Position in BIIB
as of Jun 30, 2026
· filed Aug 14, 2026
Position Value
$3,274,304,172
+$568,792,081 QoQ
Shares Held
15,154,606
+2.7% QoQ
Ownership
10.3%
of shares outstanding
% of Portfolio
1.94%
of 13F equity value
Holder Rank
#3
of 1,036 holders
Holding Since
Mar 2020
26 quarters on record
Voting authority
Sole 97%
Shared 0%
None 3%
Common Shares in BIIB Over Time
Shares Held
Position Value (USD)
Position in Drug Manufacturers - General
Healthcare · as of Jun 30, 2026PRIMECAP MANAGEMENT CO/CA/ holds $23,952,609,496 across 9 Drug Manufacturers - General names. BIIB ranks #3 (13.7% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | LLY |
ELI LILLY & Co
|
9,172,904 | $11,002,257,162 | |
| 2 | AZN |
Astrazeneca PLC
|
18,095,178 | $3,431,207,652 | |
| 3 | BIIB |
Biogen Inc.
This page
|
15,154,606 | $3,274,304,172 | |
| 4 | AMGN |
Amgen Inc
|
6,756,962 | $2,446,831,079 | |
| 5 | BMY |
Bristol Myers Squibb Co
|
24,923,900 | $1,436,115,118 | |
| 6 | GSK |
GSK plc
|
25,182,068 | $1,320,044,004 | |
| 7 | NVS |
Novartis AG
|
6,592,124 | $1,033,117,673 | |
| 8 | MRK |
Merck & Co., Inc.
|
35,700 | $4,587,450 |
All Filings in BIIB
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26 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-06-30 | $3,274,304,172 | 15,154,606 | Shares | Sole | 2026-08-14 | |
| 2026-03-31 | $2,705,512,091 | 14,757,607 | Shares | Sole | 2026-05-11 | |
| 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 | |
| No filing history on record for this holder in this stock. | ||||||