Form4insider filings, from the source

Insider · CIK 0001777331

Jesus B Mantas

Files at: BIIB. On EDGAR ↗

1M3M6M1Y2YAll datashares as filed — not split-adjusted

Reported trades — common stock

TradeReported (ET)CompanySharesAvg priceTotalOwned afterΔ stakeFlags
Jun 9, 2026 AForm 4 →Jun 11, 5:44 pm EDTBIOGEN INC.BIIB1,505——11,263—

Reported trades — derivatives (options, RSUs, warrants)

No reported derivative activity in this period.