# Quantum-Si Inc: filings

QSI · Nasdaq · CIK 1816431 · [Technology](/sectors/technology.md) · fiscal year ends Dec 31

Pages: [Overview](/companies/qsi.md) · [Financials](/companies/qsi/financials.md) · [Filings](/companies/qsi/filings.md) · [Insiders](/companies/qsi/insiders.md)

## Reports and events: 144 filings

Newest first, by EDGAR acceptance time (Eastern). Filter with ?form= one of: `periodic`, `8-K`, `10-K`, `10-Q`, `4`, `proxy`, `13dg`, `all`, or any form this company filed (4 136, 8-K 93, 3 30, 144 28, 424B3 22, 10-Q 18, SC 13G/A 14, 425 10, CORRESP 10, SC 13G 9, S-8 8, SCHEDULE 13G/A 7, UPLOAD 7, 10-K 6, EFFECT 6, DEF 14A 5, DEFA14A 5, SC 13D/A 5, 424B5 4, ARS 4, S-4/A 4, SC 13D 4, 8-K/A 3, S-1/A 3, SCHEDULE 13D/A 3, 25-NSE 2, POS AM 2, PRE 14A 2, S-1 2, S-3 2, SD 2, 10-K/A 1, 10-Q/A 1, 424B4 1, 5 1, 8-A12B 1, CERT 1, DEFR14A 1, DRS 1, NT 10-Q 1, POS462B 1, S-1MEF 1, S-3/A 1, S-4 1, SCHEDULE 13G 1).

| Filed | Accepted | Form | What it is | Accession |
| --- | --- | --- | --- | --- |
| 2026-10-15 | 13:15 ET | [8-K](/filings/0001816431-26-000068.md) | 8.01 Other events; 9.01 Financial statements and exhibits | 0001816431-26-000068 |
| 2026-10-08 | 20:12 ET | [8-K](/filings/0001816431-26-000064.md) | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001816431-26-000064 |
| 2026-09-29 | 00:29 ET | [8-K](/filings/0001816431-26-000061.md) | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001816431-26-000061 |
| 2026-08-28 | 21:35 ET | [SCHEDULE 13D/A](/filings/0001140361-26-034869.md) | Ownership report, active investor, amended | 0001140361-26-034869 |
| 2026-08-13 | 20:55 ET | [10-Q](/filings/0001816431-26-000056.md) | Quarterly report, period 2026-06-30 | 0001816431-26-000056 |
| 2026-08-13 | 20:11 ET | [8-K](/filings/0001816431-26-000053.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001816431-26-000053 |
| 2026-07-24 | 21:21 ET | [8-K](/filings/0001816431-26-000049.md) | 3.01 Delisting notice | 0001816431-26-000049 |
| 2026-06-24 | 20:06 ET | [8-K](/filings/0001816431-26-000046.md) | 1.01 Entry into a material agreement; 2.03 New direct financial obligation; 9.01 Financial statements and exhibits | 0001816431-26-000046 |
| 2026-05-15 | 20:14 ET | [8-K](/filings/0001816431-26-000037.md) | 5.07 Shareholder vote results | 0001816431-26-000037 |
| 2026-05-07 | 20:47 ET | [10-Q](/filings/0001816431-26-000034.md) | Quarterly report, period 2026-03-31 | 0001816431-26-000034 |
| 2026-05-07 | 20:13 ET | [8-K](/filings/0001816431-26-000032.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001816431-26-000032 |
| 2026-04-01 | 20:06 ET | [DEF 14A](/filings/0001816431-26-000021.md) | Proxy statement, period 2026-04-01 | 0001816431-26-000021 |
| 2026-03-03 | 21:34 ET | [10-K](/filings/0001816431-26-000011.md) | Annual report, period 2025-12-31 | 0001816431-26-000011 |
| 2026-03-03 | 21:08 ET | [8-K](/filings/0001816431-26-000009.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001816431-26-000009 |
| 2025-12-29 | 21:16 ET | [8-K](/filings/0001816431-25-000074.md) | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001816431-25-000074 |
| 2025-11-20 | 13:06 ET | [8-K](/filings/0001816431-25-000071.md) | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001816431-25-000071 |
| 2025-11-05 | 22:07 ET | [10-Q](/filings/0001816431-25-000066.md) | Quarterly report, period 2025-09-30 | 0001816431-25-000066 |
| 2025-11-05 | 21:09 ET | [8-K](/filings/0001816431-25-000065.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001816431-25-000065 |
| 2025-09-29 | 20:07 ET | [8-K](/filings/0001140361-25-036498.md) | 1.01 Entry into a material agreement; 9.01 Financial statements and exhibits | 0001140361-25-036498 |
| 2025-09-26 | 20:01 ET | [8-K](/filings/0001816431-25-000060.md) | 1.01 Entry into a material agreement; 1.02 Termination of a material agreement; 2.03 New direct financial obligation; 9.01 Financial statements and exhibits | 0001816431-25-000060 |
| 2025-09-11 | 21:04 ET | [SCHEDULE 13D/A](/filings/0001140361-25-034713.md) | Ownership report, active investor, amended | 0001140361-25-034713 |
| 2025-08-08 | 20:57 ET | [8-K](/filings/0001816431-25-000056.md) | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001816431-25-000056 |
| 2025-08-05 | 20:36 ET | [10-Q](/filings/0001816431-25-000050.md) | Quarterly report, period 2025-06-30 | 0001816431-25-000050 |
| 2025-08-05 | 20:09 ET | [8-K](/filings/0001816431-25-000048.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001816431-25-000048 |
| 2025-07-07 | 21:13 ET | [8-K](/filings/0001140361-25-025059.md) | 1.01 Entry into a material agreement; 1.02 Termination of a material agreement; 8.01 Other events; 9.01 Financial statements and exhibits | 0001140361-25-025059 |
| 2025-05-19 | 20:05 ET | [8-K](/filings/0001140361-25-019766.md) | 5.07 Shareholder vote results | 0001140361-25-019766 |
| 2025-05-15 | 20:36 ET | [10-Q](/filings/0001816431-25-000040.md) | Quarterly report, period 2025-03-31 | 0001816431-25-000040 |
| 2025-05-15 | 20:11 ET | [8-K](/filings/0001816431-25-000038.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001816431-25-000038 |
| 2025-04-10 | 20:49 ET | [8-K](/filings/0001816431-25-000032.md) | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001816431-25-000032 |
| 2025-03-20 | 20:07 ET | [DEF 14A](/filings/0001816431-25-000024.md) | Proxy statement, period 2025-05-16 | 0001816431-25-000024 |
| 2025-03-03 | 21:19 ET | [10-K](/filings/0001816431-25-000014.md) | Annual report, period 2024-12-31 | 0001816431-25-000014 |
| 2025-03-03 | 21:08 ET | [8-K](/filings/0001816431-25-000011.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001816431-25-000011 |
| 2025-01-06 | 12:08 ET | [8-K](/filings/0001140361-25-000295.md) | 1.01 Entry into a material agreement; 9.01 Financial statements and exhibits | 0001140361-25-000295 |
| 2024-12-31 | 01:30 ET | [SCHEDULE 13D/A](/filings/0001140361-24-050720.md) | Ownership report, active investor, amended | 0001140361-24-050720 |
| 2024-12-11 | 13:58 ET | [8-K](/filings/0001140361-24-048977.md) | 1.01 Entry into a material agreement; 1.02 Termination of a material agreement; 9.01 Financial statements and exhibits | 0001140361-24-048977 |
| 2024-12-09 | 11:05 ET | [8-K](/filings/0001140361-24-048732.md) | 8.01 Other events; 9.01 Financial statements and exhibits | 0001140361-24-048732 |
| 2024-11-22 | 21:06 ET | [8-K](/filings/0001140361-24-047639.md) | 2.05 Exit or disposal costs | 0001140361-24-047639 |
| 2024-11-21 | 00:30 ET | [8-K](/filings/0001140361-24-047429.md) | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001140361-24-047429 |
| 2024-11-12 | 21:57 ET | [10-Q](/filings/0001816431-24-000020.md) | Quarterly report, period 2024-09-30 | 0001816431-24-000020 |
| 2024-11-12 | 21:48 ET | [8-K/A](/filings/0001816431-24-000018.md) | 3.01 Delisting notice | 0001816431-24-000018 |
| 2024-11-12 | 12:38 ET | [8-K](/filings/0001816431-24-000013.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001816431-24-000013 |
| 2024-11-08 | 22:03 ET | [8-K](/filings/0001816431-24-000009.md) | 3.01 Delisting notice | 0001816431-24-000009 |
| 2024-09-17 | 20:24 ET | [SC 13D/A](/filings/0001140361-24-041311.md) | Ownership report, active investor, amended | 0001140361-24-041311 |
| 2024-08-27 | 20:38 ET | [8-K](/filings/0001140361-24-038744.md) | 5.02 Departure or appointment of officers or directors; 9.01 Financial statements and exhibits | 0001140361-24-038744 |
| 2024-08-13 | 01:44 ET | [8-K](/filings/0001140361-24-036909.md) | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001140361-24-036909 |
| 2024-08-07 | 20:12 ET | [10-Q](/filings/0001628280-24-035626.md) | Quarterly report, period 2024-06-30 | 0001628280-24-035626 |
| 2024-08-07 | 20:07 ET | [8-K](/filings/0001628280-24-035608.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001628280-24-035608 |
| 2024-06-25 | 20:05 ET | [8-K](/filings/0001140361-24-031295.md) | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001140361-24-031295 |
| 2024-06-07 | 20:06 ET | [8-K](/filings/0001140361-24-029281.md) | 4.01 Change of auditor; 9.01 Financial statements and exhibits | 0001140361-24-029281 |
| 2024-05-30 | 20:27 ET | [8-K](/filings/0001140361-24-028135.md) | 5.02 Departure or appointment of officers or directors; 9.01 Financial statements and exhibits | 0001140361-24-028135 |

Page 1 of 3. [Older](/companies/qsi/filings.md?page=2)
Source: SEC EDGAR, the company’s filing index. Last ingested by Listed: Oct 24, 2026, 15:06 ET. No prices; not investment advice.