Offerings // OmniAb, Inc.

OABI offering history

Every offering-related filing in OmniAb, Inc.’s recent SEC record — registrations (announced capacity) kept separate from pricing documents (executed sales). Reviewed 383 filings back to Mar 19, 2021.

Last executed offering

Aug 25, 2025

8-K — priced deal (shares or notes)

Last registration (announced)

Sep 12, 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
Sep 19, 2025	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Sep 12, 2025	S-3 →	REGISTERED	S-3 registration — capacity to sell shares, not a sale yet
Aug 25, 2025	8-K →	EXECUTED	Unregistered share sale disclosed (8-K item 3.02)
Dec 18, 2023	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Dec 18, 2023	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Dec 8, 2023	S-3 →	REGISTERED	S-3 registration — capacity to sell shares, not a sale yet
Nov 13, 2023	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Nov 2, 2023	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Aug 10, 2023	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
May 10, 2023	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Mar 31, 2023	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Feb 10, 2023	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Feb 10, 2023	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Feb 7, 2023	S-1/A →	REGISTERED	S-1/A registration — capacity to sell shares, not a sale yet
Jan 5, 2023	S-1/A →	REGISTERED	S-1/A registration — capacity to sell shares, not a sale yet
Nov 30, 2022	S-1 →	REGISTERED	S-1 registration — capacity to sell shares, not a sale yet
Nov 7, 2022	8-K →	EXECUTED	Unregistered share sale disclosed (8-K item 3.02)
Sep 30, 2022	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Sep 30, 2022	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Mar 24, 2022	8-K →	EXECUTED	Unregistered share sale disclosed (8-K item 3.02)
Aug 11, 2021	424B4 →	EXECUTED	Final prospectus — offering priced (typical for IPOs and marketed share deals)
Aug 9, 2021	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Jul 28, 2021	S-1/A →	REGISTERED	S-1/A registration — capacity to sell shares, not a sale yet
Jun 17, 2021	S-1 →	REGISTERED	S-1 registration — capacity to sell shares, not a sale yet

OABI 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 OABI workspace →

OABI offering FAQ

When did OABI last execute an offering?

Per SEC filings, OmniAb, Inc.'s most recent priced offering document is a 8-K filed 2025-08-25. Note a 424B takedown can price shares or notes (debt) — the linked document says which.

When did OABI last announce or register an offering?

The most recent registration is a S-3 filed 2025-09-12. 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.