Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in GKOS held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 9.1M | $978.6M | -0.8% | 15.531% | 0.02% |
| 2 | JANUS HENDERSON GROUP PLC | 5.3M | $575.8M | +77.2% | 9.138% | 0.29% |
| 3 | PRIMECAP MANAGEMENT CO/CA/ | 3.4M | $362.9M | -0.2% | 5.759% | 0.29% |
| 4 | VANGUARD PORTFOLIO MANAGEMENT LLC | 3.2M | $345.4M | β | 5.482% | 0.02% |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | 2.5M | $270.1M | β | 4.287% | 0.01% |
| 6 | STATE STREET CORP | 2.2M | $235.0M | +2.8% | 3.729% | 0.01% |
| 7 | AMERIPRISE FINANCIAL INC | 1.6M | $173.4M | -23.4% | 2.752% | 0.04% |
| 8 | CITADEL ADVISORS LLC | 1.5M | $158.3M | +1634.9% | 2.512% | 0.07% |
| 9 | ALLIANCEBERNSTEIN L.P. | 1.4M | $157.8M | -15.0% | 2.388% | 0.05% |
| 10 | Holocene Advisors, LP | 1.4M | $149.0M | +6.5% | 2.364% | 0.36% |
| 11 | GOLDMAN SACHS GROUP INC | 1.4M | $148.0M | +1.8% | 2.349% | 0.02% |
| 12 | GEODE CAPITAL MANAGEMENT, LLC | 1.4M | $146.1M | +2.9% | 2.318% | 0.01% |
| 13 | WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC | 1.1M | $115.6M | -3.0% | 1.835% | 0.38% |
| 14 | Capital World Investors | 989K | $106.5M | +16.2% | 1.690% | 0.01% |
| 15 | Invesco Ltd. | 914K | $98.4M | +17.2% | 1.562% | 0.02% |
| 16 | BRAIDWELL LP | 764K | $82.2M | -17.2% | 1.304% | 2.74% |
| 17 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 714K | $76.9M | +0.1% | 1.221% | 0.01% |
| 18 | MORGAN STANLEY | 679K | $73.1M | +1.2% | 1.160% | 0.00% |
| 19 | BANK OF AMERICA CORP /DE/ | 657K | $70.8M | +22.1% | 1.123% | 0.01% |
| 20 | NOMURA ASSET MANAGEMENT INTERNATIONAL INC. | 612K | $65.9M | -9.0% | 1.046% | 0.11% |
| 21 | Artisan Partners Limited Partnership | 607K | $65.4M | -13.6% | 1.038% | 0.11% |
| 22 | NORTHERN TRUST CORP | 576K | $62.0M | -1.9% | 0.984% | 0.01% |
| 23 | DRIEHAUS CAPITAL MANAGEMENT LLC | 488K | $52.5M | β | 0.834% | 0.39% |
| 24 | JENNISON ASSOCIATES LLC | 487K | $52.4M | β | 0.832% | 0.04% |
| 25 | WESTFIELD CAPITAL MANAGEMENT CO LP | 482K | $51.9M | β | 0.824% | 0.22% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). β% of Fundβ shows how much of that investorβs total 13F portfolio is invested in GKOS β a direct measure of their conviction.
Filings activity in GKOS during Q1 2026, grouped by how each filer changed its position.
Institutions that opened a new GKOS position in Q1 2026
Institutions that fully closed their GKOS position in Q1 2026
8 quarters of 13F filings Β· Ξ columns show change vs prior quarter
| Quarter | Inst. Holders | Ξ Holders | Ownership % | Ξ Ownership | Total 13F Value | Ξ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 331 | +1.5% | 80.76% | 4.82 pp | $5.99B | 5.6% |
| Q4 2025 | 326 | +6.9% | 85.58% | +25.76 pp | $6.35B | +43% |
| Q3 2025 | 305 | +4.1% | 59.82% | 23.21 pp | $4.44B | 28% |
| Q2 2025 | 293 | 5.2% | 83.03% | +9.02 pp | $6.16B | +12% |
| Q1 2025 | 309 | 1.6% | 74.01% | 31.35 pp | $5.49B | 30% |
| Q4 2024 | 314 | +1.6% | 105.36% | +15.85 pp | $7.82B | +18% |
| Q3 2024 | 309 | +10% | 89.51% | +10.22 pp | $6.64B | +13% |
| Q2 2024 | 280 | β | 79.29% | β | $5.88B | β |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Ξ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying GKOS stock.
Based on Q1 2026 13F filings, institutional ownership of Glaukos Corporation stands at 80.8%, held across 331 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of GKOS, with approximately 9,090,029 shares worth $0.98B as of Q1 2026.
Yes β 1 widely-followed marquee investor appear among the top 25 institutional holders of GKOS, including CITADEL ADVISORS LLC.
Our composite Smart Money Score for GKOS is 40 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
53 institutions opened new positions in GKOS during Q1 2026, while 48 fully exited. 85 added to existing positions and 193 trimmed.
GKOS institutional ownership fell by 4.82 percentage points quarter-over-quarter, with a net change of +5 holders.
The top 10 institutions account for 56.8% of all reported 13F value in GKOS, and the top 25 account for 78.0%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Glaukos Corporation (GKOS) Institutional Ownership