Stock Markets May 20, 2026 06:22 AM

Deep Fission Launches Roadshow for $150 Million Share Sale

Nuclear start-up seeks Nasdaq listing as it lines up underwriters and a 30-day greenshoe option

By Priya Menon

Deep Fission Inc. has begun marketing a proposed public offering of 6 million common shares, targeting a price range of $24.00 to $26.00 per share and seeking a Nasdaq Global Market listing under the ticker FISN. The company has provided underwriters a 30-day option to acquire up to 900,000 additional shares and says net proceeds will support engineering, R&D, licensing and construction of its first pilot underground small modular reactor, alongside general working capital needs. A registration statement has been filed with the Securities and Exchange Commission but is not yet effective.

Deep Fission Launches Roadshow for $150 Million Share Sale

Key Points

  • Deep Fission has started a roadshow for a proposed offering of 6 million common shares, targeting $24.00 to $26.00 per share.
  • The company granted underwriters a 30-day option to buy up to 900,000 additional shares and has applied to list on the Nasdaq Global Market under the ticker FISN.
  • Net proceeds are intended for working capital and corporate purposes, including engineering, R&D, licensing and construction of the company’s first pilot underground small modular reactor - impacting the nuclear energy and capital markets sectors.

Deep Fission Inc., a nuclear energy company developing underground small modular reactors, has initiated a roadshow to market a proposed public offering of common stock. The company plans to offer 6 million shares, with an indicated price range of $24.00 to $26.00 per share, according to a company statement.

Under the terms disclosed, Deep Fission has granted the offering underwriters a 30-day option to purchase up to an additional 900,000 shares at the initial public offering price, less underwriting discounts and commissions. The company has also submitted an application to list its common stock on the Nasdaq Global Market under the ticker symbol "FISN."

Deep Fission described the intended uses of the net proceeds as general working capital and corporate purposes. The company specifically identified engineering, research and development, licensing and the construction of its first pilot nuclear reactor, as well as related technologies, as areas that would be funded from the offering.

Investment banks leading the transaction were named in the company statement. William Blair, Stifel, and Canaccord Genuity are serving as joint lead book-running managers. Seaport Global Securities and Benchmark, a StoneX Company, are acting as bookrunners.

The company has filed a registration statement with the Securities and Exchange Commission in connection with the proposed offering; however, that registration statement has not yet become effective. The pending status of the filing means the offering remains subject to regulatory clearance before it can proceed to completion.

Deep Fission develops small modular pressurized water reactors that the company says are designed for installation one mile underground. The proposed capital raise and Nasdaq listing represent steps the company is taking to secure funding for early-stage development, licensing activities and the construction of its initial pilot facility.


Contextual note - Information above is drawn from the company statement and its regulatory filing; the registration remains pending and the offering is subject to the conditions and approvals described by the company.

Risks

  • The company has filed a registration statement with the SEC that has not yet become effective, creating uncertainty about the timing and completion of the offering - this impacts investors and the capital markets sector.
  • Granting underwriters a 30-day option to purchase additional shares may result in greater share dilution if exercised - this is a market and equity-issuance risk for potential shareholders.
  • Proceeds are planned for technical, licensing and construction activities for a pilot reactor, which are inherently uncertain in outcome and timing - this affects the nuclear energy and industrial technology sectors.

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