Biogen (BIIB)
Develops neurological medicines spanning MS, rare disease, Alzheimer’s, and complement-mediated conditions.
$222.31
vs last close+3.24 (+1.48%)
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13F · 13D/G · Form 4
| Institutions | 97.04% | 143.38M shares | |
|---|---|---|---|
| 1,099 holders · as of Jun 30, 2026 | |||
| Insiders | 0.22% | 321.3K shares | |
| 21 holders · as of Aug 5, 2026 | |||
| Other | 2.74% | 4.06M shares | |
| remainder | |||
147.75M company shares as of Sep 22, 2026 · institutions as of Jun 30, 2026 · holders as of their latest filing
13F, as of Jun 30, 2026
1,099 holders · 143.38M shares · 130 new positions · 553 increased · 301 reduced · 94 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|---|---|---|---|
| FMR LLC | 18.22M | 12.33% | +5.41M | Aug 13, 2026 |
| BlackRock, Inc. | 15.99M | 10.82% | +11.1K | Aug 7, 2026 |
| Primecap Management Co/CA/ | 15.15M | 10.26% | +397.0K | Aug 14, 2026 |
| Vanguard Capital Management LLC | 9.65M | 6.53% | +113.7K | Aug 13, 2026 |
| State Street Corp | 7.34M | 4.97% | +176.4K | Aug 7, 2026 |
| Vanguard Portfolio Management LLC | 6.60M | 4.47% | +73.2K | Aug 13, 2026 |
| Geode Capital Management, LLC | 4.45M | 3.01% | +106.7K | Aug 12, 2026 |
| Wellington Management Group LLP | 3.12M | 2.11% | +155.8K | Aug 14, 2026 |
13D/G · 5% or more, as filed
| Holder | % of class | Shares | Form | Filed |
|---|---|---|---|---|
| FMR LLC | 11.30% | 16.65M | 13G | Jun 5, 2026 |
| Primecap Management Co/CA/ | 10.20% | 14.95M | 13G | Nov 13, 2025 |
| BlackRock, Inc. | 8.50% | 12.51M | 13G | Apr 17, 2025 |
| Vanguard Capital Management | 7.48% | 10.99M | 13G | Apr 29, 2026 |
| State Street Corporation | 5.00% | 7.32M | 13G | Nov 10, 2025 |
Form 4
Latest trades
| Date | Insider | Type | Shares | Avg price | Owned after |
|---|---|---|---|---|---|
| Aug 4, 2026 | Lloyd Minordirector | Sale | 593 | $200.96 | 2,689 |
| Aug 3, 2026 | Lloyd Minordirector | Sale | 593 | $203.34 | 3,282 |
| Feb 12, 2026 | Nicole Murphyofficer: Head of Pharm Ops and Tech | Purchase | 3 | $195.04 | 19,611 |
| Feb 9, 2026 | Priya Singhalofficer: Head of Development | Sale | 2,660 | $199.83 | 8,043 |
| Feb 2, 2026 | Priya Singhalofficer: Head of Development | Sale | 748 | $179.30 | 6,271 |
House and Senate disclosures
| Member | Type | Amount | Owner | Traded | Disclosed |
|---|---|---|---|---|---|
| Rep. Kevin Hern · OK01 | Sale | $1,001 – $15,000 | Aug 18, 2026 | Sep 2, 2026 | |
| Rep. Kevin Hern · OK01 | Sale (Full) | $1,001 – $15,000 | Aug 17, 2026 | Sep 2, 2026 | |
| Rep. Maria Elvira Salazar · FL27 | Sale | $15,001 – $50,000 | Jun 2, 2026 | Jul 8, 2026 | |
| Rep. Gilbert Cisneros · CA31 | Purchase | $1,001 – $15,000 | Jun 5, 2026 | Jul 3, 2026 | |
| Rep. Maria Elvira Salazar · FL27 | Purchase | $1,001 – $15,000 | May 12, 2026 | Jun 9, 2026 |