Stocks opened little changed on Thursday after data showed first time claims for jobless benefits fell sharply last week, but investors were cautious about making aggressive bets in the midst of ongoing "fiscal cliff" negotiations.
Shares of Best Buy Co surged almost 18 percent after a report that the company's founder is expected to make a fully financed offer to buy the consumer electronics retailer by the end of the week. Best Buy was up 17.9 percent at $14.36, making it the biggest gainer on the S&P 500.
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Other economic data on Thursday showed retail sales rose in November after an October decline, brightening the picture for consumer spending.
Still, equities gains were constrained as the set of tax hikes and spending cuts that are set to come into effect in the new year remained at the forefront of investors' minds. Negotiators on Wednesday warned the showdown over reaching a deal on the so-called fiscal cliff could drag on past Christmas.
"With the suggestion that they're not any closer than they were a few days ago, we're really just in a market that's trying to figure out what the next catalyst might be," said Kate Warne, investment strategist at Edward Jones in St Louis.
"I think we need to see either an actual plan or signs that they've worked out a way to be sure they don't end up disagreeing at the last minute. Either of those would be positive, but so far we're not seeing anything that suggests either one."
The Federal Reserve on Wednesday announced a fresh bout of stimulus for the U.S. economy, but markets focused on comments from Chairman Ben Bernanke, who reiterated that monetary policy would not be enough to offset going over the fiscal cliff.
Investors are worried that doing so could send the economy back into recession, though most expect a deal will be struck eventually.
The Dow Jones industrial average inched up 2.11 points, or 0.02 percent, at 13,247.56. The Standard & Poor's 500 Index edged down 0.56 point, or 0.04 percent, at 1,427.92. The Nasdaq Composite Index eased 2.51 points, or 0.08 percent, to 3,011.31.
If the S&P 500 ends the session lower, it would break a six-day winning streak. Some of those days saw only slight gains on lower volume.
In the European Union, finance ministers reached a deal to make the European Central Bank the bloc's top banking supervisor. The move could boost confidence in leaders' ability to tackle the region's sovereign debt crisis.
Initial claims for state unemployment benefits dropped 29,000 to a seasonally adjusted 343,000, pointing to healing in the labor market.
Separate reports released at the same time showed producer prices fell more than expected in November, while retail sales rebounded though not by as much as expected.
CVS Caremark Corp gained 3.4 percent to $49.16 after it said it expects higher earnings next year.
(Editing by Kenneth Barry)