Two dozen venture capital firms and other investors are investing in xAI, the artificial intelligence and social media company.

As Mr. Musk steps away from Washington, he faces concerns over his prolonged absence from his businesses including Tesla, SpaceX, xAI and X.

The Federal Railroad Administration has brought in the tunneling company to help with a multibillion-dollar rail project.

Steve Davis, a longtime Musk loyalist, is effectively the leader of the Department of Government Efficiency. Mr. Musk has likened him to chemotherapy.

In an email to staff of the Consumer Financial Protection Bureau, the agency’s acting director ordered workers to cease “all supervision and examination activity.”

Mr. Musk has fallen out with prominent right-wing Americans who say they are worried that their agenda may be sidelined in favor of his own.

A fierce dispute erupted in the president-elect’s camp between immigration hard-liners and tech industry leaders including Elon Musk.

Mr. Musk dug into his companies’ budgets, preferring to cut too much rather than too little and to deal with the fallout later. Under Donald…

The billionaire has poured nearly $120 million into a pro-Trump voting effort and used his social media platform, X, to spread misinformation, despite public statements…

Their fast-evolving political friendship has become a potential minefield, as Mr. Musk’s sprawling businesses may present conflicts of interest if Mr. Trump is elected in…