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Are Members of Congress Buying or Selling Biogen?
2 members of the U.S. Congress have traded Biogen (BIIB) stock in the past 90 days, across 2 buys and 1 sell. Congressional trades are reported under the STOCK Act and are typically disclosed within 45 days of the transaction.
Congressional trading is one of the alternative data signals AltIndex tracks as part of the BIIB AI Score. For corporate insider activity, see BIIB insider transactions. To browse trades across every ticker, visit the Congress Trading tracker.
Which Congress Members Are Trading Biogen?
| Member of Congress | Activity | Trades | Last Trade |
|---|---|---|---|
| Maria Elvira Salazar | Bought $83,000 | 3 | Jun 2, 2026 |
| Ro Khanna | Mixed $16,000 | 2 | Nov 15, 2024 |
| Rob Bresnahan | Bought $16,000 | 2 | May 15, 2025 |
| Gilbert Cisneros | Bought $16,000 | 2 | Jun 5, 2026 |
BIIB Congressional Trade History
| Member of Congress | Trade Date | Type | Estimated Size |
|---|---|---|---|
| Gilbert Cisneros | Jun 5, 2026 | Buy | $1K – $15K |
| Maria Elvira Salazar | Jun 2, 2026 | Sell | $15K – $50K |
| Maria Elvira Salazar | May 12, 2026 | Buy | $1K – $15K |
| Maria Elvira Salazar | May 11, 2026 | Buy | $50K – $100K |
| Gilbert Cisneros | Jan 30, 2026 | Buy | $1K – $15K |
| Rob Bresnahan | May 15, 2025 | Buy | $1K – $15K |
| Rob Bresnahan | Feb 25, 2025 | Buy | $1K – $15K |
| Ro Khanna | Nov 15, 2024 | Buy | $1K – $15K |
| Ro Khanna | Sep 9, 2024 | Sell | $1K – $15K |
Frequently Asked Questions: Biogen Congress Trading
In the past 90 days, members of Congress have made 2 purchases and 1 sale of BIIB stock. The net buying may reflect confidence in the stock. Congressional trades are disclosed under the STOCK Act — view the full history on this page.
Some research has found that congressional stock trades have at times outperformed the market, possibly due to informational advantages. AltIndex tracks these trades as one of 25+ signals in the AI Score. See the full Congress Trading tracker for all recent trades.
Gilbert Cisneros bought Biogen (BIIB) stock most recently, on June 5, 2026.
The estimated net value of congressional trades in Biogen over the past 2 years is positive, at $82,000, meaning members of Congress have on balance bought more than they have sold.
Members of Congress can have early visibility into legislation, regulation, and government contracts that may affect a company. Tracking their disclosed trades — alongside other signals — can offer additional context for investment decisions.
