Glaukos (NYSE: GKOS) president has 1,056 shares withheld for taxes

Rhea-AI Filing Summary

GLAUKOS Corp President & COO Joseph E. Gilliam reported a routine tax-related share disposition. On the vesting and delivery of previously granted restricted stock units, the company withheld 1,056 shares of common stock to cover his tax withholding obligations at $142.57 per share.

After this withholding, Gilliam directly holds 72,363 shares of common stock. This position includes 41,983 restricted stock units that have been granted but have not yet vested or been delivered, reflecting ongoing equity-based compensation rather than an open-market sale.

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	1,056	$142.57	$151K

Holdings After Transaction: Common Stock — 72,363 shares (Direct, null)

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 41,983 restricted stock units that have not yet vested or been delivered to the Reporting Person.

Key Figures

Tax-withheld shares: 1,056 shares Withholding share price: $142.57 per share Shares held after transaction: 72,363 shares +3 more

6 metrics

Tax-withheld shares 1,056 shares Shares withheld to cover tax obligations on RSU vesting

Withholding share price $142.57 per share Value applied to the 1,056 withheld shares

Shares held after transaction 72,363 shares Direct common stock holdings after tax withholding

Unvested RSUs 41,983 restricted stock units RSUs granted but not yet vested or delivered

Transaction date June 25, 2026 Date of tax-withholding disposition

Grant date of RSUs March 18, 2021 Original grant date of underlying restricted stock units

Key Terms

restricted stock units, tax withholding obligations, vesting and delivery, tax-withholding disposition

4 terms

restricted stock units financial

"delivery of shares of common stock underlying restricted stock units previously granted"

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"

tax-withholding disposition financial

"transaction_action: tax-withholding disposition for the reported shares"

A tax-withholding disposition is an event or transaction—such as selling or transferring securities, exercising options, or receiving compensation—that triggers a requirement to hold back part of the payment and remit it to tax authorities. It matters to investors because it reduces the cash they receive immediately and can change the timing and amount of taxable income, like a cashier taking a portion of your sale proceeds to pay taxes before you get the rest.

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 06/29/2026 - 06:06 PM Accepted by SEC EDGAR 06/29/2026 - 06:06 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^*

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)
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		1,056(1)	D	$142.57	72,363(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 41,983 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) President & COO Joseph Gilliam report in this Form 4?

Joseph Gilliam reported a tax-related share disposition. The company withheld 1,056 shares of GLAUKOS common stock to satisfy his tax obligations when previously granted restricted stock units vested and were delivered.

Was the GLAUKOS (GKOS) Form 4 transaction an open-market sale?

No, the transaction was not an open-market sale. It was a tax-withholding disposition, where 1,056 shares were withheld by GLAUKOS to cover Joseph Gilliam’s tax obligations upon RSU vesting.

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

After the tax withholding, Joseph Gilliam directly holds 72,363 shares of GLAUKOS common stock. This figure reflects his position following the withholding of 1,056 shares for tax obligations tied to RSU vesting.

What is the significance of the 41,983 restricted stock units for GLAUKOS (GKOS) President?

Joseph Gilliam has 41,983 restricted stock units that are granted but not yet vested or delivered. These RSUs represent additional potential future shares as they vest, forming a meaningful part of his ongoing equity compensation.

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

The 1,056 withheld shares were valued at $142.57 per share. This price is used in the filing to reflect the value of shares delivered to cover Joseph Gilliam’s tax withholding obligations upon RSU vesting and delivery.

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

The footnote states the withheld shares relate to restricted stock units granted on March 18, 2021. Those RSUs vested and were delivered, and a portion of the resulting shares was withheld to satisfy Joseph Gilliam’s tax obligations.