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.

US stock futures traded flat on the heels of a bruising day on Wall Street that underscored fears over the economic impact of President Trump's tariffs.

Fed Chair Powell warned of a slowing economy and higher inflation but said the central bank isn't ready to cut rates just yet.