Filed by Taylor Morrison Home Corporation

Pursuant to Rule 425 under the Securities Act of 1933

and deemed filed pursuant to Rule 14a-12

under the Securities Exchange Act of 1934

Subject Company: William Lyon Homes

(Commission File No. 001-31625)

To: William Lyon Staff
From: Sheryl

Subject line: Holiday Wishes Before the Decade’s Over

Dear William Lyon team members,

The clock is ticking and, before we know it, 2019 and an entire decade will be a thing of the past. Before we close the chapter on an amazing year, I wanted to extend my holiday wishes to the William Lyon family.

During our time together at the roadshows I shared a holiday-inspired clip from 2018 showcasing our annual Build Joy program, where we give team members $1,000 to Build Joy in their communities on behalf of Taylor Morrison. Based on the feedback from so many of you and in celebration of the holidays upon us, I wanted to share the highlight reel from our 11 ‘Joy Builders’ this season. The spirit and heart shown by our Taylor Morrison team members never ceases to amaze me, and this video gives me all the feels and I hope it brings a smile to your face today, too. (If you want to see all of the individual acts of kindness, I invite you to view them here.

Looking ahead to 2020—January will bring with it a ton of great work. We’ve shared that the closing of the acquisition was a bit of a moving target between late Q1 and early Q2. As it turns out, the process has moved quicker than we imagined it would. We are now planning to hold the necessary meetings for both William Lyon and Taylor Morrison stockholders to approve the deal on Jan. 30, 2020, and—following those stockholder approvals—we expect to be in a position to close the transaction in early February.

These are exciting times, but with that feeling of excitement I know comes a sense of apprehension. We still have so many key decisions to make in an expedited timeframe—but we want to reassure everyone who has yet to hear about their role in the future combined business that we need all of our tremendous talent and won’t make any changes through February, and that we will move as quickly as possible early in the new year to confirm the go-forward structure. Be on the lookout for a video message from me early in January that outlines some next steps in our integration planning.

The future for our combined company as we enter the ‘20s’ is so bright. Together, we will grow our business in ways we never have before—with even more team members, more beautiful communities to create, more cherished homes to build, and more lives to impact with our loving spirit.

From my family to yours, I wish you a joyous holiday and a very happy new year.

Warmly,

Sheryl

Forward-Looking Statements

Some of the statements in this communication are forward-looking statements (or forward-looking information) within the meaning of applicable U.S. securities laws. These include statements using the words “believe,” “target,” “outlook,” “may,” “will,” “should,” “could,” “estimate,” “continue,” “expect,” “intend,” “plan,” “predict,” “potential,” “project,” “intend,” “estimate,” “aim,” “on track,” “target,” “opportunity,” “tentative,” “positioning,” “designed,” “create,” “seek,” “would,” “upside,” “increases,” “goal,” “guidance” and “anticipate,” and similar statements and the negative of such words and phrases, which do not describe the present or provide information about the past. There is no guarantee that the expected events or expected results will actually occur. Such statements reflect the current views of management of Taylor Morrison Home Corporation, a Delaware corporation (“Taylor Morrison”), or William Lyon Homes, a Delaware corporation (“William Lyon Homes”), and are subject to a number of risks and uncertainties. These statements are based on many assumptions and factors, including general economic and market conditions, industry conditions, operational and other factors. Any changes in these assumptions or other factors could cause actual results to differ materially from current expectations. All forward-looking statements attributable to William Lyon Homes or Taylor Morrison or persons acting on their behalf, and are expressly qualified in their entirety by the cautionary statements set forth in this paragraph. Undue reliance should not be placed on such statements. In addition, material risks and uncertainties that could cause actual results to differ from forward-looking statements include, among other things: the inherent uncertainty associated with financial or other projections, including anticipated synergies; the integration of Taylor Morrison and William Lyon Homes and the ability to recognize the anticipated benefits from the combination of Taylor Morrison and William Lyon Homes, and the amount of time it may take to realize those benefits, if at all; the risks associated with Taylor Morrison’s and William Lyon Homes’ ability to satisfy the conditions to closing the consummation of the merger, including obtaining the requisite stockholder approvals, and the timing of the closing of the merger; the failure of the merger to close for any other reason; the outcome of any legal proceedings that may be instituted against the parties and others related to the merger; any unanticipated difficulties or expenditures relating to the merger; the effect of the announcement and pendency of the merger on the respective business relationships or operating results of Taylor Morrison, William Lyon Homes, or the combined company; risks relating to the value of the Taylor Morrison common stock to be issued in connection with the merger, and the value of the combined company’s common stock after the merger is consummated; the anticipated size of the markets and continued demand for Taylor Morrison’s and William Lyon Homes’ homes and the impact of competitive responses to the announcement and pendency of the merger; the diversion of attention of management of Taylor Morrison or William Lyon Homes from ongoing business concerns during the pendency of the merger; and the access to available financing on a timely basis, and the terms of any such financing. Additional risks and uncertainties are described in Taylor Morrison’s and William Lyon Homes’ respective filings with the U.S. Securities and Exchange Commission (the “SEC”), including as described under the heading “Risk Factors” in Taylor Morrison’s Annual Report on Form 10-K for the year ended December 31, 2018, filed with the SEC on February 20, 2019, in William Lyon Homes’ Annual Report on Form 10-K for the year ended December 31, 2018 filed with the SEC on February 28, 2019, and in their respective subsequent Quarterly Reports on Form 10-Q. Forward-looking statements speak only as of the date they are made. Except as required by law, neither Taylor Morrison nor William Lyon Homes has any intention or obligation to update or to publicly announce the results of any revisions to any of the forward-looking statements to reflect actual results, future events or developments, changes in assumptions or changes in other factors affecting the forward-looking statements.

Important Additional Information and Where to Find it

This communication is not intended to and does not constitute an offer to sell or the solicitation of an offer to subscribe for or buy or an invitation to purchase or subscribe for any securities or the solicitation of any vote or approval in any jurisdiction, nor shall there be any sale, issuance or transfer of securities in any jurisdiction in contravention of applicable law. In connection with the proposed merger between Taylor Morrison and William Lyon Homes, Taylor Morrison has filed with the SEC a registration statement on Form S-4 that includes a joint proxy statement of Taylor Morrison and William Lyon Homes that also constitutes a prospectus of Taylor Morrison (the “Joint Proxy Statement/Prospectus”). Taylor Morrison and William Lyon Homes plan to mail to their respective shareholders the definitive Joint Proxy Statement/Prospectus in connection with the merger. INVESTORS AND SECURITY HOLDERS OF TAYLOR MORRISON AND WILLIAM LYON HOMES ARE URGED TO READ THE JOINT PROXY STATEMENT/PROSPECTUS AND OTHER RELEVANT DOCUMENTS FILED OR TO BE FILED WITH THE SEC CAREFULLY WHEN IT BECOMES AVAILABLE BECAUSE IT WILL CONTAIN IMPORTANT INFORMATION ABOUT TAYLOR MORRISON, WILLIAM LYON HOMES, THE MERGER AND RELATED MATTERS. Investors and security holders will be able to obtain free copies of the Joint Proxy Statement/Prospectus and other documents filed with the SEC by Taylor Morrison and William Lyon Homes through the website maintained by the SEC at www.sec.gov. In addition, investors and security holders will be able to obtain free copies of the documents filed with the SEC by Taylor Morrison in the Investor Relations section of Taylor Morrison’s website at http://investors.taylormorrison.com or by contacting Taylor Morrison’s Investor Relations at investor@taylormorrison.com or by calling (480) 734-2060, and will be able to obtain free copies of the documents filed with the SEC by William Lyon Homes in the Investor Relations section of William Lyon Homes’ website at www.lyonhomes.com or by contacting William Lyon Homes’ Investor Relations at WLH@finprofiles.com or by calling (310) 622-8223.

Participants in the Merger Solicitation

Taylor Morrison, William Lyon Homes and certain of their respective directors, executive officers and employees may be considered participants in the solicitation of proxies in connection with the proposed merger. Information regarding the persons who may, under the rules of the SEC, be deemed participants in the solicitation of the shareholders of Taylor Morrison and William Lyon Homes in connection with the merger, including a description of their respective direct or indirect interests, by security holdings or otherwise, is included in the Joint Proxy Statement/Prospectus described above. Additional information regarding Taylor Morrison’s directors and executive officers is also included in Taylor Morrison’s proxy statement for its 2019 Annual Meeting of Shareholders, which was filed with the SEC on April 16, 2019, and information regarding William Lyon Homes’ directors and executive officers is also included in William Lyon Homes’ proxy statement for its 2019 Annual Meeting of Stockholders, which was filed with the SEC on March 29, 2019. These documents are available free of charge as described above.