---
schema_version: "secwatch.filing_event.v1"
accession: "0001326190-25-000067"
form_type: "8-K"
ticker: "ALT"
cik: "0001326190"
company_name: "Altimmune, Inc."
filed_at: "2025-11-06T23:59:59+00:00"
generated_at: "2026-05-16T23:26:54.949906+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# Altimmune enters $200M ATM equity distribution agreement with Leerink Partners; terminates prior $150M ATM

## Summary
- Entered November 2025 Agreement with Leerink Partners for ATM offering of up to $200M common stock.
- Sales agent Leerink receives 3% commission on gross proceeds of shares sold under the program.
- Prior February 2025 ATM program (up to $150M) terminated effective November 6, 2025 without penalties.
- Shares sold through Nasdaq Global Market under Rule 415(a)(4) at the company's discretion.

## SEC filing metadata
- accession: 0001326190-25-000067
- form_type: 8-K
- ticker: ALT
- cik: 0001326190
- company_name: Altimmune, Inc.
- filed_at: 2025-11-06T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 1.01, 1.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1326190/000132619025000067/0001326190-25-000067-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1326190/000132619025000067/alt-20251106x8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001326190-25-000067
- JSON: https://secwatch.observer/filing/0001326190-25-000067.json
- Plain text: https://secwatch.observer/filing/0001326190-25-000067.txt

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