The Dow Jones industrial average was up 11.27 points, or 0.08 percent, at 13,984.66. The Standard & Poor's 500 Index was up 0.32 points, or 0.02 percent, at 1,521.70. The Nasdaq Composite Index was up 1.51 points, or 0.05 percent, at 3,200.17.
For the week, both the Dow and Nasdaq fell 0.1 percent while the S&P rose 0.1 percent in its seventh straight week of gains, a period during which the index rose 8.4 percent. The last such seven-week run was between December 2010 and January 2011.
The New York Federal Reserve said manufacturing in New York state expanded for the first time in seven months, while Thomson Reuters/University of Michigan's preliminary reading of consumer sentiment rose from the prior month and beat expectations.
But U.S. manufacturing fell in January after a rise in the prior month.
Wall Street's gain thus far in 2013 has largely been driven by strong corporate earnings, while data indicated some weakening in economic conditions.
A surge in merger and acquisition activity, with more than $158 billion in deals announced so far in 2013, has given further support to the equity market as it points to healthy valuations and bets on the economic outlook.
Herbalife shares cut earlier gains to rise 1.2 percent to $38.74. Late Thursday, billionaire investor Carl Icahn said in a regulatory filing that he now owns 13 percent of Herbalife and was ready to put it in play.
MeadWestvaco Corp climbed 12.5 percent to $35.65 as the biggest percentage gainer on the S&P index after activist investor Nelson Peltz's Trian Fund Management LP said it had bought about 1.6 million shares of the packaging company.
Burger King Worldwide shares gained 4.7 percent to $17.36 after it beat estimates with a 94 percent rise in fourth-quarter profit, thanks to new menu additions.
Oil service stocks declined, weighed by a 5.1 percent drop in shares of Transocean to $56.26, after the rig contractor reported its fleet update and Deutsche Bank cut its rating on the stock to "sell." The PHLX oil service sector lost 1.5 percent.
Slightly more stocks fell than rose on the New York Stock Exchange while about 50