Amazon-Backed Nuclear Firm X-Energy Raises $1.02 Billion in IPO

X-Energy Inc., a nuclear energy firm that counts Amazon.com Inc. as a backer, raised $1.02 billion in an upsized US initial public offering that priced above the marketed range.

The Rockville, Maryland-based company sold 44.3 million shares for $23 each, according to a statement Thursday. X-Energy had marketed the shares for $16 to $19 each.

At the IPO price, the company has a market value of $9.1 billion based on the outstanding shares listed in its filings.

X-Energy designs small modular nuclear reactors and makes advanced nuclear fuel. Its reactors use so-called Triso pebbles, or tristructural isotropic, poppyseed-sized uranium ...