X-energy raises $1bn in record nuclear IPO, shares surge 27% on debut
Stock priced at $23, well above $16-$19 range, valuing the pre-revenue reactor firm at $11.9bn on Nasdaq
Briefing
- •X-energy raised more than $1 billion in what CNBC described as the largest nuclear public offering on record, pricing at $23 per share against an initial range of $16 to $19.
- •Shares opened at $30.11 and closed at $29.20, a 27% gain on the day, delivering paper profits to backers including Amazon, Citadel's Ken Griffin, ARK Invest, Jane Street and Ares Management.
- •The company's xe-100 is an 80-megawatt high-temperature gas-cooled reactor that can be scaled to 960 megawatts and used in industrial applications beyond power generation; X-energy licenses technology rather than owning or operating plants.
- •X-energy has no reactors under construction but claims an order pipeline exceeding 11 gigawatts, anchored by a deal with Amazon to deploy 5 gigawatts across the US by 2039, with the first 320-megawatt project planned with Washington utility Energy Northwest.
- •A construction permit application for a project with Dow in Seadrift, Texas was filed with the Nuclear Regulatory Commission in March 2025; the review is expected to take 18 months before an operating licence can be pursued.
- •X-energy is the first sizable advanced reactor company to pursue a traditional IPO after rivals Oklo and NuScale went public via SPAC; X-energy itself abandoned a SPAC merger plan in 2023.
Analysis
- →X-energy's IPO pricing 40% above the midpoint of its range, on zero operating reactors and an 18-month NRC review ahead, confirms that capital markets are pricing nuclear licensing optionality rather than cash flow. This creates a valuation reference point that compresses the discount rivals Oklo and NuScale trade at relative to their own pipelines, while simultaneously raising the bar for any subsequent advanced reactor IPO to clear without a named hyperscaler anchor deal of comparable scale.
- →Amazon's 5-gigawatt commitment to X-energy, anchoring more than 45% of the claimed order pipeline, means AMZN's cloud infrastructure buildout is now partially dependent on a technology that has no constructed reactors and faces an 18-month minimum NRC review for its first permitted project. If the Seadrift or Energy Northwest timelines slip, Amazon faces a power procurement gap in its data center expansion plan that pushes it back toward conventional generation or competing nuclear vendors, concentrating execution risk on a single supplier relationship.
- →X-energy's successful traditional IPO after abandoning its SPAC route in 2023 directly challenges the assumption that advanced nuclear companies must access public markets through SPAC structures due to pre-revenue risk profiles. The record deal size and 27% first-day gain provide an existence proof that institutional demand exists for licensed-technology nuclear models with hyperscaler offtake, which likely accelerates IPO planning at other pre-revenue clean energy and nuclear technology licensors currently sitting in private markets.
Historical Context
- 2023
X-energy abandoned its own SPAC merger with Ares Acquisition Corporation, citing market conditions. The company's pivot to a traditional IPO two years later, pricing above range with the same Ares Management now among its backers, illustrates how the nuclear sentiment cycle reversed as hyperscaler power demand became visible.
- Sept 2023
Amazon announced its initial investment in X-energy alongside a broader commitment to advanced nuclear power procurement. That anchor relationship, formalized into a 5-gigawatt offtake framework, is the direct commercial underpinning of X-energy's 11-gigawatt pipeline claim and the primary justification for institutional participation in the IPO.
- 2021-2023
NuScale and Oklo went public via SPAC, with NuScale subsequently cancelling its first commercial project at Idaho National Laboratory in late 2023 after utility cost estimates nearly tripled. That failure set the market prior that advanced reactor economics were unproven, making X-energy's traditional IPO and above-range pricing a direct rebuttal to that narrative.
Connected Events
Citadel threatens to halt $6bn NYC expansion after Mamdani pied-a-terre tax attack
Ken Griffin's Citadel is simultaneously an X-energy IPO backer and at the center of a standoff with New York City's mayor over a proposed pied-a-terre tax. Griffin's participation in the nuclear IPO alongside the NYC expansion threat illustrates the breadth of capital deployment Citadel is executing across asset classes even under political pressure.
Microsoft launches first-ever voluntary buyout targeting up to 7% of US workforce
Microsoft and Meta are each redirecting tens of billions in labor cost savings into AI infrastructure capex, intensifying hyperscaler demand for reliable behind-the-meter power at data center scale. X-energy's Amazon anchor deal is a direct downstream consequence of this capital reallocation cycle, as power procurement becomes a binding constraint on AI infrastructure expansion.
