Wall Street ended lower on Monday, falling out of lockstep with oil prices as energy and healthcare shares lost ground.
U.S. indexes gave up early gains despite a 3 percent rally in U.S. oil prices. Stocks and oil have been strongly correlated in recent months as crude prices tanked to decade lows, and their movements in opposite directions during the session was notable to investors.
Following gains last week, technical trading dominated the action as the S&P 500 fell below its 50-day moving average, a sign seen as bad for sentiment. The index broke above the average on Thursday for the first time this year.