Glaukos (NYSE: GKOS) CDO reports tax-withholding of 1,074 shares

Rhea-AI Filing Summary

Glaukos Corp chief development officer Tomas Navratil reported a tax-related share disposition. On March 13, 2026, 1,074 shares of common stock were withheld at $97.02 per share to satisfy tax withholding obligations tied to vesting restricted stock units.

After this tax-withholding disposition, Navratil directly holds 75,620 shares of common stock, which includes 38,456 restricted stock units that 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^*

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)
03/13/2026

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	03/13/2026		F		1,074(1)	D	$97.02	75,620(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 13, 2025.

2. Includes 38,456 restricted stock units that have not yet vested or been delivered to the Reporting Person.

	Diana Scherer, Attorney-in-Fact	03/17/2026
	** 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 1,074 common shares withheld on March 13, 2026 to cover tax obligations. The withholding was tied to vesting restricted stock units and was not an open-market purchase or sale.

Was the March 13, 2026 GKOS insider transaction an open-market sale?

No, the March 13, 2026 transaction was a tax-withholding disposition, not an open-market sale. Shares were withheld by Glaukos Corp to satisfy Navratil’s tax liability upon vesting and delivery of restricted stock units previously granted.

How many GLAUKOS Corp (GKOS) shares were withheld for taxes from Tomas Navratil?

Glaukos Corp withheld 1,074 shares of common stock from Tomas Navratil at $97.02 per share. The withholding satisfied tax obligations arising when restricted stock units vested and shares were delivered to him under a prior equity grant.

How many GLAUKOS Corp (GKOS) shares does Tomas Navratil hold after this transaction?

After the March 13, 2026 tax-withholding transaction, Tomas Navratil directly holds 75,620 Glaukos Corp common shares. This figure includes 38,456 restricted stock units that have been granted but have not yet vested or been delivered.

What does the Form 4 footnote say about Tomas Navratil’s unvested GKOS restricted stock units?

The Form 4 footnote states that Navratil’s holdings include 38,456 restricted stock units that have not yet vested or been delivered. These units represent additional potential share delivery in the future, subject to the applicable vesting conditions.