As of September 29, 2026, the three largest insider holders of GKOS are Thomas William Burns (Chairman Ceo, 1.14Mn shares), Chris M. Calcaterra (Chief Operating Officer, 181.59K shares), Joseph E Gilliam (President Coo, 72.59K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Chris M. Calcaterra | Chief Operating Officer | 181,594 | 0 | 181,594 | 26.3% | 28 Mar, 2022 |
| 2 | Joseph E Gilliam | President Coo | 72,588 | 0 | 72,588 | 10.5% | 13 Aug, 2026 |
| 3 | Tomas Navratil | Chief Development Officer | 70,818 | 0 | 70,818 | 10.3% | 28 Sep, 2026 |
| 4 | Thomas William Burns | Chairman Ceo | 68,967 | 0 | 68,967 | 10.0% | 29 Jun, 2026 |
| 5 | Mark J Foley | Director | 60,267 | 0 | 60,267 | 8.7% | 01 Jun, 2026 |
| 6 | David F Hoffmeister | Director | 49,549 | 0 | 49,549 | 7.2% | 01 Jun, 2026 |
| 7 | Alex R. Thurman | Svp Chief Financial Officer | 43,906 | 0 | 43,906 | 6.4% | 11 Aug, 2026 |
| 8 | Marc Stapley | Director | 39,327 | 0 | 39,327 | 5.7% | 01 Jun, 2026 |
| 9 | Gilbert H Kliman | Director | 37,406 | 0 | 37,406 | 5.4% | 20 Aug, 2026 |
| 10 | Denice Torres | Director | 24,212 | 0 | 24,212 | 3.5% | 01 Jun, 2026 |
| 11 | Leana Wen | Director | 21,092 | 0 | 21,092 | 3.1% | 03 Aug, 2026 |
| 12 | Aimee S Weisner | Director | 20,684 | 0 | 20,684 | 3.0% | 01 Jun, 2026 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 25 Sep, 2026 | Tomas Navratil | Chief Development Officer | Disposed S | 167 | $151.70 | $25.33K | 72,266 | Direct |
| 25 Sep, 2026 | Tomas Navratil | Chief Development Officer | Disposed S | 136 | $152.71 | $20.77K | 72,130 | Direct |
| 25 Sep, 2026 | Tomas Navratil | Chief Development Officer | Disposed S | 229 | $154.24 | $35.32K | 71,901 | Direct |
| 25 Sep, 2026 | Tomas Navratil | Chief Development Officer | Disposed S | 1,083 | $154.88 | $167.74K | 70,818 | Direct |
| 16 Sep, 2026 | Tomas Navratil | Chief Development Officer | Disposed S | 103 | $163.20 | $16.81K | 73,787 | Direct |
| 16 Sep, 2026 | Tomas Navratil | Chief Development Officer | Disposed S | 345 | $164.60 | $56.79K | 73,442 | Direct |
| 16 Sep, 2026 | Tomas Navratil | Chief Development Officer | Disposed S | 191 | $166.20 | $31.74K | 73,251 | Direct |
| 16 Sep, 2026 | Tomas Navratil | Chief Development Officer | Disposed S | 460 | $167.32 | $76.97K | 72,791 | Direct |
| 16 Sep, 2026 | Tomas Navratil | Chief Development Officer | Disposed S | 120 | $168.38 | $20.21K | 72,671 | Direct |
| 16 Sep, 2026 | Tomas Navratil | Chief Development Officer | Disposed S | 234 | $170.95 | $40.00K | 72,437 | Direct |
| 16 Sep, 2026 | Tomas Navratil | Chief Development Officer | Disposed S | 4 | $172.00 | $688 | 72,433 | Direct |
| 28 Aug, 2026 | Tomas Navratil | Chief Development Officer | Disposed S | 7,643 | $180.25 | $1.38Mn | 79,991 | Direct |
| 28 Aug, 2026 | Tomas Navratil | Chief Development Officer | Disposed S | 6,091 | $181.19 | $1.10Mn | 73,900 | Direct |
| 28 Aug, 2026 | Tomas Navratil | Chief Development Officer | Disposed S | 10 | $182.50 | $1.83K | 73,890 | Direct |
| 19 Aug, 2026 | Gilbert H Kliman | Director | Acquired M | 2,500 | $25.77 | $64.43K | 39,906 | Direct |
| 19 Aug, 2026 | Gilbert H Kliman | Director | Disposed S | 2,500 | $190.00 | $475.00K | 37,406 | Direct |
| 19 Aug, 2026 | Gilbert H Kliman | Director | Disposed M | 2,500 | $0.00 | $0 | 12,500 | Direct |
| 11 Aug, 2026 | Joseph E Gilliam | President Coo | Acquired M | 10,000 | $48.46 | $484.60K | 82,588 | Direct |
| 11 Aug, 2026 | Joseph E Gilliam | President Coo | Acquired M | 20,000 | $55.18 | $1.10Mn | 102,588 | Direct |
| 11 Aug, 2026 | Joseph E Gilliam | President Coo | Acquired M | 20,000 | $55.18 | $1.10Mn | 122,588 | Direct |