| Quarter | Action | Shares change | Est. value change | Δ Own | Shares held | Filing date |
|---|---|---|---|---|---|---|
| Q1 2026 | Reduced | −196K | −$36M | −49.0% | 203K | May 14, 2026 |
| Q4 2025 | Reduced | −565K | −$92M | −58.6% | 399K | Feb 12, 2026 |
| Q3 2025 | Reduced | −81K | −$11M | −7.7% | 964K | Nov 13, 2025 |
| Q2 2025 | Added | +241K | +$30M | +29.9% | 1.0M | Aug 13, 2025 |
| Q1 2025 | Reduced | −388K | −$55M | −32.5% | 805K | May 14, 2025 |
| Q4 2024 | Added | +240K | +$40M | +25.1% | 1.2M | Feb 13, 2025 |
| Q3 2024 | Added | +335K | +$70M | +54.1% | 953K | Nov 13, 2024 |
| Q2 2024 | Reduced | −267K | −$58M | −30.1% | 618K | Aug 9, 2024 |
| Q1 2024 | Added | +126K | +$30M | +16.6% | 885K | May 13, 2024 |
| Q4 2023 | Reduced | −328K | −$81M | −30.2% | 759K | Feb 13, 2024 |
| Q3 2023 | Reduced | −23K | −$6.2M | −2.1% | 1.1M | Nov 14, 2023 |
| Q2 2023 | Reduced | −154K | −$46M | −12.2% | 1.1M | Aug 11, 2023 |
| Q1 2023 | Added | +264K | +$73M | +26.3% | 1.3M | May 12, 2023 |
| Q4 2022 | Reduced | −154K | −$44M | −13.4% | 1.0M | Feb 13, 2023 |
| Q3 2022 | First covered | – | – | – | 1.2M | Nov 14, 2022 |
| Q2 2022 | Added | +502K | +$103M | +48.1% | 1.5M | Aug 12, 2022 |
| Q1 2022 | Reduced | −30K | −$6.4M | −2.8% | 1.0M | May 13, 2022 |
| Q4 2021 | Added | +92K | +$24M | +9.4% | 1.1M | Feb 11, 2022 |
| Q3 2021 | Reduced | −348K | −$114M | −26.2% | 982K | Nov 12, 2021 |
| Q2 2021 | First covered | – | – | – | 1.3M | Aug 13, 2021 |
| Q1 2021 | First covered | – | – | – | 1.9M | May 13, 2021 |
Yes. As of Q1 2026, Jim Simons disclosed 203K shares of BIIB, worth $37M. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.
Jim Simons held BIIB since at least Q1 2021, when this filing coverage begins; the opening snapshot is not a disclosed purchase. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.
The quarter-by-quarter table above shows each sale and reduction Jim Simons disclosed in BIIB. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.
Jim Simons disclosed 203K shares of BIIB as of Q1 2026. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.
Jim Simons began building the BIIB position before our 13F history starts, so an exact average buy price cannot be estimated without understating it. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.
13F filings disclose quarter-end holdings, not trade dates or execution prices. These estimates use each covered quarter's average market price; the add average excludes the opening position and quarters without price data. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.
