Glaukos Corporation (GKOS) Shareholders & Insider Trades
Glaukos shareholders at a glance
The largest holder of Glaukos stock is BlackRock Advisors LLC, with 9.0 million shares (15.77% of the company), worth about $1.62 billion as of September 25, 2026. The 10 largest holders together own 54.9%.
In Q2 2026, 384 institutional holdings reports listed shares worth $8.52 billion.
Insiders reported 75 transactions in the last two years: 27 sales worth $52.45 million and no purchases. The newest one on file is from May 14, 2026 (Kliman Gilbert H., Director).
Major holders as of September 25, 2026; quarterly totals from institutional holdings reports (latest Q2 2026); insider transactions on file through May 14, 2026.
Glaukos Corporation
Shareholders Summary
2026Q2
Ownership by Type
Geographic Distribution
Largest Glaukos shareholders
| Holder | Shares | % of company | Value |
|---|---|---|---|
| BlackRock Advisors LLC | 9.0 million | 15.77% | $1.6B |
| Janus Henderson Investors US LLC | 4.9 million | 8.48% | $873.0M |
| Vanguard Portfolio Management LLC | 3.3 million | 5.79% | $596.0M |
| PRIMECAP Management Co. | 3.0 million | 5.30% | $546.0M |
| Vanguard Capital Management LLC | 2.6 million | 4.45% | $458.0M |
| State Street Corporation | 2.3 million | 4.04% | $416.0M |
| Thomas Burns3.084 % | 1.8 million | 3.08% | $318.0M |
| Millennium Management LLC | 1.6 million | 2.76% | $284.0M |
| Holocene Advisors, LP | 1.5 million | 2.64% | $272.0M |
| Geode Capital Management LLC | 1.5 million | 2.55% | $263.0M |
As of September 25, 2026.
Glaukos institutional holdings by quarter
| Quarter | Reports | Shares | Value |
|---|---|---|---|
| Q2 2026 | 384 | – | $8.5B |
| Q1 2026 | 349 | 58.0 million | $6.3B |
| Q4 2025 | 346 | 57.1 million | $6.5B |
| Q3 2025 | 330 | 56.6 million | $4.6B |
| Q2 2025 | 317 | 61.2 million | $6.3B |
| Q1 2025 | 344 | 57.7 million | $5.7B |
| Q4 2024 | 345 | 57.1 million | $8.6B |
| Q3 2024 | 335 | 55.4 million | $7.2B |
Shares and value held by institutions that file quarterly holdings reports (options not included).
Glaukos insider trades
| Insider | Date | Title | Transaction | Value |
|---|---|---|---|---|
| Kliman Gilbert H. | May 14, 2026 | Director | Conversion of Exercise of derivative security at price 24.69 per share. | $123,450 |
| Kliman Gilbert H. | May 14, 2026 | Director | Sale at price 140.76 per share. | $703,800 |
| Kliman Gilbert H. | May 11, 2026 | Director | Conversion of Exercise of derivative security at price 24.69 per share. | $123,450 |
| Kliman Gilbert H. | May 11, 2026 | Director | Sale at price 135.00 per share. | $675,000 |
| Gilliam Joseph E. | May 1, 2026 | President | Sale at price 143.54 per share. | $2.8M |
| Wen Leana | May 1, 2026 | Director | Sale at price 143.35 per share. | $243,695 |
| Thurman Alex R. | Apr 30, 2026 | Chief Financial Officer | Conversion of Exercise of derivative security at price 38.68 per share. | $386,800 |
| Thurman Alex R. | Apr 30, 2026 | Chief Financial Officer | Sale at price 140.00 per share. | $1.4M |
| Navratil Tomas | Apr 10, 2026 | Officer | Sale at price 116.72 - 120.23 per share. | $246,175 |
| Burns Thomas William | Apr 1, 2026 | Chief Executive Officer | Stock Gift at price 0.00 per share. | – |
| Gilliam Joseph E. | Mar 25, 2026 | President | Stock Award(Grant) at price 0.00 per share. | – |
| Thurman Alex R. | Mar 25, 2026 | Chief Financial Officer | Stock Award(Grant) at price 0.00 per share. | – |
Newest 12 of 75 insider transactions in the last two years.
Questions and answers
Who owns the most Glaukos stock?
BlackRock Advisors LLC, with 15.77% of the company (as of September 25, 2026). Next: Janus Henderson Investors US LLC (8.48%) and Vanguard Portfolio Management LLC (5.79%).
How many institutions own Glaukos stock?
384 institutional holdings reports listed Glaukos shares in Q2 2026 worth $8.52 billion.
Are Glaukos insiders buying or selling the stock?
In the last two years insiders reported 27 sales and no purchases (75 transactions in all); the newest on file is from May 14, 2026.
