Standard Nuclear filed Amendment No. 1 to its Form S-1 on July 7, 2026, offering 18,250,000 shares of Class A common stock at $18.00 to $21.00 per share on the New York Stock Exchange under the ticker STDN (S-1/A cover). At the $19.50 midpoint that is a $356 million gross offering.

The company was incorporated in Delaware on July 15, 2024 and commenced operations on January 13, 2025 (S-1/A Prospectus Summary). It manufactures TRISO fuel for advanced nuclear reactors including HTGRs, small modular reactors, and microreactors. Its technical assets came from a Section 363 bankruptcy auction of Ultra Safe Nuclear Corporation in late 2024, and its Chief Executive Officer, Dr. Kurt Terrani, was Ultra Safe's interim CEO at the time of that bankruptcy (S-1/A Management).

The origin story

Standard Nuclear established operations at the K-25 Site in Oak Ridge, Tennessee, the location of the world's first large-scale uranium enrichment, and commenced operations on January 13, 2025 (S-1/A Prospectus Summary).

Its technical foundation came from a Section 363 bankruptcy auction in late 2024, in which Standard Nuclear purchased nuclear-fuel-related assets from Ultra Safe Nuclear Corporation (S-1/A Selected Terms).

Standard Nuclear currently operates the Oak Ridge SN-0 facility. It is completing construction on Oak Ridge SN-TN and Idaho SN-ID (both anticipated online in the second half of 2026) and expects a fourth facility in 2027 through Standard Nuclear × Framatome LLC, a joint venture at Framatome's NRC-licensed Richland, Washington fuel cycle facility, following NRC approval in June 2026 of Framatome's license amendment request to allow TRISO fuel manufacturing at the Richland site (S-1/A Business).

The people running it

Dr. Kurt Terrani, CEO since January 2025. Ph.D. in nuclear engineering from UC Berkeley (2010), B.S. from Arizona State. Worked at Ultra Safe Nuclear Corporation from February 2021 to January 2025 as Executive Vice President, including as interim CEO from July 2024 to January 2025, the period leading into the bankruptcy sale in which Standard Nuclear acquired USNC's fuel assets (S-1/A Management). Previously spent more than a decade at Oak Ridge National Laboratory, most recently as a Senior Staff Scientist, and served as a National Technical Director for the U.S. DOE Office of Nuclear Energy.

Kevin Harrill, CFO since March 2026. Previously CFO of Centrus Energy Corp. (NYSE American: LEU), a public nuclear fuel supply chain company, from August 2023 to August 2025 (S-1/A Management).

Thomas Hendrix, Founder and Executive Chairman. Incorporated Standard Nuclear in July 2024 and has served as board chair since then; appointed Executive Chairman in June 2026 (S-1/A Management). Founding member of Decisive Point Group, LLC, a venture capital firm, and previously worked at Blackstone. Former Green Beret with multiple combat deployments; served nearly 10 years in the U.S. Army as an Infantry and Special Forces Officer. West Point undergraduate, MBA from Columbia Business School.

Two independent directors were added recently. Donald Moul joined the board in July 2026, immediately after serving as President and CEO of the Tennessee Valley Authority from April 2025 to July 2026, and previously as Chief Nuclear Officer at NextEra Energy (S-1/A Management). A. Scott Miller joined in June 2026 after retiring as a four-star U.S. Army general; per the filing he was the "longest serving and final commander" of the war in Afghanistan and earlier commanded the Task Force Ranger assault force during the 1993 "Blackhawk Down" operation in Mogadishu (S-1/A Management).

By the numbers

  • Revenue: $3.14 million (FY2025), zero (July 15 to December 31, 2024). Q1 2026: $593,802, up from $377,926 in Q1 2025. FY2025 cost of goods sold was $7.67 million on that revenue (S-1/A Summary Financial Data).
  • Net loss: $(15.54) million (FY2025), $(56.60) million (inception to December 31, 2024). Q1 2026: $(7.71) million (S-1/A).
  • Cash and equivalents: $124.9 million as of March 31, 2026, decreasing between then and the preliminary estimate as of June 30, 2026 (S-1/A Balance Sheet). Accumulated deficit as of March 31, 2026: $79.9 million.
  • Total contract backlog: up to $245 million. Qualified pipeline: an additional $986 million in "potential prospective fuel order opportunities" that "represent non-binding indications of interest" (S-1/A Business).
  • Serviceable addressable market: management estimates $3.2 billion cumulatively through 2030 (S-1/A Business).
  • Revenue mix FY2025: 65.2% fuel development agreements, 34.8% U.S. government R&D projects (S-1/A MD&A).

What could break

Never sold at industrial scale. Per the S-1/A: "we have never sold our products at large-scale commercial levels, and the production of TRISO fuel is generally untested at industrial scale ... leaving us with limited visibility into the prices our customers are willing to pay for our products" (S-1/A Prospectus Summary).

Customer dependency on HALEU access. Standard Nuclear does not procure enriched uranium; customers deliver feedstock, including High-Assay Low-Enriched Uranium (HALEU), for conversion. If customers cannot obtain HALEU from third-party suppliers, production halts (S-1/A Prospectus Summary).

Successor liability from the Ultra Safe assets. The S-1/A discloses that despite acquiring the Ultra Safe assets "free and clear," the company could remain responsible for regulatory, environmental, decommissioning, or land-use obligations, and could face challenges to the auction sale price on grounds it "was not 'reasonably equivalent value'" (S-1/A Risk Factors).

The offering

  • Shares offered: 18,250,000 Class A common stock, plus a 2,737,500-share over-allotment (S-1/A cover).
  • Price range: $18.00 to $21.00 per share; midpoint $19.50. Gross offering at midpoint: $356 million.
  • Dual-class structure: Class A carries one vote per share; Class B carries 20 votes per share. Founder Thomas Hendrix will beneficially own approximately 59.5% of the voting power after the offering (59.1% if the over-allotment is exercised in full) (S-1/A cover). Standard Nuclear will qualify as a "controlled company" under NYSE rules and will forgo certain independence requirements.
  • Use of proceeds: "working capital and other general corporate purposes," with a portion potentially used to acquire or invest in complementary businesses, products, services, technologies, or assets (S-1/A Use of Proceeds).
  • Underwriters: BofA Securities (left lead), Goldman Sachs, Barclays, UBS, Evercore ISI, RBC, William Blair, and Stifel (S-1/A cover).

What to watch

  • 180-day lock-up expiration: the company, directors, executive officers, and other existing security holders are subject to a 180-day lock-up from the date of the prospectus, waivable by BofA Securities and Goldman Sachs (S-1/A).
  • Second-half 2026 facility milestones: the Oak Ridge SN-TN and Idaho SN-ID facilities are anticipated to come online in the second half of 2026, both subject to DOE readiness reviews (S-1/A Business).
  • 2027 Framatome JV operations: Standard Nuclear × Framatome LLC plans to commence TRISO manufacturing at Richland in 2027 (S-1/A Business).
  • 40 MTU aggregate run-rate target: management targets up to 40 metric tons of uranium per year of TRISO production capacity "no earlier than 2030" (S-1/A Business).

Sources

Not financial advice.