---
schema_version: "secwatch.filing_event.v1"
accession: "0001493152-26-008449"
form_type: "8-K"
ticker: "PULM"
cik: "0001574235"
company_name: "Pulmatrix, Inc."
filed_at: "2026-03-02T23:59:59+00:00"
generated_at: "2026-05-15T22:39:19.109318+00:00"
event_type: "other_material"
sentiment: "negative"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# Pulmatrix merger with Cullgen terminated; seeks alternative merger opportunities

## Summary
- Cullgen terminated the Merger Agreement on Feb 28, 2026 citing failure to obtain China Securities Regulatory Commission approval.
- No termination fee payable by either party; each will bear its own costs and expenses.
- Pulmatrix continues pursuing alternative reverse merger opportunities, encouraged by industry activity.
- Prior mutual waiver of no-solicitation clause had already allowed each party to explore alternate transactions.

## SEC filing metadata
- accession: 0001493152-26-008449
- form_type: 8-K
- ticker: PULM
- cik: 0001574235
- company_name: Pulmatrix, Inc.
- filed_at: 2026-03-02T23:59:59+00:00
- event_type: other_material
- sentiment: negative
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 1.02, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1574235/000149315226008449/0001493152-26-008449-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1574235/000149315226008449/form8-k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001493152-26-008449
- JSON: https://secwatch.observer/filing/0001493152-26-008449.json
- Plain text: https://secwatch.observer/filing/0001493152-26-008449.txt

## Key facts
- Material Agreements
  Pulmatrix, Inc. terminated Agreement and Plan of Merger and Reorganization with Cullgen Inc. (effective 2026-02-28).
  - Action: termination
  - Agreement: merger
  - Counterparty: Cullgen Inc.
  - Effective: 2026-02-28
  source text: Pulmatrix, Inc. (the “ Company ” or “ Pulmatrix ”) received a termination notice (the “ Notice ”) from Cullgen Inc. (“ Cullgen ”) pursuant to which Cullgen informed the Company that in accordance with Sections 11.7 and 10.1(b) of that certain Agreement and Plan of Merger and Reorganization, dated as of November 13, 2024, as amended by Amendment No. 1 thereto dated as of April 7, 2025 (the “ Merger Agreement ”), by and among the Company, Pulmatrix and PCL Merger Sub, Inc. and PCL Merger Sub Inc. II, LLC, Cullgen was terminating the Merger Agreement and all related transactions thereunder.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1574235/000149315226008449/0001493152-26-008449-index.htm

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