BIOGEN INC.

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

Annual report pursuant to Section 13 or 15(d)

Results of Operations and Financial Condition

Results of Operations and Financial Condition

General form for quarterly reports under Section 13 or 15(d)

Results of Operations and Financial Condition

Results of Operations and Financial Condition

General form for quarterly reports under Section 13 or 15(d)

Results of Operations and Financial Condition

No description available

No description available

No description available

No description available

Results of Operations and Financial Condition

Submission of Matters to a Vote of Security Holders

Additional Information for Proxy Statement/ Votes

Other Events

Prospectus Supplement for Delayed or Continuous Offering

Prospectus Supplement for Delayed or Continuous Offering

Free Writing Prospectus

General form for quarterly reports under Section 13 or 15(d)

Results of Operations and Financial Condition

Automatic Shelf Registration

Annual Report Scanned (Paper)

Definitive Proxy Statement

Additional Information for Proxy Statement/ Votes

Annual report pursuant to Section 13 or 15(d)

Results of Operations and Financial Condition

5.02

No description available

No description available

General form for quarterly reports under Section 13 or 15(d)

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

Results of Operations and Financial Condition

5.02

1.01,1.02,2.03,9.01

General form for quarterly reports under Section 13 or 15(d)

2.02,9.01

5.03,5.07,9.01

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Annual Report Scanned (Paper)

Definitive Proxy Statement

Additional Information for Proxy Statement/ Votes

General form for quarterly reports under Section 13 or 15(d)

2.02,9.01

Preliminary Proxy Statement

Annual report pursuant to Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

Additional Information for Proxy Statement/ Votes

Additional Information for Proxy Statement/ Votes

General form for quarterly reports under Section 13 or 15(d)

Additional Information for Proxy Statement/ Votes

Required Information in Proxy Statement

Additional Information for Proxy Statement/ Votes

Annual Report Scanned (Paper)

Additional Information for Proxy Statement/ Votes

Definitive Proxy Statement

General form for quarterly reports under Section 13 or 15(d)

Annual report pursuant to Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

Notice of Effectiveness

No description available

Additional Information for Proxy Statement/ Votes

Notice of Effectiveness

Prospectus Supplement for Primary Offering

Correspondence with the SEC

Letter from the SEC

Registration statement under Securities Act of 1933

General form for quarterly reports under Section 13 or 15(d)

Additional Information for Proxy Statement/ Votes

Definitive Proxy Statement

Annual report pursuant to Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

Letter from the SEC

Correspondence with the SEC

Letter from the SEC

Correspondence with the SEC

Shareholder Letter

Letter from the SEC

Definitive Proxy Statement

Additional Information for Proxy Statement/ Votes

General form for quarterly reports under Section 13 or 15(d)

Additional Information for Proxy Statement/ Votes

Correspondence with the SEC

Letter from the SEC

Prospectus Supplement for Delayed or Continuous Offering

Free Writing Prospectus

Prospectus Supplement for Delayed or Continuous Offering

Automatic Shelf Registration

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Prospectus Supplement for Delayed or Continuous Offering

Free Writing Prospectus

Prospectus Supplement for Delayed or Continuous Offering

Automatic Shelf Registration

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

No description available

ALEXANDER SUSAN H

Viehbacher Christopher

Singhal Priya

Murphy Nicole

Gregory Ginger

Kramer Robin

Grogan Jane

Izzar Rachid

Godbout Sean

Keeney Adam

Grogan Jane

Keeney Adam

Izzar Rachid

Kramer Robin

Murphy Nicole

Singhal Priya

Viehbacher Christopher

Gregory Ginger

Godbout Sean

ALEXANDER SUSAN H