X-Energy, the Rockville, Maryland-based developer of small modular nuclear reactors and advanced nuclear fuel, began trading on the Nasdaq on Friday under the ticker symbol XE, opening at $30.11 against an IPO price of $23 per share, a 31% immediate premium that reflected the extraordinary investor appetite for the deal.
The stock subsequently climbed as high as $31.33 before closing at $29.20, up 27% over the IPO price, with the company valued at $11.5 billion at close of trade. The offering itself was oversubscribed by a factor of 15 times, an indication that institutional demand for nuclear energy exposure has reached a level that would have seemed implausible even two years ago.
The fundraise represents a landmark moment for the advanced nuclear sector. X-Energy raised $1.02 billion in total gross proceeds after upsizing its offer from an initial target of around $800 million, selling 44.3 million shares at $23 each against a marketed range of $16 to $19.
The decision to price above the range and still open significantly higher suggests that even the revised expectations underestimated the depth of investor demand. X-Energy CEO Clay Sell said in an interview: “This is a validation of our nuclear technology.” The listing was led by JPMorgan Chase, Morgan Stanley, Jefferies, and Moelis.
Crucially, X-Energy is the first advanced nuclear reactor company of meaningful scale to pursue a traditional IPO route, with competitors Oklo and NuScale having opted for SPAC transactions when they went public. That distinction matters commercially: a traditional IPO signals a level of institutional scrutiny and underwriter confidence that a SPAC merger does not require, and it is likely to influence how debt markets and project finance lenders assess X-Energy’s future capital raises as it progresses toward its first reactor deployments in the 2030s. The company’s technology uses helium as a coolant rather than water, a design choice intended to improve safety margins and reduce construction complexity compared with conventional nuclear plants.
The broader context driving the deal is the intersection of AI-driven electricity demand and a renewed policy and investor focus on carbon-free baseload power. Data centres require vast amounts of uninterrupted electricity, and solar and wind generation cannot provide the on-demand reliability that hyperscalers need at scale. Nuclear, and small modular reactors in particular, are increasingly being positioned as the most credible long-term answer to that equation. Amazon, an X-Energy backer, has already committed to purchasing power from small modular reactors as part of its net-zero data centre strategy, providing the company with a commercially credible anchor customer that most nuclear startups lack.
The IPO pricing dynamic also tells a broader story about where capital is now flowing within the energy transition. While traditional renewable energy stocks have struggled with margin compression and supply chain costs, nuclear-adjacent companies have benefited from a narrative tailwind combining geopolitical energy security concerns, AI infrastructure growth, and a bipartisan US political consensus in favour of nuclear expansion. X-Energy’s debut, in that light, is less of a corporate event than a signal about what the next decade of energy investment could look like. Whether the company can translate that enthusiasm into operating reactors and revenue is the question that will take years rather than months to answer.