[Form 4] GLAUKOS Corp Insider Trading Activity

Rhea-AI Filing Summary

Thomas W. Burns, who serves as Chairman & CEO and a director of Glaukos Corporation (GKOS), reported a disposition of 4,059 shares of common stock on 09/23/2025 at a price of $84.69 per share due to shares withheld for tax obligations upon vesting of previously granted restricted stock units. After the reported transaction, he beneficially owns 150,705 shares directly and holds additional indirect holdings through family and trust vehicles totaling 1,452,039 shares when summing disclosed indirect positions and unvested units: 893,932 (Burns Family Trust), 238,107 (Burns Annuity Trust), 120,000 (Burns Charitable Remainder Trust), 100,000 (Thomas W. Burns Irrevocable Trust), and 100,000 (Janet M. Burns Irrevocable Trust). The filing also notes 87,537 restricted stock units that have not yet vested or been delivered.

Positive

• Substantial insider ownership: Combined direct and indirect holdings indicate significant alignment with shareholders.
• Use of equity incentives: 87,537 unvested restricted stock units demonstrate ongoing retention incentives for the CEO.
• Disposition was administrative: The 4,059-share change was due to tax withholding on vesting rather than an open-market sale.

Negative

• Sundry dilution potential: 87,537 unvested RSUs, when vested and delivered, will increase share count and may dilute existing holders.
• Reduction in direct shares: 4,059 shares were disposed of (withheld) reducing direct beneficial ownership.

Insights

Corporate Governance Expert

TL;DR: CEO maintains substantial ownership across direct and trust holdings, aligning interests with shareholders.

The Form 4 discloses a routine withholding disposition of 4,059 shares to satisfy tax obligations on vested restricted stock units, a common administrative action rather than an open-market sale. Reported beneficial ownership combines direct holdings and multiple trust vehicles, showing concentrated ownership by the Burns family. The presence of 87,537 unvested RSUs signals remaining equity retention incentives. For governance, concentrated insider ownership can support long-term alignment but also concentrates voting power.

Securities Analyst

TL;DR: Transaction appears administrative; material ownership remains substantial across disclosed accounts.

The disposition at $84.69 per share reflects shares withheld upon vesting rather than a sale for liquidity, per the explanatory note. Post-transaction direct beneficial ownership is 150,705 shares, with significant indirect holdings through five named trusts totaling over one million shares in aggregate. The disclosed 87,537 unvested RSUs represent future potential dilution when they vest and are delivered. Overall, the filing does not indicate an immediate change to control or significant market impact.

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
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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).

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)
09/23/2025

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	09/23/2025		F		4,059(1)	D	$84.69	150,705(2)	D
Common Stock								893,932	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 87,537 restricted stock units that have not yet vested or been delivered to the Reporting Person.

	Diana Scherer, Attorney-in-Fact	09/24/2025
	** 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.
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FAQ

What transaction did Thomas W. Burns report for GKOS?

The Form 4 reports a disposition of 4,059 shares of Glaukos common stock on 09/23/2025 at $84.69 per share due to tax withholding on vested RSUs.

How many shares does the reporting person beneficially own after the transaction?

Following the reported transaction, the reporting person beneficially owns 150,705 shares directly, plus substantial indirect holdings through multiple trusts.

Are there unvested restricted stock units disclosed in the GKOS filing?

Yes. The filing explicitly states there are 87,537 restricted stock units that have not yet vested or been delivered.

Did the Form 4 indicate an open-market sale by the CEO of GKOS?

No. The explanatory note specifies the shares were withheld by the issuer to satisfy tax withholding obligations upon vesting of RSUs, not sold in the open market.

Through which vehicles does Thomas W. Burns hold indirect GKOS shares?

Indirect holdings are reported through the Burns Family Trust, Burns Annuity Trust, Burns Charitable Remainder Trust, Thomas W. Burns Irrevocable Trust, and Janet M. Burns Irrevocable Trust.