Stock Markets May 20, 2026 06:22 AM

Deep Fission launches investor roadshow for $150 million equity sale

Underground small modular reactor developer files for Nasdaq listing and outlines use of proceeds for pilot reactor and related technology

By Derek Hwang

Deep Fission Inc. has begun a roadshow for a proposed public offering of 6 million common shares, aiming to price the shares between $24.00 and $26.00 and seeking a Nasdaq Global Market listing under the ticker FISN. The company has given underwriters a 30-day option to buy up to 900,000 additional shares and has filed a registration statement with the SEC that has not yet become effective. Proceeds are intended to support engineering, R&D, licensing, and construction of a pilot underground small modular reactor, along with general corporate needs.

Deep Fission launches investor roadshow for $150 million equity sale

Key Points

  • Deep Fission has launched a roadshow for a planned public offering of 6 million common shares, with an expected price range of $24.00 to $26.00 per share.
  • Underwriters have a 30-day option to purchase up to 900,000 additional shares at the IPO price, subject to underwriting discounts and commissions.
  • Net proceeds are intended for general corporate purposes, and specifically for engineering, R&D, licensing, and construction of a pilot underground small modular pressurized water reactor.

Deep Fission Inc., a company focused on developing underground small modular nuclear reactors, has initiated a roadshow tied to a proposed public offering of its common stock. The firm proposes to sell 6,000,000 shares and is targeting a per-share price in the range of $24.00 to $26.00, according to the company's statement.

Under the terms disclosed, Deep Fission has granted the offering underwriters a 30-day option to acquire up to an additional 900,000 shares at the initial public offering price, less underwriting discounts and commissions. The company has applied to have its common shares listed on the Nasdaq Global Market using the ticker symbol "FISN."

The filing indicates the intended uses for net proceeds from the proposed offering. Deep Fission plans to allocate funds to general working capital and corporate purposes, and specifically to engineering, research and development, licensing activities, and construction related to its first pilot nuclear reactor and associated technologies.

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 identified as bookrunners.

The company has filed a registration statement with the U.S. Securities and Exchange Commission in connection with the planned sale, but that registration statement has not yet become effective. Deep Fission's reactor design is described as a small modular pressurized water reactor intended for installation approximately one mile underground.


Context and next steps

The company is in the roadshow phase, during which potential investors are briefed ahead of a final offering price and the possible completion of the registration process with the SEC. If the underwriters exercise their option in the 30-day window, up to 900,000 additional shares could be sold at the IPO price, subject to customary discounts and commissions.

Investors and market participants will be monitoring the SEC registration status, the final price set within the $24.00 to $26.00 range, and whether the underwriters exercise their option, as these elements will determine the ultimate size and structure of the transaction.

Risks

  • The registration statement filed with the Securities and Exchange Commission has not yet become effective, creating uncertainty about the timing and completion of the offering.
  • The company only expects to price shares between $24.00 and $26.00, indicating the final offering price remains subject to change.
  • Underwriters have an option to buy up to an additional 900,000 shares in a 30-day period, which could alter the total shares sold under the offering.

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