BIOGEN INC

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BIIB·09062X103·US·Common Stock·Healthcare - Drug Manufacturers - General-13D/G

BIIB (BIOGEN INC) is held by 289 institutional investors as of Q2 2026. Largest holders: FMR LLC ($3.9B), BlackRock, Inc. ($3.5B), PRIMECAP MANAGEMENT CO/CA/ ($3.3B). Net institutional sentiment: Mixed.

289

Holders

(25 Elite)

$28.3B

Total Value

59% (291)

Consensus

172 buying - 119 selling

13F: Jun 30, 2026Insider & Congress: Updated regularly

Smart Money Verdict

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Institutional (13F)55

Insider (Form 4)38

Activist (13D/13G)40

Congressional (STOCK Act)84

Holder Quality

57

★★★★★

Elite

53

★★★★

Strong

65

★★★

Solid

23

★★

Below

86

★

Weak

Held by 289 funds

25 elite

Who's Trading

Source dates: Price Aug 28, 2026 · Insiders Jun 11, 2026 · Activists Aug 6, 2026 · Congress none

ActivistFMR LLC12.4%Aug 6, 2026

InsiderPNPangalos Menelas NVest 2K shJun 9, 2026

InsiderFCFreire Maria CVest 2K shJun 9, 2026

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Top Holders

Top Holders (289)History

AllNewIncreasedHeldDecreasedExited

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Fund	Action	Shares	Value	Weight	Est. P&L	Conviction
FMR LLC	Increased	18.2M(+42.2%)	$3.9B	0.2%	+16.95%	51
BlackRock, Inc.	Increased	16M(+0.1%)	$3.5B	0.1%	+41.63%	32
PRIMECAP MANAGEMENT CO/CA/	Increased	15.2M(+2.7%)	$3.3B	1.9%	-26.08%	52
VAVANGUARD CAPITAL MANAGEMENT LLC	Increased	9.7M(+1.2%)	$2.1B	0.0%	+18.93%	32
STATE STREET CORP	Increased	7.3M(+2.5%)	$1.6B	0.0%	-13.41%	33
VPVANGUARD PORTFOLIO MANAGEMENT LLC	Increased	6.6M(+1.1%)	$1.4B	0.1%	+18.95%	32
GEODE CAPITAL MANAGEMENT, LLC	Increased	4.4M(+2.5%)	$957.9M	0.1%	-14.38%	33
WELLINGTON MANAGEMENT GROUP LLP	Increased	3.1M(+5.3%)	$673.6M	0.1%	-18.97%	40
MORGAN STANLEY	Increased	2.4M(+11.1%)	$521M	0.0%	+5.65%	35
AQR CAPITAL MANAGEMENT LLC	Increased	1.9M(+0.7%)	$416.9M	0.1%	+43.10%	37
JPMORGAN CHASE & CO	Decreased	1.8M(-9.6%)	$394.9M	0.0%	+47.48%	0
Invesco Ltd.	Increased	1.8M(+3.4%)	$389.8M	0.0%	+3.94%	32
Amundi	Increased	1.5M(+91.8%)	$327.7M	0.1%	+2.36%	49
Legal & General Group Plc	Increased	1.5M(+10.6%)	$322.6M	0.1%	-12.73%	34
NORTHERN TRUST CORP	Decreased	1.4M(-1.2%)	$308.9M	0.0%	-2.20%	0
Boston Partners	Decreased	1.3M(-25.7%)	$272.8M	0.2%	+24.15%	0
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC	Decreased	1.3M(-8.9%)	$271.2M	0.0%	-4.86%	0
GOLDMAN SACHS GROUP INC	Increased	1.2M(+17.1%)	$265.8M	0.0%	+38.78%	36
DIMENSIONAL FUND ADVISORS LP	Increased	1.1M(+6.4%)	$248.2M	0.0%	-14.53%	33
CHARLES SCHWAB INVESTMENT MANAGEMENT INC	Decreased	1.1M(-2.8%)	$241.5M	0.0%	-14.76%	0

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High Conviction Moves-Smart Money Convergence-Fund Consensus-Double-Down Detection

Data sourced from four public-disclosure sources: SEC 13F, Form 4, 13D/13G, and House/Senate STOCK Act disclosures. Not financial advice. Full disclaimer