than a point at 2,966.75.
Major indexes ended last week with gains of 3 to 4 percent, with the Dow above 13,000 and the S&P above 1,400 for the first time since Nov. 6.
Shares of Knight Capital Group Inc jumped 17.7 percent to $2.93 following reports that rivals might be preparing to bid for part or all of the electronic trading firm.
Apple Inc has asked a federal court to add six more products to its patent infringement lawsuit against Samsung Electronics, including the Samsung Galaxy Note II, in the latest move in an ongoing legal war between the two companies. Apple shares were up 2.8 percent at $587.37.