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Overview
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Business Summary
Filings
Ownership
Valuation
Ownership — BIIB
Institutional Holdings
Insider Transactions
US Institutional Ownership
98.0%
Institution
Shares
Value
Ownership %
Change
Filing Date
FMR LLC
18.22M
$3.94B
12.38%
+5.41M
2026-06-30
BlackRock, Inc.
15.99M
$3.45B
10.86%
+11.1K
2026-06-30
PRIMECAP MANAGEMENT CO/CA/
15.15M
$3.27B
10.30%
+397.0K
2026-06-30
VANGUARD CAPITAL MANAGEMENT LLC
9.65M
$2.08B
6.56%
+113.7K
2026-06-30
STATE STREET CORP
7.34M
$1.59B
4.99%
+176.4K
2026-06-30
VANGUARD PORTFOLIO MANAGEMENT LLC
6.60M
$1.43B
4.49%
+73.2K
2026-06-30
GEODE CAPITAL MANAGEMENT, LLC
4.45M
$957.0M
3.02%
+106.7K
2026-06-30
WELLINGTON MANAGEMENT GROUP LLP
3.12M
$673.0M
2.12%
+155.8K
2026-06-30
NORGES BANK
2.58M
$557.0M
1.75%
-58.8K
2026-06-30
MORGAN STANLEY
2.41M
$520.0M
1.64%
+240.3K
2026-06-30
AQR CAPITAL MANAGEMENT LLC
1.94M
$416.0M
1.32%
+13.3K
2026-06-30
JPMORGAN CHASE & CO
1.82M
$394.0M
1.24%
-34.1K
2026-06-30
Invesco Ltd.
1.80M
$389.0M
1.23%
+58.7K
2026-06-30
UBS Group AG
1.53M
$331.0M
1.04%
+1.01M
2026-06-30
Amundi
1.52M
$327.0M
1.03%
+726.0K
2026-06-30
Legal & General Group Plc
1.49M
$322.0M
1.01%
+143.5K
2026-06-30
NORTHERN TRUST CORP
1.43M
$308.0M
0.97%
-17.1K
2026-06-30
GOLDMAN SACHS GROUP INC
1.27M
$274.0M
0.86%
+92.9K
2026-06-30
Boston Partners
1.26M
$272.0M
0.86%
-436.6K
2026-06-30
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC
1.26M
$271.0M
0.85%
-122.4K
2026-06-30
DIMENSIONAL FUND ADVISORS LP
1.15M
$248.0M
0.78%
+69.4K
2026-06-30
Pacer Advisors, Inc.
1.12M
$242.0M
0.76%
--
2026-06-30
Sixth Street Partners Management Company, L.P.
1.12M
$241.0M
0.76%
--
2026-06-30
CHARLES SCHWAB INVESTMENT MANAGEMENT INC
1.12M
$241.0M
0.76%
-31.7K
2026-06-30
BANK OF AMERICA CORP /DE/
1.12M
$241.0M
0.76%
-40.1K
2026-06-30
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