Biogen insider activity
What the executives and directors of Biogen actually did with their own shares, decoded from their SEC Form 4 filings. Each figure says the stretch of time it covers.
−$905K
net open-market flow, 12 m
1 open-market buy, 12 m
100%
of sale value on 10b5-1 plans, 12 m
221 days since an insider bought, whole record
The tape: three years of insider trades
Open-market buy
Discretionary sale
Planned sale (10b5-1)
Reported-price path
Routine
Every marker sits at the 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 grey strip is the routine flow (grants, vestings, tax withholding and gifts) that a headline gets wrong by counting it as selling.
The 86 routine events on the chart, as a list
| Date | Insider | Shares |
|---|---|---|
| Jun 9, 2026 | SHERWIN STEPHEN A | 1,505 |
| Jun 9, 2026 | HAWKINS WILLIAM A | 1,505 |
| Jun 9, 2026 | Rowinsky Eric K | 1,505 |
| Jun 9, 2026 | Freire Maria C | 2,005 |
| Jun 9, 2026 | Mantas Jesus B | 1,505 |
| Jun 9, 2026 | Patolawala Monish D | 1,505 |
| Jun 9, 2026 | LANGER SUSAN | 1,505 |
| Jun 9, 2026 | Pangalos Menelas N | 3,875 |
| Jun 9, 2026 | Minor Lloyd | 1,505 |
| May 1, 2026 | Keeney Adam | 1,394 |
| Apr 1, 2026 | Godbout Sean | 235 |
| Feb 6, 2026 | ALEXANDER SUSAN H | 13K |
| Feb 6, 2026 | Gregory Ginger | 9,772 |
| Feb 6, 2026 | Kramer Robin | 6,546 |
| Feb 6, 2026 | Singhal Priya | 9,368 |
| Feb 6, 2026 | Viehbacher Christopher | 35K |
| Feb 6, 2026 | Izzar Rachid | 8,927 |
| Feb 6, 2026 | Murphy Nicole | 12K |
| Feb 6, 2026 | Keeney Adam | 6,663 |
| Feb 6, 2026 | Grogan Jane | 4,249 |
| Feb 6, 2026 | Godbout Sean | 1,438 |
| Jan 30, 2026 | Singhal Priya | 2,411 |
| Dec 1, 2025 | Viehbacher Christopher | 10K |
| Oct 31, 2025 | Grogan Jane | 1,032 |
| Oct 2, 2025 | Godbout Sean | 34 |
| Aug 29, 2025 | Singhal Priya | 2,476 |
| Jun 17, 2025 | SHERWIN STEPHEN A | 2,370 |
| Jun 17, 2025 | HAWKINS WILLIAM A | 2,370 |
| Jun 17, 2025 | DORSA CAROLINE | 3,160 |
| Jun 17, 2025 | Rowinsky Eric K | 2,370 |
| Jun 17, 2025 | Freire Maria C | 2,370 |
| Jun 17, 2025 | Mantas Jesus B | 2,370 |
| Jun 17, 2025 | Patolawala Monish D | 2,370 |
| Jun 17, 2025 | LANGER SUSAN | 2,370 |
| Jun 17, 2025 | Minor Lloyd | 2,370 |
| May 1, 2025 | Keeney Adam | 1,392 |
| Feb 10, 2025 | MCDONNELL MICHAEL R | 4,628 |
| Feb 10, 2025 | ALEXANDER SUSAN H | 3,382 |
| Feb 10, 2025 | Gregory Ginger | 2,793 |
| Feb 10, 2025 | Kramer Robin | 1,079 |
| Feb 10, 2025 | Singhal Priya | 1,569 |
| Feb 10, 2025 | Izzar Rachid | 1,960 |
| Feb 10, 2025 | Murphy Nicole | 2,942 |
| Feb 7, 2025 | MCDONNELL MICHAEL R | 6,053 |
| Feb 7, 2025 | ALEXANDER SUSAN H | 5,364 |
| Feb 7, 2025 | Gregory Ginger | 4,476 |
| Feb 7, 2025 | Kramer Robin | 1,967 |
| Feb 7, 2025 | Singhal Priya | 2,897 |
| Feb 7, 2025 | Viehbacher Christopher | 12K |
| Feb 7, 2025 | Izzar Rachid | 5,009 |
| Feb 7, 2025 | Murphy Nicole | 5,265 |
| Feb 7, 2025 | Keeney Adam | 2,364 |
| Feb 7, 2025 | Grogan Jane | 1,828 |
| Jan 31, 2025 | Singhal Priya | 2,406 |
| Dec 6, 2024 | Kramer Robin | 521 |
| Dec 6, 2024 | Singhal Priya | 632 |
| Nov 5, 2024 | ALEXANDER SUSAN H | 40K |
| Nov 1, 2024 | Grogan Jane | 899 |
| Aug 30, 2024 | Singhal Priya | 2,475 |
| Jun 21, 2024 | SHERWIN STEPHEN A | 1,340 |
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.
The chart, in numbers
| Flow | Shares |
|---|---|
| Granted | 14K |
| Vested / exercised | 91K |
| Bought on market | 3 |
| Withheld for tax | 34K |
| Planned sales (10b5-1) | 4,594 |
| Kept | 66K |
Skin in the game
Directly held shares as reported after each trade, indexed to 100 at the start of the window, up to 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.
The chart, in numbers
| Insider | Start of the window | Latest reported | Indexed, start = 100 |
|---|---|---|---|
| ALEXANDER SUSAN H | 44K | 42K | 95.3 |
| DORSA CAROLINE | 23K | 31K | 133.4 |
| Rowinsky Eric K | 19K | 26K | 134.5 |
| Viehbacher Christopher | 13K | 30K | 233.7 |
Who holds what
the 14 largest holdings of 21| Insider | Role | Shares held | Buys 12 m | Sales 12 m | 12 m | Last trade |
|---|---|---|---|---|---|---|
| ALEXANDER SUSAN H EVP Chief Legal Officer Last trade Oct 27, 2022 | Officer | 59K | – | – | Oct 27, 2022 | |
| DORSA CAROLINE Last trade May 2, 2025 | Director | 31K | – | – | May 2, 2025 | |
| Rowinsky Eric K Last trade Feb 15, 2024 | Director | 26K | – | – | Feb 15, 2024 | |
| MCDONNELL MICHAEL R EVP, Chief Financial Officer | CFO | 26K | – | – | – | |
| Viehbacher Christopher President and CEO | CEO | 25K | – | – | – | |
| Murphy Nicole Head of Pharm Ops and Tech Last trade Feb 12, 2026 | Officer | 20K | $585 | – | net buying over the year: 1 month buying, 0 months selling | Feb 12, 2026 |
| Gregory Ginger EVP, Human Resources Last trade Apr 28, 2023 | Officer | 19K | – | – | Apr 28, 2023 | |
| SHERWIN STEPHEN A Last trade Mar 7, 2025 | Director | 15K | – | – | Mar 7, 2025 | |
| Mantas Jesus B Last trade Feb 9, 2021 | Director | 11K | – | – | Feb 9, 2021 | |
| HAWKINS WILLIAM A | Director | 10K | – | – | – | |
| Freire Maria C | Director | 8,820 | – | – | – | |
| Kramer Robin Chief Financial Officer | CFO | 8,801 | – | – | – | |
| Izzar Rachid Head of Global Product Strat. Last trade Jul 8, 2025 | Officer | 8,204 | – | – | Jul 8, 2025 | |
| Singhal Priya Head of Development Last trade Feb 9, 2026 | Officer | 8,043 | – | $666K | net selling over the year: 0 months buying, 1 month selling | Feb 9, 2026 |
Open-market trade log
the 60 most recent of 1,427| Date | Insider | Type | Shares | Price | Value | Since trade | Filed |
|---|---|---|---|---|---|---|---|
| Aug 4, 2026 | Minor Lloyd (Director) 593 shares $200.96 +1.2% since trade filed Aug 5, 2026 | Planned sale (10b5-1) | 593 | $200.96 | $119K | +1.2% | Aug 5, 2026 |
| Aug 3, 2026 | Minor Lloyd (Director) 593 shares $203.34 +0.0% since trade filed Aug 5, 2026 | Planned sale (10b5-1) | 593 | $203.34 | $121K | +0.0% | Aug 5, 2026 |
| Feb 12, 2026 | Murphy Nicole (Officer) 3 shares $195.04 +4.3% since trade filed Feb 17, 2026 | Open-market buy | 3 | $195.04 | $585 | +4.3% | Feb 17, 2026 |
| Feb 9, 2026 | Singhal Priya (Officer) 2,660 shares $199.83 +1.8% since trade filed Feb 10, 2026 | Planned sale (10b5-1) | 2,660 | $199.83 | $532K | +1.8% | Feb 10, 2026 |
| Feb 2, 2026 | Singhal Priya (Officer) 748 shares $179.30 +13.4% since trade filed Feb 3, 2026 | Planned sale (10b5-1) | 748 | $179.30 | $134K | +13.4% | Feb 3, 2026 |
| Sep 2, 2025 | Singhal Priya (Officer) 517 shares $133.55 +52.3% since trade filed Sep 2, 2025 | Planned sale (10b5-1) | 517 | $133.55 | $69K | +52.3% | Sep 2, 2025 |
| Jul 8, 2025 | Izzar Rachid (Officer) 2,223 shares $135.00 +50.6% since trade filed Jul 16, 2025 late | Planned sale (10b5-1) | 2,223 | $135.00 | $300K | +50.6% | Jul 16, 2025 late |
| May 19, 2025 | Singhal Priya (Officer) 3,806 shares $126.25 +61.1% since trade filed May 20, 2025 | Planned sale (10b5-1) | 3,806 | $126.25 | $481K | +61.1% | May 20, 2025 |
| May 2, 2025 | DORSA CAROLINE (Director) 1,235 shares $122.72 +65.7% since trade filed May 5, 2025 | Open-market buy | 1,235 | $122.72 | $152K | +65.7% | May 5, 2025 |
| Mar 7, 2025 | SHERWIN STEPHEN A (Director) 8,760 shares $150.02 +35.5% since trade filed Mar 10, 2025 | Planned sale (10b5-1) | 8,760 | $150.02 | $1.3M | +35.5% | Mar 10, 2025 |
| Dec 9, 2024 | Singhal Priya (Officer) 110 shares $157.21 +29.3% since trade filed Dec 9, 2024 | Planned sale (10b5-1) | 110 | $157.21 | $17K | +29.3% | Dec 9, 2024 |
| Sep 3, 2024 | Singhal Priya (Officer) 431 shares $204.22 −0.4% since trade filed Sep 5, 2024 | Planned sale (10b5-1) | 431 | $204.22 | $88K | −0.4% | Sep 5, 2024 |
| Apr 2, 2024 | Singhal Priya (Officer) 93 shares $213.09 −4.6% since trade filed Apr 3, 2024 | Planned sale (10b5-1) | 93 | $213.09 | $20K | −4.6% | Apr 3, 2024 |
| Feb 22, 2024 | Singhal Priya (Officer) 262 shares $221.23 −8.1% since trade filed Feb 26, 2024 | Planned sale (10b5-1) | 262 | $221.23 | $58K | −8.1% | Feb 26, 2024 |
| Feb 16, 2024 | Singhal Priya (Officer) 108 shares $221.49 −8.2% since trade filed Feb 21, 2024 | Planned sale (10b5-1) | 108 | $221.49 | $24K | −8.2% | Feb 21, 2024 |
| Feb 15, 2024 | Rowinsky Eric K (Director) 455 shares $222.54 −8.6% since trade filed Feb 20, 2024 | Open-market buy | 455 | $222.54 | $101K | −8.6% | Feb 20, 2024 |
| Feb 12, 2024 | Singhal Priya (Officer) 419 shares $239.45 −15.1% since trade filed Feb 13, 2024 | Planned sale (10b5-1) | 419 | $239.45 | $100K | −15.1% | Feb 13, 2024 |
| Feb 2, 2024 | Singhal Priya (Officer) 634 shares $245.93 −17.3% since trade filed Feb 5, 2024 | Planned sale (10b5-1) | 634 | $245.93 | $156K | −17.3% | Feb 5, 2024 |
| Dec 11, 2023 | Singhal Priya (Officer) 110 shares $248.00 −18.0% since trade filed Dec 12, 2023 | Planned sale (10b5-1) | 110 | $248.00 | $27K | −18.0% | Dec 12, 2023 |
| Sep 5, 2023 | Singhal Priya (Officer) 431 shares $269.43 −24.5% since trade filed Sep 6, 2023 | Planned sale (10b5-1) | 431 | $269.43 | $116K | −24.5% | Sep 6, 2023 |
| Jul 3, 2023 | Singhal Priya (Officer) 81 shares $282.87 −28.1% since trade filed Jul 5, 2023 | Planned sale (10b5-1) | 81 | $282.87 | $23K | −28.1% | Jul 5, 2023 |
| Apr 28, 2023 | Gregory Ginger (Officer) 2,681 shares $300.00 −32.2% since trade filed May 2, 2023 | Planned sale (10b5-1) | 2,681 | $300.00 | $804K | −32.2% | May 2, 2023 |
| Apr 4, 2023 | Singhal Priya (Officer) 91 shares $277.11 −26.6% since trade filed Apr 6, 2023 | Planned sale (10b5-1) | 91 | $277.11 | $25K | −26.6% | Apr 6, 2023 |
| Mar 28, 2023 | Singhal Priya (Officer) 568 shares $270.06 −24.7% since trade filed Mar 30, 2023 | Discretionary sale | 568 | $270.06 | $153K | −24.7% | Mar 30, 2023 |
| Nov 14, 2022 | Gregory Ginger (Officer) 5,610 shares $300.11 −32.2% since trade filed Dec 12, 2022 late | Discretionary sale | 5,610 | $300.11 | $1.7M | −32.2% | Dec 12, 2022 late |
| Oct 27, 2022 | ALEXANDER SUSAN H (Officer) 5,532 shares $280.70 −27.6% since trade filed Oct 28, 2022 | Discretionary sale | 5,532 | $280.70 | $1.6M | −27.6% | Oct 28, 2022 |
| Jun 7, 2021 | Sandrock Alfred (Officer) 7,672 shares $440.00 filed Jun 9, 2021 | Discretionary sale | 7,672 | $440.00 | $3.4M | – | Jun 9, 2021 |
| Jun 7, 2021 | Guindo Chirfi (Officer) 3,087 shares $440.00 filed Jun 9, 2021 | Discretionary sale | 3,087 | $440.00 | $1.4M | – | Jun 9, 2021 |
| Jun 4, 2021 | Posner Brian S (Director) 360 shares $274.17 filed Jun 7, 2021 | Discretionary sale | 360 | $274.17 | $99K | – | Jun 7, 2021 |
| Feb 9, 2021 | Mantas Jesus B (Director) 898 shares $267.00 filed Feb 10, 2021 | Open-market buy | 898 | $267.00 | $240K | – | Feb 10, 2021 |
| Nov 30, 2020 | Vounatsos Michel (CEO) 3,100 shares $241.31 filed Dec 1, 2020 | Open-market buy | 3,100 | $241.31 | $748K | – | Dec 1, 2020 |
| Nov 4, 2020 | Sandrock Alfred (Officer) 1,500 shares $350.00 filed Nov 6, 2020 | Discretionary sale | 1,500 | $350.00 | $525K | – | Nov 6, 2020 |
| Mar 11, 2020 | SHERWIN STEPHEN A (Director) 270 shares $295.29 filed Mar 12, 2020 | Discretionary sale | 270 | $295.29 | $80K | – | Mar 12, 2020 |
| Mar 11, 2020 | SHERWIN STEPHEN A (Director) 2,164 shares $295.22 filed Mar 12, 2020 | Discretionary sale | 2,164 | $295.22 | $639K | – | Mar 12, 2020 |
| Dec 2, 2019 | Posner Brian S (Director) 1,055 shares $292.35 filed Dec 3, 2019 | Discretionary sale | 1,055 | $292.35 | $308K | – | Dec 3, 2019 |
| May 2, 2019 | DENNER ALEXANDER J (Director) 38K shares $231.24 filed May 2, 2019 | Open-market buy | 38K | $231.24 | $8.8M | – | May 2, 2019 |
| May 1, 2019 | DENNER ALEXANDER J (Director) 30K shares $229.46 filed May 2, 2019 | Open-market buy | 30K | $229.46 | $6.9M | – | May 2, 2019 |
| May 1, 2019 | Vounatsos Michel (CEO) 4,351 shares $231.48 filed May 2, 2019 | Open-market buy | 4,351 | $231.48 | $1.0M | – | May 2, 2019 |
| Apr 30, 2019 | DENNER ALEXANDER J (Director) 50K shares $229.25 filed May 2, 2019 | Open-market buy | 50K | $229.25 | $12M | – | May 2, 2019 |
| Mar 18, 2019 | PANGIA ROBERT W (Director) 6,114 shares $328.55 filed Mar 19, 2019 | Discretionary sale | 6,114 | $328.55 | $2.0M | – | Mar 19, 2019 |
| Feb 1, 2019 | DENNER ALEXANDER J (Director) 7,000 shares $328.45 filed Feb 1, 2019 | Open-market buy | 7,000 | $328.45 | $2.3M | – | Feb 1, 2019 |
| Jan 31, 2019 | DENNER ALEXANDER J (Director) 26K shares $330.52 filed Feb 1, 2019 | Open-market buy | 26K | $330.52 | $8.5M | – | Feb 1, 2019 |
| Jan 30, 2019 | DENNER ALEXANDER J (Director) 30K shares $324.86 filed Feb 1, 2019 | Open-market buy | 30K | $324.86 | $9.7M | – | Feb 1, 2019 |
| Sep 26, 2018 | Ehlers Michael D (Officer) 1,000 shares $350.00 filed Sep 27, 2018 | Discretionary sale | 1,000 | $350.00 | $350K | – | Sep 27, 2018 |
| Apr 25, 2018 | DENNER ALEXANDER J (Director) 48K shares $269.91 filed Apr 27, 2018 | Open-market buy | 48K | $269.91 | $13M | – | Apr 27, 2018 |
| Feb 27, 2018 | Sandrock Alfred (Officer) 259 shares $290.83 filed Feb 28, 2018 | Discretionary sale | 259 | $290.83 | $75K | – | Feb 28, 2018 |
| Feb 23, 2018 | Sandrock Alfred (Officer) 908 shares $293.44 filed Feb 27, 2018 | Discretionary sale | 908 | $293.44 | $266K | – | Feb 27, 2018 |
| Feb 20, 2018 | Sandrock Alfred (Officer) 743 shares $292.00 filed Feb 21, 2018 | Discretionary sale | 743 | $292.00 | $217K | – | Feb 21, 2018 |
| Feb 15, 2018 | Sandrock Alfred (Officer) 1,294 shares $298.85 filed Feb 20, 2018 | Discretionary sale | 1,294 | $298.85 | $387K | – | Feb 20, 2018 |
| Jan 9, 2018 | PANGIA ROBERT W (Director) 5,832 shares $329.65 filed Jan 10, 2018 | Discretionary sale | 5,832 | $329.65 | $1.9M | – | Jan 10, 2018 |
| Dec 29, 2017 | Vounatsos Michel (CEO) 780 shares $320.55 filed Jan 2, 2018 | Open-market buy | 780 | $320.55 | $250K | – | Jan 2, 2018 |
| Nov 29, 2017 | DENNER ALEXANDER J (Director) 10K shares $319.84 filed Nov 30, 2017 | Open-market buy | 10K | $319.84 | $3.2M | – | Nov 30, 2017 |
| Nov 28, 2017 | DENNER ALEXANDER J (Director) 20K shares $316.12 filed Nov 30, 2017 | Open-market buy | 20K | $316.12 | $6.3M | – | Nov 30, 2017 |
| Jul 25, 2017 | ALEXANDER SUSAN H (Officer) 4,974 shares $290.01 filed Jul 26, 2017 | Discretionary sale | 4,974 | $290.01 | $1.4M | – | Jul 26, 2017 |
| Jul 19, 2017 | ALEXANDER SUSAN H (Officer) 7,758 shares $285.00 filed Jul 20, 2017 | Discretionary sale | 7,758 | $285.00 | $2.2M | – | Jul 20, 2017 |
| Jun 9, 2017 | Posner Brian S (Director) 1,084 shares $256.31 filed Jun 12, 2017 | Discretionary sale | 1,084 | $256.31 | $278K | – | Jun 12, 2017 |
| May 1, 2017 | Vounatsos Michel (CEO) 1,402 shares $271.35 filed May 2, 2017 | Open-market buy | 1,402 | $271.35 | $380K | – | May 2, 2017 |
| Apr 27, 2017 | DENNER ALEXANDER J (Director) 15K shares $278.58 filed May 1, 2017 | Open-market buy | 15K | $278.58 | $4.2M | – | May 1, 2017 |
| Apr 27, 2017 | DENNER ALEXANDER J (Director) 59K shares $278.48 filed May 1, 2017 | Open-market buy | 59K | $278.48 | $16M | – | May 1, 2017 |
| Apr 25, 2017 | Clancy Paul J (CFO) 9,892 shares $290.00 filed Apr 27, 2017 | Discretionary sale | 9,892 | $290.00 | $2.9M | – | Apr 27, 2017 |
“Since trade” compares with the latest insider-implied price, not a market quote: these pages are built from filings alone. A role here is the one on that day's Form 4, so somebody promoted since appears under both titles.
Filing hygiene
132 Forms 4, 3 years
2 filed late
0 amendments
1.8 avg. days to file
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.