U.S. Stocks Fall on Iran Tensions; Nasdaq Drops 1.55%, WTI Surges 9.42% on July 13

On July 13, U.S. stock indices fell sharply as geopolitical tensions escalated. The Nasdaq declined 1.55%, S&P 500 dropped 0.79%, and Dow Jones fell 0.26%. The decline followed President Trump's announcement to reinstate a maritime blockade on Iran and impose a 20% tariff on vessels transiting the Strait of Hormuz, reviving regional supply concerns.

WTI crude oil surged 9.42% to $78.14 per barrel, posting its largest daily gain since April. The U.S. 10-year Treasury yield rose 4.30 basis points to 4.61%, and the dollar index climbed 0.31% to 101.279.