---
schema_version: "secwatch.filing_event.v1"
accession: "0001641172-25-003216"
form_type: "8-K"
ticker: "PULM"
cik: "0001574235"
company_name: "Pulmatrix, Inc."
filed_at: "2025-04-08T23:59:59+00:00"
generated_at: "2026-05-23T19:02:02.672734+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.25
calibrated_materiality_score: 0.15
confidence: "high"
source: SEC EDGAR
---

# Pulmatrix auditor change: Marcum resigns, CBIZ engaged effective April 4, 2025

## Summary
- Marcum LLP resigned as independent auditor on April 4, 2025; no adverse opinions or disagreements in prior reports.
- Audit Committee approved engagement of CBIZ CPAs P.C. as new independent auditor for fiscal 2025.
- Auditor transition follows CBIZ’s November 2024 acquisition of Marcum’s attest business.
- No reportable events or disagreements occurred during 2023, 2024, or interim period through April 4, 2025.

## SEC filing metadata
- accession: 0001641172-25-003216
- form_type: 8-K
- ticker: PULM
- cik: 0001574235
- company_name: Pulmatrix, Inc.
- filed_at: 2025-04-08T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.25
- calibrated_materiality_score: 0.15
- confidence: high
- sec_items: 5.07, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1574235/000164117225003216/0001641172-25-003216-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1574235/000164117225003216/form8-k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001641172-25-003216
- JSON: https://secwatch.observer/filing/0001641172-25-003216.json
- Plain text: https://secwatch.observer/filing/0001641172-25-003216.txt

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