Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
304 institutional managers reported holding WK for the quarter ended Mar 31, 2026. Together they hold about 83% of shares outstanding; the top 10 hold 42%. 42 opened new positions; 77 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| Vanguard Group | 6.66M | 11.39% | $397.1M | added +6.3% | 2015 Q1 |
| BlackRock | 4.64M | 7.93% | $276.6M | added +4.3% | 2015 Q1 |
| Eminence Capital (focused) | 2.52M | 4.31% | $150.3M | trimmed -32% | 2025 Q1 |
| Jericho Capital Asset Management L.p. (focused) | 2.47M | 4.22% | $147.1M | opened | 2026 Q1 |
| FMR (Fidelity) | 1.79M | 3.06% | $106.5M | added +28.5% | 2019 Q1 |
| Hotchkis & Wiley Capital Management LLC | 1.68M | 2.87% | $100.2M | added +43.6% | 2025 Q3 |
| State Street | 1.28M | 2.18% | $76.1M | added +2.9% | 2015 Q2 |
| UBS | 1.26M | 2.15% | $74.9M | trimmed -46.1% | 2014 Q4 |
| Geode Capital | 1.23M | 2.10% | $73.2M | added +2.9% | 2015 Q1 |
| Edmond DE Rothschild Holding S.a. | 1.22M | 2.09% | $72.9M | added +29.8% | 2025 Q2 |
| Arrowstreet Capital | 1.11M | 1.90% | $66.2M | added +88.5% | 2024 Q4 |
| Hawk Ridge Capital Management LP (focused) | 1.09M | 1.87% | $65.1M | opened | 2026 Q1 |
| Topline Capital Management, LLC (focused) | 1.05M | 1.80% | $62.6M | added +264.3% | 2025 Q2 |
| Fuller & Thaler Asset Management, INC. | 922.2k | 1.58% | $55.0M | added +3.2% | 2025 Q3 |
| First Trust Advisors LP | 862.9k | 1.48% | $51.5M | added +16.4% | 2019 Q2 |
| Goldman Sachs | 811.5k | 1.39% | $48.4M | added +170.6% | 2017 Q4 |
| Conestoga Capital Advisors, LLC | 754.6k | 1.29% | $45.0M | trimmed -30.3% | 2021 Q1 |
| Mairs & Power INC | 715.6k | 1.23% | $42.7M | trimmed -1.7% | 2015 Q4 |
| Citadel Advisors | 692.3k | 1.19% | $41.3M | added +74.7% | 2016 Q4 |
| Nomura Asset Management International INC. | 656.6k | 1.12% | $39.2M | trimmed -10.9% | 2025 Q4 |
| Riverbridge Partners LLC | 651.2k | 1.11% | $38.8M | trimmed -43.5% | 2018 Q1 |
| Squarepoint Ops LLC | 592.0k | 1.01% | $35.3M | added +1038.6% | 2023 Q1 |
| Irenic Capital Management LP (focused) | 552.0k | 0.94% | $32.9M | unchanged | 2025 Q3 |
| T. Rowe Price | 539.0k | 0.92% | $32.1M | trimmed -48.6% | 2018 Q1 |
| Loomis Sayles & CO L P | 514.9k | 0.88% | $30.7M | added +13.6% | 2023 Q2 |
| Nuveen | 487.9k | 0.83% | $29.1M | trimmed -2.4% | 2019 Q2 |
| Northern Trust | 482.6k | 0.83% | $28.8M | trimmed -4.3% | 2015 Q1 |
| TimesSquare Capital Management, LLC | 446.4k | 0.76% | $26.6M | trimmed -11.2% | 2021 Q3 |
| Charles Schwab Investment Management | 427.2k | 0.73% | $25.5M | trimmed -1% | 2015 Q2 |
| Bank OF America CORP /DE/ | 394.9k | 0.68% | $23.6M | trimmed -1.7% | 2014 Q4 |
| Qube Research & Technologies LTD | 363.3k | 0.62% | $21.7M | added +314.1% | 2023 Q3 |
| Goldentree Asset Management LP (focused) | 358.2k | 0.61% | $21.4M | opened | 2026 Q1 |
| Ranger Investment Management, L.p. | 342.2k | 0.59% | $20.4M | added +11.5% | 2018 Q4 |
| AQR Capital | 336.3k | 0.57% | $20.1M | trimmed -35.6% | 2023 Q3 |
| Jane Street | 307.3k | 0.53% | $18.3M | added +58% | 2019 Q3 |
| Morgan Stanley | 302.3k | 0.52% | $18.0M | trimmed -76.1% | 2014 Q4 |
| Ameriprise Financial INC | 273.7k | 0.47% | $16.3M | trimmed -14.9% | 2018 Q4 |
| Tetragon Partners GP LTD (focused) | 250.0k | 0.43% | $14.9M | added +66.7% | 2025 Q2 |
| Two Sigma | 238.4k | 0.41% | $14.2M | added +927.7% | 2016 Q3 |
| BNY Mellon | 227.4k | 0.39% | $13.6M | trimmed -2.3% | 2015 Q1 |
| Pembroke Management, LTD | 224.9k | 0.39% | $13.4M | trimmed -52.6% | 2025 Q3 |
| Royal Bank OF Canada | 223.3k | 0.38% | $13.3M | trimmed -24.9% | 2015 Q1 |
| Renaissance Technologies | 209.1k | 0.36% | $12.5M | trimmed -25.1% | 2015 Q4 |
| Lakehouse Capital Pty LTD (focused) | 184.1k | 0.32% | $11.0M | added +21.1% | 2025 Q4 |
| Tudor Investment | 179.6k | 0.31% | $10.7M | added +1345.2% | 2025 Q2 |
| Janus Henderson | 173.2k | 0.30% | $10.3M | trimmed -23.1% | 2021 Q3 |
| Trexquant Investment LP | 169.6k | 0.29% | $10.1M | added +44.8% | 2023 Q2 |
| Impax Asset Management Group plc | 162.1k | 0.28% | $9.7M | added +19.1% | 2020 Q1 |
| Private Wealth Asset Management, LLC | 158.0k | 0.27% | $9.4M | trimmed -9.8% | 2025 Q1 |
| Praesidium Investment Management Company, LLC (focused) | 150.4k | 0.26% | $9.0M | added +7.1% | 2025 Q3 |
Largest 50 of 304 shown; the full ranked, searchable register is at boothcheck.com/holders/WK. 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.