SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

(Amendment No. )

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☐	Preliminary Proxy Statement
☐	Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))
☐	Definitive Proxy Statement
☒	Definitive Additional Materials
☐	Soliciting Material Pursuant to §240.14a-12

ENPHASE ENERGY, INC.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement if Other Than the Registrant)

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*** Exercise Your Right to Vote *** Important Notice Regarding the Availability of Proxy Materials for the Stockholder Meeting to Be Held on May 17, 2018
		Meeting Information
	ENPHASE ENERGY, INC.	Meeting Type: Annual Meeting
		For holders as of: March 23, 2018
		Date: May 17, 2018        Time: 9:00 AM PDT Location: Enphase Energy, Inc.            1420 N. McDowell Blvd            Petaluma, CA 94954
		You are receiving this communication because you hold shares in the above named company. This is not a ballot. You cannot use this notice to vote these shares. This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. You may view the proxy materials online at www.proxyvote.com or easily request a paper copy (see reverse side). We encourage you to access and review all of the important information contained in the proxy materials before voting.
		See the reverse side of this notice to obtain proxy materials and voting instructions.

	— Before You Vote — How to Access the Proxy Materials
	Proxy Materials Available to VIEW or RECEIVE:
	1. Notice & Proxy Statement      2. Form 10-K
	How to View Online:
	Have the information that is printed in the box marked by the arrow (located on the following page) and visit: www.proxyvote.com.
	How to Request and Receive a PAPER or E-MAIL Copy:
	If you want to receive a paper or e-mail copy of these documents, you must request one. There is NO charge for requesting a copy. Please choose one of the following methods to make your request:
	1) BY INTERNET:	www.proxyvote.com
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	Vote In Person: Many stockholder meetings have attendance requirements including, but not limited to, the possession of an attendance ticket issued by the entity holding the meeting. Please check the meeting materials for any special requirements for meeting attendance. At the meeting, you will need to request a ballot to vote these shares.
	Vote By Internet: To vote now by Internet, go to www.proxyvote.com. Have the information that is printed in the box marked by the arrow available and follow the instructions. Vote By Mail: You can vote by mail by requesting a paper copy of the materials, which will include a proxy card.		Internal Use    Only

	Voting items
	The Board of Directors recommends you vote FOR the following:
	1.	To elect one nominee for director named below to hold office as a member of the Board of Directors until the 2021 annual meeting of the stockholders.
		Nominees
	01	Badri Kothandaraman
	The Board of Directors recommends you vote FOR the following proposal:		5   To ratify the selection by the Audit Committee of the Board of Directors of Deloitte & Touche LLP as our independent registered public accounting firm for the fiscal year ending December 31, 2018.
	2	To approve, on an advisory basis, the compensation of the Company’s named executive officers.
	The Board of Directors recommends you vote 1 YEAR on the following proposal:		NOTE: Such other business as may properly come before the meeting or any adjournment thereof.
	3	To indicate, on an advisory basis, the preferred frequency of holding future advisory votes on executive compensation of the Company’s named executive officers.
	The Board of Directors recommends you vote FOR proposals 4 and 5.
	4	To approve an amendment to the Company’s Amended and Restated Certificate of Incorporation to increase the number of authorized shares of common stock to 150,000,000.

Reserved for Broadridge Internal Control Information 

NAME
THE COMPANY NAME INC. - COMMON	123,456,789,012.12345
THE COMPANY NAME INC. - CLASS A	123,456,789,012.12345
THE COMPANY NAME INC. - CLASS B	123,456,789,012.12345
THE COMPANY NAME INC. - CLASS C	123,456,789,012.12345
THE COMPANY NAME INC. - CLASS D	123,456,789,012.12345
THE COMPANY NAME INC. - CLASS E	123,456,789,012.12345
THE COMPANY NAME INC. - CLASS F	123,456,789,012.12345
THE COMPANY NAME INC. - 401 K	123,456,789,012.12345