Closing Bell: Marcato Takes Stake in Buffalo Wild Wings; U.S. Stocks Slip

Investors kept a wary eye on plummeting crude oil prices to begin the week, pushing equities to retreat from record levels achieved last Friday. Crude settled at a three-month low on concerns over refinery activity and demand. The energy sector was the worst performer on markets. Major oilers Chevron (CVX) - Get Report , Exxon Mobil (XOM) - Get Report , BP (BP) - Get Report and Royal Dutch Shell  (RDS.A) each ended the session lower. Buffalo Wild Wings (BWLD) spiked in afternoon trade after disclosing that Marcato Capital Management had taken a new stake worth 5.1 percent. That makes Marcato the fourth-largest shareholder of the wings chain. Sprint (S) - Get Report surged to new highs on growth in subscribers in its recent quarter. The telecom reported its lowest ever postpaid phone churn and added postpaid subs for its fourth straight quarter. TheStreet's Keris Lahiff reports from Wall Street.