Susan H. Alexander - 06 Feb 2026 Form 4 Insider Report for BIOGEN INC. (BIIB)

Role
EVP Chief Legal Officer
Signature
/s/ Wendell Taylor, attorney-in-fact for Susan Alexander
Issuer symbol
BIIB
Transactions as of
06 Feb 2026
Net transactions value
-$704,935
Form type
4
Filing time
10 Feb 2026, 16:55:45 UTC
Previous filing
12 Feb 2025
Next filing
17 Feb 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
ALEXANDER SUSAN H EVP Chief Legal Officer BIOGEN INC., 225 BINNEY STREET, CAMBRIDGE /s/ Wendell Taylor, attorney-in-fact for Susan Alexander 10 Feb 2026 0001263839

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction BIIB Common Stock Options Exercise $0 +2,190 +6% $0.000000 38,455 06 Feb 2026 Direct
transaction BIIB Common Stock Tax liability $213,050 -1,059 -2.8% $201.18 37,396 06 Feb 2026 Direct
transaction BIIB Common Stock Options Exercise $0 +1,940 +5.2% $0.000000 39,336 06 Feb 2026 Direct
transaction BIIB Common Stock Tax liability $187,299 -931 -2.4% $201.18 38,405 06 Feb 2026 Direct
transaction BIIB Common Stock Options Exercise $0 +4,916 +13% $0.000000 43,321 06 Feb 2026 Direct
transaction BIIB Common Stock Tax liability $304,587 -1,514 -3.5% $201.18 41,807 06 Feb 2026 Direct
holding BIIB Common Stock 20,082 06 Feb 2026 Susan H. Alexander 2021 Irrevocable Trust

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 -2,190 -100% $0.000000 0 06 Feb 2026 Common Stock 2,190 $0.000000 Direct F1
transaction BIIB Restricted Stock Unit Options Exercise $0 -1,940 -50% $0.000000 1,940 06 Feb 2026 Common Stock 1,940 $0.000000 Direct F2
transaction BIIB Restricted Stock Unit Options Exercise $0 -4,916 -33% $0.000000 9,834 06 Feb 2026 Common Stock 4,916 $0.000000 Direct F3
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 The restricted stock units vest in three (3) equal annual installments commencing one year after the grant date of 2/8/2023.
F2 The restricted stock units vest in three (3) equal annual installments, commencing one year after the grant date of 02/07/2024.
F3 The restricted stock units vest in three equal yearly installments beginning on the first anniversary of the grant date of February 6, 2025.