UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

Date of Report (Date of Earliest Event Reported): August 16, 2013

ZILLOW, INC.

(Exact name of registrant as specified in its charter)

(206) 470-7000

(Registrant’s telephone number, including area code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

On August 16, 2013, Zillow, Inc., a Washington corporation (“Zillow”), NMD Interactive, Inc., d/b/a StreetEasy, a Delaware corporation (“StreetEasy”), Strawberry Acquisition, Inc., a Delaware corporation and wholly owned subsidiary of Zillow (“Merger Sub”), and Shareholder Representative Services LLC, acting as the stockholder representative, entered into an Agreement and Plan of Merger (the “Merger Agreement”) providing for the acquisition of StreetEasy by Zillow.

Under the terms and subject to the conditions of the Merger Agreement, Merger Sub will merge with and into StreetEasy, with StreetEasy remaining as the surviving company and a wholly owned subsidiary of Zillow (the “Merger”). The total Merger consideration payable to StreetEasy equity holders will be approximately $50 million in cash, less certain transaction expenses and as adjusted at closing based on StreetEasy’s net working capital, cash and debt. All vested options to purchase shares of StreetEasy’s common stock will be cancelled and, in settlement of such cancellation, the holders of such options will receive cash payments representing a portion of the Merger consideration as described in the Merger Agreement. A portion of the Merger consideration will be attributed to the substitution of certain unvested stock options of StreetEasy outstanding as of the closing for stock options to purchase shares of Zillow’s Class A common stock at an exchange ratio implied by the per share Merger consideration as described in the Merger Agreement. At the closing, $5 million of the Merger consideration otherwise payable to StreetEasy stockholders and holders of vested stock options will be deposited in a third-party escrow account to secure certain indemnification obligations of those equity holders.

The Merger Agreement contains customary representations, warranties and covenants of the parties as well as conditions to closing, including, among other things, StreetEasy stockholder approval, including approval by holders of at least 85% of Strawberry’s capital stock, receipt of third party consents, and absence of a material adverse effect on StreetEasy. The Merger is expected to close in the third quarter of 2013.

Promptly following execution of the Merger Agreement, certain stockholders of StreetEasy, who collectively hold sufficient shares to approve the Merger under Delaware law, executed written consents approving the Merger and adopting the Merger Agreement.

The foregoing description of the Merger and Merger Agreement does not purport to be complete and is qualified in its entirety by reference to the full text of the Merger Agreement, a copy of which is attached hereto as Exhibit 2.1 and is incorporated herein by reference.

A copy of the press release issued by Zillow on August 19, 2013 regarding the Merger is filed as Exhibit 99.1 hereto, and is incorporated herein by reference. The information in this Item 7.01 of Current Report on Form 8-K, as well as Exhibit 99.1, shall not be treated as “filed” for purposes of Section 18 of the Exchange Act, nor shall it be deemed incorporated by reference in any filing under the Securities Act.

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(d) Exhibits.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

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EXHIBIT INDEX

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