[Form 4] GLAUKOS Corp Insider Trading Activity

Rhea-AI Filing Summary

Glaukos insider sale disclosed: Tomas Navratil, Chief Development Officer, reported multiple dispositions of Glaukos common stock on September 22-23, 2025. The sales were effected pursuant to a Rule 10b5-1 trading plan adopted June 12, 2025. Transaction prices ranged from $82.20 to $85.11 (weighted averages reported per block). After the reported transactions, the reporting person beneficially owned 75,907 shares, which include unvested restricted stock units (the filing notes 42,535 RSUs still unvested). Some shares were withheld to satisfy tax withholding upon RSU vesting.

Positive

• Sales executed under a Rule 10b5-1 trading plan, providing an established pre-clearance mechanism and increased disclosure clarity
• Filing discloses weighted-average price ranges and RSU tax-withholding, offering transparency about the transactions and resulting holdings

Negative

• Officer disposed of multiple blocks of common stock on September 22-23, 2025, reducing immediate direct ownership to 75,907 shares
• Significant portion of reported position consists of unvested RSUs (the filing states 42,535 RSUs still unvested), which may affect near-term share delivery and withholding activity

Insights

Securities Analyst

TL;DR: Insider executed multiple Rule 10b5-1 sales in late September; reporting shows retained beneficial ownership of 75,907 shares including unvested RSUs.

The Form 4 documents routine dispositions by an officer under a pre-established trading plan adopted June 12, 2025, with trades executed September 22-23, 2025 at weighted average prices reported for each block between $82.20 and $85.11. The filing discloses that a portion of the position consists of restricted stock units not yet vested and that shares were withheld for tax withholding related to RSU delivery. This is a standard Section 16 disclosure and does not by itself provide operational or financial guidance about the issuer.

Corporate Governance Expert

TL;DR: Disclosure aligns with governance best practices: sales under a 10b5-1 plan and tax-withholding events are explicitly described.

The report clearly states the 10b5-1 plan adoption date and provides weighted-average price ranges for executed trades, plus details on RSUs and withholding. From a governance and compliance perspective, the filing meets transparency expectations for insider trading disclosures. No amendments or unexplained events are presented.

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
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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).

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)
09/22/2025

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	09/22/2025		S(1)		23	D	$82.79(2)	76,884(3)	D
Common Stock	09/22/2025		S(1)		218	D	$83.76(4)	76,666(3)	D
Common Stock	09/22/2025		S(1)		276	D	$84.7(5)	76,390(3)	D
Common Stock	09/23/2025		F		483(6)	D	$84.69	75,907(7)	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 $82.20 to $82.96. 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 43,509 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 $83.22 to $84.19. 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.

5. This transaction was executed in multiple trades at prices ranging from $84.35 to $85.11. 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.

6. 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.

7. Includes 42,535 restricted stock units that have not yet vested or been delivered to the Reporting Person.

	Diana Scherer, Attorney-in-Fact	09/24/2025
	** 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 insider transactions did GKOS report for Tomas Navratil?

The Form 4 reports multiple dispositions of Glaukos common stock by Tomas Navratil on September 22-23, 2025, executed under a 10b5-1 trading plan adopted June 12, 2025.

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

The filing discloses weighted-average execution prices for the trade blocks, with trade prices ranging from $82.20 to $85.11 across the reported transactions.

How many GKOS shares does the reporting person beneficially own after the transactions?

Following the reported transactions, the reporting person beneficially owned 75,907 shares according to the Form 4.

Does the Form 4 mention restricted stock units (RSUs)?

Yes. The filing states the reported beneficial ownership includes unvested RSUs and specifies 42,535 (or 43,509 in a different line) RSUs in the explanations; it also notes shares were withheld to satisfy tax withholding upon RSU vesting.

Were these sales routine or part of a special transaction?

The Form 4 states the sales were effected pursuant to a pre-established Rule 10b5-1 trading plan, indicating planned, routine dispositions under that plan.