Glaukos (NYSE: GKOS) CDO reports 396-share tax-withholding disposition

Rhea-AI Filing Summary

Glaukos Corp’s chief development officer, Tomas Navratil, reported a small tax-related share disposition. On the vesting of previously granted restricted stock units, 396 shares of common stock were withheld by the company at $119.17 per share to cover tax obligations. After this withholding, Navratil directly holds 77,055 shares of common stock, including 42,588 restricted stock units that are granted but not yet vested or 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^*

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)
02/24/2026

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	02/24/2026		F		396(1)	D	$119.17	77,055(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 18, 2021.

2. Includes 42,588 restricted stock units that have not yet vested or been delivered to the Reporting Person.

	Diana Scherer, Attorney-in-Fact	02/26/2026
	** 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 transaction did Glaukos Corp (GKOS) report for Tomas Navratil?

Glaukos Corp reported that chief development officer Tomas Navratil had 396 common shares withheld to cover tax obligations upon RSU vesting. This was a tax-withholding disposition, not an open-market sale, and was triggered by previously granted restricted stock units.

Was the Glaukos (GKOS) Form 4 transaction an open-market sale of shares?

No, the Form 4 shows a tax-withholding disposition, not an open-market sale. Glaukos withheld 396 shares upon vesting and delivery of restricted stock units to satisfy Navratil’s tax obligations tied to equity compensation granted in March 2021.

How many Glaukos (GKOS) shares does Tomas Navratil hold after this Form 4 event?

After the reported transaction, Tomas Navratil directly holds 77,055 shares of Glaukos common stock. This total includes both currently held shares and equity-related holdings, such as restricted stock units referenced in the filing’s footnotes.

What does the restricted stock unit information mean in the Glaukos (GKOS) filing?

The footnotes state that Navratil has 42,588 restricted stock units that are granted but not yet vested or delivered. These units represent potential future share deliveries, contingent on vesting conditions, and are separate from the 396 shares withheld for taxes.

What is transaction code F in the Glaukos (GKOS) Form 4 for Tomas Navratil?

Transaction code F in this Form 4 represents payment of the exercise price or tax liability by delivering securities. Here, it reflects Glaukos withholding 396 shares from Navratil upon RSU vesting to satisfy his tax-withholding obligations instead of him paying cash.