Glaukos (GKOS) president uses 3,169 shares to cover tax withholding

Rhea-AI Filing Summary

GLAUKOS Corp president and COO Joseph E. Gilliam reported a routine tax-withholding share disposition tied to equity compensation. On the vesting and delivery of previously granted restricted stock units, 3,169 shares of common stock were withheld by the company at $109.60 per share to cover his tax obligations.

After this non-market transaction, he directly holds 92,992 shares of GLAUKOS common stock, including 43,925 restricted stock units that have not yet vested or been delivered. The filing does not reflect an open-market purchase or sale, but rather the automated tax treatment of stock-based compensation.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Gilliam Joseph E

Role PRESIDENT & COO

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	3,169	$109.60	$347K

Holdings After Transaction: Common Stock — 92,992 shares (Direct)

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 14, 2024. Includes 43,925 restricted stock units that have not yet vested or been delivered to the Reporting Person.

Key Figures

Shares withheld for taxes: 3,169 shares Tax-withholding price: $109.60 per share Shares held after transaction: 92,992 shares +1 more

4 metrics

Shares withheld for taxes 3,169 shares Tax-withholding disposition on RSU vesting

Tax-withholding price $109.60 per share Value used for withheld GLAUKOS shares

Shares held after transaction 92,992 shares Direct ownership following tax withholding

Unvested restricted stock units 43,925 RSUs RSUs not yet vested or delivered to Gilliam

Key Terms

restricted stock units, tax withholding obligations, vesting and delivery

3 terms

restricted stock units financial

"underlying restricted stock units previously granted by the Issuer on March 14, 2024"

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"

vesting and delivery financial

"upon vesting and delivery of shares of common stock underlying restricted stock units"

Form 4 Insider Transactions: What Each Field Means →

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^*

Gilliam Joseph E

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
04/02/2026

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	04/02/2026		F		3,169(1)	D	$109.6	92,992(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 14, 2024.

2. Includes 43,925 restricted stock units that have not yet vested or been delivered to the Reporting Person.

	Diana Scherer, Attorney-in-Fact	04/03/2026
	** 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 insider transaction did GLAUKOS (GKOS) president Joseph Gilliam report?

Joseph E. Gilliam reported a tax-withholding disposition of 3,169 shares of GLAUKOS common stock. The shares were withheld by the company at $109.60 per share to satisfy tax obligations triggered when previously granted restricted stock units vested and were delivered.

Was the latest GKOS insider transaction an open-market sale or purchase?

The reported GKOS insider transaction was not an open-market sale or purchase. It was a tax-withholding disposition, where 3,169 shares were retained by the company to cover Joseph Gilliam’s tax obligations upon vesting of restricted stock units granted on March 14, 2024.

How many GLAUKOS (GKOS) shares does Joseph Gilliam hold after this filing?

After this filing, Joseph Gilliam directly holds 92,992 shares of GLAUKOS common stock. That total includes 43,925 restricted stock units that have not yet vested or been delivered, reflecting both settled shares and remaining unvested equity awards from prior grants.

What triggered the tax-withholding share disposition in the GKOS Form 4?

The tax-withholding disposition was triggered when restricted stock units granted on March 14, 2024 vested and shares were delivered. To meet associated tax withholding obligations, 3,169 shares of GLAUKOS common stock were withheld by the issuer instead of being received as freely tradable shares.

What price per share was used for the GKOS tax-withholding transaction?

The tax-withholding transaction used a price of $109.60 per share for the 3,169 GLAUKOS shares withheld. This per-share value is used solely for calculating the tax withholding amount tied to the vesting of restricted stock units, not for an open-market sale.