Gossamer Bio amends bylaws to lower stockholder quorum to one-third

Gossamer Bio, Inc.

Board approved amended and restated bylaws effective September 3, 2026.
Quorum reduced from majority to one-third (1/3) of voting power of outstanding capital stock.
Change applies to all stockholder meetings unless law, charter, or bylaws require otherwise.
Full text of amended bylaws filed as Exhibit 3.1.

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