---
schema_version: "secwatch.filing_event.v1"
accession: "0001437749-23-027849"
form_type: "8-K"
ticker: "ATOS"
cik: "0001488039"
company_name: "ATOSSA THERAPEUTICS, INC."
filed_at: "2023-10-06T23:59:59+00:00"
generated_at: "2026-06-10T03:21:05.864203+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.5
calibrated_materiality_score: 0.5
confidence: "high"
source: SEC EDGAR
---

# Atossa Therapeutics CFO Greg Weaver resigns; Heather Rees appointed as principal financial officer

## Summary
- Greg Weaver resigned as EVP and CFO effective Oct 5, 2023; resignation not due to disagreement with company.
- Company waived 30-day notice period, accelerating departure to Oct 5.
- Heather Rees, previously VP Finance and Accounting, appointed as principal financial and accounting officer.
- Rees has been with company since 2017 as controller, then VP; prior experience includes Deloitte and independent consulting.
- Weaver's termination also served as resignation from Board of Directors.

## SEC filing metadata
- accession: 0001437749-23-027849
- form_type: 8-K
- ticker: ATOS
- cik: 0001488039
- company_name: ATOSSA THERAPEUTICS, INC.
- filed_at: 2023-10-06T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.5
- calibrated_materiality_score: 0.5
- confidence: high
- sec_items: 5.02
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1488039/000143774923027849/0001437749-23-027849-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1488039/000143774923027849/atos20231003_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001437749-23-027849
- JSON: https://secwatch.observer/filing/0001437749-23-027849.json
- Plain text: https://secwatch.observer/filing/0001437749-23-027849.txt

## Key facts
- Executive change
  Greg Weaver resigned as Executive Vice President and Chief Financial Officer at ATOSSA THERAPEUTICS, INC..
  - Action: resigned
  - Role: Executive Vice President and Chief Financial Officer
  source text: Mr. Weaver tendered his resignation to pursue other opportunities and not due to any disagreement with the Company.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1488039/000143774923027849/0001437749-23-027849-index.htm
- Executive change
  Heather Rees was appointed as principal financial and accounting officer at ATOSSA THERAPEUTICS, INC..
  - Action: appointed
  - Role: principal financial and accounting officer
  source text: In connection with Mr. Weaver’s resignation, the Company has appointed Heather Rees, age 51, as the Company’s principal financial and accounting officer.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1488039/000143774923027849/0001437749-23-027849-index.htm
- Executive change
  Greg Weaver resigned as member of the Board of Directors at ATOSSA THERAPEUTICS, INC..
  - Action: resigned
  - Role: member of the Board of Directors
  source text: Mr. Weaver’s termination of service as an employee served as his resignation from all other positions with the Company, including as a member of the Board of Directors.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1488039/000143774923027849/0001437749-23-027849-index.htm

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