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    If you’re looking for a new home in the U.S., chances are you’re using Zillow. The online real estate group—which includes brands like HotPads and Street­Easy—accounts for nearly two-thirds of the total online real estate category, and the term “Zillow” is now searched more frequently than “real estate” in the U.S. The Seattle company has been on a buying spree of its own, with the $3.5 billion ­purchase of rival Trulia in 2014, the headliner among 13 acquisitions in six years. To keep its edge, Zillow wants to sharpen its ­marquee Zestimate algorithm, which tracks home values. The company recently offered a $1 million Zillow Prize to data scientists for the best tweak.

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    Company Information

    Overall Score3.6
    Internet Services and Retailing
    Spencer M. Rascoff
    HQ Location
    Seattle, Wash.
    Revenues ($M) (Past 12 Months)$965
    Profits ($M) (Past 12 Months)$-43
    Market Value as of Oct. 9, 2017 ($M)$7,733