Offerings // Protagonist Therapeutics, Inc

PTGX offering history

Every offering-related filing in Protagonist Therapeutics, Inc’s recent SEC record — registrations (announced capacity) kept separate from pricing documents (executed sales). Reviewed 699 filings back to Sep 28, 2006.

Last executed offering

Aug 11, 2023

424B5 — priced deal (shares or notes)

Last registration (announced)

Aug 6, 2025

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
Aug 6, 2025	S-3ASR →	REGISTERED	Automatic shelf registration — effective immediately (large filers)
Aug 11, 2023	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Apr 6, 2023	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Apr 4, 2023	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Aug 16, 2022	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Aug 5, 2022	S-3 →	REGISTERED	S-3 registration — capacity to sell shares, not a sale yet
Jun 17, 2021	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Jun 14, 2021	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Dec 14, 2020	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Dec 10, 2020	S-3ASR →	REGISTERED	Automatic shelf registration — effective immediately (large filers)
Dec 10, 2020	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
May 13, 2020	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
May 11, 2020	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Nov 27, 2019	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Nov 22, 2019	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Oct 31, 2019	S-3 →	REGISTERED	S-3 registration — capacity to sell shares, not a sale yet
Dec 31, 2018	8-K →	EXECUTED	Unregistered share sale disclosed (8-K item 3.02)
Sep 26, 2018	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Sep 21, 2018	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Sep 7, 2018	S-3 →	REGISTERED	S-3 registration — capacity to sell shares, not a sale yet
Aug 7, 2018	8-K →	EXECUTED	Unregistered share sale disclosed (8-K item 3.02)
Aug 7, 2018	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Oct 13, 2017	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Oct 11, 2017	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Oct 5, 2017	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Sep 1, 2017	S-3 →	REGISTERED	S-3 registration — capacity to sell shares, not a sale yet
Aug 12, 2016	424B4 →	EXECUTED	Final prospectus — offering priced (typical for IPOs and marketed share deals)
Aug 10, 2016	S-1MEF →	REGISTERED	S-1MEF registration — capacity to sell shares, not a sale yet
Aug 10, 2016	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Aug 9, 2016	S-1/A →	REGISTERED	S-1/A registration — capacity to sell shares, not a sale yet
Aug 1, 2016	S-1/A →	REGISTERED	S-1/A registration — capacity to sell shares, not a sale yet
Jul 11, 2016	S-1 →	REGISTERED	S-1 registration — capacity to sell shares, not a sale yet

PTGX 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 PTGX workspace →

PTGX offering FAQ

When did PTGX last execute an offering?

Per SEC filings, Protagonist Therapeutics, Inc's most recent priced offering document is a 424B5 filed 2023-08-11. Note a 424B takedown can price shares or notes (debt) — the linked document says which.

When did PTGX last announce or register an offering?

The most recent registration is a S-3ASR filed 2025-08-06. 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.