst & Young LLP as our independent registered public accountants for the year ending December 31, 2020. TO ATTEND the Annual Meeting of Gossamer Bio, Inc., please visit www.proxydocs.com/GOSS for virtual meeting registration details. The control number located in the shaded gray box will be required to register. INTERNET www.investorelections.com/GOSS TELEPHONE (866) 648-8133 *E-MAIL paper@investorelections.com ACCOUNT NO.     SHARE


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