The S&P 500 fell 0.4% to 4,206.92 in midday trading.
The Dow Jones Industrial Average slumped 0.9% to 33,745.48, while the Nasdaq was up 0.5% to 14,105.03.
Crude oil declined 2.8% to $70.16.
Gold was down 4.8% to $1,771.70.
The yield on a 10-year Treasury fell 5.7% to 1.479%.
Irvine-based cannabis software maker WM Technology Inc. (Nasdaq: MAPS) fell 3.9% to $19.75 a share and a $616 million market cap. The company, previously known as Weedmaps, saw shares rise as much as 9.1% on Wednesday on its first day of trading following a merger with special purpose acquisition company Silver Spike Acquisition Corp.
OC restaurants were harder hit than the general market on Thursday. The slump was led by Irvine-based Kura Sushi USA Inc. (Nasdaq: KRUS), which declined 4.6% to $35.10 and a $295 million market cap. Huntington Beach-based BJ’s Restaurants Inc. (Nasdaq: BJRI) fell 3.7% to $48.15 a share and a $1.1 billion market cap. Del Taco Restaurants Inc. (Nasdaq: TACO) of Lake Forest was down 3.9% to $10.10 a share and a $371 million market cap.