# Deep Fission, Inc.: filings

FISN · Nasdaq · CIK 1918102 · [Utilities](/sectors/utilities.md) · fiscal year ends Dec 31

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

## Reports and events: 49 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 31, 8-K 19, 10-Q 14, 3 12, S-1/A 6, 10-K 4, EFFECT 4, 424B3 3, D 3, S-1 3, SC 13G 2, SCHEDULE 13D 2, SCHEDULE 13G/A 2, 10-12G 1, 3/A 1, 424B4 1, 424B5 1, 8-A12B 1, CERT 1, CORRESP 1, DEF 14A 1, DRS 1, NT 10-K 1, POS AM 1, S-8 1, SC 14F1 1, SCHEDULE 13G 1, SEC STAFF ACTION 1, UPLOAD 1).

| Filed | Accepted | Form | What it is | Accession |
| --- | --- | --- | --- | --- |
| 2026-10-20 | 19:54 ET | [8-K](/filings/0001104659-26-117389.md) | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001104659-26-117389 |
| 2026-09-21 | 15:26 ET | [8-K](/filings/0001104659-26-109201.md) | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001104659-26-109201 |
| 2026-08-03 | 21:25 ET | [10-Q](/filings/0001104659-26-089884.md) | Quarterly report, period 2026-06-30 | 0001104659-26-089884 |
| 2026-07-29 | 20:02 ET | [8-K](/filings/0001104659-26-088125.md) | 8.01 Other events; 9.01 Financial statements and exhibits | 0001104659-26-088125 |
| 2026-07-17 | 20:06 ET | [8-K](/filings/0001104659-26-084625.md) | 5.02 Departure or appointment of officers or directors; 5.07 Shareholder vote results; 9.01 Financial statements and exhibits | 0001104659-26-084625 |
| 2026-06-22 | 20:20 ET | [8-K](/filings/0001104659-26-076400.md) | 8.01 Other events | 0001104659-26-076400 |
| 2026-06-17 | 20:46 ET | [DEF 14A](/filings/0001104659-26-075196.md) | Proxy statement, period 2026-07-17 | 0001104659-26-075196 |
| 2026-06-10 | 19:07 ET | [S-1/A](/filings/0001104659-26-072286.md) | Registration statement, amended | 0001104659-26-072286 |
| 2026-05-20 | 10:08 ET | [S-1](/filings/0001104659-26-064074.md) | Registration statement | 0001104659-26-064074 |
| 2026-05-08 | 19:09 ET | [10-Q](/filings/0001104659-26-057835.md) | Quarterly report, period 2026-03-31 | 0001104659-26-057835 |
| 2026-04-22 | 14:11 ET | [8-K](/filings/0001104659-26-046488.md) | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001104659-26-046488 |
| 2026-04-21 | 19:50 ET | [S-1/A](/filings/0001104659-26-045974.md) | Registration statement, amended | 0001104659-26-045974 |
| 2026-04-15 | 21:28 ET | [10-K](/filings/0001104659-26-043870.md) | Annual report, period 2025-12-31 | 0001104659-26-043870 |
| 2026-04-09 | 14:46 ET | [8-K](/filings/0001104659-26-041290.md) | 4.02 Non-reliance on financial statements | 0001104659-26-041290 |
| 2026-03-05 | 14:05 ET | [8-K](/filings/0001104659-26-023876.md) | 4.01 Change of auditor; 9.01 Financial statements and exhibits | 0001104659-26-023876 |
| 2026-02-25 | 02:13 ET | [8-K](/filings/0001104659-26-019327.md) | 5.02 Departure or appointment of officers or directors | 0001104659-26-019327 |
| 2026-02-17 | 19:38 ET | [S-1](/filings/0001104659-26-016226.md) | Registration statement | 0001104659-26-016226 |
| 2026-02-10 | 12:30 ET | [8-K](/filings/0001104659-26-012343.md) | 1.01 Entry into a material agreement; 3.02 Unregistered sale of equity; 7.01 Regulation FD disclosure; 8.01 Other events; 9.01 Financial statements and exhibits | 0001104659-26-012343 |
| 2026-01-27 | 02:03 ET | [S-1/A](/filings/0001104659-26-006743.md) | Registration statement, amended | 0001104659-26-006743 |
| 2025-12-30 | 19:05 ET | [S-1/A](/filings/0001104659-25-125146.md) | Registration statement, amended | 0001104659-25-125146 |
| 2025-12-22 | 22:27 ET | [8-K](/filings/0001104659-25-123840.md) | 5.02 Departure or appointment of officers or directors; 8.01 Other events; 9.01 Financial statements and exhibits | 0001104659-25-123840 |
| 2025-12-11 | 00:24 ET | [8-K](/filings/0001104659-25-120071.md) | 5.02 Departure or appointment of officers or directors; 9.01 Financial statements and exhibits | 0001104659-25-120071 |
| 2025-12-04 | 18:42 ET | [8-K](/filings/0001104659-25-118387.md) | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001104659-25-118387 |
| 2025-12-01 | 22:10 ET | [S-1/A](/filings/0001104659-25-117373.md) | Registration statement, amended | 0001104659-25-117373 |
| 2025-11-21 | 20:16 ET | [8-K](/filings/0001104659-25-114959.md) | 1.01 Entry into a material agreement; 9.01 Financial statements and exhibits | 0001104659-25-114959 |
| 2025-11-14 | 22:17 ET | [10-Q](/filings/0001104659-25-112717.md) | Quarterly report, period 2025-09-30 | 0001104659-25-112717 |
| 2025-11-12 | 20:59 ET | [8-K](/filings/0001104659-25-110309.md) | 5.02 Departure or appointment of officers or directors; 9.01 Financial statements and exhibits | 0001104659-25-110309 |
| 2025-11-07 | 23:18 ET | [8-K](/filings/0001104659-25-107929.md) | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001104659-25-107929 |
| 2025-09-24 | 21:24 ET | [S-1/A](/filings/0001213900-25-091209.md) | Registration statement, amended | 0001213900-25-091209 |
| 2025-09-23 | 01:44 ET | [SCHEDULE 13D](/filings/0001213900-25-090841.md) | Ownership report, active investor | 0001213900-25-090841 |
| 2025-09-23 | 01:43 ET | [SCHEDULE 13D](/filings/0001213900-25-090840.md) | Ownership report, active investor | 0001213900-25-090840 |
| 2025-09-22 | 15:38 ET | [S-1](/filings/0001213900-25-089735.md) | Registration statement | 0001213900-25-089735 |
| 2025-09-11 | 21:22 ET | [8-K](/filings/0001213900-25-086894.md) | 1.01 Entry into a material agreement; 2.01 Completion of an acquisition or disposition; 3.02 Unregistered sale of equity; 3.03 Change to security holders’ rights; 4.01 Change of auditor; 5.01 Change in control; 5.02 Departure or appointment of officers or directors; 5.03 Amendment to articles or bylaws; 5.06 Item not in the standard list; 9.01 Financial statements and exhibits | 0001213900-25-086894 |
| 2025-08-12 | 20:12 ET | [10-Q](/filings/0001213900-25-074964.md) | Quarterly report, period 2025-06-30 | 0001213900-25-074964 |
| 2025-05-14 | 20:06 ET | [10-Q](/filings/0001213900-25-043294.md) | Quarterly report, period 2025-03-31 | 0001213900-25-043294 |
| 2025-03-28 | 16:00 ET | [10-K](/filings/0001013762-25-003765.md) | Annual report, period 2024-12-31 | 0001013762-25-003765 |
| 2024-11-06 | 21:41 ET | [10-Q](/filings/0001213900-24-095020.md) | Quarterly report, period 2024-09-30 | 0001213900-24-095020 |
| 2024-08-13 | 21:05 ET | [10-Q](/filings/0001213900-24-068372.md) | Quarterly report, period 2024-06-30 | 0001213900-24-068372 |
| 2024-05-14 | 20:24 ET | [10-Q](/filings/0001213900-24-042962.md) | Quarterly report, period 2024-03-31 | 0001213900-24-042962 |
| 2024-04-01 | 19:40 ET | [10-K](/filings/0001213900-24-028655.md) | Annual report, period 2023-12-31 | 0001213900-24-028655 |
| 2023-11-13 | 22:00 ET | [10-Q](/filings/0001213900-23-086211.md) | Quarterly report, period 2023-09-30 | 0001213900-23-086211 |
| 2023-08-10 | 20:35 ET | [10-Q](/filings/0001213900-23-065649.md) | Quarterly report, period 2023-06-30 | 0001213900-23-065649 |
| 2023-05-15 | 19:14 ET | [10-Q](/filings/0001213900-23-039646.md) | Quarterly report, period 2023-03-31 | 0001213900-23-039646 |
| 2023-03-31 | 20:46 ET | [10-K](/filings/0001213900-23-025556.md) | Annual report, period 2022-12-31 | 0001213900-23-025556 |
| 2022-11-14 | 22:49 ET | [10-Q](/filings/0001213900-22-071363.md) | Quarterly report, period 2022-09-30 | 0001213900-22-071363 |
| 2022-08-15 | 22:18 ET | [10-Q](/filings/0001213900-22-048232.md) | Quarterly report, period 2022-06-30 | 0001213900-22-048232 |
| 2022-07-28 | 17:30 ET | [8-K](/filings/0001213900-22-042318.md) | 4.01 Change of auditor | 0001213900-22-042318 |
| 2022-07-19 | 21:20 ET | [8-K](/filings/0001213900-22-040363.md) | 4.01 Change of auditor; 9.01 Financial statements and exhibits | 0001213900-22-040363 |
| 2022-05-16 | 21:22 ET | [10-Q](/filings/0001213900-22-027248.md) | Quarterly report, period 2022-03-31 | 0001213900-22-027248 |

Source: SEC EDGAR, the company’s filing index. Last ingested by Listed: Oct 24, 2026, 15:16 ET. No prices; not investment advice.