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Business Summary
Filings
Ownership
Valuation
Ownership — BIIB
Institutional Holdings
Insider Transactions
US Institutional Ownership
88.9%
Institution
Shares
Value
Ownership %
Change
Filing Date
BlackRock, Inc.
15.97M
$2.93B
10.85%
+1.16M
2026-03-31
PRIMECAP MANAGEMENT CO/CA/
14.76M
$2.71B
10.03%
-390
2026-03-31
FMR LLC
12.81M
$2.35B
8.70%
+3.38M
2026-03-31
VANGUARD CAPITAL MANAGEMENT LLC
9.54M
$1.75B
6.48%
--
2026-03-31
STATE STREET CORP
7.17M
$1.31B
4.87%
+8.9K
2026-03-31
VANGUARD PORTFOLIO MANAGEMENT LLC
6.53M
$1.20B
4.44%
--
2026-03-31
GEODE CAPITAL MANAGEMENT, LLC
4.34M
$793.0M
2.95%
+143.2K
2026-03-31
WELLINGTON MANAGEMENT GROUP LLP
2.96M
$542.0M
2.01%
-589.6K
2026-03-31
MORGAN STANLEY
2.17M
$397.0M
1.47%
-154.1K
2026-03-31
AQR CAPITAL MANAGEMENT LLC
1.92M
$346.0M
1.31%
+394.9K
2026-03-31
Invesco Ltd.
1.75M
$319.0M
1.19%
+89.8K
2026-03-31
Boston Partners
1.70M
$311.0M
1.15%
-20.5K
2026-03-31
NORTHERN TRUST CORP
1.45M
$265.0M
0.98%
+453
2026-03-31
UBS AM, A DISTINCT BUSINESS UNIT OF UBS ASSET MANAGEMENT AMERICAS LLC
1.38M
$252.0M
0.94%
-13.8K
2026-03-31
Legal & General Group Plc
1.35M
$247.0M
0.92%
-109.8K
2026-03-31
GOLDMAN SACHS GROUP INC
1.18M
$215.0M
0.80%
+20.3K
2026-03-31
T. Rowe Price Investment Management, Inc.
1.16M
$212.0M
0.79%
+382.5K
2026-03-31
BANK OF AMERICA CORP /DE/
1.16M
$211.0M
0.79%
+27.5K
2026-03-31
CHARLES SCHWAB INVESTMENT MANAGEMENT INC
1.15M
$210.0M
0.78%
+5.5K
2026-03-31
VAN ECK ASSOCIATES CORP
1.08M
$197.0M
0.73%
+14.2K
2026-03-31
DIMENSIONAL FUND ADVISORS LP
1.08M
$197.0M
0.73%
+118.5K
2026-03-31
DEUTSCHE BANK AG\
1.06M
$195.0M
0.72%
+110.1K
2026-03-31
Pictet Asset Management Holding SA
913.3K
$168.0M
0.62%
-34.2K
2026-03-31
VANGUARD FIDUCIARY TRUST CO
825.5K
$151.0M
0.56%
--
2026-03-31
Point72 Asset Management, L.P.
814.3K
$149.0M
0.55%
-3.00M
2026-03-31
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