Business Overview: Deep Fission, Inc. (NASDAQ: FISN)

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Executive Summary

Deep Fission, Inc. is a Berkeley, California-based nuclear energy technology company developing an underground small modular reactor (SMR) it calls the Gravity Reactor. Legacy Deep Fission Nuclear, Inc. was incorporated in July 2023, and the company became a public, SEC-reporting entity in September 2025 through a reverse merger with Surfside Acquisition Inc., a Delaware shell company formed in 2021, which was then renamed Deep Fission, Inc.

The company is pre-revenue and development-stage: it states plainly in its own 10-K that it "has not constructed or operated a commercial reactor or generated revenue." It matters in this universe as a concrete example of the current wave of advanced-nuclear/SMR companies racing to commercialize next-generation reactor designs for AI-data-center and grid power demand, differentiated specifically by placing its reactor roughly a mile underground rather than in a conventional surface containment structure.

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1. Core Business Model & How They Work

Deep Fission has not yet generated revenue, but its 10-K lays out three intended future revenue streams once reactors reach commercial deployment.

[ Site Leasing & Borehole Drilling ] ➡️ [ Gravity Reactor Module Installed ~1 Mile Underground ] ➡️ [ Heat Exchanger ] ➡️ [ Surface Power Conversion & Grid Interconnection ] ➡️ [ Electricity Sold to Offtakers ]

Intended Revenue Streams

1. Project-level equity participation: ownership stakes in individual reactor projects, with indirect participation in electricity-sale cash flows, often structured through long-term power purchase agreements (PPAs).
2. Upfront revenue: one-time fees for reactor delivery, integration, and project-development or EPC (engineering, procurement, construction)-related support.
3. Recurring revenue: technology licensing fees plus operations and maintenance (O&M) services over the operating life of each installation.

The Technology

The Gravity Reactor uses established pressurized water reactor (PWR) technology fueled by low-enriched uranium (LEU), but installs the reactor module inside a cased, 30- to 50-inch-diameter vertical borehole roughly a mile underground, drilled using methods borrowed from the oil, gas, and geothermal industries. The surrounding rock and water column are meant to provide pressure support, cooling, and radiation shielding, so that surface infrastructure is limited to power conversion, monitoring/control, and grid interconnection equipment. Each reactor module targets up to 15 megawatts electric (MWe), with clusters of boreholes at a single site intended to scale to hundreds or thousands of MWe.

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2. Current Development Status (in place of Business Segments)

Deep Fission operates as a single development-stage effort rather than multiple reportable segments. Its real, documented progress to date includes:

• Kansas pilot site: roughly 100 acres leased in Parsons, Kansas, with a first data-acquisition well drilled to 6,000 feet.
• DOE Reactor Pilot Program: selected in August 2025, with an Other Transaction Agreement signed November 17, 2025 — this grants a regulatory/authorization pathway and program oversight, but no direct DOE funding, and later program phases are not yet fully funded.
• Phased commercialization plan: Phase 1 covers proof-of-concept wells; Phase 2 covers DOE authorization and a targeted commercial license application in the first half of 2027; Phase 3 covers high-volume licensing, targeted as early as 2027.
• NRC engagement: pre-application discussions with the Nuclear Regulatory Commission since March 2024; the company does not expect to file a comprehensive commercial licensing application before late 2026.
• Non-binding commercial interest: letters of intent for candidate sites across Kansas, Texas, Utah, and elsewhere (potentially supporting up to 12.5 GW in aggregate), a November 2024 term sheet with Endeavour Energy for up to 1.5 GW at one location, and a February 2026 memorandum of understanding with Blue Owl that includes a $20 million equity investment and rights of first offer. None of these commits a counterparty to purchase power, finance a project, or deploy reactors.

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3. Key Offerings (Planned)

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4. Competitive Landscape

Deep Fission is one of many venture-backed and newly public advanced-nuclear developers racing toward commercialization, and its own 10-K names its competitive set directly.

                 Underground / Novel Siting
                           |
                 Deep Fission (Gravity Reactor)
                           |
Advanced Reactor Design  --+--  Conventional Light-Water SMR Design
                           |
    TerraPower, X-energy,  |   NuScale Power, Last Energy,
    Kairos Power, Oklo     |   GE-Hitachi, Westinghouse, Holtec
                           |
                 Surface-Sited (industry standard)

• Oklo, TerraPower, X-energy, Kairos Power — advanced (non-light-water or novel-fuel) reactor developers competing for the same early commercialization window, government pilot programs, and capital.
• NuScale Power, Last Energy, GE-Hitachi, Westinghouse, Holtec — light-water SMR developers pursuing conventional surface-sited designs, generally further along in licensing and commercial deployment than Deep Fission.
• Westinghouse, EDF, GE-Hitachi — large, established conventional reactor vendors with far greater balance sheets, existing fleets, and regulatory track records.
• Wind, solar, natural gas, and energy storage — the 10-K explicitly names these as competing power sources for the same data-center and grid demand that advanced nuclear is targeting.

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5. Strategic Strengths & Risks

Strengths

1. Differentiated siting approach: placing the reactor roughly a mile underground is a genuinely distinct engineering bet versus the surface-containment designs of nearly every named competitor, potentially reducing surface footprint, physical security costs, and some categories of risk.
2. Government program validation: selection into the DOE Reactor Pilot Program (August 2025) provides a real, if non-funding, regulatory pathway and third-party validation of the technology's seriousness.
3. Early strategic capital interest: the Blue Owl memorandum (February 2026, $20 million equity investment with rights of first offer) and the Endeavour Energy term sheet signal genuine, if non-binding, interest from capital and offtake partners.

Risks

1. No proven technology at commercial scale: by the company's own admission, it has not built or operated a commercial reactor, and key engineering aspects of the underground design remain unresolved.
2. No revenue and no secured funding for later phases: the pilot and additional borehole phases are not fully funded, meaning Deep Fission will likely need significant additional capital raises (it priced a ~$40 million follow-on offering at $16/share in mid-2026) before any commercial reactor is built.
3. All commercial interest is non-binding: every letter of intent, term sheet, and MOU disclosed explicitly does not commit any counterparty to purchase power or finance a project — there is no contracted revenue backlog.
4. Regulatory and timeline uncertainty: NRC licensing, DOE authorization, and NEPA environmental review timelines are uncertain and subject to legal challenge; the company does not expect to file a full commercial license application before late 2026.
5. Crowded, well-funded competitive field: Oklo, NuScale, X-energy, TerraPower, and major incumbents like Westinghouse and GE-Hitachi are all pursuing the same advanced-nuclear opportunity, several with more capital and a longer regulatory head start.

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6. Financial Overview

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7. Summary Conclusion

Deep Fission is a genuine, if very early-stage, operating company pursuing a technically differentiated approach to small modular nuclear power — underground reactor siting — that sets it apart from the more crowded field of surface-sited SMR developers. Its moat, to the extent one exists at this stage, derives from its specific engineering approach and the regulatory/government validation it has begun to accumulate (the DOE Reactor Pilot Program selection), rather than from revenue, scale, or customer lock-in, none of which yet exist.

The single biggest forward risk is execution and funding risk: every piece of commercial interest disclosed is non-binding, later development phases are not fully funded, and the company must navigate a long, uncertain NRC licensing path while competing against better-capitalized and more regulatorily advanced rivals (Oklo, NuScale, TerraPower, X-energy) for the same emerging advanced-nuclear demand from data centers and grid operators.