Energy stocks took a broad dive Monday, as crude oil prices sold off amid concerns that the recent surge in new COVID-19 cases globally would sap demand. The SPDR Energy Select Sector ETF /zigman2/quotes/206420077/composite XLE -2.96% slumped 3.0%, and was the biggest decliner among SPDR ETFs tracking the S&P 500's /zigman2/quotes/210599714/realtime SPX -1.31% 11 key sectors, with all 25 equity components losing ground. Apache Corp.'s stock /zigman2/quotes/200648444/composite APA -2.27% was the ETF's (XLE) biggest decliner, as it dropped 6.3% toward a 6-month low. Among other more active XLE components, shares of Marathon Oil Corp. /zigman2/quotes/205031829/composite MRO -2.48% slid 5.3%, Occidental Petroleum Corp. /zigman2/quotes/207018272/composite OXY -0.82% shed 4.2%, Exxon Mobil Corp. /zigman2/quotes/204455864/composite XOM -2.56% slid 2.8%, Halliburton Co. /zigman2/quotes/210488727/composite HAL -3.21% declined 3.2% and Schlumberger NV /zigman2/quotes/201012972/composite SLB -3.63% gave up 3.2%. Meanwhile, crude oil futures /zigman2/quotes/209723049/delayed CL00 -0.20% fell 3.3% to a 3-week low.