Shares of UnitedHealth took a historic tumble Thursday after the U.S.’ largest health insurer fell far short of Wall Street’s estimates in its quarterly earnings report, dragging down the blue chip Dow Jones Industrial Average with it.

Stocks are swinging sharply still after President Trump’s tariff announcement last week. Here’s how last week stacks up to some of the worst days for the stock market in U.S. history.

A steep slide in UnitedHealth Group shares was dragging on the Dow Jones Industrial Average on Thursday, putting the blue-chip index on track for historical underperformance versus the S&P 500.