Stocks are ending mostly higher after shaking off an early loss.
Starwood Hotels jumped 5 percent Monday after agreeing to a new offer to be acquired by Marriott International.
Valeant Pharmaceutical rose 7 percent after its CEO stepped down. Activist investor Bill Ackman will join the troubled company's board.
Homebuilders lost ground on news that home sales fell last month.
The Dow Jones industrial average edged up 21 points, or 0.1 percent, to 17,624.
The Standard & Poor's 500 index rose two points, or 0.1 percent, to 2,051. The Nasdaq composite climbed 13 points, or 0.3 percent, to 4,808.
Bond prices fell. The yield on the 10-year Treasury note rose to 1.92 percent.