---
schema_version: "secwatch.filing_event.v1"
accession: "0001493152-26-034079"
form_type: "8-K"
ticker: "TNXP"
cik: "0001430306"
company_name: "Tonix Pharmaceuticals Holding Corp."
filed_at: "2026-07-21T20:05:30+00:00"
generated_at: "2026-07-21T20:07:34.649709+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.5
calibrated_materiality_score: 0.5
confidence: "high"
source: SEC EDGAR
---

# Tonix Pharmaceuticals CMO Dr. Gregory Sullivan to retire effective Aug 20, 2026

## Summary
- Dr. Gregory M. Sullivan informed Tonix of his retirement as Chief Medical Officer.
- Retirement effective August 20, 2026.
- No successor has been named as of the filing date.
- Departure is a planned retirement, not a termination.

## SEC filing metadata
- accession: 0001493152-26-034079
- form_type: 8-K
- ticker: TNXP
- cik: 0001430306
- company_name: Tonix Pharmaceuticals Holding Corp.
- filed_at: 2026-07-21T20:05:30+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/1430306/000149315226034079/0001493152-26-034079-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1430306/000149315226034079/form8-k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001493152-26-034079
- JSON: https://secwatch.observer/filing/0001493152-26-034079.json
- Plain text: https://secwatch.observer/filing/0001493152-26-034079.txt

## Key facts
- Executive change
  Dr. Gregory M. Sullivan departed as Chief Medical Officer at Tonix Pharmaceuticals Holding Corp..
  - Action: retire
  - Role: Chief Medical Officer
  source text: On July 20, 2026, Dr. Gregory M. Sullivan informed Tonix Pharmaceuticals Holding Corp. (the “Company”) that he will retire from his role as Chief Medical Officer of the Company, effective August 20, 2026.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1430306/000149315226034079/0001493152-26-034079-index.htm

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