Glaukos (NYSE: GKOS) insider details RSU tax withholding on Form 4

Rhea-AI Filing Summary

Glaukos Corporation's Chief Development Officer reported a routine share withholding related to equity compensation. On 12/30/2025, 510 shares of common stock were withheld by the company at $114.24 per share to cover tax obligations when previously granted restricted stock units vested. After this transaction, the officer beneficially owned 77,451 shares of common stock. This total includes 43,562 restricted stock units that have been granted but have not yet vested or been delivered, meaning they may convert into shares over time if service or other conditions are met.

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^*

Navratil Tomas

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	CHIEF DEVELOPMENT OFFICER

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		510(1)	D	$114.24	77,451(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 43,562 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.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
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FAQ

What insider transaction did GLAUKOS (GKOS) report in this Form 4?

The Chief Development Officer reported that 510 shares of Glaukos common stock were withheld on 12/30/2025 to satisfy tax obligations upon vesting of restricted stock units.

Was the GKOS insider transaction a market sale or tax withholding?

The filing explains that the 510 shares were withheld by the issuer to cover tax withholding obligations when restricted stock units vested, rather than a discretionary open-market sale.

How many GLAUKOS (GKOS) shares does the reporting officer own after this transaction?

Following the reported withholding, the officer beneficially owned 77,451 shares of Glaukos common stock, as stated in the filing.

How many unvested restricted stock units does the GKOS officer hold?

The filing states that the ownership amount includes 43,562 restricted stock units that have not yet vested or been delivered to the reporting person.

What triggered the share withholding for the GLAUKOS (GKOS) insider?

The withholding was triggered by the vesting and delivery of shares underlying restricted stock units that were previously granted on March 24, 2022.

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

The reporting person is identified as an officer of Glaukos Corporation, serving as the Chief Development Officer.