Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
171 institutional managers reported holding ESTA for the quarter ended Mar 31, 2026. Together they hold about 88% of shares outstanding; the top 10 hold 44%. 29 opened new positions; 31 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| JW Asset Management, LLC (focused) | 3.06M | 10.22% | $173.8M | unchanged | 2018 Q3 |
| RTW Investments, LP | 2.66M | 8.87% | $150.7M | added +2.6% | 2018 Q3 |
| Brown Advisory INC | 1.53M | 5.10% | $86.6M | trimmed -23.4% | 2019 Q4 |
| Tyro Capital Management LLC (focused) | 1.15M | 3.84% | $65.3M | added +6.9% | 2025 Q1 |
| Findell Capital Management LLC (focused) | 997.7k | 3.33% | $56.6M | trimmed -11.7% | 2023 Q4 |
| Bamco INC /NY/ | 964.2k | 3.22% | $54.7M | unchanged | 2021 Q2 |
| Nantahala Capital Management, LLC | 833.0k | 2.78% | $47.3M | trimmed -15.7% | 2018 Q3 |
| Mudita Advisors LLP (focused) | 764.6k | 2.55% | $43.4M | added +9.3% | 2021 Q4 |
| William Blair Investment Management, LLC | 688.9k | 2.30% | $39.1M | added +7.7% | 2024 Q1 |
| Goldman Sachs | 632.3k | 2.11% | $35.9M | trimmed -22.1% | 2020 Q4 |
| Jane Street | 627.7k | 2.10% | $35.6M | added +76.6% | 2025 Q3 |
| Citadel Advisors | 549.3k | 1.83% | $31.2M | added +175.2% | 2020 Q4 |
| Rice Hall James & Associates, LLC | 548.7k | 1.83% | $31.1M | trimmed -15.8% | 2020 Q2 |
| Toronto Dominion Bank | 540.0k | 1.80% | $30.6M | unchanged | 2024 Q4 |
| Braidwell LP | 463.6k | 1.55% | $26.3M | opened | 2026 Q1 |
| Two Sigma | 431.5k | 1.44% | $24.5M | added +47.6% | 2025 Q3 |
| Royce & Associates | 427.5k | 1.43% | $24.3M | added +19.2% | 2024 Q4 |
| Bank OF America CORP /DE/ | 416.8k | 1.39% | $23.7M | added +56.7% | 2021 Q2 |
| D. E. Shaw | 407.8k | 1.36% | $23.1M | trimmed -16.4% | 2025 Q2 |
| Morgan Stanley | 406.3k | 1.36% | $23.1M | added +7.4% | 2018 Q3 |
| Summit Partners Public Asset Management, LLC | 392.8k | 1.31% | $22.3M | unchanged | 2024 Q1 |
| Millennium Management | 368.3k | 1.23% | $20.9M | added +1889.9% | 2025 Q3 |
| Woodson Capital Management, LP (focused) | 350.0k | 1.17% | $19.9M | trimmed -6.7% | 2025 Q2 |
| Nuveen | 322.7k | 1.08% | $18.3M | trimmed -8.4% | 2020 Q1 |
| Tejara Capital LTD | 308.6k | 1.03% | $17.5M | added +146.3% | 2025 Q1 |
| First Light Asset Management, LLC (focused) | 307.7k | 1.03% | $17.5M | trimmed -17.5% | 2025 Q1 |
| Gilder Gagnon Howe & CO LLC | 268.5k | 0.90% | $15.2M | added +57.3% | 2025 Q4 |
| Garnet Equity Capital Holdings, INC. (focused) | 264.4k | 0.88% | $15.0M | added +32.8% | 2025 Q2 |
| Franklin Resources | 239.2k | 0.80% | $13.6M | added +67.8% | 2025 Q4 |
| Boothbay Fund Management, LLC | 232.0k | 0.78% | $13.2M | trimmed -22.5% | 2023 Q1 |
| Marshall Wace | 231.4k | 0.77% | $13.1M | added +16.7% | 2022 Q3 |
| Qube Research & Technologies LTD | 228.6k | 0.76% | $13.0M | opened | 2026 Q1 |
| Raymond James Financial INC | 215.6k | 0.72% | $12.2M | added +2.9% | 2024 Q2 |
| Adar1 Capital Management, LLC | 213.5k | 0.71% | $12.1M | added +24.5% | 2024 Q3 |
| BNP Paribas Financial Markets | 206.8k | 0.69% | $11.7M | added +5.4% | 2021 Q2 |
| UBS | 196.1k | 0.66% | $11.1M | added +118.5% | 2019 Q1 |
| Tudor Investment | 171.4k | 0.57% | $9.7M | trimmed -2.8% | 2025 Q4 |
| Granite Investment Partners, LLC | 143.5k | 0.48% | $8.1M | trimmed -5.2% | 2025 Q1 |
| State OF Wisconsin Investment Board | 138.5k | 0.46% | $7.9M | trimmed -8.6% | 2024 Q1 |
| Trexquant Investment LP | 135.9k | 0.45% | $7.7M | added +13.3% | 2025 Q4 |
| CenterBook Partners LP | 135.0k | 0.45% | $7.7M | added +142.7% | 2025 Q2 |
| Pier Capital, LLC | 133.6k | 0.45% | $7.6M | trimmed -7.1% | 2025 Q2 |
| Voleon Capital Management LP | 128.6k | 0.43% | $7.3M | added +5.9% | 2025 Q3 |
| BlackRock | 127.5k | 0.43% | $7.2M | added +4.9% | 2018 Q3 |
| Kornitzer Capital Management INC /KS | 116.6k | 0.39% | $6.6M | trimmed -1.9% | 2018 Q3 |
| Barclays PLC | 108.9k | 0.36% | $6.2M | added +89.6% | 2023 Q2 |
| HRT Financial LP | 108.8k | 0.36% | $6.2M | added +3.6% | 2025 Q4 |
| Redmile Group, LLC (focused) | 103.5k | 0.34% | $5.9M | trimmed -8.2% | 2024 Q1 |
| Capital Research Global Investors | 102.9k | 0.34% | $5.8M | trimmed -87.3% | 2024 Q1 |
| Deutsche Bank AG\ | 101.5k | 0.34% | $5.8M | trimmed -47.8% | 2021 Q2 |
Largest 50 of 171 shown; the full ranked, searchable register is at boothcheck.com/holders/ESTA. 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.