Amazon-Backed X-Energy Surges 27% in Record $1.02 B Nuclear IPO Debut

X-Energy priced 44.4 million shares at $23 each, $4 above the top of its marketed range, to raise a final $1.02 billion. The stock opened at $27.75 and closed at $29.21, a 27% gain that valued the company near $5 billion. Order books were 15 times oversubscribed, according to IPOScoop, allowing underwriters led by Goldman Sachs and Morgan Stanley to upsize the deal twice. The float represents roughly 20% of total shares, pricing X-Energy at about 12× projected 2027 revenue.

Amazon's Climate Pledge Fund first invested in X-Energy's Series C-2 round in 2021 and now holds an 8.4% post-IPO position worth roughly $400 million. The e-commerce giant pre-committed to purchasing power from four planned reactors at its Virginia data-center campus, locking in carbon-free electricity for AWS expansion. No other cloud hyperscaler has taken a direct equity stake in a next-gen nuclear developer, giving Amazon a first-mover hedge against grid bottlenecks.

The IPO lands amid a U.S. policy swing: the 2022 Inflation Reduction Act grants new reactors a 30% investment tax credit plus $30/MWh production credit, while the 2023 ADVANCE Act fast-tracks licensing. Utilities facing AI-driven load growth forecasts of 3-4% annually through 2030 are scrambling for firm, zero-carbon power. X-Energy’s Xe-100 high-temperature gas reactor design is the first advanced reactor to reach Phase 3 review with the NRC, positioning it ahead of TerraPower and Oklo in the regulatory queue.

X-Energy’s exit delivers a 3.8× money-on-money return to early backers including Andreessen Horowitz, DCVC and Founders Fund. The strong aftermarket pop signals renewed risk appetite for hard-tech IPOs after a two-year drought. VC partners told TechFundingNews that the deal will "unlock" a pipeline of fusion and fission startups eyeing 2026 listings. Clean-tech funds closed $12 billion in new capital during Q1 2026, the highest quarterly haul since 2021, partly on expectations the X-Energy playbook can be repeated.

The company must still secure a combined construction and operating license (COL) for its first demonstration plant in Washington state, now under NRC review and not expected before late 2027. Each 80-MWe Xe-100 module costs an estimated $2,500/kW installed, cheaper than Vogtle-scale AP1000s but still unproven at commercial scale. Fuel supply hinges on a domestic HALEU enrichment chain that doesn’t yet exist; Centrus’s Ohio pilot plant won’t reach 900 kg/year until 2028. Any slippage in licensing or fuel supply would compress the 2029 revenue ramp baked into the current valuation.

At $29 per share, X-Energy trades at 11.8× 2027 consensus revenue of $430 million versus 6.5× for legacy utilities. Analysts at Morgan Stanley cite the premium as justified by a contracted pipeline of 1.2 GW across Amazon, Dow and Southern Company. Options volume hit 220,000 contracts on debut, skewing 3:1 call-to-put, indicating retail enthusiasm. Short interest is already building through convertible bond arbitrage desks betting the first plant won’t enter service before 2031.

The raise vaults X-Energy past Oklo’s SPAC valuation and gives it a deeper cash reserve than TerraPower’s $750 million Series E last year. The fresh capital lets X-Energy accelerate a second manufacturing line for its TRISO fuel pebbles, doubling planned output to 600,000 elements per year. Rivals now face a higher cost of capital: venture rounds for advanced reactor startups are pricing 15-20% higher in the weeks since the IPO, according to PitchBook data.

Management guided to site selection for a second U.S. plant by Q4 2026 and a final investment decision on a UK export facility in 2027. With cash burn running $120 million annually, the IPO proceeds give roughly eight years of runway even without revenue. Investors will watch three near-term catalysts: NRC approval of the Xe-100 design certification (expected Q2 2027), Amazon’s start of construction at its Virginia data-center reactor site, and any Department of Energy loan guarantee announcement that could de-risk future builds.