Quantum-Si Inc SEC filings QSI
Quantum-Si Inc has 473 filings in SEC EDGAR's recent list, going back to Jul 2, 2020. Its latest annual report, Form ARS, was filed on Apr 1, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Nov 5, 2026, covering the quarter ended Sep 30, 2026. The most recent current report (Form 8-K) was filed on Nov 5, 2026 (results of operations). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| 4 | Insider transaction | Sep 23, 2026 | Sep 21, 2026 |
| 4 | Insider transaction | Sep 23, 2026 | Sep 21, 2026 |
| 4 | Insider transaction | Sep 23, 2026 | Sep 21, 2026 |
| 144 | Notice of proposed sale | Sep 23, 2026 | — |
| 144 | Notice of proposed sale | Sep 23, 2026 | — |
| 144 | Notice of proposed sale | Sep 23, 2026 | — |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Aug 28, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Jul 29, 2026 | — |
| 4 | Insider transaction | Jun 24, 2026 | Jun 22, 2026 |
| 4 | Insider transaction | Jun 24, 2026 | Jun 22, 2026 |
| 4 | Insider transaction | Jun 24, 2026 | Jun 22, 2026 |
| 4 | Insider transaction | Jun 24, 2026 | Jun 22, 2026 |
| 144 | Notice of proposed sale | Jun 24, 2026 | — |
| 144 | Notice of proposed sale | Jun 24, 2026 | — |
| 144 | Notice of proposed sale | Jun 24, 2026 | — |
| 144 | Notice of proposed sale | Jun 24, 2026 | — |
| 4 | Insider transaction | May 20, 2026 | May 18, 2026 |
| 4 | Insider transaction | May 20, 2026 | May 18, 2026 |
| 4 | Insider transaction | May 20, 2026 | May 18, 2026 |
| 4 | Insider transaction | May 20, 2026 | May 18, 2026 |
| 4 | Insider transaction | May 20, 2026 | May 18, 2026 |
| 4 | Insider transaction | May 20, 2026 | May 18, 2026 |
| 4 | Insider transaction | May 20, 2026 | May 18, 2026 |
| 4 | Insider transaction | May 20, 2026 | May 18, 2026 |
| 4 | Insider transaction | May 20, 2026 | May 18, 2026 |
| 4 | Insider transaction | Apr 22, 2026 | Apr 20, 2026 |
| 4 | Insider transaction | Apr 22, 2026 | Apr 20, 2026 |
| 144 | Notice of proposed sale | Apr 22, 2026 | — |
| 144 | Notice of proposed sale | Apr 22, 2026 | — |
| 4 | Insider transaction | Mar 24, 2026 | Mar 20, 2026 |
| 4 | Insider transaction | Mar 24, 2026 | Mar 20, 2026 |
| 4 | Insider transaction | Mar 24, 2026 | Mar 20, 2026 |
| 4 | Insider transaction | Mar 24, 2026 | Mar 20, 2026 |
| 144 | Notice of proposed sale | Mar 24, 2026 | — |
| 144 | Notice of proposed sale | Mar 24, 2026 | — |
| 144 | Notice of proposed sale | Mar 24, 2026 | — |
| 144 | Notice of proposed sale | Mar 24, 2026 | — |
| 4 | Insider transaction | Mar 16, 2026 | Mar 12, 2026 |
| 4 | Insider transaction | Mar 16, 2026 | Mar 12, 2026 |
| 4 | Insider transaction | Mar 16, 2026 | Mar 12, 2026 |
| 4 | Insider transaction | Mar 16, 2026 | Mar 12, 2026 |
| 4 | Insider transaction | Mar 9, 2026 | Mar 5, 2026 |
| 4 | Insider transaction | Mar 9, 2026 | Mar 5, 2026 |
| 4 | Insider transaction | Feb 26, 2026 | Feb 24, 2026 |
| 4 | Insider transaction | Dec 22, 2025 | Dec 22, 2025 |
| 144 | Notice of proposed sale | Dec 22, 2025 | — |
| 4 | Insider transaction | Dec 22, 2025 | Dec 22, 2025 |
| 144 | Notice of proposed sale | Dec 22, 2025 | — |
| 4 | Insider transaction | Dec 22, 2025 | Dec 22, 2025 |
| 144 | Notice of proposed sale | Dec 22, 2025 | — |
| 4 | Insider transaction | Dec 22, 2025 | Dec 22, 2025 |
| 144 | Notice of proposed sale | Dec 22, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Oct 30, 2025 | — |
| 144 | Notice of proposed sale | Oct 20, 2025 | — |
| 144 | Notice of proposed sale | Oct 20, 2025 | — |
| 144 | Notice of proposed sale | Oct 20, 2025 | — |
| 144 | Notice of proposed sale | Oct 20, 2025 | — |
| 144 | Notice of proposed sale | Oct 20, 2025 | — |
| 4 | Insider transaction | Oct 17, 2025 | Oct 16, 2025 |
| 144 | Notice of proposed sale | Oct 16, 2025 | — |
| 4 | Insider transaction | Sep 24, 2025 | Sep 22, 2025 |
| 4 | Insider transaction | Sep 24, 2025 | Sep 22, 2025 |
| 4 | Insider transaction | Sep 24, 2025 | Sep 22, 2025 |
| 4 | Insider transaction | Sep 24, 2025 | Sep 22, 2025 |
| 4 | Insider transaction | Sep 24, 2025 | Sep 22, 2025 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Sep 11, 2025 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Jul 29, 2025 | — |
| 4 | Insider transaction | Jun 24, 2025 | Jun 23, 2025 |
| 4 | Insider transaction | Jun 24, 2025 | Jun 23, 2025 |
| 4 | Insider transaction | Jun 24, 2025 | Jun 23, 2025 |
| 4 | Insider transaction | Jun 24, 2025 | Jun 23, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Jun 6, 2025 | — |
| 4 | Insider transaction | May 21, 2025 | May 19, 2025 |
| 4 | Insider transaction | May 21, 2025 | May 19, 2025 |
| 4 | Insider transaction | May 21, 2025 | May 19, 2025 |
| 4 | Insider transaction | May 21, 2025 | May 19, 2025 |
| 4 | Insider transaction | May 21, 2025 | May 19, 2025 |
| 4 | Insider transaction | May 21, 2025 | May 19, 2025 |
| 4 | Insider transaction | May 21, 2025 | May 19, 2025 |
| 4 | Insider transaction | May 21, 2025 | May 19, 2025 |
| 4 | Insider transaction | May 21, 2025 | May 19, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 14, 2025 | — |
| 4 | Insider transaction | Mar 24, 2025 | Mar 21, 2025 |
| 4 | Insider transaction | Mar 24, 2025 | Mar 21, 2025 |
| 4 | Insider transaction | Mar 24, 2025 | Mar 21, 2025 |
| 4 | Insider transaction | Mar 24, 2025 | Mar 21, 2025 |
| 4 | Insider transaction | Mar 14, 2025 | Mar 12, 2025 |
| 4 | Insider transaction | Mar 14, 2025 | Mar 14, 2025 |
| 4 | Insider transaction | Mar 14, 2025 | Mar 12, 2025 |
| 4 | Insider transaction | Mar 14, 2025 | Mar 12, 2025 |
| 4 | Insider transaction | Mar 14, 2025 | Mar 12, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 14, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 13, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 4, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Jan 10, 2025 | — |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Dec 31, 2024 | — |
| 4 | Insider transaction | Dec 31, 2024 | Dec 27, 2024 |
| 144 | Notice of proposed sale | Dec 27, 2024 | — |
| 4 | Insider transaction | Dec 26, 2024 | Dec 23, 2024 |
| 4 | Insider transaction | Sep 25, 2024 | Sep 23, 2024 |
| 4 | Insider transaction | Sep 18, 2024 | Sep 17, 2024 |
| 3 | Initial insider ownership | Sep 18, 2024 | Sep 17, 2024 |
| SC 13D/A | Amended ownership over 5% (active) | Sep 17, 2024 | — |
| 4 | Insider transaction | Aug 13, 2024 | Aug 9, 2024 |
| 4 | Insider transaction | Aug 13, 2024 | Aug 9, 2024 |
| 4 | Insider transaction | Aug 13, 2024 | Aug 9, 2024 |
| 4 | Insider transaction | Aug 13, 2024 | Aug 9, 2024 |
| 3 | Initial insider ownership | Aug 12, 2024 | Aug 2, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Jun 28, 2024 | — |
| 4 | Insider transaction | Jun 25, 2024 | Jun 21, 2024 |
| 144 | Notice of proposed sale | Jun 21, 2024 | — |
| 4 | Insider transaction | Jun 7, 2024 | Jun 7, 2024 |
| 4 | Insider transaction | May 30, 2024 | May 28, 2024 |
| 3 | Initial insider ownership | May 30, 2024 | May 27, 2024 |
| 144 | Notice of proposed sale | May 24, 2024 | — |
| 4 | Insider transaction | May 17, 2024 | May 16, 2024 |
| 4 | Insider transaction | May 17, 2024 | May 16, 2024 |
| 4 | Insider transaction | May 17, 2024 | May 16, 2024 |
| 4 | Insider transaction | May 17, 2024 | May 16, 2024 |
| 4 | Insider transaction | May 17, 2024 | May 16, 2024 |
| 4 | Insider transaction | May 17, 2024 | May 16, 2024 |
| 4 | Insider transaction | May 17, 2024 | May 16, 2024 |
| 4 | Insider transaction | May 17, 2024 | May 16, 2024 |
| 4 | Insider transaction | Mar 25, 2024 | Mar 22, 2024 |
| 3 | Initial insider ownership | Mar 25, 2024 | Mar 21, 2024 |
| 4 | Insider transaction | Mar 18, 2024 | Mar 15, 2024 |
| 4 | Insider transaction | Mar 18, 2024 | Mar 14, 2024 |
| 4 | Insider transaction | Mar 18, 2024 | Mar 15, 2024 |
| 4 | Insider transaction | Mar 18, 2024 | Mar 15, 2024 |
| 4 | Insider transaction | Mar 6, 2024 | Mar 5, 2024 |
| SC 13G | Ownership over 5% (passive) | Feb 13, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Feb 5, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 29, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 29, 2024 | — |
| 4 | Insider transaction | Sep 26, 2023 | Sep 25, 2023 |
| 3 | Initial insider ownership | Sep 26, 2023 | Sep 22, 2023 |
| SC 13D/A | Amended ownership over 5% (active) | Sep 13, 2023 | — |
| 144 | Notice of proposed sale | Jul 28, 2023 | — |
| 144 | Notice of proposed sale | Jul 19, 2023 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jul 10, 2023 | — |
| 4 | Insider transaction | May 24, 2023 | May 22, 2023 |
| 3 | Initial insider ownership | May 24, 2023 | May 19, 2023 |
| 4 | Insider transaction | May 16, 2023 | May 12, 2023 |
| 4 | Insider transaction | May 16, 2023 | May 12, 2023 |
| 4 | Insider transaction | May 16, 2023 | May 12, 2023 |
| 4 | Insider transaction | May 16, 2023 | May 12, 2023 |
| 4 | Insider transaction | May 16, 2023 | May 15, 2023 |
| 4 | Insider transaction | May 16, 2023 | May 12, 2023 |
| 3 | Initial insider ownership | May 16, 2023 | May 15, 2023 |
| 4 | Insider transaction | May 16, 2023 | May 12, 2023 |
| 3 | Initial insider ownership | May 16, 2023 | May 11, 2023 |
| 4 | Insider transaction | Mar 17, 2023 | Mar 15, 2023 |
| 4 | Insider transaction | Mar 17, 2023 | Mar 15, 2023 |
| 4 | Insider transaction | Mar 17, 2023 | Mar 15, 2023 |
| 4 | Insider transaction | Mar 17, 2023 | Mar 15, 2023 |
| 4 | Insider transaction | Mar 9, 2023 | Mar 8, 2023 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2023 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 10, 2023 | — |
| SC 13G | Ownership over 5% (passive) | Feb 3, 2023 | — |
| 4 | Insider transaction | Jan 18, 2023 | Jan 15, 2023 |
| 4 | Insider transaction | Dec 22, 2022 | Dec 20, 2022 |
| 3 | Initial insider ownership | Dec 22, 2022 | Dec 21, 2022 |
| 4 | Insider transaction | Dec 16, 2022 | Dec 15, 2022 |
| 4 | Insider transaction | Nov 10, 2022 | Nov 9, 2022 |
| 3 | Initial insider ownership | Oct 13, 2022 | Oct 10, 2022 |
| 4 | Insider transaction | Aug 18, 2022 | Aug 17, 2022 |
| SC 13D/A | Amended ownership over 5% (active) | Jun 28, 2022 | — |
| 4 | Insider transaction | Jun 21, 2022 | Jun 16, 2022 |
| 3 | Initial insider ownership | Jun 21, 2022 | Jun 15, 2022 |
| 4 | Insider transaction | Jun 16, 2022 | Jun 14, 2022 |
| 4 | Insider transaction | Jun 15, 2022 | Jun 13, 2022 |
| 4 | Insider transaction | Jun 15, 2022 | Jun 13, 2022 |
| 4 | Insider transaction | May 13, 2022 | May 11, 2022 |
| 4 | Insider transaction | May 13, 2022 | May 11, 2022 |
| 4 | Insider transaction | May 13, 2022 | May 11, 2022 |
| 4 | Insider transaction | May 13, 2022 | May 11, 2022 |
| 4 | Insider transaction | May 13, 2022 | May 11, 2022 |
| 4 | Insider transaction | May 13, 2022 | May 11, 2022 |
| 4 | Insider transaction | May 11, 2022 | May 9, 2022 |
| 3 | Initial insider ownership | May 11, 2022 | May 9, 2022 |
| 4 | Insider transaction | Mar 16, 2022 | Mar 15, 2022 |
| 4 | Insider transaction | Mar 16, 2022 | Mar 14, 2022 |
| 4 | Insider transaction | Mar 16, 2022 | Mar 15, 2022 |
| 4 | Insider transaction | Mar 16, 2022 | Mar 14, 2022 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2022 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2022 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2022 | — |
| 5 | Annual insider ownership | Feb 10, 2022 | Dec 31, 2021 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 9, 2022 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 9, 2022 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 28, 2022 | — |
| 4 | Insider transaction | Jan 12, 2022 | Jan 10, 2022 |
| 4 | Insider transaction | Jan 12, 2022 | Jan 10, 2022 |
| SC 13G | Ownership over 5% (passive) | Sep 10, 2021 | — |
| 4 | Insider transaction | Sep 2, 2021 | Aug 31, 2021 |
| 4 | Insider transaction | Sep 2, 2021 | Aug 31, 2021 |
| SC 13D | Ownership over 5% (active) | Jun 21, 2021 | — |
| SC 13D | Ownership over 5% (active) | Jun 21, 2021 | — |
| 4 | Insider transaction | Jun 15, 2021 | Jun 10, 2021 |
| 4 | Insider transaction | Jun 14, 2021 | Jun 10, 2021 |
Showing 200 filings, the most recent 200. Main filings leave out insider and ownership forms such as Form 4; choose a type above to see them. Each form opens on SEC.gov. Older filings are on SEC EDGAR.
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Company profile
- Industry
- Measuring & Controlling Devices, NEC (SIC 3829)
- Listed as
- QSI (Nasdaq)
- Fiscal year ends
- December 31
- Incorporated in
- DE
- Headquarters
- Branford, CT
- SEC filer status
- Non-accelerated filer, Smaller reporting company
- SEC CIK
- 1816431
- Former names
- HighCape Capital Acquisition Corp. (until Jun 10, 2021)
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Source: SEC EDGAR filings. This is company-reported data, not investment advice.