The tech-heavy Nasdaq-100 index is down by more than 10% from the all-time high it set last month, but it was down by as much as 13% earlier in March. A broad sell-off swept the U.S. stock market as historically high valuations ran up against rising fears and uncertainties about tariffs,

Drops for Nvidia, Tesla and other former superstars dragged Wall Street lower. The S&P 500 fell 1.1% Wednesday.