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Nielsen said it will sell more stock in a secondary...

Nielsen said it will sell more stock in a secondary offering of 25 million shares. Separately, it said it’s developing a cross-platform audience measurement service with GroupM. “Our advertiser clients increasingly recognize that traditional television advertising and online video advertising…

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must work together,” said Rino Scanzoni, GroupM’s chief investment officer. “It’s vital that we have consistent measurement and that’s our goal in working with Nielsen."