Deep Fission, Inc. filed a Form 8-K with the SEC on September 21, 2026, disclosing a press release announcing its collaboration with Youngquist Brothers, LLC to evaluate and test drilling and borehole-construction methods for the company's underground reactor deployment model.

Key Highlights

  • Collaboration announced: Deep Fission, Inc. disclosed a collaboration with Youngquist Brothers, LLC focused on drilling and borehole-construction methods.
  • Purpose: The collaboration concerns evaluation and testing of methods for the company's underground reactor deployment model, according to the filing.
  • Disclosure date: The press release was issued on September 21, 2026.
  • Regulation FD: The disclosure was made under Item 7.01 (Regulation FD) and is furnished, not filed, for purposes of Section 18 of the Exchange Act.
  • Emerging growth company: Deep Fission, Inc. indicated it qualifies as an emerging growth company under applicable SEC rules.

Deep Fission Discloses Youngquist Brothers Drilling Partnership

Deep Fission, Inc. (NASDAQ:FISN), headquartered at 2001 Addison Street, Unit 300, Berkeley, California 94704, reported on September 21, 2026, that it issued a press release announcing a collaboration with Youngquist Brothers, LLC. According to the filing, the collaboration involves the evaluation and testing of drilling and borehole-construction methods in connection with the company's underground reactor deployment model.

The disclosure was made under Item 7.01 of Form 8-K, which covers Regulation FD disclosures. The filing notes that the information furnished under Item 7.01, including Exhibit 99.1 (the press release), "shall not be deemed 'filed' for purposes of Section 18 of the Securities Exchange Act of 1934, as amended," and is not subject to the liabilities of that section unless expressly incorporated by reference in another filing.

The Form 8-K was signed by Jon Gordon, General Counsel and Secretary of Deep Fission, Inc. The company's common stock, with a par value of $0.0001 per share, is listed on The Nasdaq Global Market under the trading symbol FISN. The company indicated it is an emerging growth company as defined under applicable securities rules, though it did not elect to use the extended transition period for complying with new or revised financial accounting standards.

What Was Disclosed

Deep Fission, Inc. furnished a Form 8-K on September 21, 2026, reporting a collaboration with Youngquist Brothers, LLC to evaluate and test drilling and borehole-construction methods for its underground reactor deployment model, with the underlying press release attached as Exhibit 99.1.