Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
516 institutional managers reported holding WBS for the quarter ended Mar 31, 2026. Together they hold about 91% of shares outstanding; the top 10 hold 41%. 104 opened new positions; 113 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| Vanguard Group | 16.13M | 10.09% | $1.12B | trimmed -2.4% | ≤2013 |
| BlackRock | 14.94M | 9.34% | $1.04B | unchanged | ≤2013 |
| Dimensional Fund Advisors | 6.33M | 3.96% | $439.3M | trimmed -20.1% | ≤2013 |
| State Street | 5.98M | 3.74% | $415.2M | trimmed -6% | ≤2013 |
| Invesco | 5.14M | 3.22% | $357.1M | trimmed -6.8% | ≤2013 |
| Millennium Management | 4.40M | 2.75% | $305.3M | added +984.6% | 2017 Q1 |
| Bank OF America CORP /DE/ | 3.73M | 2.33% | $258.8M | added +67.6% | ≤2013 |
| UBS | 3.23M | 2.02% | $224.0M | added +222% | ≤2013 |
| Geode Capital | 3.17M | 1.99% | $220.4M | added +2.7% | ≤2013 |
| Tudor Investment | 3.08M | 1.93% | $213.8M | added +2313.7% | 2023 Q3 |
| Goldman Sachs | 3.03M | 1.90% | $210.6M | added +318.5% | ≤2013 |
| AQR Capital | 2.98M | 1.86% | $206.6M | added +175.1% | 2023 Q4 |
| Morgan Stanley | 2.24M | 1.40% | $155.4M | added +18.9% | ≤2013 |
| Earnest Partners LLC | 2.23M | 1.40% | $155.0M | trimmed -28.9% | 2018 Q2 |
| Balyasny Asset Management | 2.17M | 1.36% | $150.6M | added +346.6% | 2016 Q4 |
| FMR (Fidelity) | 2.16M | 1.35% | $149.8M | trimmed -72.1% | 2014 Q4 |
| Whitebox Advisors LLC | 1.93M | 1.20% | $133.7M | opened | 2026 Q1 |
| Toronto Dominion Bank | 1.91M | 1.19% | $132.6M | added +190898100% | 2025 Q4 |
| Pentwater Capital Management LP | 1.87M | 1.17% | $129.6M | opened | 2026 Q1 |
| Westchester Capital Management, LLC | 1.83M | 1.15% | $127.3M | opened | 2026 Q1 |
| SEI Investments CO | 1.59M | 1.00% | $110.6M | trimmed -11.1% | ≤2013 |
| Assenagon Asset Management S.a. | 1.58M | 0.99% | $109.8M | opened | 2022 Q3 |
| Northern Trust | 1.41M | 0.88% | $98.1M | added +1.4% | ≤2013 |
| Healthcare OF Ontario Pension Plan Trust Fund | 1.39M | 0.87% | $96.7M | added +1397.4% | 2025 Q4 |
| BNY Mellon | 1.37M | 0.86% | $95.2M | trimmed -1.6% | ≤2013 |
| AllianceBernstein | 1.29M | 0.81% | $89.8M | trimmed -15.1% | ≤2013 |
| Basswood Capital Management, L.l.c. | 1.22M | 0.76% | $84.4M | trimmed -17.9% | 2022 Q1 |
| Hudson Bay Capital | 1.20M | 0.75% | $83.3M | opened | 2026 Q1 |
| Magnetar Financial LLC | 1.14M | 0.71% | $78.9M | added +14912% | 2025 Q3 |
| Charles Schwab Investment Management | 1.13M | 0.71% | $78.5M | added +3.3% | ≤2013 |
| Natixis Advisors, LLC | 1.13M | 0.71% | $78.4M | added +111.4% | 2021 Q4 |
| National Bank OF Canada /FI/ | 1.13M | 0.70% | $78.2M | added +3024.8% | 2025 Q1 |
| Citigroup INC | 1.12M | 0.70% | $77.7M | added +582.8% | ≤2013 |
| Barclays PLC | 1.10M | 0.69% | $76.1M | added +512.6% | ≤2013 |
| Citadel Advisors | 1.06M | 0.67% | $73.9M | trimmed -19.2% | 2017 Q1 |
| Nomura Asset Management International INC. | 991.1k | 0.62% | $68.8M | trimmed -57.7% | 2025 Q4 |
| Neuberger Berman Group LLC | 868.9k | 0.54% | $60.3M | added +3195.8% | 2021 Q4 |
| Clearbridge Investments, LLC | 864.0k | 0.54% | $60.0M | trimmed -2.5% | 2022 Q1 |
| First Trust Advisors LP | 854.6k | 0.54% | $59.3M | added +78.8% | ≤2013 |
| Capstone Investment Advisors, LLC | 849.5k | 0.53% | $59.0M | opened | 2026 Q1 |
| Public Sector Pension Investment Board | 803.7k | 0.50% | $55.8M | opened | 2026 Q1 |
| Systematic Financial Management LP | 726.1k | 0.45% | $50.4M | trimmed -28.7% | ≤2013 |
| Qube Research & Technologies LTD | 712.6k | 0.45% | $49.5M | added +5.8% | 2023 Q3 |
| Soros Fund Management | 711.8k | 0.45% | $49.4M | opened | 2026 Q1 |
| Alberta Investment Management CORP | 700.0k | 0.44% | $48.6M | opened | 2026 Q1 |
| Caxton Associates LLP | 680.7k | 0.43% | $47.3M | opened | 2026 Q1 |
| Bank OF Nova Scotia | 670.2k | 0.42% | $46.5M | added +840.9% | 2025 Q4 |
| Verition Fund Management | 660.3k | 0.41% | $45.8M | trimmed -33.2% | 2020 Q3 |
| ExodusPoint | 647.2k | 0.41% | $44.9M | added +217.8% | 2024 Q4 |
| Hsbc Holdings PLC | 637.6k | 0.40% | $44.3M | added +4807.2% | 2021 Q3 |
Largest 50 of 516 shown; the full ranked, searchable register is at boothcheck.com/holders/WBS. 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.