Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
966 institutional managers reported holding IBKR for the quarter ended Mar 31, 2026. Together they hold about 83% of shares outstanding; the top 10 hold 38%. 129 opened new positions; 118 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| Vanguard Group | 47.64M | 10.62% | $3.19B | trimmed -8.9% | ≤2013 |
| BlackRock | 31.38M | 7.00% | $2.10B | trimmed -1% | ≤2013 |
| State Street | 19.09M | 4.26% | $1.28B | added +1.4% | ≤2013 |
| FMR (Fidelity) | 12.50M | 2.79% | $838.0M | added +159.9% | ≤2013 |
| Cantillon Capital Management LLC (focused) | 11.25M | 2.51% | $753.9M | trimmed -11.9% | 2017 Q2 |
| Geode Capital | 10.44M | 2.33% | $700.1M | added +2.4% | ≤2013 |
| Kayne Anderson Rudnick Investment Management LLC | 10.02M | 2.23% | $671.4M | trimmed -10.6% | 2017 Q1 |
| Greenwich Wealth Management LLC | 9.92M | 2.21% | $665.3M | added +8% | ≤2013 |
| Wellington Management | 9.77M | 2.18% | $655.3M | added +18% | 2022 Q2 |
| Invesco | 9.65M | 2.15% | $646.7M | added +16.4% | ≤2013 |
| Two Sigma | 8.31M | 1.85% | $557.3M | added +135.7% | 2022 Q3 |
| Egerton Capital (focused) | 6.28M | 1.40% | $420.7M | trimmed -9.6% | 2024 Q1 |
| Bank OF America CORP /DE/ | 6.23M | 1.39% | $417.6M | trimmed -6.6% | ≤2013 |
| Orbis Allan Gray LTD | 6.12M | 1.36% | $410.1M | trimmed -34% | 2021 Q4 |
| London & Capital Asset Management LTD | 5.92M | 1.32% | $396.6M | added +0.9% | 2025 Q2 |
| American Century Companies INC | 5.74M | 1.28% | $385.1M | unchanged | 2021 Q4 |
| Morgan Stanley | 4.77M | 1.06% | $319.5M | added +5.4% | ≤2013 |
| 1832 Asset Management L.p. | 4.45M | 0.99% | $298.6M | trimmed -11.4% | 2020 Q4 |
| UBS | 4.39M | 0.98% | $294.2M | trimmed -0.5% | ≤2013 |
| Bamco INC /NY/ | 4.05M | 0.90% | $271.3M | trimmed -12.8% | 2023 Q1 |
| Jacobs Levy Equity Management, INC | 3.93M | 0.88% | $263.5M | trimmed -18.3% | 2022 Q3 |
| Bessemer Group INC | 3.92M | 0.88% | $263.0M | added +156% | 2021 Q3 |
| Neuberger Berman Group LLC | 3.73M | 0.83% | $250.2M | trimmed -19.1% | 2017 Q1 |
| Charles Schwab Investment Management | 3.59M | 0.80% | $240.8M | added +6.2% | ≤2013 |
| Northern Trust | 3.56M | 0.79% | $238.8M | added +1.2% | ≤2013 |
| Goldman Sachs | 3.22M | 0.72% | $216.0M | added +27.9% | ≤2013 |
| Capital Group (American Funds) | 3.03M | 0.68% | $203.2M | opened | 2026 Q1 |
| Wells Fargo & COMPANY/MN | 2.89M | 0.64% | $193.7M | trimmed -7.7% | ≤2013 |
| Legal & General Group PLC | 2.51M | 0.56% | $168.0M | added +19.1% | ≤2013 |
| TD Asset Management INC | 2.47M | 0.55% | $165.5M | added +3.6% | 2024 Q4 |
| Amundi | 2.43M | 0.54% | $163.1M | added +62.4% | 2019 Q1 |
| First Trust Advisors LP | 2.30M | 0.51% | $154.1M | trimmed -12.8% | 2021 Q3 |
| BNY Mellon | 2.28M | 0.51% | $153.0M | trimmed -9.8% | ≤2013 |
| Barclays PLC | 2.27M | 0.51% | $151.9M | added +34.2% | ≤2013 |
| Progeny 3, INC. (focused) | 2.20M | 0.49% | $147.2M | added +3.1% | 2024 Q3 |
| KBC Group NV | 2.12M | 0.47% | $141.8M | unchanged | 2023 Q2 |
| Raymond James Financial INC | 1.78M | 0.40% | $119.0M | trimmed -7.5% | 2015 Q3 |
| Jane Street | 1.77M | 0.39% | $118.5M | added +162.8% | 2021 Q1 |
| Royal Bank OF Canada | 1.68M | 0.38% | $112.8M | trimmed -21.2% | 2013 Q4 |
| FIL LTD | 1.51M | 0.34% | $101.4M | added +3.6% | 2022 Q4 |
| Ensign Peak Advisors, INC | 1.48M | 0.33% | $99.0M | trimmed -11.1% | 2019 Q4 |
| Lord, Abbett & CO. LLC | 1.46M | 0.33% | $98.1M | added +958.9% | 2024 Q3 |
| TimesSquare Capital Management, LLC | 1.45M | 0.32% | $97.3M | unchanged | 2021 Q3 |
| Viking Global | 1.39M | 0.31% | $93.5M | opened | 2026 Q1 |
| Robeco Institutional Asset Management B.v. | 1.33M | 0.30% | $88.9M | trimmed -4.3% | 2024 Q3 |
| Ancient Art, L.p. (focused) | 1.29M | 0.29% | $86.2M | trimmed -21.8% | ≤2013 |
| Bronte Capital Management Pty LTD. | 1.28M | 0.29% | $85.9M | trimmed -13.8% | 2018 Q4 |
| Nuveen | 1.27M | 0.28% | $84.9M | trimmed -0.9% | 2019 Q2 |
| BNP Paribas Financial Markets | 1.25M | 0.28% | $84.1M | trimmed -13.2% | 2014 Q1 |
| Hosking Partners LLP | 1.20M | 0.27% | $80.1M | trimmed -5.5% | 2023 Q2 |
Largest 50 of 966 shown; the full ranked, searchable register is at boothcheck.com/holders/IBKR. Related filers are grouped using the filings' own included-manager declarations. Historically, several managers opening new positions in the same quarter said almost nothing about the quarter that followed (59,118 cases since 2013). A filed record, not a forecast. Nothing here is investment advice.