SAN FRANCISCO – Shares of Pandora Media, Twitter and LinkedIn rose Monday ahead of the their quarterly reports later this week. Pandora was up 4% in early trades, while Twitter gained 2%. Both are scheduled to report on Wednesday. LinkedIn , which will report on Thursday, was up 2%. But the tech sector was weighed down by losses in shares of Microsoft Corp. , Intel Corp. and Yahoo Inc. , which were each down 1%. The Nasdaq Composite Index was off 20 points, or 0.5%, at 4,086. The Morgan Stanley High Tech 35 Index was up a fraction, but the Philadelaphia Semiconductor Index shed 0.4%.
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