🕵️ Glaukos Corp ($GKOS)
SEC insider & ownership activity, last 12 months · CIK 1192448 · every row links its SEC filing
Over the last 12 months insiders sold $51.6M with no open-market buying against it. Burns Thomas William sold $31.6M through a 10b5-1 trading plan in 2 lots (Jan). 2 planned sales are pending, the largest $1.5M (Alex R. Thurman). No red-flag 8-Ks in the window.
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Monthly net open-market insider flow, last 12 months (up = net buying)
Insider flow
0 buyers, $0 (0 lots) · 8 sellers, $51.6M (44 lots)
| Insider | Buys | Bought | Sells | Sold | Last |
|---|---|---|---|---|---|
| Burns Thomas William | 0 | – | 2 | $31.6M | Jan 16, 2026 |
| Alex R. Thurman | 0 | – | 8 | $6.6M | Jul 16, 2026 |
| Joseph E. Gilliam | 0 | – | 7 | $6.5M | May 1, 2026 |
| Stapley Marc | 0 | – | 5 | $1.9M | Jan 22, 2026 |
| Gilbert H. Kliman | 0 | – | 3 | $1.9M | May 14, 2026 |
| Aimee S. Weisner | 0 | – | 4 | $1.8M | Feb 19, 2026 |
| Navratil Tomas | 0 | – | 14 | $1.1M | Jul 1, 2026 |
| Wen Leana | 0 | – | 1 | $244K | May 1, 2026 |
5%+ holders
| Holder | Stake | Class | Schedule | Event | |
|---|---|---|---|---|---|
| Blackrock, Inc. | 14.4% | 13G | Apr 29, 2025 | filing ↗ | |
| Janus Henderson Group PLC | 9.2% | 13G | May 15, 2026 | filing ↗ | |
| Primecap Management CO/CA/ | 5.9% | 13G | Feb 11, 2026 | filing ↗ | |
| Vanguard Portfolio Management | 5.6% | 13G | Apr 29, 2026 | filing ↗ | |
| Wellington Management Company LLP | 5.4% | 13G | Aug 12, 2025 | filing ↗ | |
| Vanguard Capital Management | 5.1% | 13G | Apr 29, 2026 | filing ↗ |
Planned insider sales (Form 144)
| Seller | Planned | Approx. sale date | |
|---|---|---|---|
| Alex R. Thurman | $1.6M | Jul 16, 2026 | filing ↗ |
| Alex R. Thurman | $1.6M | Jul 9, 2026 | filing ↗ |
| Alex R. Thurman | $1.5M | Jul 6, 2026 | filing ↗ |
| Navratil Tomas | $100K | Jul 1, 2026 | filing ↗ |
| Navratil Tomas | $201K | Jun 16, 2026 | filing ↗ |
| Gilbert H. Kliman | $704K | May 14, 2026 | filing ↗ |
| Gilbert H. Kliman | $675K | May 11, 2026 | filing ↗ |
| Wen Leana | $247K | May 1, 2026 | filing ↗ |
| Joseph E. Gilliam | $2.8M | May 1, 2026 | filing ↗ |
| Alex R. Thurman | $1.4M | Apr 30, 2026 | filing ↗ |
| Navratil Tomas | $246K | Apr 10, 2026 | filing ↗ |
| Alex R. Thurman | $267K | Mar 25, 2026 | filing ↗ |
| Alex R. Thurman | $160K | Mar 24, 2026 | filing ↗ |
| Alex R. Thurman | $62K | Mar 17, 2026 | filing ↗ |
| Navratil Tomas | $101K | Mar 16, 2026 | filing ↗ |
| Aimee S. Weisner | $1.8M | Feb 19, 2026 | filing ↗ |
| Joseph E. Gilliam | $1.3M | Jan 22, 2026 | filing ↗ |
| Stapley Marc | $1.9M | Jan 22, 2026 | filing ↗ |
| Joseph E. Gilliam | $561K | Jan 21, 2026 | filing ↗ |
| Burns Thomas William | $21.5M | Jan 16, 2026 | filing ↗ |
| Burns Thomas William | $10.1M | Jan 8, 2026 | filing ↗ |
| Gilbert H. Kliman | $536K | Dec 9, 2025 | filing ↗ |
| Alex R. Thurman | $33K | Nov 25, 2025 | filing ↗ |
| Joseph E. Gilliam | $1.7M | Nov 18, 2025 | filing ↗ |
| Navratil Tomas | $44K | Sep 22, 2025 | filing ↗ |
| Navratil Tomas | $454K | Sep 11, 2025 | filing ↗ |
Material events (8-K)
| Item | Event date | |
|---|---|---|
| Earnings (2.02) | Jul 29, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Jul 29, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jul 29, 2026 | filing ↗ |
| Shareholder vote (5.07) | May 28, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | May 4, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 4, 2026 | filing ↗ |
| Earnings (2.02) | Apr 29, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Apr 29, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Apr 29, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Mar 2, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Mar 2, 2026 | filing ↗ |
| Earnings (2.02) | Feb 17, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Feb 17, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Feb 17, 2026 | filing ↗ |
| Earnings (2.02) | Jan 13, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Jan 13, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jan 13, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Nov 10, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 10, 2025 | filing ↗ |
| Earnings (2.02) | Oct 29, 2025 | filing ↗ |
| Reg FD disclosure (7.01) | Oct 29, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Oct 29, 2025 | filing ↗ |
| Reg FD disclosure (7.01) | Aug 12, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Aug 12, 2025 | filing ↗ |
| Earnings (2.02) | Jul 30, 2025 | filing ↗ |
| Reg FD disclosure (7.01) | Jul 30, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jul 30, 2025 | filing ↗ |