Glaukos Corporation (GKOS) has 16 known insider and institutional holders on record. The largest holder is Calcaterra Chris M. with 181,594 shares. Other notable holders include Gilliam Joseph E and Navratil Tomas.
Over the last 12 months, insiders have made 87 transactions in GKOS stock — 33 buys (valued at $18.93M) and 6 sells (valued at $2.06M). Insider buying has outpaced selling during this period, which may signal confidence in the company's prospects.
GKOS Insider Ownership
Top Holder
Calcaterra Chris M.
181,594 shares
Buys (12 mo)
33
$18.93M value
Sells (12 mo)
6
$2.06M value
12-Month Transaction Activity
Top Insider Holders
| # |
Name |
Role |
Shares Owned |
Last Filed |
Relative Size |
| 1 |
Calcaterra Chris M. |
Chief Operating Officer |
181,594 |
2022-03-28 |
|
| 2 |
Gilliam Joseph E |
President & COO |
92,992 |
2026-04-03 |
|
| 3 |
Navratil Tomas |
Chief Development Officer |
92,463 |
2026-04-03 |
|
| 4 |
Burns Thomas William |
Chairman & CEO |
82,963 |
2026-04-03 |
|
| 5 |
Foley Mark J |
Director |
58,389 |
2026-01-07 |
|
| 6 |
Thurman Alex R. |
SVP & Chief Financial Officer |
43,681 |
2026-04-03 |
|
| 7 |
Stapley Marc |
Director |
37,449 |
2026-01-07 |
|
| 8 |
Kliman Gilbert H |
Director |
35,528 |
2026-01-07 |
|
| 9 |
Hoffmeister David F |
Director |
32,671 |
2026-01-07 |
|
| 10 |
Torres Denice |
Director |
22,334 |
2026-01-07 |
|
| 11 |
Wen Leana |
Director |
21,439 |
2026-01-07 |
|
| 12 |
Weisner Aimee S |
Director |
19,786 |
2026-01-07 |
|
| 13 |
Link William J Phd |
Director |
17,821 |
2021-06-07 |
|
| 14 |
Orbimed Advisors Llc |
Director |
3,511 |
2018-03-06 |
|
| 15 |
Silverstein Jonathan |
Director |
3,511 |
2018-03-06 |
|
| 16 |
Harrison Richard L |
Officer |
1,388 |
2017-01-13 |
|
Recent Transactions (last 12 months)
| Date |
Name |
Role |
Type |
Shares |
Price |
Value |
| 2026-04-02 |
Thurman Alex R. |
SVP & Chief Financial Officer |
Tax Withholding of RSU |
1,589 |
$109.60 |
$174.15K |
| 2026-04-02 |
Navratil Tomas |
Chief Development Officer |
Tax Withholding of RSU |
1,831 |
$109.60 |
$200.68K |
| 2026-04-02 |
Gilliam Joseph E |
President & COO |
Tax Withholding of RSU |
3,169 |
$109.60 |
$347.32K |
| 2026-04-02 |
Burns Thomas William |
Chairman & CEO |
Tax Withholding of RSU |
7,468 |
$109.60 |
$818.49K |
| 2026-04-01 |
Burns Thomas William |
Chairman & CEO |
Gift (Given) |
180,308 |
- |
- |
| 2026-03-31 |
Navratil Tomas |
Chief Development Officer |
Tax Withholding of RSU |
5,798 |
$109.60 |
$635.46K |
| 2026-03-25 |
Thurman Alex R. |
SVP & Chief Financial Officer |
RSU Award |
20,515 |
$109.60 |
$2.25M |
| 2025-03-25 |
Thurman Alex R. |
SVP & Chief Financial Officer |
RSU Award |
19,601 |
$48.46 |
$949.86K |
| 2026-03-25 |
Navratil Tomas |
Chief Development Officer |
RSU Award |
4,622 |
- |
- |
| 2026-03-25 |
Gilliam Joseph E |
President & COO |
RSU Award |
36,751 |
$48.46 |
$1.78M |
| 2026-03-25 |
Burns Thomas William |
Chairman & CEO |
RSU Award |
98,474 |
$109.60 |
$10.79M |
| 2026-03-24 |
Thurman Alex R. |
SVP & Chief Financial Officer |
Tax Withholding of RSU |
2,020 |
$105.23 |
$212.56K |
| 2026-03-23 |
Thurman Alex R. |
SVP & Chief Financial Officer |
Tax Withholding of RSU |
1,230 |
$106.84 |
$131.41K |
| 2026-03-24 |
Navratil Tomas |
Chief Development Officer |
Tax Withholding of RSU |
2,546 |
$105.23 |
$267.92K |
| 2026-03-23 |
Navratil Tomas |
Chief Development Officer |
Tax Withholding of RSU |
2,628 |
$106.84 |
$280.78K |
| 2026-03-24 |
Gilliam Joseph E |
President & COO |
Tax Withholding of RSU |
7,388 |
$105.23 |
$777.44K |
| 2026-03-23 |
Gilliam Joseph E |
President & COO |
Tax Withholding of RSU |
2,804 |
$106.84 |
$299.58K |
| 2026-03-24 |
Burns Thomas William |
Chairman & CEO |
Tax Withholding of RSU |
2,744 |
$105.23 |
$288.75K |
| 2026-03-17 |
Thurman Alex R. |
SVP & Chief Financial Officer |
Informative Sell |
625 |
$99.15 |
$61.97K |
| 2026-03-16 |
Thurman Alex R. |
SVP & Chief Financial Officer |
Tax Withholding of RSU |
614 |
$98.94 |
$60.75K |
| 2026-03-16 |
Navratil Tomas |
Chief Development Officer |
Informative Sell |
272 |
$99.05 |
$26.94K |
| 2026-03-16 |
Gilliam Joseph E |
President & COO |
Tax Withholding of RSU |
1,189 |
$98.94 |
$117.64K |
| 2026-03-16 |
Burns Thomas William |
Chairman & CEO |
Tax Withholding of RSU |
2,801 |
$98.94 |
$277.13K |
| 2026-03-13 |
Navratil Tomas |
Chief Development Officer |
Tax Withholding of RSU |
1,074 |
$97.02 |
$104.2K |
| 2026-03-13 |
Gilliam Joseph E |
President & COO |
Tax Withholding of RSU |
2,462 |
$97.02 |
$238.86K |
