As of November 6, 2026, one holder's latest Schedule 13D or 13G filing report owning 5% or more of Pulmatrix, Inc. The largest reported stake is RCM Eos PIPE HOLDINGS, LLC's, at 9.99%. One filing is on record since April 22, 2026 (Schedule 13D, April 22, 2026).
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Pulmatrix, Inc. has 1 Schedule 13D or 13G filing on record since 2026-04-22. 1 holder's latest filing reports 5% or more of common stock, par value $0.0001 per share. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| RCM Eos PIPE HOLDINGS, LLC | 9.99% | 405,358 | SCHEDULE 13D, 2026-04-22 | 2026-04-16 |
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Pulmatrix, Inc. elsewhere on the record
- Form D filing Apr 2026
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Purpose of Transaction (Item 4)
RCM Eos PIPE HOLDINGS, LLC
RCM Eos acquired the securities of Pulmatrix, Inc. (the "Issuer") pursuant to that certain Securities Purchase Agreement, dated March 26, 2026 (the "Purchase Agreement"), which closed on April 16, 2026, pursuant to which RCM Eos purchased the Securities, which are convertible into shares of the Issuer's common stock, par value $0.0001 per share (the "Common Stock") at a ratio of approximately 454.55 shares of Common Stock for each share of Preferred Stock, subject to a 9.99% beneficial ownership blocker, in each case subject to the terms and conditions set forth in the Purchase Agreement and the related Certificate of Designation of the Issuer. RCM Eos made the investment to provide the Issuer with interim financing prior to the consummation of the transactions contemplated by that certain Agreement and Plan of Merger and Reorganization, dated March 26, 2026 (the "Merger Agreement"), by and among the Issuer, PUOS Merger Sub, Inc. and Eos SENOLYTIX, Inc., a Delaware corporation ("Eos"), pursuant to which PUOS Merger Sub, Inc. will merge with and into Eos with Eos surviving the merger as a wholly-owned subsidiary of the Issuer (the "Merger"). In connection with the Purchase Agreement, RCM Eos entered into a Voting Agreement with the Issuer, pursuant to which RCM Eos agreed, subject to the terms thereof, to vote the Preferred Stock and any shares of Common Stock issuable upon conversion thereof in favor of, among other things, approval of the Merger Agreement and the …The first part of Item 4 of the SCHEDULE 13D filed 2026-04-22; the filing has the rest
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2026-04-22 | RCM Eos PIPE HOLDINGS, LLC | 9.99% | SCHEDULE 13D |
Also on the record for Pulmatrix, Inc.
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| April 15, 2026 | Form D, private offering | $1M sold | Form D page | Source |
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.