Keeney Adam 4

What Happened

• Adam Keeney, Head of Corporate Development at Biogen (BIIB), had 939 restricted stock units (RSUs) convert to 939 common shares on May 1, 2026. The company withheld 455 of those shares to cover tax obligations at a per-share value of $187.06, totaling $85,112. The vesting resulted in a gross value of about $175,649 and a net increase of 484 shares to Keeney’s holdings.
• This was an award/vesting event (not an open-market purchase or a sale). The withholding is a routine tax-satisfaction disposition, not an indication of a market trade decision.

Key Details

• Transaction date: 2026-05-01; Form 4 filed 2026-05-05 (timely filing).
• Vesting/conversion: 939 RSUs converted into 939 shares (transaction code M).
• Tax withholding: 455 shares withheld/disposed at $187.06 each for $85,112 (transaction code F).
• Net shares received: 484 (939 vested - 455 withheld).
• Shares owned after transaction: not specified in the provided filing excerpt.
• Footnote: RSUs vest in three equal yearly installments beginning May 1, 2023 (so this reflects the scheduled installment vesting).

Context

• This was a standard RSU vesting event. The M codes reflect conversion of restricted stock units into common shares; the F code shows shares were surrendered to satisfy tax withholding. Such vesting/withholding is routine compensation administration and does not by itself signal insider buying or selling intention.