Glaukos (NYSE: GKOS) CDO reports RSU tax withholding transactions

Filing Impact

(Moderate)

Filing Sentiment

(Neutral)

Form Type

Rhea-AI Filing Summary

Glaukos Corp’s Chief Development Officer Tomas Navratil reported a routine tax-withholding disposition of 2,977 shares of common stock. The issuer withheld 1,146 shares and 1,831 shares at $109.60 per share to cover tax obligations upon vesting and delivery of restricted stock units granted in 2022 and 2024.

After these withholdings, Navratil directly owns 92,463 shares of common stock. His position also reflects 43,483 restricted stock units from the March 24, 2022 grant and 39,791 restricted stock units from the March 14, 2024 grant that have not yet vested or been delivered.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider Navratil Tomas

Role CHIEF DEVELOPMENT OFFICER

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	1,146	$109.60	$126K
Tax Withholding	Common Stock	1,831	$109.60	$201K

Holdings After Transaction: Common Stock — 94,294 shares (Direct)

Footnotes (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 24, 2022. Includes 43,483 restricted stock units that have not yet vested or been delivered to the Reporting Person. 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 39,791 restricted stock units that have not yet vested or been delivered to the Reporting Person.

Key Figures

Tax-withheld lot 1: 1,146 shares at $109.60 Tax-withheld lot 2: 1,831 shares at $109.60 Total shares withheld for taxes: 2,977 shares +4 more

7 metrics

Tax-withheld lot 1 1,146 shares at $109.60 Shares withheld to cover tax obligations on RSU vesting from March 24, 2022 grant

Tax-withheld lot 2 1,831 shares at $109.60 Shares withheld to cover tax obligations on RSU vesting from March 14, 2024 grant

Total shares withheld for taxes 2,977 shares Aggregate tax-withholding dispositions on April 2, 2026

Post-transaction holdings 92,463 shares Common stock directly owned by Tomas Navratil after reported transactions

Unvested RSUs (2022 grant) 43,483 RSUs Restricted stock units from March 24, 2022 grant not yet vested or delivered

Unvested RSUs (2024 grant) 39,791 RSUs Restricted stock units from March 14, 2024 grant not yet vested or delivered

Implied share price $109.60 per share Value used for tax-withholding dispositions on April 2, 2026

Key Terms

restricted stock units, tax withholding obligations, Form 4, non-derivative, +1 more

5 terms

restricted stock units financial

"underlying restricted stock units previously granted by the Issuer on March 24, 2022"

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"

Form 4 regulatory

"INSIDER FILING DATA (Form 4):"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

non-derivative financial

"transaction_type": "non-derivative""

Chief Development Officer financial

"officer_title": "CHIEF DEVELOPMENT OFFICER""

Chief development officer is the senior executive who leads a company's efforts to create and grow future revenue streams, whether by developing new products, forging partnerships, or running clinical and regulatory programs in research-focused businesses. Investors watch this role because the officer shapes the pipeline and execution that determine future sales and risk — like a head gardener planning and tending crops that will produce tomorrow’s harvest.

Form 4 Insider Transactions: What Each Field Means →

04/03/2026 - 09:25 PM

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)
04/02/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	04/02/2026		F		1,146⁽¹⁾	D	$109.6	94,294⁽²⁾	D
Common Stock	04/02/2026		F		1,831⁽³⁾	D	$109.6	92,463⁽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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

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 24, 2022.

2. Includes 43,483 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 14, 2024.

4. Includes 39,791 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)

Source: View Original Filing on SEC EDGAR

FAQ

What did GLAUKOS (GKOS) insider Tomas Navratil report in this Form 4?

Tomas Navratil reported a tax-related disposition of 2,977 Glaukos shares. The issuer withheld these shares at $109.60 each to satisfy tax obligations triggered by vesting restricted stock units granted in 2022 and 2024.

Was the GLAUKOS (GKOS) Form 4 a market sale by the insider?

No, the Form 4 shows tax-withholding dispositions, not open-market sales. Shares were withheld by Glaukos to cover Tomas Navratil’s tax obligations when his restricted stock units vested and delivered, a routine compensation-related event.

How many GLAUKOS (GKOS) shares were withheld for taxes in this filing?

A total of 2,977 Glaukos common shares were withheld for taxes. This comprised 1,146 shares and 1,831 shares, both valued at $109.60 per share, tied to vesting restricted stock units from 2022 and 2024 grants.

How many GLAUKOS (GKOS) shares does Tomas Navratil hold after this Form 4?

After the reported tax withholding, Tomas Navratil holds 92,463 Glaukos common shares directly. This figure reflects his post-transaction ownership and does not include additional unvested restricted stock units referenced in the footnotes.

What unvested restricted stock units does the GLAUKOS (GKOS) CDO still have?

The filing notes 43,483 restricted stock units from a March 24, 2022 grant and 39,791 restricted stock units from a March 14, 2024 grant. These units have not yet vested or been delivered to Tomas Navratil as of this filing.

Why did GLAUKOS (GKOS) withhold shares from Tomas Navratil’s RSU vesting?

Glaukos withheld shares to cover Tomas Navratil’s tax withholding obligations when his restricted stock units vested. Instead of paying cash, part of the vested shares—2,977 in total—were retained by the company at $109.60 per share.