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BIIB
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Position history for PRIMECAP MANAGEMENT CO/CA/'s holdings in BIOGEN INC

PRIMECAP MANAGEMENT CO/CA/ holds 14.8M shares of BIIB (BIOGEN INC), worth $2.7B as of 2026-Q1. The position was decreased. BIIB represents 2.1% of PRIMECAP MANAGEMENT CO/CA/'s portfolio.

Current Value

$2.7B

Current Shares

14.8M

Total Value Change

-$1.1B

Total Shares Change

-1.6M

Quarter-by-Quarter History
QuarterActionSharesChangeValueWeightPriceConviction
2026-Q1
Latest
Decreased
14.8M
0.0%
$2.7B2.1%$184.02
0
2025-Q4
Decreased
14.8M
-1.3%
$2.6B2.0%$176.40
0
2025-Q3
Decreased
15M
-5.4%
$2.1B1.6%$138.52
0
2025-Q2
Decreased
15.8M
-0.9%
$2B1.6%$126.08
0
2025-Q1
Decreased
15.9M
-0.6%
$2.2B1.8%$138.37
0
2024-Q4
Decreased
16M
-1.6%
$2.5B1.9%$150.19
0
2024-Q3
Decreased
16.3M
-0.1%
$3.2B2.3%$194.67
0
2024-Q2
Increased
16.3M
+0.7%
$3.8B2.7%$231.82
55

Other major holders of BIIB: BlackRock Finance, Inc., VANGUARD GROUP INC

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