Sec Form 4 Filing - Gilliam Joseph E @ GLAUKOS Corp - 2020-12-16

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Gilliam Joseph E 2. Issuer Name and Ticker or Trading Symbol GLAUKOS Corp [ GKOS] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) CFO, SVP Corporate Development (Last) (First) (Middle) C/O GLAUKOS CORPORATION,, 229 AVENIDA FABRICANT 3. Date of Earliest Transaction (MM/DD/YY) 12/16/2020 (Street) SAN CLEMENTE, CA92672 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 12/16/2020 A 3,182 ( 1 ) A $ 71.94 43,707 ( 2 ) D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Gilliam Joseph E C/O GLAUKOS CORPORATION, 229 AVENIDA FABRICANT SAN CLEMENTE, CA92672 CFO, SVP Corporate Development Signatures /s/ Diana Scherer, Attorney-in-Fact 12/18/2020 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Represents shares of common stock subject to a performance-based restricted stock unit award previously granted by the Issuer on March 14, 2019, the vesting of which was subject to the Issuer's achievement of certain performance goals within three years of the grant date. The Compensation Committee of the Issuer's Board of Directors determined on December 16, 2020 that the performance goals had been achieved. The number of shares of common stock reported consists of the 6,311 shares underlying the restricted stock units originally granted less 3,129 shares withheld by the Issuer with respect to income taxes payable by the Reporting Person upon the vesting and delivery of the shares of common stock underlying these restricted stock units. The number of common stock reported also includes 459 shares that were acquired by the Reporting Person in July 2020 pursuant to the Issuer's Employee Stock Purchase Plan. ( 2 )Includes 20,056 restricted stock units that have not yet vested or been delivered to the Reporting Person.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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