Glaukos withholds 755 Navratil shares for taxes

GLAUKOS Corp (GKOS) chief development officer Tomas Navratil had 755 common shares withheld by the issuer on April 9, 2024, to satisfy tax withholding obligations upon vesting and delivery of shares underlying restricted stock units.

Available on EDGAR 11/03/2026 - 08:55 PM EST Accepted by SEC EDGAR 11/03/2026 - 08:55 PM EST Learn about SEC filing dates

Rhea-AI Filing Summary

GLAUKOS Corp (GKOS) chief development officer Tomas Navratil had 755 common shares withheld by the issuer on April 9, 2024, to satisfy tax withholding obligations upon vesting and delivery of shares underlying restricted stock units. The transactions comprised 495 shares at $87.61 per share tied to units granted March 18, 2021, and 260 shares at $93.23 per share tied to units granted March 24, 2022.

Insider Trade Summary

Tax Withholding: 755 shares

Tax Withholding 2 txns

Insider Navratil Tomas

Role CHIEF DEVELOPMENT OFFICER

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock F1, F2	495	$87.61	$43K
Tax Withholding	Common Stock F3, F4	260	$93.23	$24K

Holdings After Transaction: Common Stock — 68,536 shares (Direct)

Footnotes (4)

1. F1. 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. This transaction is exempt pursuant to Rule 16b-3.
2. F2. Reflects the amount of securities beneficially owned as of the date this Form is filed, not the date of the transaction, and includes 37,841 restricted stock units that have not yet vested or been delivered to the Reporting Person.
3. F3. 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 24, 2022. This transaction is exempt pursuant to Rule 16b-3.
4. F4. Reflects the amount of securities beneficially owned as of the date this Form is filed, not the date of the transaction, and includes 37,328 restricted stock units that have not yet vested or been delivered to the Reporting Person.

Key Figures

Shares withheld for tax obligations: 755 shares First withholding transaction: 495 shares Price per share: $87.61 per share +2 more

5 metrics

Shares withheld for tax obligations 755 shares April 9, 2024

First withholding transaction 495 shares April 9, 2024; restricted stock units granted March 18, 2021

Price per share $87.61 per share 495 shares withheld on April 9, 2024

Second withholding transaction 260 shares April 9, 2024; restricted stock units granted March 24, 2022

Price per share $93.23 per share 260 shares withheld on April 9, 2024

Key Terms

restricted stock units, tax withholding obligations, Rule 16b-3

3 terms

restricted stock units financial

"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

"withheld by the Issuer with respect to tax withholding obligations"

Rule 16b-3 regulatory

"This transaction is exempt pursuant to Rule 16b-3."

Rule 16b-3 is a Securities and Exchange Commission regulation that exempts certain routine, pre-approved transactions by company insiders from automatic liability for short-term trading profits. It acts like a safe harbor: if an insider follows a formal plan or the board approves specific transactions in advance, profits from buying and selling company stock within six months are not automatically reclaimed. Investors care because the rule clarifies when insider trades are permissible and reduces uncertainty about potential clawbacks.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many GKOS shares were withheld from Tomas Navratil for taxes?

A total of 755 common shares were withheld on April 9, 2024: 495 shares at $87.61 per share and 260 shares at $93.23 per share. The withholding related to tax obligations upon vesting and delivery of restricted stock units.

AI-generated analysis. How Rhea-AI works. Not financial advice.

Form 4 Insider Transactions: What Each Field Means →

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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^*

Navratil Tomas

(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)
	CHIEF DEVELOPMENT OFFICER

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
04/09/2024

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	04/09/2024		F		495(1)	D	$87.61	68,796(2)	D
Common Stock	04/09/2024		F		260(3)	D	$93.23	68,536(4)	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. This transaction is exempt pursuant to Rule 16b-3.

2. Reflects the amount of securities beneficially owned as of the date this Form is filed, not the date of the transaction, and includes 37,841 restricted stock units that have not yet vested or been delivered to the Reporting Person.

3. 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 24, 2022. This transaction is exempt pursuant to Rule 16b-3.

4. Reflects the amount of securities beneficially owned as of the date this Form is filed, not the date of the transaction, and includes 37,328 restricted stock units that have not yet vested or been delivered to the Reporting Person.

	Diana Scherer, Attorney-in-Fact	11/03/2026
	** 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)