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 |
|---|---|---|---|
| 10-Q | Quarterly report | Nov 5, 2026 | Sep 30, 2026 |
| 8-K |
Current report
Results of operations
|
Nov 5, 2026 | Nov 5, 2026 |
| 8-K |
Current report
Other events
|
Oct 15, 2026 | Oct 14, 2026 |
| 8-K |
Current report
Regulation FD disclosure
|
Oct 8, 2026 | Oct 8, 2026 |
| 8-K |
Current report
Regulation FD disclosure
|
Sep 29, 2026 | Sep 28, 2026 |
| 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 | — |
| 10-Q | Quarterly report | Aug 13, 2026 | Jun 30, 2026 |
| 8-K |
Current report
Results of operations
|
Aug 13, 2026 | Aug 13, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Jul 29, 2026 | — |
| 8-K |
Current report
Listing notice
|
Jul 24, 2026 | Jul 23, 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 | — |
| 8-K |
Current report
Material agreement, New debt
|
Jun 24, 2026 | Jun 18, 2026 |
| 25-NSE | Delisting notice | Jun 10, 2026 | — |
| SD | Specialized disclosure (conflict minerals) | May 22, 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 |
| 8-K |
Current report
Shareholder vote results
|
May 15, 2026 | May 15, 2026 |
| 10-Q | Quarterly report | May 7, 2026 | Mar 31, 2026 |
| 8-K |
Current report
Results of operations
|
May 7, 2026 | May 7, 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 | — |
| ARS | Annual report to shareholders | Apr 1, 2026 | Dec 31, 2025 |
| DEFA14A | Additional proxy material | Apr 1, 2026 | — |
| DEF 14A | Proxy statement | Apr 1, 2026 | Apr 1, 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 |
| S-8 | Employee stock plan registration | Mar 3, 2026 | — |
| 10-K | Annual report | Mar 3, 2026 | Dec 31, 2025 |
| 8-K |
Current report
Results of operations
|
Mar 3, 2026 | Mar 3, 2026 |
| 4 | Insider transaction | Feb 26, 2026 | Feb 24, 2026 |
| 8-K |
Current report
Regulation FD disclosure
|
Dec 29, 2025 | Dec 29, 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 | — |
| 4 | Insider transaction | Dec 22, 2025 | Dec 22, 2025 |
| 144 | Notice of proposed sale | Dec 22, 2025 | — |
| 8-K |
Current report
Regulation FD disclosure
|
Nov 20, 2025 | Nov 19, 2025 |
| 10-Q | Quarterly report | Nov 5, 2025 | Sep 30, 2025 |
| 8-K |
Current report
Results of operations
|
Nov 5, 2025 | Nov 5, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Oct 30, 2025 | — |
| 424B3 | Prospectus | Oct 29, 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 | — |
| S-3/A | Filing | Oct 9, 2025 | — |
| 8-K |
Current report
Material agreement
|
Sep 29, 2025 | Sep 26, 2025 |
| S-3 | Shelf registration | Sep 26, 2025 | — |
| 8-K |
Current report
Material agreement, Agreement ended, New debt
|
Sep 26, 2025 | Sep 23, 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 | — |
| 8-K |
Current report
Regulation FD disclosure
|
Aug 8, 2025 | Aug 8, 2025 |
| 10-Q | Quarterly report | Aug 5, 2025 | Jun 30, 2025 |
| 8-K |
Current report
Results of operations
|
Aug 5, 2025 | Aug 5, 2025 |
| SCHEDULE 13G | Ownership over 5% (passive) | Jul 29, 2025 | — |
| 8-K |
Current report
Material agreement, Agreement ended, Other events
|
Jul 7, 2025 | Jul 3, 2025 |
| 424B5 | Prospectus supplement | Jul 7, 2025 | — |
| 424B5 | Prospectus supplement | Jul 7, 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 | — |
| SD | Specialized disclosure (conflict minerals) | May 22, 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 |
| 8-K |
Current report
Shareholder vote results
|
May 19, 2025 | May 16, 2025 |
| 10-Q | Quarterly report | May 15, 2025 | Mar 31, 2025 |
| 8-K |
Current report
Results of operations
|
May 15, 2025 | May 15, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 14, 2025 | — |
| 8-K |
Current report
Regulation FD disclosure
|
Apr 10, 2025 | Apr 10, 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 |
| ARS | Annual report to shareholders | Mar 20, 2025 | Dec 31, 2024 |
| DEFA14A | Additional proxy material | Mar 20, 2025 | — |
| DEF 14A | Proxy statement | Mar 20, 2025 | May 16, 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 |
| S-8 | Employee stock plan registration | Mar 3, 2025 | — |
| 10-K | Annual report | Mar 3, 2025 | Dec 31, 2024 |
| 8-K |
Current report
Results of operations
|
Mar 3, 2025 | Mar 3, 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 | — |
| 8-K |
Current report
Material agreement
|
Jan 6, 2025 | Jan 3, 2025 |
| 424B5 | Prospectus supplement | Jan 6, 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 |
| 8-K |
Current report
Material agreement, Agreement ended
|
Dec 11, 2024 | Dec 11, 2024 |
| 424B5 | Prospectus supplement | Dec 11, 2024 | — |
| 8-K |
Current report
Other events
|
Dec 9, 2024 | Dec 4, 2024 |
| 8-K |
Current report
Exit or restructuring costs
|
Nov 22, 2024 | Nov 21, 2024 |
| 8-K |
Current report
Regulation FD disclosure
|
Nov 21, 2024 | Nov 20, 2024 |
| 10-Q | Quarterly report | Nov 12, 2024 | Sep 30, 2024 |
| 8-K/A |
Amended current report
Listing notice
|
Nov 12, 2024 | Nov 4, 2024 |
| 8-K |
Current report
Results of operations
|
Nov 12, 2024 | Nov 12, 2024 |
| 8-K |
Current report
Listing notice
|
Nov 8, 2024 | Nov 4, 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 | — |
| 8-K |
Current report
Officer or director change
|
Aug 27, 2024 | Aug 21, 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 |
| 8-K |
Current report
Regulation FD disclosure
|
Aug 13, 2024 | Aug 12, 2024 |
| 3 | Initial insider ownership | Aug 12, 2024 | Aug 2, 2024 |
| 10-Q | Quarterly report | Aug 7, 2024 | Jun 30, 2024 |
| 8-K |
Current report
Results of operations
|
Aug 7, 2024 | Aug 7, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Jun 28, 2024 | — |
| 4 | Insider transaction | Jun 25, 2024 | Jun 21, 2024 |
| 8-K |
Current report
Regulation FD disclosure
|
Jun 25, 2024 | Jun 25, 2024 |
| 144 | Notice of proposed sale | Jun 21, 2024 | — |
| 4 | Insider transaction | Jun 7, 2024 | Jun 7, 2024 |
| 8-K |
Current report
Auditor change
|
Jun 7, 2024 | Jun 4, 2024 |
| 4 | Insider transaction | May 30, 2024 | May 28, 2024 |
| 3 | Initial insider ownership | May 30, 2024 | May 27, 2024 |
| 8-K |
Current report
Officer or director change
|
May 30, 2024 | May 27, 2024 |
| 144 | Notice of proposed sale | May 24, 2024 | — |
| 8-K |
Current report
Other events
|
May 24, 2024 | 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 |
| 8-K |
Current report
Bylaw or fiscal year change, Shareholder vote results
|
May 17, 2024 | May 15, 2024 |
| 10-Q | Quarterly report | May 9, 2024 | Mar 31, 2024 |
| 8-K |
Current report
Results of operations
|
May 9, 2024 | May 9, 2024 |
| DEFR14A | Filing | Apr 30, 2024 | — |
| 8-K |
Current report
Regulation FD disclosure
|
Apr 9, 2024 | Apr 9, 2024 |
| ARS | Annual report to shareholders | Apr 1, 2024 | Dec 31, 2023 |
| DEFA14A | Additional proxy material | Apr 1, 2024 | — |
| DEF 14A | Proxy statement | Apr 1, 2024 | May 15, 2024 |
| 4 | Insider transaction | Mar 25, 2024 | Mar 22, 2024 |
| 3 | Initial insider ownership | Mar 25, 2024 | Mar 21, 2024 |
| PRE 14A | Preliminary proxy statement | Mar 22, 2024 | May 15, 2024 |
| 8-K |
Current report
Officer or director change
|
Mar 21, 2024 | Mar 20, 2024 |
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.