Glaukos
GKOS · NYSE
$173.43+$6.47 (+3.88%)TodayMarket closed ·
Prev close $166.96
Who owns GKOS
Largest institutional holders, from their latest 13F filings
The 10 largest institutions hold 52.2% of GKOS’s shares.
- BlackRock Institutional Trust Company, N.A.14.3%
- Janus Henderson Investors8.2%
- Vanguard Portfolio Management, LLC5.6%
- PRIMECAP Management Company5.2%
- Next 6 largest institutions18.9%
- All other shareholders47.8%
| Holder | Shares | % of shares |
|---|---|---|
| BlackRock Institutional Trust Company, N.A. | 8.45M | 14.32% |
| Janus Henderson Investors | 4.86M | 8.24% |
| Vanguard Portfolio Management, LLC | 3.32M | 5.63% |
| PRIMECAP Management Company | 3.04M | 5.16% |
| Vanguard Capital Management, LLC | 2.55M | 4.33% |
| State Street Investment Management (US) | 2.32M | 3.93% |
| Burns (Thomas William) | 1.70M | 2.87% |
| Millennium Management LLC | 1.58M | 2.68% |
| Holocene Advisors, LP | 1.51M | 2.57% |
| Geode Capital Management, L.L.C. | 1.46M | 2.48% |
Largest mutual fund holders
| Holder | Shares | % of shares |
|---|---|---|
| iShares Core S&P Small-Cap ETF | 3.58M | 6.07% |
| Vanguard Total Stock Market Index Fund | 1.78M | 3.02% |
| iShares Russell 2000 ETF | 1.49M | 2.52% |
| Vanguard Capital Opportunity Fund | 1.48M | 2.51% |
| Vanguard Small-Cap Index Fund | 1.28M | 2.18% |
Insider trades
Form 4 filings by officers, directors and large holders
Over the last 6 months, insiders sold $28.96M (32 trades) of GKOS on the open market, with no buys.
| Insider | Type | Shares | Value |
|---|---|---|---|
| Navratil Tomas | Sale | 312 | $51.67K |
| Navratil Tomas | Sale | 327 | $53.88K |
| Navratil Tomas | Sale | 888 | $145.57K |
| Navratil Tomas | Sale | 1.08K | $167.74K |
| Navratil Tomas | Sale | 229 | $35.32K |
| Navratil Tomas | Sale | 136 | $20.77K |
| Navratil Tomas | Sale | 167 | $25.33K |
| Navratil Tomas | Sale | 4 | $688 |
| Navratil Tomas | Sale | 234 | $40.00K |
| Navratil Tomas | Sale | 120 | $20.21K |
Short interest
Settled Sep 30, 2026
- Shares short
- 3.85M
- Days to cover
- 4.08
- % of shares outstanding
- 6.53%
- Average daily volume
- 944.39K
- Change since last report
- −7.6%
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