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Offerings // Arqit Quantum Inc.

ARQQW offering history

Every offering-related filing in Arqit Quantum Inc.’s recent SEC record — registrations (announced capacity) kept separate from pricing documents (executed sales). Reviewed 435 filings back to May 12, 2021.

Last executed offering
Jan 26, 2026
424B5 — priced deal (shares or notes)
Last registration (announced)
Jan 23, 2026
F-3/A — capacity, not a sale
Executed, last 12 months
2
424B pricings + 8-K 3.02 sales
Registered, last 12 months
4
S-1/S-3/F-series registrations
DateFilingWhat it means
May 21, 2026424B3 →UPDATEProspectus update — often a resale registration, not necessarily new capital
Jan 26, 2026424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Jan 26, 2026EFFECT →EFFECTIVESEC declared a registration effective — selling can begin
Jan 23, 2026F-3/A →REGISTEREDF-3/A registration — capacity to sell shares, not a sale yet
Jan 12, 2026F-3 →REGISTEREDF-3 registration — capacity to sell shares, not a sale yet
Dec 9, 2025424B3 →UPDATEProspectus update — often a resale registration, not necessarily new capital
Dec 9, 2025424B3 →UPDATEProspectus update — often a resale registration, not necessarily new capital
Sep 19, 2025424B3 →UPDATEProspectus update — often a resale registration, not necessarily new capital
Sep 19, 2025EFFECT →EFFECTIVESEC declared a registration effective — selling can begin
Sep 15, 2025424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Sep 15, 2025F-3/A →REGISTEREDF-3/A registration — capacity to sell shares, not a sale yet
Aug 29, 2025F-3 →REGISTEREDF-3 registration — capacity to sell shares, not a sale yet
May 22, 2025424B3 →UPDATEProspectus update — often a resale registration, not necessarily new capital
Jan 29, 2025424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Jan 29, 2025EFFECT →EFFECTIVESEC declared a registration effective — selling can begin
Jan 17, 2025F-3 →REGISTEREDF-3 registration — capacity to sell shares, not a sale yet
Dec 3, 2024424B3 →UPDATEProspectus update — often a resale registration, not necessarily new capital
Oct 1, 2024424B3 →UPDATEProspectus update — often a resale registration, not necessarily new capital
Oct 1, 2024424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
May 20, 2024424B3 →UPDATEProspectus update — often a resale registration, not necessarily new capital
Apr 15, 2024424B3 →UPDATEProspectus update — often a resale registration, not necessarily new capital
Apr 15, 2024424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Sep 11, 2023424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Sep 8, 2023424B3 →UPDATEProspectus update — often a resale registration, not necessarily new capital
May 17, 2023424B3 →UPDATEProspectus update — often a resale registration, not necessarily new capital
Feb 21, 2023424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Dec 30, 2022424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Dec 30, 2022EFFECT →EFFECTIVESEC declared a registration effective — selling can begin
Dec 28, 2022F-3/A →REGISTEREDF-3/A registration — capacity to sell shares, not a sale yet
Dec 14, 2022F-3 →REGISTEREDF-3 registration — capacity to sell shares, not a sale yet
Nov 22, 2022424B3 →UPDATEProspectus update — often a resale registration, not necessarily new capital
Nov 22, 2022EFFECT →EFFECTIVESEC declared a registration effective — selling can begin
May 12, 2022424B3 →UPDATEProspectus update — often a resale registration, not necessarily new capital
Dec 23, 2021424B3 →UPDATEProspectus update — often a resale registration, not necessarily new capital
Dec 23, 2021EFFECT →EFFECTIVESEC declared a registration effective — selling can begin
Oct 12, 2021424B3 →UPDATEProspectus update — often a resale registration, not necessarily new capital
Oct 12, 2021EFFECT →EFFECTIVESEC declared a registration effective — selling can begin
Oct 8, 2021F-1/A →REGISTEREDF-1/A registration — capacity to sell shares, not a sale yet
Oct 1, 2021F-1 →REGISTEREDF-1 registration — capacity to sell shares, not a sale yet
Aug 30, 2021424B3 →UPDATEProspectus update — often a resale registration, not necessarily new capital
ARQQW 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 ARQQW workspace →
ARQQW offering FAQ

When did ARQQW last execute an offering?

Per SEC filings, Arqit Quantum Inc.'s most recent priced offering document is a 424B5 filed 2026-01-26. Note a 424B takedown can price shares or notes (debt) — the linked document says which.

When did ARQQW last announce or register an offering?

The most recent registration is a F-3/A filed 2026-01-23. 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.