Congress Trades in Biogen Inc. (BIIB)
16 members of Congress have disclosed trading BIIB.
Total trades
34
Purchases
17
Sales
17
Members
16
Est. volume
$363,001
Last traded
May 12, 2026
Buyers' avg return
+3.2%
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16 members of Congress have disclosed trading Biogen Inc. (BIIB), with 34 transactions in total — 17 purchases and 17 sales worth an estimated $363,001 at range midpoints, leaning evenly between buying and selling. The most active BIIB trader is Gilbert Cisneros (6 disclosures). The most recent disclosed BIIB trade was on May 12, 2026. Across the 4 disclosed BIIB purchases we can price, the average return since disclosure is +3.2% (information only, not advice). See our full BIIB fundamentals page for price, valuation and a return calculator.
Every disclosed BIIB trade
| Disclosed | Politician | Type | Amount | Traded | |
|---|---|---|---|---|---|
| Jun 1, 2026 | Maria Elvira Salazar R | Purchase | $1,001 - $15,000 | May 12, 2026 | filing ↗ |
| Jun 1, 2026 | Maria Elvira Salazar R | Purchase | $1,001 - $15,000 | May 11, 2026 | filing ↗ |
| Jun 1, 2026 | Maria Elvira Salazar R | Purchase | $50,001 | May 11, 2026 | filing ↗ |
| Feb 11, 2026 | Gilbert Cisneros D | Purchase | $1,001 - $15,000 | Jan 30, 2026 | filing ↗ |
| Sep 6, 2022 | Kathy Manning D | Sale | $1,001 - $15,000 | Aug 3, 2022 | filing ↗ |
| Apr 11, 2022 | Josh Gottheimer D | Sale | $1,001 - $15,000 | Mar 17, 2022 | filing ↗ |
| Nov 4, 2021 | Josh Gottheimer D | Purchase | $1,001 - $15,000 | Oct 18, 2021 | filing ↗ |
| Jul 12, 2021 | Josh Gottheimer D | Purchase | $1,001 - $15,000 | Jun 8, 2021 | filing ↗ |
| Feb 19, 2021 | Peter Meijer R | Sale | $15,001 - $50,000 | Feb 16, 2021 | filing ↗ |
| Feb 10, 2021 | Christopher L. Jacobs | Sale | $1,001 - $15,000 | Jan 4, 2021 | filing ↗ |
| Jan 8, 2021 | Gilbert Cisneros D | Sale | $1,001 - $15,000 | Dec 22, 2020 | filing ↗ |
| Oct 13, 2020 | Gilbert Cisneros D | Purchase | $1,001 - $15,000 | Sep 16, 2020 | filing ↗ |
| Aug 7, 2020 | Josh Gottheimer D | Purchase | $1,001 - $15,000 | Jul 7, 2020 | filing ↗ |
| Apr 15, 2020 | Gilbert Cisneros D | Sale | $1,001 - $15,000 | Mar 18, 2020 | filing ↗ |
| Mar 10, 2020 | Gilbert Cisneros D | Purchase | $1,001 - $15,000 | Feb 7, 2020 | filing ↗ |
| Jun 30, 2019 | Donna Shalala D | Sale | $1,001 - $15,000 | Jun 24, 2019 | filing ↗ |
| Jun 7, 2019 | Gilbert Cisneros D | Sale | $1,001 - $15,000 | May 9, 2019 | filing ↗ |
| Mar 25, 2019 | Nicholas Van Taylor | Sale | $1,001 - $15,000 | Mar 25, 2019 | filing ↗ |
| Jun 1, 2018 | Thomas MacArthur R | Purchase | $1,001 - $15,000 | May 2, 2018 | filing ↗ |
| Apr 4, 2017 | Gary Palmer R | Purchase | $1,001 - $15,000 | Apr 4, 2017 | filing ↗ |
| Feb 2, 2017 | Cheri Bustos D | Sale | $15,001 - $50,000 | Jan 30, 2017 | filing ↗ |
| Jan 1, 2017 | Thomas MacArthur R | Purchase | $1,001 - $15,000 | Dec 8, 2016 | filing ↗ |
| Jun 30, 2016 | Ed Whitfield R | Sale | $1,001 - $15,000 | Jun 3, 2016 | filing ↗ |
| Apr 30, 2016 | Ed Whitfield R | Sale | $1,001 - $15,000 | Apr 13, 2016 | filing ↗ |
| Apr 4, 2016 | K. Michael Conaway R | Sale | $1,001 - $15,000 | Apr 1, 2016 | filing ↗ |
| Jan 31, 2016 | Ed Whitfield R | Purchase | $1,001 - $15,000 | Jan 19, 2016 | filing ↗ |
| Oct 1, 2015 | Thomas MacArthur R | Purchase | $1,001 - $15,000 | Sep 22, 2015 | filing ↗ |
| Sep 12, 2015 | Lamar Smith R | Purchase | $1,001 - $15,000 | Aug 27, 2015 | filing ↗ |
| Aug 21, 2015 | Rubén Hinojosa D | Sale | $1,001 - $15,000 | Aug 21, 2015 | filing ↗ |
| Jul 25, 2015 | Alan S. Lowenthal D | Sale | $1,001 - $15,000 | Jul 23, 2015 | filing ↗ |
| Feb 12, 2015 | K. Michael Conaway R | Purchase | $1,001 - $15,000 | Feb 9, 2015 | filing ↗ |
| Feb 27, 2014 | Rubén Hinojosa D | Sale | $1,001 - $15,000 | Feb 27, 2014 | filing ↗ |
| Jan 24, 2014 | Rubén Hinojosa D | Purchase | $1,001 - $15,000 | Jan 24, 2014 | filing ↗ |
| Dec 20, 2013 | Rubén Hinojosa D | Sale | $1,001 - $15,000 | Dec 20, 2013 | filing ↗ |
Most active BIIB traders in Congress
Gilbert Cisneros
Democrat
6 trades
Josh Gottheimer
Democrat
4 trades
Rubén Hinojosa
Democrat
4 trades
Maria Elvira Salazar
Republican
3 trades
Thomas MacArthur
Republican
3 trades
Ed Whitfield
Republican
3 trades
K. Michael Conaway
Republican
2 trades
Kathy Manning
Democrat
1 trade
Source: US House Clerk Periodic Transaction Reports. Amounts are disclosed as ranges; estimates use range midpoints. Data may be delayed or contain filer errors. Updated Jun 29, 2026. Not investment advice.