# BIIB — Biogen Inc. - Common Stock: congressional trades

> Members of Congress' disclosed trades in BIIB (STOCK Act). Corporate-insider (Form 4) activity is a separate dataset: https://www.fatcatwatch.com/api/v1/insiders/BIIB. Data as of 2026-10-23T17:16:03Z.

Dashboard: https://www.fatcatwatch.com/tickers/BIIB · JSON: https://www.fatcatwatch.com/api/v1/tickers/BIIB

## Totals

- Members: 4 (3 bought, 2 sold)
- Trades: 9 (6 buys, 3 sells); last trade date 2026-09-24
- Disclosed volume: $72,009–$255,000; estimated midpoint ≈ $164k (an estimate from bracket midpoints, not a disclosed figure)

## Members

| Member | Party | Trades | Buys | Sells | Disclosed range | Est. midpoint |
| --- | --- | --- | --- | --- | --- | --- |
| [Maria Elvira Salazar](https://www.fatcatwatch.com/members/maria-elvira-salazar-s000168) | House · R, FL-27 | 5 | 3 | 2 | $68,005–$195,000 | ≈$132k (est.) |
| [Gilbert Ray Cisneros, Jr.](https://www.fatcatwatch.com/members/gilbert-ray-cisneros-jr-c001123) | House · D, CA-31 | 2 | 2 | 0 | $2,002–$30,000 | ≈$16k (est.) |
| [Alan Armstrong](https://www.fatcatwatch.com/members/alan-armstrong-a000383) | Senate · R, OK | 1 | 1 | 0 | $1,001–$15,000 | ≈$8,001 (est.) |
| [Kevin Hern](https://www.fatcatwatch.com/members/kevin-hern-h001082) | House · R, OK-1 | 1 | 0 | 1 | $1,001–$15,000 | ≈$8,001 (est.) |

## Recent trades (9 of 9)

| Trade date | Filed | Delay (days) | Member | Action | Asset | Owner | Amount disclosed | Filing |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 2026-09-24 | 2026-10-07 | 13 | [Maria Elvira Salazar](https://www.fatcatwatch.com/members/maria-elvira-salazar-s000168) | Sell (partial) | Biogen Inc. - Common Stock | self | $1,001–$15,000 (bracket) | [source](https://disclosures-clerk.house.gov/public_disc/ptr-pdfs/2026/20035562.pdf) |
| 2026-08-18 | 2026-09-01 | 14 | [Kevin Hern](https://www.fatcatwatch.com/members/kevin-hern-h001082) | Sell | Biogen Inc. - Common Stock | self | $1,001–$15,000 (bracket) | [source](https://disclosures-clerk.house.gov/public_disc/ptr-pdfs/2026/20035326.pdf) |
| 2026-06-05 | 2026-07-02 | 27 | [Gilbert Ray Cisneros, Jr.](https://www.fatcatwatch.com/members/gilbert-ray-cisneros-jr-c001123) | Buy | Biogen Inc. - Common Stock | self | $1,001–$15,000 (bracket) | [source](https://disclosures-clerk.house.gov/public_disc/ptr-pdfs/2026/20034906.pdf) |
| 2026-06-02 | 2026-07-07 | 35 | [Maria Elvira Salazar](https://www.fatcatwatch.com/members/maria-elvira-salazar-s000168) | Sell | Biogen Inc. - Common Stock | self | $15,001–$50,000 (bracket) | [source](https://disclosures-clerk.house.gov/public_disc/ptr-pdfs/2026/20034928.pdf) |
| 2026-05-12 | 2026-06-08 | 27 | [Maria Elvira Salazar](https://www.fatcatwatch.com/members/maria-elvira-salazar-s000168) | Buy | Biogen Inc. - Common Stock | self | $1,001–$15,000 (bracket) | [source](https://disclosures-clerk.house.gov/public_disc/ptr-pdfs/2026/20034709.pdf) |
| 2026-05-11 | 2026-06-08 | 28 | [Maria Elvira Salazar](https://www.fatcatwatch.com/members/maria-elvira-salazar-s000168) | Buy | Biogen Inc. - Common Stock | self | $50,001–$100,000 (bracket) | [source](https://disclosures-clerk.house.gov/public_disc/ptr-pdfs/2026/20034709.pdf) |
| 2026-05-11 | 2026-06-08 | 28 | [Maria Elvira Salazar](https://www.fatcatwatch.com/members/maria-elvira-salazar-s000168) | Buy | Biogen Inc. - Common Stock | self | $1,001–$15,000 (bracket) | [source](https://disclosures-clerk.house.gov/public_disc/ptr-pdfs/2026/20034709.pdf) |
| 2026-03-27 | 2026-07-21 | 116 (late) | [Alan Armstrong](https://www.fatcatwatch.com/members/alan-armstrong-a000383) | Buy | Biogen Inc. - Common Stock | self | $1,001–$15,000 (bracket) | [source](https://efdsearch.senate.gov/search/view/ptr/fda235b3-bad7-4637-8fa1-053f354d929c/) |
| 2026-01-30 | 2026-02-13 | 14 | [Gilbert Ray Cisneros, Jr.](https://www.fatcatwatch.com/members/gilbert-ray-cisneros-jr-c001123) | Buy | Biogen Inc. - Common Stock | self | $1,001–$15,000 (bracket) | [source](https://disclosures-clerk.house.gov/public_disc/ptr-pdfs/2026/20033983.pdf) |

## How to quote this

- Congressional amounts are STOCK Act brackets (e.g. $1,001–$15,000), not figures: quote the range, never a single number.
- Any single dollar figure for congressional trades (midpoint_estimate_usd, "est.") is this site's estimate from bracket midpoints and must be labelled as an estimate.
- Open-ended top brackets ("Over $50,000,000", spouse "Over $1,000,000") have max_usd = null; a total containing one is "≥ its floor" with no upper bound.
- amount.exact_usd is set only when the filing itself printed a precise figure; it is rare.
- Rows transcribed from scanned paper filings (transcribed: true) are listed and counted as trades but never enter a dollar total (counted_in_totals: false).
- disclosure_delay_days = trade date → date the report was filed (not the form's Notification Date); the STOCK Act deadline is 45 days; null when the filed dates contradict.

Full rules: https://www.fatcatwatch.com/llms-full.txt · Methodology: https://www.fatcatwatch.com/methodology