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 |
|---|---|---|---|
| 25-NSE | Delisting notice | Jun 10, 2026 | — |
| SD | Specialized disclosure (conflict minerals) | May 22, 2026 | — |
| SD | Specialized disclosure (conflict minerals) | May 22, 2025 | — |
| DEFR14A | Filing | Apr 30, 2024 | — |
| EFFECT | Filing | Aug 22, 2023 | — |
| CORRESP | Letter to the SEC | Aug 18, 2023 | — |
| UPLOAD | Letter from the SEC | Aug 18, 2023 | — |
| EFFECT | Filing | Jul 18, 2022 | — |
| POS462B | Filing | Jul 15, 2022 | — |
| EFFECT | Filing | Mar 3, 2022 | — |
| EFFECT | Filing | Jul 21, 2021 | — |
| CORRESP | Letter to the SEC | Jul 19, 2021 | — |
| UPLOAD | Letter from the SEC | Jul 8, 2021 | — |
| 425 | Form 8-k/a | Jun 16, 2021 | — |
| 25-NSE | Delisting notice | Jun 10, 2021 | — |
| 425 | Form 8-k | Jun 8, 2021 | — |
| 425 | Filing | Jun 2, 2021 | — |
| 425 | Filing | May 27, 2021 | — |
| NT 10-Q | Filing | May 18, 2021 | Mar 31, 2021 |
| 425 | Filing | May 17, 2021 | — |
| EFFECT | Filing | May 14, 2021 | — |
| CORRESP | Letter to the SEC | May 13, 2021 | — |
| CORRESP | Letter to the SEC | May 13, 2021 | — |
| UPLOAD | Letter from the SEC | May 13, 2021 | — |
| CORRESP | Letter to the SEC | May 13, 2021 | — |
| UPLOAD | Letter from the SEC | May 12, 2021 | — |
| CORRESP | Letter to the SEC | May 10, 2021 | — |
| 425 | Filing | May 6, 2021 | — |
| 425 | Filing | Apr 29, 2021 | — |
| 425 | Filing | Apr 22, 2021 | — |
| UPLOAD | Letter from the SEC | Apr 21, 2021 | — |
| CORRESP | Letter to the SEC | Apr 7, 2021 | — |
| UPLOAD | Letter from the SEC | Mar 26, 2021 | — |
| 425 | Form 8-k | Feb 23, 2021 | — |
| 425 | Form 8-k | Feb 18, 2021 | — |
| EFFECT | Filing | Sep 3, 2020 | — |
| CERT | Filing | Sep 3, 2020 | — |
| 8-A12B | Filing | Sep 2, 2020 | — |
| CORRESP | Letter to the SEC | Sep 1, 2020 | — |
| CORRESP | Letter to the SEC | Sep 1, 2020 | — |
| CORRESP | Letter to the SEC | Aug 31, 2020 | — |
| UPLOAD | Letter from the SEC | Aug 18, 2020 | — |
| DRS | Filing | Jul 2, 2020 | — |
Showing 43 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.
New to this? Read What Are SEC Filings? 10-K, 10-Q, 8-K and Other Forms Explained.
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
- Thermo Fisher Scientific Inc. TMO
- Rockwell Automation, Inc ROK
- Trimble Inc. TRMB
- Onto Innovation Inc. ONTO
- Mirion Technologies, Inc. MIR
- Owlet, Inc. OWLT
- Geospace Technologies Corp GEOS
- Birchtech Corp. BCHT
Source: SEC EDGAR filings. This is company-reported data, not investment advice.