Offerings // Pulmatrix, Inc.

PULM offering history

Every offering-related filing in Pulmatrix, Inc.’s recent SEC record — registrations (announced capacity) kept separate from pricing documents (executed sales). Reviewed 653 filings back to May 24, 2013.

Last executed offering

Mar 27, 2026

8-K — priced deal (shares or notes)

Last registration (announced)

Oct 5, 2026

S-3/A — capacity, not a sale

Executed, last 12 months

424B pricings + 8-K 3.02 sales

Registered, last 12 months

S-1/S-3/F-series registrations

Date	Filing		What it means
Oct 26, 2026	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Oct 22, 2026	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Oct 7, 2026	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Oct 5, 2026	S-3/A →	REGISTERED	S-3/A registration — capacity to sell shares, not a sale yet
Sep 25, 2026	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Sep 25, 2026	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Aug 7, 2026	S-3/A →	REGISTERED	S-3/A registration — capacity to sell shares, not a sale yet
Jun 4, 2026	S-3 →	REGISTERED	S-3 registration — capacity to sell shares, not a sale yet
Mar 27, 2026	8-K →	EXECUTED	Unregistered share sale disclosed (8-K item 3.02)
May 9, 2025	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
May 9, 2025	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
May 30, 2024	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
May 17, 2024	S-3 →	REGISTERED	S-3 registration — capacity to sell shares, not a sale yet
Mar 28, 2024	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Aug 9, 2022	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Dec 17, 2021	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Dec 15, 2021	8-K →	EXECUTED	Unregistered share sale disclosed (8-K item 3.02)
Jun 9, 2021	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
May 26, 2021	S-3 →	REGISTERED	S-3 registration — capacity to sell shares, not a sale yet
Feb 16, 2021	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Feb 16, 2021	8-K →	EXECUTED	Unregistered share sale disclosed (8-K item 3.02)
Aug 14, 2020	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Aug 13, 2020	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Aug 7, 2020	S-3 →	REGISTERED	S-3 registration — capacity to sell shares, not a sale yet
Jul 9, 2020	8-K →	EXECUTED	Unregistered share sale disclosed (8-K item 3.02)
Jul 6, 2020	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Jul 2, 2020	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Jun 25, 2020	S-1 →	REGISTERED	S-1 registration — capacity to sell shares, not a sale yet
Apr 20, 2020	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Apr 20, 2020	8-K →	EXECUTED	Unregistered share sale disclosed (8-K item 3.02)
Apr 16, 2020	8-K →	EXECUTED	Unregistered share sale disclosed (8-K item 3.02)
Apr 10, 2019	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Apr 5, 2019	424B4 →	EXECUTED	Final prospectus — offering priced (typical for IPOs and marketed share deals)
Apr 3, 2019	S-1MEF →	REGISTERED	S-1MEF registration — capacity to sell shares, not a sale yet
Apr 3, 2019	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Apr 1, 2019	S-1/A →	REGISTERED	S-1/A registration — capacity to sell shares, not a sale yet
Apr 1, 2019	S-1 →	REGISTERED	S-1 registration — capacity to sell shares, not a sale yet
Mar 19, 2019	S-1 →	REGISTERED	S-1 registration — capacity to sell shares, not a sale yet
Mar 15, 2019	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Mar 12, 2019	S-3 →	REGISTERED	S-3 registration — capacity to sell shares, not a sale yet

PULM offering-related filings from SEC EDGAR, newest first (capped at 40). Each links to the original document.

Two honest limits. (1) A 424B takedown can price shares or notes — EDGAR’s metadata doesn’t say which, so open the document: large investment-grade filers use these mostly for bond deals (no dilution), small-caps mostly for shares. (2) At-the-market (ATM) programs sell shares gradually and individual sales are not separately filed — the visible footprint is the enabling shelf and its 424B5; actual ATM share counts surface later in the 10-Q/10-K share count. Educational information from public filings, not investment advice.

Is a shelf active now? →Do they need money? →Red flags →Full PULM workspace →

PULM offering FAQ

When did PULM last execute an offering?

Per SEC filings, Pulmatrix, Inc.'s most recent priced offering document is a 8-K filed 2026-03-27. Note a 424B takedown can price shares or notes (debt) — the linked document says which.

When did PULM last announce or register an offering?

The most recent registration is a S-3/A filed 2026-10-05. A registration is capacity to sell shares — not a sale.

Does an offering always mean dilution?

Registered direct offerings and shelf takedowns issue new shares and dilute existing holders. Resale registrations (424B3/B7) let existing holders sell and do not create new shares. Secondary sales by insiders also do not dilute. Each row here is labeled with what it is.

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