Glaukos Corporation (GKOS) Insider Trading
Over the last 3 months, GKOS insiders made 0 open-market buys and 10 sales, a net sale of -$19.9M (SEC Form 4). Over the last 6 months, 258 institutions increased and 238 reduced their position (13F).
Insider Activity
Sentiment
0/100
Buys (3m)
0
Sells (3m)
10
Net (3m)
-$19.9M
Insider trades by month Buys Sells
Mar
Apr
May
Jun
Jul
Aug
Context3-month price +74.3%Institutions accumulating (13F)
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| Aug 20, 2026 | Kliman Gilbert Hdirector | Option | 2,500 | $25.77 |
| Aug 20, 2026 | Kliman Gilbert Hdirector | Sell | 2,500 | $190.00 |
| Aug 13, 2026 | Gilliam Joseph Eofficer: PRESIDENT & COO | Option | 20,000 | $55.18 |
| Aug 13, 2026 | Gilliam Joseph Eofficer: PRESIDENT & COO | Sell | 27,963 | $178.89 |
| Aug 13, 2026 | Gilliam Joseph Eofficer: PRESIDENT & COO | Option | 10,000 | $48.46 |
| Aug 13, 2026 | Gilliam Joseph Eofficer: PRESIDENT & COO | Sell | 32,037 | $180.49 |
| Aug 11, 2026 | Thurman Alex R.officer: SVP & CHIEF FINANCIAL OFFICER | Sell | 20,000 | $180.13 |
| Aug 11, 2026 | Thurman Alex R.officer: SVP & CHIEF FINANCIAL OFFICER | Option | 20,000 | $33.81 |
| Aug 3, 2026 | WEN LEANAdirector | Sell | 525 | $167.63 |
| Jul 21, 2026 | Thurman Alex R.officer: SVP & CHIEF FINANCIAL OFFICER | Option | 10,000 | $38.68 |
| Jul 21, 2026 | Thurman Alex R.officer: SVP & CHIEF FINANCIAL OFFICER | Sell | 10,000 | $160.00 |
| Jul 13, 2026 | Thurman Alex R.officer: SVP & CHIEF FINANCIAL OFFICER | Sell | 10,000 | $155.00 |
| Jul 13, 2026 | Thurman Alex R.officer: SVP & CHIEF FINANCIAL OFFICER | Option | 10,000 | $38.68 |
| Jul 8, 2026 | Thurman Alex R.officer: SVP & CHIEF FINANCIAL OFFICER | Sell | 10,000 | $150.00 |
| Jul 8, 2026 | Thurman Alex R.officer: SVP & CHIEF FINANCIAL OFFICER | Option | 10,000 | $38.68 |
| Jul 8, 2026 | Navratil Tomasofficer: CHIEF DEVELOPMENT OFFICER | Sell | 716 | $139.06 |
| Jun 29, 2026 | Gilliam Joseph Eofficer: PRESIDENT & COO | Tax | 1,056 | $142.57 |
| Jun 29, 2026 | Burns Thomas Williamdirector, officer: CHAIRMAN & CEO | Tax | 4,059 | $142.57 |
| Jun 29, 2026 | Navratil Tomasofficer: CHIEF DEVELOPMENT OFFICER | Tax | 483 | $142.57 |
| Jun 23, 2026 | Kliman Gilbert Hdirector | Grant | 2,987 | $106.52 |
| Jun 23, 2026 | Foley Mark Jdirector | Grant | 2,987 | $106.52 |
| Jun 23, 2026 | Hoffmeister David Fdirector | Grant | 2,987 | $106.52 |
| Jun 23, 2026 | WEN LEANAdirector | Grant | 2,987 | $106.52 |
| Jun 23, 2026 | Stapley Marcdirector | Grant | 2,987 | $106.52 |
| Jun 23, 2026 | WEISNER AIMEE Sdirector | Grant | 2,987 | $106.52 |
| Jun 23, 2026 | Torres Denicedirector | Grant | 2,987 | $106.52 |
| Jun 18, 2026 | Navratil Tomasofficer: CHIEF DEVELOPMENT OFFICER | Sell | 1,537 | $130.68 |
| Jun 1, 2026 | Hoffmeister David Fdirector | Grant | 2,987 | $53.57 |
| Jun 1, 2026 | Foley Mark Jdirector | Grant | 2,987 | $53.57 |
| Jun 1, 2026 | WEN LEANAdirector | Grant | 1,878 | — |
Source: GKOS SEC Form 4 filings, latest Aug 20, 2026. For informational purposes only — not investment advice.
Institutional activity (13F)
How institutions changed their GKOS positions over the last 6 months (SEC Form 13F).
Increased
258
New positions
122
Reduced
238
Sold out
42
Largest moves
| Institution | Action | Shares | Filed |
|---|---|---|---|
| BlackRock, Inc. | Increased | 9.5M | Aug 7, 2026 |
| BLACKROCK, INC. | Reduced | 9.1M | May 13, 2026 |
| JANUS HENDERSON GROUP PLC | Increased | 5.3M | May 18, 2026 |
| Jupiter Topco LLC | New Position | 4.9M | Aug 14, 2026 |
| PRIMECAP MANAGEMENT CO/CA/ | Reduced | 3.4M | May 11, 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | Increased | 3.3M | Aug 13, 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | New Position | 3.2M | May 8, 2026 |
| PRIMECAP MANAGEMENT CO/CA/ | Reduced | 3.0M | Aug 14, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | Increased | 2.6M | Aug 13, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | New Position | 2.5M | May 15, 2026 |
| STATE STREET CORP | Increased | 2.3M | Aug 7, 2026 |
| STATE STREET CORP | Increased | 2.2M | May 15, 2026 |
| MILLENNIUM MANAGEMENT LLC | Increased | 1.6M | Aug 14, 2026 |
| AMERIPRISE FINANCIAL INC | Reduced | 1.6M | Jul 17, 2026 |
| Holocene Advisors, LP | Increased | 1.5M | Aug 14, 2026 |
Source: SEC Form 13F filings. For informational purposes only — not investment advice.