BIIB
+$0
1,505 sh
BIIB
BIOGEN INC.
SEC CIK 875045
$199.96
+13.1% · 90 days
90-day buys
$0
0 open-market
90-day sells
$0
0 open-market
Net insider flow
+$0
Net buying
Filings shown
36
Most recent
Insider transaction history
Form 4 filings for BIIB, newest firstBIIB
+$0
1,505 sh
BIIB
+$0
1,505 sh
BIIB
+$0
1,505 sh
BIIB
+$0
1,505 sh
BIIB
+$0
1,505 sh
BIIB
+$0
2,370 sh
BIIB
+$0
1,505 sh
BIIB
+$0
1,505 sh
BIIB
+$0
2,005 sh
BIIB
+$0
939 sh
BIIB
−$85.1K
455 sh @ $187
BIIB
+$0
181 sh
BIIB
−$9.9K
54 sh @ $184
BIIB
+$585
3 sh @ $195
BIIB
−$531.5K
2,660 sh @ $200
BIIB
+$0
9,008 sh
BIIB
−$876.3K
4,356 sh @ $201
BIIB
+$0
15,453 sh
BIIB
−$1.33M
6,624 sh @ $201
BIIB
+$0
2,217 sh
BIIB
−$212.4K
1,056 sh @ $201
BIIB
+$0
4,683 sh
BIIB
−$284.1K
1,412 sh @ $201
BIIB
+$0
2,102 sh
BIIB
−$204.6K
1,017 sh @ $201
BIIB
+$0
1,940 sh
BIIB
−$183.9K
914 sh @ $201
BIIB
+$0
4,683 sh
BIIB
−$283.3K
1,408 sh @ $201
BIIB
+$0
789 sh
BIIB
−$54.9K
273 sh @ $201
BIIB
+$0
703 sh
BIIB
−$41.6K
207 sh @ $201
BIIB
+$0
3,511 sh
BIIB
−$213.9K
1,063 sh @ $201
About BIIB insider activity
This page tracks every recent Form 4 filed for BIOGEN INC. with the U.S. Securities and Exchange Commission. Form 4 is the disclosure that company insiders — officers, directors, and holders of more than 10% of the stock — must file within two business days of buying or selling shares.
The summary above nets open-market purchases against open-market sales over the trailing 90 days. Open-market trades (codes P and S) tend to carry the most signal because they reflect a deliberate choice to put money in or take it out, as opposed to routine grants, option exercises, or tax-withholding events. Use the badges on each row to tell them apart, and always confirm details against the original filing before drawing conclusions.
Frequently asked questions
How often is BIIB insider data updated?
Continuously. We read from SEC EDGAR, so new Form 4 filings for BIOGEN INC. usually appear here within minutes of being accepted by the SEC.
What does "net insider flow" mean?
It is the total dollar value of open-market insider purchases minus open-market sales over the last 90 days. A positive number (green) means insiders bought more than they sold; a negative number (red) means the reverse.
Why do some rows show grants or option exercises instead of buys?
Insiders receive stock through compensation as well as buying it outright. Form 4 captures all of these. We label each transaction by its SEC code so you can focus on open-market activity if you prefer.
Is this investment advice?
No. InsiderSource presents public filing data for informational purposes only. Insider activity is one of many factors to consider and is never a recommendation to buy or sell.