Rachid Izzar - 06 Feb 2026 Form 4 Insider Report for BIOGEN INC. (BIIB)

Role
Head of Global Product Strat.
Signature
/s/ Wendell Taylor, attorney-in-fact for Rachid Izzar
Issuer symbol
BIIB
Transactions as of
06 Feb 2026
Net transactions value
-$410,005
Form type
4
Filing time
10 Feb 2026, 17:00:19 UTC
Previous filing
16 Jul 2025
Next filing
17 Feb 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Izzar Rachid Head of Global Product Strat. 225 BINNEY STREET, CAMBRIDGE /s/ Wendell Taylor, attorney-in-fact for Rachid Izzar 10 Feb 2026 0001875506

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction BIIB Common Stock Options Exercise $0 +2,044 +33% $0.000000 8,204 06 Feb 2026 Direct F1
transaction BIIB Common Stock Tax liability $161,950 -805 -9.8% $201.18 7,399 06 Feb 2026 Direct
transaction BIIB Common Stock Options Exercise $0 +1,802 +24% $0.000000 9,201 06 Feb 2026 Direct
transaction BIIB Common Stock Tax liability $92,140 -458 -5% $201.18 8,743 06 Feb 2026 Direct
transaction BIIB Common Stock Options Exercise $0 +3,043 +35% $0.000000 11,786 06 Feb 2026 Direct
transaction BIIB Common Stock Tax liability $155,914 -775 -6.6% $201.18 11,011 06 Feb 2026 Direct

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction BIIB Restricted Stock Unit Options Exercise $0 -2,044 -100% $0.000000 0 06 Feb 2026 Common Stock 2,044 $0.000000 Direct F2
transaction BIIB Restricted Stock Unit Options Exercise $0 -1,802 -50% $0.000000 1,802 06 Feb 2026 Common Stock 1,802 $0.000000 Direct F3
transaction BIIB Restricted Stock Unit Options Exercise $0 -3,043 -33% $0.000000 6,087 06 Feb 2026 Common Stock 3,043 $0.000000 Direct F4
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Total adjusted to reflect transfer of shares to the reporting person's former spouse pursuant to a Domestic Relations Order.
F2 The restricted stock units vest in three (3) equal annual installments commencing one year after the grant date of 02/08/2023.
F3 The restricted stock units vest in three (3) equal annual installments, commencing one year after the grant date of 02/07/2024.
F4 The restricted stock units vest in three equal yearly installments beginning on the first anniversary of the grant date of February 6, 2025.