Clothes retailer Express jumped $2.90, or 21 percent, to $16.45 after it said it had been approached about a takeover by Sycamore Partners, a New York-based private equity company. Sycamore already owns 9.9 percent of Express' stock.
"It seems like you have a deal almost every day," said John Fox, director of research at Fenimore Asset Management.
While the number of acquisitions completed this year is roughly the same as it was at this point last year, the value has surged. U.S. companies have closed deals worth $714 billion, up 47 percent from $485 billion over the same period last year, according to Dealogic.
The price of crude added modestly to gains from earlier in the week. Crude is rising because Iraq's insurgency threatens to disrupt exports from OPEC's No. 2 oil producer. On Friday, oil nudged up 38 cents, or 0.3 percent, to $106.81 a barrel after a jump of more than $2 the day before. For the week, oil has risen 4 percent.
If the turmoil in Iraq continues and oil prices climb high enough, U.S. growth in the second half of the year may fall short of current estimates, said David Lafferty, the chief market strategist for Natixis Global Asset Management.
In U.S. government bond trading, the yield on the 10-year note rose to 2.61 percent early Friday from 2.60 on Thursday. The yield on a bond rises when its price falls.