8-K current report · filed Sep 16, 2026

Gossamer Bio, Inc. (GOSS) 8-K Current Report: September 16, 2026

Item 5.02Item 1.01Item EX-99.1GOSS overview

Short answer

Gossamer Bio, Inc. (GOSS) filed an 8-K current report with the SEC on September 16, 2026 reporting Item 5.02 (Departure/Election of Directors or Officers), Item 1.01 (Entry into a Material Definitive Agreement), Item EX-99.1 (Exhibit EX-99.1). Board appointment of Mr. Ciongoli announced September 16, 2026.

Gossamer Bio, Inc. 8-K event analysis

AI summary of each reported item and its exhibits

Item 1.01 · Entry into a Material Definitive Agreement

  • Board appointment of Mr. Ciongoli announced September 16, 2026
  • Leadership addition may influence governance and strategic oversight
  • Exhibit 99.1 contains the appointment announcement details

Item 5.02 · Departure/Election of Directors or Officers

  • Gregory A. Ciongoli appointed Class III director through 2027 annual meeting and Audit Committee member
  • Nasdaq-independent director with investment background at Baupost Group and Adiumentum Capital Management
  • Annual compensation includes $40,000 board retainer and $7,500 Audit Committee retainer
  • Ciongoli’s 2026 PIPE participation creates potential ownership alignment and financing-related insider ties
  • PIPE-linked warrants potentially exercisable for approximately 200,869 common shares, subject to stockholder approval and FDA approval terms

Item EX-99.1 · Exhibit EX-99.1

  • Greg Ciongoli appointed director effective September 16, 2026, adding public and private investment expertise
  • Ciongoli joins the Audit Committee, strengthening financial oversight during seralutinib’s late-stage development
  • Board appointment signals emphasis on value creation as Gossamer advances seralutinib toward potential FDA approval
  • Ciongoli’s existing board roles include REGENXBIO, Zymeworks and Atara Biotherapeutics

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