Gossamer Bio issues 2.5M shares for option to acquire Respira Therapeutics

Gossamer Bio, Inc.

Issued 2,500,000 shares to Prana Bio on Sept 24, 2025 as consideration for option to acquire Respira via merger.
Option exercisable until Dec 31, 2027 or earlier upon completion of certain Respira development activities.
May issue up to 1.5M additional shares upon exercise, plus up to ~6.7M shares on regulatory and sales milestones.
Shares issued in reliance on Section 4(a)(2) exemption from registration.

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