Biogen Inc. (BIIB) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

147,087,600Shares Outstanding

680,003Shares held by institutions

$133,022,187Value of institutional holdings

91.85%Institutional ownership %

8.45%Shares Changed QoQ

934No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

A total of 934 institutions have reported a stake in Biogen Inc. (NASDAQ:BIIB) as of December 2025, according to recent 13F filings with the SEC.

These investors collectively held 91.9% of the company's total shares outstanding in December 2025, up from 90.0% in September 2025.
Institutional share ownership changed by 8.45% QoQ, while the number of institutional owners saw an increase of 8.86% YoY.
Among the 934 institutional holders of Biogen, 472 added to their stakes while 283 trimmed their positions and 179 held steady.
Collectively, institutional investors increased their stake in Biogen to 135.10Mn shares as of December 2025, a change that is up by 10.53Mn shares quarter on quarter and up 3.17Mn shares year over year.
VANGUARD GROUP INC's holding of 17.45Mn shares as of December 31, 2025 makes it the primary institutional investor in Biogen, owning 11.86% of the stock.
Among the most significant buyers of Biogen during December 2025 were FMR LLC (8.14Mn), NORGES BANK (2.64Mn), Boston Partners (1.72Mn), FRED ALGER MANAGEMENT, LLC (796.74K), JPMORGAN CHASE & CO (588.91K).
Leading sellers of Biogen stock in December 2025 included Point72 Asset Management, L.P. (1.06Mn), WELLINGTON MANAGEMENT GROUP LLP (695.24K), BALYASNY ASSET MANAGEMENT L.P. (626.20K), Man Group plc (578.74K), RENAISSANCE TECHNOLOGIES LLC (565.21K).
The top 10 institutional holders of Biogen for the quarter ending December 2025 included 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 (4.20Mn), WELLINGTON MANAGEMENT GROUP LLP (3.55Mn), Point72 Asset Management, L.P. (2.81Mn), NORGES BANK (2.64Mn), MORGAN STANLEY (2.33Mn).

934 Institutional Holders

680,003 Total Shares Held

Rows:

Download Data

Owner Name	Date	Shares Held	Change (QoQ)	Change (%)	Value (USD)
VANGUARD GROUP INC	31 Dec, 2025	17,447,092	157,857	0.91%	$3,070,513,721.00
BlackRock, Inc.	31 Dec, 2025	14,811,370	47,418	0.32%	$2,606,652,919.00
PRIMECAP MANAGEMENT CO/CA/	31 Dec, 2025	14,757,997	-196,700	-1.32%	$2,597,259,895.00
FMR LLC	31 Dec, 2025	9,425,863	8,138,103	631.96%	$1,658,857,459.00
STATE STREET CORP	31 Dec, 2025	7,159,020	-160,729	-2.20%	$1,259,915,930.00
GEODE CAPITAL MANAGEMENT, LLC	31 Dec, 2025	4,199,399	130,618	3.21%	$736,434,804.00
WELLINGTON MANAGEMENT GROUP LLP	31 Dec, 2025	3,551,269	-695,235	-16.37%	$624,987,832.00
Point72 Asset Management, L.P.	31 Dec, 2025	2,813,192	-1,059,709	-27.36%	$495,093,660.00
NORGES BANK	31 Dec, 2025	2,638,834	2,638,834	0.00%	$464,408,396.00
MORGAN STANLEY	31 Dec, 2025	2,325,013	73,478	3.26%	$409,179,635.00
JPMORGAN CHASE & CO	31 Dec, 2025	1,857,262	588,912	46.43%	$326,859,629.00
Boston Partners	31 Dec, 2025	1,720,595	1,720,595	0.00%	$302,815,433.00
AQR CAPITAL MANAGEMENT LLC	31 Dec, 2025	1,528,616	-254,965	-14.30%	$269,021,112.00
Legal & General Group Plc	31 Dec, 2025	1,459,597	-133,802	-8.40%	$256,874,480.00
NORTHERN TRUST CORP	31 Dec, 2025	1,446,126	-53,206	-3.55%	$254,503,714.00
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC	31 Dec, 2025	1,391,370	-47,838	-3.32%	$244,867,205.00
BARCLAYS PLC	31 Dec, 2025	1,305,007	-54,417	-4.00%	$229,668,181.00
MILLENNIUM MANAGEMENT LLC	31 Dec, 2025	1,273,386	-184,404	-12.65%	$224,103,202.00
GOLDMAN SACHS GROUP INC	31 Dec, 2025	1,157,198	93,612	8.80%	$203,655,252.00
CHARLES SCHWAB INVESTMENT MANAGEMENT INC	31 Dec, 2025	1,143,902	20,553	1.83%	$201,315,313.00

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