---
schema_version: "secwatch.filing_event.v1"
accession: "0001728117-26-000094"
form_type: "8-K"
ticker: "GOSS"
cik: "0001728117"
company_name: "Gossamer Bio, Inc."
filed_at: "2026-09-11T12:01:39+00:00"
generated_at: "2026-09-11T12:05:06.689900+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

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

## Summary
- 1-for-80 reverse split effective 9/10/2026; split-adjusted trading begins 9/11 under GOSS, new CUSIP 38341P 201.
- Authorized common reduced from 4B to 50M shares; total capital stock from 4.07B to 120M.
- Convertible note conversion rates (5.00% 2027, 7.50% 2030 notes) and warrant/equity award exercise prices proportionally adjusted.
- Intended to regain Nasdaq $1.00 minimum bid price; needs 10 consecutive days by compliance date Oct 5, 2026.

## SEC filing metadata
- accession: 0001728117-26-000094
- form_type: 8-K
- ticker: GOSS
- cik: 0001728117
- company_name: Gossamer Bio, Inc.
- filed_at: 2026-09-11T12:01:39+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 3.03, 5.03, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1728117/000172811726000094/0001728117-26-000094-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1728117/000172811726000094/goss-20260910.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001728117-26-000094
- JSON: https://secwatch.observer/filing/0001728117-26-000094.json
- Plain text: https://secwatch.observer/filing/0001728117-26-000094.txt

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