GKOS's three largest insider shareholders as of September 09, 2026 are Thomas William Burns (Chairman Ceo, 1.21Mn shares), Chris M. Calcaterra (Chief Operating Officer, 181.59K shares), Tomas Navratil (Chief Development Officer, 73.89K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Thomas William Burns | Chairman Ceo | 73,026 | 1,141,593 | 1,214,619 | 66.0% | 03 Apr, 2026 |
| 2 | Chris M. Calcaterra | Chief Operating Officer | 181,594 | 0 | 181,594 | 9.9% | 28 Mar, 2022 |
| 3 | Tomas Navratil | Chief Development Officer | 73,890 | 0 | 73,890 | 4.0% | 01 Sep, 2026 |
| 4 | Joseph E Gilliam | President Coo | 72,588 | 0 | 72,588 | 3.9% | 13 Aug, 2026 |
| 5 | Mark J Foley | Director | 60,267 | 0 | 60,267 | 3.3% | 01 Jun, 2026 |
| 6 | David F Hoffmeister | Director | 49,549 | 0 | 49,549 | 2.7% | 01 Jun, 2026 |
| 7 | Alex R. Thurman | Svp Chief Financial Officer | 43,906 | 0 | 43,906 | 2.4% | 11 Aug, 2026 |
| 8 | Marc Stapley | Director | 39,327 | 0 | 39,327 | 2.1% | 01 Jun, 2026 |
| 9 | Gilbert H Kliman | Director | 37,406 | 0 | 37,406 | 2.0% | 20 Aug, 2026 |
| 10 | Denice Torres | Director | 24,212 | 0 | 24,212 | 1.3% | 01 Jun, 2026 |
| 11 | Leana Wen | Director | 21,092 | 0 | 21,092 | 1.1% | 03 Aug, 2026 |
| 12 | Aimee S Weisner | Director | 20,684 | 0 | 20,684 | 1.1% | 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 |
|---|---|---|---|---|---|---|---|---|
| 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 |
| 11 Aug, 2026 | Joseph E Gilliam | President Coo | Acquired M | 10,000 | $48.46 | $484.60K | 132,588 | Direct |
| 11 Aug, 2026 | Joseph E Gilliam | President Coo | Disposed S | 27,963 | $178.89 | $5.00Mn | 104,625 | Direct |
| 11 Aug, 2026 | Joseph E Gilliam | President Coo | Disposed S | 32,037 | $180.49 | $5.78Mn | 72,588 | Direct |
| 11 Aug, 2026 | Joseph E Gilliam | President Coo | Disposed M | 20,000 | $0.00 | $0 | 51,475 | Direct |
| 11 Aug, 2026 | Joseph E Gilliam | President Coo | Disposed M | 20,000 | $0.00 | $0 | 33,118 | Direct |
| 11 Aug, 2026 | Joseph E Gilliam | President Coo | Disposed M | 10,000 | $0.00 | $0 | 26,751 | Direct |
| 11 Aug, 2026 | Joseph E Gilliam | President Coo | Disposed M | 10,000 | $0.00 | $0 | 26,751 | Direct |
| 07 Aug, 2026 | Alex R. Thurman | Svp Chief Financial Officer | Acquired M | 20,000 | $33.81 | $676.20K | 63,906 | Direct |
| 07 Aug, 2026 | Alex R. Thurman | Svp Chief Financial Officer | Disposed S | 20,000 | $180.13 | $3.60Mn | 43,906 | Direct |
| 07 Aug, 2026 | Alex R. Thurman | Svp Chief Financial Officer | Disposed M | 20,000 | $0.00 | $0 | 0 | Direct |
| 31 Jul, 2026 | Leana Wen | Director | Disposed S | 525 | $167.63 | $88.01K | 21,092 | Direct |