Offerings // Compass Therapeutics, Inc.

CMPX offering history

Every offering-related filing in Compass Therapeutics, Inc.’s recent SEC record — registrations (announced capacity) kept separate from pricing documents (executed sales). Reviewed 355 filings back to May 30, 2018.

Last executed offering

Aug 13, 2025

424B5 — priced deal (shares or notes)

Last registration (announced)

Dec 30, 2025

S-3 — 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
Jan 7, 2026	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Dec 30, 2025	S-3 →	REGISTERED	S-3 registration — capacity to sell shares, not a sale yet
Aug 13, 2025	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Aug 12, 2025	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Sep 6, 2024	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Aug 30, 2024	S-3 →	REGISTERED	S-3 registration — capacity to sell shares, not a sale yet
Jan 24, 2023	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Jan 20, 2023	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Dec 2, 2022	S-3 →	REGISTERED	S-3 registration — capacity to sell shares, not a sale yet
Nov 2, 2022	8-K →	EXECUTED	Unregistered share sale disclosed (8-K item 3.02)
Aug 1, 2022	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Dec 15, 2021	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Dec 15, 2021	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Nov 3, 2021	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Nov 1, 2021	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Jul 20, 2021	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Jul 9, 2021	S-3 →	REGISTERED	S-3 registration — capacity to sell shares, not a sale yet
Jun 30, 2021	8-K →	EXECUTED	Unregistered share sale disclosed (8-K item 3.02)
Apr 30, 2021	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Mar 11, 2021	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Mar 8, 2021	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Nov 13, 2020	RW →	WITHDRAWN	Registration withdrawn
Nov 9, 2020	S-1/A →	REGISTERED	S-1/A registration — capacity to sell shares, not a sale yet
Nov 9, 2020	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Oct 19, 2020	S-1 →	REGISTERED	S-1 registration — capacity to sell shares, not a sale yet
Sep 25, 2020	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Sep 25, 2020	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Sep 18, 2020	S-1/A →	REGISTERED	S-1/A registration — capacity to sell shares, not a sale yet
Aug 11, 2020	S-1 →	REGISTERED	S-1 registration — capacity to sell shares, not a sale yet
Jun 23, 2020	8-K →	EXECUTED	Unregistered share sale disclosed (8-K item 3.02)

CMPX 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 CMPX workspace →

CMPX offering FAQ

When did CMPX last execute an offering?

Per SEC filings, Compass Therapeutics, Inc.'s most recent priced offering document is a 424B5 filed 2025-08-13. Note a 424B takedown can price shares or notes (debt) — the linked document says which.

When did CMPX last announce or register an offering?

The most recent registration is a S-3 filed 2025-12-30. 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.