Deep Fission (FISN)


Market Price (7/30/2026): $9.67 | Market Cap: $618.2 MilSector: Industrials | Industry: Industrial Machinery & Supplies & Components

Deep Fission (FISN)


Market Price (7/30/2026): $9.67
Market Cap: $618.2 Mil
Sector: Industrials
Industry: Industrial Machinery & Supplies & Components

Investment Highlights Why It Matters Detailed financial logic regarding cash flow yields vs trend-riding momentum.

0

Cash is significant % of market cap
Net D/ENet Debt/Equity. Debt net of cash. Negative indicates net cash. Equity is taken as the Market Capitalization is -14%

Megatrend and thematic drivers
Megatrends include Datacenter Power. Themes include Mini Nuclear.

Weak multi-year price returns
2Y Excs Rtn is -47%, 3Y Excs Rtn is -72%

Key risks
FISN key risks include [1] demonstrating its unproven deep-borehole reactor technology, Show more.

0 Cash is significant % of market cap
Net D/ENet Debt/Equity. Debt net of cash. Negative indicates net cash. Equity is taken as the Market Capitalization is -14%
1 Megatrend and thematic drivers
Megatrends include Datacenter Power. Themes include Mini Nuclear.
2 Weak multi-year price returns
2Y Excs Rtn is -47%, 3Y Excs Rtn is -72%
3 Key risks
FISN key risks include [1] demonstrating its unproven deep-borehole reactor technology, Show more.

Valuation & Metrics

Price Chart

Why The Stock Moved

Qualitative Assessment

AI Analysis | Feedback

Updated on 7/27/2026

Deep Fission (FISN) stock has lost about 10% since 3/31/2026 because of the following key factors:

1. Significant decline post-Initial Public Offering (IPO) and weak investor demand. Deep Fission (FISN) commenced trading on June 18, 2026, with an IPO price of $16.00 per share. By July 27, 2026, the stock had fallen to $9.65, representing an approximate 39.69% decrease from its IPO price. The public offering completed on June 22, 2026, at $16.00 per share, was priced at the lower end of the projected range of $16.00 to $18.00, suggesting weaker-than-anticipated investor interest and leading to dilution for existing shareholders.

2. Persistent financial losses and pre-revenue status indicating substantial future capital requirements. As a pre-revenue company, Deep Fission reported a net loss of $61.0 million for fiscal year 2025, which significantly increased from a $5.7 million net loss in fiscal year 2024 (restated). The company, which is still in its development stage, does not expect to achieve commercialization for approximately three years, targeting initial commercial licensing as early as 2027. This prolonged path to profitability and commercial revenue implies continued significant cash burn, necessitating substantial additional capital beyond the $40 million raised in the IPO to sustain operations.

Show more
Updated on 7/27/2026

Deep Fission (FISN) stock has lost about 10% since 3/31/2026 because of the following key factors:

1. Significant decline post-Initial Public Offering (IPO) and weak investor demand. Deep Fission (FISN) commenced trading on June 18, 2026, with an IPO price of $16.00 per share. By July 27, 2026, the stock had fallen to $9.65, representing an approximate 39.69% decrease from its IPO price. The public offering completed on June 22, 2026, at $16.00 per share, was priced at the lower end of the projected range of $16.00 to $18.00, suggesting weaker-than-anticipated investor interest and leading to dilution for existing shareholders.

2. Persistent financial losses and pre-revenue status indicating substantial future capital requirements. As a pre-revenue company, Deep Fission reported a net loss of $61.0 million for fiscal year 2025, which significantly increased from a $5.7 million net loss in fiscal year 2024 (restated). The company, which is still in its development stage, does not expect to achieve commercialization for approximately three years, targeting initial commercial licensing as early as 2027. This prolonged path to profitability and commercial revenue implies continued significant cash burn, necessitating substantial additional capital beyond the $40 million raised in the IPO to sustain operations.

3. Material accounting errors and identified weaknesses in internal controls. Deep Fission restated previous financial statements due to identified material accounting errors related to the valuation of Simple Agreement for Future Equity (SAFE Notes) and stock-based compensation expense. Furthermore, as of fiscal Q1 2026 (the quarter ended March 31, 2026), the company identified material weaknesses in its internal control over financial reporting, which increased investor concerns regarding financial reporting accuracy and execution risks.

Show less
Holding a concentrated position? Know your true downside before the momentum shifts.
Protect Your Wealth →

Stock Movement Drivers

Fundamental Drivers

null
null

Market Drivers

3/31/2026 to 7/29/2026
ReturnCorrelation
FISN-11.8% 
Market (SPY)12.2%21.8%
Sector (XLI)9.2%-24.7%

Fundamental Drivers

null
null

Market Drivers

12/31/2025 to 7/29/2026
ReturnCorrelation
FISN-11.8% 
Market (SPY)7.3%21.8%
Sector (XLI)14.2%-24.7%

Fundamental Drivers

null
null

Market Drivers

6/30/2025 to 7/29/2026
ReturnCorrelation
FISN-11.8% 
Market (SPY)19.1%21.8%
Sector (XLI)21.0%-24.7%

Fundamental Drivers

null
null

Market Drivers

6/30/2023 to 7/29/2026
ReturnCorrelation
FISN-11.8% 
Market (SPY)70.4%21.8%
Sector (XLI)71.5%-24.7%

Return vs. Risk

Price Returns Compared

 202120222023202420252026Total [1]
Returns
FISN Return0%0%0%0%0%-10%-10%
Peers Return24%-2%10%150%127%-15%544%
S&P 500 Return27%-19%24%23%16%9%98%

Monthly Win Rates [3]
FISN Win Rate0%0%0%0%0%14% 
Peers Win Rate40%48%56%66%63%43% 
S&P 500 Win Rate75%42%67%75%67%43% 

Max Drawdowns [4]
FISN Max Drawdown0%0%0%0%0%-33% 
Peers Max Drawdown-35%-30%-35%-46%-52%-47% 
S&P 500 Max Drawdown-5%-25%-10%-8%-19%-9% 


[1] Cumulative total returns since the beginning of 2021
[2] Peers: BWXT, GEV, SMR, LEU, OKLO.
[3] Win Rate = % of calendar months in which monthly returns were positive
[4] Max drawdown represents maximum peak-to-trough decline within a year
[5] 2026 data is for the year up to 7/29/2026 (YTD)

How Low Can It Go

EventFISNS&P 500
2011 US Debt Ceiling Crisis & European Contagion
  % Loss-22.9%-17.9%
  % Gain to Breakeven29.8%21.8%
  Time to Breakeven5371 days123 days

Compare to BWXT, GEV, SMR, LEU, OKLO

In The Past

Deep Fission's stock fell -22.9% during the 2011 US Debt Ceiling Crisis & European Contagion. Such a loss loss requires a 29.8% gain to breakeven.

Preserve Wealth

Limiting losses and compounding gains is essential to preserving wealth.

Asset Allocation

Actively managed asset allocation strategies protect wealth. Learn more.

EventFISNS&P 500
2011 US Debt Ceiling Crisis & European Contagion
  % Loss-22.9%-17.9%
  % Gain to Breakeven29.8%21.8%
  Time to Breakeven5371 days123 days

Compare to BWXT, GEV, SMR, LEU, OKLO

In The Past

Deep Fission's stock fell -22.9% during the 2011 US Debt Ceiling Crisis & European Contagion. Such a loss loss requires a 29.8% gain to breakeven.

Preserve Wealth

Limiting losses and compounding gains is essential to preserving wealth.

Asset Allocation

Actively managed asset allocation strategies protect wealth. Learn more.

About Deep Fission (FISN)

Deep Fission, Inc. (FISN) is a nuclear energy technology company focused on developing its innovative "Gravity Reactor." This reactor is a small modular reactor (SMR) that uses established pressurized water reactor (PWR) technology but with a unique twist: it's designed to be emplaced approximately one mile below the Earth's surface in deep boreholes. This subsurface placement leverages natural conditions like hydrostatic pressure and surrounding geology for containment, cooling, and shielding, thereby reducing the reliance on large surface containment structures and other safety infrastructure. The goal is to achieve faster deployment, improved security, enhanced safety, and lower capital and operating costs compared to conventional nuclear plants, while also reducing exposure to environmental hazards.

Each 3x3 Gravity Reactor is designed to produce up to 15 megawatts of electric power, with the potential for multiple reactors to be grouped in clusters at a single site to achieve hundreds or thousands of MWe capacity. Deep Fission's commercialization strategy targets the surging global demand for energy, specifically highlighting "the AI-driven surge." The company is currently in the development stage, participating in the U.S. Department of Energy Reactor Pilot Program, and has already drilled its first data acquisition well. Deep Fission aims to demonstrate its system, obtain DOE authorization, and apply for commercial licensing with the U.S. Nuclear Regulatory Commission as early as the first half of 2027, anticipating revenue recognition approximately one year after construction begins.

AI Analysis | Feedback

Here are 1-3 brief analogies to describe Deep Fission:

  • Imagine NuScale Power, but for nuclear reactors designed to be buried a mile underground.

  • It's like a utility such as Constellation Energy, but focused on developing and deploying small, modular nuclear reactors deep below the earth's surface to provide power.

AI Analysis | Feedback

  • Gravity Reactor: A small modular reactor (SMR) designed for deep borehole emplacement, leveraging subsurface conditions to produce up to 15 MWe of electric power.

AI Analysis | Feedback

Deep Fission (FISN) is a nuclear energy technology company currently in the development stage. According to the provided description, the company was incorporated in July 2023, and the Gravity Reactor remains in conceptual and early engineering stages. Deep Fission has not yet constructed or operated a commercial reactor or generated revenue.

Therefore, Deep Fission currently does not have any major customers. The company aims for commercialization in the next three years.

Based on the nature of their product—small modular reactors (SMRs) designed to produce 15 megawatts of electric power output (MWe) for standalone installations or clustered sites capable of supplying hundreds to thousands of MWe—their prospective customers would be entities requiring substantial, reliable electricity generation. These would likely include:

  1. Electric utility companies
  2. Large industrial enterprises (e.g., data centers, manufacturing facilities)
  3. Government agencies or military installations

AI Analysis | Feedback

null

AI Analysis | Feedback

Liz Muller, Co-Founder & CEO, Board Chair
As Co-Founder and CEO of Deep Fission, Liz Muller leads the development and commercialization of an underground nuclear energy system. She is a serial nuclear entrepreneur with a track record of building organizations, and previously co-founded and served as CEO of Deep Isolation, a nuclear waste disposal company, where she now serves as Board Chair. Muller also co-founded Berkeley Earth, a climate science nonprofit.

William Mark Schmitz, Chief Financial Officer
William Mark Schmitz brings over 40 years of financial leadership experience across various capital-intensive industries to Deep Fission. He has served as CFO for major organizations including Goodyear, Itron, Plug Power, and Alghanim Industries, and has experience scaling companies and leading financial turnarounds. He also held leadership roles across multiple international markets.

Rich Muller, Co-Founder & CTO
Rich Muller is a co-founder and CTO of Deep Fission, and also a co-founder of Deep Isolation. He is a Professor Emeritus of Physics at the University of California, Berkeley, and a prolific inventor with over 80 issued patents. His research on deeply buried nuclear waste has earned him numerous awards, including the MacArthur “Genius” Prize.

Mike Brasel, Chief Operating Officer
Mike Brasel possesses nearly three decades of experience in the nuclear industry, having held senior roles at NuScale Power where he managed multi-billion-dollar nuclear projects and led supply chain development. His background also includes serving as Plant Manager of the La Crosse Boiling Water Reactor and as a U.S. Navy Nuclear Plant Operator.

Stacy Tarver Patterson, Chief Marketing Officer
Stacy Tarver Patterson leads narrative strategy, market positioning, and go-to-market development for advanced nuclear energy deployment at Deep Fission. She has 19 years of experience in global marketing strategy, digital product growth, and brand transformation for technology and consumer platforms.

AI Analysis | Feedback

Key Risks to Deep Fission (FISN)

  1. Technical and Operational Execution Risk: Deep Fission is in the early conceptual and engineering stages, having not yet constructed or operated a commercial reactor. The company faces significant, unproven technical and operational challenges in demonstrating its core technology, including successfully drilling commercial-scale boreholes, safely deploying a prototype reactor a mile underground, and integrating it into an energy ecosystem within an ambitious timeline.
  2. Regulatory Approval and Licensing Risk: The commercial viability of Deep Fission's Gravity Reactor is entirely contingent on obtaining authorization from the U.S. Department of Energy (DOE) and commercial licenses from the U.S. Nuclear Regulatory Commission (NRC) for its novel deep borehole small modular reactor (SMR) design. The company is targeting aggressive timelines for these approvals, with a commercial license application to the NRC in the first half of 2027 and high-volume commercial licensing as early as 2027, which presents a substantial risk given the stringent and often lengthy regulatory processes for nuclear technologies.
  3. Commercialization and Revenue Generation Risk: As a development-stage company with no commercial reactor operations or generated revenue, Deep Fission faces significant challenges in transitioning from development to commercial deployment. Even if technical and regulatory hurdles are overcome, there there is a risk in achieving high-volume commercial deployment, securing market adoption, and realizing revenue targets, particularly given the anticipated lag between the start of construction and revenue recognition.

AI Analysis | Feedback

null

AI Analysis | Feedback

null

AI Analysis | Feedback

Deep Fission (FISN) anticipates several key drivers for future revenue growth over the next 2-3 years, stemming directly from its phased commercialization strategy for the Gravity Reactor:

  1. Conversion of Pilot Reactors to Commercial Operation: Deep Fission aims to demonstrate the Gravity Reactor and apply for a commercial license with the U.S. Nuclear Regulatory Commission (NRC) in the first half of 2027, intending to convert the same pilot reactor to commercial operation. This initial commercial operation of pilot wells is expected to be the company's first source of revenue.
  2. High-Volume Commercial Licensing and Clustered Deployment at Single Sites: As part of its third deployment phase, the company targets seeking high-volume commercial licensing with the NRC as early as 2027 for the deployment of multiple reactors at a single site through clustered boreholes. This strategy allows for larger installations capable of supplying hundreds and potentially thousands of MWe of generation capacity, driving significant revenue growth per site.
  3. Expansion to Multiple Sites: Following initial single-site deployments, Deep Fission plans to expand its commercial operations to multiple sites, increasing its overall market reach and power generation capacity across different locations.
  4. Capitalizing on AI-Driven Energy Demand: Deep Fission is strategically positioning its Gravity Reactor to meet the rapidly increasing demand for energy, particularly from AI-driven sectors. The ability to achieve deployment milestones on a timeline sufficient to address this surge in demand is a critical objective for the company, indicating a large potential market for its power generation.

AI Analysis | Feedback

Inbound Investments

  • Deep Fission is currently participating in the U.S. Department of Energy (“DOE”) Reactor Pilot Program, through which it expects to demonstrate its system.

Capital Expenditures

  • Deep Fission has commenced initial field development activities at its Kansas Site, including drilling its first data acquisition well up to 6,000 feet deep.
  • The company plans to focus the balance of this year and into early 2027 on the delivery of key components for full-system installation, including well casing, its reactor canister, heat exchanger, and LEU fabrication and loading.
  • Deep Fission has a long-term lease for approximately 100 acres located within the Great Plains Industrial Park in Parsons, Kansas, for its development activities.

Recent Active Movers

Peer Comparisons

Peers to compare with:

Financials

FISNBWXTGEVSMRLEUOKLOMedian
NameDeep Fis.BWX Tech.GE Verno.NuScale .Centrus .Oklo  
Mkt Price9.72157.44900.287.59159.6936.8497.14
Mkt Cap0.614.4241.32.43.26.34.7
Rev LTM-3,37641,367194520452
Op Inc LTM-3341,803-71230-17330
FCF LTM-32812,438-753-61-153-61
FCF 3Y Avg-2855,670-3428-146
CFO LTM-52214,139-752-21-88-21
CFO 3Y Avg-4536,805-34124-238

Growth & Margins

FISNBWXTGEVSMRLEUOKLOMedian
NameDeep Fis.BWX Tech.GE Verno.NuScale .Centrus .Oklo  
Rev Chg LTM-21.4%13.0%-61.9%-4.1%-4.5%
Rev Chg 3Y Avg-14.3%-42.1%15.3%-15.3%
Rev Chg Q-26.1%21.9%-95.8%4.9%-13.4%
QoQ Delta Rev Chg LTM-5.6%5.1%-40.7%0.8%-2.9%
Op Inc Chg LTM-2.9%175.7%-447.2%-61.4%-172.8%-61.4%
Op Inc Chg 3Y Avg-1.6%--135.2%7.1%-1.6%
Op Mgn LTM-9.9%4.4%-3,812.6%6.7%-5.6%
Op Mgn 3Y Avg-11.7%2.2%-1,830.4%11.6%-6.9%
QoQ Delta Op Mgn LTM--0.2%0.5%-1,622.0%-4.4%--2.3%
CFO/Rev LTM-15.5%34.2%-4,025.4%-4.6%-5.4%
CFO/Rev 3Y Avg-15.7%17.3%-1,718.1%6.0%-10.8%
FCF/Rev LTM-9.7%30.1%-4,035.5%-13.6%--1.9%
FCF/Rev 3Y Avg-9.9%14.3%-1,724.0%2.4%-6.1%

Valuation

FISNBWXTGEVSMRLEUOKLOMedian
NameDeep Fis.BWX Tech.GE Verno.NuScale .Centrus .Oklo  
Mkt Cap0.614.4241.32.43.26.34.7
P/S-4.35.8130.07.0-6.4
P/Op Inc-43.2133.8-3.4103.5-36.343.2
P/EBIT-31.7133.8-3.440.6-36.331.7
P/E-41.925.3-6.352.1-48.725.3
P/CFO-27.717.1-3.2-153.3-71.5-3.2
Total Yield-3.0%4.1%-15.9%1.9%-2.1%1.9%
Dividend Yield0.0%0.7%0.2%0.0%0.0%0.0%0.0%
FCF Yield 3Y Avg-2.3%3.3%-14.7%1.1%-1.7%
D/E0.00.10.00.00.40.00.0
Net D/E-0.10.1-0.0-0.4-0.2-0.4-0.2

Returns

FISNBWXTGEVSMRLEUOKLOMedian
NameDeep Fis.BWX Tech.GE Verno.NuScale .Centrus .Oklo  
1M Rtn-12.0%-16.8%-18.3%-26.0%-0.3%-30.2%-17.6%
3M Rtn-11.8%-24.2%-15.3%-33.0%-16.8%-43.3%-20.5%
6M Rtn-11.8%-27.0%26.7%-62.9%-52.7%-61.0%-39.9%
12M Rtn-11.8%5.4%42.6%-84.5%-28.7%-48.1%-20.3%
3Y Rtn-11.8%135.2%545.8%7.7%351.1%256.6%195.9%
1M Excs Rtn-10.4%-15.1%-16.7%-24.4%1.3%-28.5%-15.9%
3M Excs Rtn-14.3%-29.6%-19.8%-38.3%-24.8%-49.2%-27.2%
6M Excs Rtn-16.6%-30.5%25.3%-65.3%-53.2%-61.6%-41.9%
12M Excs Rtn-26.3%-8.8%24.8%-99.6%-47.8%-65.7%-37.0%
3Y Excs Rtn-72.4%70.7%485.1%-57.5%306.2%196.3%133.5%

Comparison Analyses

null

Financials

Price Behavior

null
FISN Betas & Captures as of 6/30/2026

 1M2M3M6M1Y3Y
Beta1.230.890.530.300.190.04
Up Beta0.330.760.050.180.210.03
Down Beta-5.18-2.73-2.02-0.91-0.46-0.11
Up Capture455%224%109%67%29%3%
Bmk +ve Days11244067140429
Stock +ve Days555555
Down Capture307%241%212%89%59%32%
Bmk -ve Days10172358112321
Stock -ve Days333333

[1] Upside and downside betas calculated using positive and negative benchmark daily returns respectively
Based On 1-Year Data
Annualized
Return
Annualized
Volatility
Sharpe
Ratio
Correlation
with FISN
FISN-33.3%117.9%-2.61-
Sector ETF (XLI)15.6%16.9%0.69-24.7%
Equity (SPY)15.6%12.8%0.8621.8%
Gold (GLD)21.6%28.1%0.6850.1%
Commodities (DBC)31.5%19.7%1.2734.0%
Real Estate (VNQ)15.9%14.0%0.82-20.0%
Bitcoin (BTCUSD)-46.1%42.9%-1.3214.4%

Smart multi-asset allocation framework can stack odds in your favor. Learn How
Based On 5-Year Data
Annualized
Return
Annualized
Volatility
Sharpe
Ratio
Correlation
with FISN
FISN-7.8%117.9%-2.61-
Sector ETF (XLI)12.9%17.6%0.57-24.7%
Equity (SPY)12.4%17.1%0.5521.8%
Gold (GLD)17.1%18.4%0.7550.1%
Commodities (DBC)9.3%19.5%0.3634.0%
Real Estate (VNQ)2.9%18.9%0.05-20.0%
Bitcoin (BTCUSD)14.7%53.3%0.4614.4%

Smart multi-asset allocation framework can stack odds in your favor. Learn How
Based On 10-Year Data
Annualized
Return
Annualized
Volatility
Sharpe
Ratio
Correlation
with FISN
FISN-4.0%117.9%-2.61-
Sector ETF (XLI)13.6%20.0%0.60-24.7%
Equity (SPY)14.7%17.9%0.7021.8%
Gold (GLD)11.3%16.1%0.5750.1%
Commodities (DBC)7.1%18.0%0.3234.0%
Real Estate (VNQ)5.1%20.7%0.21-20.0%
Bitcoin (BTCUSD)57.7%66.2%0.9814.4%

Smart multi-asset allocation framework can stack odds in your favor. Learn How

Short Interest

Short Interest: As Of Date7152026
Short Interest: Shares Quantity0.5 Mil
Short Interest: % Change Since 6302026-34.5%
Average Daily Volume0.2 Mil
Days-to-Cover Short Interest2.6 days
Basic Shares Quantity63.9 Mil
Short % of Basic Shares0.8%

SEC Filings

Expand for More
Report DateFiling DateFiling
03/31/202605/20/2026S-1
Collapse to Preview
Report DateFiling DateFiling
03/31/202605/20/2026S-1

Insider Activity

Updated 7/27/2026
Expand for More
#OwnerTitleHoldingActionFiling DatePriceSharesTransacted
Value
Value of
Held Shares
Form
1Tompkins, Mark NDirectSell82820250.0025,0002472Form
2Jacobs, Ian SethPresident, CEO, CFO, SecretaryDirectBuy82820250.0025,000228Form
Collapse to Preview
#OwnerTitleHoldingActionFiling DatePriceSharesTransacted
Value
Value of
Held Shares
Form
1Tompkins, Mark NDirectSell82820250.0025,0002472Form
2Jacobs, Ian SethPresident, CEO, CFO, SecretaryDirectBuy82820250.0025,000228Form

Investor Activity (13F)

Updated Jul 30, 2026
13F holdings as of Mar 31, 2026 (Q1 2026)

Active managers (13F portfolio over $250M, at least 3 holdings) with a position over $5M that is either over 10% of their portfolio or held in a concentrated book of 50 or fewer total positions. Index/ETF, sovereign, bank, community-bank and charitable/donor-advised filers are excluded.

Active ManagerValue% of PortfolioTotal PositionsQoQFiling
Boothe Investment Group, Inc.$14.7 Mil4.7%40Hold13F
Active Manager
Active Manager
Active ManagerValue% of PortfolioTotal PositionsQoQFiling
Boothe Investment Group, Inc.$14.7 Mil4.7%40Hold13F
Core Cache Last Updated: 7/29/2026