Glaukos Corporation (GKOS) Ownership
GKOS ownership summary
as of October 17, 2026- Institutions
- 105.4% of shares outstanding
- Insiders
- 3.57% of shares outstanding
- Shares outstanding
- 59.0M
- Float
- 56.8M shares available to trade
- Short interest
- 7.91% 3.9M shares short
- Days to cover
- 4.67 short interest up 0.8% vs prior month
- Institutions 105.41%
- Insiders 3.57%
GKOS top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | BlackRock Inc | 16.17% | 9.5M | $1.57B | +450,027 (+5.0%) | June 30, 2026 |
| 2 | HHG PLC | 9.07% | 5.3M | $881.6M | +2.3M (+77.2%) | March 31, 2026 |
| 3 | Jupiter Topco LLC | 8.24% | 4.9M | $801.6M | +4.9M (0.0%) | June 30, 2026 |
| 4 | Vanguard Portfolio Management, LLC | 5.63% | 3.3M | $547.6M | +113,476 (+3.5%) | June 30, 2026 |
| 5 | PRIMECAP Management Company | 5.16% | 3.0M | $501.2M | −329,923 (−9.8%) | June 30, 2026 |
| 6 | Vanguard Capital Management, LLC | 4.33% | 2.6M | $420.5M | +42,361 (+1.7%) | June 30, 2026 |
| 7 | State Street Corp | 3.93% | 2.3M | $381.7M | +132,951 (+6.1%) | June 30, 2026 |
| 8 | Millennium Management LLC | 2.68% | 1.6M | $260.6M | +407,320 (+34.7%) | June 30, 2026 |
| 9 | Holocene Advisors, LP | 2.57% | 1.5M | $249.7M | +131,216 (+9.5%) | June 30, 2026 |
| 10 | Geode Capital Management, LLC | 2.48% | 1.5M | $241.2M | +106,995 (+7.9%) | June 30, 2026 |
| 11 | Citadel Advisors Llc | 2.36% | 1.4M | $229.1M | −56,909 (−3.9%) | June 30, 2026 |
| 12 | Ameriprise Financial Inc | 2.23% | 1.3M | $216.8M | −295,717 (−18.4%) | June 30, 2026 |
| 13 | AllianceBernstein L.P. | 2.13% | 1.3M | $206.8M | −142,853 (−10.2%) | June 30, 2026 |
| 14 | Capital World Investors | 1.72% | 1.0M | $167.5M | +26,883 (+2.7%) | June 30, 2026 |
| 15 | The Goldman Sachs Group Inc | 1.52% | 897K | $147.9M | −477,937 (−34.8%) | June 30, 2026 |
| 16 | Charles Schwab Investment Management Inc | 1.28% | 753K | $124.1M | +38,253 (+5.4%) | June 30, 2026 |
| 17 | Amvescap Plc. | 1.20% | 707K | $116.5M | −207,311 (−22.7%) | June 30, 2026 |
| 18 | T. Rowe Price Associates, Inc. | 1.15% | 680K | $112.0M | +343,207 (+102.0%) | June 30, 2026 |
| 19 | William Blair Investment Management, LLC | 1.12% | 662K | $109.1M | −412,144 (−38.4%) | June 30, 2026 |
| 20 | Driehaus Capital Management LLC | 1.10% | 651K | $107.2M | +162,659 (+33.3%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 13 holders added 9.1M shares and 7 cut 1.9M.
GKOS top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | iShares Core S&P Small-Cap ETF | 5.96% | 3.5M | $579.2M | +732 (+0.0%) | September 30, 2026 |
| 2 | Vanguard MStar Total Stk Mkt Idx Invest | 3.01% | 1.8M | $292.3M | −6,240 (−0.4%) | August 31, 2026 |
| 3 | iShares Russell 2000 ETF | 2.54% | 1.5M | $246.6M | −13,261 (−0.9%) | September 30, 2026 |
| 4 | Vanguard Capital Opportunity Inv | 2.51% | 1.5M | $243.6M | −220,752 (−13.0%) | June 30, 2026 |
| 5 | Vanguard Small Cap Index | 2.18% | 1.3M | $211.6M | +699 (+0.1%) | August 31, 2026 |
| 6 | PRIMECAP Odyssey Aggressive Growth | 1.72% | 1.0M | $167.0M | −90,728 (−8.2%) | June 30, 2026 |
| 7 | Janus Henderson Triton D | 1.69% | 996K | $164.1M | −62,237 (−5.9%) | August 31, 2026 |
| 8 | American Funds SMALLCAP World A | 1.68% | 989K | $163.0M | −373,343 (−27.4%) | June 30, 2026 |
| 9 | Vanguard MStar Small Cap Growth Indx Inv | 1.25% | 737K | $121.5M | −5,666 (−0.8%) | August 31, 2026 |
| 10 | Janus Henderson Enterprise D | 1.20% | 709K | $116.8M | — | August 31, 2026 |
| 11 | Janus Henderson Venture D | 1.09% | 642K | $105.8M | −30,203 (−4.5%) | August 31, 2026 |
| 12 | Janus Henderson Contrarian D | 1.08% | 639K | $105.4M | — | August 31, 2026 |
| 13 | Fidelity Small Cap Index | 1.07% | 630K | $103.9M | +5,106 (+0.8%) | July 31, 2026 |
| 14 | iShares Russell 2000 Growth ETF | 0.91% | 540K | $88.9M | −683 (−0.1%) | September 30, 2026 |
| 15 | State Street SPDR Port S&P 600 Sm CpETF | 0.91% | 537K | $88.5M | — | September 30, 2026 |
| 16 | Fidelity Growth Company Fund | 0.82% | 481K | $79.3M | +442,200 (+1,145.6%) | August 31, 2026 |
| 17 | Invesco Discovery A | 0.72% | 424K | $70.0M | +35,042 (+9.0%) | August 31, 2026 |
| 18 | Nomura Small Cap Core I | 0.71% | 416K | $68.6M | — | August 31, 2026 |
| 19 | iShares S&P Small-Cap 600 Growth ETF | 0.64% | 377K | $62.1M | — | September 30, 2026 |
| 20 | PRIMECAP Odyssey Growth | 0.63% | 374K | $61.6M | −5,000 (−1.3%) | June 30, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
GKOS insider transactions
latest 12| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2026-03-25 | Alex R Thurman | Sell | $106.46 | 2,511 | $267,321 |
| 2026-03-24 | Alex R Thurman | Sell | $105.24 | 1,521 | $160,070 |
| 2026-03-17 | Alex R Thurman | Sell | $99.15 | 625 | $61,969 |
| 2026-02-19 | Aimee S Weisner | Sell | $117.38 | 15,000 | $1.8M |
| 2026-01-22 | Joseph E Gilliam | Sell | $127.68 | 10,498 | $1.3M |
| 2026-01-22 | Marc Stapley | Sell | $127.71 | 15,000 | $1.9M |
| 2026-01-21 | Joseph E Gilliam | Sell | $124.65 | 4,502 | $561,174 |
| 2026-01-16 | Thomas William Burns | Sell | $115.00 | 186,945 | $21.5M |
| 2026-01-08 | Thomas William Burns | Sell | $115.00 | 88,055 | $10.1M |
| 2025-12-09 | Gilbert H Kliman | Sell | $107.27 | 5,000 | $536,350 |
| 2025-11-25 | Alex R Thurman | Sell | $105.00 | 315 | $33,075 |
| 2025-11-18 | Joseph E Gilliam | Sell | $90.00 | 19,340 | $1.7M |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
GKOS shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns GKOS
Institutional investors own 105.4% of Glaukos's shares and insiders 3.57%. The largest holder is BlackRock Inc with 16.17% of the shares (9.5M), as of June 30, 2026. Among the top 20 institutions, 13 added shares and 7 reduced their stake in the latest filings. Short interest is 7.91% of the float, or 4.67 days of average trading volume. The share count rose 131.1% since 2014.
Related: GKOS analyst forecast, GKOS key metrics. See the GKOS stock overview for the latest quote and news.
GKOS ownership FAQ
Who owns the most Glaukos stock?
The largest shareholders of Glaukos are BlackRock Inc (16.17%), HHG PLC (9.07%), Jupiter Topco LLC (8.24%), Vanguard Portfolio Management, LLC (5.63%), PRIMECAP Management Company (5.16%).
What percentage of Glaukos is owned by institutions?
Institutions hold 105.4% of Glaukos's shares outstanding; insiders hold 3.57%.
Which funds own Glaukos?
The largest fund holders of Glaukos are iShares Core S&P Small-Cap ETF (5.96%), Vanguard MStar Total Stk Mkt Idx Invest (3.01%), iShares Russell 2000 ETF (2.54%), Vanguard Capital Opportunity Inv (2.51%), Vanguard Small Cap Index (2.18%).
What is Glaukos's short interest?
3.9M shares of Glaukos were sold short, 7.91% of the float; at the average daily volume it would take 4.67 days to cover.
Are insiders buying or selling Glaukos?
Of the latest 12 reported insider transactions in Glaukos (since November 18, 2025), 0 were purchases and 12 were sales.
How many shares of Glaukos are outstanding?
Glaukos has 59.0M shares outstanding, of which 56.8M are in the public float.