Additional Proxy Soliciting Materials (definitive) (defa14a)

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the
Securities Exchange Act of 1934

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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 Under §240.14a-12

GLAUKOS CORPORATION
(Name of Registrant as Specified In Its Charter)

	Not applicable
	(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 31, 2018. GLAUKOS CORPORATION  (located on the following page). GLAUKOS CORPORATION 229 AVENIDA FABRICANTE SAN CLEMENTE, CA 92672 You are receiving this communication because you hold shares in the company named above. 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. proxy materials and voting instructions. E45482-P04421 See the reverse side of this notice to obtain Meeting Information Meeting Type: Annual Meeting For holders as of: April 5, 2018 Date: May 31, 2018 Time: 9:00 AM, Pacific Time Location: Meeting live via the Internet-please visit www.virtualshareholdermeeting.com/GKOS2018. The company will be hosting the meeting live via the Internet this year. To attend the meeting via the Internet please visit www.virtualshareholdermeeting.com/GKOS2018 and be sure to have the information that is printed in the box marked by the arrow XXXX XXXX XXXX XXXX

Before You Vote How to Access the Proxy Materials Have the information that is printed in the box marked by the arrow  XXXX XXXX XXXX XXXX (located on the by the arrow  XXXX XXXX XXXX XXXX (located on the following page) in the subject line. How To Vote Please Choose One of the Following Voting Methods  XXXX XXXX XXXX XXXX (located on the following page) available and follow the instructions. the arrow  XXXX XXXX XXXX XXXX (located on the following page) available and follow the instructions. E45483-P04421 Vote By Internet: Before The Meeting: Go to www.proxyvote.com. Have the information that is printed in the box marked by the arrow During The Meeting: Go to www.virtualshareholdermeeting.com/GKOS2018. Have the information that is printed in the box marked by Vote By Mail: You can vote by mail by requesting a paper copy of the materials, which will include a proxy card. Proxy Materials Available to VIEW or RECEIVE: NOTICE AND PROXY STATEMENT2017 ANNUAL REPORT ON FORM 10-K How to View Online: 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 2) BY TELEPHONE:1-800-579-1639 3) BY E-MAIL*:sendmaterial@proxyvote.com * If requesting materials by e-mail, please send a blank e-mail with the information that is printed in the box marked Requests, instructions and other inquiries sent to this e-mail address will NOT be forwarded to your investment advisor. Please make the request as instructed above on or before May 17, 2018 to facilitate timely delivery.

The Board of Directors recommends you vote FOR ALL the following: 1. Election of Directors Nominees: 01) 02) 03) Thomas W. Burns Gilbert H. Kliman, M.D. Marc A. Stapley The Board of Directors recommends you vote FOR proposal 2. 2. Approval, on an advisory basis, of the compensation of the Company's named executive officers. The Board of Directors recommends you vote 1 YEAR on proposal 3: 3. Approval, on an advisory basis, of the frequency of future advisory votes on executive compensation. The Board of Directors recommends you vote FOR proposal 4: 4. Ratification of the appointment of Ernst & Young LLP as the Company’s independent registered public accounting firm for the year ending December 31, 2018. NOTE: In their discretion, the proxies are authorized to vote upon such other business as may properly come before the meeting and any adjournment or postponement thereof. E45484-P04421 Voting Items