Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
170 institutional managers reported holding WMK for the quarter ended Mar 31, 2026. Together they hold about 44% of shares outstanding; the top 10 hold 28%. 28 opened new positions; 24 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| Dimensional Fund Advisors | 2.01M | 8.11% | $136.7M | unchanged | ≤2013 |
| Vanguard Group | 1.52M | 6.13% | $103.3M | added +1.4% | ≤2013 |
| BlackRock | 1.12M | 4.51% | $76.1M | added +2.6% | ≤2013 |
| American Century Companies INC | 637.5k | 2.58% | $43.4M | added +8.9% | 2019 Q1 |
| State Street | 393.5k | 1.59% | $26.8M | trimmed -8.2% | ≤2013 |
| Charles Schwab Investment Management | 288.2k | 1.17% | $19.6M | trimmed -12.3% | ≤2013 |
| Geode Capital | 284.5k | 1.15% | $19.4M | added +2.2% | ≤2013 |
| BNY Mellon | 272.2k | 1.10% | $18.6M | added +0.6% | ≤2013 |
| Goldman Sachs | 241.4k | 0.97% | $16.5M | added +32.4% | ≤2013 |
| Allianz Asset Management GmbH | 237.1k | 0.96% | $16.2M | added +3.4% | 2017 Q1 |
| Two Sigma | 228.5k | 0.92% | $15.6M | added +32.4% | 2021 Q4 |
| Morgan Stanley | 202.3k | 0.82% | $13.8M | trimmed -2.1% | ≤2013 |
| Millennium Management | 192.7k | 0.78% | $13.1M | trimmed -26.5% | 2014 Q2 |
| Qube Research & Technologies LTD | 190.8k | 0.77% | $13.0M | trimmed -7.1% | 2025 Q3 |
| Renaissance Technologies | 176.4k | 0.71% | $12.0M | trimmed -8.6% | ≤2013 |
| Arrowstreet Capital | 171.9k | 0.69% | $11.7M | added +2228.4% | 2025 Q4 |
| Bridgeway Capital Management, LLC | 157.1k | 0.64% | $10.7M | added +12% | ≤2013 |
| DZ Bank AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main | 147.4k | 0.60% | $10.0M | trimmed -2% | 2023 Q2 |
| UBS | 137.6k | 0.56% | $9.4M | trimmed -36.8% | ≤2013 |
| Northern Trust | 121.5k | 0.49% | $8.3M | added +5% | ≤2013 |
| Empowered Funds, LLC | 119.5k | 0.48% | $8.1M | added +6.1% | 2023 Q2 |
| Tudor Investment | 115.0k | 0.47% | $7.8M | added +23.7% | 2025 Q3 |
| Citadel Advisors | 107.3k | 0.43% | $7.3M | opened | 2017 Q2 |
| Jane Street | 102.0k | 0.41% | $7.0M | trimmed -40.3% | 2022 Q4 |
| Hennessy Advisors INC | 101.5k | 0.41% | $6.9M | trimmed -3.3% | 2025 Q2 |
| Barclays PLC | 83.7k | 0.34% | $5.7M | added +291% | 2016 Q2 |
| Invesco | 77.9k | 0.32% | $5.3M | added +13.8% | ≤2013 |
| Bank OF America CORP /DE/ | 72.8k | 0.29% | $5.0M | added +69.3% | ≤2013 |
| D. E. Shaw | 68.9k | 0.28% | $4.7M | added +19.4% | 2023 Q4 |
| First Trust Advisors LP | 66.7k | 0.27% | $4.5M | added +50.2% | 2022 Q2 |
| AQR Capital | 62.7k | 0.25% | $4.3M | added +104.5% | 2024 Q2 |
| Creative Planning | 61.7k | 0.25% | $4.2M | added +50.4% | 2024 Q1 |
| Numerai GP LLC | 58.9k | 0.24% | $4.0M | opened | 2026 Q1 |
| Vestcor INC | 46.8k | 0.19% | $3.2M | added +63.9% | 2020 Q2 |
| ExodusPoint | 41.7k | 0.17% | $2.8M | added +125.2% | 2025 Q3 |
| BNP Paribas Financial Markets | 39.6k | 0.16% | $2.7M | trimmed -47.4% | 2014 Q2 |
| Linden Thomas Advisory Services, LLC | 36.0k | 0.14% | $2.5M | added +44.8% | 2022 Q4 |
| Edgestream Partners, L.p. | 35.2k | 0.14% | $2.4M | trimmed -33.4% | 2025 Q4 |
| Nuveen | 34.5k | 0.14% | $2.4M | added +0.7% | 2019 Q2 |
| Y-Intercept (Hong Kong) LTD | 32.8k | 0.13% | $2.2M | opened | 2026 Q1 |
| Balyasny Asset Management | 30.4k | 0.12% | $2.1M | opened | 2026 Q1 |
| Dark Forest Capital Management LP | 30.4k | 0.12% | $2.1M | trimmed -23.9% | 2025 Q1 |
| Martin & CO INC /TN/ | 30.0k | 0.12% | $2.0M | added +1.7% | 2016 Q1 |
| Swiss National Bank | 26.8k | 0.11% | $1.8M | unchanged | ≤2013 |
| Martingale Asset Management L P | 24.9k | 0.10% | $1.7M | added +15.2% | 2018 Q3 |
| Susquehanna Portfolio Strategies, LLC | 24.3k | 0.10% | $1.7M | added +179% | 2025 Q3 |
| Rhumbline Advisers | 21.8k | 0.09% | $1.5M | trimmed -2.8% | ≤2013 |
| Point72 | 20.1k | 0.08% | $1.4M | added +240.1% | 2025 Q4 |
| M&T Bank CORP | 20.0k | 0.08% | $1.4M | trimmed -4.6% | ≤2013 |
| HRT Financial LP | 18.2k | 0.07% | $1.2M | trimmed -40.6% | 2023 Q2 |
Largest 50 of 170 shown; the full ranked, searchable register is at boothcheck.com/holders/WMK. 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.