U.S. stocks ended little changed on Monday, with the Dow Jones Industrial Average halting its longest win streak this year.

"The market is a little overbought, but it's had a pretty good run here. The market got a big support last week from Janet Yellen," said Bruce Bittles, chief investment strategist at RW Baird, referring to comments by the Federal Reserve chair, who downplayed concerns about asset-price bubbles and inflation.