GLAUKOS CORP GKOS
COM · Common Stock · CUSIP 377322102 · ISIN US3773221029
- SectorHealth care
- IndustrySurgical & Medical Instruments & Apparatus
- HeadquartersAliso Viejo, CA
- FilingsSEC EDGAR
* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once ($2.8m this quarter). Holder counts are more reliable. Shares outstanding: 57.3m as of 2025-07-31, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $103.28. Options: 12 managers hold calls ($27.8m notional), 8 hold puts ($47.0m).
Trends to Q2 2025
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q3 2022 | 222 |
| Q4 2022 | 214 |
| Q1 2023 | 203 |
| Q2 2023 | 220 |
| Q3 2023 | 233 |
| Q4 2023 | 246 |
| Q1 2024 | 254 |
| Q2 2024 | 282 |
| Q3 2024 | 315 |
| Q4 2024 | 322 |
| Q1 2025 | 318 |
| Q2 2025 | 299 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q3 2023 | 112 | 97 |
| Q4 2023 | 124 | 110 |
| Q1 2024 | 110 | 140 |
| Q2 2024 | 162 | 108 |
| Q3 2024 | 177 | 109 |
| Q4 2024 | 157 | 146 |
| Q1 2025 | 167 | 169 |
| Q2 2025 | 188 | 148 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q3 2024 | $19.5m | $27.8m | 1.43 |
| Q4 2024 | $46.1m | $64.7m | 1.40 |
| Q1 2025 | $27.9m | $77.9m | 2.79 |
| Q2 2025 | $27.8m | $47.0m | 1.69 |
Biggest buyers
| WELLINGTON MANAGEMENT GROUP LLP | Added | +953.6k |
| Point72 Asset Management, L.P. | New | +719.3k |
| PRIMECAP MANAGEMENT CO/CA/ | Added | +609.5k |
| AustralianSuper Pty Ltd | New | +406.1k |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC | Added | +390.8k |
| Champlain Investment Partners, LLC | New | +363.0k |
| Capital World Investors | Added | +300.6k |
| Holocene Advisors, LP | Added | +299.1k |
| Squarepoint Ops LLC | Added | +277.9k |
| Iron Triangle Partners LP | New | +271.2k |
Biggest sellers
| Driehaus Capital Management LLC | Reduced | -473.2k |
| Invesco Ltd. | Reduced | -455.0k |
| SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC | Reduced | -366.2k |
| LORD, ABBETT & CO. LLC | Sold out | -310.4k |
| VOYA INVESTMENT MANAGEMENT LLC | Reduced | -202.5k |
| FMR LLC | Reduced | -201.0k |
| RA CAPITAL MANAGEMENT, L.P. | Sold out | -190.3k |
| RTW INVESTMENTS, LP | Sold out | -190.0k |
| FRED ALGER MANAGEMENT, LLC | Reduced | -179.7k |
| Nuveen, LLC | Reduced | -168.4k |
Biggest calls
| SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC | New | $7.7m75.0k shares |
| MILLENNIUM MANAGEMENT LLC | Reduced | $7.0m67.5k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $6.4m62.4k shares |
| CITADEL ADVISORS LLC | Reduced | $3.0m29.1k shares |
| JANE STREET GROUP, LLC | Reduced | $1.1m10.7k shares |
| SIMPLEX TRADING, LLC | Added | $1.0m9.9k shares |
| UBS Group AG | New | $785.0k7.6k shares |
| WOLVERINE TRADING, LLC | Reduced | $344.8k3.4k shares |
| Squarepoint Ops LLC | Unchanged | $299.5k2.9k shares |
| GROUP ONE TRADING LLC | Reduced | $103.3k1.0k shares |
Biggest puts
| JANE STREET GROUP, LLC | Reduced | $36.5m353.1k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $4.1m39.3k shares |
| CITADEL ADVISORS LLC | Reduced | $3.3m31.8k shares |
| WOLVERINE TRADING, LLC | Reduced | $2.6m26.0k shares |
| Squarepoint Ops LLC | Unchanged | $278.9k2.7k shares |
| SIMPLEX TRADING, LLC | Reduced | $165.0k1.6k shares |
| GROUP ONE TRADING LLC | Added | $113.6k1.1k shares |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | Unchanged | $00 shares |
Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.
Major shareholders (over 5%)
Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.
| Holder | Stake |
|---|---|
| BlackRock, Inc. 13G · institution filed 2025-04-29 | 14.4% |
| JANUS HENDERSON GROUP PLC 13G · institution +3.9 pts · filed 2026-05-15 | 9.2% |
| PRIMECAP MANAGEMENT CO/CA/ 13G · institution new · filed 2026-02-11 | 5.9% |
| VANGUARD PORTFOLIO MANAGEMENT LLC 13G · institution new · filed 2026-04-29 | 5.6% |
| VANGUARD CAPITAL MANAGEMENT LLC 13G · institution new · filed 2026-04-29 | 5.1% |
Fell to 5% or below in the last year: VANGUARD GROUP INC (0.0%, 2026-03-26; now reported by VANGUARD PORTFOLIO MANAGEMENT LLC), WELLINGTON MANAGEMENT GROUP LLP (0.8%, 2026-02-10)
Insider purchases and sales in Q2 2025
Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.
Officers and directors buying vs selling
Number of people, by quarter (10% owners not included)
Numbers
| Quarter | Buying | Bought | Selling | Sold | Sold under a plan |
|---|---|---|---|---|---|
| Q3 2023 | 0 | — | 3 | $9.7m | — |
| Q4 2023 | 0 | — | 4 | $20.7m | $20.6m |
| Q1 2024 | 0 | — | 6 | $30.3m | $28.0m |
| Q2 2024 | 0 | — | 4 | $8.7m | $8.1m |
| Q3 2024 | 0 | — | 4 | $5.1m | $1.7m |
| Q4 2024 | 0 | — | 2 | $2.6m | $2.3m |
| Q1 2025 | 0 | — | 3 | $3.2m | $665.0k |
| Q2 2025 | 0 | — | 0 | — | — |
None reported in Q2 2025.
Holders, Q2 2025
| Manager | Shares | Change |
|---|---|---|
| BlackRock, Inc. 0.02% of their portfolio | 8.7m $901.2m | Added +168.1k |
| FMR LLC 0.04% of their portfolio | 6.3m $654.5m | Reduced -201.0k |
| VANGUARD GROUP INC 0.01% of their portfolio | 6.1m $631.3m | Added +147.1k |
| WELLINGTON MANAGEMENT GROUP LLP 0.06% of their portfolio | 3.2m $335.1m | Added +953.6k |
| STATE STREET CORP 0.01% of their portfolio | 2.1m $215.9m | Added +106.0k |
| AMERIPRISE FINANCIAL INC 0.05% of their portfolio | 2.0m $206.5m | Added +55.3k |
| PRIMECAP MANAGEMENT CO/CA/ 0.15% of their portfolio | 1.8m $188.8m | Added +609.5k |
| GEODE CAPITAL MANAGEMENT, LLC 0.01% of their portfolio | 1.3m $137.5m | Added +115.5k |
| ALLIANCEBERNSTEIN L.P. 0.04% of their portfolio | 1.3m $129.3m | Reduced -25.7k |
| WESTFIELD CAPITAL MANAGEMENT CO LP 0.51% of their portfolio | 1.2m $120.6m | Added +83.7k |
| BROWN CAPITAL MANAGEMENT LLC 3.42% of their portfolio | 1.1m $117.7m | Reduced -53.5k |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC 0.31% of their portfolio | 1.1m $117.3m | Added +390.8k |
| JANUS HENDERSON GROUP PLC 0.06% of their portfolio | 1.1m $112.3m | Added +186.8k |
| Holocene Advisors, LP 0.27% of their portfolio | 1.0m $108.0m | Added +299.1k |
| Invesco Ltd. 0.02% of their portfolio | 997.1k $103.0m | Reduced -455.0k |
| Capital World Investors 0.01% of their portfolio | 850.9k $87.9m | Added +300.6k |
| NORGES BANK 0.01% of their portfolio | 738.8k $76.3m | Added +83.9k |
| Point72 Asset Management, L.P. 0.18% of their portfolio | 719.3k $74.3m | New |
| GILDER GAGNON HOWE & CO LLC 0.77% of their portfolio | 700.6k $72.4m | Reduced -135.9k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.01% of their portfolio | 700.5k $72.4m | Added +58.5k |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 642.4k $66.4m | Added +59.4k |
| NORTHERN TRUST CORP 0.01% of their portfolio | 635.0k $65.6m | Added +65.3k |
| BRAIDWELL LP 2.13% of their portfolio | 603.4k $62.3m | Reduced -21.0k |
| LOOMIS SAYLES & CO L P 0.08% of their portfolio | 593.6k $61.3m | Reduced -46.5k |
| GOLDMAN SACHS GROUP INC 0.01% of their portfolio | 560.9k $57.9m | Added +191.8k |
| Driehaus Capital Management LLC 0.41% of their portfolio | 500.5k $51.7m | Reduced -473.2k |
| MORGAN STANLEY 0.00% of their portfolio | 496.3k $51.3m | Reduced -41.1k |
| Clearbridge Investments, LLC 0.04% of their portfolio | 478.8k $49.5m | Added +129.2k |
| FRED ALGER MANAGEMENT, LLC 0.20% of their portfolio | 426.0k $44.0m | Reduced -179.7k |
| AustralianSuper Pty Ltd 0.21% of their portfolio | 406.1k $41.9m | New |
| RIVERBRIDGE PARTNERS LLC 0.67% of their portfolio | 404.0k $41.7m | Added +118.5k |
| ROYAL BANK OF CANADA 0.00% of their portfolio | 392.8k $40.6m | Added +164.5k |
| Bank of New York Mellon Corp 0.01% of their portfolio | 392.5k $40.5m | Added +24.3k |
| NEW YORK STATE COMMON RETIREMENT FUND 0.05% of their portfolio | 387.9k $40.1m | Added +10.2k |
| Champlain Investment Partners, LLC 0.26% of their portfolio | 363.0k $37.5m | New |
| DIMENSIONAL FUND ADVISORS LP 0.01% of their portfolio | 333.8k $34.5m | Reduced -95.5k |
| CITADEL ADVISORS LLC 0.03% of their portfolio | 320.5k $33.1m | Reduced -100.0k |
| Atika Capital Management LLC 3.45% of their portfolio | 319.5k $33.0m | Added +56.0k |
| Squarepoint Ops LLC 0.07% of their portfolio | 297.1k $30.7m | Added +277.9k |
| Artisan Partners Limited Partnership 0.04% of their portfolio | 287.2k $29.7m | Reduced -15.2k |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 285.6k $29.5m | Added +73.4k |
| PRINCIPAL FINANCIAL GROUP INC 0.02% of their portfolio | 283.4k $29.3m | Reduced -43.6k |
| Allspring Global Investments Holdings, LLC 0.05% of their portfolio | 280.8k $28.8m | Reduced -39.9k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.01% of their portfolio | 279.4k $28.9m | Added +49.4k |
| Iron Triangle Partners LP 4.43% of their portfolio | 271.2k $28.0m | New |
| Capital International Investors 0.00% of their portfolio | 246.5k $25.5m | New |
| Amundi 0.01% of their portfolio | 239.3k $24.8m | Added +12.0k |
| Rhenman & Partners Asset Management AB 3.07% of their portfolio | 235.0k $24.3m | Reduced -35.0k |
| MARSHALL WACE, LLP 0.03% of their portfolio | 230.7k $23.8m | Reduced -114.1k |
| COMERICA BANK 0.09% of their portfolio | 225.2k $23.3m | Added +25.9k |
| EVENTIDE ASSET MANAGEMENT, LLC 0.40% of their portfolio | 220.7k $22.8m | Reduced -70.2k |
| Freestone Grove Partners LP 0.17% of their portfolio | 219.8k $22.7m | New |
| Qube Research & Technologies Ltd 0.03% of their portfolio | 196.4k $20.3m | Reduced -18.5k |
| Legal & General Group Plc 0.01% of their portfolio | 195.2k $20.2m | Added +11.2k |
| Public Sector Pension Investment Board 0.09% of their portfolio | 194.8k $20.1m | Added +20.0k |
| Granite Investment Partners, LLC 0.97% of their portfolio | 192.6k $19.9m | Added +177.6k |
| Polar Asset Management Partners Inc. 0.46% of their portfolio | 177.1k $18.3m | Added +159.1k |
| C WorldWide Group Holding A/S 0.23% of their portfolio | 162.2k $16.8m | Unchanged |
| RHUMBLINE ADVISERS 0.01% of their portfolio | 159.3k $16.5m | Added +17.9k |
| UBS Group AG 0.00% of their portfolio | 152.8k $15.8m | Added +74.5k |
| Nuveen, LLC 0.00% of their portfolio | 151.3k $15.6m | Reduced -168.4k |
| Man Group plc 0.03% of their portfolio | 147.1k $15.2m | Added +137.2k |
| KEYBANK NATIONAL ASSOCIATION/OH 0.05% of their portfolio | 142.7k $14.7m | Added +34 |
| Susquehanna Portfolio Strategies, LLC 0.30% of their portfolio | 132.7k $13.7m | New |
| VICTORY CAPITAL MANAGEMENT INC 0.01% of their portfolio | 122.5k $12.7m | Reduced -17.9k |
| SEGALL BRYANT & HAMILL, LLC 0.18% of their portfolio | 122.4k $12.6m | Added +20.7k |
| SEI INVESTMENTS CO 0.01% of their portfolio | 120.8k $12.5m | Added +19.7k |
| RAYMOND JAMES FINANCIAL INC 0.00% of their portfolio | 114.6k $11.8m | Reduced -14.4k |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.02% of their portfolio | 112.0k $11.6m | Added +44.5k |
| BARCLAYS PLC 0.00% of their portfolio | 109.4k $11.3m | Added +43.0k |
| VOYA INVESTMENT MANAGEMENT LLC 0.01% of their portfolio | 108.2k $11.2m | Reduced -202.5k |
| Swiss National Bank 0.01% of their portfolio | 108.0k $11.2m | Added +1.1k |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.00% of their portfolio | 107.5k $11.1m | Added +69.8k |
| WCM INVESTMENT MANAGEMENT, LLC 0.02% of their portfolio | 102.9k $10.4m | Added +6.0k |
| Divisadero Street Capital Management, LP 0.70% of their portfolio | 101.8k $10.5m | New |
| OSTERWEIS CAPITAL MANAGEMENT INC 0.47% of their portfolio | 94.4k $9.7m | Added +35.2k |
| JANE STREET GROUP, LLC 0.01% of their portfolio | 86.2k $8.9m | Reduced -87.3k |
| SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC 0.30% of their portfolio | 75.0k $7.7m | Reduced -366.2k |
| MACQUARIE GROUP LTD 0.01% of their portfolio | 73.8k $7.6m | Added +40.3k |
| California Public Employees Retirement System 0.00% of their portfolio | 68.3k $7.1m | Reduced -647 |
| Allianz Asset Management GmbH 0.01% of their portfolio | 64.0k $6.6m | Added +7.1k |
| Baird Financial Group, Inc. 0.01% of their portfolio | 63.4k $6.5m | Added +9.5k |
| CANADA LIFE ASSURANCE Co 0.01% of their portfolio | 60.8k $6.3m | Added +1.0k |
| PRUDENTIAL FINANCIAL INC 0.01% of their portfolio | 59.4k $6.1m | Added +5.6k |
| Universal- Beteiligungs- und Servicegesellschaft mbH 0.01% of their portfolio | 59.3k $6.1m | Reduced -30.1k |
| DNB Asset Management AS 0.02% of their portfolio | 57.3k $5.9m | New |
| CITIGROUP INC 0.00% of their portfolio | 56.6k $5.8m | Reduced -20.9k |
| Bellevue Group AG 0.13% of their portfolio | 55.9k $5.8m | Unchanged |
| EFG Asset Management (North America) Corp. 0.81% of their portfolio | 55.5k $5.7m | Added +2.4k |
| SILVERCREST ASSET MANAGEMENT GROUP LLC 0.04% of their portfolio | 52.6k $5.4m | New |
| Ensign Peak Advisors, Inc 0.01% of their portfolio | 51.4k $5.3m | Added +8.6k |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.01% of their portfolio | 50.9k $5.3m | Added +421 |
| THORNBURG INVESTMENT MANAGEMENT INC 0.07% of their portfolio | 50.4k $5.2m | Unchanged |
| Integral Health Asset Management, LLC 0.48% of their portfolio | 50.0k $5.2m | New |
| INTECH INVESTMENT MANAGEMENT LLC 0.05% of their portfolio | 49.3k $5.1m | Reduced -43.2k |
| ENVESTNET ASSET MANAGEMENT INC 0.00% of their portfolio | 48.4k $5.0m | Added +20.4k |
| NEW YORK STATE TEACHERS RETIREMENT SYSTEM 0.01% of their portfolio | 48.2k $5.0m | Unchanged |
| BLAIR WILLIAM & CO/IL 0.01% of their portfolio | 47.2k $4.9m | Added +518 |
| SIT INVESTMENT ASSOCIATES INC 0.10% of their portfolio | 45.3k $4.7m | Added +27.6k |
| Thrivent Financial for Lutherans 0.01% of their portfolio | 42.0k $4.3m | Added +1.5k |