Deep Fission, Inc. (&#34;Deep Fission&#34; or the &#34;Company&#34;), an advanced nuclear energy company developing small modular pressurized water reactors installed one mile underground, today announced the pricing of its public

<p xmlns="http://www.w3.org/1999/xhtml"><b xmlns="http://www.w3.org/1999/xhtml">Deep Fission, Inc.</b> ("Deep Fission" or the "Company"), an advanced nuclear energy company developing small modular pressurized water reactors installed one mile underground, today announced the pricing of its public offering of 2,500,000 shares of its common stock at a public offering price of $16.00 per share, for total gross proceeds of $40 million. In addition, Deep Fission has granted the underwriters a 30-day option to purchase up to an additional 375,000 shares of its common stock at the initial public offering price, less underwriting discounts and commissions. Deep Fission's common stock has been approved for listing on the Nasdaq Global Market under the symbol "FISN" and is expected to begin trading on June 18, 2026. The offering is anticipated to close on June 22, 2026, subject to the satisfaction of customary closing conditions.</p><p xmlns="http://www.w3.org/1999/xhtml">Deep Fission intends to use the net proceeds from this offering for general working capital and corporate purposes, including towards the engineering, research and development, licensing and construction of its first pilot nuclear reactor and related technologies.</p><p xmlns="http://www.w3.org/1999/xhtml">Benchmark, a StoneX Company and Seaport Global Securities are acting as joint lead book-running managers and Maxim Group LLC is acting as co-manager for the offering.</p><p xmlns="http://www.w3.org/1999/xhtml">A registration statement relating to these securities has been filed with, and declared effective by, the Securities and Exchange Commission. The offering is being made only by means of a prospectus. Copies of the final prospectus relating to the offering may be obtained, when available, from The Benchmark Company, LLC, 150 East 58th Street, 17th Floor, New York, NY 10155, Attention: Prospectus Department, or by email at <a xmlns="http://www.w3.org/1999/xhtml" rel="nofollow" href="mailto:prospectus@benchmarkcompany.com" shape="rect">prospectus@benchmarkcompany.com</a>, and Seaport Global Securities LLC, 360 Madison Avenue, 22nd Floor, New York, NY 10017, Attention: Capital Markets, or by email at <a xmlns="http://www.w3.org/1999/xhtml" rel="nofollow" href="mailto:Operations@seaportglobal.com" shape="rect">Operations@seaportglobal.com</a>.</p><p xmlns="http://www.w3.org/1999/xhtml">This press release does not constitute an offer to sell or the solicitation of an offer to buy any securities, nor shall there be any sale of these securities in any state or jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.</p><p xmlns="http://www.w3.org/1999/xhtml"><b xmlns="http://www.w3.org/1999/xhtml">About Deep Fission</b></p><p xmlns="http://www.w3.org/1999/xhtml">Deep Fission is revolutionizing the energy landscape with innovative technology that places a small modular pressurized water reactor in a borehole approximately one mile underground. The company's Gravity Nuclear Reactor&#x2122; approach combines established pressurized water reactor technology with a novel underground deployment model designed to simplify construction, enhance safety, and support rapid, scalable commercial deployment. Founded and led by a team of experienced scientists, engineers, and entrepreneurs, Deep Fission is focused on delivering reliable, low-carbon baseload power to meet growing electricity demand from utilities, industrial customers, and data centers. The company is currently advancing the development of its first reactor project in Parsons, Kansas and was selected for the Department of Energy's Reactor Pilot Program.</p><p xmlns="http://www.w3.org/1999/xhtml"><b xmlns="http://www.w3.org/1999/xhtml">Forward-Looking Statements</b></p><p xmlns="http://www.w3.org/1999/xhtml">Certain statements in this press release are "forward-looking statements," including statements regarding the consummation of the public offering. These statements are based on current expectations and involve risks and uncertainties that could cause actual results to differ materially from those expressed or implied. Important factors that may affect actual results are described under "Risk Factors" and "Cautionary Note on Forward-Looking Statements" in Deep Fission's Registration Statement on Form S-1 filed with the U.S. Securities and Exchange Commission (as amended or supplemented), and in other filings Deep Fission makes with the SEC. Forward-looking statements speak only as of the date of this press release. Deep Fission undertakes no obligation to update any forward-looking statements, whether as a result of new information, future events, or otherwise, except as required by law.</p><p xmlns="http://www.w3.org/1999/xhtml"><img xmlns="http://www.w3.org/1999/xhtml" alt="" src="https://cts.businesswire.com/ct/CT?id=bwnews&amp;sty=20260617055280r1&amp;sid=benz2&amp;distro=nx&amp;lang=en" style="width:0;height:0"></img><span xmlns="http://www.w3.org/1999/xhtml" class="bwct31415"></span></p><p xmlns="http://www.w3.org/1999/xhtml" id="mmgallerylink"><span xmlns="http://www.w3.org/1999/xhtml" id="mmgallerylink-phrase">View source version on businesswire.com: </span><span xmlns="http://www.w3.org/1999/xhtml" id="mmgallerylink-link"><a xmlns="http://www.w3.org/1999/xhtml" href="https://www.businesswire.com/news/home/20260617055280/en/" rel="nofollow">https://www.businesswire.com/news/home/20260617055280/en/</a></span></p><p xmlns="http://www.w3.org/1999/xhtml" class="bwalignl"><b xmlns="http://www.w3.org/1999/xhtml">Media Contact</b><br xmlns="http://www.w3.org/1999/xhtml"></br>Chloe Frader<br xmlns="http://www.w3.org/1999/xhtml"></br><a xmlns="http://www.w3.org/1999/xhtml" rel="nofollow" href="mailto:media@deepfission.com" shape="rect">media@deepfission.com</a></p><p xmlns="http://www.w3.org/1999/xhtml" class="bwalignl"><b xmlns="http://www.w3.org/1999/xhtml">Investor Relations Contact</b><br xmlns="http://www.w3.org/1999/xhtml"></br>Bob Prag<br xmlns="http://www.w3.org/1999/xhtml"></br><a xmlns="http://www.w3.org/1999/xhtml" rel="nofollow" href="mailto:IR@deepfission.com" shape="rect">IR@deepfission.com</a><br xmlns="http://www.w3.org/1999/xhtml"></br>(858) 794-9500</p><p xmlns="http://www.w3.org/1999/xhtml" class="bwalignl"> Elevate IR<br xmlns="http://www.w3.org/1999/xhtml"></br>(720) 330-2829</p><p xmlns="http://www.w3.org/1999/xhtml" class="bwalignl"><br xmlns="http://www.w3.org/1999/xhtml"></br></p>

FISN

Advanced Nuclear Company Deep Fission Announces Pricing of Public Offering of Common Stock

Deep Fission prices IPO at $16, targeting $40M for first pilot reactor

<section class="insight" data-version="1">
  <section data-block="information">
    <h3>Information</h3>
    <p>Deep Fission, Inc. (&amp;#34;Deep Fission&amp;#34; or the &amp;#34;Company&amp;#34;), an advanced nuclear energy company developing small modular pressurized water reactors installed one mile underground, today announced the pricing of its public</p>
  </section>

  <section data-block="ai-summary-paragraph">
    <h3>AI Summary</h3>
    <p>Deep Fission priced its IPO at $16 per share, raising $40 million and granting a 30-day greenshoe. The shares will trade on Nasdaq Global Market under FISN, with an expected start June 18, 2026 and close June 22. Proceeds will fund engineering, R&amp;D, licensing, and the construction of its first Gravity Nuclear Reactor pilot in Parsons, Kansas, and support DOE Reactor Pilot Program activities.</p>
  </section>

  <section data-block="ai-summary-bullets">
    <h3>Key Points</h3>
    <ul><li>Deep Fission prices IPO at $16; aims to raise $40M.</li><li>Greenshoe option to buy up to 375,000 shares.</li><li>Trading begins June 18, 2026; closes June 22.</li><li>Proceeds fund engineering, R&amp;D, licensing, and first pilot reactor.</li><li>Company selected for DOE Reactor Pilot Program.</li></ul>
  </section>

  <section data-block="companies-mentioned">
    <h3>Companies Mentioned</h3>
    <ul><li><strong>Deep Fission, Inc. (FISN)</strong>: IPO pricing and Nasdaq listing; primary stock catalyst and funding milestone.</li><li><strong>Benchmark, a StoneX Company (N/A)</strong>: Joint lead book-running manager; private firm facilitating the offering.</li><li><strong>Seaport Global Securities LLC (N/A)</strong>: Joint lead manager; coordinating underwriter activities.</li><li><strong>Maxim Group LLC (N/A)</strong>: Co-manager; supports execution of the offering.</li></ul>
  </section>

  <section data-block="category">
    <h3>Corporate Developments</h3>
    <p>Category: Corporate Developments. The IPO marks a key financing event for Deep Fission and provides a near-term liquidity and dilution dynamic, while the DOE program and pilot-plan progress offer potential longer-term catalysts.</p>
  </section>

  <section data-block="market-moving">
    <h3>Market-Moving</h3>
    <ul><li>IPO priced at $16 with 2.5 million shares and a 375,000-share greenshoe.</li><li>Nasdaq Global Market listing confirmed; ticker FISN; trading begins June 18.</li><li>Proceeds of $40 million bolster cash runway for reactor development.</li><li>DOE Reactor Pilot Program selection adds external validation and potential funding support.</li></ul>
  </section>

  <section data-block="key-facts">
    <h3>Key Facts</h3>
    <ul><li>Offering: 2,500,000 shares at $16; gross $40,000,000.</li><li>Greenshoe option: up to 375,000 shares.</li><li>Trading begins June 18, 2026; closing June 22, 2026.</li><li>Listing: Nasdaq Global Market; ticker FISN.</li><li>Use of proceeds: working capital, R&amp;D, licensing, and first pilot reactor construction.</li></ul>
  </section>

  <section data-block="trading-thesis">
    <h3>Trading Thesis</h3>
    <p>Bullish on FISN over the next 3–6 months as the offering closes and the pilot program advances.</p>
  </section>
</section>


<p xmlns="http://www.w3.org/1999/xhtml"><b xmlns="http://www.w3.org/1999/xhtml">Deep Fission, Inc.</b> ("Deep Fission" or the "Company"), an advanced nuclear energy company developing small modular pressurized water reactors installed one mile underground, today announced the pricing of its public offering of 2,500,000 shares of its common stock at a public offering price of $16.00 per share, for total gross proceeds of $40 million. In addition, Deep Fission has granted the underwriters a 30-day option to purchase up to an additional 375,000 shares of its common stock at the initial public offering price, less underwriting discounts and commissions. Deep Fission's common stock has been approved for listing on the Nasdaq Global Market under the symbol "FISN" and is expected to begin trading on June 18, 2026. The offering is anticipated to close on June 22, 2026, subject to the satisfaction of customary closing conditions.</p><p xmlns="http://www.w3.org/1999/xhtml">Deep Fission intends to use the net proceeds from this offering for general working capital and corporate purposes, including towards the engineering, research and development, licensing and construction of its first pilot nuclear reactor and related technologies.</p><p xmlns="http://www.w3.org/1999/xhtml">Benchmark, a StoneX Company and Seaport Global Securities are acting as joint lead book-running managers and Maxim Group LLC is acting as co-manager for the offering.</p><p xmlns="http://www.w3.org/1999/xhtml">A registration statement relating to these securities has been filed with, and declared effective by, the Securities and Exchange Commission. The offering is being made only by means of a prospectus. Copies of the final prospectus relating to the offering may be obtained, when available, from The Benchmark Company, LLC, 150 East 58th Street, 17th Floor, New York, NY 10155, Attention: Prospectus Department, or by email at <a xmlns="http://www.w3.org/1999/xhtml" rel="nofollow" href="mailto:prospectus@benchmarkcompany.com" shape="rect">prospectus@benchmarkcompany.com</a>, and Seaport Global Securities LLC, 360 Madison Avenue, 22nd Floor, New York, NY 10017, Attention: Capital Markets, or by email at <a xmlns="http://www.w3.org/1999/xhtml" rel="nofollow" href="mailto:Operations@seaportglobal.com" shape="rect">Operations@seaportglobal.com</a>.</p><p xmlns="http://www.w3.org/1999/xhtml">This press release does not constitute an offer to sell or the solicitation of an offer to buy any securities, nor shall there be any sale of these securities in any state or jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.</p><p xmlns="http://www.w3.org/1999/xhtml"><b xmlns="http://www.w3.org/1999/xhtml">About Deep Fission</b></p><p xmlns="http://www.w3.org/1999/xhtml">Deep Fission is revolutionizing the energy landscape with innovative technology that places a small modular pressurized water reactor in a borehole approximately one mile underground. The company's Gravity Nuclear Reactor&#x2122; approach combines established pressurized water reactor technology with a novel underground deployment model designed to simplify construction, enhance safety, and support rapid, scalable commercial deployment. Founded and led by a team of experienced scientists, engineers, and entrepreneurs, Deep Fission is focused on delivering reliable, low-carbon baseload power to meet growing electricity demand from utilities, industrial customers, and data centers. The company is currently advancing the development of its first reactor project in Parsons, Kansas and was selected for the Department of Energy's Reactor Pilot Program.</p><p xmlns="http://www.w3.org/1999/xhtml"><b xmlns="http://www.w3.org/1999/xhtml">Forward-Looking Statements</b></p><p xmlns="http://www.w3.org/1999/xhtml">Certain statements in this press release are "forward-looking statements," including statements regarding the consummation of the public offering. These statements are based on current expectations and involve risks and uncertainties that could cause actual results to differ materially from those expressed or implied. Important factors that may affect actual results are described under "Risk Factors" and "Cautionary Note on Forward-Looking Statements" in Deep Fission's Registration Statement on Form S-1 filed with the U.S. Securities and Exchange Commission (as amended or supplemented), and in other filings Deep Fission makes with the SEC. Forward-looking statements speak only as of the date of this press release. Deep Fission undertakes no obligation to update any forward-looking statements, whether as a result of new information, future events, or otherwise, except as required by law.</p><p xmlns="http://www.w3.org/1999/xhtml"><img xmlns="http://www.w3.org/1999/xhtml" alt="" src="https://cts.businesswire.com/ct/CT?id=bwnews&amp;sty=20260617055280r1&amp;sid=benz2&amp;distro=nx&amp;lang=en" style="width:0;height:0"></img><span xmlns="http://www.w3.org/1999/xhtml" class="bwct31415"></span></p><p xmlns="http://www.w3.org/1999/xhtml" id="mmgallerylink"><span xmlns="http://www.w3.org/1999/xhtml" id="mmgallerylink-phrase">View source version on businesswire.com: </span><span xmlns="http://www.w3.org/1999/xhtml" id="mmgallerylink-link"><a xmlns="http://www.w3.org/1999/xhtml" href="https://www.businesswire.com/news/home/20260617055280/en/" rel="nofollow">https://www.businesswire.com/news/home/20260617055280/en/</a></span></p><p xmlns="http://www.w3.org/1999/xhtml" class="bwalignl"><b xmlns="http://www.w3.org/1999/xhtml">Media Contact</b><br xmlns="http://www.w3.org/1999/xhtml"></br>Chloe Frader<br xmlns="http://www.w3.org/1999/xhtml"></br><a xmlns="http://www.w3.org/1999/xhtml" rel="nofollow" href="mailto:media@deepfission.com" shape="rect">media@deepfission.com</a></p><p xmlns="http://www.w3.org/1999/xhtml" class="bwalignl"><b xmlns="http://www.w3.org/1999/xhtml">Investor Relations Contact</b><br xmlns="http://www.w3.org/1999/xhtml"></br>Bob Prag<br xmlns="http://www.w3.org/1999/xhtml"></br><a xmlns="http://www.w3.org/1999/xhtml" rel="nofollow" href="mailto:IR@deepfission.com" shape="rect">IR@deepfission.com</a><br xmlns="http://www.w3.org/1999/xhtml"></br>(858) 794-9500</p><p xmlns="http://www.w3.org/1999/xhtml" class="bwalignl"> Elevate IR<br xmlns="http://www.w3.org/1999/xhtml"></br>(720) 330-2829</p><p xmlns="http://www.w3.org/1999/xhtml" class="bwalignl"><br xmlns="http://www.w3.org/1999/xhtml"></br></p>

Deep Fission priced its IPO at $16 per share, raising $40 million and granting a 30-day greenshoe. The shares will trade on Nasdaq Global Market under FISN, with an expected start June 18, 2026 and close June 22. Proceeds will fund engineering, R&D, licensing, and the construction of its first Gravity Nuclear Reactor pilot in Parsons, Kansas, and support DOE Reactor Pilot Program activities.

Advanced Nuclear Company Deep Fission Announces Pricing of Public Offering of Common Stock

AI Summary

Sentiment Rationale

Trading Thesis

Market-Moving

Key Facts

Companies Mentioned

Corporate Developments

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