FISN
Deep Fission, Inc. Common StockNASDAQ
Industrials • Specialty Industrial Machinery
$1.85+23.33%
Close Nov 6, 2026
- Market cap
- $101.93M
- 1 month
- -60.3%
- 3 months
- -76.7%
- 1 year
- —
- Dividend
- No dividends on record
- Short interest
- 5.9% of float1.8M shares · settled Oct 15, 2026 · +12.4% since Sep 30, 2026 · FINRA
Fundamentals · trailing 12 months to Sep 30, 2026
- Revenue
- —
- Net income
- —
- Free cash flow
- —
- Book value
- $83.8M
- Total debt
- $52K
- P/E
- —
- Price / sales
- —
- Price / book
- 1.2×
- FCF yield
- —
- Net margin
- —
EODHD (TTM) · as of Nov 6, 2026
End-of-day close from stored market data, not a live quote.
About Deep Fission, Inc. Common Stock
Deep Fission, Inc. develops and deploys small modular nuclear reactors placed deep underground to generate electricity. The company provides small modular nuclear reactors designed for underground installation at a depth of one mile, offering carbon-free energy and capacity solutions.
Read more
It delivers scalable reactor configurations for onsite power needs or flexible offtake agreements in wholesale power markets, manages the licensing process with regulatory authorities, and supports strategic development for decarbonization and reliability goals. The company also provides advisory and partnership services for deployment and operation of its reactor technology, using artificial intelligence to streamline operations. Deep Fission serves utilities, data centers, heavy industry, the military, government, and large cities. The company was founded in 2023 and is based in Berkeley, California.
- Website
- deepfission.com
- Headquarters
- Berkeley, CA, United States
- Employees
- 51
- Listed
- Jun 18, 2026
- Fiscal year ends
- December
Company profile from EODHD, stored Nov 7, 2026.
Quarterly results
The last 5 fiscal quarters as reported (EODHD). Year over year compares the same quarter a year earlier.
| Quarter | Revenue | YoY | Gross margin | Op. income | Net income |
|---|---|---|---|---|---|
| Sep 2026filed Nov 4, 2026 | — | — | — | — | -$20.9M |
| Jun 2026filed Aug 3, 2026 | — | — | — | -$31.6M | -$31.0M |
| Mar 2026filed May 8, 2026 | — | — | — | -$21.8M | -$21.3M |
| Sep 2025filed Nov 14, 2025 | — | — | — | -$8.8M | -$40.4M |
| Mar 2025 | — | — | — | -$1.7M | -$3.1M |
Fiscal years · last 1
| Fiscal year | Revenue | YoY | Gross margin | Op. income | Net income |
|---|---|---|---|---|---|
| Dec 2025filed Apr 15, 2026 | — | — | — | -$21.4M | -$61.0M |
Short-interest history
FINRA reports open short positions for a settlement date. The publication date is later. These are reported positions, with a separate date for each observation.
Compare the reported short exposure around the dates you bought, sold or watched FISN. A long position benefits from price rises; a short position benefits from falls. A change in these counts does not predict either move.
Settlement Oct 15, 2026
1,786,449 shares short
+196,523 shares (+12.4%) vs Sep 30, 2026
5.9% of the stored float. Published Oct 26, 2026.
Settlement Sep 30, 2026
1,589,926 shares short
+342,833 shares (+27.5%) vs Sep 15, 2026
5% of the stored float. Published Oct 9, 2026.
Settlement Sep 15, 2026
1,247,093 shares short
+300,852 shares (+31.8%) vs Aug 31, 2026
3.9% of the stored float. Published Sep 24, 2026.
Settlement Aug 31, 2026
946,241 shares short
+69,963 shares (+8%) vs Aug 14, 2026
Share of float unavailable. Published Sep 10, 2026.
Settlement Aug 14, 2026
876,278 shares short
Earlier settlement unavailable; change not calculated.
Share of float unavailable. Published Aug 25, 2026.
Change = this settlement’s shares short − the previous recorded settlement’s shares short; percentage change divides by that earlier count. A zero earlier count has no percentage change. Split-spanning counts are left uncompared. Float percentages use the stored settlement observation, not today’s float.
Source: stored FINRA equity short-interest records, up to six settlements from the last 240 days. FINRA data and reporting dates · How to read short interest
Dividends and stock splits
See the recorded cash amounts and dates behind FISN’s income, and the splits that change its share count. Dates below are stored event records, not confirmation of a payment to your account.
Cash-dividend records
No qualified cash-dividend records are stored. This does not establish that the company pays no dividend.
Up to six Polygon cash-dividend events, including recorded ex-dates within the next 120 days. Amounts retain their recorded currency and decimal precision. Historical amounts are not restated to a common split basis, annualized, or converted to dollars.
For a long holding, compare the ex-date with when you held the shares and check the pay date against your broker’s cash history. Owning the stock today does not establish past entitlement. For a short holding, a dividend can create a payment obligation to the share lender.
Ex-dates and special dividend rules · Short-sale dividend obligations · Dividend data definitions
Split history
No qualified split events are stored. This does not establish that the stock has never split.
Up to six stored split dates through Nov 7, 2026. Equivalent vendor ratios are combined; conflicting ratios are left out. This history may be incomplete.
A split changes the share count and per-share price basis; it does not by itself add investment value. Put your holding’s earlier and later share counts on the same basis before comparing them. This applies to both long shares and shares owed on a short position.
How stock splits workPortfolio context
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Smart money context
Holder IQ: MEDIUM
5 smart-money holders: institutions with a high Holder IQ
Q2 2026, filed Sep 2, 2026
Insider context
Sentiment: unknown
No recent insider trades detected.
Read the insider context evidence
What it means for you
Sign in to read your holdings or watchlist context. No personal position or direction is inferred.
What happened
No directional recent-activity label is available. This context label is separate from the scored insider signal read.
Why it can matter
A count of reported activity describes a sample, not purchase conviction, an insider’s intent or a future price move. Neutral is not an all-clear, and absent direction is not neutral evidence.
How we got this
The current context rule reads at most 50 nonduplicate issuer/share-class records filed in the last 90 days. It counts a bullish direction or purchase code P toward bullish, and a bearish direction or sale code S toward bearish. A side must exceed the opposite count by more than two to set its label; otherwise nonzero directional counts produce neutral. Calculation unavailable for this saved label: its counts, exact records, as-of time and rule version are not supplied here. Do not substitute the separate scored read’s different window or denominator.
Where the data comes from
Stored SEC Forms 3/4/5 insider-signal records, ordered by filing date with amendment duplicates excluded. Filing date is not transaction date. The last-trade line locates recent reported activity; it does not date or reconstruct the complete count.
Red flags: 8
Read the insider context evidence
What it means for you
Sign in to read your holdings or watchlist context. No personal position or direction is inferred.
What happened
No directional recent-activity label is available. This context label is separate from the scored insider signal read.
Why it can matter
A count of reported activity describes a sample, not purchase conviction, an insider’s intent or a future price move. Neutral is not an all-clear, and absent direction is not neutral evidence.
How we got this
The current context rule reads at most 50 nonduplicate issuer/share-class records filed in the last 90 days. It counts a bullish direction or purchase code P toward bullish, and a bearish direction or sale code S toward bearish. A side must exceed the opposite count by more than two to set its label; otherwise nonzero directional counts produce neutral. Calculation unavailable for this saved label: its counts, exact records, as-of time and rule version are not supplied here. Do not substitute the separate scored read’s different window or denominator.
Where the data comes from
Stored SEC Forms 3/4/5 insider-signal records, ordered by filing date with amendment duplicates excluded. Filing date is not transaction date. The last-trade line locates recent reported activity; it does not date or reconstruct the complete count.
Largest 13-F holders · Q2 2026
22 filers reported a long position in FISN for Q2 2026. 13-F holdings are filed up to 45 days after the quarter ends.
The top 10 hold
97.3%
of the 2.3M shares 13-F filers reported
Moves vs Q1 2026
No comparable changes
10 new
| Rank | Holder | Value | Shares | Shares vs Q1 2026 |
|---|---|---|---|---|
| 1 | Blue Owl Capital Holdings LP | $14.7M · 1.3M shares | 1.3M | New |
| 2 | Elevation Wealth Management LLC | $3.3M · 298.3K shares | 298.3K | New |
| 3 | UBS Group AG | $2.2M · 198.5K shares | 198.5K | New |
| 4 | CONSOLIDATED PRESS INTERNATIONAL HOLDINGS LTD | $1.5M · 133.3K shares | 133.3K | New |
| 5 | CITADEL ADVISORS LLC | $1.2M · 110K shares | 110K | New |
| 6 | LPL Financial LLC | $782.3K · 70.9K shares | 70.9K | New |
| 7 | GEODE CAPITAL MANAGEMENT, LLC | $301.8K · 27.3K shares | 27.3K | New |
| 8 | Essential Investment Partners LLC | $291.5K · 26.4K shares | 26.4K | New |
| 9 | CHAPIN DAVIS, INC. | $209.8K · 19K shares | 19K | New |
| 10 | GOLDMAN SACHS GROUP INC | $191.8K · 17.4K shares | 17.4K | New |
Sign in to see each holder’s Holder IQ, factor-adjusted Holder IQ and rank, and compare these holders with all scored filers. Available on every plan.
Sign in5% holder filings (13D / 13G)
Holders of more than 5% of FISN file with the SEC within days. A 13D holder may seek to influence the company; a 13G holder is passive. Each holder’s latest filing from the last three years.
| Filed | Holder | % of class |
|---|---|---|
| May 15, 2026 | Tompkins Mark N13G · passive · amended | 5.6% |
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