Insider trading

Period: 120 months Stock: BIIB + Add filter Clear all
Views & alerts

Save your view. Keep the filter you have built, and get an email when a new filing matches it. A free account does both.

When

Period

How far back the list reaches. Filings arrive days after the trade, so the newest rows always lag a little.

64 decisions over 120 months
Who

Role

The position the person holds at the company, read from the title on the filing. A chief executive who is also a director counts as the chief executive.

64 decisions over 120 months
The trade

Type of trade

Purchases, sales, or cluster buys: companies where 3 or more insiders bought within 30 days. The number beside each is what that choice would give.

64 decisions over 120 months
The trade

Minimum amount

Hides rows under this value. The amount is the shares traded times the price on the filing.

64 decisions over 120 months
The trade

Plan

  • Discretionary: they chose to sell that week.
  • Scheduled: a 10b5-1 plan fixed the sale months in advance, so the timing says nothing about what they knew.
  • Not stated: filed before the SEC added the box in April 2023, which is most of the older half of this database.
64 decisions over 120 months
The trade

Share of their own holding

How much of what they already held the trade moved. Selling a tenth of a stake is not the same act as selling all of it.

At least
64 decisions over 120 months
Ownership

What the chief executive holds

The value of the chief executive’s stock measured against base salary. The salary comes from the company’s own proxy. Companies with no figure are in neither direction.

64 decisions over 120 months
Stock
Insider
Type ?
Why it stands out
4 Aug 2026
Minor Lloyd Director
Sold on a plan
$119.17K 593 at 200.96
18.1%
Planned (10b5-1)
3 Aug 2026
Minor Lloyd Director
Sold on a plan
$120.58K 593 at 203.34
15.3%
Planned (10b5-1)
12 Feb 2026
Murphy Nicole Head of Pharm Ops and Tech
Bought
$585.11 3 at 195.04
0.0%
First buy on file
9 Feb 2026
Singhal Priya Head of Development
Sold on a plan
$531.55K 2,660 at 199.83
24.9%
Planned (10b5-1)
2 Feb 2026
Singhal Priya Head of Development
Sold on a plan
$134.12K 748 at 179.30
10.7%
Planned (10b5-1)
2 Sep 2025
Singhal Priya Head of Development
Sold on a plan
$69.05K 517 at 133.55
8.2%
Planned (10b5-1)
8 Jul 2025
Izzar Rachid Head of Global Product Strat.
Sold on a plan
$300.11K 2,223 at 135.00
26.0%
Planned (10b5-1)
19 May 2025
Singhal Priya Head of Development
Sold on a plan
$480.51K 3,806 at 126.25
41.2%
Planned (10b5-1)
2 May 2025
DORSA CAROLINE Director
Bought
$151.56K 1,235 at 122.72
4.6%
First buy on file
7 Mar 2025
Sold on a plan
$1.31M 8,760 at 150.02
43.6%
Planned (10b5-1)
9 Dec 2024
Singhal Priya Head of Development
Sold on a plan
$17.29K 110 at 157.21
2.0%
Planned (10b5-1)
3 Sep 2024
Singhal Priya Head of Development
Sold on a plan
$88.02K 431 at 204.22
7.5%
Planned (10b5-1)
2 Apr 2024
Singhal Priya Head of Development
Sold on a plan
$19.82K 93 at 213.09
1.9%
Planned (10b5-1)
22 Feb 2024
Singhal Priya Head of Development
Sold on a plan
$57.96K 262 at 221.23
5.1%
Planned (10b5-1)
16 Feb 2024
Singhal Priya Head of Development
Sold on a plan
$23.92K 108 at 221.49
2.1%
Planned (10b5-1)
15 Feb 2024
Rowinsky Eric K Director
Bought
$101.26K 455 at 222.54
2.3%
First buy on file
12 Feb 2024
Singhal Priya Head of Development
Sold on a plan
$100.33K 419 at 239.45
8.5%
Planned (10b5-1)
2 Feb 2024
Singhal Priya Head of Development
Sold on a plan
$155.92K 634 at 245.93
13.4%
Planned (10b5-1)
11 Dec 2023
Singhal Priya Head of Development
Sold on a plan
$27.28K 110 at 248.00
3.1%
Planned (10b5-1)
5 Sep 2023
Singhal Priya Head of Development
Sold on a plan
$116.12K 431 at 269.43
11.4%
Planned (10b5-1)
3 Jul 2023
Singhal Priya Head of Development
Sold on a plan
$22.91K 81 at 282.87
2.7%
Planned (10b5-1)
28 Apr 2023
Gregory Ginger EVP, Human Resources
Sold on a plan
$804.30K 2,681 at 300.00
24.0%
Planned (10b5-1)
4 Apr 2023
Singhal Priya Head of Development
Sold on a plan
$25.22K 91 at 277.11
3.1%
Planned (10b5-1)
28 Mar 2023
Singhal Priya Head of Development
Sold at will
$153.39K 568 at 270.06
16.7%
Not planned
14 Nov 2022
Gregory Ginger EVP, Human Resources
Sold, plan not stated
$1.68M 5,610 at 300.11
49.6%
27 Oct 2022
ALEXANDER SUSAN H EVP Chief Legal Off & Corp Sec
Sold, plan not stated
$1.55M 5,532 at 280.70
12.3%
7 Jun 2021
Sandrock Alfred Head of Research & Development
Sold, plan not stated
$3.38M 7,672 at 440.00
43.0%
7 Jun 2021
Guindo Chirfi Head of Glob Prod Strat & Com
Sold, plan not stated
$1.36M 3,087 at 440.00
51.4%
Sold half or more
4 Jun 2021
Posner Brian S Director
Sold, plan not stated
$98.70K 360 at 274.17
4.6%
9 Feb 2021
Mantas Jesus B Director
Bought
$239.77K 898 at 267.00
43.9%
First buy on file
30 Nov 2020
Vounatsos Michel Chief Executive Officer
Bought
$748.05K 3,100 at 241.31
9.8%
First buy on file
4 Nov 2020
Sandrock Alfred EVP, Research & Development
Sold, plan not stated
$525.00K 1,500 at 350.00
10.3%
11 Mar 2020
Sold, plan not stated 2×
$718.57K 2,434 at 295.22
14.5%
2 Dec 2019
Posner Brian S Director
Sold, plan not stated
$308.43K 1,055 at 292.35
13.1%
2 May 2019
DENNER ALEXANDER J Director · indirect
Bought
$8.79M 38,000 at 231.24
6.3%
First buy on file
1 May 2019
DENNER ALEXANDER J Director · indirect
Bought
$6.88M 30,000 at 229.46
5.2%
First buy on file
1 May 2019
Vounatsos Michel Chief Executive Officer
Bought
$1.01M 4,351 at 231.48
26.1%
First buy on file
30 Apr 2019
DENNER ALEXANDER J Director · indirect
Bought
$11.54M 50,342 at 229.25
9.6%
First buy on file
18 Mar 2019
PANGIA ROBERT W Director
Sold, plan not stated
$2.01M 6,114 at 328.55
24.8%
1 Feb 2019
DENNER ALEXANDER J Director · indirect
Bought
$2.30M 7,000 at 328.45
1.4%
First buy on file
31 Jan 2019
DENNER ALEXANDER J Director · indirect
Bought
$8.53M 25,800 at 330.52
5.2%
First buy on file
30 Jan 2019
DENNER ALEXANDER J Director · indirect
Bought
$9.75M 30,000 at 324.86
6.5%
First buy on file
26 Sep 2018
Ehlers Michael D EVP, Research and Development
Sold, plan not stated
$350.00K 1,000 at 350.00
18.9%
25 Apr 2018
DENNER ALEXANDER J Director · indirect
Bought
$12.96M 48,000 at 269.91
11.6%
First buy on file
27 Feb 2018
Sandrock Alfred EVP, Chief Medical Officer
Sold, plan not stated
$75.32K 259 at 290.83
3.8%
23 Feb 2018
Sandrock Alfred EVP, Chief Medical Officer
Sold, plan not stated
$266.44K 908 at 293.44
12.2%
20 Feb 2018
Sandrock Alfred EVP, Chief Medical Officer
Sold, plan not stated
$216.96K 743 at 292.00
10.2%
15 Feb 2018
Sandrock Alfred EVP, Chief Medical Officer
Sold, plan not stated
$386.71K 1,294 at 298.85
15.1%
9 Jan 2018
PANGIA ROBERT W Director
Sold, plan not stated
$1.92M 5,832 at 329.65
24.8%
29 Dec 2017
Vounatsos Michel Chief Executive Officer
Bought
$250.03K 780 at 320.55
19.0%
First buy on file
Showing 1–50 of 64. Page 1 of 2 Older →