Biogen Inc. (BIIB) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

147,100,000Shares Outstanding

141,545,222Shares held by institutions

$26,320,334,031Value of institutional holdings

96.22%Institutional ownership %

5.29%Shares Changed QoQ

968No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

Biogen Inc. (NASDAQ:BIIB) has 967 institutional investors that have filed 13F reports for the period ending 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.
During the quarter, 492 of these 967 funds increased positions in BIIB, 294 reduced exposure, and 181 held steady.
Institutional investors collectively 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.
As of December 31, 2025, the biggest holder of Biogen is First County Bank /CT/ at 4.17K shares, representing 0.0% of shares outstanding.
Leading buyers of Biogen shares for the quarter ending December 2025 were Ares Financial Consulting, LLC (98).
Leading sellers of Biogen shares for the quarter ending December 2025 were First County Bank /CT/ (246).
Biogen's 5 largest shareholders as of December 2025 include First County Bank /CT/ (4.17K), Investors Research Corp (1.85K), Ares Financial Consulting, LLC (123), ADIRONDACK TRUST CO (80), Bangor Savings Bank (28) per Business Quant data.

968 Institutional Holders

141,545,222 Total Shares Held

Rows:

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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
Goldman Sachs Group Inc	31 Dec, 2025	2,198,464	1,134,878	106.70%	$386,907,632.00
T. Rowe Price Investment Management, Inc.	31 Dec, 2025	1,949,368	881,886	82.61%	$343,070.00
Jpmorgan Chase & Co	31 Dec, 2025	1,857,262	-679,438	-26.78%	$326,859,629.00
Boston Partners	31 Dec, 2025	1,720,595	1,720,595	0.00%	$302,815,433.00
Invesco Ltd.	31 Dec, 2025	1,655,441	-762,686	-31.54%	$291,341,046.00
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	-2,335,097	-64.15%	$229,668,181.00

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