GLAUKOS (GKOS) President & COO sells 19,573 shares in open-market trade

Rhea-AI Filing Summary

GLAUKOS Corp executive Joseph E. Gilliam, the company’s President and COO, reported an open-market sale of 19,573 shares of common stock at a price of $143.54 per share.

After this transaction, he directly held 73,419 shares, which includes 43,925 restricted stock units that have not yet vested or been delivered.

Insider Trade Summary

Net Seller: 19,573 shares ($2,809,508)

Net Sell 1 txn

Insider Gilliam Joseph E

Role PRESIDENT & COO

Sold 19,573 shs ($2.81M)

Type	Security	Shares	Price	Value
Sale	Common Stock	19,573	$143.54	$2.81M

Holdings After Transaction: Common Stock — 73,419 shares (Direct, null)

Footnotes (1)

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Key Figures

Shares sold: 19,573 shares Sale price: $143.54 per share Shares held after sale: 73,419 shares +1 more

4 metrics

Shares sold 19,573 shares Open-market sale on May 1, 2026

Sale price $143.54 per share Price for the 19,573 sold shares

Shares held after sale 73,419 shares Direct holdings following transaction, including RSUs

Unvested RSUs 43,925 units Restricted stock units not yet vested or delivered

Key Terms

open-market sale, restricted stock units, Form 4

3 terms

open-market sale financial

"reported an open-market sale of 19,573 shares of common stock"

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

restricted stock units financial

"Includes 43,925 restricted stock units that have not yet vested"

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.

Form 4 regulatory

"This transaction was disclosed in a Form 4 insider filing"

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.

Form 4 Insider Transactions: What Each Field Means →

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)
05/01/2026

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	05/01/2026		S		19,573	D	$143.54	73,419(1)	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. Includes 43,925 restricted stock units that have not yet vested or been delivered to the Reporting Person.

	Diana Scherer, Attorney-in-Fact	05/04/2026
	** 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 insider transaction did GLAUKOS Corp (GKOS) report for Joseph E. Gilliam?

GLAUKOS Corp reported that President and COO Joseph E. Gilliam executed an open-market sale of 19,573 shares of common stock at $143.54 per share. This transaction was disclosed in a Form 4 insider filing with U.S. securities regulators.

At what price did Joseph E. Gilliam sell GLAUKOS (GKOS) shares?

Joseph E. Gilliam sold 19,573 GLAUKOS common shares at $143.54 per share in an open-market transaction. The price per share comes directly from the reported transaction details in the insider filing submitted to U.S. regulators.

How many GLAUKOS (GKOS) shares does Joseph E. Gilliam hold after this sale?

Following the reported sale, Joseph E. Gilliam directly holds 73,419 GLAUKOS shares. This figure includes both currently owned shares and restricted stock units, as specified in the filing’s post-transaction ownership information.

How many restricted stock units does Joseph E. Gilliam have in GLAUKOS (GKOS)?

Joseph E. Gilliam has 43,925 restricted stock units in GLAUKOS that have not yet vested or been delivered. These RSUs are included within his total reported direct holdings of 73,419 shares after the recent open-market sale.

What type of transaction did Joseph E. Gilliam execute in GLAUKOS (GKOS) stock?

The transaction reported for Joseph E. Gilliam was an open-market sale of common stock, coded as an “S” transaction. This indicates he sold 19,573 shares directly into the market at the reported price per share.