Glaukos (NYSE: GKOS) CEO discloses tax-withholding share transaction

Rhea-AI Filing Summary

Glaukos Corporation’s Chairman, CEO and director reported an insider stock transaction dated 12/30/2025. The filing shows that 1,098 shares of common stock were withheld by the company to satisfy the reporting person’s tax withholding obligations when restricted stock units granted on March 24, 2022 vested and were delivered.

After this tax-withholding transaction, the insider beneficially owned 153,775 shares of Glaukos common stock. This total includes 89,621 restricted stock units that have been granted but have not yet vested or been delivered.

SEC Form 4

FORM 4

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
or Section 30(h) of the Investment Company Act of 1940

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

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Burns Thomas William

(Last) (First) (Middle)

C/O GLAUKOS CORPORATION

ONE GLAUKOS WAY

(Street)

ALISO VIEJO CA 92656

(City) (State) (Zip)

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

3. Date of Earliest Transaction (Month/Day/Year)
12/30/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	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	12/30/2025		F		1,098(1)	D	$114.24	153,775(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 (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	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 (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (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: 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

Explanation of Responses:

1. Consists of shares withheld by the Issuer with respect to tax withholding obligations of the Reporting Person upon vesting and delivery of shares of common stock underlying restricted stock units previously granted by the Issuer on March 24, 2022.

2. Includes 89,621 restricted stock units that have not yet vested or been delivered to the Reporting Person.

	Diana Scherer, Attorney-in-Fact	12/31/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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FAQ

What insider stock transaction did Glaukos (GKOS) report in this filing?

The filing reports that Glaukos’s Chairman and CEO had 1,098 shares of common stock withheld on 12/30/2025 to cover tax withholding obligations related to the vesting and delivery of previously granted restricted stock units.

Why were 1,098 Glaukos (GKOS) shares withheld from the reporting person?

The 1,098 shares were withheld by Glaukos to satisfy the reporting person’s tax withholding obligations when restricted stock units granted on March 24, 2022 vested and shares were delivered.

How many Glaukos (GKOS) shares does the CEO beneficially own after this transaction?

Following the reported transaction, the insider beneficially owned 153,775 shares of Glaukos common stock, as stated in the filing.

How many unvested restricted stock units does the Glaukos CEO hold?

The beneficial ownership total includes 89,621 restricted stock units that have been granted to the reporting person but have not yet vested or been delivered.

What is the role of the reporting person at Glaukos (GKOS)?

The reporting person is identified as a Director and as an Officer, specifically serving as the company’s Chairman & CEO.

What transaction code is used for this Glaukos insider transaction?

The transaction is reported with code F, which in this context reflects shares withheld by the issuer to satisfy the reporting person’s tax withholding obligations upon vesting of equity awards.