Biogen Ownership | Who Owns Biogen?


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Biogen Ownership Summary


Biogen is owned by 86.71% institutional investors, 0.22% insiders, and 13.07% retail investors. Vanguard group is the largest institutional shareholder, holding 11.50% of BIIB shares. Vanguard PRIMECAP Inv is the top mutual fund, with 6.15% of its assets in Biogen shares.

BIIB Ownership Benchmark


TypeName% Inst% Insiders% Retail
StockBiogen86.71%0.22%13.07%
SectorHealthcare Stocks 278.45%10.60%-189.04%
IndustryDrug Manufacturers - General Stocks37.59%1.26%61.15%

Institutional Shareholders


Top Institutional Shareholders by Total Shares

HolderShares% HoldingValue
Vanguard group16.75M11.50%$2.56B
Primecap management co/ca/16.05M11.01%$2.45B
Blackrock funding, inc. /de15.47M10.62%$2.37B
Blackrock14.54M10.01%$3.37B
State street7.40M5.08%$1.13B
Wellington management group llp4.93M3.38%$754.01M
Geode capital management3.70M2.54%$563.71M
T. rowe price investment management3.10M2.13%$474.02M
Pacer advisors2.67M1.83%$407.92M
Norges bank2.33M1.60%$355.57M

Top Institutional Shareholders by % of Total Assets

HolderShares% AssetsValue
Palo alto investors lp190.15K4.51%$29.08M
Patient capital management413.96K2.92%$63.30M
Hillman capital management43.07K2.44%$6.59M
Rhenman & partners asset management ab123.70K1.94%$18.92M
Orion investment31.72K1.94%$4.85M
Primecap management co/ca/16.05M1.90%$2.45B
Stoneridge investment partners33.80K1.85%$5.17M
Centre asset management51.53K1.80%$7.88M
Provident co of the employees of the hebrew university9.06K1.61%$1.38M
Sector gamma as29.00K1.52%$4.43M

Top Buyers

HolderShares% AssetsChange
Pacer advisors2.67M0.88%2.65M
Norges bank2.33M0.05%2.33M
D. e. shaw1.61M0.18%1.17M
Van eck associates1.07M0.21%967.52K
Qube research1.09M0.22%741.50K

Top Sellers

HolderShares% AssetsChange
Jpmorgan chase2.10M0.02%-3.16M
Ra capital management---1.18M
T. rowe price investment management3.10M0.29%-1.16M
Ameriprise financial144.02K0.01%-1.01M
Orbimed advisors---509.10K

New Positions

HolderShares% AssetsChangeValue
Norges bank2.33M0.05%2.33M$355.57M
Causeway capital management281.70K0.98%281.70K$43.08M
Voloridge investment management151.68K0.08%151.68K$23.19M
Raymond james financial141.97K0.01%141.97K$21.71M
Cubist systematic strategies114.94K0.11%114.94K$17.58M

Sold Out

HolderChange
Activest wealth management-1.00
Hm payson-1.00
Ancora advisors-2.00
Mcclarren financial advisors-2.00
Financial gravity asset management-3.00

Institutional Ownership Trends


DateHoldingsChange %SharesChange %OwnershipChange %Increased PositionChange %Decreased PositionChange %
Mar 31, 2025905-0.77%126,690,015-3.57%861.07%4506.38%258-18.61%
Dec 31, 2024876-8.46%130,920,9053.18%891.18%40114.24%306-20.10%
Sep 30, 2024945-2.68%126,668,218-1.13%861.12%346-16.63%37411.31%
Jun 30, 2024956-3.34%127,999,4770.64%881.15%4074.90%333-8.01%
Mar 31, 2024989-4.54%127,188,969-0.41%871.13%388-8.06%362-1.90%

Top Mutual Funds Shareholders


HolderShares% HoldingChange
Vanguard PRIMECAP Inv9.01M6.15%-86.36K
Vanguard Total Stock Mkt Idx Inv4.70M3.21%2.87K
Vanguard US Total Market Shares ETF4.62M3.16%3.46K
Vanguard Health Care Inv4.37M2.98%-241.27K
Vanguard Institutional 500 Index Trust4.16M2.84%30.48K
Vanguard Mid Cap Index Institutional3.21M2.19%30.47K
Invesco QQQ Trust3.03M2.07%-
Vanguard Capital Opportunity Inv2.35M1.60%-9.00K
Fidelity 500 Index1.84M1.25%2.27K
SPDR® S&P 500 ETF1.81M1.24%-26.66K

Recent Insider Transactions


DateNameRoleActivityValue
May 19, 2025Singhal Priya Head of DevelopmentSell$480.51K
May 02, 2025DORSA CAROLINE-Buy$151.56K
Mar 07, 2025SHERWIN STEPHEN A-Sell$1.31M
Dec 09, 2024Singhal Priya Head of DevelopmentSell$17.29K
Sep 03, 2024Singhal Priya Head of DevelopmentSell$88.02K

Insider Transactions Trends


DateBuySell
2025 Q211
2025 Q1-1
2024 Q4-1
2024 Q3-1
2024 Q2-1

BIIB Ownership FAQ


Who Owns Biogen?

Biogen shareholders are primarily institutional investors at 86.71%, followed by 0.22% insiders and 13.07% retail investors. The average institutional ownership in Biogen's industry, Drug Manufacturers - General Stocks, is 37.59%, which Biogen exceeds.

Who owns the most shares of Biogen?

Biogen’s largest shareholders are Vanguard group (16.75M shares, 11.50%), Primecap management co/ca/ (16.05M shares, 11.01%), and Blackrock funding, inc. /de (15.47M shares, 10.62%). Together, they hold 33.13% of Biogen’s total shares outstanding.

Does Blackrock own Biogen?

Yes, BlackRock owns 10.01% of Biogen, totaling 14.54M shares as of Jun 2024. This represents 0.08% of BlackRock's total assets, with a market value of 3.37B$. In the last quarter, BlackRock increased its holdings by 393.51K shares, a 2.78% change.

Who is Biogen’s biggest shareholder by percentage of total assets invested?

Palo alto investors lp is Biogen’s biggest shareholder by percentage of total assets invested, with 4.51% of its assets in 190.15K Biogen shares, valued at 29.08M$.

Who is the top mutual fund holder of Biogen shares?

Vanguard PRIMECAP Inv is the top mutual fund holder of Biogen shares, with 6.15% of its total shares outstanding invested in 9.01M Biogen shares.

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