By CapitalSnitch Research Desk · updated Oct 11, 2026 · data from SEC filings and official Congress disclosures
BIIB insiders were on both sides of the trade this year. Buys came to roughly $585 (one buyer), sales to $905,000 (two sellers).
Murphy Nicole (Officer) made the biggest buy, worth around $585.
Looking at the quarterly pattern: Last full quarter: net selling by insiders. Insiders bought in 2 of the last 7 full quarters. Members of Congress reported 12 trades in BIIB over the past two years (five members). 1,041 investment managers listed BIIB in their latest 13F filings (Q2 2026); more funds bought than sold.
Are insiders buying or selling BIIB stock?
In the last 12 months Biogen Inc. insiders made open-market purchases worth about $585 and sales worth about $905,000. Data comes from SEC Form 4 filings, updated every 30 minutes on CapitalSnitch.
When was the last insider trade in BIIB?
The most recent open-market insider trade in BIIB was filed on 2026-08-05.
How many institutions own BIIB?
1,041 investment managers reported holding BIIB in SEC Form 13F filings for Q2 2026.
Has any member of Congress traded BIIB?
Yes. Members of Congress reported 12 trades in BIIB over the past two years. The full list is free on CapitalSnitch.
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Public-record data for research and education, not investment advice. Insider sales are often pre-planned (10b5-1).
Congress data: Data derived from public disclosures filed under the Ethics in Government Act and the STOCK Act, republished free for public transparency and news reporting. Disclosures may lag the trade by 45 days or more and show amounts only as ranges. This data may not be used for credit rating, loan underwriting, solicitation of money (political, charitable or other), direct-mail or commercial targeting (5 U.S.C. 13107).