BIIB Congressional Stock Trades
BIOGEN INC. CMN
Last disclosed trade Aug 18
Every disclosed trade in BIIB by members of Congress under the STOCK Act, parsed by Coldpine. Informational only, sourced from public filings. Not investment advice.
Sample · the intelligence layer
Shri Thanedar · Sold $BIIB · Jan 23 · $15K–$50K
1 other member traded this name in the same window.
Every disclosed trade in the database gets this treatment: a four-factor score and a written read from Coldpine’s AI-based analysis. Informational only, not investment advice. Create a free account for every scored trade →
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The record on $BIIB
Coldpine has parsed 38 disclosed trades in $BIIB by 7 members of Congress, drawn from 27 periodic transaction reports dated Jan 9, 2023 through Aug 18, 2026. That is 37 trades from House members and 1 trade from senators, filed 30 by Democrats and 8 by Republicans.
Of the 37 trades with a known filing lag, 1 was reported more than 45 days after the trade date, outside the window the STOCK Act sets. The median lag was 25 days. The longest was 116 days: a $BIIB purchase by Alan Armstrong dated Mar 27, 2026, disclosed Jul 21, 2026. How late filing is measured across all of Congress is in the late-filers study.
29 of the 32 trades that list an account holder (91%) were reported under a spouse, dependent child, or joint account rather than the member directly.
Rohit Khanna filed the most $BIIB purchases (18), and Rohit Khanna the most sales (11).
Activity peaked in 2024 with 13 trades. The busiest single month was May 2025, when 2 different members disclosed $BIIB trades.
Across the 23 purchases Coldpine can price, $BIIB moved -0.29% on average between the trade date and the disclosure date, against +1.76% for the S&P 500 over the same windows. The stock was higher at disclosure than at the trade in 39% of those purchases. That is a record of what already happened, not a forecast. Method: what stocks do before Congress discloses.
Members who trade BIIB
Recent disclosed trades in BIIB
| Date | Member | Type | Amount |
|---|---|---|---|
| Aug 18 | Kevin Hern(OK) | sell | $1K–$15K |
| Jun 2 | Maria Elvira Salazar(FL) | sell | $15K–$50K |
| May 12 | Maria Elvira Salazar(FL) | buy | $1K–$15K |
| May 11 | Maria Elvira Salazar(FL) | buy | $50K–$100K |
| May 11 | Maria Elvira Salazar(FL) | buy | $1K–$15K |
| Apr 13 | Rohit Khanna(CA) | sell | $1K–$15K |
| Mar 27 | Alan Armstrong(OK) | buy | $1K–$15K |
| Aug 26 | Rohit Khanna(CA) | buy | $1K–$15K |
| May 19 | Rohit Khanna(CA) | buy | $1K–$15K |
| May 15 | Rob Bresnahan(PA) | buy | $1K–$15K |
| Feb 25 | Rohit Khanna(CA) | buy | $1K–$15K |
| Feb 19 | Rohit Khanna(CA) | sell | $1K–$15K |
| Jan 17 | Rohit Khanna(CA) | sell | $1K–$15K |
| Dec 18 | Rohit Khanna(CA) | sell | $1K–$15K |
| Dec 16 | Rohit Khanna(CA) | buy | $1K–$15K |
| Nov 15 | Rohit Khanna(CA) | buy | $1K–$15K |
| Oct 14 | Rohit Khanna(CA) | buy | $1K–$15K |
| Sep 9 | Rohit Khanna(CA) | sell | $1K–$15K |
| Sep 9 | Rohit Khanna(CA) | buy | $1K–$15K |
| Sep 9 | Rohit Khanna(CA) | buy | $1K–$15K |
Showing 20 of 38 disclosed trades.
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Create a free accountData sourced from public STOCK Act disclosures. Coldpine is a publisher of intelligence on congressional disclosures, not an investment adviser. See full history and scores, free with an account →