---
schema_version: "secwatch.filing_event.v1"
accession: "0001728117-26-000040"
form_type: "8-K"
ticker: "GOSS"
cik: "0001728117"
company_name: "Gossamer Bio, Inc."
filed_at: "2026-06-02T12:00:32+00:00"
generated_at: "2026-06-02T12:05:31.356501+00:00"
event_type: "debt"
sentiment: "neutral"
materiality_score: 0.65
calibrated_materiality_score: 0.65
confidence: "high"
source: SEC EDGAR
---

# Gossamer Bio extends early tender deadline for exchange offer; $181M of notes tendered

## Summary
- Early tender deadline extended to 5:00 p.m. ET on June 2, 2026; early settlement expected June 4, 2026.
- $181,052,000 in aggregate principal of 5.00% Convertible Senior Notes due 2027 validly tendered as of June 1.
- Exchange offer requires minimum 98% of aggregate principal to be tendered; withdrawal deadline expired June 1.
- New 7.50% Convertible Senior Secured First Lien Notes due 2030 offered, up to $72.0M principal.
- Up to 317,647,058 shares of common stock (or prefunded warrants) offered as part of exchange consideration.

## SEC filing metadata
- accession: 0001728117-26-000040
- form_type: 8-K
- ticker: GOSS
- cik: 0001728117
- company_name: Gossamer Bio, Inc.
- filed_at: 2026-06-02T12:00:32+00:00
- event_type: debt
- sentiment: neutral
- materiality_score: 0.65
- calibrated_materiality_score: 0.65
- confidence: high
- sec_items: 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1728117/000172811726000040/0001728117-26-000040-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1728117/000172811726000040/goss-20260602.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001728117-26-000040
- JSON: https://secwatch.observer/filing/0001728117-26-000040.json
- Plain text: https://secwatch.observer/filing/0001728117-26-000040.txt

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