NEWS: Amazon-backed X-energy files to raise up to $800M in IPO

The company is setting a target price range of $16-$19/share. So far, investors have poured roughly $1.8B into X-energy to date, per PitchBook. Amazon, its biggest backer, led a $500M funding round and has pledged to purchase up to 5 GW of the startup's nuclear power by 2039.

The tech: X-energy's reactor is a high-temp gas-cooled design that uses TRISO fuel -- uranium placed in spheres of ceramic and carbon, cooled by helium gas. No SMR startup has actually built a power plant yet, but several are working toward a July 4 criticality deadline set by the White House.