Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
229 institutional managers reported holding BFLY for the quarter ended Mar 31, 2026. Together they hold about 54% of shares outstanding; the top 10 hold 33%. 50 opened new positions; 21 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| BlackRock | 15.96M | 6.22% | $64.3M | added +6.9% | 2021 Q1 |
| Glenview Capital (focused) | 14.34M | 5.59% | $57.8M | unchanged | 2021 Q1 |
| Vanguard Group | 11.73M | 4.58% | $47.3M | added +3.5% | 2021 Q1 |
| Fosun International LTD | 10.72M | 4.18% | $43.2M | unchanged | 2021 Q1 |
| Hood River Capital Management LLC | 8.62M | 3.36% | $34.7M | added +24% | 2025 Q1 |
| State Street | 5.54M | 2.16% | $22.3M | added +3.1% | 2021 Q2 |
| ARK Investment Management | 5.23M | 2.04% | $21.1M | trimmed -16.3% | 2021 Q1 |
| Geode Capital | 4.81M | 1.88% | $19.4M | added +2.8% | 2021 Q2 |
| AWM Investment Company, INC. | 4.43M | 1.73% | $17.9M | added +30.3% | 2025 Q1 |
| Bank OF America CORP /DE/ | 4.17M | 1.62% | $16.8M | added +71% | 2021 Q1 |
| Nuveen | 3.75M | 1.46% | $15.1M | added +579.2% | 2025 Q2 |
| Millennium Management | 3.49M | 1.36% | $14.1M | added +9.9% | 2023 Q3 |
| Algert Global LLC | 2.66M | 1.04% | $10.7M | added +596.6% | 2024 Q4 |
| First Light Asset Management, LLC (focused) | 2.66M | 1.04% | $10.7M | trimmed -5.4% | 2024 Q4 |
| Dimensional Fund Advisors | 2.36M | 0.92% | $9.5M | added +30.9% | 2024 Q4 |
| SEI Investments CO | 2.30M | 0.90% | $9.3M | added +30.6% | 2025 Q2 |
| Marshall Wace | 2.28M | 0.89% | $9.2M | added +444.3% | 2025 Q4 |
| Deutsche Bank AG\ | 2.26M | 0.88% | $9.1M | added +37% | 2025 Q1 |
| Jane Street | 1.94M | 0.76% | $7.8M | added +123.2% | 2022 Q3 |
| UBS | 1.80M | 0.70% | $7.2M | trimmed -17.2% | 2021 Q1 |
| Morgan Stanley | 1.72M | 0.67% | $6.9M | trimmed -26% | 2021 Q1 |
| Charles Schwab Investment Management | 1.68M | 0.65% | $6.8M | trimmed -5.4% | 2021 Q2 |
| Northern Trust | 1.56M | 0.61% | $6.3M | added +5.6% | 2021 Q2 |
| D. E. Shaw | 1.12M | 0.44% | $4.5M | added +1577.3% | 2025 Q4 |
| Perkins Capital Management INC | 930.9k | 0.36% | $3.8M | added +0.8% | 2025 Q1 |
| Raymond James Financial INC | 896.7k | 0.35% | $3.6M | added +9% | 2021 Q1 |
| Goldman Sachs | 852.2k | 0.33% | $3.4M | trimmed -11.5% | 2021 Q1 |
| Jump Financial | 832.6k | 0.33% | $3.4M | opened | 2026 Q1 |
| DNB Asset Management AS | 780.3k | 0.30% | $3.1M | unchanged | 2025 Q1 |
| Two Sigma | 757.2k | 0.29% | $3.1M | added +3605.1% | 2024 Q3 |
| Isthmus Partners, LLC | 689.2k | 0.27% | $2.8M | unchanged | 2021 Q1 |
| Citigroup INC | 593.9k | 0.23% | $2.4M | added +111.7% | 2021 Q2 |
| Stoic Point Capital Management LLC | 582.9k | 0.23% | $2.3M | trimmed -22.3% | 2025 Q4 |
| Parkman Healthcare Partners LLC | 544.5k | 0.21% | $2.2M | added +440% | 2025 Q3 |
| Barclays PLC | 486.1k | 0.19% | $2.0M | added +42.6% | 2022 Q1 |
| Gotham Asset Management | 462.2k | 0.18% | $1.9M | added +101.9% | 2025 Q4 |
| BNY Mellon | 447.6k | 0.17% | $1.8M | trimmed -9.7% | 2021 Q2 |
| FMR (Fidelity) | 440.0k | 0.17% | $1.8M | added +831.3% | 2021 Q1 |
| Tudor Investment | 431.5k | 0.17% | $1.7M | opened | 2026 Q1 |
| Polen Capital | 406.3k | 0.16% | $1.6M | trimmed -14.1% | 2025 Q2 |
| Invesco | 406.2k | 0.16% | $1.6M | added +4.7% | 2025 Q1 |
| Swiss National Bank | 401.2k | 0.16% | $1.6M | opened | 2026 Q1 |
| Voleon Capital Management LP | 393.7k | 0.15% | $1.6M | added +74.4% | 2025 Q3 |
| Palumbo Wealth Management LLC | 360.3k | 0.14% | $1.5M | trimmed -12.8% | 2024 Q3 |
| Squarepoint Ops LLC | 354.6k | 0.14% | $1.4M | trimmed -50.5% | 2024 Q3 |
| Oppenheimer & CO INC | 328.3k | 0.13% | $1.3M | trimmed -0.6% | 2023 Q1 |
| Manatuck Hill Partners, LLC | 300.0k | 0.12% | $1.2M | opened | 2026 Q1 |
| Captrust Financial Advisors | 282.1k | 0.11% | $1.1M | trimmed -1.5% | 2021 Q1 |
| Schonfeld Strategic Advisors | 268.1k | 0.10% | $1.1M | added +229.7% | 2024 Q1 |
| Rhumbline Advisers | 254.3k | 0.10% | $1.0M | added +2.2% | 2025 Q2 |
Largest 50 of 229 shown; the full ranked, searchable register is at boothcheck.com/holders/BFLY. 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.