By Victor Reklaitis, MarketWatch

NEW YORK (MarketWatch) -- U.S. stocks dropped on Thursday, with strategists attributing the move to investors taking profits after a strong run for equities that has the S&P 500 and the Dow industrials right below record highs.

"The backdrop still remains fairly good, but it's just people taking some chips off the table," said Scott Wallace, founder and chief investment officer at Ranger Asset Management and previously a portfolio manager at AllianceBernstein.

The S&P 500 index (SPX) was down 10 points, or 0.6%, to 1,760, after rising initially and eyeing a new record close. It's up more than 23% for the year.

The Dow Jones Industrial Average (DJI) lost 48 points, or 0.3%, to 15,699.

The Nasdaq Composite(RIXF) fell 49 points, or 1.2%, to 3,883.

Stocks erased opening gains that came early Thursday following a surprise interest-rate cut in Europe and a better-than-expected estimate on U.S. economic growth. The S&P 500 and Dow both had been on pace for fresh record closes before turning lower.

Investors also watched shares in Twitter Inc.(TWTR) soar during their first day of trading on the New York Stock Exchange.

Chris Bertelsen, chief investment officer at wealth manager Global Financial Private Capital, downplayed the market's choppy action on Thursday.

"It's probably a bit of back and fill for a market that's had a good run," Bertelsen said. He also noted that Qualcomm Inc.'s(QCOM) 4% drop after its quarterly report weighed on the Nasdaq.

Ranger's Wallace noted that winning stocks such as Facebook Inc. (FB) and energy play EOG Resources Inc.(EOG) have seen selling in the last week or two even after strong quarterly earnings reports. He suggested many investors want to lock in gains because they remember the financial crisis and remain worried about their profits evaporating.

Investors are thinking "let me protect my gains, harvest some gains and go home," Wallace said. He expects stocks to finish 2013 at around their current levels or slightly higher.

Other strategists attributed the selling to the better-than-expected report on U.S. economic growth, arguing that may help the Federal Reserve decide to taper its bond-buying program that's boosted equities. The U.S. Commerce Department said third-quarter GDP increased 2.8%, beating forecasts for a rise of 2.3%. Weekly jobless claims came in at 336,000, roughly in line with expectations of 335,000.

Before the U.S. stock market opened, the European Central Bank cut its benchmark interest rate by quarter of a percentage point to a record low 0.25%. U.S. stock futures jumped on that move, then largely maintained their gains after the reports on U.S. economic growth and jobless claims.

The euro (EURUSD) dropped sharply after the ECB rate cut. European stocks rose on the cut, but now have followed U.S. stocks lower.

Asian stocks fell, with a drop for Toyota Motor Corp. (TM) weighing on Japan's index after the auto maker posted disappointing results.

Oil prices and gold prices declined, while the dollar rose.

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