Biogen Ownership | Who Owns Biogen?
Biogen Ownership Summary
Biogen is owned by 90.00% institutional investors, 0.18% insiders, and 9.82% retail investors. Vanguard group is the largest institutional shareholder, holding 11.90% of BIIB shares. Vanguard PRIMECAP Inv is the top mutual fund, with 5.66% of its assets in Biogen shares.
BIIB Ownership Benchmark
| Type | Name | % Inst | % Insiders | % Retail |
|---|---|---|---|---|
| Stock | Biogen | 90.00% | 0.18% | 9.82% |
| Sector | Healthcare Stocks | 35.56% | 12.08% | 52.36% |
| Industry | Drug Manufacturers - General Stocks | 45.56% | 5.78% | 48.65% |
Institutional Shareholders
Top Institutional Shareholders by Total Shares
| Holder | Shares | % Holding | Value |
|---|---|---|---|
| Vanguard group | 17.45M | 11.90% | $3.07B |
| Blackrock funding, inc. /de | 15.99M | 10.86% | $3.45B |
| Primecap management co/ca/ | 14.76M | 10.06% | $2.71B |
| Blackrock | 14.54M | 10.01% | $3.37B |
| Fmr | 12.81M | 8.73% | $2.35B |
| State street | 7.34M | 4.99% | $1.59B |
| Geode capital management | 4.34M | 2.96% | $793.39M |
| Wellington management group llp | 2.96M | 2.02% | $542.96M |
| Norges bank | 2.58M | 1.75% | $557.44M |
| Morgan stanley | 2.17M | 1.48% | $398.00M |
Top Institutional Shareholders by % of Total Assets
| Holder | Shares | % Assets | Value |
|---|---|---|---|
| Palo alto investors lp | 140.72K | 3.95% | $25.80M |
| Sector gamma as | 90.10K | 3.90% | $16.52M |
| Hillman capital management | 29.54K | 3.76% | $5.42M |
| Healthinvest partners ab | 62.78K | 3.65% | $13.56M |
| Sphera funds management | 92.53K | 2.69% | $16.96M |
| Patient capital management | 379.74K | 2.55% | $69.62M |
| Orion investment | 39.57K | 2.49% | $8.55M |
| Rhenman & partners asset management ab | 109.10K | 2.47% | $20.00M |
| Old north state wealth management | 24.72K | 2.28% | $5.34M |
| Primecap management co/ca/ | 14.76M | 2.13% | $2.71B |
Top Buyers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Fmr | 12.81M | 0.12% | 3.38M |
| Norges bank | 2.58M | 0.06% | 2.58M |
| Vanguard fiduciary trust | 825.53K | 0.04% | 825.53K |
| Amundi | 1.52M | 0.08% | 726.00K |
| Aqr capital management | 1.92M | 0.16% | 394.94K |
Top Sellers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Point72 asset management | 809.62K | 0.19% | -2.00M |
| Ra capital management | - | - | -1.18M |
| Pacer advisors | - | - | -1.15M |
| Millennium management | 93.96K | 0.01% | -1.03M |
| Barclays | 551.47K | 0.02% | -753.53K |
New Positions
| Holder | Shares | % Assets | Change | Value |
|---|---|---|---|---|
| Norges bank | 2.58M | 0.06% | 2.58M | $557.44M |
| Vanguard fiduciary trust | 825.53K | 0.04% | 825.53K | $151.34M |
| Vanguard global advisers | 343.77K | 0.03% | 343.77K | $63.02M |
| Vestal point capital, lp | 275.00K | 1.74% | 275.00K | $38.52M |
| Vanguard asset management | 249.78K | 0.04% | 249.78K | $45.79M |
Sold Out
| Holder | Change |
|---|---|
| Brown, lisle/cummings | -1.00 |
| Hm payson | -1.00 |
| Palisade asset management | -1.00 |
| Valued wealth advisors | -1.00 |
| Quest 10 wealth builders | -1.00 |
Institutional Ownership Trends
| Date | Holdings | Change % | Shares | Change % | Ownership | Change % | Increased Position | Change % | Decreased Position | Change % |
|---|---|---|---|---|---|---|---|---|---|---|
| Mar 31, 2026 | 1,021 | -2.48% | 132,037,182 | -5.48% | 90 | 0.99% | 515 | 1.58% | 290 | -3.33% |
| Dec 31, 2025 | 624 | -34.52% | 59,972,123 | -54.07% | 40 | 0.51% | 307 | -31.78% | 173 | -34.47% |
| Sep 30, 2025 | 486 | -45.58% | 33,008,698 | -73.12% | 22 | 0.32% | 229 | -46.99% | 121 | -52.36% |
| Jun 30, 2025 | 893 | -2.40% | 129,663,254 | 2.13% | 88 | 1.18% | 434 | -5.45% | 252 | -1.95% |
| Mar 31, 2025 | 905 | -0.77% | 126,690,015 | -3.57% | 86 | 1.07% | 450 | 6.38% | 258 | -18.61% |
Top Mutual Funds Shareholders
| Holder | Shares | % Holding | Change |
|---|---|---|---|
| Vanguard PRIMECAP Inv | 8.36M | 5.66% | - |
| Fidelity Contrafund | 4.99M | 3.38% | 913.88K |
| Vanguard Total Stock Mkt Idx Inv | 4.69M | 3.18% | 16.70K |
| Vanguard Morn Total Stk Mkt Idx Investor | 4.69M | 3.17% | 16.70K |
| Vanguard US Total Market Shares ETF | 4.62M | 3.16% | 3.46K |
| Vanguard Institutional 500 Index Trust | 4.16M | 2.84% | 30.48K |
| Vanguard 500 Index Investor | 3.84M | 2.60% | -5.65K |
| Vanguard Mid Cap Index Institutional | 3.20M | 2.17% | 15.51K |
| Vanguard Morn Mid Cap Index Instl | 3.20M | 2.17% | 15.51K |
| Invesco QQQ Trust | 3.02M | 2.06% | 21.00K |
Recent Insider Transactions
| Date | Name | Role | Activity | Value |
|---|---|---|---|---|
| Aug 03, 2026 | Minor Lloyd | - | Sell | $120.58K |
| Aug 04, 2026 | Minor Lloyd | - | Sell | $119.17K |
| Feb 12, 2026 | Murphy Nicole | Head of Pharm Ops and Tech | Buy | $585.11 |
| Feb 09, 2026 | Singhal Priya | Head of Development | Sell | $531.55K |
| Feb 02, 2026 | Singhal Priya | Head of Development | Sell | $134.12K |
Insider Transactions Trends
| Date | Buy | Sell |
|---|---|---|
| 2026 Q3 | - | 2 |
| 2026 Q2 | - | - |
| 2026 Q1 | 1 | 2 |
| 2025 Q4 | - | - |
| 2025 Q3 | - | 2 |
BIIB Ownership FAQ
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