Oklo , a publicly traded small-modular-reactor firm backed by OpenAI chief Sam Altman, has become one of the highest-profile companies working on next-generation nuclear energy technologies. Two years ago, it debuted on the stock market and became retail investors’ go-to for betting on America’s atomic renaissance. …

Valar Atomics, the three-year-old microreactor developer that has a forged a close relationship with the Trump administration, has raised $1 billion in its Series B funding round as investors increasingly bet that the White House’s overhaul of nuclear regulations will clear the way for the country’s first big atomic…