Gossamer Bio Amends Charter for Series A-1 Convertible Preferred Stock

What Happened

• On August 24, 2026, Gossamer Bio, Inc. filed with the Delaware Secretary of State a Certificate of Designation establishing the preferences, rights and limitations of its newly created Series A-1 Convertible Preferred Stock. The filing was made in connection with the closing of a previously announced private placement. The Company filed the related 8-K on August 26, 2026 and incorporated by reference the earlier 8-K dated August 21, 2026; the Certificate of Designation is included as Exhibit 3.1.

Key Details

• Date of filing with Delaware: August 24, 2026.
• Document filed: Certificate of Designation of Preferences, Rights and Limitations of Series A-1 Convertible Preferred Stock (Exhibit 3.1).
• Filing circumstance: In connection with the closing of a previously announced private placement (no dollar amounts disclosed in this 8-K).
• 8-K executed and signed by Christian Waage, EVP and General Counsel, dated August 26, 2026.

Why It Matters

• The Certificate of Designation defines the economic and voting terms for the new Series A-1 convertible preferred shares, which changes the company’s capital structure and could affect common shareholders through potential dilution or conversion mechanics.
• Investors should review the Certificate of Designation (Exhibit 3.1) and the related private placement disclosures to understand conversion terms, liquidation preferences, voting rights and other protections that govern these shares before making investment decisions.