But some on Wall Street caution that big sector stocks will have a tougher time continuing their upward momentum from here amid sector stocks' run-up and expectations that the U.S. economy will only improve slowly. While media biggies extended their run-up in the opening quarter of 2010 with gains ranging from the 6.8% for News Corp. to 32.1% for Sony Corp. (excluding CBS' 0.8% decline), the broader-based S&P 500 stock index edged up only 4.9%. Disney remained the Hollywood powerhouse with the biggest market capitalization at $67.7 billion.
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