X-Energy debuts at $9.1B as nuclear returns to public markets
What’s the deal? X-Energy raised $1.02B in its initial public offering on 23 April 2026, pricing above the marketed range in an upsized offering that reflects strong investor demand. The company debuted on the Nasdaq under the ticker XE on 24 April at a market capitalisation of $9.1B. It is the largest public market debut by an advanced nuclear company to date.
Why now? Electricity demand from AI data centres, manufacturing reshoring, and electrification has made reliable, carbon-free baseload power one of the most commercially urgent infrastructure problems in the US. Nuclear — specifically small modular reactors (SMRs) — is drawing renewed interest as a solution.
Amazon led X-Energy’s $500M Series C-1 in 2024 and has committed to purchasing up to 5 gigawatts of nuclear power from the company by 2039 — roughly the output of five large conventional nuclear plants. That anchor commitment functions as both revenue guarantee and technology validation. The IPO crowns more than $1.8B in prior private capital.
X-Energy’s core technology is the Xe-100, a pebble bed modular reactor that uses helium as a coolant and uranium-coated fuel spheres instead of conventional fuel rods. The design provides inherent safety properties: the reaction slows naturally if the reactor overheats, without active cooling. The company also manufactures its own advanced nuclear fuel, reducing supply chain dependency. X-Energy reported $94M in revenue (excluding grants) in 2025, up from $84M the year before, alongside a net loss of roughly $390M.
What could go wrong? SMR technology remains unproven at commercial scale. X-Energy’s Xe-100 is still in pre-application review with the US Nuclear Regulatory CommissionDealroom has a profile for this one. Try Dealroom →, and the company aims to make its first delivery by the early 2030s. The path from IPO proceeds to actual power generation involves years of regulatory approvals, construction, and testing.
X-Energy previously planned to go public through a SPAC merger backed by Ares ManagementDealroom has a profile for this one. Try Dealroom → in 2023, but scrapped those plans citing unfavourable market conditions. Founder and chairman Kam GhaffarianDealroom has a profile for this one. Try Dealroom → retains control of 61% of Class B shares, giving him voting control despite the public float. Ares Management affiliates hold 26%.
The signal: The oversubscription and above-range pricing tell a clear story: public market investors are willing to pay a premium for nuclear exposure tied to AI infrastructure demand. The nuclear renaissance narrative has moved from venture capital pitch decks to institutional portfolios.
X-Energy was founded in 2009, raised its first significant capital in 2023, and is now public — a 17-year journey that reflects the capital intensity and regulatory complexity of nuclear energy. The company has agreements in place with DowDealroom has a profile for this one. Try Dealroom →, Amazon, and CentricaDealroom has a profile for this one. Try Dealroom → to deploy its reactors.
Sources:
X-Energy
Reuters
Bloomberg
The Next Web
Financial Post
Washington Business Journal
Image credit:
X-Energy
J.V.
