Sec Form 4 Filing - Burns Thomas William @ GLAUKOS Corp - 2023-07-03

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 Burns Thomas William 2. Issuer Name and Ticker or Trading Symbol GLAUKOS Corp [ GKOS] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) CHAIRMAN & CEO (Last) (First) (Middle) C/O GLAUKOS CORPORATION, ONE GLAUKOS WAY 3. Date of Earliest Transaction (MM/DD/YY) 07/03/2023 (Street) ALISO VIEJO, CA92656 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 07/03/2023 M 26,400 A $ 7.275 700,363 ( 1 ) D Common Stock 07/03/2023 S( 2 ) 22,570 D $ 69.38 ( 3 ) 677,793 ( 1 ) D Common Stock 07/03/2023 S( 2 ) 3,830 D $ 70.27 ( 4 ) 673,963 ( 1 ) D Common Stock 07/05/2023 M 5,027 A $ 7.275 678,990 ( 1 ) D Common Stock 07/05/2023 S( 2 ) 5,027 D $ 70.02 ( 5 ) 673,963 ( 1 ) 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 Executio n 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 Stock Option (Right to Buy) $ 7.275 07/03/2023 M( 2 ) 26,400 ( 6 ) 07/10/2024 Common Stock 26,400 $ 0 418,600 D Stock Option (Right to Buy) $ 7.275 07/05/2023 M( 2 ) 5,027 ( 6 ) 07/10/2024 Common Stock 5,027 $ 0 413,573 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Burns Thomas William C/O GLAUKOS CORPORATION ONE GLAUKOS WAY ALISO VIEJO, CA92656 X CHAIRMAN & CEO Signatures Diana Scherer, Attorney-in-Fact 07/06/2023 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Includes 55,926 restricted stock units that have not yet vested or been delivered to the Reporting Person. ( 2 )This trade was made pursuant to a Rule 10b5-1 trading plan with pre-determined share amounts and prices, with respect to stock options that expire in 2024. ( 3 )This transaction was executed in multiple trades at prices ranging from $68.865 to $69.86. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. ( 4 )This transaction was executed in multiple trades at prices ranging from $69.865 to $70.835. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. ( 5 )This transaction was executed in multiple trades at prices ranging from $70.00 to $70.08. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. ( 6 )This option was granted on July 10, 2014 and had a four-year vesting schedule in which 25% vested on the first anniversary of the grant date and the remainder vested in equal monthly installments for 36 months thereafter, such that the stock option vested in full on the four-year anniversary of the grant date.

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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