The S&P 500 was down 0.7% to 3,685.06.
The Dow Jones was flat at 30,168.80 while the Nasdaq fell 0.6% to 12,682.60.
Crude oil dropped 4% to $47.13.
Gold dipped 0.1% to $1,886.50.
The yield on a 10-year Treasury decreased 1.6% to 0.93%.
Newport Beach-based Clean Energy Fuels Corp. (Nasdaq: CLNE) rose 7.6% to $5.92 and a $1.2 billion market cap. The company, which supplies renewable natural gas, announced new partnerships Monday including plans to develop, own and operate new renewable natural gas facilities along with BP Products North America. Shares are currently trading at about six times their average daily volume.
Shares of Lake Forest-based Del Taco Restaurants Inc. (Nasdaq: TACO) led gains among Orange County restaurants, rising 2.7% to $9.39 and a $349 million market cap. Shares for the restaurant operator have increased nearly 60% in the past six months.
BJ’s Restaurants, Inc. (Nasdaq: BJRI) also rose during Monday midday trading, increasing 3.2% to $36.91 and a $818 million market cap.