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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