Biogen Inc. (BIIB) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

0Shares Outstanding

520,424Shares held by institutions

$97,563,887Value of institutional holdings

88.90%Institutional ownership %

1.61%Shares Changed QoQ

854No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

Biogen Inc. (NASDAQ:BIIB) is held by 967 institutional investors per 13F filings through December 2025.

These investors collectively held 95.1% of Biogen's outstanding shares in December 2025, up from 91.3% in September 2025.
They increased total shares held in Biogen by 6.46% from last quarter, and the number of investors in BIIB increased 12.7% annually.
Of these 967 funds, 492 grew their exposure to Biogen, 294 cut back, and 181 maintained positions.
In total, institutional investors held 139.93Mn shares in Biogen as of December 2025, up by 8.49Mn shares quarter on quarter, and up 3.87Mn shares year over year.
VANGUARD GROUP INC leads ownership in BIIB with 17.45Mn shares as of December 31, 2025, equal to 11.86% of outstanding shares.
Top purchasers of BIIB stock for the quarter ending December 2025 included FMR LLC (8.14Mn), NORGES BANK (2.64Mn), Boston Partners (1.72Mn), T. Rowe Price Investment Management, Inc. (881.89K), FRED ALGER MANAGEMENT, LLC (796.74K).
The largest sales of BIIB for the quarter ending December 2025 came from Bank Of America Corp /De/ (1.31Mn), Point72 Asset Management, L.P. (1.06Mn), AustralianSuper Pty Ltd (1.03Mn), Invesco Ltd. (762.69K), WELLINGTON MANAGEMENT GROUP LLP (695.24K).
Business Quant data shows the 10 biggest positions in Biogen as of December 2025 are held by VANGUARD GROUP INC (17.45Mn), BlackRock, Inc. (14.81Mn), PRIMECAP MANAGEMENT CO/CA/ (14.76Mn), FMR LLC (9.43Mn), State Street Corp (7.16Mn), GEODE CAPITAL MANAGEMENT, LLC (4.2Mn), WELLINGTON MANAGEMENT GROUP LLP (3.55Mn), Point72 Asset Management, L.P. (2.81Mn), NORGES BANK (2.64Mn), Morgan Stanley (2.33Mn).

967 Institutional Holders

520,424 Total Shares Held

Rows:

Download Data

Owner Name	Date	Change (QoQ)	Change (%)	Value (USD)
BlackRock, Inc.	31 Dec, 2025	47,418	0.32%	$0.00
VANGUARD GROUP INC	31 Dec, 2025	157,857	0.91%	$0.00
Point72 Asset Management, L.P.	31 Dec, 2025	-1,059,709	-27.36%	$0.00
Barclays Plc	31 Dec, 2025	-975,673	-42.78%	$0.00
PRIMECAP MANAGEMENT CO/CA/	31 Dec, 2025	-196,700	-1.32%	$0.00
T. Rowe Price Investment Management, Inc.	31 Dec, 2025	881,886	82.61%	$0.00
HSBC HOLDINGS PLC	31 Dec, 2025	560,146	125.17%	$0.00
FMR LLC	31 Dec, 2025	8,138,103	631.96%	$0.00
Pacer Advisors, Inc.	31 Dec, 2025	-305,359	-21.04%	$0.00
Employees Provident Fund Board	31 Dec, 2025	0	0.00%	$0.00
State Street Corp	31 Dec, 2025	-160,729	-2.20%	$0.00
Pictet Asset Management Holding SA	31 Dec, 2025	176,639	22.91%	$0.00
World Investment Advisors	31 Dec, 2025	7,056	109.87%	$0.00
GEODE CAPITAL MANAGEMENT, LLC	31 Dec, 2025	130,618	3.21%	$0.00
UBS Group AG	31 Dec, 2025	2,823	0.44%	$0.00
Rockefeller Capital Management L.P.	31 Dec, 2025	4,839	93.51%	$0.00
WELLINGTON MANAGEMENT GROUP LLP	31 Dec, 2025	-695,235	-16.37%	$0.00
Patient Capital Management, LLC	31 Dec, 2025	179,703	45.31%	$0.00
NORGES BANK	31 Dec, 2025	2,638,834	0.00%	$0.00
AustralianSuper Pty Ltd	31 Dec, 2025	-1,025,960	-68.27%	$0.00

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