Deep Fission, Inc. is seeking to raise roughly $150m through a Nasdaq IPO as investors increasingly search for nuclear energy companies capable of supporting the AI-driven electricity boom. The underground reactor developer plans to list under the ticker FISN.

Key Highlights

  • Deep Fission plans to list on Nasdaq under the ticker “FISN”.
  • The IPO is expected to price between $24 and $26 per share.
  • The company aims to raise approximately $150m from the offering.
  • Deep Fission is developing underground small modular nuclear reactors.
  • AI data centre electricity Demand is becoming a central Investment theme.

Deep Fission IPO Revives Investor Appetite for Advanced Nuclear Energy

Deep Fission, Inc., a California-based nuclear technology start-up developing underground small modular reactors, is preparing to test investor appetite for one of the market’s more speculative infrastructure themes: nuclear power for the artificial intelligence economy.

The company has filed for a Nasdaq initial public offering under the ticker symbol “FISN”, with shares expected to price between $24 and $26. At the midpoint of the range, Deep Fission would raise roughly $150m and command a valuation approaching $1.7bn.

According to IPO calendar data, the company is expected to begin trading on Nasdaq on May 29, although the final listing date remains subject to pricing and regulatory approvals.

The offering arrives at a moment when investors are increasingly revisiting nuclear energy as technology companies race to secure long-duration electricity supplies for artificial intelligence infrastructure and hyperscale data centres.

Deep Fission is attempting to distinguish itself within the increasingly crowded small modular reactor sector through an unconventional proposition: placing nuclear reactors roughly one mile underground.

Why Deep Fission’s Underground Reactor Model Has Drawn Attention

Unlike many advanced reactor companies pursuing entirely new reactor chemistries, Deep Fission is building around established pressurised water reactor (“PWR”) technology while radically altering deployment architecture.

Its proposed “Gravity Reactor” would operate inside deep boreholes beneath the Earth’s surface. The company argues that underground emplacement could use surrounding geology and hydrostatic pressure as part of the reactor’s containment, cooling and shielding systems.

Management believes the approach could reduce the need for large surface containment structures and potentially lower construction costs relative to conventional nuclear facilities.

Each reactor is designed to produce up to 15 megawatts electric (“MWe”), while clustered installations could potentially support much larger generation capacity over time.

For investors, the concept sits directly at the intersection of several themes currently dominating infrastructure markets:

  • AI electricity demand
  • energy security
  • decarbonisation
  • grid resilience
  • defence-linked infrastructure
  • next-generation nuclear power

AI Infrastructure Is Reshaping the Nuclear Investment Narrative

The rapid expansion of artificial intelligence computing has materially altered the investment case for nuclear energy developers.

Large-scale AI Training models and hyperscale cloud infrastructure require enormous amounts of stable electricity, intensifying concerns about grid capacity constraints across the United States and Europe.

Technology companies increasingly want reliable carbon-free baseload power capable of operating independently from intermittent renewable generation.

This has triggered renewed enthusiasm for nuclear infrastructure Assets, uranium producers and advanced reactor developers.

Deep Fission has explicitly linked its commercialisation timeline to the expected surge in AI-related electricity consumption.

The company says its phased deployment strategy is designed to move toward commercialisation within the next three years, while simultaneously pursuing Department of Energy demonstration efforts and Nuclear Regulatory Commission licensing.

IPO Investors Face Significant Execution Risk

Despite the growing enthusiasm surrounding nuclear infrastructure, Deep Fission remains a development-stage company with no operating reactor and no commercial Revenue.

Its current activities include:

  • geological testing
  • borehole drilling research
  • reactor engineering
  • safety analysis
  • regulatory engagement
  • site development

The company has already drilled an initial data Acquisition well at its Kansas development site and plans additional engineering and drilling activities over the coming months.

Still, the risks remain substantial.

Deep Fission’s reactor concept has not yet been commercially validated, and nuclear licensing timelines have historically proven difficult to predict. Investors must also consider the financial demands associated with advanced nuclear development.

Recent filings indicate the company remains dependent on external financing while continuing to generate operating losses.

Auditors have also raised “Going Concern” language regarding the company’s Liquidity position absent additional Capital raising.

Why Wall Street Is Watching Nuclear IPOs Again

Even so, the broader market backdrop has become increasingly supportive for nuclear-related listings.

Over the past year, institutional investors have returned aggressively to sectors tied to strategic infrastructure and energy security. Nuclear energy, once politically sidelined in many markets, has regained favour amid rising electricity demand forecasts and decarbonisation pressures.

The AI boom has accelerated that reassessment.

For investment banks, companies such as Deep Fission represent an attempt to bring high-growth infrastructure narratives back into public markets following the collapse of many speculative SPAC-era ventures.

Whether investors ultimately embrace Deep Fission’s underground reactor thesis may depend less on near-term revenue visibility and more on confidence that nuclear power will become essential to the next phase of AI infrastructure expansion.

The Bottom Line on the Deep Fission IPO

Deep Fission’s proposed Nasdaq listing reflects Wall Street’s growing conviction that electricity generation could become one of the defining investment bottlenecks of the AI era.

The company’s underground reactor concept remains highly experimental, capital intensive and operationally unproven. Yet its timing appears carefully aligned with a broader market shift back toward nuclear infrastructure and energy resilience.

At an expected IPO range of $24 to $26 per share, investors are effectively being asked to finance a long-duration bet on the future of advanced nuclear deployment.

Whether Deep Fission ultimately becomes a commercially viable nuclear infrastructure platform remains uncertain. But in a market increasingly focused on powering artificial intelligence, the company has already succeeded in positioning itself at the centre of one of Wall Street’s fastest-growing thematic trades.