BIIB Biogen Inc.

NASDAQ
$222.15

Biogen Inc. (BIIB) Institutional Ownership

What the institutions did with BIIB last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended September 30, 2026.

Managers compared
10
filed both this quarter and last
Managers holding
10
+0 on the quarter
Buyers
4
0 opened new
Sellers
2
0 sold out entirely
Buyer share
66.7%
of managers who traded it
Breadth
+33.3
net buyers, as a share of those trading

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Ownership map

Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.

Cut Unchanged Added Color saturates at ±50%.

Largest holders

Manager Shares % of reported
TOMPKINS FINANCIAL CORP 2.2K 21.0%
Boltwood Capital Management 2.0K 18.9%
CX Institutional 1.7K 16.2%
Versant Capital Management, Inc 1.6K 15.1%
ACIMA PRIVATE WEALTH, LLC 834 7.9%
EASTERN BANK 796 7.6%
MassMutual Private Wealth & Trust, FSB 653 6.2%
Polaris Financial Partners 477 4.5%
GoalVest Advisory LLC 198 1.9%
Rosenberg Matthew Hamilton 35 0.3%
Planning Strategies Inc. 33 0.3%

Largest changes

Manager Action Previous Current Change
Boltwood Capital Management Increased 1.5K 2.0K +493
ACIMA PRIVATE WEALTH, LLC Reduced 916 834 -82
MassMutual Private Wealth & Trust, FSB Reduced 733 653 -80
Versant Capital Management, Inc Increased 1.5K 1.6K +42
CX Institutional Increased 1.7K 1.7K +3
Planning Strategies Inc. Increased 32 33 +1

13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.