Glaukos Corp
Ownership
Ownership Structure
Who owns Glaukos Corp (GKOS)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 96.3% of the shares are freely tradable; institutional investors hold 102.1%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 16.17 | 9,540,056 | +5.0 | 06/30/2026 |
| HHG PLC | 9.07 | 5,348,395 | +77.2 | 03/31/2026 |
| Jupiter Topco LLC | 8.24 | 4,862,894 | +0.0 | 06/30/2026 |
| Vanguard Portfolio Management, LLC | 5.63 | 3,321,839 | +3.5 | 06/30/2026 |
| PRIMECAP Management Company | 5.16 | 3,040,705 | -9.8 | 06/30/2026 |
| Vanguard Capital Management, LLC | 4.33 | 2,551,132 | +1.7 | 06/30/2026 |
| State Street Corp | 3.93 | 2,315,568 | +6.1 | 06/30/2026 |
| Millennium Management LLC | 2.68 | 1,581,016 | +34.7 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| iShares Core S&P Small-Cap ETF | 5.96 | 3,513,860 | +0.0 | 09/30/2026 |
| Vanguard MStar Total Stk Mkt Idx Invest | 3.01 | 1,778,021 | +0.3 | 09/30/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Gilliam Joseph E | PRESIDENT & COO | 72,588 | 17,319,497 $ | Aug 11, 2026 | direct |
| Navratil Tomas | CHIEF DEVELOPMENT OFFICER | 69,291 | 16,532,833 $ | Oct 5, 2026 | direct |
| Thurman Alex R. | SVP & CHIEF FINANCIAL OFFICER | 43,906 | 10,475,972 $ | Aug 7, 2026 | direct |
| Kliman Gilbert H | Director | 37,406 | 8,925,072 $ | Aug 19, 2026 | direct |
| Wen Leana | Director | 21,092 | 5,032,551 $ | Jul 31, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Oct 5, 2026 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Sell | 312 | 165.60 | 51,667 |
| Oct 5, 2026 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Sell | 327 | 164.78 | 53,883 |
| Oct 5, 2026 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Sell | 888 | 163.93 | 145,570 |
| Sep 25, 2026 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Sell | 1,083 | 154.88 | 167,735 |
| Sep 25, 2026 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Sell | 229 | 154.24 | 35,321 |
| Sep 25, 2026 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Sell | 136 | 152.71 | 20,769 |
| Sep 25, 2026 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Sell | 167 | 151.70 | 25,334 |
| Sep 16, 2026 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Sell | 4 | 172.00 | 688 |
| Sep 16, 2026 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Sell | 234 | 170.95 | 40,002 |
| Sep 16, 2026 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Sell | 120 | 168.38 | 20,206 |
| Sep 16, 2026 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Sell | 460 | 167.32 | 76,967 |
| Sep 16, 2026 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Sell | 191 | 166.20 | 31,744 |
| Sep 16, 2026 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Sell | 345 | 164.60 | 56,787 |
| Sep 16, 2026 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Sell | 103 | 163.20 | 16,810 |
| Aug 28, 2026 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Sell | 10 | 182.50 | 1,825 |
| Aug 28, 2026 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Sell | 6,091 | 181.19 | 1,103,628 |
| Aug 28, 2026 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Sell | 7,643 | 180.25 | 1,377,651 |
| Aug 19, 2026 | Kliman Gilbert H | Director | Sell | 2,500 | 190.00 | 475,000 |
| Aug 19, 2026 | Kliman Gilbert H | Director | Other | 2,500 | 25.77 | 64,425 |
| Aug 11, 2026 | Gilliam Joseph E | PRESIDENT & COO | Sell | 32,037 | 180.49 | 5,782,358 |
| Aug 11, 2026 | Gilliam Joseph E | PRESIDENT & COO | Sell | 27,963 | 178.89 | 5,002,301 |
| Aug 11, 2026 | Gilliam Joseph E | PRESIDENT & COO | Other | 20,000 | 55.18 | 1,103,600 |
| Aug 11, 2026 | Gilliam Joseph E | PRESIDENT & COO | Other | 10,000 | 48.46 | 484,600 |
| Aug 7, 2026 | Thurman Alex R. | SVP & CHIEF FINANCIAL OFFICER | Sell | 20,000 | 180.13 | 3,602,600 |
| Aug 7, 2026 | Thurman Alex R. | SVP & CHIEF FINANCIAL OFFICER | Other | 20,000 | 33.81 | 676,200 |
| Jul 31, 2026 | Wen Leana | Director | Sell | 525 | 167.63 | 88,006 |
| Jul 16, 2026 | Thurman Alex R. | SVP & CHIEF FINANCIAL OFFICER | Sell | 10,000 | 160.00 | 1,600,000 |
| Jul 16, 2026 | Thurman Alex R. | SVP & CHIEF FINANCIAL OFFICER | Other | 10,000 | 38.68 | 386,800 |
| Jul 9, 2026 | Thurman Alex R. | SVP & CHIEF FINANCIAL OFFICER | Sell | 10,000 | 155.00 | 1,550,000 |
| Jul 9, 2026 | Thurman Alex R. | SVP & CHIEF FINANCIAL OFFICER | Other | 10,000 | 38.68 | 386,800 |
| Jul 6, 2026 | Thurman Alex R. | SVP & CHIEF FINANCIAL OFFICER | Sell | 10,000 | 150.00 | 1,500,000 |
| Jul 6, 2026 | Thurman Alex R. | SVP & CHIEF FINANCIAL OFFICER | Other | 10,000 | 38.68 | 386,800 |
| Jul 1, 2026 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Sell | 716 | 139.06 | 99,567 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: November 2, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.