Glaukos (NYSE: GKOS) CDO has shares withheld to cover RSU taxes

Rhea-AI Filing Summary

Glaukos Corp's Chief Development Officer Tomas Navratil reported a small share disposal related to tax withholding. On March 5, 2026, 361 shares of common stock at $112.10 per share were withheld by the company to satisfy his tax obligations upon vesting of previously granted restricted stock units.

After this tax-withholding disposition, Navratil directly holds 76,694 shares of common stock, which includes 41,561 restricted stock units that have not yet vested or been delivered to him.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Navratil Tomas

Role CHIEF DEVELOPMENT OFFICER

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	361	$112.10	$40K

Holdings After Transaction: Common Stock — 76,694 shares (Direct)

Footnotes (1)

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. Includes 41,561 restricted stock units that have not yet vested or been delivered to the Reporting Person.

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Form 4 Insider Transactions: What Each Field Means →

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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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)
03/05/2026

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	03/05/2026		F(1)		361	D	$112.1	76,694(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 41,561 restricted stock units that have not yet vested or been delivered to the Reporting Person.

	Diana Scherer, Attorney-in-Fact	03/09/2026
	** 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).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What did Glaukos (GKOS) insider Tomas Navratil report in this Form 4?

Tomas Navratil, Chief Development Officer of Glaukos, reported a tax-related share disposal. On March 5, 2026, 361 common shares were withheld by the company to cover tax obligations tied to vesting restricted stock units granted on March 24, 2022.

How many Glaukos (GKOS) shares were disposed of for tax withholding?

A total of 361 Glaukos common shares were disposed of for tax withholding. The shares were withheld by the issuer at a price of $112.10 per share in connection with the vesting and delivery of restricted stock units previously granted to Tomas Navratil.

What does the tax-withholding disposition mean in the Glaukos (GKOS) Form 4?

The tax-withholding disposition reflects shares withheld by Glaukos to satisfy Tomas Navratil’s tax obligations. It occurred upon vesting and delivery of common shares underlying restricted stock units that were originally granted to him on March 24, 2022.

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

Following the tax-withholding transaction, Tomas Navratil directly holds 76,694 Glaukos common shares. This figure includes 41,561 restricted stock units that have not yet vested or been delivered, as noted in the Form 4 footnotes.

Were the Glaukos (GKOS) shares sold on the open market in this Form 4?

No, the shares were not reported as open-market sales. The Form 4 describes the transaction as a tax-withholding disposition, with 361 shares withheld by Glaukos to cover tax liabilities when restricted stock units vested and shares were delivered.

What role does Tomas Navratil hold at Glaukos (GKOS) in this Form 4?

In this Form 4, Tomas Navratil is identified as the Chief Development Officer of Glaukos Corp. The reported transaction involves his equity compensation, specifically restricted stock units that vested and triggered related tax-withholding shares.