GKOS Insider Sale: Tomas Navratil Disposes 5,142 Shares, Retains 75,469 (42,589 RSUs)

Rhea-AI Filing Summary

Glaukos Corp (GKOS) insider sale by Chief Development Officer. The filing shows Tomas Navratil sold a total of 5,142 shares on 09/11/2025 under a Rule 10b5-1 trading plan adopted June 12, 2025, at weighted average prices of $87.98 and $88.61. Following these transactions the reporting person beneficially owned 75,469 shares, which include 42,589 restricted stock units that have not vested or been delivered. The filing discloses the sales were executed in multiple trades with price ranges of $87.43–$88.43 and $88.44–$88.88 and states the reporter will provide full trade-by-trade details upon request.

Positive

• Sales executed under a Rule 10b5-1 plan, which provides an affirmative defense and suggests pre-planned, non-reactive trading
• Reporting person committed to provide detailed trade-level information on request, supporting transparency

Negative

• Insider sold 5,142 shares, reducing direct liquid holdings
• 42,589 of the reported 75,469 shares are restricted stock units that have not yet vested or been delivered, limiting currently vested ownership

Insights

Financial Analyst

TL;DR: Insider sold a small portion of holdings under a pre-established 10b5-1 plan; overall ownership still substantial but much is unvested.

The transactions total 5,142 shares sold on 09/11/2025 at weighted average prices near $88 under a Rule 10b5-1 plan adopted on June 12, 2025. Post-sale beneficial ownership is reported as 75,469 shares, however 42,589 of those are restricted stock units not yet vested or delivered. From a financial standpoint, these sales appear mechanistic given the 10b5-1 plan disclosure rather than an ad hoc disposition tied to company-specific news. The reporting person retains economic exposure to the company but a large portion of reported holdings remains subject to vesting, which limits immediate alignment benefits for shareholders.

Corporate Governance Expert

TL;DR: Use of a documented 10b5-1 plan reduces insider trading concerns but highlights that much reported ownership is restricted.

The filing properly discloses that the sales were effected pursuant to a Rule 10b5-1 trading plan, which provides an affirmative defense against insider trading claims if the plan was adopted in good faith. The report commits to provide trade-level detail on request, supporting transparency. Governance considerations include the fact that over half of the beneficially owned shares are restricted stock units that have not vested, which affects the director/officer's immediate skin in the game and could be relevant to assessing executive incentives.

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).

X

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 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)
	CHIEF DEVELOPMENT OFFICER

3. Date of Earliest Transaction (Month/Day/Year)
09/11/2025

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	09/11/2025		S(1)		3,194	D	$87.98(2)	77,417(3)	D
Common Stock	09/11/2025		S(1)		1,948	D	$88.61(4)	75,469(3)	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. The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 12, 2025.

2. This transaction was executed in multiple trades at prices ranging from $87.43 to $88.43. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

3. Includes 42,589 restricted stock units that have not yet vested or been delivered to the Reporting Person.

4. This transaction was executed in multiple trades at prices ranging from $88.44 to $88.88. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

	Diana Scherer, Attorney-in-Fact	09/12/2025
	** 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.

FAQ

What did GKOS insider Tomas Navratil sell on the Form 4?

The filing reports the sale of 5,142 shares of Glaukos common stock on 09/11/2025, executed in multiple trades under a 10b5-1 plan.

At what prices were the GKOS shares sold by the reporting person?

The sales were executed at weighted average prices of $87.98 and $88.61; trade price ranges were $87.43–$88.43 and $88.44–$88.88.

How many Glaukos shares does the reporting person beneficially own after the sale?

Following the reported transactions the reporting person beneficially owned 75,469 shares, which include 42,589 restricted stock units not yet vested or delivered.

Was the sale part of a trading plan?

Yes. The sales were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 12, 2025.

Will additional transaction-level details be available?

The filer states they will provide, upon request to the SEC staff, the issuer, or a security holder, full information regarding the number of shares and prices at which the transactions were effected.