Biogen Inc. Common Stock (BIIB) Ownership & Trading Activity
Institutional holders, insider transactions, and congressional trades for BIIB. 13F holdings as of 2026-06-30.
In 13F filings for the quarter ended June 30, 2026, 1,022 institutions reported holding BIIB, with 140.6 million shares worth $30.3 billion in aggregate.
Top Institutional Holders
| Institution | Shares | Value | Change |
|---|---|---|---|
| FMR | 18,217,239 | $3.9B | INCREASED |
| Vanguard | 17,817,720 | $3.8B | INCREASED |
| BlackRock | 15,985,736 | $3.5B | INCREASED |
| Primecap Management Co | 15,154,606 | $3.3B | INCREASED |
| State Street | 7,344,327 | $1.6B | INCREASED |
Recent Insider Trades
| Insider | Type | Shares | Value | Date |
|---|---|---|---|---|
| Sean Godbout (Chief Accounting Officer) | EXERCISE | 27 | 2026-10-02 | |
| Sean Godbout (Chief Accounting Officer) | TAX-W | 8 | $2K | 2026-10-02 |
| Sean Godbout (Chief Accounting Officer) | EXERCISE | 27 | 2026-10-02 | |
| Sean Godbout (Chief Accounting Officer) | AWARD | 985 | 2026-10-01 | |
| Michael Parini (Chief Legal Officer) | AWARD | 7,405 | 2026-09-01 |
Recent Congressional Trades
| Member | Type | Amount | Date |
|---|---|---|---|
| Ro Khanna (Democrat) | SALE | $1,001 - $15,000 | 2026-09-11 |
| Ro Khanna (Democrat) | PURCHASE | $1,001 - $15,000 | 2026-09-04 |
| Maria Elvira Salazar (Republican) | SALE | $1,001 - $15,000 | 2026-09-24 |
Full institutional holdings, insider history, and congressional trades for Biogen Inc. Common Stock on SentiSense.