Offerings // Disc Medicine, Inc.

IRON offering history

Every offering-related filing in Disc Medicine, Inc.’s recent SEC record — registrations (announced capacity) kept separate from pricing documents (executed sales). Reviewed 736 filings back to Jul 2, 2020.

Last executed offering

Oct 21, 2025

424B5 — priced deal (shares or notes)

Last registration (announced)

Aug 8, 2024

S-3ASR — 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 21, 2025	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Oct 20, 2025	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Jan 23, 2025	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Jan 21, 2025	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Nov 19, 2024	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Nov 15, 2024	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Aug 8, 2024	S-3ASR →	REGISTERED	Automatic shelf registration — effective immediately (large filers)
Jun 14, 2024	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Dec 6, 2023	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Dec 5, 2023	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Nov 29, 2023	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Nov 20, 2023	S-3 →	REGISTERED	S-3 registration — capacity to sell shares, not a sale yet
Oct 10, 2023	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Jun 15, 2023	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Jun 12, 2023	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Feb 14, 2023	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Jan 25, 2023	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Jan 24, 2023	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Jan 24, 2023	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Jan 18, 2023	S-3 →	REGISTERED	S-3 registration — capacity to sell shares, not a sale yet
Jan 18, 2023	S-3 →	REGISTERED	S-3 registration — capacity to sell shares, not a sale yet
Dec 29, 2022	8-K →	EXECUTED	Unregistered share sale disclosed (8-K item 3.02)
Dec 2, 2022	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Dec 2, 2022	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Mar 14, 2022	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Feb 28, 2022	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Jan 14, 2022	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Jan 10, 2022	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Nov 15, 2021	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Nov 12, 2021	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Oct 6, 2021	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Oct 1, 2021	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Sep 9, 2021	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Aug 17, 2021	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Aug 12, 2021	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Jun 23, 2021	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
May 13, 2021	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
May 12, 2021	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Apr 28, 2021	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Mar 29, 2021	S-1/A →	REGISTERED	S-1/A registration — capacity to sell shares, not a sale yet

IRON 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.

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IRON offering FAQ

When did IRON last execute an offering?

Per SEC filings, Disc Medicine, Inc.'s most recent priced offering document is a 424B5 filed 2025-10-21. Note a 424B takedown can price shares or notes (debt) — the linked document says which.

When did IRON last announce or register an offering?

The most recent registration is a S-3ASR filed 2024-08-08. 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.