Pulmatrix, INC. 8-K Filing

Ticker: PULM · Form: 8-K · Filed: Dec 18, 2025 · CIK: 1574235

Sentiment: neutral

Filing Stats: 708 words · 3 min read · ~2 pages · Grade level 11.4 · Accepted 2025-12-18 08:05:51

Key Financial Figures

Filing Documents

01. Other Events

Item 8.01. Other Events On December 17, 2025, the Company, Cullgen and PLC Merger Sub, Inc. (collectively, the " Parties ") entered into that certain mutual waiver agreement (the " Waiver Agreement "), pursuant to which the Parties agreed to mutually waive compliance with Section 5.4 of the Merger Agreement, which such provision imposes restrictions on each party during the Pre-Closing Period (as defined in the Merger Agreement). Except as expressly waived pursuant to the Waiver Agreement, the Merger Agreement remains in full force and effect in all respects, and no other provision of the Merger Agreement has otherwise been amended, waived, or modified. Item 9.01 Financial Statements and Exhibits. (d) Exhibits Exhibit No. Description 99.1 Press Release dated December 18, 2025 (furnished pursuant to Item 7.01) 104 Cover Page Interactive Data File (formatted as Inline XBRL)

SIGNATURES

SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. PULMATRIX, INC. Date: December 18, 2025 By: /s/ Peter Ludlum Peter Ludlum Interim Chief Executive Officer and Interim Chief Financial Officer

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