Biogen Inc. (BIIB) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

147,160,883Shares Outstanding

301,870Shares held by institutions

$57,050,411Value of institutional holdings

18.03%Institutional ownership %

3.03%Shares Changed QoQ

402No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

According to SEC filings for the period ending December 2025, Biogen Inc. (NASDAQ:BIIB) is held by 402 institutional firms.

Biogen saw its institutional ownership percentage fell to 18.0% in December 2025 from 89.6% in September 2025.
On a quarter-over-quarter basis, institutional holdings shifted by 3.03%, with a year-over-year a decrease of 53.15% in the count of filers.
Of these 402 institutional investors, 196 increased their holdings in Biogen, while 105 of them reduced positions, and 101 investors maintained their exposure.
This class of investors increased its holdings in Biogen to 26.54Mn shares for the 13F-cycle ending December 2025, up by 779.51K shares quarter on quarter, and down 105.39Mn shares year over year.
VANGUARD GROUP INC continues to be the largest institutional holder of Biogen as of December 31, 2025, with a position of 17.45Mn shares, representing 11.86% of the company's outstanding stock.
Among the most significant buyers of Biogen during December 2025 were Artemis Investment Management LLP (226.84K), Pictet Asset Management Holding SA (176.64K), SG Americas Securities, LLC (174.12K), VANGUARD GROUP INC (157.86K), UBS Group AG (128.02K).
Leading sellers of Biogen stock in December 2025 included AustralianSuper Pty Ltd (274.57K), NORDEA INVESTMENT MANAGEMENT AB (118.56K), THRIVENT FINANCIAL FOR LUTHERANS (68.10K), Robeco Institutional Asset Management B.V. (60.15K), Sumitomo Mitsui Trust Group, Inc. (44.98K).
The top 10 institutional holders of Biogen for the quarter ending December 2025 included VANGUARD GROUP INC (17.45Mn), Pictet Asset Management Holding SA (947.49K), UBS Group AG (766.99K), MASSACHUSETTS FINANCIAL SERVICES CO /MA/ (712.56K), Robeco Institutional Asset Management B.V. (610.91K), AustralianSuper Pty Ltd (476.81K), Zurcher Kantonalbank (Zurich Cantonalbank) (452.44K), Sumitomo Mitsui Trust Group, Inc. (370.63K), Mitsubishi UFJ Asset Management Co., Ltd. (319.91K), AEGON ASSET MANAGEMENT UK PLC (260.16K).

893 Institutional Holders

301,870 Total Shares Held

Rows:

Download Data

Owner Name	Date	Shares Held	Change (QoQ)	Change (%)	Value (USD)
VANGUARD GROUP INC	30 Sep, 2025	17,289,235	-1,416	-0.01%	$2,421,876,038.00
PRIMECAP MANAGEMENT CO/CA/	30 Sep, 2025	14,954,697	-847,425	-5.36%	$2,094,853,953.00
BlackRock, Inc.	30 Sep, 2025	14,763,952	1,208,486	8.92%	$2,068,134,447.00
STATE STREET CORP	30 Sep, 2025	7,319,749	-149,058	-2.00%	$1,025,350,440.00
WELLINGTON MANAGEMENT GROUP LLP	30 Sep, 2025	4,246,504	-551,916	-11.50%	$594,850,279.00
GEODE CAPITAL MANAGEMENT, LLC	30 Sep, 2025	4,068,781	150,631	3.84%	$567,740,241.00
Point72 Asset Management, L.P.	30 Sep, 2025	3,872,901	41,174	1.07%	$542,516,040.00
Invesco Ltd.	30 Sep, 2025	2,418,127	98,001	4.22%	$338,731,160.00
MORGAN STANLEY	30 Sep, 2025	2,251,535	295,325	15.10%	$315,395,300.00
AQR CAPITAL MANAGEMENT LLC	30 Sep, 2025	1,783,581	418,776	30.68%	$248,809,475.00
Legal & General Group Plc	30 Sep, 2025	1,593,399	146,583	10.13%	$223,203,335.00
NORTHERN TRUST CORP	30 Sep, 2025	1,499,332	-37,648	-2.45%	$210,026,427.00
MILLENNIUM MANAGEMENT LLC	30 Sep, 2025	1,457,790	703,288	93.21%	$204,207,223.00
Pacer Advisors, Inc.	30 Sep, 2025	1,451,249	131,258	9.94%	$203,290,960.00
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC	30 Sep, 2025	1,439,208	-304,001	-17.44%	$201,604,257.00
BARCLAYS PLC	30 Sep, 2025	1,359,424	561,769	70.43%	$190,428,112.00
FMR LLC	30 Sep, 2025	1,287,760	-386,460	-23.08%	$180,389,352.00
JPMORGAN CHASE & CO	30 Sep, 2025	1,268,350	265,848	26.52%	$177,670,522.00
BALYASNY ASSET MANAGEMENT L.P.	30 Sep, 2025	1,234,149	402,244	48.35%	$172,879,592.00
DEUTSCHE BANK AG\	30 Sep, 2025	1,231,302	108,124	9.63%	$172,480,783.00

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Biogen Inc. (BIIB) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

893 Institutional Holders

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