SEC Form 4 reporting owner

Navratil Tomas

Navratil Tomas has filed 35 Form 4 transactions reported between December 11, 2025 and September 16, 2026, as CHIEF DEVELOPMENT OFFICER of GLAUKOS Corp.

Name as filed: Navratil Tomas

Open-market buys, 24 mo

None

reported

Open-market sales, 24 mo

$3.4M

19 lines

Companies

with Form 4 filings

Latest transaction

Sep 16, 2026

transaction date

Roles and reported holdings

GKOSGLAUKOS Corp
Dec 11, 2025 – Sep 16, 2026
CHIEF DEVELOPMENT OFFICER
Held directly72,433 sh as of Sep 16, 2026 · Form 4
24 months: $3.4M sold

Transaction history

All 35 reported transactions, newest first. Every row links to the Form 4 on SEC EDGAR.

Date	Company	Type	Shares	Price	Value	Owned after	Filing
Sep 16, 2026	GKOSCHIEF DEVELOPMENT OFFICER	Open-market saleCode S · direct	4	$172.00	$688@ $172.00	72,433	Form 4
Sep 16, 2026	GKOSCHIEF DEVELOPMENT OFFICER	Open-market saleCode S · direct	234	$170.95	$40K@ $170.95	72,437	Form 4
Sep 16, 2026	GKOSCHIEF DEVELOPMENT OFFICER	Open-market saleCode S · direct	120	$168.38	$20K@ $168.38	72,671	Form 4
Sep 16, 2026	GKOSCHIEF DEVELOPMENT OFFICER	Open-market saleCode S · direct	460	$167.32	$77K@ $167.32	72,791	Form 4
Sep 16, 2026	GKOSCHIEF DEVELOPMENT OFFICER	Open-market saleCode S · direct	191	$166.20	$32K@ $166.20	73,251	Form 4
Sep 16, 2026	GKOSCHIEF DEVELOPMENT OFFICER	Open-market saleCode S · direct	345	$164.60	$57K@ $164.60	73,442	Form 4
Sep 16, 2026	GKOSCHIEF DEVELOPMENT OFFICER	Open-market saleCode S · direct	103	$163.20	$17K@ $163.20	73,787	Form 4
Aug 28, 2026	GKOSCHIEF DEVELOPMENT OFFICER	Open-market saleCode S · direct	10	$182.50	$2K@ $182.50	73,890	Form 4
Aug 28, 2026	GKOSCHIEF DEVELOPMENT OFFICER	Open-market saleCode S · direct	6,091	$181.19	$1.1M@ $181.19	73,900	Form 4
Aug 28, 2026	GKOSCHIEF DEVELOPMENT OFFICER	Open-market saleCode S · direct	7,643	$180.25	$1.4M@ $180.25	79,991	Form 4
Jul 1, 2026	GKOSCHIEF DEVELOPMENT OFFICER	Open-market saleCode S · direct	716	$139.06	$100K@ $139.06	87,634	Form 4
Jun 25, 2026	GKOSCHIEF DEVELOPMENT OFFICER	Shares withheld for tax or exercise priceCode F · direct	483	$142.57	$69K@ $142.57	88,350	Form 4
Jun 16, 2026	GKOSCHIEF DEVELOPMENT OFFICER	Open-market saleCode S · direct	1,537	$130.68	$201K@ $130.68	88,833	Form 4
Apr 10, 2026	GKOSCHIEF DEVELOPMENT OFFICER	Open-market saleCode S · direct	32	$120.23	$4K@ $120.23	90,370	Form 4
Apr 10, 2026	GKOSCHIEF DEVELOPMENT OFFICER	Open-market saleCode S · direct	614	$119.35	$73K@ $119.35	90,402	Form 4
Apr 10, 2026	GKOSCHIEF DEVELOPMENT OFFICER	Open-market saleCode S · direct	210	$117.45	$25K@ $117.45	91,016	Form 4
Apr 10, 2026	GKOSCHIEF DEVELOPMENT OFFICER	Open-market saleCode S · direct	1,237	$116.72	$144K@ $116.72	91,226	Form 4
Apr 2, 2026	GKOSCHIEF DEVELOPMENT OFFICER	Shares withheld for tax or exercise priceCode F · direct	1,831	$109.60	$201K@ $109.60	92,463	Form 4
Apr 2, 2026	GKOSCHIEF DEVELOPMENT OFFICER	Shares withheld for tax or exercise priceCode F · direct	1,146	$109.60	$126K@ $109.60	94,294	Form 4
Mar 31, 2026	GKOSCHIEF DEVELOPMENT OFFICER	Shares withheld for tax or exercise priceCode F · direct	5,798	$109.60	$635K@ $109.60	95,440	Form 4
Mar 25, 2026	GKOSCHIEF DEVELOPMENT OFFICER	Grant or awardCode A · direct	12,774	—	—	101,238	Form 4
Mar 25, 2026	GKOSCHIEF DEVELOPMENT OFFICER	Grant or awardCode A · direct	3,692	—	—	88,464	Form 4
Mar 25, 2026	GKOSCHIEF DEVELOPMENT OFFICER	Grant or awardCode A · direct	11,693	—	—	84,772	Form 4
Mar 25, 2026	GKOSCHIEF DEVELOPMENT OFFICER	Grant or awardCode A · direct	4,622	—	—	73,079	Form 4
Mar 24, 2026	GKOSCHIEF DEVELOPMENT OFFICER	Shares withheld for tax or exercise priceCode F · direct	2,546	$105.23	$268K@ $105.23	68,457	Form 4
Mar 23, 2026	GKOSCHIEF DEVELOPMENT OFFICER	Shares withheld for tax or exercise priceCode F · direct	2,628	$106.84	$281K@ $106.84	71,003	Form 4
Mar 16, 2026	GKOSCHIEF DEVELOPMENT OFFICER	Open-market saleCode S · direct	272	$99.05	$27K@ $99.05	73,631	Form 4
Mar 16, 2026	GKOSCHIEF DEVELOPMENT OFFICER	Open-market saleCode S · direct	299	$98.21	$29K@ $98.21	73,903	Form 4
Mar 16, 2026	GKOSCHIEF DEVELOPMENT OFFICER	Open-market saleCode S · direct	460	$97.33	$45K@ $97.33	74,202	Form 4
Mar 16, 2026	GKOSCHIEF DEVELOPMENT OFFICER	Shares withheld for tax or exercise priceCode F · direct	958	$98.94	$95K@ $98.94	74,662	Form 4
Mar 13, 2026	GKOSCHIEF DEVELOPMENT OFFICER	Shares withheld for tax or exercise priceCode F · direct	1,074	$97.02	$104K@ $97.02	75,620	Form 4
Mar 5, 2026	GKOSCHIEF DEVELOPMENT OFFICER	Shares withheld for tax or exercise priceCode F · direct	361	$112.10	$40K@ $112.10	76,694	Form 4
Feb 24, 2026	GKOSCHIEF DEVELOPMENT OFFICER	Shares withheld for tax or exercise priceCode F · direct	396	$119.17	$47K@ $119.17	77,055	Form 4
Dec 30, 2025	GKOSCHIEF DEVELOPMENT OFFICER	Shares withheld for tax or exercise priceCode F · direct	510	$114.24	$58K@ $114.24	77,451	Form 4
Dec 11, 2025	GKOSCHIEF DEVELOPMENT OFFICER	Grant or awardCode A · direct	2,054	—	—	77,961	Form 4

How this page is built

Every row comes from a Form 4 filed with the SEC, which officers, directors and holders of more than 10% of a company’s stock must file within two business days of a trade. Transactions are grouped by the reporting owner’s name as filed (spacing, capitals and punctuation ignored); two different people filing under an identical name would appear together, and one person filing under two spellings appears on two pages.

Open-market totals count code P purchases and code S sales over the last 24 months. The same trade reported on more than one filing is counted once; when another owner (for example a fund and its general partner) reports the identical trade, they are listed beside it. Holdings are the shares owned after the latest purchase, sale, gift or tax-withholding line, shown separately for direct and indirect ownership; an indirect figure is one holding line, not a total across every trust or entity.

This page describes what was filed with the SEC; it is not investment advice or a recommendation to buy or sell any security.