Biogen Inc.

BIIB·NASDAQ·$193.08Share Price as of 11/2·$29BMarket Cap as of 11/2

Financials

10-QQ3 ended 09/30/2610/28/26 10-QQ2 ended 06/30/2607/29/26 10-QQ1 ended 03/31/2604/29/26 10-KFY 202502/06/26 10-QQ3 ended 09/30/2510/30/25

Disclosures

8-KCurrent report10/28/26 8-KResults of Operations07/29/26 8-KResults of Operations07/01/26 8-KCurrent report06/10/26 8-K/ACurrent report (amended)06/10/26

Prospectuses and Registrations

424B2Prospectus for primary offering05/08/25 424B2Prospectus for primary offering05/06/25 FWPFree writing prospectus05/06/25 S-3ASRAutomatic shelf registration05/01/25 S-8Registration of securities for employees06/20/24

Proxies

DEF 14ADefinitive proxy04/28/26 DEFA14AAdditional proxy materials04/28/26 DEFA14AAdditional proxy materials06/02/25 DEF 14ADefinitive proxy04/28/25 DEFA14AAdditional proxy materials04/28/25

Ownership

Form 4Insider transaction10/05/26 Form 4Insider transaction09/03/26 Form 3Initial insider ownership08/12/26 SC 13G/ABeneficial ownership (amended)08/06/26 Form 4Insider transaction08/05/26

Other

SC TO-T/ASC TO-T/A05/14/26 SC TO-T/ASC TO-T/A05/06/26 ARSAnnual report to shareholders04/28/26 ARSAnnual report to shareholders04/28/25 ARSAnnual report to shareholders04/26/24