U.S. stocks plunged at the opening bell Thursday after Trump rocked global markets by announcing tariffs on almost all ...

At Yahoo Finance, you get free stock quotes, up-to-date news, portfolio management resources, international market data, social interaction and mortgage rates that help you manage your financial life.

Several major U.S. equity indexes were on track for their worst session since September 2022 early Thursday as investors reacted to President Donald Trump's plan to dramatically expand U.S. tariffs.