Biogen Inc (BIIB) Ownership

175.84 ↑0.00 (0.00%)
As of December 31, 1969, 7:00pm EST.

Institutional Ownership

Vanguard Group Inc is the biggest individual institutional holder of Biogen Inc (BIIB), owning a total of 17.3 million shares. Combined, the top 38 institutional holders of BIIB own 79.45% of the company with a total of 116.3 million shares.

In the latest ownership report on June 30th 2025, the top 38 institutional holders increased their combined ownership of BIIB by 1.6 million shares. 12 institutions bought 5,041,128 total additional shares and increased their ownership by an average of 77.80%. However 8 institutions sold 3,413,972 total shares and decreased their ownership by an average of 10.03%.

Overall this is a positive sign as the number of shares owned by the top 20 institutional holders of Biogen increased by a net total of 1,627,156 in the latest quarter.

Institution Ownership Chart

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Latest Institutional Ownership Changes

OwnerPercent OwnedPercent ChangeShares OwnedShare ChangeDate Reported
Vanguard Group Inc11.793%1.514%17,290,651257,8122025-06-30
PRIMECAP Management Company10.778%-0.885%15,802,122-141,1372025-06-30
BlackRock Inc9.246%-10.884%13,555,466-1,655,5702025-06-30
State Street Corp5.094%0.972%7,468,80771,8972025-06-30
Wellington Management Company LLP3.273%2.696%4,798,420125,9832025-06-30
Geode Capital Management, LLC2.672%1.853%3,918,15071,2862025-06-30
Point72 Asset Management, L.P.2.614%840.862%3,831,7273,424,4702025-06-30
Amvescap Plc.1.583%2.434%2,320,12655,1192025-06-30
NORGES BANK1.544%-2.624%2,264,177-61,0222025-06-30
Morgan Stanley - Brokerage Accounts1.334%-1.731%1,956,210-34,4582025-06-30
UBS Asset Mgmt Americas Inc1.189%15.415%1,743,209232,8232025-06-30
FMR Inc1.142%27.918%1,674,220365,3922025-06-30
Northern Trust Corp1.048%2.391%1,536,98035,8932025-06-30
Legal & General Group PLC0.987%12.590%1,446,816161,7892025-06-30
T. Rowe Price Investment Management,Inc.0.951%-47.582%1,394,476-1,265,8142025-06-30
D. E. Shaw & Co LP0.932%-13.835%1,366,207-219,3652025-06-30
AQR Capital Management LLC0.931%-0.295%1,364,805-4,0372025-06-30
Pacer Advisors, INC.0.900%-2.408%1,319,991-32,5692025-06-30
Deutsche Bank AG0.766%19.353%1,123,178182,1262025-06-30
Charles Schwab Investment Management Inc0.734%5.547%1,075,75756,5382025-06-30

Top Institutions

OwnerPercent OwnedPercent ChangeShares OwnedShare ChangeDate Reported
Vanguard Group Inc11.793%1.514%17,290,651257,8122025-06-30
PRIMECAP Management Company10.778%-0.885%15,802,122-141,1372025-06-30
BlackRock Inc9.246%-10.884%13,555,466-1,655,5702025-06-30
State Street Corp5.094%0.972%7,468,80771,8972025-06-30
State Street Corporation4.632%-2.860%6,747,008-198,6572024-03-31
Wellington Management Company LLP3.273%2.696%4,798,420125,9832025-06-30
Geode Capital Management, LLC2.672%1.853%3,918,15071,2862025-06-30
Point72 Asset Management, L.P.2.614%840.862%3,831,7273,424,4702025-06-30
Envestnet Asset Management Inc1.765%771.177%2,556,5832,263,1202023-03-31
Amvescap Plc.1.583%2.434%2,320,12655,1192025-06-30
NORGES BANK1.544%-2.624%2,264,177-61,0222025-06-30
Morgan Stanley - Brokerage Accounts1.334%-1.731%1,956,210-34,4582025-06-30
Beutel, Goodman & Company Ltd.1.192%0.133%1,746,4772,3232024-12-31
UBS Asset Mgmt Americas Inc1.189%15.415%1,743,209232,8232025-06-30
FMR Inc1.142%27.918%1,674,220365,3922025-06-30
Northern Trust Corp1.048%2.391%1,536,98035,8932025-06-30
ClearBridge Advisors, LLC1.008%-5.945%1,468,822-92,8382024-06-30
JPMorgan Chase & Co0.998%-30.177%1,463,720-632,5942025-03-31
Legal & General Group PLC0.987%12.590%1,446,816161,7892025-06-30
Goldman Sachs Group Inc0.975%42.891%1,420,860426,4952024-06-30
T. Rowe Price Investment Management,Inc.0.951%-47.582%1,394,476-1,265,8142025-06-30
D. E. Shaw & Co LP0.932%-13.835%1,366,207-219,3652025-06-30
AQR Capital Management LLC0.931%-0.295%1,364,805-4,0372025-06-30
Pacer Advisors, INC.0.900%-2.408%1,319,991-32,5692025-06-30
Amundi0.898%8.131%1,315,94798,9572025-03-31
Marshall Wace Asset Management Ltd0.860%726.271%1,244,1501,093,5762022-12-31
Qube Research & Technologies0.837%12.455%1,226,709135,8672025-03-31
Renaissance Technologies Corp0.814%25.139%1,192,206239,5002024-12-31
RA Capital Management, LLC0.813%20.600%1,184,456202,3172024-09-30
T. Rowe Price Associates, Inc.0.785%-40.467%1,151,192-782,5242025-03-31
Ameriprise Financial Inc0.790%-20.656%1,150,486-299,5192024-09-30
Deutsche Bank AG0.766%19.353%1,123,178182,1262025-06-30
Dimensional Fund Advisors, Inc.0.765%0.381%1,114,3404,2282024-09-30
Charles Schwab Investment Management Inc0.734%5.547%1,075,75756,5382025-06-30
Van Eck Associates Corporation0.732%977.918%1,066,460967,5232024-12-31
Pictet Asset Manangement SA0.696%-19.371%1,014,278-243,6812024-03-31
Bank of New York Mellon Corp0.688%-19.596%1,003,135-244,4802024-09-30
Two Sigma Advisers, LLC0.691%-9.334%995,600-102,5002022-06-30

Mutual Fund Ownership

Vanguard PRIMECAP Inv is the biggest individual fund holder of Biogen Inc (BIIB), owning a total of 9 million shares. Combined, the top 38 mutual fund holders of BIIB own 53.22% of the company with a total of 77.8 million shares.

In the latest ownership report on August 31st 2025, the top 38 fund holders increased their combined ownership of BIIB by 24 thousand shares. 3 funds bought 25,347 total additional shares and increased their ownership by an average of 0.55%. However 1 funds sold 1,233 total shares and decreased their ownership by an average of 0.16%.

Overall this is a positive sign as the number of shares owned by the top 20 mutual funds holding Biogen increased by a net total of 24,114 in the latest report.

Mutual Funds Chart

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Latest Mutual Fund Ownership Changes

OwnerPercent OwnedPercent ChangeShares OwnedShare ChangeDate Reported
iShares Core S&P 500 ETF1.202%0.000%1,762,60702025-08-31
SPDR® S&P 500® ETF1.202%1.250%1,761,90521,7582025-08-31
The Health Care Select Sector SPDR® ETF0.682%0.163%1,000,4981,6242025-08-31
SPDR® S&P Biotech ETF0.601%0.223%881,5991,9652025-08-31
iShares Biotechnology ETF0.595%0.000%872,46702025-08-31
State St S&P 500® Indx SL Cl III0.533%-0.157%782,111-1,2332025-08-31

Top Mutual Funds

OwnerPercent OwnedPercent ChangeShares OwnedShare ChangeDate Reported
Vanguard PRIMECAP Inv6.141%-0.061%9,003,901-5,4602025-06-30
Vanguard US Total Market Shares ETF3.155%0.075%4,618,7643,4612024-09-30
Vanguard Total Stock Mkt Idx Inv3.146%-2.212%4,612,908-104,3332025-07-31
Vanguard Instl Ttl Stck Mkt Idx Tr3.088%2.099%4,471,66191,9492023-03-31
Vanguard Health Care Inv2.979%0.000%4,367,08502025-06-30
Vanguard Institutional 500 Index Trust2.842%0.737%4,164,72830,4782025-05-31
Vanguard 500 Index Investor2.475%-12.773%3,627,985-531,2482025-07-31
Vanguard Mid Cap Index Institutional2.229%1.088%3,268,65235,1902025-07-31
Invesco QQQ Trust2.060%0.700%3,020,17921,0042025-08-29
Vanguard Capital Opportunity Inv1.639%2.446%2,403,05757,3802025-06-30
Fidelity 500 Index1.267%0.043%1,857,3787922025-07-31
SPDR® S&P 500 ETF1.239%-1.449%1,813,763-26,6602025-03-31
SPDR® S&P 500® ETF Trust1.206%-0.523%1,765,517-9,2882025-03-31
iShares Core S&P 500 ETF1.202%0.000%1,762,60702025-08-31
SPDR® S&P 500® ETF1.202%1.250%1,761,90521,7582025-08-31
SPDR® S&P 500 ETF Trust1.188%0.701%1,730,32512,0402024-05-30
Fidelity® 500 Index1.165%0.641%1,687,59510,7402023-11-30
VanEck Morningstar Wide Moat ETF1.072%-0.030%1,560,615-4622024-05-31
VanEck Morningstar Wide Moat1.066%24.335%1,552,650303,8862024-03-31
Vanguard PRIMECAP Core Inv0.937%-0.665%1,373,756-9,1902025-06-30
Vanguard Value Index Inv0.886%-0.132%1,298,740-1,7132025-07-31
T. Rowe Price Capital Appreciation0.877%23.415%1,277,623242,4002024-10-31
T. Rowe Price Mid-Cap Growth0.785%-13.845%1,150,000-184,8002025-03-31
T. Rowe Price US Mid-Cap Growth Equity0.785%-10.908%1,150,000-140,8002025-03-31
Pacer US Cash Cows 100 ETF0.769%-0.216%1,127,371-2,4452025-08-29
Invesco S&P 500® Equal Weight ETF0.725%0.148%1,063,2941,5662025-08-29
Health Care Select Sector SPDR® ETF0.722%-0.223%1,050,678-2,3522024-05-30
The Health Care Select Sector SPDR® ETF0.682%0.163%1,000,4981,6242025-08-31
Vanguard Mid-Cap Value ETF0.629%-0.060%921,913-5522025-07-31
JPMorgan US Equity L0.615%1.504%890,76413,1942023-11-30
Vanguard Institutional Index I0.604%-1.090%884,750-9,7492025-07-31
SPDR® S&P Biotech ETF0.601%0.223%881,5991,9652025-08-31
iShares Biotechnology ETF0.595%0.000%872,46702025-08-31
PRIMECAP Odyssey Aggressive Growth0.578%-0.783%846,580-6,6792025-03-31
PRIMECAP Odyssey Growth0.553%0.628%801,3505,0002023-06-30
State St S&P 500® Indx SL Cl III0.533%-0.157%782,111-1,2332025-08-31
BGF World Healthscience A20.522%0.000%752,03302022-08-31
Fidelity® Select Biotechnology0.456%-6.529%657,136-45,9002022-12-31

Discussions

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LongUsername10/18/25 04:10pm

$BIIB i come here all weekend... every weekend. refresh refresh refresh. smh

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