UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K/A

(Amendment No. 3)

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d)

OF THE SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): December 22, 2015

WILLIAM LYON HOMES

(Exact name of registrant as specified in charter)

4695 MacArthur Court, 8^th Floor

Newport Beach, California 92660

(Address of principal executive offices and zip code)

(949) 833-3600

(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 obligations of the registrant under any of the following provisions:

INTRODUCTORY NOTE

On August 13, 2014, William Lyon Homes, a Delaware corporation (“Parent”), filed with the Securities and Exchange Commission a Current Report on Form 8-K (the “Original Form 8-K”) reporting, among other events, the completion of its acquisition (the “Acquisition”) of the residential homebuilding business of PNW Home Builders, L.L.C. (“PNW Parent”) pursuant to the Purchase and Sale Agreement (the “Purchase Agreement”), dated June 22, 2014, among William Lyon Homes, Inc., a California corporation and wholly owned subsidiary of Parent (“California Lyon”), PNW Parent, PNW Home Builders North, L.L.C., PNW Home Builders South, L.L.C. and Crescent Ventures, L.L.C. Prior to such completion, California Lyon assigned its interests in the Purchase Agreement to Polygon WLH LLC, a newly formed Delaware limited liability company for purposes of the Acquisition and wholly owned subsidiary of California Lyon (“Polygon WLH”). Pursuant to the Purchase Agreement, Polygon WLH acquired, for cash, the residential homebuilding business of PNW Parent through its acquisition of the membership interests of the underlying limited liability companies and certain service companies and other assets. On September 16, 2014, Parent filed a Current Report on Form 8-K/A (the “First Amendment”) which amended the Original Form 8-K to include an updated Item 9.01(a) Financial Statements of Business Acquired and Item 9.01(b) Pro Forma Financial Information. On December 5, 2014, Parent filed a Current Report on Form 8-K/A (the “Second Amendment”) which amended the First Amendment to include updated Item 9.01(b) Pro Forma Financial Information. This Amendment No. 3 on Form 8-K/A (this “Third Amendment”) amends the Second Amendment to include updated Item 9.01(b) Pro Forma Financial Information.

Item 9.01. Financial Statements and Exhibits.

The unaudited pro forma condensed combined statement of operations for the year ended December 31, 2014 and the related notes thereto, of Parent after giving effect to the Acquisition, are filed as Exhibit 99.1 to this Third Amendment and are incorporated by reference herein.

SIGNATURES

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

Date: December 22, 2015

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