---
schema_version: "secwatch.filing_event.v1"
accession: "0001728117-26-000091"
form_type: "8-K"
ticker: "GOSS"
cik: "0001728117"
company_name: "Gossamer Bio, Inc."
filed_at: "2026-09-09T13:00:49+00:00"
generated_at: "2026-09-09T13:02:08.659179+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Gossamer Bio announces 1-for-80 reverse stock split to regain Nasdaq compliance

## Summary
- Board selected 1-for-80 ratio; effective 11:59 p.m. ET on Sept 10, 2026.
- Split-adjusted trading begins Sept 11, 2026 on Nasdaq under GOSS, new CUSIP 38341P 201.
- Authorized common shares reduced from 4,000,000,000 to 50,000,000; total capital stock to 120,000,000.
- Convertible notes, warrants, and equity awards proportionately adjusted for the 1-for-80 ratio.
- Move aims to regain Nasdaq minimum bid price compliance; fractional shares rounded up.

## SEC filing metadata
- accession: 0001728117-26-000091
- form_type: 8-K
- ticker: GOSS
- cik: 0001728117
- company_name: Gossamer Bio, Inc.
- filed_at: 2026-09-09T13:00:49+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1728117/000172811726000091/0001728117-26-000091-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1728117/000172811726000091/goss-20260909.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001728117-26-000091
- JSON: https://secwatch.observer/filing/0001728117-26-000091.json
- Plain text: https://secwatch.observer/filing/0001728117-26-000091.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.