Marvell Technology tops fourth-quarter earnings estimates but the stock tumbles as in-line guidance disappoints investors, Broadcom slumps ahead of the release of quarterly earnings, and MongoDB falls sharply on a weaker-than-expected fiscal-year outlook.

Key Takeaways U.S. equities dipped at midday as confusion over the new tariffs by President Donald Trump led to market uncertainty.Artificial intelligence chip shares tumbled following Marvell Technology's results.

U.S. stocks extended declines as markets reacted to ongoing tariff tensions and relief measures. The S&P 500 and Nasdaq 100 slide 1.3% and 1.8%, respectively, while the Dow Jones Industrial Average dropped 0.