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Employee Benefit Plan
9 Months Ended
Sep. 30, 2015
Postemployment Benefits [Abstract]  
Employee Benefit Plan
Note 18. Employee Benefit Plan

Effective January 1, 2015, Zillow Group established a defined contribution 401(k) retirement plan covering employees who have met certain eligibility requirements (“the Zillow Group 401(k) Plan”). In addition, in connection with our February 2015 acquisition of Trulia, we adopted a defined contribution 401(k) retirement plan that covers Trulia and Market Leader employees who have met certain eligibility requirements (“the Trulia 401(k) Plan”). Eligible employees under each of the plans may contribute pretax compensation up to a maximum amount allowable under the Internal Revenue Service limitations. Employee contributions and earnings thereon vest immediately. We currently match up to 1.5% of employee contributions under the Zillow Group 401(k) Plan and up to 4% of employee contributions under the Trulia 401(k) Plan. The total expense related to defined contribution 401(k) retirement plans was $1.0 million and $3.1 million, respectively, for the three and nine month periods ended September 30, 2015. We did not have any expense related to defined contribution 401(k) retirement plans for the three or nine month periods ended September 30, 2014.