Keeney Adam 4

What Happened
Adam Keeney, Head of Corporate Development at Biogen (BIIB), had restricted stock units convert into 5,080 common shares on 2026-02-06. Of those, 1,583 shares were withheld to cover tax withholding obligations at a withholding price of $201.18 per share, resulting in proceeds/withholding value of $318,468. The conversion shows an exercise/conversion price of $0.00 (typical for RSUs), meaning no cash exercise price was paid.

Key Details

• Transaction date: 2026-02-06; Form filed 2026-02-10 (timely — within two business days).
• Conversion (code M): 1,802 and 3,278 RSU conversions into 5,080 shares in total at $0.00.
• Tax withholding (code F): 589 shares withheld at $201.18 ($118,495) and 994 shares withheld at $201.18 ($199,973); total withheld value $318,468 for 1,583 shares.
• Net new shares retained by insider: 5,080 − 1,583 = 3,497 shares.
• Footnotes: F1 and F2 indicate the RSUs vest in equal annual installments (grants dated 02/07/2024 and 02/06/2025 respectively).
• Filing did not disclose total shares owned by the insider after the transaction in the provided summary.

Context
These entries reflect routine RSU vesting and company tax-withholding (not an open-market sale). Code M denotes conversion/exercise of a derivative (here RSUs converting to shares) and code F denotes shares surrendered/withheld to satisfy tax obligations. Such withholding is administrative and does not necessarily signal buying or selling intent in the market.