The S&P; 500 fell 0.7% to 4,348.26 in midday trading.
The Dow was off 0.6% at 34,122.2.
The Nasdaq dropped 1.2% to 13,549.59.
Crude oil was down 0.3% to $91.50 a barrel.
Gold was off 0.2% at $1,899 an ounce.
The yield on a 10-year bond fell 2.48% to 1.9230.
Alteryx Inc. (NYSE: AYX) slid 7% to $54.77 per share and a $3.7 billion market cap. The Irvine-based data analytics software maker gave back some of its gains from earlier in the week after its fourth-quarter results surpassed predictions by analysts.
Romeo Power Inc. (NYSE: RMO) fell 6% to $2.02 per share and a $271 million market cap. Shares of the Cypress-based EV battery manufacturer have still been down about 86% from its 52-week high.