Amazon-backed X-energy files to raise up to $800M in IPO

The first StrictlyVC of 2026 hits San Francisco. Tickets are going fast. Register now. Save up to $680 on your Disrupt 2026 pass. Ends 11:59 p.m. PT tonight. REGISTER NOW. TechCrunch Desktop Logo TechCrunch Mobile Logo LatestStartupsVentureAppleSecurityAIApps EventsPodcastsNewsletters SearchSubmit Site Search Toggle Mega Menu Toggle Topics Latest Amazon-backed X-energy files to raise up to $800M in IPO Tim De Chant 3:44 PM PDT · April 15, 2026 Nuclear startup X-energy began its investor roadshow Wednesday as it works toward its IPO, setting its target price between $16 and $19 per share, according to documents filed with the U.S. Securities and Exchange Commission. If it lists at the high end, the startup could net $814.3 million. X-energy and its peers have been riding a renewed wave of interest in fission power as demand for electricity has surged on the back of AI data centers and society-wide electrification.  Amazon is one of X-energy’s biggest backers. The tech giant led a $500 million Series C-1 round and has pledged to buy as much as 5 gigawatts of nuclear power from the company by 2039. The IPO is sure to come as a relief to X-energy’s investors, which have put about $1.8 billion into the company, according to PitchBook. The startup had previously attempted to go public via reverse merger with a special purpose acquisition company, but the two parties canceled the deal in 2023 as the SPAC craze petered out. X-energy’s reactor is what’s known as a high-temperature, gas-cooled reactor. Inside, uranium encased in spheres of ceramic and carbon is cooled by helium gas. The gas then transfers heat to a steam turbine loop to generate electricity. The fuel design, known as TRISO, is expected to be safer than previous fuel arrangements, though it’s not widely used today. The startup said in its SEC filing that it’s already embroiled in a patent dispute with another company that recently went bankrupt. Ultra Safe Nuclear Corporation (USNC) went bankrupt in 2024, and its assets were purchased in bankruptcy to form Standard Nuclear. X-energy alleges that USNC infringed on its fuel fabrication patents and that the matter hasn’t been resolved to its satisfaction during the course of the bankruptcy proceedings. Outside of China, development of new nuclear reactors has all but stalled, stymied by delays and cost overruns. A new breed of startups hopes that by shrinking reactors, they’ll be able to overcome some of the challenges that have beset traditional designs. Techcrunch event Meet your next investor or portfolio startup at Disrupt Your next round. Your next hire. Your next breakout opportunity. Find it at TechCrunch Disrupt 2026, where 10,000+ founders, investors, and tech leaders gather for three days of 250+ tactical sessions, powerful introductions, and market-defining innovation. Register now to save up to $410. Meet your next investor or portfolio startup at Disrupt Your next round. Your next hire. Your next breakout opportunity. Find it at TechCrunch Disrupt 2026, where 10,000+ founders, investors, and tech leaders gather for three days of 250+ tactical sessions, powerful introductions, and market-defining innovation. Register now to save up to $410. San Francisco, CA | October 13-15, 2026 REGISTER NOW None of the small modular reactor startups have built a power plant yet, though several are racing to meet a deadline of July 4 set by the Trump administration. While many might miss the arbitrary deadline, they’re still likely to achieve criticality, the moment when fission reactions become self-sustaining. But the road from criticality to profitable power plants is likely to be long. Mass manufacturing can help bring costs down, but it usually takes around a decade for the process to start paying dividends. What’s more, the number of reactors these companies are planning to build might be more than other companies have attempted, but it might not be high enough to reap the true benefits of mass manufacturing. X-energy expects that by the time its reactor production techniques are mature — what experts call “Nth-of-a-kind” — it will be able to bring costs down by 30% relative to the first-of-a-kind. Investors should pay close attention to how much that first reactor costs. It could make or break the company’s prospects. Tim De Chant Senior Reporter, Climate Tim De Chant is a senior climate reporter at TechCrunch. He has written for a wide range of publications, including Wired magazine, the Chicago Tribune, Ars Technica, The Wire China, and NOVA Next, where he was founding editor. De Chant is also a lecturer in MIT’s Graduate Program in Science Writing, and he was awarded a Knight Science Journalism Fellowship at MIT in 2018, during which time he studied climate technologies and explored new business models for journalism. He received his PhD in environmental science, policy, and management from the University of California, Berkeley, and his BA degree in environmental studies, English, and biology from St. Olaf College. You can contact or verify outreach from Tim by emailing tim.dechant@techcrunch.com. April 30 San Francisco, CA StrictlyVC kicks off the year in SF. Get in the room for unfiltered fireside chats with industry leaders, insider VC insights, and high-value connections that actually move the needle. Tickets are limited. 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