Elon Musk’s artificial-intelligence startup, xAI, has told investors it raised $5 billion in a funding round valuing it at $50 billion—more than twice what it was valued at several months ago ...

The Federal Bureau of Investigation seized the phone of the founder and chief executive of Polymarket, the crypto-based prediction market that was a popular platform for bets on the U.S ...

Unlimited access to WSJ.com on desktop, tablet & mobile Mobile and tablet apps, including What's News - the app that delivers the day's most important stories straight to your iPhone Informative ...