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 |
|---|---|---|---|
| DEFA14A | Additional proxy material | Apr 1, 2026 | — |
| DEF 14A | Proxy statement | Apr 1, 2026 | Apr 1, 2026 |
| DEFA14A | Additional proxy material | Mar 20, 2025 | — |
| DEF 14A | Proxy statement | Mar 20, 2025 | May 16, 2025 |
| 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 |
| 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 |
| DEFA14A | Additional proxy material | Mar 29, 2022 | — |
| DEF 14A | Proxy statement | Mar 29, 2022 | May 10, 2022 |
Showing 12 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.