[Form 4] GLAUKOS Corp Insider Trading Activity

Rhea-AI Filing Summary

Joseph E. Gilliam, President & COO of Glaukos Corporation (GKOS), reported a transaction on 09/23/2025 where 1,056 shares of common stock were disposed of at $84.69 per share. The filing states these shares were withheld by the issuer to satisfy tax withholding obligations when restricted stock units vested and were delivered (these RSUs were originally granted on March 18, 2021). After the withholding, the reporting person beneficially owns 111,706 shares, of which 62,605 restricted stock units remain unvested and undelivered. The Form 4 is signed by an attorney-in-fact on 09/24/2025.

Positive

• Timely disclosure of the transaction consistent with Section 16 filing requirements
• Insider retains substantial ownership with 111,706 shares beneficially owned after withholding

Negative

• None.

Insights

Securities Analyst

TL;DR: Routine insider tax-withholding sale on vested RSUs; no new open-market sale or cash disposition disclosed.

The report indicates the disposition of 1,056 shares via issuer withholding to satisfy tax obligations upon RSU vesting. This is a non-discretionary, administrative transaction rather than a voluntary open-market sale. The filing confirms 111,706 shares beneficially owned post-transaction and identifies 62,605 RSUs not yet vested, which is useful for assessing potential future dilution and insider alignment. No other purchases, sales, or option exercises are shown.

Corporate Governance Specialist

TL;DR: Disclosure reflects standard post-vesting withholding; governance signal is neutral.

The Form 4 documents share withholding to cover tax liabilities on vested restricted stock units granted in 2021. Such withholding is a common administrative step and does not indicate insider intent to liquidate holdings. The remaining 62,605 unvested RSUs represent future compensation subject to vesting conditions. The filing is timely and signed by an attorney-in-fact, meeting disclosure formalities.

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^*

Gilliam Joseph E

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	PRESIDENT & COO

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		1,056(1)	D	$84.69	111,706(2)	D

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 62,605 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.
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 transaction did GKOS insider Joseph E. Gilliam report on 09/23/2025?

The filing reports a disposition of 1,056 shares at $84.69 per share on 09/23/2025, resulting from issuer withholding to cover tax obligations upon RSU vesting.

How many shares does Joseph E. Gilliam beneficially own after the reported transaction?

After the reported withholding, the filing shows the reporting person beneficially owns 111,706 shares.

How many restricted stock units are still unvested for the reporting person?

The Form 4 states there are 62,605 restricted stock units that have not yet vested or been delivered.

Why were shares disposed of according to the Form 4?

The filing explicitly states the shares were withheld by the issuer to satisfy tax withholding obligations upon vesting and delivery of RSUs granted on March 18, 2021.

Who signed the Form 4 and when was it signed?

The Form 4 is signed by Diana Scherer, Attorney-in-Fact on 09/24/2025.