US stocks lost momentum to finish mostly lower Monday as crude-oil futures returned to bear-market territory and weaker-than-expected manufacturing data raised doubts about the strength of the economy. 
The S&P 500 SPX shed 2.76 points, or 0.1%, to close at 2,170.84. 
The Dow Jones Industrial Average DJIA fell 27.73 points, or 0.2%, to close at 18,404.51. 
However, the Nasdaq Composite Index COMP climbed 22.06 points, or 0.4%, to end at 5,184.20.