SEC Filings for Quantum-Si Inc (QSI)

Last updated: 2026-03-25 13:09 UTC | Total filings: 427

Browse the latest SEC filings and forms submitted by Quantum-Si Inc (QSI). Access annual reports, quarterly statements, and other official disclosures.

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Form Filing Date Description Link
4 March 24, 2026 FORM 4 View Document
144 March 24, 2026 - View Document
4 March 24, 2026 FORM 4 View Document
4 March 24, 2026 FORM 4 View Document
4 March 24, 2026 FORM 4 View Document
144 March 24, 2026 - View Document
144 March 24, 2026 - View Document
144 March 24, 2026 - View Document
4 March 16, 2026 FORM 4 View Document
4 March 16, 2026 FORM 4 View Document
4 March 16, 2026 FORM 4 View Document
4 March 16, 2026 FORM 4 View Document
4 March 9, 2026 FORM 4 View Document
4 March 9, 2026 FORM 4 View Document
S-8 March 3, 2026 S-8 View Document
8-K March 3, 2026 8-K View Document
10-K March 3, 2026 10-K View Document
4 Feb. 26, 2026 FORM 4 View Document
8-K Dec. 29, 2025 8-K View Document
4 Dec. 22, 2025 PRIMARY DOCUMENT View Document
144 Dec. 22, 2025 - View Document
4 Dec. 22, 2025 PRIMARY DOCUMENT View Document
144 Dec. 22, 2025 - View Document
144 Dec. 22, 2025 - View Document
4 Dec. 22, 2025 PRIMARY DOCUMENT View Document
4 Dec. 22, 2025 PRIMARY DOCUMENT View Document
144 Dec. 22, 2025 - View Document
8-K Nov. 20, 2025 8-K View Document
10-Q Nov. 5, 2025 10-Q View Document
8-K Nov. 5, 2025 8-K View Document
SCHEDULE 13G/A Oct. 30, 2025 - View Document
424B3 Oct. 29, 2025 424B3 View Document
144 Oct. 20, 2025 - View Document
144 Oct. 20, 2025 - View Document
144 Oct. 20, 2025 - View Document
144 Oct. 20, 2025 - View Document
144 Oct. 20, 2025 - View Document
4 Oct. 17, 2025 FORM 4 View Document
144 Oct. 16, 2025 - View Document
S-3/A Oct. 9, 2025 S-3/A View Document
8-K Sept. 29, 2025 8-K View Document
8-K Sept. 26, 2025 8-K View Document
S-3 Sept. 26, 2025 S-3 View Document
4 Sept. 24, 2025 FORM 4 View Document
4 Sept. 24, 2025 FORM 4 View Document
4 Sept. 24, 2025 FORM 4 View Document
4 Sept. 24, 2025 FORM 4 View Document
4 Sept. 24, 2025 FORM 4 View Document
SCHEDULE 13D/A Sept. 11, 2025 - View Document
8-K Aug. 8, 2025 8-K View Document
10-Q Aug. 5, 2025 10-Q View Document
8-K Aug. 5, 2025 8-K View Document
SCHEDULE 13G July 29, 2025 - View Document
424B5 July 7, 2025 424B5 View Document
8-K July 7, 2025 8-K View Document
424B5 July 7, 2025 424B5 View Document
4 June 24, 2025 FORM 4 View Document
4 June 24, 2025 FORM 4 View Document
4 June 24, 2025 FORM 4 View Document
4 June 24, 2025 FORM 4 View Document
SCHEDULE 13G/A June 6, 2025 - View Document
SD May 22, 2025 SD View Document
4 May 21, 2025 FORM 4 View Document
4 May 21, 2025 FORM 4 View Document
4 May 21, 2025 FORM 4 View Document
4 May 21, 2025 FORM 4 View Document
4 May 21, 2025 FORM 4 View Document
4 May 21, 2025 FORM 4 View Document
4 May 21, 2025 FORM 4 View Document
4 May 21, 2025 FORM 4 View Document
4 May 21, 2025 FORM 4 View Document
8-K May 19, 2025 8-K View Document
8-K May 15, 2025 8-K View Document
10-Q May 15, 2025 10-Q View Document
SCHEDULE 13G/A May 14, 2025 - View Document
8-K April 10, 2025 8-K View Document
4 March 24, 2025 FORM 4 View Document
4 March 24, 2025 FORM 4 View Document
4 March 24, 2025 FORM 4 View Document
4 March 24, 2025 FORM 4 View Document
ARS March 20, 2025 ARS View Document
DEFA14A March 20, 2025 DEFA14A View Document
DEF 14A March 20, 2025 DEF 14A View Document
4 March 14, 2025 FORM 4 View Document
4 March 14, 2025 FORM 4 View Document
4 March 14, 2025 FORM 4 View Document
4 March 14, 2025 FORM 4 View Document
4 March 14, 2025 FORM 4 View Document
10-K March 3, 2025 10-K View Document
S-8 March 3, 2025 S-8 View Document
8-K March 3, 2025 8-K View Document
SCHEDULE 13G/A Feb. 14, 2025 - View Document
SCHEDULE 13G/A Feb. 13, 2025 - View Document
SCHEDULE 13G/A Feb. 4, 2025 - View Document
SCHEDULE 13G/A Jan. 10, 2025 - View Document
424B5 Jan. 6, 2025 424B5 View Document
8-K Jan. 6, 2025 8-K View Document
4 Dec. 31, 2024 FORM 4 View Document
SCHEDULE 13D/A Dec. 31, 2024 - View Document
144 Dec. 27, 2024 - View Document
4 Dec. 26, 2024 FORM 4 View Document
8-K Dec. 11, 2024 8-K View Document
424B5 Dec. 11, 2024 424B5 View Document
8-K Dec. 9, 2024 FORM 8-K (IXBRL) View Document
8-K Nov. 22, 2024 8-K View Document
8-K Nov. 21, 2024 8-K View Document
8-K/A Nov. 12, 2024 8-K/A View Document
10-Q Nov. 12, 2024 10-Q View Document
8-K Nov. 12, 2024 8-K View Document
8-K Nov. 8, 2024 8-K View Document
4 Sept. 25, 2024 FORM 4 View Document
3 Sept. 18, 2024 FORM 3 View Document
4 Sept. 18, 2024 FORM 4 View Document
SC 13D/A Sept. 17, 2024 SC 13D/A View Document
8-K Aug. 27, 2024 8-K View Document
4 Aug. 13, 2024 FORM 4 View Document
8-K Aug. 13, 2024 8-K View Document
4 Aug. 13, 2024 FORM 4 View Document
4 Aug. 13, 2024 FORM 4 View Document
4 Aug. 13, 2024 FORM 4 View Document
3 Aug. 12, 2024 FORM 3 View Document
8-K Aug. 7, 2024 8-K View Document
10-Q Aug. 7, 2024 10-Q View Document
SC 13G/A June 28, 2024 SC 13G/A View Document
4 June 25, 2024 FORM 4 View Document
8-K June 25, 2024 8-K View Document
144 June 21, 2024 - View Document
8-K June 7, 2024 8-K View Document
4 June 7, 2024 FORM 4 View Document
3 May 30, 2024 FORM 3 View Document
4 May 30, 2024 FORM 4 View Document
8-K May 30, 2024 8-K View Document
8-K May 24, 2024 8-K View Document
144 May 24, 2024 - View Document
4 May 17, 2024 FORM 4 View Document
4 May 17, 2024 FORM 4 View Document
4 May 17, 2024 FORM 4 View Document
4 May 17, 2024 FORM 4 View Document
4 May 17, 2024 FORM 4 View Document
8-K May 17, 2024 8-K View Document
4 May 17, 2024 FORM 4 View Document
4 May 17, 2024 FORM 4 View Document
4 May 17, 2024 FORM 4 View Document
8-K May 9, 2024 8-K View Document
10-Q May 9, 2024 10-Q View Document
DEFR14A April 30, 2024 - View Document
8-K April 9, 2024 8-K View Document
DEF 14A April 1, 2024 DEF 14A View Document
ARS April 1, 2024 ARS View Document
DEFA14A April 1, 2024 DEFA14A View Document
3 March 25, 2024 FORM 3 View Document
4 March 25, 2024 FORM 4 View Document
PRE 14A March 22, 2024 PRE 14A View Document
8-K March 21, 2024 8-K View Document
4 March 18, 2024 FORM 4 View Document
4 March 18, 2024 FORM 4 View Document
4 March 18, 2024 FORM 4 View Document
4 March 18, 2024 FORM 4 View Document
8-K March 11, 2024 8-K View Document
4 March 6, 2024 FORM 4 View Document
10-K Feb. 29, 2024 10-K View Document
8-K Feb. 29, 2024 8-K View Document
S-8 Feb. 29, 2024 S-8 View Document
SC 13G Feb. 13, 2024 SC 13G View Document
8-K Feb. 5, 2024 8-K View Document
SC 13G Feb. 5, 2024 - View Document
SC 13G/A Jan. 29, 2024 - View Document
SC 13G/A Jan. 29, 2024 SC 13G/A View Document
8-K Nov. 9, 2023 8-K View Document
10-Q Nov. 9, 2023 10-Q View Document
3 Sept. 26, 2023 FORM 3 View Document
4 Sept. 26, 2023 FORM 4 View Document
8-K Sept. 21, 2023 8-K View Document
SC 13D/A Sept. 13, 2023 SC 13D/A View Document
8-K Sept. 5, 2023 8K View Document
8-K Aug. 29, 2023 8-K View Document
EFFECT Aug. 22, 2023 - View Document
UPLOAD Aug. 18, 2023 - View Document
CORRESP Aug. 18, 2023 - View Document
S-3 Aug. 11, 2023 S-3 View Document
8-K Aug. 7, 2023 8-K View Document
10-Q Aug. 7, 2023 10-Q View Document
144 July 28, 2023 - View Document
S-8 July 20, 2023 S-8 View Document
8-K July 20, 2023 8-K View Document
144 July 19, 2023 - View Document
SC 13G/A July 10, 2023 SC 13G/A View Document
8-K June 21, 2023 8-K View Document
8-K June 7, 2023 8-K View Document
3 May 24, 2023 - View Document
4 May 24, 2023 - View Document
8-K May 22, 2023 8-K View Document
3 May 16, 2023 - View Document
4 May 16, 2023 - View Document
4 May 16, 2023 - View Document
4 May 16, 2023 - View Document
4 May 16, 2023 - View Document
4 May 16, 2023 - View Document
4 May 16, 2023 - View Document
3 May 16, 2023 - View Document
4 May 16, 2023 - View Document
8-K May 16, 2023 8-K View Document
10-Q May 11, 2023 10-Q View Document
8-K May 11, 2023 8-K View Document
8-K May 2, 2023 8-K View Document
ARS April 28, 2023 ARS View Document
DEFA14A March 29, 2023 DEFA14A View Document
DEF 14A March 29, 2023 DEF 14A View Document
S-8 March 17, 2023 S-8 View Document
10-K March 17, 2023 10-K View Document
PRE 14A March 17, 2023 PRE 14A View Document
4 March 17, 2023 - View Document
4 March 17, 2023 - View Document
4 March 17, 2023 - View Document
4 March 17, 2023 - View Document
8-K March 15, 2023 8-K View Document
8-K March 13, 2023 8-K View Document
4 March 9, 2023 - View Document
8-K March 6, 2023 8-K View Document
8-K March 2, 2023 8-K View Document
SC 13G/A Feb. 14, 2023 SC 13G/A View Document
SC 13G/A Feb. 10, 2023 SC 13G/A View Document
SC 13G Feb. 3, 2023 - View Document
8-K Jan. 30, 2023 8-K View Document
4 Jan. 18, 2023 - View Document
8-K Jan. 12, 2023 8-K View Document
8-K Jan. 9, 2023 8-K View Document
4 Dec. 22, 2022 - View Document
3 Dec. 22, 2022 - View Document
8-K Dec. 20, 2022 8-K View Document
4 Dec. 16, 2022 - View Document
S-8 Nov. 10, 2022 S-8 View Document
4 Nov. 10, 2022 - View Document
10-Q Nov. 8, 2022 10-Q View Document
8-K Nov. 7, 2022 8-K View Document
3 Oct. 13, 2022 - View Document
8-K Oct. 4, 2022 8-K View Document
4 Aug. 18, 2022 FORM 4 View Document
8-K Aug. 8, 2022 8-K View Document
10-Q Aug. 8, 2022 10-Q View Document
424B3 July 20, 2022 424B3 View Document
424B3 July 20, 2022 424B3 View Document
EFFECT July 18, 2022 - View Document
POS AM July 15, 2022 POS AM View Document
POS462B July 15, 2022 POS462B View Document
SC 13D/A June 28, 2022 SC 13D/A View Document
4 June 21, 2022 FORM 4 View Document
3 June 21, 2022 FORM 3 View Document
4 June 16, 2022 FORM 4 View Document
424B3 June 16, 2022 424B3 View Document
8-K June 16, 2022 8-K View Document
424B3 June 16, 2022 424B3 View Document
4 June 15, 2022 FORM 4 View Document
4 June 15, 2022 FORM 4 View Document
424B3 June 10, 2022 424B3 View Document
424B3 June 10, 2022 424B3 View Document
8-K June 10, 2022 8-K View Document
8-K May 16, 2022 8-K View Document
424B3 May 16, 2022 424B3 View Document
424B3 May 16, 2022 424B3 View Document
4 May 13, 2022 FORM 4 View Document
4 May 13, 2022 FORM 4 View Document
4 May 13, 2022 FORM 4 View Document
4 May 13, 2022 FORM 4 View Document
4 May 13, 2022 FORM 4 View Document
4 May 13, 2022 FORM 4 View Document
3 May 11, 2022 FORM 3 View Document
4 May 11, 2022 FORM 4 View Document
424B3 May 10, 2022 424B3 View Document
10-Q May 10, 2022 10-Q View Document
424B3 May 10, 2022 424B3 View Document
424B3 May 9, 2022 424B3 View Document
8-K May 9, 2022 8-K View Document
424B3 May 9, 2022 424B3 View Document
DEF 14A March 29, 2022 DEF 14A View Document
DEFA14A March 29, 2022 SCHEDULE 14A View Document
4 March 16, 2022 FORM 4 View Document
4 March 16, 2022 FORM 4 View Document
4 March 16, 2022 FORM 4 View Document
4 March 16, 2022 FORM 4 View Document
424B3 March 14, 2022 424B3 View Document
S-1MEF March 11, 2022 S-1MEF View Document
8-K March 8, 2022 8-K View Document
424B3 March 4, 2022 FORM 424B3 View Document
EFFECT March 3, 2022 - View Document
POS AM March 2, 2022 - View Document
S-8 March 1, 2022 S-8 View Document
10-K March 1, 2022 10-K View Document
8-K Feb. 28, 2022 8-K View Document
SC 13G/A Feb. 14, 2022 SC 13G/A View Document
SC 13G/A Feb. 14, 2022 - View Document
8-K Feb. 14, 2022 8-K View Document
SC 13G/A Feb. 14, 2022 - View Document
5 Feb. 10, 2022 FORM 5 View Document
SC 13G/A Feb. 9, 2022 SC 13G/A View Document
SC 13G/A Feb. 9, 2022 FORM SC 13G/A View Document
SC 13G/A Jan. 28, 2022 SC 13G/A View Document
4 Jan. 12, 2022 FORM 4 View Document
4 Jan. 12, 2022 FORM 4 View Document
8-K Jan. 12, 2022 8-K View Document
8-K Jan. 10, 2022 8-K View Document
8-K Jan. 4, 2022 8-K View Document
424B3 Jan. 4, 2022 424B3 View Document
424B3 Nov. 19, 2021 424B3 View Document
10-Q Nov. 15, 2021 10-Q View Document
424B3 Nov. 15, 2021 424B3 View Document
8-K Nov. 10, 2021 8-K View Document
8-K Oct. 19, 2021 8-K View Document
8-K Sept. 29, 2021 8-K View Document
424B3 Sept. 24, 2021 424B3 View Document
8-K Sept. 24, 2021 8-K View Document
SC 13G Sept. 10, 2021 SC 13G View Document
4 Sept. 2, 2021 FORM 4 View Document
S-8 Sept. 2, 2021 S-8 View Document
4 Sept. 2, 2021 FORM 4 View Document
424B3 Aug. 16, 2021 424B3 View Document
10-Q Aug. 16, 2021 10-Q View Document
8-K Aug. 16, 2021 8-K View Document
424B3 July 22, 2021 424B3 View Document
EFFECT July 21, 2021 - View Document
CORRESP July 19, 2021 - View Document
S-1/A July 19, 2021 S-1/A View Document
UPLOAD July 8, 2021 - View Document
8-K July 6, 2021 FORM 8-K View Document
S-1 July 2, 2021 S-1 View Document
8-K June 25, 2021 FORM 8-K View Document
8-K June 24, 2021 FORM 8-K View Document
SC 13D June 21, 2021 SCHEDULE 13D View Document
SC 13D June 21, 2021 SC 13D View Document
425 June 16, 2021 FORM 8-K/A View Document
8-K/A June 16, 2021 FORM 8-K/A View Document
8-K June 15, 2021 FORM 8-K View Document
4 June 15, 2021 OWNERSHIP DOCUMENT View Document
8-K June 15, 2021 FORM 8-K View Document
3 June 14, 2021 OWNERSHIP DOCUMENT View Document
4 June 14, 2021 OWNERSHIP DOCUMENT View Document
4 June 14, 2021 OWNERSHIP DOCUMENT View Document
4 June 14, 2021 OWNERSHIP DOCUMENT View Document
4 June 14, 2021 OWNERSHIP DOCUMENT View Document
4 June 14, 2021 OWNERSHIP DOCUMENT View Document
4 June 14, 2021 OWNERSHIP DOCUMENT View Document
4 June 14, 2021 OWNERSHIP DOCUMENT View Document
4 June 14, 2021 OWNERSHIP DOCUMENT View Document
4 June 14, 2021 OWNERSHIP DOCUMENT View Document
4 June 14, 2021 OWNERSHIP DOCUMENT View Document
4 June 14, 2021 OWNERSHIP DOCUMENT View Document
3 June 14, 2021 OWNERSHIP DOCUMENT View Document
3 June 14, 2021 OWNERSHIP DOCUMENT View Document
3 June 14, 2021 OWNERSHIP DOCUMENT View Document
3 June 14, 2021 OWNERSHIP DOCUMENT View Document
3 June 14, 2021 OWNERSHIP DOCUMENT View Document
3 June 14, 2021 OWNERSHIP DOCUMENT View Document
3 June 14, 2021 OWNERSHIP DOCUMENT View Document
3 June 14, 2021 OWNERSHIP DOCUMENT View Document
3 June 14, 2021 OWNERSHIP DOCUMENT View Document
3 June 14, 2021 OWNERSHIP DOCUMENT View Document
3 June 14, 2021 OWNERSHIP DOCUMENT View Document
3 June 14, 2021 OWNERSHIP DOCUMENT View Document
SC 13D/A June 14, 2021 - View Document
10-Q/A June 10, 2021 FORM 10-Q/A View Document
25-NSE June 10, 2021 - View Document
8-K June 9, 2021 FORM 8-K View Document
8-K June 8, 2021 FORM 8-K View Document
425 June 8, 2021 FORM 8-K View Document
425 June 2, 2021 425 View Document
425 May 27, 2021 425 View Document
10-Q May 24, 2021 FORM 10-Q View Document
NT 10-Q May 18, 2021 NT 10-Q View Document
425 May 17, 2021 425 View Document
424B3 May 14, 2021 424B3 View Document
EFFECT May 14, 2021 - View Document
UPLOAD May 13, 2021 - View Document
S-4/A May 13, 2021 S-4/A View Document
CORRESP May 13, 2021 - View Document
CORRESP May 13, 2021 - View Document
S-4/A May 13, 2021 S-4/A View Document
CORRESP May 13, 2021 - View Document
UPLOAD May 12, 2021 - View Document
S-4/A May 11, 2021 S-4/A View Document
8-K May 10, 2021 FORM 8-K View Document
CORRESP May 10, 2021 - View Document
10-K/A May 10, 2021 FORM 10-K/A View Document
425 May 6, 2021 425 View Document
425 April 29, 2021 425 View Document
425 April 22, 2021 425 View Document
UPLOAD April 21, 2021 - View Document
S-4/A April 7, 2021 S-4/A View Document
CORRESP April 7, 2021 - View Document
10-K March 30, 2021 FORM 10-K View Document
UPLOAD March 26, 2021 - View Document
SC 13G March 15, 2021 SC 13G View Document
S-4 March 1, 2021 S-4 View Document
8-K Feb. 23, 2021 FORM 8-K View Document
425 Feb. 23, 2021 FORM 8-K View Document
SC 13D/A Feb. 22, 2021 - View Document
8-K/A Feb. 19, 2021 FORM 8-K/A View Document
8-K Feb. 18, 2021 FORM 8-K View Document
425 Feb. 18, 2021 FORM 8-K View Document
SC 13G Feb. 16, 2021 - View Document
SC 13G/A Feb. 16, 2021 SC 13G/A View Document
SC 13G Feb. 9, 2021 FORM SC 13G View Document
SC 13G/A Jan. 29, 2021 SC 13G/A View Document
10-Q Nov. 13, 2020 FORM 10-Q View Document
8-K Oct. 23, 2020 FORM 8-K View Document
SC 13G Oct. 5, 2020 SC 13G View Document
SC 13D Sept. 21, 2020 - View Document
SC 13G Sept. 16, 2020 SC 13G View Document
SC 13D Sept. 15, 2020 SC 13D View Document
8-K Sept. 15, 2020 FORM 8-K View Document
8-K Sept. 9, 2020 FORM 8-K View Document
424B4 Sept. 4, 2020 424B4 View Document
CERT Sept. 3, 2020 - View Document
3 Sept. 3, 2020 3 View Document
3 Sept. 3, 2020 3 View Document
3 Sept. 3, 2020 3 View Document
3 Sept. 3, 2020 3 View Document
EFFECT Sept. 3, 2020 - View Document
3 Sept. 3, 2020 3 View Document
8-A12B Sept. 2, 2020 8-A12B View Document
CORRESP Sept. 1, 2020 - View Document
CORRESP Sept. 1, 2020 - View Document
S-1/A Aug. 31, 2020 S-1/A View Document
CORRESP Aug. 31, 2020 - View Document
UPLOAD Aug. 18, 2020 - View Document
S-1/A Aug. 10, 2020 S-1/A View Document
S-1 Aug. 3, 2020 S-1 View Document
DRS July 2, 2020 - View Document