What the executives and directors of Biogen actually did with their own shares, decoded from three years of SEC Form 4 filings.
The tape: three years of insider trades
Every marker sits at the exact price reported on the Form 4. The line is the monthly median of all prices insiders reported, so the chart needs no market feed; the gray strip is routine flow (vestings, tax withholding, gifts) that headlines love to miscount as selling.
Where the shares went, last 12 months
Every Form 4 movement decomposed: what flowed in (grants, vested equity, purchases) and what flowed out (tax withholding, plan sales, discretionary sales, gifts). Counted in shares, because grants carry no price.
Skin in the game
Directly held shares as reported after each trade, indexed to 100 five years back. Direct holdings only: trust and family-entity positions are per-entity in the filings and do not sum honestly, so this chart refuses to guess. The steps are the trades.
Who holds what
| Insider | Role | Shares held | Buys 12 m | Sales 12 m |
|---|---|---|---|---|
| ALEXANDER SUSAN H EVP Chief Legal Officer | Officer | 58.5K | — | — |
| DORSA CAROLINE | Director | 31K | — | — |
| Rowinsky Eric K | Director | 25.8K | — | — |
| MCDONNELL MICHAEL R EVP, Chief Financial Officer | CFO | 25.7K | — | — |
| Viehbacher Christopher President and CEO | CEO | 25.5K | — | — |
| Murphy Nicole Head of Pharm Ops and Tech | Officer | 19.6K | $585 | — |
| Gregory Ginger EVP, Human Resources | Officer | 19.4K | — | — |
| SHERWIN STEPHEN A | Director | 15.2K | — | — |
| Mantas Jesus B | Director | 11.3K | — | — |
| HAWKINS WILLIAM A | Director | 10.4K | — | — |
| Freire Maria C | Director | 8,820 | — | — |
| Kramer Robin Chief Financial Officer | CFO | 8,801 | — | — |
| Izzar Rachid Head of Global Product Strat. | Officer | 8,204 | — | — |
| Singhal Priya Head of Development | Officer | 8,043 | — | $735K |
Open-market trade log
| Date | Insider | Type | Shares | Price | Value |
|---|---|---|---|---|---|
| 2026-08-04 | Minor Lloyd (Director) | Planned sale (10b5-1) | 593 | $200.96 | $119K |
| 2026-08-03 | Minor Lloyd (Director) | Planned sale (10b5-1) | 593 | $203.34 | $121K |
| 2026-02-12 | Murphy Nicole (Officer) | Open-market buy | 3 | $195.04 | $585 |
| 2026-02-09 | Singhal Priya (Officer) | Planned sale (10b5-1) | 2,660 | $199.83 | $532K |
| 2026-02-02 | Singhal Priya (Officer) | Planned sale (10b5-1) | 748 | $179.30 | $134K |
| 2025-09-02 | Singhal Priya (Officer) | Planned sale (10b5-1) | 517 | $133.55 | $69K |
| 2025-07-08 | Izzar Rachid (Officer) | Planned sale (10b5-1) | 2,223 | $135.00 | $300K |
| 2025-05-19 | Singhal Priya (Officer) | Planned sale (10b5-1) | 3,806 | $126.25 | $481K |
| 2025-05-02 | DORSA CAROLINE (Director) | Open-market buy | 1,235 | $122.72 | $152K |
| 2025-03-07 | SHERWIN STEPHEN A (Director) | Planned sale (10b5-1) | 8,760 | $150.02 | $1.3M |
| 2024-12-09 | Singhal Priya (Officer) | Planned sale (10b5-1) | 110 | $157.21 | $17K |
| 2024-09-03 | Singhal Priya (Officer) | Planned sale (10b5-1) | 431 | $204.22 | $88K |
| 2024-04-02 | Singhal Priya (Officer) | Planned sale (10b5-1) | 93 | $213.09 | $20K |
| 2024-02-22 | Singhal Priya (Officer) | Planned sale (10b5-1) | 262 | $221.23 | $58K |
| 2024-02-16 | Singhal Priya (Officer) | Planned sale (10b5-1) | 108 | $221.49 | $24K |
| 2024-02-15 | Rowinsky Eric K (Director) | Open-market buy | 455 | $222.54 | $101K |
| 2024-02-12 | Singhal Priya (Officer) | Planned sale (10b5-1) | 419 | $239.45 | $100K |
| 2024-02-02 | Singhal Priya (Officer) | Planned sale (10b5-1) | 634 | $245.93 | $156K |
| 2023-12-11 | Singhal Priya (Officer) | Planned sale (10b5-1) | 110 | $248.00 | $27K |
| 2023-09-05 | Singhal Priya (Officer) | Planned sale (10b5-1) | 431 | $269.43 | $116K |
| 2023-07-03 | Singhal Priya (Officer) | Planned sale (10b5-1) | 81 | $282.87 | $23K |
| 2023-04-28 | Gregory Ginger (Officer) | Planned sale (10b5-1) | 2,681 | $300.00 | $804K |
| 2023-04-04 | Singhal Priya (Officer) | Planned sale (10b5-1) | 91 | $277.11 | $25K |
| 2023-03-28 | Singhal Priya (Officer) | Discretionary sale | 568 | $270.06 | $153K |
| 2022-11-14 | Gregory Ginger (Officer) | Discretionary sale | 5,610 | $300.11 | $1.7M |
| 2022-10-27 | ALEXANDER SUSAN H (Officer) | Discretionary sale | 5,532 | $280.70 | $1.6M |
| 2021-06-07 | Sandrock Alfred (Officer) | Discretionary sale | 7,672 | $440.00 | $3.4M |
| 2021-06-07 | Guindo Chirfi (Officer) | Discretionary sale | 3,087 | $440.00 | $1.4M |
| 2021-06-04 | Posner Brian S (Director) | Discretionary sale | 360 | $274.17 | $99K |
| 2021-02-09 | Mantas Jesus B (Director) | Open-market buy | 898 | $267.00 | $240K |
| 2020-11-30 | Vounatsos Michel (CEO) | Open-market buy | 3,100 | $241.31 | $748K |
| 2020-11-04 | Sandrock Alfred (Officer) | Discretionary sale | 1,500 | $350.00 | $525K |
| 2020-03-11 | SHERWIN STEPHEN A (Director) | Discretionary sale | 270 | $295.29 | $80K |
| 2020-03-11 | SHERWIN STEPHEN A (Director) | Discretionary sale | 2,164 | $295.22 | $639K |
| 2019-12-02 | Posner Brian S (Director) | Discretionary sale | 1,055 | $292.35 | $308K |
| 2019-05-02 | DENNER ALEXANDER J (Director) | Open-market buy | 38K | $231.24 | $8.8M |
| 2019-05-01 | DENNER ALEXANDER J (Director) | Open-market buy | 30K | $229.46 | $6.9M |
| 2019-05-01 | Vounatsos Michel (CEO) | Open-market buy | 4,351 | $231.48 | $1M |
| 2019-04-30 | DENNER ALEXANDER J (Director) | Open-market buy | 50.3K | $229.25 | $11.5M |
| 2019-03-18 | PANGIA ROBERT W (Director) | Discretionary sale | 6,114 | $328.55 | $2M |
| 2019-02-01 | DENNER ALEXANDER J (Director) | Open-market buy | 7,000 | $328.45 | $2.3M |
| 2019-01-31 | DENNER ALEXANDER J (Director) | Open-market buy | 25.8K | $330.52 | $8.5M |
| 2019-01-30 | DENNER ALEXANDER J (Director) | Open-market buy | 30K | $324.86 | $9.7M |
| 2018-09-26 | Ehlers Michael D (Officer) | Discretionary sale | 1,000 | $350.00 | $350K |
| 2018-04-25 | DENNER ALEXANDER J (Director) | Open-market buy | 48K | $269.91 | $13M |
| 2018-02-27 | Sandrock Alfred (Officer) | Discretionary sale | 259 | $290.83 | $75K |
| 2018-02-23 | Sandrock Alfred (Officer) | Discretionary sale | 908 | $293.44 | $266K |
| 2018-02-20 | Sandrock Alfred (Officer) | Discretionary sale | 743 | $292.00 | $217K |
| 2018-02-15 | Sandrock Alfred (Officer) | Discretionary sale | 1,294 | $298.85 | $387K |
| 2018-01-09 | PANGIA ROBERT W (Director) | Discretionary sale | 5,832 | $329.65 | $1.9M |
| 2017-12-29 | Vounatsos Michel (CEO) | Open-market buy | 780 | $320.55 | $250K |
| 2017-11-29 | DENNER ALEXANDER J (Director) | Open-market buy | 10K | $319.84 | $3.2M |
| 2017-11-28 | DENNER ALEXANDER J (Director) | Open-market buy | 20K | $316.12 | $6.3M |
| 2017-07-25 | ALEXANDER SUSAN H (Officer) | Discretionary sale | 4,974 | $290.01 | $1.4M |
| 2017-07-19 | ALEXANDER SUSAN H (Officer) | Discretionary sale | 7,758 | $285.00 | $2.2M |
| 2017-06-09 | Posner Brian S (Director) | Discretionary sale | 1,084 | $256.31 | $278K |
| 2017-05-01 | Vounatsos Michel (CEO) | Open-market buy | 1,402 | $271.35 | $380K |
| 2017-04-27 | DENNER ALEXANDER J (Director) | Open-market buy | 15K | $278.58 | $4.2M |
| 2017-04-27 | DENNER ALEXANDER J (Director) | Open-market buy | 58.9K | $278.48 | $16.4M |
| 2017-04-25 | Clancy Paul J (CFO) | Discretionary sale | 9,892 | $290.00 | $2.9M |
“Since trade” compares with the latest insider-implied price, not a market quote; this site carries no market data by design.
Filing hygiene
How to read this
A Form 4 transaction code decides everything. P is an open-market purchase and S an open-market sale; those two are the only codes where an insider chose to trade. A is a grant, M an option exercise or vesting, F shares withheld to cover tax, G a gift. Most “insiders dumped billions” headlines are code F and M mechanics.
Sales flagged 10b5-1 run on a plan the insider adopted in advance; since 2023 every Form 4 carries that flag. Buys have historically predicted returns, sales mostly have not, and this page states filings, not advice.