Glaukos (NYSE: GKOS) CEO has 4,059 shares withheld to cover taxes

Rhea-AI Filing Summary

Glaukos Corp chairman and CEO Thomas William Burns reported a tax-withholding share disposition related to restricted stock units. On February 24, 2026, 4,059 shares of common stock were withheld by Glaukos at $119.17 per share to satisfy his tax obligations upon RSU vesting.

After this transaction, Burns directly owns 251,562 shares of Glaukos common stock, which the footnotes state include 81,912 unvested restricted stock units. He also reports additional indirect ownership through multiple Burns family-related trusts, each holding separate blocks of Glaukos shares.

Insider Trade Summary

6 transactions reported

Mixed 6 txns

Insider Burns Thomas William

Role CHAIRMAN & CEO

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	4,059	$119.17	$484K
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 251,562 shares (Direct); Common Stock — 961,285 shares (Indirect, Through the Burns Family Trust)

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 18, 2021. Includes 81,912 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).

X

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)
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		4,059(1)	D	$119.17	251,562(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 18, 2021.

2. Includes 81,912 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.
* 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) CEO Thomas Burns report in this Form 4?

Thomas William Burns reported a tax-withholding disposition of 4,059 Glaukos common shares. The shares were withheld by the company at $119.17 per share to cover his tax obligations when restricted stock units granted on March 18, 2021 vested and were delivered.

How many Glaukos (GKOS) shares does Thomas Burns hold directly after the transaction?

After the reported transaction, Thomas William Burns directly holds 251,562 Glaukos common shares. A footnote explains this direct position includes 81,912 restricted stock units that have not yet vested or been delivered, reflecting both settled shares and unvested equity awards in his direct holdings.

What does transaction code F mean in the Glaukos (GKOS) Burns filing?

Transaction code F indicates payment of an exercise price or tax liability by delivering securities. In this case, 4,059 Glaukos shares were withheld by the issuer to satisfy Thomas Burns’ tax withholding obligations tied to vesting of previously granted restricted stock units, rather than an open-market sale.

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

Thomas Burns reports several indirect Glaukos holdings: 961,285 shares through the Burns Family Trust, 238,107 through the Burns Annuity Trust, 120,000 through the Burns Charitable Remainder Trust, and 100,000 shares each through the Thomas W. Burns and Janet M. Burns Irrevocable Trusts, reflecting family-related ownership structures.

Is the Glaukos (GKOS) Form 4 transaction by Thomas Burns an open-market sale?

No, the transaction is not an open-market sale. Code F and the footnote show 4,059 shares were withheld by Glaukos to cover Thomas Burns’ tax obligations upon RSU vesting, meaning the shares were used for tax withholding rather than sold into the public market.