As online ad retargeting becomes more ubiquitous, retargeting startup AdRoll says it's growing quickly. The company wasn't willing to reveal exact revenue numbers, but it did share some statistics about its growth. AdRoll says it saw revenue grow 414 percent, while ad impressions served increased 400 percent. The company says it tripled the number of advertisers that it's working with 2,193 new accounts added for a total of 3,500. And it's profitable.


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