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PRIMECAP MANAGEMENT CO/CA/

Position in BIIB — Biogen Inc.

CIK 763212 PASADENA, CA

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, 2026

PRIMECAP 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
3 BIIB
Biogen Inc.
This page
15,154,606 $3,274,304,172

All Filings in BIIB

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26 filing rows on record
Report Date Value (USD) Shares
2026-06-30 $3,274,304,172 15,154,606
2026-03-31 $2,705,512,091 14,757,607
2025-12-31 $2,597,259,892 14,757,997
2025-09-30 $2,094,853,955 14,954,697
2025-06-30 $1,984,588,501 15,802,122
2025-03-31 $2,181,675,561 15,943,259
2024-12-31 $2,453,786,280 16,046,209
2024-09-30 $3,162,514,913 16,315,079
2024-06-30 $3,787,543,315 16,338,294
2024-03-31 $3,497,672,991 16,220,716
2023-12-31 $4,208,759,748 16,264,481
2023-09-30 $4,115,389,587 16,012,566
2023-06-30 $4,564,970,778 16,025,876
2023-03-31 $4,448,804,182 16,001,166
2022-12-31 $4,347,803,505 15,700,576
2022-09-30 $4,203,037,905 15,741,715
2022-06-30 $3,207,267,712 15,726,526
2022-03-31 $3,334,768,023 15,834,606
2021-12-31 $3,780,516,607 15,757,405
2021-09-30 $4,601,110,355 16,258,915
2021-06-30 $5,699,086,872 16,458,506
2021-03-31 $4,688,122,116 16,758,256
2020-12-31 $3,874,191,080 15,822,066
2020-09-30 $4,452,840,990 15,696,704
2020-06-30 $4,182,323,406 15,631,932
2020-03-31 $5,051,319,599 15,965,989