BIIB
Common Stock

Biogen INC

As of Jun 30, 2026 CUSIP 09062X103
Institutional Holders
1,053
Total Held Value
$30.54B
Total Exact Shares
141.22M
Largest Holder
Fidelity (FMR)
18.22M shares • $3.94B
Reported Holders1,053
Filings dated Jun 30, 2026 unless marked
# Trend (4Q)
1 Fidelity (FMR) $3.94B 0.2% +42.2% 18.22M Jun 30, 2026
2 BlackRock $3.45B 0.1% +0.1% 15.99M Jun 30, 2026
3 Primecap Management $3.27B 1.9% +2.7% 15.15M Jun 30, 2026
4 Vanguard Capital Management $2.09B <0.1% +1.2% 9.65M Jun 30, 2026
5 State Street $1.59B <0.1% +2.5% 7.34M Jun 30, 2026
6 Vanguard Portfolio Management $1.43B 0.1% +1.1% 6.60M Jun 30, 2026
7 Geode Capital Management $957.9M 0.1% +2.5% 4.45M Jun 30, 2026
8 Wellington Management Group $673.6M 0.1% +5.3% 3.12M Jun 30, 2026
9 Norges Bank $557.4M 0.1% — 2.58M — Jun 30, 2026
10 Morgan Stanley $521.0M <0.1% +11.1% 2.41M Jun 30, 2026
11 AQR Capital Management $416.9M 0.1% +0.7% 1.94M Jun 30, 2026
12 JPMorgan Chase $394.9M <0.1% -9.6% 1.82M Jun 30, 2026
13 Invesco $389.8M <0.1% — 1.80M — Jun 30, 2026
14 Amundi $327.7M 0.1% +91.8% 1.52M Jun 30, 2026
15 Legal & General Group $322.6M 0.1% +10.6% 1.49M Jun 30, 2026
16 Northern Trust $308.9M <0.1% -1.2% 1.43M Jun 30, 2026
17 Boston Partners $272.8M 0.2% -25.7% 1.26M Jun 30, 2026
18 UBS Asset Management $271.2M <0.1% -8.9% 1.26M Jun 30, 2026
19 Goldman Sachs Group $265.8M <0.1% +17.1% 1.23M Jun 30, 2026
20 Dimensional Fund Advisors $248.2M <0.1% +6.4% 1.15M Jun 30, 2026
Exited in Latest Filing77
# Fund Prior Value Prior % of Fund Change Prior Shares Trend (4Q) Exit Report
Each exit is an immediately prior-filing position absent from that manager's latest published filing. Prior values are shown for context and are not included in current totals.