# Filing Detail

Form DEFA14A - Additional definitive proxy soliciting materials and Rule 14(a)(12) material:
SEC Accession No. 0001193125-25-097749
Filing Date
2025-04-28
Accepted
2025-04-25 21:40:28
Documents
3

Document Format Files

Seq | Description | Document | Type | Size
--- | --- | --- | --- | ---
1 | DEFA14A | d916837ddefa14a.htm | DEFA14A | 3803
2 | GRAPHIC | g916837dsp028.jpg | GRAPHIC | 329870
3 | GRAPHIC | g916837dsp029.jpg | GRAPHIC | 291392
| Complete submission text file | 0001193125-25-097749.txt |  | 861089

Mailing Address 225 BINNEY STREET CAMBRIDGE MA 02142
Business Address 225 BINNEY STREET CAMBRIDGE MA 02142 7814642000
BIOGEN INC. (Filer) CIK: 0000875045 (see all company filings)

EIN.: 330112644 | State of Incorp.: DE | Fiscal Year End: 1231
Type: DEFA14A | Act: 34 | File No.: 000-19311 | Film No.: 25875785
SIC: 2836 Biological Products, (No Diagnostic Substances)
(CF Office: 03 Life Sciences)