Institutional shares held 131 Million
2.73M calls
2.47M puts
Total value of holdings $16.9B
$352M calls
$318M puts
Market Cap $18.6B
144,000,992 Shares Out.
Institutional ownership 91.06%
# of Institutions 1,015


Latest Institutional Activity in BIIB

Top Purchases

Q2 2025
Point72 Asset Management, L.P. Shares Held: 3.83M ($494M)
Q2 2025
Norges Bank Shares Held: 2.26M ($292M)
Q2 2025
Brinker Capital Investments, LLC Shares Held: 517K ($66.7M)
Q2 2025
Alyeska Investment Group, L.P. Shares Held: 509K ($65.6M)
Q2 2025
Arrowstreet Capital, Limited Partnership Shares Held: 624K ($80.5M)

Top Sells

Q2 2025
T. Rowe Price Investment Management, Inc. Shares Held: 1.39M ($180M)
Q2 2025
Amundi Shares Held: 580K ($74.8M)
Q2 2025
Sg Americas Securities, LLC Shares Held: 22.5K ($2.9M)
Q2 2025
Qube Research & Technologies LTD Shares Held: 743K ($95.8M)
Q2 2025
Squarepoint Ops LLC Shares Held: 37.2K ($4.79M)

About BIIB

Biogen Inc. discovers, develops, manufactures, and delivers therapies for treating neurological and neurodegenerative diseases. The company offers TECFIDERA, VUMERITY, AVONEX, PLEGRIDY, TYSABRI, and FAMPYRA for multiple sclerosis (MS); SPINRAZA for spinal muscular atrophy; and FUMADERM to treat plaque psoriasis. It also provides BENEPALI, an etanercept biosimilar referencing ENBREL; ADUHELM for the treatment of Alzheimer's disease; IMRALDI, an adalimumab biosimilar referencing HUMIRA; and FLIXABI, an infliximab biosimilar referencing REMICADE. In addition, the company offers RITUXAN for treating non-Hodgkin's lymphoma, chronic lymphocytic leukemia (CLL), rheumatoid arthritis, two forms of ANCA-associated vasculitis, and pemphigus vulgaris; RITUXAN HYCELA for non-Hodgkin's lymphoma and CLL; GAZYVA to treat CLL and follicular lymphoma; and OCREVUS for treating relapsing MS and primary progressive MS; and other anti-CD20 therapies. Further, it develops BIIB135, BIIB061, BIIB091, and BIIB107 for MS and neuroimmunology; Aducanumab, Lecanemab, BIIB076, and BIIB080 to treat Alzheimer's disease and dementia; BIIB067, BIIB078, BIIB105, BIIB100, and BIIB110 to treat neuromuscular disorders; BIIB124, BIIB094, BIIB118, BIIB101, and BIIB122 for treating Parkinson's disease and movement disorders; BIIB125 and BIIB104 for treating neuropsychiatry; Dapirolizumab pegol and BIIB059 to treat immunology related diseases; BIIB093 and BIIB131 to treat acute neurology; BIIB074 for neuropathic pain; and BYOOVIZ, BIIB800, and SB15 biosimilars, which are under various stages of development. The company has collaboration and license agreements with Acorda Therapeutics, Inc.; Alkermes Pharma Ireland Limited; Denali Therapeutics Inc.; Eisai Co., Ltd.; Genentech, Inc.; Neurimmune SubOne AG; Ionis Pharmaceuticals, Inc.; Samsung Bioepis Co., Ltd.; Sangamo Therapeutics, Inc.; and Sage Therapeutics, Inc. Biogen Inc. was founded in 1978 and is headquartered in Cambridge, Massachusetts.


Insider Transactions at BIIB

Insider Transaction List

View all
Date Insider Transaction Ownership Type Shares Traded Value / Price
View All Transactions

Last 12 Months Summary

Buy / Acquisition
99.1K Shares
From 21 Insiders
Grant, award, or other acquisition 22.1K shares
Exercise of conversion of derivative security 55.6K shares
Open market or private purchase 1.24K shares
Bona fide gift 20.1K shares
Sell / Disposition
53.9K Shares
From 14 Insiders
Payment of exercise price or tax liability 18.5K shares
Open market or private sale 15.3K shares
Bona fide gift 20.1K shares

Track Institutional and Insider Activities on BIIB

Follow BIOGEN INC. and customize your updates to receive the information that matters most to you.

Institutional Portfolio Updates

Receive a notification when an Institution or Guru buys or sells BIIB shares.

Notify only if

Insider Trading

Get notified when an Biogen Inc. insider buys or sells BIIB shares.

Notify only if

News

Receive news related to BIOGEN INC.

Track Activities on BIIB