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 |
| 10-Q | Quarterly report | Aug 13, 2026 | Jun 30, 2026 |
| 8-K |
Current report
Results of operations
|
Aug 13, 2026 | Aug 13, 2026 |
| 8-K |
Current report
Listing notice
|
Jul 24, 2026 | Jul 23, 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 | — |
| 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 |
| 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 |
| 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 |
| 8-K |
Current report
Regulation FD disclosure
|
Dec 29, 2025 | Dec 29, 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 |
| 424B3 | Prospectus | Oct 29, 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 |
| 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 |
| 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 | — |
| SD | Specialized disclosure (conflict minerals) | May 22, 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 |
| 8-K |
Current report
Regulation FD disclosure
|
Apr 10, 2025 | Apr 10, 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 |
| 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 |
| 8-K |
Current report
Material agreement
|
Jan 6, 2025 | Jan 3, 2025 |
| 424B5 | Prospectus supplement | Jan 6, 2025 | — |
| 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 |
| 8-K |
Current report
Officer or director change
|
Aug 27, 2024 | Aug 21, 2024 |
| 8-K |
Current report
Regulation FD disclosure
|
Aug 13, 2024 | Aug 12, 2024 |
| 10-Q | Quarterly report | Aug 7, 2024 | Jun 30, 2024 |
| 8-K |
Current report
Results of operations
|
Aug 7, 2024 | Aug 7, 2024 |
| 8-K |
Current report
Regulation FD disclosure
|
Jun 25, 2024 | Jun 25, 2024 |
| 8-K |
Current report
Auditor change
|
Jun 7, 2024 | Jun 4, 2024 |
| 8-K |
Current report
Officer or director change
|
May 30, 2024 | May 27, 2024 |
| 8-K |
Current report
Other events
|
May 24, 2024 | May 24, 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 |
| 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 |
| 8-K |
Current report
Officer or director change
|
Mar 11, 2024 | Mar 8, 2024 |
| S-8 | Employee stock plan registration | Feb 29, 2024 | — |
| 10-K | Annual report | Feb 29, 2024 | Dec 31, 2023 |
| 8-K |
Current report
Results of operations
|
Feb 29, 2024 | Feb 29, 2024 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Feb 5, 2024 | Feb 5, 2024 |
| 10-Q | Quarterly report | Nov 9, 2023 | Sep 30, 2023 |
| 8-K |
Current report
Results of operations
|
Nov 9, 2023 | Nov 9, 2023 |
| 8-K |
Current report
Officer or director change
|
Sep 21, 2023 | Sep 15, 2023 |
| 8-K |
Current report
Officer or director change
|
Sep 5, 2023 | Sep 1, 2023 |
| 8-K |
Current report
Exit or restructuring costs, Officer or director change
|
Aug 29, 2023 | Aug 26, 2023 |
| EFFECT | Filing | Aug 22, 2023 | — |
| CORRESP | Letter to the SEC | Aug 18, 2023 | — |
| UPLOAD | Letter from the SEC | Aug 18, 2023 | — |
| S-3 | Shelf registration | Aug 11, 2023 | — |
| 10-Q | Quarterly report | Aug 7, 2023 | Jun 30, 2023 |
| 8-K |
Current report
Results of operations
|
Aug 7, 2023 | Aug 7, 2023 |
| S-8 | Employee stock plan registration | Jul 20, 2023 | — |
| 8-K |
Current report
Officer or director change
|
Jul 20, 2023 | Jul 18, 2023 |
| 8-K |
Current report
Officer or director change
|
Jun 21, 2023 | Jun 16, 2023 |
| 8-K |
Current report
Officer or director change
|
Jun 7, 2023 | Jun 1, 2023 |
| 8-K |
Current report
Officer or director change
|
May 22, 2023 | May 16, 2023 |
| 8-K |
Current report
Bylaw or fiscal year change, Shareholder vote results
|
May 16, 2023 | May 11, 2023 |
| 10-Q | Quarterly report | May 11, 2023 | Mar 31, 2023 |
| 8-K |
Current report
Results of operations
|
May 11, 2023 | May 11, 2023 |
| 8-K |
Current report
Officer or director change
|
May 2, 2023 | Apr 27, 2023 |
| ARS | Annual report to shareholders | Apr 28, 2023 | Dec 31, 2022 |
| DEFA14A | Additional proxy material | Mar 29, 2023 | — |
| DEF 14A | Proxy statement | Mar 29, 2023 | May 11, 2023 |
| PRE 14A | Preliminary proxy statement | Mar 17, 2023 | May 11, 2023 |
| S-8 | Employee stock plan registration | Mar 17, 2023 | — |
| 10-K | Annual report | Mar 17, 2023 | Dec 31, 2022 |
| 8-K |
Current report
Other events
|
Mar 15, 2023 | Mar 14, 2023 |
| 8-K |
Current report
Regulation FD disclosure
|
Mar 13, 2023 | Mar 10, 2023 |
| 8-K |
Current report
Results of operations
|
Mar 6, 2023 | Mar 6, 2023 |
| 8-K |
Current report
Other events
|
Mar 2, 2023 | Feb 28, 2023 |
| 8-K |
Current report
Exit or restructuring costs
|
Jan 30, 2023 | Jan 30, 2023 |
| 8-K |
Current report
Regulation FD disclosure
|
Jan 12, 2023 | Jan 12, 2023 |
| 8-K |
Current report
Regulation FD disclosure
|
Jan 9, 2023 | Jan 9, 2023 |
| 8-K |
Current report
Other events
|
Dec 20, 2022 | Dec 20, 2022 |
| S-8 | Employee stock plan registration | Nov 10, 2022 | — |
| 10-Q | Quarterly report | Nov 8, 2022 | Sep 30, 2022 |
| 8-K |
Current report
Results of operations
|
Nov 7, 2022 | Nov 7, 2022 |
| 8-K |
Current report
Officer or director change
|
Oct 4, 2022 | Oct 2, 2022 |
| 10-Q | Quarterly report | Aug 8, 2022 | Jun 30, 2022 |
| 8-K |
Current report
Results of operations
|
Aug 8, 2022 | Aug 8, 2022 |
| 424B3 | Prospectus | Jul 20, 2022 | — |
| 424B3 | Prospectus | Jul 20, 2022 | — |
| EFFECT | Filing | Jul 18, 2022 | — |
| POS462B | Filing | Jul 15, 2022 | — |
| POS AM | Filing | Jul 15, 2022 | — |
| 424B3 | Prospectus | Jun 16, 2022 | — |
| 424B3 | Prospectus | Jun 16, 2022 | — |
| 8-K |
Current report
Officer or director change
|
Jun 16, 2022 | Jun 10, 2022 |
| 424B3 | Prospectus | Jun 10, 2022 | — |
| 424B3 | Prospectus | Jun 10, 2022 | — |
| 8-K |
Current report
Officer or director change
|
Jun 10, 2022 | Jun 9, 2022 |
| 424B3 | Prospectus | May 16, 2022 | — |
| 424B3 | Prospectus | May 16, 2022 | — |
| 8-K |
Current report
Shareholder vote results
|
May 16, 2022 | May 10, 2022 |
| 424B3 | Prospectus | May 10, 2022 | — |
| 424B3 | Prospectus | May 10, 2022 | — |
| 10-Q | Quarterly report | May 10, 2022 | Mar 31, 2022 |
| 424B3 | Prospectus | May 9, 2022 | — |
| 424B3 | Prospectus | May 9, 2022 | — |
| 8-K |
Current report
Results of operations, Officer or director change
|
May 9, 2022 | May 5, 2022 |
| DEFA14A | Additional proxy material | Mar 29, 2022 | — |
| DEF 14A | Proxy statement | Mar 29, 2022 | May 10, 2022 |
| 424B3 | Prospectus | Mar 14, 2022 | — |
| S-1MEF | Filing | Mar 11, 2022 | — |
| 8-K |
Current report
Regulation FD disclosure
|
Mar 8, 2022 | Mar 8, 2022 |
| 424B3 | Prospectus | Mar 4, 2022 | — |
| EFFECT | Filing | Mar 3, 2022 | — |
| POS AM | Filing | Mar 2, 2022 | — |
| S-8 | Employee stock plan registration | Mar 1, 2022 | — |
| 10-K | Annual report | Mar 1, 2022 | Dec 31, 2021 |
| 8-K |
Current report
Results of operations
|
Feb 28, 2022 | Feb 28, 2022 |
| 8-K |
Current report
Officer or director change
|
Feb 14, 2022 | Feb 8, 2022 |
| 8-K |
Current report
Regulation FD disclosure
|
Jan 12, 2022 | Jan 12, 2022 |
| 8-K |
Current report
Regulation FD disclosure
|
Jan 10, 2022 | Jan 10, 2022 |
| 424B3 | Prospectus | Jan 4, 2022 | — |
| 8-K |
Current report
Material agreement, New debt, Regulation FD disclosure
|
Jan 4, 2022 | Dec 28, 2021 |
| 424B3 | Prospectus | Nov 19, 2021 | — |
| 424B3 | Prospectus | Nov 15, 2021 | — |
| 10-Q | Quarterly report | Nov 15, 2021 | Sep 30, 2021 |
| 8-K |
Current report
Results of operations
|
Nov 10, 2021 | Nov 10, 2021 |
| 8-K |
Current report
Regulation FD disclosure
|
Oct 19, 2021 | Oct 19, 2021 |
| 8-K |
Current report
Regulation FD disclosure
|
Sep 29, 2021 | Sep 29, 2021 |
| 424B3 | Prospectus | Sep 24, 2021 | — |
| 8-K |
Current report
Material agreement
|
Sep 24, 2021 | Sep 20, 2021 |
| S-8 | Employee stock plan registration | Sep 2, 2021 | — |
| 424B3 | Prospectus | Aug 16, 2021 | — |
| 10-Q | Quarterly report | Aug 16, 2021 | Jun 30, 2021 |
| 8-K |
Current report
Results of operations
|
Aug 16, 2021 | Aug 16, 2021 |
| 424B3 | Prospectus | Jul 22, 2021 | — |
| EFFECT | Filing | Jul 21, 2021 | — |
| CORRESP | Letter to the SEC | Jul 19, 2021 | — |
| S-1/A | Amended registration statement | Jul 19, 2021 | — |
| UPLOAD | Letter from the SEC | Jul 8, 2021 | — |
| 8-K |
Current report
Officer or director change
|
Jul 6, 2021 | Jun 29, 2021 |
| S-1 | Registration statement | Jul 2, 2021 | — |
| 8-K |
Current report
Officer or director change
|
Jun 25, 2021 | Jun 24, 2021 |
| 8-K |
Current report
Material agreement, New debt, Regulation FD disclosure
|
Jun 24, 2021 | Jun 18, 2021 |
| 8-K/A |
Amended current report
Bylaw or fiscal year change, Regulation FD disclosure, Other events
|
Jun 16, 2021 | Jun 10, 2021 |
| 425 | Form 8-k/a | Jun 16, 2021 | — |
| 8-K |
Current report
Material agreement, Acquisition or sale of assets, Unregistered share sale, Change to shareholder rights, Auditor change, Change in control, Officer or director change
|
Jun 15, 2021 | Jun 10, 2021 |
| 8-K |
Current report
Regulation FD disclosure
|
Jun 15, 2021 | Jun 15, 2021 |
| 25-NSE | Delisting notice | Jun 10, 2021 | — |
| 10-Q/A | Amended quarterly report | Jun 10, 2021 | Mar 31, 2021 |
| 8-K |
Current report
Shareholder vote results
|
Jun 9, 2021 | Jun 9, 2021 |
| 8-K |
Current report
Other events
|
Jun 8, 2021 | Jun 7, 2021 |
| 425 | Form 8-k | Jun 8, 2021 | — |
| 425 | Filing | Jun 2, 2021 | — |
| 425 | Filing | May 27, 2021 | — |
| 10-Q | Quarterly report | May 24, 2021 | Mar 31, 2021 |
| NT 10-Q | Filing | May 18, 2021 | Mar 31, 2021 |
| 425 | Filing | May 17, 2021 | — |
| EFFECT | Filing | May 14, 2021 | — |
| 424B3 | Prospectus | May 14, 2021 | — |
| CORRESP | Letter to the SEC | May 13, 2021 | — |
| CORRESP | Letter to the SEC | May 13, 2021 | — |
| S-4/A | Filing | May 13, 2021 | — |
| UPLOAD | Letter from the SEC | May 13, 2021 | — |
| CORRESP | Letter to the SEC | May 13, 2021 | — |
| S-4/A | Filing | May 13, 2021 | — |
| UPLOAD | Letter from the SEC | May 12, 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)
Other Measuring & Controlling Devices, NEC companies
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- Rockwell Automation, Inc ROK
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- Onto Innovation Inc. ONTO
- Mirion Technologies, Inc. MIR
- Owlet, Inc. OWLT
- Geospace Technologies Corp GEOS
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Source: SEC EDGAR filings. This is company-reported data, not investment advice.