Offerings // Quantum-Si Inc

QSI offering history

Every offering-related filing in Quantum-Si Inc’s recent SEC record — registrations (announced capacity) kept separate from pricing documents (executed sales). Reviewed 461 filings back to Jul 2, 2020.

Last executed offering

Jul 7, 2025

424B5 — priced deal (shares or notes)

Last registration (announced)

Oct 9, 2025

S-3/A — 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 29, 2025	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Oct 9, 2025	S-3/A →	REGISTERED	S-3/A registration — capacity to sell shares, not a sale yet
Sep 26, 2025	S-3 →	REGISTERED	S-3 registration — capacity to sell shares, not a sale yet
Jul 7, 2025	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Jul 7, 2025	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Jan 6, 2025	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Dec 11, 2024	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Aug 22, 2023	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Aug 11, 2023	S-3 →	REGISTERED	S-3 registration — capacity to sell shares, not a sale yet
Jul 20, 2022	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Jul 20, 2022	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Jul 18, 2022	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Jun 16, 2022	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Jun 16, 2022	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Jun 10, 2022	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Jun 10, 2022	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
May 16, 2022	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
May 16, 2022	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
May 10, 2022	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
May 10, 2022	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
May 9, 2022	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
May 9, 2022	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Mar 14, 2022	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Mar 11, 2022	S-1MEF →	REGISTERED	S-1MEF registration — capacity to sell shares, not a sale yet
Mar 4, 2022	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Mar 3, 2022	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Jan 4, 2022	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Nov 19, 2021	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
Sep 24, 2021	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Aug 16, 2021	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Jul 22, 2021	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Jul 21, 2021	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Jul 19, 2021	S-1/A →	REGISTERED	S-1/A registration — capacity to sell shares, not a sale yet
Jul 2, 2021	S-1 →	REGISTERED	S-1 registration — capacity to sell shares, not a sale yet
Jun 15, 2021	8-K →	EXECUTED	Unregistered share sale disclosed (8-K item 3.02)
May 14, 2021	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
May 14, 2021	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Feb 18, 2021	8-K →	EXECUTED	Unregistered share sale disclosed (8-K item 3.02)
Sep 9, 2020	8-K →	EXECUTED	Unregistered share sale disclosed (8-K item 3.02)

QSI 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 QSI workspace →

QSI offering FAQ

When did QSI last execute an offering?

Per SEC filings, Quantum-Si Inc's most recent priced offering document is a 424B5 filed 2025-07-07. Note a 424B takedown can price shares or notes (debt) — the linked document says which.

When did QSI last announce or register an offering?

The most recent registration is a S-3/A filed 2025-10-09. 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.