---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-26-021727"
form_type: "8-K"
ticker: "ATOS"
cik: "0001488039"
company_name: "ATOSSA THERAPEUTICS, INC."
filed_at: "2026-01-26T23:59:59+00:00"
generated_at: "2026-05-16T07:54:39.443100+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.5
calibrated_materiality_score: 0.5
confidence: "high"
source: SEC EDGAR
---

# Atossa shareholders approve 15:1 reverse stock split effective Feb 2, 2026

## Summary
- Approved at Special Meeting: 33.7M for, 27.9M against, 0.1M abstentions; no broker non-votes.
- Board set ratio at 15:1; effective 12:01 a.m. ET on Feb 2, 2026; trading begins on split-adjusted basis same day.
- No fractional shares issued; cash paid in lieu based on Jan 30, 2026 closing price adjusted for split ratio.
- Proportionate adjustments to outstanding equity awards, exercise prices, and Series B Preferred conversion price.
- Par value remains $0.18 per share; CUSIP changes to 04962H704; ticker ATOS unchanged.

## SEC filing metadata
- accession: 0001193125-26-021727
- form_type: 8-K
- ticker: ATOS
- cik: 0001488039
- company_name: ATOSSA THERAPEUTICS, INC.
- filed_at: 2026-01-26T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.5
- calibrated_materiality_score: 0.5
- confidence: high
- sec_items: 3.03, 5.03, 5.07, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1488039/000119312526021727/0001193125-26-021727-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1488039/000119312526021727/atos-20260120.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-26-021727
- JSON: https://secwatch.observer/filing/0001193125-26-021727.json
- Plain text: https://secwatch.observer/filing/0001193125-26-021727.txt

## Source-grounded claims
- claim_id: 5ae4e64b622b8c99a47aefa18d7ac686e4beb33a
  claim: ATOSSA THERAPEUTICS, INC.: Approved a 15:1 reverse stock split of common stock and filed an amendment to the Amended and Restated Certificate of Incorporation with the Delaware Secretary of State, effective February 2, 2026 (effective 2026-02-02).
  evidence_excerpt: the Company filed an amendment to its Amended and Restated Certificate of Incorporation, as amended (the “Certificate of Incorporation”), with the Secretary of State of the State of Delaware (the “Amendment”).
  evidence_url: https://www.sec.gov/Archives/edgar/data/1488039/000119312526021727/0001193125-26-021727-index.htm

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