The S&P 500 is now more than 10 percent below its last record high — a line in the sand for investors worried about a sell-off gathering steam.

A 10% drop is a big enough deal that professional investors have a name for it — a “correction” — and the S&P 500’s 1.4% slide on Thursday sent the index to its first si

US stocks slid Thursday and the S&P 500 entered a correction, down 10% from its record high in February, as President Donald Trump threatened new tariffs on the European Union.

Tariff worries rattled Wall Street again Thursday, pushing the S&P 500 into a correction that left it at the lowest in six months.