Stock Markets May 20, 2026 06:22 AM

Deep Fission launches investor roadshow for $150 million common stock offering

Nuclear startup seeks Nasdaq listing and plans to finance pilot underground small modular reactor with proposed sale

By Avery Klein

Deep Fission Inc. has begun a roadshow for 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 granted underwriters a 30-day option to purchase up to 900,000 additional shares. Net proceeds are intended for working capital, engineering, R&D, licensing and construction of its first pilot underground small modular reactor. A registration statement has been filed with the Securities and Exchange Commission but has not yet become effective.

Deep Fission launches investor roadshow for $150 million common stock offering

Key Points

  • Deep Fission is proposing to sell 6 million common shares at an expected price range of $24.00 to $26.00 per share and granted underwriters a 30-day option for up to 900,000 additional shares - impacts capital markets and equity investors.
  • The company has applied to list on the Nasdaq Global Market under the ticker FISN - affects public listings and market liquidity for energy and technology stocks.
  • Planned use of proceeds includes engineering, research and development, licensing and construction of a first pilot underground small modular reactor - relevant to the energy and nuclear technology sectors.

Deep Fission Inc., a company focused on developing underground small modular nuclear reactors, has kicked off an investor roadshow tied to a planned public offering of common stock. The proposed deal comprises 6 million shares with an anticipated pricing range between $24.00 and $26.00 per share, according to a company statement.

The company has given its underwriters a 30-day option to purchase as many as an additional 900,000 shares at the initial public offering price, less underwriting discounts and commissions. Deep Fission has filed to list its common stock on the Nasdaq Global Market, proposing the ticker symbol "FISN."

Deep Fission disclosed that net proceeds from the transaction are intended to support general working capital and corporate purposes. The company specified several uses for the funds, including engineering, research and development, licensing and the construction of its first pilot nuclear reactor and related technologies.

On the underwriting side, William Blair, Stifel and Canaccord Genuity are named as joint lead book-running managers for the offering. Seaport Global Securities and Benchmark, a StoneX Company, are listed as additional bookrunners.

The company has submitted a registration statement to the Securities and Exchange Commission in connection with the planned offering. That registration statement has been filed but has not yet become effective, a step the company noted in its filing.

Deep Fission develops small modular pressurized water reactors designed for installation approximately one mile underground, the company said. Beyond the technical description, the filing focuses on the mechanics of the proposed equity raise, the intended allocation of proceeds and the underwriting arrangements that would govern the offering.

The roadshow commencement signals the company is advancing toward a public equity transaction, but the filing-specific disclosures underscore that certain regulatory and administrative steps remain. The statement does not assert that the registration is effective, nor does it provide timing for listing or closing. The underwriters' 30-day option also means the total number of shares sold could increase if the option is exercised during that period.


Clear summary

Deep Fission has started a roadshow for a planned sale of 6 million common shares, with a $24.00 to $26.00 price range and an underwriter option for up to 900,000 additional shares. The company aims to list on the Nasdaq Global Market under the ticker FISN and intends to use proceeds for working capital, engineering, R&D, licensing and construction of its first pilot underground reactor. A registration statement has been filed with the SEC but is not yet effective.

Risks

  • The registration statement filed with the Securities and Exchange Commission has not yet become effective - the offering may be delayed or may not proceed until regulatory prerequisites are satisfied, which affects timing for capital markets participants.
  • Underwriters have a 30-day option to purchase up to 900,000 additional shares at the initial offering price, less discounts and commissions - the ultimate size of the offering could expand, affecting dilution and the capital raised.
  • Proceeds are intended for licensing and construction of a pilot reactor and related technologies - successful deployment depends on the company securing and allocating the raised funds as planned, which introduces execution uncertainty for the energy and nuclear sectors.

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