By Titik Puspa 
San Francisco, CA | October 13-15, 2026 – Nuclear startup X-energy is charting a course for its public debut, initiating its investor roadshow this Wednesday with a targeted share price range of $16 to $19. This move, detailed in filings with the U.S. Securities and Exchange Commission, signals a significant step towards an Initial Public Offering (IPO) that could potentially net the company approximately $814 million if it achieves the higher end of its valuation. The ambitious undertaking arrives at a pivotal moment for the nuclear energy sector, which is experiencing a resurgence of interest fueled by escalating electricity demands, particularly from burgeoning AI data centers and the broader societal shift towards electrification.
X-energy, a prominent player in the advanced nuclear reactor space, is poised to capitalize on this renewed enthusiasm. The company’s strategic vision and technological advancements have garnered substantial support, most notably from tech behemoth Amazon. The e-commerce and cloud computing giant has been a significant investor, leading a substantial $500 million Series C-1 funding round. Beyond its financial commitment, Amazon has also made a forward-looking pledge to procure up to 5 gigawatts of nuclear power from X-energy by 2039, underscoring the growing confidence in the startup’s ability to deliver on its promises. This substantial off-take agreement not only provides X-energy with a crucial revenue stream but also serves as a powerful validation of its small modular reactor (SMR) technology.
The impending IPO offers a welcome prospect for X-energy’s existing investors, who have collectively injected approximately $1.8 billion into the company, according to data from PitchBook. This latest attempt at going public follows a previous, ultimately unsuccessful, bid through a reverse merger with a special purpose acquisition company (SPAC). In October 2023, X-energy mutually terminated a $2 billion deal with Ares Acquisition Corporation, a move attributed to the waning "SPAC craze" that had seen a surge in popularity but ultimately proved unsustainable for many ventures. The cancellation highlighted the inherent challenges and market volatility associated with SPACs, making the traditional IPO route a potentially more stable and predictable path for X-energy.
At the heart of X-energy’s technological innovation lies its proprietary high-temperature, gas-cooled reactor design. This advanced reactor utilizes a unique fuel form known as TRISO (Tristructural-Isotropic), where uranium is encapsulated within multiple layers of ceramic and carbon spheres. These fuel particles are then cooled by helium gas, which subsequently transfers heat to a steam turbine loop to generate electricity. The TRISO fuel design is engineered for enhanced safety, boasting a higher melting point and greater resistance to fission product release compared to traditional fuel arrangements. While this advanced fuel technology offers significant safety advantages, its widespread adoption in the industry is still in its nascent stages, presenting both an opportunity and a challenge for X-energy as it seeks to scale its operations.
However, the path to commercialization is not without its hurdles. X-energy disclosed in its SEC filing that it is currently involved in a patent dispute with Ultra Safe Nuclear Corporation (USNC), another company in the advanced nuclear space that recently declared bankruptcy. USNC’s assets were acquired out of bankruptcy proceedings to form a new entity, Standard Nuclear. X-energy alleges that USNC infringed upon its patents related to fuel fabrication, and this matter remains unresolved to X-energy’s satisfaction following the bankruptcy proceedings. Such legal entanglements can cast a shadow over a company’s prospects, particularly as it seeks to attract public investment, and investors will be closely scrutinizing the potential impact of this dispute.
The global landscape for new nuclear reactor development, outside of China, has been largely characterized by stagnation. Decades of delays, cost overruns, and complex regulatory frameworks have hampered the construction of traditional, large-scale nuclear power plants. In response, a new generation of startups, including X-energy, is focusing on developing smaller, more modular reactors. The underlying premise is that by reducing the physical footprint and simplifying the construction process, these SMRs can overcome the historical challenges that have plagued the nuclear industry, making nuclear power a more viable and scalable energy source for the future.
Several of these SMR startups are engaged in a race to meet an ambitious deadline set by the Trump administration – July 4th – to demonstrate the viability of their technologies. While the exact nature and impact of this deadline remain somewhat fluid, the broader objective is to accelerate the deployment of advanced nuclear power. Even if some companies miss arbitrary timelines, the pursuit itself is driving innovation and pushing the industry forward. The critical milestone for any new reactor design is achieving "criticality," the point at which fission reactions become self-sustaining. This marks a significant technological achievement, but it is only the first step on a long and complex journey.
The transition from achieving criticality to operating profitable power plants is likely to be an arduous one. Mass manufacturing is widely recognized as the key to driving down costs in the SMR sector. However, realizing the full economic benefits of mass production typically takes around a decade, a substantial timeframe for investors to wait for returns. Furthermore, the number of reactors that these companies are planning to build, while ambitious compared to historical efforts, may not yet be sufficient to unlock the true economies of scale associated with mass manufacturing. The economic viability of SMRs will heavily depend on the ability to achieve significant cost reductions through standardization and serial production.
X-energy itself anticipates that by the time its reactor production techniques mature, reaching what experts term "Nth-of-a-kind" production, it will be able to achieve cost reductions of approximately 30% compared to the initial "first-of-a-kind" units. This projected cost reduction is a critical factor that investors will be keenly observing. The actual cost of constructing and operating that very first reactor will be a crucial determinant of X-energy’s long-term prospects. A successful and cost-effective initial deployment could pave the way for widespread adoption, while a costly or problematic first-of-a-kind project could significantly hinder the company’s growth trajectory and investor confidence.
The renewed interest in nuclear power, driven by the urgent need for clean, reliable energy sources to meet the demands of a rapidly digitizing world, positions companies like X-energy at the forefront of a potential energy revolution. The success of X-energy’s IPO will not only impact its own future but will also serve as a barometer for the broader SMR industry and its capacity to contribute to a decarbonized global energy landscape. The coming months will be critical as X-energy navigates its roadshow, engages with potential investors, and ultimately aims to translate its technological promise into a publicly traded reality, marking a significant chapter in the ongoing narrative of advanced nuclear energy.
About the Author:
Tim De Chant is a senior climate reporter at TechCrunch. He has a distinguished career in science journalism, having contributed to publications such as Wired magazine, the Chicago Tribune, Ars Technica, The Wire China, and NOVA Next, where he served as founding editor. De Chant also holds a lecturing position in MIT’s Graduate Program in Science Writing. His academic background includes a Knight Science Journalism Fellowship at MIT, where he delved into climate technologies and journalism business models. He earned his PhD in environmental science, policy, and management from the University of California, Berkeley, and a BA in environmental studies, English, and biology from St. Olaf College. He can be reached at [email protected].