PRIMECAP MANAGEMENT CO/CA/
Holdings in BIIB
Position Over Time
| Report Date | Value (USD) | Shares | Type | Discretion | Filed |
|---|---|---|---|---|---|
| 2025-12-31 | $2,597,259,892 | 14,757,997 | Shares | Sole | 2026-02-11 |
| 2025-09-30 | $2,094,853,955 | 14,954,697 | Shares | Sole | 2025-11-12 |
| 2025-06-30 | $1,984,588,501 | 15,802,122 | Shares | Sole | 2025-08-11 |
| 2025-03-31 | $2,181,675,561 | 15,943,259 | Shares | Sole | 2025-05-09 |
| 2024-12-31 | $2,453,786,280 | 16,046,209 | Shares | Sole | 2025-02-10 |
| 2024-09-30 | $3,162,514,913 | 16,315,079 | Shares | Sole | 2024-11-08 |
| 2024-06-30 | $3,787,543,315 | 16,338,294 | Shares | Sole | 2024-08-09 |
| 2024-03-31 | $3,497,672,991 | 16,220,716 | Shares | Sole | 2024-05-14 |
| 2023-12-31 | $4,208,759,748 | 16,264,481 | Shares | Sole | 2024-02-09 |
| 2023-09-30 | $4,115,389,587 | 16,012,566 | Shares | Sole | 2023-11-13 |
| 2023-06-30 | $4,564,970,778 | 16,025,876 | Shares | Sole | 2023-08-11 |
| 2023-03-31 | $4,448,804,182 | 16,001,166 | Shares | Sole | 2023-05-15 |
| 2022-12-31 | $4,347,803,505 | 15,700,576 | Shares | Sole | 2023-02-13 |
| 2022-09-30 | $4,203,037,905 | 15,741,715 | Shares | Sole | 2022-11-14 |
| 2022-06-30 | $3,207,267,712 | 15,726,526 | Shares | Sole | 2022-08-11 |
| 2022-03-31 | $3,334,768,023 | 15,834,606 | Shares | Sole | 2022-05-11 |
| 2021-12-31 | $3,780,516,607 | 15,757,405 | Shares | Sole | 2022-02-11 |
| 2021-09-30 | $4,601,110,355 | 16,258,915 | Shares | Sole | 2021-11-12 |
| 2021-06-30 | $5,699,086,872 | 16,458,506 | Shares | Sole | 2021-08-10 |
| 2021-03-31 | $4,688,122,116 | 16,758,256 | Shares | Sole | 2021-05-14 |
| 2020-12-31 | $3,874,191,080 | 15,822,066 | Shares | Sole | 2021-02-08 |
| 2020-09-30 | $4,452,840,990 | 15,696,704 | Shares | Sole | 2020-11-13 |
| 2020-06-30 | $4,182,323,406 | 15,631,932 | Shares | Sole | 2020-08-13 |
| 2020-03-31 | $5,051,319,599 | 15,965,989 | Shares | Sole | 2020-05-14 |