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GOSS · Additional Proxy Materials (DEFA14A) · Filed April 24, 2026

Gossamer Bio Inc — Additional Proxy Materials (DEFA14A)

Form
DEFA14A
Filed
April 24, 2026
Ticker
GOSS
Accession
0001728117-26-000028
Gossamer Bio Inc on Boardroom AlphaView on SEC EDGAR
Boardroom Alpha · Filing insights

Gossamer Bio urges stockholders to ratify Ernst & Young LLP as auditors for 2020.

About Gossamer Bio Inc
Market cap
$47M
1Y TSR
−78.3%
3Y TSR
−40.0%
Board grade
C
Sector
Healthcare
CEO
Faheem Hasnain
Last annual meeting: Jun 4, 2026 · View full Gossamer Bio Inc profile →
Document

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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Frequently asked questions

When did Gossamer Bio Inc file this DEFA14A?
Gossamer Bio Inc (GOSS) filed this Additional Proxy Materials (DEFA14A) with the SEC on April 24, 2026. The accession number assigned by EDGAR is 0001728117-26-000028.
What does a DEFA14A disclose?
DEFA14A is additional definitive proxy soliciting material filed in connection with a shareholder meeting — supplemental letters, slides, or amendments issued after the main proxy statement.
What is the key takeaway from this filing?
Gossamer Bio urges stockholders to ratify Ernst & Young LLP as auditors for 2020. This is Boardroom Alpha's one-line summary of the additional proxy materials; see the full filing text above for the formal disclosure.
Where can I find Gossamer Bio Inc's prior proxy statements on EDGAR?
The SEC EDGAR browser lists every DEFA14A Gossamer Bio Inc has filed under CIK 1728117, sortable by date. Use the "View on SEC EDGAR" link in the page header, or browse directly via https://www.sec.gov/cgi-bin/browse-edgar.
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