Gossamer Bio, Inc.

For the period ended Sep 30, 2025. Filed Nov 5, 2025.

About this filing

A company's report for each of its first three quarters. The financial statements are not audited. It shows how the business has moved since the last annual report, and what management says changed.

Sep 30, 2025 · Filed Nov 5, 2025

GOSS$10.65+9.0%Stored close · as of Nov 9, 2026

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Contents

Exhibit Index

ExhibitNumber · Exhibit Description · Incorporated by Reference · Filed Herewith
Form · Date · Number
3.1	Amended and Restated Certificate of Incorporation, as amended.	10-Q	8/8/2023	3.1
3.2	Amended and Restated Bylaws.	10-Q	5/12/2020	3.2
4.1	Form of Common Stock Certificate.	S-1/A	1/23/2019	4.1
4.2	Amended and Restated Investors’ Rights Agreement, dated July 20, 2018, by and among the Registrant and certain of its stockholders.	S-1	12/21/2018	4.2
4.3	Indenture, dated as of May 21, 2020, by and between the Company and Wilmington Trust, National Association.	8-K	5/21/2020	4.1
4.4	First Supplemental Indenture, dated May 21, 2020, by and between the Company and Wilmington Trust, National Association.	8-K	5/21/2020	4.2
4.5	Form of Global Note representing 5.00% Convertible Senior Notes due 2027 (included as part of Exhibit 4.4).	8-K	5/21/2020	4.3
4.6	Form of Warrant	8-K	7/20/2023	4.1
10.1#	Gossamer Bio, Inc. Performance Stock Unit Agreement under the 2019 Equity Incentive Plan				X
31.1	Certification of Chief Executive Officer of Gossamer Bio, Inc., as required by Rule 13a-14(a) or Rule 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.				X
31.2	Certification of Chief Financial Officer of Gossamer Bio, Inc., as required by Rule 13a-14(a) or Rule 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.				X
32.1*	Certification of Chief Executive Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.				X
32.2*	Certification of Chief Financial Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.				X
101.INS	XBRL Report Instance Document				X
101.SCH	XBRL Taxonomy Extension Schema Document				X
101.CAL	XBRL Taxonomy Calculation Linkbase Document				X
101.LAB	XBRL Taxonomy Label Linkbase Document				X
101.PRE	XBRL Presentation Linkbase Document				X
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document				X
104	Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101)				X

*	This certification is deemed not filed for purpose of section 18 of the Exchange Act or otherwise subject to the liability of that section, nor shall it be deemed incorporated by reference into any filing under the Securities Act or the Exchange Act.
#	Indicates management contract or compensatory plan.

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The text of this filing, as the company filed it with the SEC, without its images or exhibits. This is not investment advice.