Glaukos (GKOS) CEO Burns reports 5,212-share tax withholding and large trust holdings

Rhea-AI Filing Summary

Glaukos Corp Chairman and CEO Thomas William Burns reported a routine tax-withholding transaction related to equity compensation. On March 13, 2026, 5,212 shares of common stock were withheld by the company at $97.02 per share to satisfy his tax obligations upon vesting and delivery of previously granted restricted stock units.

After this withholding, Burns directly owns 245,252 common shares. He also has indirect ownership through several trusts, including 961,285 shares held through the Burns Family Trust, 238,107 shares through the Burns Annuity Trust, 120,000 shares through the Burns Charitable Remainder Trust, 100,000 shares through the Thomas W. Burns Irrevocable Trust, and 100,000 shares through the Janet M. Burns Irrevocable Trust. Footnotes state that his position also includes 69,929 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^*

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)
03/13/2026

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		5,212(1)	D	$97.02	245,252(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 13, 2025.

2. Includes 69,929 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 CEO Thomas Burns?

GLAUKOS Corp reported that CEO Thomas Burns had 5,212 common shares withheld to cover tax obligations on vested restricted stock units. This Form 4 reflects a tax-withholding disposition by the issuer, not an open-market sale by Burns.

At what price were Thomas Burns’ GKOS shares withheld for taxes?

The 5,212 Glaukos common shares were withheld at $97.02 per share to satisfy Thomas Burns’ tax obligations. This price comes from the Form 4 and represents the value used for the tax-withholding transaction tied to RSU vesting.

How many GKOS shares does Thomas Burns directly own after this Form 4 transaction?

Following the tax-withholding entry, Thomas Burns directly owns 245,252 Glaukos common shares. This figure is reported as his direct ownership balance after the 5,212 shares were withheld by the issuer for RSU-related tax obligations.

What indirect GKOS holdings does Thomas Burns report through family trusts?

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.

Does this GKOS Form 4 indicate an open-market sale by Thomas Burns?

No. The Form 4 shows a tax-withholding disposition coded “F,” meaning 5,212 shares were withheld by Glaukos to cover Burns’ RSU-related tax liabilities. It does not represent an open-market share sale by the CEO.

What unvested equity awards does Thomas Burns still hold at GLAUKOS Corp?

Footnotes state that Thomas Burns’ reported holdings include 69,929 restricted stock units that have not yet vested or been delivered. These RSUs represent additional potential future common shares, separate from his current direct and indirect share ownership.