0000950135-08-001496 Sample Contracts

Biogen Idec Inc. Underwriting Agreement

Underwriting Agreement • March 4th, 2008 • Biogen Idec Inc. • Biological products, (no disgnostic substances)

• Contract Type
  Underwriting Agreement
• Filed
  March 4th, 2008
• Company
  Biogen Idec Inc.
• Industry
  Biological products, (no disgnostic substances)

Goldman, Sachs & Co. Merrill Lynch & Co. Merrill Lynch, Pierce, Fenner & Smith Incorporated As representatives of the several Underwriters named in Schedule I hereto,

BIOGEN IDEC INC., as Issuer and The Bank of New York Trust Company, N.A., as Trustee First Supplemental Indenture Dated as of March 4, 2008

First Supplemental Indenture • March 4th, 2008 • Biogen Idec Inc. • Biological products, (no disgnostic substances) • New York

• Contract Type
  First Supplemental Indenture
• Filed
  March 4th, 2008
• Company
  Biogen Idec Inc.
• Industry
  Biological products, (no disgnostic substances)
• Jurisdiction
  New York

SUPPLEMENTAL INDENTURE (this “First Supplemental Indenture”), dated as of March 4, 2008, between BIOGEN IDEC INC., a Delaware corporation (the “Company”), and The Bank of New York Trust Company, a national association, as Trustee (the “Trustee”).