Glaukos (NYSE: GKOS) CEO updates trust holdings, uses shares for tax withholding

Rhea-AI Filing Summary

Glaukos Corp chairman and CEO Thomas William Burns reported updated holdings of the company’s common stock, mainly through several family and charitable trusts. The filing lists indirect positions including 100,000 shares through the Janet M. Burns Irrevocable Trust and 1,141,593 shares through the Burns Family Trust.

The only actual share movement was a tax-withholding disposition of 4,059 directly held shares at $142.57 per share to satisfy tax obligations upon vesting and delivery of restricted stock units granted on March 18, 2021. After this, he directly holds 68,967 shares, and his position also includes 56,382 restricted stock units that have not yet vested or been delivered.

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	$142.57	$579K
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 68,967 shares (Direct, null); Common Stock — 1,141,593 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 56,382 restricted stock units that have not yet vested or been delivered to the Reporting Person.

Key Figures

Tax-withheld shares: 4,059 shares Tax-withholding price: $142.57/share Direct shares after transaction: 68,967 shares +4 more

7 metrics

Tax-withheld shares 4,059 shares Shares withheld to cover tax obligations on RSU vesting

Tax-withholding price $142.57/share Price for 4,059 shares used for tax withholding

Direct shares after transaction 68,967 shares Direct Glaukos common stock held by Thomas Burns after tax withholding

Janet M. Burns Irrevocable Trust 100,000 shares Indirect Glaukos holdings through this trust

Burns Family Trust 1,141,593 shares Indirect Glaukos holdings through the Burns Family Trust

Charitable Remainder Trust 120,000 shares Indirect Glaukos holdings through the Burns Charitable Remainder Trust

Unvested RSUs 56,382 units Restricted stock units not yet vested or delivered

Key Terms

restricted stock units, tax withholding obligations, irrevocable trust, charitable remainder trust, +1 more

5 terms

restricted stock units financial

"Includes 56,382 restricted stock units that have not yet vested or been delivered"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

tax withholding obligations financial

"shares withheld by the Issuer with respect to tax withholding obligations of the Reporting Person"

irrevocable trust financial

"Through the Janet M. Burns Irrevocable Trust"

An irrevocable trust is a legal arrangement where an owner transfers assets into a separate entity managed by a trustee and gives up the power to modify or reclaim those assets. For investors it matters because putting stock or other holdings into such a trust can change who controls and benefits from the assets, affect taxes and creditor protection, and influence how easy it is to sell or value those holdings—like placing valuables in a locked safe overseen by someone else.

charitable remainder trust financial

"Through the Burns Charitable Remainder Trust"

annuity trust financial

"Through the Burns Annuity Trust"

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 06/29/2026 - 06:12 PM Accepted by SEC EDGAR 06/29/2026 - 06:12 PM Learn about SEC filing dates

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^*

Burns Thomas William

(Last) (First) (Middle)

C/O GLAUKOS CORPORATION

ONE GLAUKOS WAY

(Street)

ALISO VIEJO CALIFORNIA 92656

(City) (State) (Zip)

UNITED STATES

(Country)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/25/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

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	06/25/2026		F		4,059(1)	D	$142.57	68,967(2)	D
Common Stock								1,141,593	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 56,382 restricted stock units that have not yet vested or been delivered to the Reporting Person.

	Diana Scherer, Attorney-in-Fact	06/29/2026
	** 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.
* Form 4: SEC 1474 (03-26)

FAQ

What did Glaukos (GKOS) CEO Thomas Burns report in this Form 4?

Thomas Burns reported his direct and indirect holdings of Glaukos common stock, mainly in several family and charitable trusts. The filing also records a small tax-related share disposition and notes additional unvested restricted stock units tied to prior equity awards.

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

The filing shows 4,059 Glaukos common shares were withheld at $142.57 per share. These shares covered Thomas Burns’ tax obligations when previously granted restricted stock units vested and were delivered, rather than representing an open-market sale of stock.

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

After the tax-withholding transaction, Thomas Burns directly holds 68,967 Glaukos common shares. This direct position is in addition to substantial indirect holdings through various family and charitable trusts and a separate block of unvested restricted stock units.

What indirect Glaukos (GKOS) holdings are reported through Burns-related trusts?

The filing lists indirect Glaukos holdings including 100,000 shares via the Janet M. Burns Irrevocable Trust and 1,141,593 shares via the Burns Family Trust. Other Burns-related trusts, such as annuity and charitable remainder trusts, also hold additional Glaukos common shares.

What are the restricted stock units mentioned for Glaukos (GKOS) CEO Thomas Burns?

The Form 4 notes that Thomas Burns has 56,382 restricted stock units that have not yet vested or been delivered. These units represent future share-based compensation and are separate from his currently outstanding common stock holdings reported in the filing.

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

No. The 4,059 shares reported with code F were withheld by Glaukos to cover Thomas Burns’ tax obligations on vesting restricted stock units. This type of disposition is administrative and not an open-market share sale initiated for trading purposes.