Who owns Glaukos (GKOS)
Which tracked institutional funds hold GKOS, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See GKOS company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
151 tracked funds added or opened GKOS while 60 trimmed or exited it between 2026-Q1 and 2026-Q2 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
GKOS’s largest tracked holder by dollar value, BlackRock, Inc., sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp gap the other way — the median holder sizes GKOS more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in GKOS divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2026-Q1 and 2026-Q2, across 340 tracked filers holding GKOS, 205 increased or opened the position and 161 reduced or closed it; over the same quarter, open-market insider Form 4s were net sales.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in GKOS between the 2026-Q1 and 2026-Q2 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 24
- Jupiter Topco LLC$680M
- FULLER & THALER ASSET MANAGEMENT, INC.$74M
- BALYASNY ASSET MANAGEMENT L.P.$69M
- SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC$62M
- VAUGHAN NELSON INVESTMENT MANAGEMENT, L.P.$58M
- Anomaly Capital Management, LP$39M
Full exits 36
- JANUS HENDERSON GROUP PLC$576M
- Capital International Investors$40M
- PFM Health Sciences, LP$23M
- C WorldWide Group Holding A/S$22M
- ExodusPoint Capital Management, LP$19M
- LORD, ABBETT & CO. LLC$13M
Largest adds
- BlackRock, Inc.$471M
- VANGUARD PORTFOLIO MANAGEMENT LLC$119M
- MILLENNIUM MANAGEMENT LLC$95M
- STATE STREET CORP$89M
- VANGUARD CAPITAL MANAGEMENT LLC$86M
- Holocene Advisors, LP$63M
Largest trims
- WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC$23M
- ALLIANCEBERNSTEIN L.P.$23M
- GOLDMAN SACHS GROUP INC$23M
- Artisan Partners Limited Partnership$22M
- D. E. Shaw & Co., Inc.$19M
- Squarepoint Ops LLC$10M
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| BlackRock, Inc. added | 9,540,056 | $1.3B | 16.6% | 2026-Q2 |
| Jupiter Topco LLC new | 4,862,894 | $680M | 8.5% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC added | 3,321,839 | $464M | 5.8% | 2026-Q2 |
| PRIMECAP MANAGEMENT CO/CA/ trimmed | 3,040,705 | $425M | 5.3% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 2,551,132 | $357M | 4.4% | 2026-Q2 |
| STATE STREET CORP added | 2,315,568 | $324M | 4.0% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC added | 1,581,016 | $221M | 2.7% | 2026-Q2 |
| Holocene Advisors, LP added | 1,514,931 | $212M | 2.6% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 1,463,448 | $205M | 2.5% | 2026-Q2 |
| CITADEL ADVISORS LLC trimmed | 1,390,017 | $194M | 2.4% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC trimmed | 1,315,057 | $184M | 2.3% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. trimmed | 1,254,703 | $135M | 1.7% | 2026-Q2 |
| Capital World Investors added | 1,015,943 | $142M | 1.8% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC trimmed | 897,021 | $125M | 1.6% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 752,642 | $105M | 1.3% | 2026-Q2 |
| Invesco Ltd. trimmed | 706,877 | $99M | 1.2% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 679,632 | $95M | 1.2% | 2026-Q2 |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC trimmed | 661,675 | $92M | 1.2% | 2026-Q2 |
| Driehaus Capital Management LLC added | 650,571 | $91M | 1.1% | 2026-Q2 |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. added | 647,428 | $90M | 1.1% | 2026-Q2 |
| NORTHERN TRUST CORP added | 612,496 | $86M | 1.1% | 2026-Q2 |
| BRAIDWELL LP trimmed | 591,927 | $83M | 1.0% | 2026-Q2 |
| MORGAN STANLEY trimmed | 589,793 | $82M | 1.0% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ trimmed | 587,327 | $82M | 1.0% | 2026-Q2 |
| UBS Group AG added | 578,271 | $81M | 1.0% | 2026-Q2 |
| FULLER & THALER ASSET MANAGEMENT, INC. added | 529,922 | $74M | 0.9% | 2026-Q2 |
| NORGES BANK trimmed | 498,502 | $70M | 0.9% | 2026-Q2 |
| BALYASNY ASSET MANAGEMENT L.P. added | 491,636 | $69M | 0.9% | 2026-Q2 |
| JENNISON ASSOCIATES LLC added | 491,498 | $69M | 0.9% | 2026-Q2 |
| WESTFIELD CAPITAL MANAGEMENT CO LP added | 483,411 | $68M | 0.8% | 2026-Q2 |
| LOOMIS SAYLES & CO L P added | 469,388 | $66M | 0.8% | 2026-Q2 |
| SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC added | 446,550 | $62M | 0.8% | 2026-Q2 |
| Clearbridge Investments, LLC added | 431,066 | $60M | 0.7% | 2026-Q2 |
| WELLINGTON MANAGEMENT GROUP LLP added | 428,215 | $60M | 0.7% | 2026-Q2 |
| Allspring Global Investments Holdings, LLC added | 417,999 | $58M | 0.7% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 417,418 | $58M | 0.7% | 2026-Q2 |
| VAUGHAN NELSON INVESTMENT MANAGEMENT, L.P. new | 416,231 | $58M | 0.7% | 2026-Q2 |
| FMR LLC added | 377,485 | $53M | 0.7% | 2026-Q2 |
| PRINCIPAL FINANCIAL GROUP INC added | 358,758 | $50M | 0.6% | 2026-Q2 |
| Bank of New York Mellon Corp added | 357,148 | $50M | 0.6% | 2026-Q2 |
| Nuveen, LLC trimmed | 322,624 | $45M | 0.6% | 2026-Q2 |
| MARSHALL WACE, LLP added | 314,804 | $44M | 0.5% | 2026-Q2 |
| Artisan Partners Limited Partnership trimmed | 309,266 | $43M | 0.5% | 2026-Q2 |
| NEUBERGER BERMAN GROUP LLC added | 300,752 | $42M | 0.5% | 2026-Q2 |
| RIVERBRIDGE PARTNERS LLC trimmed | 282,089 | $39M | 0.5% | 2026-Q2 |
| Anomaly Capital Management, LP new | 275,995 | $39M | 0.5% | 2026-Q2 |
| Champlain Investment Partners, LLC trimmed | 275,171 | $38M | 0.5% | 2026-Q2 |
| TORONTO DOMINION BANK added | 268,152 | $37M | 0.5% | 2026-Q2 |
| Longaeva Partners L.P. new | 236,192 | $33M | 0.4% | 2026-Q2 |
| Public Sector Pension Investment Board trimmed | 201,743 | $28M | 0.4% | 2026-Q2 |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. added | 195,738 | $27M | 0.3% | 2026-Q2 |
| JPMORGAN CHASE & CO trimmed | 172,186 | $25M | 0.3% | 2026-Q2 |
| SEGALL BRYANT & HAMILL, LLC added | 168,445 | $24M | 0.3% | 2026-Q2 |
| BROWN CAPITAL MANAGEMENT LLC trimmed | 167,920 | $23M | 0.3% | 2026-Q2 |
| Legal & General Group Plc added | 165,836 | $23M | 0.3% | 2026-Q2 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP new | 154,929 | $22M | 0.3% | 2026-Q2 |
| GILDER GAGNON HOWE & CO LLC trimmed | 152,448 | $21M | 0.3% | 2026-Q2 |
| EVENTIDE ASSET MANAGEMENT, LLC | 150,036 | $21M | 0.3% | 2026-Q2 |
| Integral Health Asset Management, LLC trimmed | 150,000 | $21M | 0.3% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC added | 147,192 | $21M | 0.3% | 2026-Q2 |
| TimesSquare Capital Management, LLC new | 145,202 | $20M | 0.3% | 2026-Q2 |
| KEYBANK NATIONAL ASSOCIATION/OH trimmed | 145,077 | $20M | 0.3% | 2026-Q2 |
| RHUMBLINE ADVISERS trimmed | 143,454 | $20M | 0.2% | 2026-Q2 |
| PRUDENTIAL FINANCIAL INC added | 139,527 | $20M | 0.2% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC trimmed | 138,990 | $19M | 0.2% | 2026-Q2 |
| Point72 Asset Management, L.P. added | 138,300 | $19M | 0.2% | 2026-Q2 |
| Bellevue Group AG trimmed | 128,667 | $18M | 0.2% | 2026-Q2 |
| FRED ALGER MANAGEMENT, LLC added | 125,911 | $18M | 0.2% | 2026-Q2 |
| ROYAL BANK OF CANADA trimmed | 125,692 | $18M | 0.2% | 2026-Q2 |
| SILVERCREST ASSET MANAGEMENT GROUP LLC trimmed | 121,880 | $17M | 0.2% | 2026-Q2 |
| SEI INVESTMENTS CO trimmed | 121,325 | $17M | 0.2% | 2026-Q2 |
| Rhenman & Partners Asset Management AB added | 119,000 | $17M | 0.2% | 2026-Q2 |
| Swiss National Bank trimmed | 110,800 | $15M | 0.2% | 2026-Q2 |
| Assenagon Asset Management S.A. added | 108,736 | $15M | 0.2% | 2026-Q2 |
| Susquehanna Portfolio Strategies, LLC added | 102,507 | $14M | 0.2% | 2026-Q2 |
| Universal- Beteiligungs- und Servicegesellschaft mbH added | 93,493 | $13M | 0.2% | 2026-Q2 |
| WCM INVESTMENT MANAGEMENT, LLC trimmed | 93,267 | $13M | 0.2% | 2026-Q2 |
| RAYMOND JAMES FINANCIAL INC trimmed | 93,114 | $13M | 0.2% | 2026-Q2 |
| CANADA PENSION PLAN INVESTMENT BOARD added | 87,500 | $12M | 0.2% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 87,301 | $12M | 0.2% | 2026-Q2 |
| Cinctive Capital Management LP added | 85,070 | $12M | 0.1% | 2026-Q2 |
| CITIGROUP INC added | 78,941 | $11M | 0.1% | 2026-Q2 |
| Granite Investment Partners, LLC trimmed | 78,154 | $11M | 0.1% | 2026-Q2 |
| ASSETMARK, INC trimmed | 73,622 | $10M | 0.1% | 2026-Q2 |
| California Public Employees Retirement System added | 70,669 | $10M | 0.1% | 2026-Q2 |
| Defilade Capital Management, L.P. trimmed | 66,519 | $9M | 0.1% | 2026-Q2 |
| AustralianSuper Pty Ltd trimmed | 65,319 | $9M | 0.1% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 65,221 | $9M | 0.1% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM trimmed | 64,570 | $9M | 0.1% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP | 63,430 | $9M | 0.1% | 2026-Q2 |
| VICTORY CAPITAL MANAGEMENT INC trimmed | 62,202 | $9M | 0.1% | 2026-Q2 |
| DEUTSCHE BANK AG\ added | 61,957 | $9M | 0.1% | 2026-Q2 |
| NEW YORK STATE COMMON RETIREMENT FUND trimmed | 60,319 | $8M | 0.1% | 2026-Q2 |
| D. E. Shaw & Co., Inc. trimmed | 57,184 | $8M | 0.1% | 2026-Q2 |
| Corient Private Wealth LP added | 57,048 | $8M | 0.1% | 2026-Q2 |
| BRAUN STACEY ASSOCIATES INC new | 55,010 | $8M | 0.1% | 2026-Q2 |
| FIRST TRUST ADVISORS LP added | 55,010 | $8M | 0.1% | 2026-Q2 |
| ENVESTNET ASSET MANAGEMENT INC added | 53,463 | $7M | 0.1% | 2026-Q2 |
| VANGUARD ASSET MANAGEMENT, Ltd added | 53,077 | $7M | 0.1% | 2026-Q2 |
| Baird Financial Group, Inc. trimmed | 52,785 | $7M | 0.1% | 2026-Q2 |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.