Zillow is destined to go lower because the real estate Web site's shares are way overvalued at 19 times sales, plus it has growing insider sales, says Brad Lamensdorf, portfolio manager for the AdvisorShares Ranger Equity Bear ETF. Lamensdorf is also shorting athletic wear seller Lululemon because of its price multiple and strong competition from Under Armour. Finally, he is bearish on FactSet Research's stock due to a pricing threat from Bloomberg.

Disclosure: TheStreet's editorial policy prohibits staff editors and reporters from holding positions in any individual stocks.

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