Form DEFA14A - Additional definitive proxy soliciting materials and Rule 14(a)(12) material:
SEC Accession No. 0001193125-26-187383
Filing Date
2026-04-28
Accepted
2026-04-28 16:42:53
Documents
3

Document Format Files

Seq Description Document Type Size
1 DEFA14A d788083ddefa14a.htm DEFA14A 10865
2 GRAPHIC g788083g00a41.jpg GRAPHIC 330974
3 GRAPHIC g788083g00a42.jpg GRAPHIC 281979
  Complete submission text file 0001193125-26-187383.txt   856709
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.: 26908686
SIC: 2836 Biological Products, (No Diagnostic Substances)
(CF Office: 03 Life Sciences)