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[$$] Stocks to Watch: Dropbox, Nike, Tronc, Qualcomm, Puma Biotechnology, Invitation Homes, Universal Display

Here are some of the companies with shares expected to trade actively in Friday’s session. Stock movements reflect premarket trading. Dropbox Inc.—Down 8.9%: The company’s chief operating officer is departing, which apparently unnerved investors despite its second-quarter revenue and earnings topping expectations.