Biogen Inc. (BIIB) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

147,100,000Shares Outstanding

141,561,541Shares held by institutions

$27,152,919,179Value of institutional holdings

96.23%Institutional ownership %

5.29%Shares Changed QoQ

970No. 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.

Their combined ownership stood at 95.1% of outstanding shares in December 2025, up from 91.3% in September 2025.
Their total shares held in BIIB increased 6.46% from the prior quarter, while the number of investors in Biogen increased 12.7% year over year.
Activity in BIIB broke down as 492 buyers, 294 sellers, and 181 unchanged among 967 total holders.
Altogether, these fund groups held 139.93Mn shares in BIIB by December 2025, up by 8.49Mn shares quarter on quarter, and up 3.87Mn shares year over year.
Pictet Asset Management Holding SA holds the largest position in BIIB at 913.33K shares as of December 31, 2025, or 0.62% of shares outstanding.
The largest buyers of Biogen for the quarter ending December 2025 were Artemis Investment Management LLP (344.73K), Robeco Institutional Asset Management B.V. (152.27K), WEALTH ENHANCEMENT ADVISORY SERVICES, LLC (62.53K), Adams Diversified Equity Fund, Inc. (56.0K), CONTRAVISORY INVESTMENT MANAGEMENT, INC. (44.68K).
The largest sales of BIIB for the quarter ending December 2025 came from Pictet Asset Management Holding SA (34.17K), BEACON INVESTMENT ADVISORY SERVICES, INC. (13.03K), NorthCrest Asset Manangement, LLC (8.78K), BANQUE PICTET & CIE SA (5.3K), Sivik Global Healthcare LLC (5.0K).
Per Business Quant data, the top 10 holders of Biogen for the quarter ending December 2025 are Pictet Asset Management Holding SA (913.33K), Robeco Institutional Asset Management B.V. (763.17K), Artemis Investment Management LLP (571.57K), AEGON ASSET MANAGEMENT UK PLC (258.74K), SG Americas Securities, LLC (195.67K), Adams Diversified Equity Fund, Inc. (100.3K), BANQUE PICTET & CIE SA (66.06K), WEALTH ENHANCEMENT ADVISORY SERVICES, LLC (62.53K), GATEWAY INVESTMENT ADVISERS LLC (50.92K), Lansforsakringar Fondforvaltning AB (publ) (47.81K).

978 Institutional Holders

141,561,541 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
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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