Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
232 institutional managers reported holding WGS for the quarter ended Mar 31, 2026. Reported positions total over 95% of shares outstanding; the top 10 hold 52%. 35 opened new positions; 89 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| Corvex Management LP (focused) | 3.23M | 11.00% | $207.5M | added +5.5% | 2021 Q3 |
| Casdin Capital, LLC (focused) | 3.01M | 10.25% | $193.3M | unchanged | 2021 Q3 |
| BlackRock | 1.55M | 5.29% | $99.7M | trimmed -0.6% | 2021 Q3 |
| Westfield Capital Management CO LP | 1.37M | 4.67% | $88.0M | added +34.5% | 2025 Q1 |
| Goldman Sachs | 1.33M | 4.55% | $85.8M | added +9.4% | 2021 Q3 |
| ARK Investment Management | 1.32M | 4.51% | $85.2M | added +119.1% | 2025 Q3 |
| Vanguard Group | 1.21M | 4.11% | $77.5M | added +1.4% | 2021 Q3 |
| William Blair Investment Management, LLC | 775.3k | 2.64% | $49.8M | trimmed -4.2% | 2024 Q4 |
| Zweig-DiMenna Associates LLC | 689.3k | 2.35% | $44.3M | added +15.3% | 2024 Q4 |
| Citadel Advisors | 647.4k | 2.21% | $41.6M | added +255% | 2021 Q3 |
| Amova Asset Management Americas, INC. | 638.8k | 2.18% | $41.1M | added +67.3% | 2025 Q3 |
| Sumitomo Mitsui Trust Group, INC. | 633.5k | 2.16% | $40.7M | added +65.9% | 2025 Q3 |
| Raymond James Financial INC | 610.1k | 2.08% | $39.2M | added +20.7% | 2024 Q2 |
| Franklin Resources | 607.2k | 2.07% | $39.0M | trimmed -44.4% | 2024 Q3 |
| Geode Capital | 549.1k | 1.87% | $35.3M | added +8.8% | 2021 Q3 |
| Invesco | 540.2k | 1.84% | $34.7M | trimmed -31.3% | 2024 Q3 |
| Morgan Stanley | 532.2k | 1.81% | $34.2M | added +5.2% | 2021 Q3 |
| Prosight Management, LP (focused) | 523.5k | 1.78% | $33.7M | added +851.8% | 2025 Q4 |
| Summit Partners Public Asset Management, LLC | 479.4k | 1.63% | $30.8M | trimmed -47.9% | 2024 Q3 |
| State Street | 472.4k | 1.61% | $30.4M | added +3.5% | 2021 Q3 |
| Eventide Asset Management, LLC | 459.0k | 1.56% | $29.5M | opened | 2026 Q1 |
| MFS Investment Management | 359.0k | 1.22% | $23.1M | added +80.5% | 2025 Q2 |
| Wellington Management | 341.0k | 1.16% | $21.9M | trimmed -11.4% | 2024 Q4 |
| Capital International Investors | 324.6k | 1.11% | $20.9M | added +14.6% | 2025 Q3 |
| BNY Mellon | 315.5k | 1.08% | $20.3M | added +38.6% | 2021 Q3 |
| Gagnon Securities LLC | 303.1k | 1.03% | $19.5M | added +19.6% | 2021 Q3 |
| UBS | 300.3k | 1.02% | $19.3M | trimmed -13.7% | 2021 Q3 |
| FMR (Fidelity) | 295.6k | 1.01% | $19.0M | trimmed -64.5% | 2021 Q3 |
| Dimensional Fund Advisors | 265.8k | 0.91% | $17.1M | added +143.4% | 2024 Q4 |
| Oberweis Asset Management INC/ | 261.4k | 0.89% | $16.8M | added +31.5% | 2024 Q2 |
| Vestal Point Capital, LP | 250.0k | 0.85% | $16.1M | opened | 2026 Q1 |
| First Light Asset Management, LLC (focused) | 242.9k | 0.83% | $15.6M | opened | 2026 Q1 |
| Science & Technology Partners, L.p. (focused) | 241.2k | 0.82% | $15.5M | added +19.8% | 2024 Q4 |
| Bank OF America CORP /DE/ | 234.6k | 0.80% | $15.1M | added +77.5% | 2021 Q3 |
| Aberdeen Group plc | 230.1k | 0.78% | $14.8M | opened | 2026 Q1 |
| Nomura Asset Management International INC. | 221.2k | 0.75% | $14.2M | trimmed -2.7% | 2025 Q4 |
| RA Capital Management, L.p. | 209.9k | 0.71% | $13.5M | added +261.6% | 2025 Q2 |
| Fred Alger Management, LLC | 202.8k | 0.69% | $13.0M | trimmed -24% | 2024 Q3 |
| Ameriprise Financial INC | 195.9k | 0.67% | $12.6M | added +67.3% | 2024 Q4 |
| Alamea Verwaltungs GmbH | 186.0k | 0.63% | $12.0M | unchanged | 2025 Q1 |
| Qube Research & Technologies LTD | 184.5k | 0.63% | $11.9M | added +144.7% | 2024 Q2 |
| Northern Trust | 175.8k | 0.60% | $11.3M | trimmed -11.5% | 2021 Q3 |
| Ashford Capital Management INC | 174.5k | 0.59% | $11.2M | added +31.9% | 2025 Q1 |
| Charles Schwab Investment Management | 170.6k | 0.58% | $11.0M | trimmed -3.6% | 2024 Q2 |
| Thrivent Financial for Lutherans | 153.7k | 0.52% | $9.9M | added +5572.4% | 2025 Q2 |
| Renaissance Technologies | 153.7k | 0.52% | $9.9M | added +168.2% | 2025 Q4 |
| Capital Research Global Investors | 151.1k | 0.52% | $9.7M | added +23.1% | 2025 Q4 |
| Millennium Management | 149.9k | 0.51% | $9.6M | added +127.3% | 2023 Q2 |
| Gagnon Advisors, LLC (focused) | 148.2k | 0.51% | $9.5M | added +16.7% | 2021 Q3 |
| Royce & Associates | 140.5k | 0.48% | $9.0M | added +85.4% | 2024 Q3 |
Largest 50 of 232 shown; the full ranked, searchable register is at boothcheck.com/holders/WGS. 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.