Question 1

Who owns BIIB?

Accepted Answer

BIOGEN INC (BIIB) is held by 289 institutional investors that disclose positions via SEC 13F filings. The largest disclosed holder is BlackRock, Inc. as of Q1 2026.

Question 2

Are institutions buying or selling BIIB?

Accepted Answer

In Q1 2026, 152 institutions opened or increased positions in BIOGEN INC while 152 reduced or exited — a balanced quarter.

Question 3

What is the Smart Money Verdict on BIIB?

Accepted Answer

HoldingsIntel scores BIOGEN INC across four independent sources (institutional 13F activity, insider trades, activist filings, and congressional trades) — with 4 of the 4 carrying data for BIIB. In Q1 2026, the institutional leg showed balanced flow: 152 buying versus 152 selling.

Question 4

How many hedge funds hold BIIB?

Accepted Answer

289 institutional investors report holding BIOGEN INC (BIIB) as of Q1 2026, based on SEC 13F filings.

Question 5

Is institutional money flowing into BIIB?

Accepted Answer

As of Q1 2026, tracked institutions in BIOGEN INC show 152 buyers versus 152 sellers — balanced flow.

Question 6

Are Congress members and hedge funds both buying BIIB?

Accepted Answer

Yes — in the latest quarter, 5 members of Congress and 152 institutional investors bought BIOGEN INC. HoldingsIntel cross-checks STOCK Act disclosures against 13F filings to surface these overlaps.

Fund	Action	Shares	Value	Weight	Est. P&L	Conviction
BlackRock, Inc.	Increased	16M(+7.8%)	$2.9B	0.1%	+31.15%	34
PRIMECAP MANAGEMENT CO/CA/	Decreased	14.8M	$2.7B	2.1%	-31.69%	0
FMR LLC	Increased	12.8M(+35.9%)	$2.3B	0.1%	+13.89%	50
VAVANGUARD CAPITAL MANAGEMENT LLC	New	9.5M	$1.7B	0.0%	+8.22%	44
STATE STREET CORP	Increased	7.2M(+0.1%)	$1.3B	0.0%	-21.36%	32
VPVANGUARD PORTFOLIO MANAGEMENT LLC	New	6.5M	$1.2B	0.1%	+8.22%	44
GEODE CAPITAL MANAGEMENT, LLC	Increased	4.3M(+3.4%)	$793.4M	0.0%	-20.06%	33
WELLINGTON MANAGEMENT GROUP LLP	Decreased	3M(-16.6%)	$543M	0.1%	-26.90%	0
MORGAN STANLEY	Decreased	2.2M(-6.6%)	$398M	0.0%	-3.24%	0
JPMORGAN CHASE & CO	Increased	2M(+8.6%)	$378.1M	0.0%	+25.27%	34
AQR CAPITAL MANAGEMENT LLC	Increased	1.9M(+25.8%)	$346.2M	0.2%	+30.96%	46
Invesco Ltd.	Increased	1.7M(+5.4%)	$320M	0.0%	-4.81%	33
Boston Partners	Decreased	1.7M(-1.2%)	$311.7M	0.3%	+12.90%	0
NORTHERN TRUST CORP	Increased	1.4M(+0.0%)	$265.2M	0.0%	-10.74%	31
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC	Decreased	1.4M(-1.0%)	$252.5M	0.1%	-11.95%	0
Legal & General Group Plc	Decreased	1.3M(-7.5%)	$247.5M	0.1%	-18.37%	0
BANK OF AMERICA CORP /DE/	Increased	1.2M(+2.4%)	$212M	0.0%	+42.12%	31
CHARLES SCHWAB INVESTMENT MANAGEMENT INC	Increased	1.1M(+0.5%)	$210.7M	0.0%	-20.94%	31
DIMENSIONAL FUND ADVISORS LP	Increased	1.1M(+12.3%)	$197.9M	0.0%	-22.24%	34
$DEUTSCHE BANK AG\$ DEUTSCHE BANK AG\	Increased	1.1M(+11.5%)	$195M	0.1%	+2.15%	34

BIOGEN INC

Smart Money Verdict

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BIOGEN INC

Smart Money Verdict

Who's Trading

Top Holders

Continue exploring

Other Healthcare stocks held by institutions