8-K current report · filed Jul 27, 2026

Gossamer Bio, Inc. (GOSS) 8-K Current Report: July 27, 2026

Item 1.01Item 2.02Item 7.01Item 8.01GOSS overview

Short answer

Gossamer Bio, Inc. (GOSS) filed an 8-K current report with the SEC on July 27, 2026 reporting Item 1.01 (Entry into a Material Definitive Agreement), Item 2.02 (Results of Operations and Financial Condition), Item 7.01 (Regulation FD Disclosure), Item 8.01 (Other Events). Gossamer regains worldwide seralutinib rights and control across PAH, PH-ILD, and potential future indications.

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

  • Gossamer regains worldwide seralutinib rights and control across PAH, PH-ILD, and potential future indications
  • Chiesi to pay Gossamer $5 million within 10 days for outstanding development costs
  • Gossamer assumes success-based milestone payments and capped royalties on net sales of previously licensed products
  • Chiesi transfers related regulatory filings and intellectual property, with licenses revocable after uncured payment breaches
  • Agreement terminates the 2024 collaboration, preserves indemnities, and releases most legacy claims

Item 2.02 · Results of Operations and Financial Condition

  • Preliminary liquidity of approximately $57.0 million at June 30, 2026
  • Cash balance includes cash, cash equivalents, and marketable securities
  • Unaudited estimate remains subject to quarter-end closing adjustments
  • Limited liquidity visibility pending finalized June 30, 2026 financial statements

Item 7.01 · Regulation FD Disclosure

  • Gossamer Bio announced rights reacquisition and related license termination, signaling a material shift in its partnering strategy
  • Press release includes FDA regulatory and business updates relevant to development timelines and commercialization prospects
  • Full details are in Exhibit 99.1, covering the July 27, 2026 announcement

Item 8.01 · Other Events

  • Seralutinib NDA submission planned for September 2026 following FDA Type B meeting
  • FDA classified PROSERA statistical significance and treatment-effect magnitude as review issues, not filing issues
  • NDA strategy relies on Phase 3 PROSERA, Phase 2 TORREY, and supportive analyses
  • Potential FDA approval decision in Q3 2027 if the NDA is accepted for filing
  • FDA approvability remains uncertain pending review of the complete NDA

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