Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
501 institutional managers reported holding WTS for the quarter ended Mar 31, 2026. Together they hold about 79% of shares outstanding; the top 10 hold 42%. 60 opened new positions; 38 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| BlackRock | 3.67M | 10.97% | $1.07B | added +1.9% | ≤2013 |
| Vanguard Group | 3.13M | 9.33% | $908.3M | added +1.5% | ≤2013 |
| Kayne Anderson Rudnick Investment Management LLC | 2.13M | 6.35% | $618.2M | trimmed -0.9% | 2020 Q3 |
| State Street | 991.1k | 2.96% | $288.0M | added +1.5% | ≤2013 |
| Geode Capital | 918.9k | 2.74% | $267.0M | added +10.4% | ≤2013 |
| T. Rowe Price | 868.8k | 2.59% | $252.5M | added +7.6% | ≤2013 |
| Boston Partners | 755.9k | 2.26% | $219.7M | trimmed -15.2% | 2024 Q3 |
| Impax Asset Management Group plc | 588.0k | 1.75% | $170.9M | trimmed -9.2% | ≤2013 |
| First Trust Advisors LP | 545.4k | 1.63% | $158.5M | added +6.7% | ≤2013 |
| Dimensional Fund Advisors | 521.3k | 1.56% | $151.5M | unchanged | ≤2013 |
| Invesco | 471.2k | 1.41% | $136.9M | added +3.2% | ≤2013 |
| Mirova US LLC | 440.4k | 1.31% | $128.0M | trimmed -7.3% | 2018 Q4 |
| AQR Capital | 422.6k | 1.26% | $122.8M | added +34.5% | 2016 Q2 |
| Gamco Investors, INC. et al | 404.1k | 1.21% | $117.4M | trimmed -5.1% | ≤2013 |
| Charles Schwab Investment Management | 384.6k | 1.15% | $111.8M | unchanged | ≤2013 |
| Boston Trust Walden CORP | 379.0k | 1.13% | $110.1M | trimmed -13.4% | 2018 Q1 |
| Northern Trust | 361.0k | 1.08% | $104.9M | added +1.8% | ≤2013 |
| Goldman Sachs | 281.4k | 0.84% | $81.8M | trimmed -0.5% | ≤2013 |
| Neuberger Berman Group LLC | 266.0k | 0.79% | $77.3M | added +184.1% | 2024 Q2 |
| Port Capital LLC | 257.4k | 0.77% | $74.8M | unchanged | 2023 Q3 |
| Cartenna Capital, LP (focused) | 240.0k | 0.72% | $69.7M | added +9.1% | 2025 Q3 |
| BNY Mellon | 228.3k | 0.68% | $66.3M | trimmed -2.2% | ≤2013 |
| Lazard Asset Management LLC | 218.8k | 0.65% | $63.6M | added +79.8% | 2019 Q4 |
| KBC Group NV | 214.8k | 0.64% | $62.4M | trimmed -2.9% | 2014 Q4 |
| Wells Fargo & COMPANY/MN | 212.3k | 0.63% | $61.7M | trimmed -12.3% | ≤2013 |
| Morgan Stanley | 198.5k | 0.59% | $57.7M | trimmed -9.7% | ≤2013 |
| BNP Paribas Financial Markets | 197.7k | 0.59% | $57.5M | added +22.7% | ≤2013 |
| Birch Hill Investment Advisors LLC | 189.3k | 0.56% | $55.0M | unchanged | 2019 Q4 |
| Victory Capital Management INC | 159.1k | 0.47% | $46.2M | trimmed -6.8% | 2013 Q3 |
| Amundi | 156.7k | 0.47% | $45.5M | trimmed -4.2% | 2022 Q3 |
| GAMCO (Gabelli) | 154.0k | 0.46% | $44.8M | trimmed -1.8% | ≤2013 |
| UBS | 150.9k | 0.45% | $43.9M | trimmed -9.5% | ≤2013 |
| Raymond James Financial INC | 150.2k | 0.45% | $43.7M | added +3.1% | 2020 Q4 |
| AE Wealth Management LLC | 145.5k | 0.43% | $42.3M | trimmed -15% | 2022 Q3 |
| Livforsakringsbolaget Skandia, Omsesidigt | 141.2k | 0.42% | $41.0M | added +20071.4% | 2025 Q4 |
| Renaissance Technologies | 135.1k | 0.40% | $39.3M | added +58.7% | 2015 Q1 |
| Bank OF America CORP /DE/ | 133.8k | 0.40% | $38.9M | added +21.1% | ≤2013 |
| Eulav Asset Management | 128.9k | 0.39% | $37.4M | added +12.4% | 2017 Q2 |
| Polar Capital Holdings PLC | 126.5k | 0.38% | $36.8M | added +179.6% | 2025 Q2 |
| Nuveen | 123.1k | 0.37% | $35.8M | trimmed -7.6% | 2019 Q2 |
| Algert Global LLC | 116.5k | 0.35% | $33.9M | trimmed -8.5% | 2021 Q3 |
| Legal & General Group PLC | 103.6k | 0.31% | $30.1M | trimmed -6.5% | ≤2013 |
| Allianz Asset Management GmbH | 94.8k | 0.28% | $27.5M | trimmed -55.9% | 2022 Q3 |
| Deutsche Bank AG\ | 90.0k | 0.27% | $26.2M | added +46.2% | ≤2013 |
| Storebrand Asset Management AS | 89.5k | 0.27% | $26.0M | trimmed -8.3% | 2025 Q4 |
| Rhumbline Advisers | 88.6k | 0.27% | $25.8M | added +1.6% | ≤2013 |
| Triodos Investment Management BV (focused) | 86.0k | 0.26% | $25.0M | unchanged | 2024 Q3 |
| Jupiter Asset Management LTD | 84.3k | 0.25% | $24.5M | added +0.6% | ≤2013 |
| Principal Financial Group INC | 84.0k | 0.25% | $24.4M | added +2.6% | ≤2013 |
| Groupama Asset Managment | 82.6k | 0.25% | $24.0M | added +7.7% | 2023 Q4 |
Largest 50 of 501 shown; the full ranked, searchable register is at boothcheck.com/holders/WTS. 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.