Sec Form 4 Filing - Gilliam Joseph E @ GLAUKOS Corp - 2020-12-17

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 FABRICANTE 3. Date of Earliest Transaction (MM/DD/YY) 12/17/2020 (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 ( 1 ) 12/17/2020 A 1,164 A $ 72.99 44,871 ( 2 ) D Common Stock 12/17/2020 J( 3 )( 4 ) 2,069 D $ 0 42,802 ( 5 ) 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 FABRICANTE SAN CLEMENTE, CA92672 CFO, SVP Corporate Development Signatures /s/ Diana Scherer, Attorney-in-Fact 12/21/2020 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Granted by the Issuer in the form of restricted stock units which vest over a three-year period, with one-third to vest on each anniversary of the grant date. ( 2 )Includes 21,220 restricted stock units that have not yet vested or been delivered to the Reporting Person. ( 3 )In order to comply with the terms of a domestic relations order ("DRO") in connection with a marital dissolution, the Reporting Person's former spouse now holds the economic interest, and the Reporting Person no longer has any pecuniary interest, in the following securities: (i) 1,956 shares of common stock of the Issuer and (2) 113 restricted stock units that have not yet vested or been delivered to the Reporting Person, which were reported above as directly owned by the Reporting Person. While the Reporting Person retains possession of the common stock and restricted stock units until they are sold in connection with the DRO, the Reporting Person's former spouse will receive the economic benefits from, and the Reporting Person will have no discretion with respect to, such securities. (Continued in footnote 4) ( 4 )Accordingly, the Reporting Person will not report beneficial ownership or dispositions of these securities (including restricted stock units) in future Section 16(a) reports, including to the extent such securities are sold pursuant to a Rule 10b5-1 trading plan that may be adopted by the Reporting Person that includes these securities. Likewise, the number of shares of common stock of the Issuer that may be reported as withheld to satisfy tax obligations in Table 1 will not include the shares withheld with respect to the portion of the restricted stock units representing the former spouse's economic interest. ( 5 )Includes 21,107 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).

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