Glaukos (NYSE: GKOS) CEO has 1,098 shares withheld for taxes

Rhea-AI Filing Summary

Glaukos Corp (GKOS) Chairman & CEO Thomas William Burns reported a tax-related share disposition on March 5, 2026. The company withheld 1,098 shares of common stock at $112.10 per share to cover his tax obligations when previously granted restricted stock units vested.

After this withholding, he directly owns 250,464 common shares, which includes 79,828 restricted stock units that have not yet vested or been delivered. He also reports indirect ownership through several Burns family and charitable trusts, including the Burns Family Trust, Burns Annuity Trust, Burns Charitable Remainder Trust, and two irrevocable trusts, each with disclosed share balances as of the same date.

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

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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)
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)		1,098	D	$112.1	250,464(2)	D
Common Stock								961,285	I	Through the Burns Family Trust
Common Stock								238,107	I	Through the Burns Annuity Trust
Common Stock								120,000	I	Through the Burns Charitable Remainder Trust
Common Stock								100,000	I	Through the Thomas W. Burns Irrevocable Trust
Common Stock								100,000	I	Through the Janet M. Burns Irrevocable Trust

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 79,828 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).
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FAQ

What insider transaction did Glaukos (GKOS) report for CEO Thomas Burns?

Glaukos reported that CEO Thomas Burns had 1,098 common shares withheld to cover tax obligations when restricted stock units vested. This was a tax-withholding disposition by the issuer, not an open-market buy or sell of Glaukos stock.

Was the Glaukos (GKOS) CEO’s Form 4 transaction an open-market stock sale?

No. The Form 4 shows 1,098 Glaukos shares withheld by the company to satisfy Thomas Burns’ tax obligations on vesting restricted stock units. It reflects tax withholding, not a discretionary open-market sale of shares by the CEO.

How many Glaukos (GKOS) shares does CEO Thomas Burns own directly after this filing?

After the tax withholding, Thomas Burns directly owns 250,464 Glaukos common shares. This total includes 79,828 restricted stock units that have not yet vested or been delivered, as disclosed in the Form 4 footnotes.

What indirect Glaukos (GKOS) share holdings are reported for Thomas Burns?

The Form 4 reports indirect ownership of Glaukos common stock through several entities: the Burns Family Trust, Burns Annuity Trust, Burns Charitable Remainder Trust, and two separate irrevocable trusts for Thomas and Janet Burns, each with specified share balances.

What role do restricted stock units play in the Glaukos (GKOS) CEO’s holdings?

Restricted stock units are part of Thomas Burns’ equity compensation. The Form 4 notes 79,828 RSUs that have not yet vested or been delivered, and indicates that the 1,098 shares withheld covered taxes on RSUs granted on March 24, 2022.

Why were 1,098 Glaukos (GKOS) shares withheld from CEO Thomas Burns?

Glaukos withheld 1,098 shares to satisfy Thomas Burns’ tax withholding obligations upon vesting and delivery of common shares underlying restricted stock units granted on March 24, 2022. This is a standard mechanism for handling tax liabilities on equity awards.