What began as a banner day for stocks turned into a major rout, as investors signaled ongoing skepticism about the longevity of the artificial intelligence boom and trimmed hopes of support from the Federal Reserve. The tech-heavy Nasdaq…

Bitcoin and ether slumped to multi-month lows on Friday, with cryptocurrencies swept up in a broader flight from riskier assets as investors worried about lofty tech valuations and bets on near-term U.S. interest rate cuts faded. Bitcoin, the…