Deep Fission, Inc. (FISN)
It posted a net loss of $81.9M. In fiscal 2025 capital spending exceeded operating cash flow by $13.1M. At September 30, 2026 it held $63.4M in cash. Its latest periodic report to the SEC is the quarterly report (10-Q) filed on November 4, 2026.
Key facts about Deep Fission, Inc.
- Net worth
- Deep Fission, Inc. has a market value (market cap) of $166.7M at the latest share price, and shareholders' equity of $83.8M on its balance sheet at September 30, 2026. A company's "net worth" usually means one of these: what the market pays for all its shares, or its assets minus its liabilities.
- Cash flow
- In fiscal 2025 operations used $13.1M of cash.
- Latest report
- The latest periodic report (quarterly report, 10-Q) was filed with the SEC on November 4, 2026 and covers the period to September 30, 2026. Open on SEC EDGAR
- Next earnings report
- Deep Fission, Inc.'s next report is expected around April 14, 2027. That is an estimate from its filing rhythm, not a date the company has announced.
What Deep Fission, Inc. does
Deep Fission, Inc. is registered with the SEC under industry code SIC 4911 (Electric Services). Its shares trade on NASDAQ under the ticker FISN.
Revenue and profit by year
Key figures
| Fiscal year | Revenue | Net income | Diluted EPS | Free cash flow |
|---|---|---|---|---|
| 2025 | n/a | -$61M | -$2.41 | -$13.1M |
| 2024 | n/a | -$5.7M | -$0.57 | -$2.8M |
| 2023 | n/a | -$47.6K | -$0.57 | n/a |
| 2022 | n/a | -$49.4K | -$0.57 | n/a |
Earnings: every quarter and the next report date
Full financial statements: income, balance sheet and cash flow
Latest SEC filings
What Deep Fission, Inc. has filed recently, newest first. Each links to the original document on SEC EDGAR.
- November 4, 2026
- November 4, 2026
- October 20, 2026
- September 21, 2026
- August 3, 2026
- July 29, 2026Other event 8-K
- July 20, 2026
- July 17, 2026
- June 22, 2026Other event 8-K
- June 17, 2026Proxy statement DEF 14A
Insider trades
What the people running Deep Fission, Inc. did with its shares, from the Form 4 filings they must send the SEC within two business days.
No insider trades were reported in the last 90 days.
| Date | Insider | What | Shares | Value |
|---|---|---|---|---|
| December 9, 2025 | Muller ElizabethChief Executive Officer | Received as pay | 549,451 | - |
Who owns FISN
Three views from three kinds of SEC filings, each with its own date. They overlap and are not added up.
5% holders
| Holder | Of class | Filed |
|---|---|---|
| Muller Elizabeth13D, may seek influence | 20.6% | September 23, 2025 |
| Muller Richard13D, may seek influence | 10.6% | September 23, 2025 |
| Mark N.Tompkins13G, passive | 5.6% | May 15, 2026 |
| EE Holdings Limited13G, passive with 1 related filers | 5.5% | November 3, 2025 |
Largest institutional holders
Positions that investment managers reported on Form 13F for the quarter ended June 30, 2026, largest first, with the change on the quarter ended March 31, 2026. Managers file 13F up to 45 days after a quarter ends. 22 managers reported a position.
| Holder | Shares | Change on quarter |
|---|---|---|
| Blue Owl Capital Holdings LP | 1,333,333 | new |
| Elevation Wealth Management LLC | 298,335 | new |
| UBS Group AG | 198,497 | new |
| Consolidated Press International Holdings Ltd | 133,333 | new |
| Citadel Advisors LLC | 110,000 | new |
| LPL Financial LLC | 70,858 | new |
| Geode Capital Management, LLC | 27,333 | new |
| Essential Investment Partners LLC | 26,400 | new |
| Chapin Davis, Inc. | 19,000 | new |
| Goldman Sachs Group Inc | 17,373 | new |
| BHK Investment Advisors, LLC | 15,000 | new |
| Prelude Capital Management, LLC | 14,714 | new |
| Traphagen Investment Advisors LLC | 13,666 | new |
| Integrated Wealth Concepts LLC | 9,600 | new |
| Morgan Stanley | 6,050 | new |
| US Bancorp | 1,100 | new |
| Clearstead Advisors, LLC | 500 | new |
| Wells Fargo & Company | 335 | new |
| Jones Financial Companies Lllp | 300 | new |
| National Bank of Canada | 200 | new |
Insiders
1 insiders reported holding 549,451 shares in total, about $1.6M at the last price.
| Holder | Shares |
|---|---|
| Muller ElizabethChief Executive Officer | 549,451 |
Questions about FISN
What does Deep Fission, Inc. do?
Deep Fission, Inc. is a company in the Utilities sector, listed on NASDAQ as FISN. Its shares trade on NASDAQ under the ticker FISN.
What is Deep Fission, Inc.'s net worth?
Deep Fission, Inc. has a market value (market cap) of $166.7M at the latest share price, and shareholders' equity of $83.8M on its balance sheet at September 30, 2026. A company's "net worth" usually means one of these: what the market pays for all its shares, or its assets minus its liabilities.
Is Deep Fission, Inc. profitable?
No. Over the twelve months to September 30, 2026 it reported a net loss of $81.9M.
When did Deep Fission, Inc. last report?
Its most recent periodic report is the quarterly report (10-Q) filed on November 4, 2026. It covers the period to September 30, 2026.
When is Deep Fission, Inc.'s next earnings report?
Deep Fission, Inc.'s next report is expected around April 14, 2027. That is an estimate from its filing rhythm, not a date the company has announced.
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Where the numbers come from
Financial figures are the values Deep Fission, Inc. tagged in its own SEC filings (XBRL), taken from the latest filing for each period, so restatements replace older figures. Revenue, profit and cash flow are for full fiscal years unless marked as the last twelve months, which is the sum of the four most recent quarters. Where a company reports only the full year, the fourth quarter is the year minus the first three.
Prices are delayed end-of-day market data in the listing currency, and market cap moves with the price. P/E is shown only when earnings per share are positive. Nothing here is investment advice.