GKOS (Glaukos Corporation)

Insider Trading Activity

Every open-market purchase and sale reported by GKOS officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.

Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.

Form 4 Filings
50
most recent
Open-Market Buys
0
code P
Sales
7
code S
Reporting Insiders
25
current holders
GKOS — Recent Form 4 Transactions (latest 2026-09-01)
FiledInsiderRole TypeSharesValue
2026-09-01 Tomas Navratil CHIEF DEVELOPMENT OFFICER Sell
2026-08-20 Gilbert H Kliman Director MIXED
2026-08-13 Joseph E Gilliam PRESIDENT & COO MIXED
2026-08-11 Alex R. Thurman SVP & CHIEF FINANCIAL OFFICER MIXED
2026-08-03 LEANA WEN Director Sell
2026-07-21 Alex R. Thurman SVP & CHIEF FINANCIAL OFFICER MIXED
2026-07-13 Alex R. Thurman SVP & CHIEF FINANCIAL OFFICER MIXED
2026-07-08 Tomas Navratil CHIEF DEVELOPMENT OFFICER Sell
2026-07-08 Alex R. Thurman SVP & CHIEF FINANCIAL OFFICER MIXED
2026-06-29 Joseph E Gilliam PRESIDENT & COO F
2026-06-29 Tomas Navratil CHIEF DEVELOPMENT OFFICER F
2026-06-29 Thomas William Burns CHAIRMAN & CEO F
2026-06-23 Mark J Foley Director A
2026-06-23 Gilbert H Kliman Director A
2026-06-23 Denice Torres Director A
2026-06-23 David F Hoffmeister Director A
2026-06-23 LEANA WEN Director A
2026-06-23 Marc Stapley Director A
2026-06-23 AIMEE S WEISNER Director A
2026-06-18 Tomas Navratil CHIEF DEVELOPMENT OFFICER Sell
2026-06-01 LEANA WEN Director A
2026-06-01 Gilbert H Kliman Director A
2026-06-01 AIMEE S WEISNER Director A
2026-06-01 Marc Stapley Director A
2026-06-01 Mark J Foley Director A
2026-06-01 David F Hoffmeister Director A
2026-06-01 Denice Torres Director A
2026-05-28 David F Hoffmeister Director M
2026-05-18 Gilbert H Kliman Director MIXED
2026-05-13 Gilbert H Kliman Director MIXED
2026-05-04 Joseph E Gilliam PRESIDENT & COO Sell
2026-05-04 LEANA WEN Director Sell
2026-05-04 Alex R. Thurman SVP & CHIEF FINANCIAL OFFICER MIXED
2026-04-14 Tomas Navratil CHIEF DEVELOPMENT OFFICER Sell
2026-04-03 Joseph E Gilliam PRESIDENT & COO F
2026-04-03 Alex R. Thurman SVP & CHIEF FINANCIAL OFFICER F
2026-04-03 Thomas William Burns CHAIRMAN & CEO MIXED
2026-04-03 Tomas Navratil CHIEF DEVELOPMENT OFFICER F
2026-04-02 Tomas Navratil CHIEF DEVELOPMENT OFFICER F
2026-03-27 Tomas Navratil CHIEF DEVELOPMENT OFFICER A
2026-03-27 Alex R. Thurman SVP & CHIEF FINANCIAL OFFICER MIXED
2026-03-27 Thomas William Burns CHAIRMAN & CEO A
2026-03-27 Joseph E Gilliam PRESIDENT & COO A
2026-03-25 Alex R. Thurman SVP & CHIEF FINANCIAL OFFICER MIXED
2026-03-25 Joseph E Gilliam PRESIDENT & COO F
2026-03-25 Tomas Navratil CHIEF DEVELOPMENT OFFICER F
2026-03-25 Thomas William Burns CHAIRMAN & CEO F
2026-03-19 Tomas Navratil CHIEF DEVELOPMENT OFFICER MIXED
2026-03-19 Joseph E Gilliam PRESIDENT & COO F
2026-03-19 Alex R. Thurman SVP & CHIEF FINANCIAL OFFICER MIXED
GKOS — Current Insider Holders
InsiderRole Shares HeldValue
10%+ Owner 3,209,812
10%+ Owner 2,972,501
10%+ Owner 2,603,362
10%+ Owner 2,603,362
10%+ Owner 2,077,660
Director 1,628,111
Director 1,249,793
10%+ Owner 876,083
CFO & Treasurer 213,701
CHAIRMAN & CEO 188,967
Chief Operating Officer 181,594
Director 159,798
10%+ Owner 132,483
PRESIDENT & COO 122,588
Director 87,725
CHIEF DEVELOPMENT OFFICER 73,890
Director 66,790
SVP & CHIEF FINANCIAL OFFICER 63,906
Director 60,267
Director 58,300
Director 54,177
46,804
Director 39,906
Director 39,327
Director 24,212
How to read Form 4 activity

Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.

Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.

Full filing history and per-insider positions are on the GKOS quote page; the site-wide leaderboard is on the insider transactions hub.