Biogen Inc. Contracts & Agreements

Letter regarding employment arrangement of Robin Kramer dated October 28, 2024 (Filed With SEC on October 30, 2024)

Credit Agreement, dated as of August 12, 2024, among Biogen Inc., Bank of America, N.A., as administrative agent, swing line lender and the L/C issuer, and the other lenders party... (Filed With SEC on August 14, 2024)

Form of performance share award agreement under the Biogen Inc. 2024 Omnibus Equity Plan (Filed With SEC on August 1, 2024)

Form of restricted stock unit award agreement under the Biogen Inc. 2024 Omnibus Equity Plan (Filed With SEC on August 1, 2024)

Form of restricted stock unit award agreement for non-employee Director's under the Biogen Inc. 2024 Omnibus Equity Plan (Filed With SEC on August 1, 2024)

Description of Securities (Filed With SEC on February 14, 2024)

Letter amending employment arrangement of Susan Alexander dated February 28, 2020 (Filed With SEC on February 14, 2024)

Letter regarding employment arrangement of Rachid Izzar dated August 1, 2019 (Filed With SEC on February 14, 2024)

JVA Termination Agreement, by and among Biogen Therapeutics Inc., Samsung BioLogics Co., Ltd. and Samsung Bioepis Co., Ltd, dated April 20, 2020 (Filed With SEC on February 14, 2024)

Credit Agreement, dated as of August 28, 2023 among Biogen Inc., JPMorgan Chase Bank N.A., as administrative agent and the other lenders party thereto (Filed With SEC on September 1, 2023)

Agreement and Plan of Merger, dated as of July 28, 2023, by and among Biogen Inc., River Acquisition, Inc. and Reata Pharmaceuticals, Inc (Filed With SEC on July 31, 2023)

Voting and Support Agreement, dated as of July 28, 2023, by and among Biogen Inc., River Acquisition, Inc. and each stockholder of Reata Pharmaceuticals, Inc., set forth on... (Filed With SEC on July 31, 2023)

Letter regarding employment arrangement of Ginger Gregory dated June 9, 2017 (Filed With SEC on April 25, 2023)

Letter regarding employment arrangement of Nicole Murphy dated January 28, 2022 (Filed With SEC on April 25, 2023)

Employment Agreement, dated November 10, 2022, by and between Biogen Inc. and Christopher A. Viehbacher (Filed With SEC on November 10, 2022)

Biogen Inc. 2006 Non-Employee Directors Equity Plan, as amended (Filed With SEC on May 3, 2022)

Letter regarding employment arrangement of Michel Vounatsos dated May 2, 2022 (Filed With SEC on May 3, 2022)

Description of Securities (Filed With SEC on February 3, 2022)

Amended and Restated Biogen Inc. 2019 Performance-Based Management Incentive Plan, effective as of June 2, 2021 (Filed With SEC on July 22, 2021)

Joint Venture Agreement, dated December 6, 2011, by and between Samsung BioLogics Co., Ltd. and Biogen Therapeutics Inc. (f/k/a Biogen Idec Therapeutics Inc.), as amended February... (Filed With SEC on April 22, 2021)

Third Supplemental Indenture, dated February 16, 2021, between Biogen Inc. and U.S. Bank National Association (Filed With SEC on February 16, 2021)

Form of 3.250% Senior Notes due 2051, in the form of a Global Note bearing a private placement legend (Filed With SEC on February 16, 2021)

Form of 3.250% Senior Notes due 2051, in the form of a Global Note bearing a Regulation S legend (Filed With SEC on February 16, 2021)

Registration Rights Agreement, dated February 16, 2021, between Biogen Inc. and Deutsche Bank Securities Inc. and Citigroup Global Markets, Inc. with respect to the 3.250% Senior... (Filed With SEC on February 16, 2021)

Second Supplemental Indenture, dated April 30, 2020, between Biogen Inc. and U.S. Bank National Association, including the forms of Global Notes attached as Exhibit A and Exhibit... (Filed With SEC on February 3, 2021)

Letter regarding employment arrangement of Chirfi Guindo dated October 12, 2017 (Filed With SEC on February 3, 2021)

Biogen Inc. Executive Severance Policy - U.S. Executive Vice President, as amended effective July 13, 2020 (Filed With SEC on October 21, 2020)

Letter regarding employment arrangement of Michael McDonnell dated July 16, 2020 (Filed With SEC on October 21, 2020)

Separation Agreement between Biogen Inc. and Jeffrey Capello dated July 16, 2020 (Filed With SEC on October 21, 2020)

Underwriting Agreement, dated April 27, 2020, by and among the Company, Goldman Sachs & Co. LLC, BofA Securities, Inc. and J.P. Morgan Securities LLC, as representatives of the... (Filed With SEC on April 30, 2020)

Second Supplemental Indenture, dated April 30, 2020, between the Company and U.S. Bank National Association, including the forms of Global Notes attached as Exhibit A and Exhibit... (Filed With SEC on April 30, 2020)

Description of Securities (Filed With SEC on February 6, 2020)

Credit Agreement, dated as of January 28, 2020, among Biogen Inc., Bank of America, N.A., as administrative agent, swing line lender and the L/C issuer, and the other lenders... (Filed With SEC on February 3, 2020)

Annual Retainer Summary for Board of Directors (effective as of January 1, 2020) (Filed With SEC on October 22, 2019)

Form of market stock unit award agreement under the Biogen Inc. 2017 Omnibus Equity Plan (for grants commencing in July 2019) (Filed With SEC on July 24, 2019)

Form of performance stock units award agreement under the Biogen Inc. 2017 Omnibus Equity Plan (for grants commencing in July 2019) (Filed With SEC on July 24, 2019)

Form of performance stock units award agreement (cash settled) under the Biogen Inc. 2017 Omnibus Equity Plan (for grants commencing in July 2019) (Filed With SEC on July 24, 2019)

Biogen Inc. Executive Severance Policy - U.S. Executive Vice President, as amended effective June 19, 2019 (Filed With SEC on July 24, 2019)

Biogen Inc. 2019 Form of Performance-Based Management Incentive Plan. Filed as Exhibit 10.1 to our Quarterly Report on Form 10-Q for the quarter ended March 31, 2019 (Filed With SEC on April 24, 2019)

Annual Retainer Summary for Board of Directors (Filed With SEC on February 6, 2019)

Form of performance stock units award agreement under the Biogen Inc. 2017 Omnibus Equity Plan (Filed With SEC on April 24, 2018)

Form of performance stock units award agreement (cash settled) under the Biogen Inc. 2017 Omnibus Equity Plan (Filed With SEC on April 24, 2018)

Form of restricted stock unit award agreement (2018 one-time transition grant) under the Biogen Inc. 2017 Omnibus Equity Plan (Filed With SEC on April 24, 2018)

Letter regarding employment arrangement for Paul McKenzie dated December 14, 2015 (Filed With SEC on April 24, 2018)

Form of performance stock units award agreement (cash-settled) under the Biogen Inc. 2017 Omnibus Equity Plan (Filed With SEC on February 1, 2018)

Form of performance stock units award agreement under the Biogen Inc. 2017 Omnibus Equity Plan (Filed With SEC on February 1, 2018)

Annual Retainer Summary for Board of Directors (Filed With SEC on February 1, 2018)

Letter regarding employment arrangement of Jeffrey Capello dated November 14, 2017 (Filed With SEC on February 1, 2018)

Letter regarding employment arrangement of Gregory Covino dated February 25, 2012 (Filed With SEC on February 1, 2018)

Letter regarding employment arrangement of Michael Ehlers dated April 16, 2016 (Filed With SEC on February 1, 2018)

RESTRICTED STOCK UNIT AWARD AGREEMENT GRANTED UNDER BIOGEN INC. 2017 OMNIBUS EQUITY PLAN (Filed With SEC on July 25, 2017)

MARKET STOCK UNIT AWARD AGREEMENT GRANTED UNDER BIOGEN INC. 2017 OMNIBUS EQUITY PLAN (Filed With SEC on July 25, 2017)

PERFORMANCE UNIT AWARD AGREEMENT GRANTED UNDER BIOGEN INC. 2017 OMNIBUS EQUITY PLAN (Filed With SEC on July 25, 2017)

CASH-SETTLED PERFORMANCE UNITS AWARD AGREEMENT GRANTED UNDER BIOGEN INC. 2017 OMNIBUS EQUITY PLAN (Filed With SEC on July 25, 2017)

SEPARATION AGREEMENT by and between BIOGEN INC. and BIOVERATIV INC. Dated as of January 31, 2017 TABLE OF CONTENTS (Filed With SEC on February 2, 2017)

SETTLEMENT AND LICENSE AGREEMENT among Biogen Swiss Manufacturing GmbH, Biogen International Holding Ltd., Forward Pharma A/S and Each of the Parties Listed on Appendix I Dated as... (Filed With SEC on February 1, 2017)

Biogen Swiss Manufacturing GmbH Biogen International Holding Ltd. c/o Biogen Inc. 225 Binney Street Cambridge, MA 20142 (Filed With SEC on January 17, 2017)

EMPLOYMENT AGREEMENT (Filed With SEC on December 19, 2016)

Exhibit A (Filed With SEC on July 21, 2016)

/s/ Alfred SandrockOctober 20, 2015Alfred SandrockSignature Date New Level24New Bonus Target70% of salaryNew PositionEVP, CMO, Neurology & NeurodegenerationReports... (Filed With SEC on February 3, 2016)

BIOGEN INC. and U.S. BANK NATIONAL ASSOCIATION, as Trustee INDENTURE Debt Securities Dated as of September 15, 2015 CROSS-REFERENCE TABLE (Filed With SEC on September 16, 2015)

BIOGEN INC., as Issuer and U.S. BankNational Association, as Trustee First Supplemental Indenture Dated as of September 15, 2015 TABLE OF CONTENTS (Filed With SEC on September 16, 2015)

Biogen Inc. 2.900%Senior Notes due 2020 3.625% Senior Notes due 2022 4.050% Senior Notes due 2025 5.200% Senior Notes due 2045 Underwriting Agreement (Filed With SEC on September 14, 2015)

CREDIT AGREEMENT Dated as of August 28, 2015 among BIOGEN INC. as the Borrower, BANK OF AMERICA, N.A., as Administrative Agent, Swing Line Lender and an L/C Issuer, GOLDMAN SACHS... (Filed With SEC on September 1, 2015)

BIOGEN INC. 2006 NON-EMPLOYEE DIRECTORS EQUITY PLAN (Approved by stockholders on May 25, 2006; as amended through March 27, 2015) (Filed With SEC on April 24, 2015)

/s/ Adam M KoppelAdam M Koppel2/6/2014SignatureName (Print)Signature Date (Filed With SEC on February 4, 2015)

/s/ Adriana KaraboutisAdriana Karaboutis8/14/2014SignatureName (Print)Signature Date (Filed With SEC on February 4, 2015)

BIOGEN IDEC INC. AMENDED AND RESTATED 2008 OMNIBUS EQUITY PLAN (Filed With SEC on April 23, 2014)

PERFORMANCE UNIT AWARD AGREEMENT GRANTED UNDER BIOGEN IDEC INC. 2008 OMNIBUS EQUITY PLAN (Filed With SEC on April 23, 2014)

MARKET STOCK UNIT AWARD AGREEMENT GRANTED UNDER BIOGEN IDEC INC. 2008 OMNIBUS EQUITY PLAN (Filed With SEC on April 23, 2014)

PERFORMANCE SHARES AWARD AGREEMENT GRANTED UNDER BIOGEN IDEC INC. 2008 OMNIBUS EQUITY PLAN (Filed With SEC on February 6, 2014)

Severance Plan for U.S. Executive Vice Presidents (Filed With SEC on February 6, 2014)

Severance Plan for International Executive Vice Presidents (Filed With SEC on February 6, 2014)

Exhibit A REAFFIRMATION OF RELEASE OF CLAIMS (Filed With SEC on February 6, 2014)

EMPLOYMENT AGREEMENT (as amended effective as of July 15, 2013) (Filed With SEC on August 26, 2013)

/s/ Alfred Sandrock5/10/2013Alfred SandrockSignature Date (Filed With SEC on July 25, 2013)

CREDIT AGREEMENT Dated as of March 14, 2013 among BIOGEN IDEC INC. as the Borrower, BANK OF AMERICA, N.A., as Administrative Agent, Swing Line Lender and L/C Issuer, CREDIT SUISSE... (Filed With SEC on April 25, 2013)

ASSET PURCHASE AGREEMENT by and among ELAN PHARMA INTERNATIONAL LIMITED, ELAN PHARMACEUTICALS, INC. and BIOGEN IDEC INTERNATIONAL HOLDING LTD. Dated as of February 5, 2013 (Filed With SEC on February 12, 2013)

BIOGEN IDEC INC. SUPPLEMENTAL SAVINGS PLAN (Plan Provisions as in Effect on January 1, 2012) TABLE OF CONTENTS (Filed With SEC on February 3, 2012)

BIOGEN IDEC INC. VOLUNTARY BOARD OF DIRECTORS SAVINGS PLAN (Plan Provisions as in Effect on January 1, 2012) TABLE OF CONTENTS (Filed With SEC on February 3, 2012)

EX-101 INSTANCE DOCUMENT (Filed With SEC on October 28, 2011)

EX-101 INSTANCE DOCUMENT (Filed With SEC on July 26, 2011)

Indemnification Agreement (Filed With SEC on June 7, 2011)

EX-101 INSTANCE DOCUMENT (Filed With SEC on April 21, 2011)

EX-101 INSTANCE DOCUMENT (Filed With SEC on February 4, 2011)

EX-101 INSTANCE DOCUMENT (Filed With SEC on July 20, 2010)

EMPLOYMENT AGREEMENT (Filed With SEC on July 1, 2010)

EX-10.1 Form of cash-settled performance shares award agreement under the 2008 Omnibus Equity Plan (Filed With SEC on April 20, 2010)

EX-10.2 Form of market stock unit award agreement under the 2008 Omnibus Equity Plan (Filed With SEC on April 20, 2010)

EX-10.3 Biogen Idec Inc. 2006 Non-Employee Directors Equity Plan, as amended (Filed With SEC on April 20, 2010)

Ex-10.50 Transition Agreement, dated as of January 4, 2010 (Filed With SEC on February 9, 2010)

EX-10.52 Letter regarding employment arrangement of Robert Hamm dated April 1, 2009 (Filed With SEC on February 9, 2010)

Ex-10.58 Letter regarding employment arrangement of Susan Alexander dated December 13, 2005 (Filed With SEC on February 9, 2010)

Ex-10.1 Consulting Agreement between Eidetica Biopharma GmBH and Hans Peter Hasler dated April 30, 2009 (Filed With SEC on July 17, 2009)

Ex-10.2 Director Agreement between Biogen Idec International B.V. and Hans Peter Hasler dated April 30, 2009 (Filed With SEC on July 17, 2009)

Ex-10.3 Annual Retainer Summary for Board of Directors (Filed With SEC on July 17, 2009)

Ex-10.1 Amendment No.1 to Credit Agreement (Filed With SEC on April 17, 2009)

Ex-4.4 Amendment No. 2 to Amended and Restated Rights Agreement between Biogen Idec and Mellon Investor Services LLC dated as of January 22, 2009 (Filed With SEC on February 6, 2009)

Ex-10.19 Amendment to Biogen Idec Inc. 2008 Omnibus Equity Plan dated October 13, 2008 (Filed With SEC on February 6, 2009)

Ex-10.25 Amendment to Biogen Idec Inc. 2006 Non-Employee Directors Equity Plan dated October 13, 2008 (Filed With SEC on February 6, 2009)

Ex-10.30 Amendment to Biogen Idec Inc. 2005 Omnibus Equity Plan dated October 13, 2008 (Filed With SEC on February 6, 2009)

Ex-10.34 Amendment to Biogen Idec Inc. 2003 Omnibus Equity Plan dated October 13, 2008 (Filed With SEC on February 6, 2009)

Ex-10.45 Amendment to Biogen, Inc. 1985 Non-Qualified Stock Option Plan dated October 13, 2008 (Filed With SEC on February 6, 2009)

Ex-10.51 Biogen Idec Inc. Executive Severance Policy - U.S. Executive Vice President, as amended effective October 13, 2008 (Filed With SEC on February 6, 2009)

Ex-10.52 Biogen Idec Inc. Executive Severance Policy - International Executive Vice President, as amended effective October 13, 2008 (Filed With SEC on February 6, 2009)

Ex-10.53 Biogen Idec Inc. Executive Severance Policy - U.S. Senior Vice President, as amended effective October 13, 2008 (Filed With SEC on February 6, 2009)

Ex-10.54 Biogen Idec Inc. Executive severance Policy - International Senior Vice President, as amended effective October 13, 2008 (Filed With SEC on February 6, 2009)

Ex-10.59 Second Amendment to Employment Agreement between Biogen Idec and James C. Mullen dated as of December 4, 2008 (Filed With SEC on February 6, 2009)

Ex-10.61 Employment Agreement between Biogen Idec Management Services GmbH and Hans Peter Hasler dated October 15, 2008 (Filed With SEC on February 6, 2009)

Ex-10.63 First Amendment to Employment Agreement between Biogen Idec and Cecil B. Pickett dated as of October 28, 2008 (Filed With SEC on February 6, 2009)

Ex-10.66 First Amendment to Employment Agreement between Biogen Idec and Craig E. Schneier dated October 8, 2008 (Filed With SEC on February 6, 2009)

AMENDMENT NO. 2 TO AMENDED AND RESTATED RIGHTS AGREEMENT (Filed With SEC on January 16, 2009)

Ex-10.1 Annual Reatainer Summary for Board of Directors (Filed With SEC on October 21, 2008)

EX-10.1 Form of indemnification agreement for directors (Filed With SEC on October 17, 2008)

Ex-10.1 Form of resticted stock unit award agreement (Filed With SEC on August 1, 2008)

Ex-10.2 Form of nonqualified stock option award agreement (Filed With SEC on August 1, 2008)

EX-10.2 Amendment to Biogen, Inc. 1985 Non-Qualified Stock Option Plan dated April 18, 2008 (Filed With SEC on July 22, 2008)

EX-10.3 Amendment to Biogen, Inc. 1987 Scientific Board Stock Option Plan dated April 18, 2008 (Filed With SEC on July 22, 2008)

EX-10.4 Amendment to IDEC Pharmaceuticals Corporation 1988 Stock Option Plan dated April 18, 2008 (Filed With SEC on July 22, 2008)

EX-10.5 Amendment to IDEC Pharmaceuticals Corporation 1993 Non-Employee Directors Stock Option Plan dated April 18, 2008 (Filed With SEC on July 22, 2008)

EX-10.6 Amendment to Biogen Idec Inc. 2003 Omnibus Equity Plan dated April 18, 2008 (Filed With SEC on July 22, 2008)

EX-10.7 Amendment to Biogen Idec Inc. 2005 Omnibus Equity Plan dated April 18, 2008 (Filed With SEC on July 22, 2008)

EX-10.8 Amendment to Biogen Idec Inc. 2006 Non-Employee Directors Equity Plan dated April 18, 2008 (Filed With SEC on July 22, 2008)

Biogen Idec Inc. (Filed With SEC on March 4, 2008)

TABLE OF CONTENTS Page ARTICLE I. DEFINITIONS 1 SECTION 1.1. Certain Terms Defined in the Indenture 1 SECTION 1.2. Definitions 2 ARTICLE II. FORM AND TERMS OF THE NOTES 5 SECTION... (Filed With SEC on March 4, 2008)

Ex-10.22 1985 Non-Qualified Stock Option Plan (Filed With SEC on February 14, 2008)

Ex-10.33 Board of Directors - Annual Retainer Summary Sheet (Filed With SEC on February 14, 2008)

Ex-10.45 Amend. No.1 to 2006 Non-employee Directors Equity Plan (Filed With SEC on February 14, 2008)

Ex-10.49 Letter regarding employement arrangement of Paul J. Clancy (Filed With SEC on February 14, 2008)

Ex-10.50 Letter regarding employement arrangement of Robert Hamm (Filed With SEC on February 14, 2008)

Ex-10.51 Consulting Agreement, dated December 18, 2007 (Filed With SEC on February 14, 2008)

Ex-10.52 Executive Severance Policy - Executive Vice President (Filed With SEC on February 14, 2008)

Ex-10.53 Executive Severance Policy - International Executive Vice President (Filed With SEC on February 14, 2008)

Ex-10.54 Executive Severance Policy - Senior Vice President (Filed With SEC on February 14, 2008)

Ex-10.55 Supplemental Savings Plan as amended and restated (Filed With SEC on February 14, 2008)

Ex-10.56 Voluntary Board of Directors Savings Plan (Filed With SEC on February 14, 2008)

Ex-10.1 Amendment dated April 4, 2006, to 2005 Omnibus Equity Plan (Filed With SEC on May 3, 2007)

Ex-10.2 Amendment dated February 12, 2007, to 2005 Omnibus Equity Plan (Filed With SEC on May 3, 2007)

EX-10.42 - BOARD OF DIRECTORS - ANNUAL RETAINER SUMMARY SHEET (Filed With SEC on February 21, 2007)

EX-10.49 - Proposed Resolution for Meeting of the Board of Directors (Filed With SEC on February 21, 2007)

EX-10.57 Amendment No. 1 to the 2006 Non-Employee Directors Equity Plan (Filed With SEC on February 21, 2007)

Ex-10.1 Letter Agreement regarding employment arrangement of Cecil B. Pickett (Filed With SEC on November 9, 2006)

Ex-10.51 Letter regarding employment arrangement, dated October 4, 2004 (Filed With SEC on March 3, 2006)

Ex-10.52 Letter regarding relocation arrangement, dated September 2, 2004 (Filed With SEC on March 3, 2006)

Ex-10.53 Letter regarding employment arrangement, dated October 8, 2001 (Filed With SEC on March 3, 2006)

Ex-10.54 Memorandum regarding reimbursement arrangement, dated August 28, 2002 (Filed With SEC on March 3, 2006)

EX-10.1 First Amendment to Employment Agreement (Filed With SEC on February 10, 2006)

Ex-10.1 Letter Agreement, dated December 16, 2005 (Filed With SEC on December 22, 2005)

Ex-10.1 Form of Grant Notice (Restricted Stock Units) (Filed With SEC on September 15, 2005)

Ex-10.1 Purchase and Sale Agreement and Joint Escrow Instructions (Filed With SEC on July 27, 2005)

Ex-10.1 Amendment to 2003 Omnibus Equity Plan (Filed With SEC on April 29, 2005)

Ex-10.2 2005 Cash Bonus Plan (Filed With SEC on April 29, 2005)

EX-10.25 LEASE DATED APRIL 1, 1990 (Filed With SEC on March 31, 2005)

EX-10.42 BOARD OF DIRECTORS - ANNUAL RETAINER SUMMARY SHEET (Filed With SEC on March 31, 2005)

EX-10.1 Letter agreement dated as of January 5, 2005 (Filed With SEC on January 6, 2005)

EX-10.1 LEASE AGREEMENT DATED SEPTEMBER 24, 2004 (Filed With SEC on September 29, 2004)

EX-10.1 AMENDMENT TO 1998 STOCK PLAN (Filed With SEC on August 9, 2004)

EX-10.2 AMENDMENT TO SEVERANCE POLICY (Filed With SEC on August 9, 2004)

EX-4.2 SPECIMEN COMMON STOCK CERTIFICATE (Filed With SEC on March 10, 2004)

EX-10.13 VOLUNTARY EXECUTIVE SUP. SAVINGS PLAN (Filed With SEC on March 10, 2004)

EX-10.28 VOLUNTARY BOARD OF DIR SAVINGS PLAN (Filed With SEC on March 10, 2004)

EX-10.29 EXECUTIVE SEVERANCE POLICY (Filed With SEC on March 10, 2004)

EX-10.34 FOURTH AMENDMENT TO AGREEMENT (Filed With SEC on March 10, 2004)

EX-10.35 FIFTH AMENDMENT TO AGREEMENT (Filed With SEC on March 10, 2004)

EX-10.36 FIRST AMENDMENT TO LEASE DATED 10-1-1999 (Filed With SEC on March 10, 2004)

EX-10.37 SECOND AMENDMENT TO LEASE DATED 6-16-2000 (Filed With SEC on March 10, 2004)

EX-10.38 THIRD AMENDMENT TO LEASE DATED 10-13-2000 (Filed With SEC on March 10, 2004)

EX-10.39 FIRST AMENDMENT TO LEASE DATED 11-9-1992 (Filed With SEC on March 10, 2004)

EX-10.40 LEASE AMENDMENT DATED 12-30-1994 (Filed With SEC on March 10, 2004)

EX-10.41 LEASE AGREEMENT (Filed With SEC on March 10, 2004)

EX-10.42 FIRST AMENDMENT TO LEASE DATED 9-12-2000 (Filed With SEC on March 10, 2004)

EX-10.43 SECOND AMENDMENT TO LEASE DATED 11-1-2000 (Filed With SEC on March 10, 2004)

EX-10.44 SINGLE-TENANT FULLY-NET LEASE AGREEMENT (Filed With SEC on March 10, 2004)

EX-10.45 FORM OF LETTER AGREEMENT (Filed With SEC on March 10, 2004)

Ex-2.1 Agreement and Plan of Merger (Filed With SEC on June 23, 2003)

Ex-4.1 Second Agreement and Amendment to Rights (Filed With SEC on June 23, 2003)

Ex-10.20 1982 Incentive Stock Option Plan (Filed With SEC on March 14, 2003)

Ex-10.21 1985 Non-Qualified Stock Option Plan (Filed With SEC on March 14, 2003)

Ex-10.22 1987 Scientific Board Stock Option Plan (Filed With SEC on March 14, 2003)

Ex 10.44 Letter agreement - Thomas Bucknum 6/11/99 (Filed With SEC on March 14, 2003)

Ex 10.45 Letter agreement - T. Bucknum 10/19/01 (Filed With SEC on March 14, 2003)

Ex 10.48 Antegren Development and Marketing Coll (Filed With SEC on March 14, 2003)

Ex 10.49 Letter agreement - J. Mullen 2/15/02 (Filed With SEC on March 14, 2003)

Ex 10.50 Letter agreement - J. Mullen 3/06/03 (Filed With SEC on March 14, 2003)

Ex 10.51 Letter agreement - H. P. Hasler 6/22/01 (Filed With SEC on March 14, 2003)

Ex 10.52 Letter agreement - H. P. Hasler 10/19/01 (Filed With SEC on March 14, 2003)

EX-10.1 Letter Agreement w/ J.L. Vincent, 7/15/02 (Filed With SEC on October 18, 2002)

EX-10.2 Letter Agreement re: J.L. Vincent, 7/15/02 (Filed With SEC on October 18, 2002)

EX-10.1 1985 Non-Qualified Stock Option Plan (Filed With SEC on August 14, 2002)

EX-10.2 Agreement & Amendment to Rights Agreement (Filed With SEC on August 14, 2002)

Ex-10.20 1983 Employee Stock Purchase Plan (Filed With SEC on March 29, 2002)

Ex-10.23 1987 Scientific Board Stock Option Plan (Filed With SEC on March 29, 2002)

Ex-10.24 Voluntary Executive Supplemental Savings (Filed With SEC on March 29, 2002)

Ex-10.27 Voluntary Board of Directors Savings Plan (Filed With SEC on March 29, 2002)

Ex-10.42 Letter agreement regarding Peter Kellogg (Filed With SEC on March 29, 2002)

Ex-10.43 Letter agreement amending ... Kellogg (Filed With SEC on March 29, 2002)

Ex-10.44 Letter agreement amending ... Adelman (Filed With SEC on March 29, 2002)

Ex-10.45 Renewal of Independent Consulting Agmnt (Filed With SEC on March 29, 2002)

Ex-10.46 Biogen Savings Plan, as amended (Filed With SEC on March 29, 2002)

Ex-10.47 Executive Severance (Filed With SEC on March 29, 2002)

Ex-10.48 Letter agreement dated May 19, 1998 (Filed With SEC on March 29, 2002)

Ex-10.49 Letter agreement dated August 8, 2001 (Filed With SEC on March 29, 2002)

Ex-10.50 Letter agreement dated October 19, 2001 (Filed With SEC on March 29, 2002)

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Biogen Inc. Contracts & Agreements