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 |
|---|---|---|---|
| S-8 | Employee stock plan registration | Mar 3, 2026 | — |
| 424B3 | Prospectus | Oct 29, 2025 | — |
| S-3/A | Filing | Oct 9, 2025 | — |
| S-3 | Shelf registration | Sep 26, 2025 | — |
| 424B5 | Prospectus supplement | Jul 7, 2025 | — |
| 424B5 | Prospectus supplement | Jul 7, 2025 | — |
| S-8 | Employee stock plan registration | Mar 3, 2025 | — |
| 424B5 | Prospectus supplement | Jan 6, 2025 | — |
| 424B5 | Prospectus supplement | Dec 11, 2024 | — |
| S-8 | Employee stock plan registration | Feb 29, 2024 | — |
| S-3 | Shelf registration | Aug 11, 2023 | — |
| S-8 | Employee stock plan registration | Jul 20, 2023 | — |
| S-8 | Employee stock plan registration | Mar 17, 2023 | — |
| S-8 | Employee stock plan registration | Nov 10, 2022 | — |
| 424B3 | Prospectus | Jul 20, 2022 | — |
| 424B3 | Prospectus | Jul 20, 2022 | — |
| POS AM | Filing | Jul 15, 2022 | — |
| 424B3 | Prospectus | Jun 16, 2022 | — |
| 424B3 | Prospectus | Jun 16, 2022 | — |
| 424B3 | Prospectus | Jun 10, 2022 | — |
| 424B3 | Prospectus | Jun 10, 2022 | — |
| 424B3 | Prospectus | May 16, 2022 | — |
| 424B3 | Prospectus | May 16, 2022 | — |
| 424B3 | Prospectus | May 10, 2022 | — |
| 424B3 | Prospectus | May 10, 2022 | — |
| 424B3 | Prospectus | May 9, 2022 | — |
| 424B3 | Prospectus | May 9, 2022 | — |
| 424B3 | Prospectus | Mar 14, 2022 | — |
| S-1MEF | Filing | Mar 11, 2022 | — |
| 424B3 | Prospectus | Mar 4, 2022 | — |
| POS AM | Filing | Mar 2, 2022 | — |
| S-8 | Employee stock plan registration | Mar 1, 2022 | — |
| 424B3 | Prospectus | Jan 4, 2022 | — |
| 424B3 | Prospectus | Nov 19, 2021 | — |
| 424B3 | Prospectus | Nov 15, 2021 | — |
| 424B3 | Prospectus | Sep 24, 2021 | — |
| S-8 | Employee stock plan registration | Sep 2, 2021 | — |
| 424B3 | Prospectus | Aug 16, 2021 | — |
| 424B3 | Prospectus | Jul 22, 2021 | — |
| S-1/A | Amended registration statement | Jul 19, 2021 | — |
| S-1 | Registration statement | Jul 2, 2021 | — |
| 424B3 | Prospectus | May 14, 2021 | — |
| S-4/A | Filing | May 13, 2021 | — |
| S-4/A | Filing | May 13, 2021 | — |
| S-4/A | Filing | May 11, 2021 | — |
| S-4/A | Filing | Apr 7, 2021 | — |
| S-4 | Registration for a merger or exchange | Mar 1, 2021 | — |
| 424B4 | Prospectus | Sep 4, 2020 | — |
| S-1/A | Amended registration statement | Aug 31, 2020 | — |
| S-1/A | Amended registration statement | Aug 10, 2020 | — |
| S-1 | Registration statement | Aug 3, 2020 | — |
Showing 51 filings. 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.