GLAUKOS (GKOS) COO’s RSU vesting triggers 1,057-share tax withholding

Rhea-AI Filing Summary

GLAUKOS Corp President and COO Joseph E. Gilliam reported a Form 4 showing a tax-related share disposition tied to vesting equity awards. On this Form 4, 1,057 shares of common stock were withheld by the company at $119.17 per share to satisfy his tax withholding obligations when restricted stock units granted on March 18, 2021 vested and were delivered.

After this tax-withholding disposition, Gilliam directly owned 91,309 shares of GLAUKOS common stock, which includes 60,661 restricted stock units that have not yet vested or been delivered. This reflects an administrative equity and tax event rather than an open-market stock sale.

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^*

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)
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		1,057(1)	D	$119.17	91,309(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 60,661 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).
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FAQ

What did GLAUKOS (GKOS) President & COO Joseph Gilliam report on this Form 4?

Joseph Gilliam reported a tax-withholding disposition of GLAUKOS common stock. The company withheld shares when restricted stock units vested and were delivered, using part of his equity award to satisfy tax obligations instead of conducting an open-market sale.

How many GLAUKOS (GKOS) shares were disposed of for tax withholding on this Form 4?

The Form 4 shows 1,057 shares of GLAUKOS common stock disposed of through withholding. These shares were retained by the company at $119.17 per share to cover Joseph Gilliam’s tax obligations when his previously granted restricted stock units vested.

At what price were the withheld GLAUKOS (GKOS) shares valued in the Form 4?

The withheld GLAUKOS shares were valued at $119.17 per share. This price applies to the 1,057 shares retained by the company to satisfy Joseph Gilliam’s tax withholding obligations upon vesting and delivery of restricted stock units granted on March 18, 2021.

How many GLAUKOS (GKOS) shares does Joseph Gilliam own after this Form 4 transaction?

After the reported tax-withholding disposition, Joseph Gilliam directly holds 91,309 GLAUKOS shares. This total includes 60,661 restricted stock units that have not yet vested or been delivered, reflecting both currently owned shares and unvested equity awards.

What is the nature of the GLAUKOS (GKOS) Form 4 transaction reported by Joseph Gilliam?

The transaction is a tax-withholding disposition coded “F” on the Form 4. Shares were withheld by GLAUKOS to satisfy Joseph Gilliam’s tax obligations arising from the vesting and delivery of restricted stock units, not a discretionary open-market sale.

Which equity award is referenced in Joseph Gilliam’s GLAUKOS (GKOS) Form 4 footnote?

The footnote explains the tax-withholding relates to restricted stock units granted on March 18, 2021. When those units vested and shares were delivered, GLAUKOS withheld a portion of the resulting common stock to meet Joseph Gilliam’s tax withholding obligations.