Tech stocks started out with broad losses Thursday, with digital sport-camera maker GoPro Inc. among the decliners. GoPro shares fell more than 7%, to $73.45, after the company said late Wednesday that it priced a secondary stock offering of more than 10 million shares at $75 a piece. Losses also came from Ambarella Inc. , which supplies video-capturing chips for GoPro cameras, and Salesforce.com Inc. , which fell almost 4%, to $58.71 a share after the company forecast disappointing sales growth on Wednesday. The Nasdaq Composite Index , which includes many leading tech stocks, shed 15 points to 4,660.
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