Biogen Inc. Watch

Other Revised 12/03/24 Biogen Inc. Presents at 7th Annual Evercore ISI HealthCONx Healthcare Conference, Dec-03-2024 09:10 AM 12/03/24 Earnings Revised 10/30/24 Biogen Inc., Q3 2024 Earnings Call, Oct 30, 2024 10/30/24 Other Revised 09/18/24 Biogen Inc. Presents at 2024 Cantor Fitzgerald Global Healthcare Conference, Sep-18-2024 01:20 PM 09/18/24 Other Revised 09/04/24 Biogen Inc. Presents at Morgan Stanley 22nd Annual Global Healthcare Conference, Sep-04-2024 10:00 AM 09/04/24 Earnings Revised 08/01/24 Biogen Inc., Q2 2024 Earnings Call, Aug 01, 2024 08/01/24 Other Revised 06/12/24 Biogen Inc. Presents at Goldman Sachs 45th Annual Global Healthcare Conference, Jun-12-2024 10:40 AM 06/12/24 Other Revised 06/05/24 Biogen Inc. Presents at Jefferies 2024 Global Healthcare Conference, Jun-05-2024 12:30 PM 06/05/24 Earnings Revised 04/24/24 Biogen Inc., Q1 2024 Earnings Call, Apr 24, 2024 04/24/24 Other Revised 03/19/24 Biogen Inc. Presents at Stifel Virtual 2024 CNS Day, Mar-19-2024 10:00 AM 03/19/24 Other Revised 03/04/24 Biogen Inc. Presents at TD Cowen 44th Annual Health Care Conference 2024, Mar-04-2024 11:10 AM 03/04/24 Earnings Revised 02/13/24 Biogen Inc., Q4 2023 Earnings Call, Feb 13, 2024 02/13/24 Other Revised 01/08/24 Biogen Inc. Presents at J.P. Morgan 42nd Annual Healthcare Conference 2024, Jan-08-2024 11:15 AM 01/08/24

Other Revised 11/28/23 Biogen Inc. Presents at The 6th Annual Evercore ISI HealthCONx Conference, Nov-28-2023 09:10 AM 11/28/23 Earnings Revised 11/08/23 Biogen Inc., Q3 2023 Earnings Call, Nov 08, 2023 11/08/23 Other Revised 09/26/23 Biogen Inc. Presents at Financial Times: Decentralised Clinical Trials in Focus, Sep-26-2023 02:00 PM 09/26/23 Other Revised 09/11/23 Biogen Inc. Presents at Morgan Stanley 21st Annual Global Healthcare Conference 2023, Sep-11-2023 10:40 AM 09/11/23 Earnings Revised 07/25/23 Biogen Inc., Q2 2023 Earnings Call, Jul 25, 2023 07/25/23 Earnings Revised 04/25/23 Biogen Inc., Q1 2023 Earnings Call, Apr 25, 2023 04/25/23 Other Revised 03/28/23 Biogen Inc. Presents at Stifel 2023 Virtual CNS Days, Mar-28-2023 09:15 AM 03/28/23 Other Revised 03/06/23 Biogen Inc. Presents at Cowen 43rd Annual Healthcare Conference, Mar-06-2023 09:50 AM 03/06/23 Earnings Revised 02/15/23 Biogen Inc., Q4 2022 Earnings Call, Feb 15, 2023 02/15/23 Other Revised 01/09/23 Biogen Inc. Presents at 41st Annual J.P. Morgan Healthcare Conference, Jan-09-2023 11:15 AM 01/09/23

Other Revised 12/06/22 Biogen Inc., Sage Therapeutics, Inc. - Special Call 12/06/22 Other Revised 12/01/22 Biogen Inc. Presents at 5th Annual Evercore ISI HealthCONx Conference 2022, Dec-01-2022 10:30 AM 12/01/22 Earnings Revised 10/25/22 Biogen Inc., Q3 2022 Earnings Call, Oct 25, 2022 10/25/22 Other Revised 09/12/22 Biogen Inc. Presents at Morgan Stanley 20th Annual Global Healthcare Conference, Sep-12-2022 09:55 AM 09/12/22 Earnings Revised 07/20/22 Biogen Inc., Q2 2022 Earnings Call, Jul 20, 2022 07/20/22 Earnings Revised 05/03/22 Biogen Inc., Q1 2022 Earnings Call, May 03, 2022 05/03/22 Other Revised 03/28/22 Biogen Inc. Presents at Stifel CNS Days, Mar-28-2022 10:15 AM 03/28/22 Other Revised 03/07/22 Biogen Inc. Presents at 42nd Annual Cowen Health Care Conference, Mar-07-2022 09:50 AM 03/07/22 Earnings Revised 02/03/22 Biogen Inc., Q4 2021 Earnings Call, Feb 03, 2022 02/03/22 Other Revised 01/13/22 Biogen Inc. - Shareholder/Analyst Call 01/13/22 Other Revised 01/10/22 Biogen Inc. Presents at JPMorgan 40th Annual Healthcare Conference, Jan-10-2022 09:45 AM 01/10/22

Other Revised 11/11/21 Biogen Inc. - Special Call 11/11/21 Earnings Revised 10/20/21 Biogen Inc., Q3 2021 Earnings Call, Oct 20, 2021 10/20/21 Other Revised 10/17/21 Biogen Inc. Presents at The Annual Meeting of the American Neurological Association, Oct-17-2021 04:20 PM 10/17/21 Other Revised 09/21/21 Biogen Inc. - Analyst/Investor Day 09/21/21 Other Revised 09/09/21 Biogen Inc. Presents at Morgan Stanley 19th Annual Global Healthcare Conference, Sep-09-2021 09:30 AM 09/09/21 Earnings Revised 07/22/21 Biogen Inc., Q2 2021 Earnings Call, Jul 22, 2021 07/22/21 Other Revised 06/29/21 Biogen Inc. Presents at SVB Leerink ’s 3rd Annual CNS Forum, Jun-29-2021 01:50 PM 06/29/21 Other Revised 06/08/21 Biogen Inc. - Special Call 06/08/21 Other Revised 06/02/21 Biogen Inc. - Shareholder/Analyst Call 06/02/21 Earnings Revised 04/22/21 Biogen Inc., Q1 2021 Earnings Call, Apr 22, 2021 04/22/21 Other Revised 03/31/21 Biogen Inc. Presents at Stifel's 3rd Annual CNS Day, Mar-31-2021 12:00 PM 03/31/21 Other Revised 03/13/21 Biogen Inc. - Special Call 03/13/21 Other Revised 03/13/21 Biogen Inc. - Pre Recorded Special Call 03/13/21 Other Revised 03/10/21 Biogen Inc. - Special Call 03/10/21 Other Revised 03/09/21 Biogen Inc. Presents at 15th International Conference on Alzheimer’s and Parkinson’s Diseases, Mar-09-2021 through Mar-14-2021 03/09/21 Other Revised 03/01/21 Biogen Inc. Presents at Cowen 41st Annual Health Care Conference, Mar-01-2021 10:20 AM 03/01/21 Other Revised 02/23/21 Biogen Inc. - Special Call 02/23/21 Earnings Revised 02/03/21 Biogen Inc., Q4 2020 Earnings Call, Feb 03, 2021 02/03/21 Other Revised 01/14/21 Biogen Inc. - Special Call 01/14/21 Other Revised 01/11/21 Biogen Inc. Presents at 39th Annual JPMorgan Virtual Healthcare Conference, Jan-11-2021 07:00 AM 01/11/21

Other Revised 11/30/20 Biogen Inc. - Special Call 11/30/20 Other Revised 11/04/20 Biogen Inc. - Special Call 11/04/20 Earnings Revised 10/21/20 Biogen Inc., Q3 2020 Earnings Call, Oct 21, 2020 10/21/20 Other Revised 09/23/20 Biogen Inc. - Special Call 09/23/20 Other Revised 09/14/20 Biogen Inc. Presents at Morgan Stanley 18th Annual Global Healthcare Conference, Sep-14-2020 10:30 AM 09/14/20 Other Revised 07/29/20 Biogen Inc. Presents at Alzheimer's Association International Conference 2020, Jul-29-2020 08:00 AM 07/29/20 Earnings Revised 07/22/20 Biogen Inc., Q2 2020 Earnings Call, Jul 22, 2020 07/22/20 Other Revised 06/23/20 Biogen Inc. Presents at SVB Leerink CybeRx Series: 2nd Annual CNS Forum, Jun-23-2020 12:30 PM 06/23/20 Other Revised 06/03/20 Biogen Inc. - Shareholder/Analyst Call 06/03/20 Other Revised 05/18/20 Biogen Inc. - Special Call 05/18/20 Earnings Revised 10/17/24 Biogen Inc., Q1 2020 Earnings Call, Apr 22, 2020 04/22/20 Other Revised 04/02/20 Biogen Inc. - Special Call 04/02/20 Other Revised 03/02/20 Biogen Inc. Presents at Cowen and Company 40th Annual Health Care Conference, Mar-02-2020 11:20 AM 03/02/20 Earnings Revised 01/30/20 Biogen Inc., Q4 2019 Earnings Call, Jan 30, 2020 01/30/20 Other Revised 01/13/20 Biogen Inc. Presents at 38th Annual J.P Morgan Healthcare Conference, Jan-13-2020 through Jan-16-2020 01/13/20

Other Revised 12/05/19 Biogen Inc. - Special Call 12/05/19 Other Revised 12/05/19 Biogen Inc. - Special Call 12/05/19 Other Revised 12/03/19 Biogen Inc. Presents at Evercore ISI 2nd Annual HealthCONx Conference, Dec-03-2019 11:45 AM 12/03/19 Earnings Revised 10/22/19 Biogen Inc., Q3 2019 Earnings Call, Oct 22, 2019 10/22/19 Other Revised 09/09/19 Biogen Inc. Presents at Morgan Stanley 17th Annual Global Healthcare Conference, Sep-09-2019 09:55 AM 09/09/19 Earnings Revised 07/23/19 Biogen Inc., Q2 2019 Earnings Call, Jul 23, 2019 07/23/19 Other Revised 06/19/19 Biogen Inc. - Shareholder/Analyst Call 06/19/19 Other Revised 06/05/19 Biogen Inc. - Special Call 06/05/19 Other Revised 05/30/19 Biogen Inc. Presents at Bernstein's 35th Annual Strategic Decisions Conference, May-30-2019 10:00 AM 05/30/19 Earnings Revised 04/24/19 Biogen Inc., Q1 2019 Earnings Call, Apr 24, 2019 04/24/19 Other Revised 03/11/19 Biogen Inc. Presents at 39th Annual Cowen Health Care Conference, Mar-11-2019 11:20 AM 03/11/19 Other Revised 03/04/19 Biogen Inc., Nightstar Therapeutics plc - M&A Call 03/04/19 Earnings Revised 01/29/19 Biogen Inc., Q4 2018 Earnings Call, Jan 29, 2019 01/29/19 Other Revised 01/07/19 Biogen Inc. Presents at JP Morgan 37th Annual Healthcare conference, Jan-07-2019 through Jan-10-2019 01/07/19

Other Revised 12/12/18 Biogen Inc. - Special Call 12/12/18 Other Revised 11/28/18 Biogen Inc. Presents at Evercore HEALTHCONx Healthcare Conference, Nov-28-2018 09:30 AM 11/28/18 Other Revised 10/26/18 Biogen Inc. - Special Call 10/26/18 Other Revised 10/25/18 Biogen Inc. - Special Call 10/25/18 Other Revised 10/25/18 Biogen Inc. - Special Call 10/25/18 Earnings Revised 10/23/18 Biogen Inc., Q3 2018 Earnings Call, Oct 23, 2018 10/23/18 Other Revised 09/12/18 Biogen Inc. Presents at Morgan Stanley 16th Annual Global Healthcare Conference, Sep-12-2018 10:30 AM 09/12/18 Other Revised 07/25/18 Biogen Inc. - Special Call 07/25/18 Other Revised 07/25/18 Biogen Inc. Presents at Alzheimer's Association International Conference 2018, Jul-25-2018 03:30 PM 07/25/18 Earnings Revised 07/24/18 Biogen Inc., Q2 2018 Earnings Call, Jul 24, 2018 07/24/18 Other Revised 06/28/18 Biogen Inc. - Special Call 06/28/18 Other Revised 06/12/18 Biogen Inc. - Shareholder/Analyst Call 06/12/18 Other Revised 06/05/18 Biogen Inc. Presents at Jefferies 2018 Global Healthcare Conference, Jun-05-2018 10:30 AM 06/05/18 Other Revised 05/30/18 Biogen Inc. Presents at Bernstein Thirty-Fourth Annual Strategic Decisions Conference, May-30-2018 09:00 AM 05/30/18 Other Revised 05/21/18 Biogen Inc. Presents at 2018 UBS Global Healthcare Conference, May-21-2018 09:30 AM 05/21/18 Earnings Revised 04/24/18 Biogen Inc., Q1 2018 Earnings Call, Apr 24, 2018 04/24/18 Other Revised 04/20/18 Biogen Inc. - Special Call 04/20/18 Other Revised 03/12/18 Biogen Inc. Presents at 38th Annual Cowen and Company Healthcare Conference, Mar-12-2018 03:30 PM 03/12/18 Other Revised 02/14/18 Biogen Inc. Presents at Leerink Partners 7th Annual Global Healthcare Conference, Feb-14-2018 01:30 PM 02/14/18 Earnings Revised 01/25/18 Biogen Inc., Q4 2017 Earnings Call, Jan 25, 2018 01/25/18 Other Revised 01/08/18 Biogen Inc. Presents at 36th Annual J.P. Morgan Healthcare Conference, Jan-08-2018 through Jan-11-2018 01/08/18

Other Revised 12/13/17 Biogen Inc. Presents at Guggenheim Securities 5th Annual Boston Healthcare Conference 2017, Dec-13-2017 12:00 PM 12/13/17 Other Revised 11/29/17 Biogen Inc. Presents at Evercore ISI Biopharma Catalyst/Deep Dive Conference, Nov-29-2017 02:20 PM 11/29/17 Other Revised 11/04/17 Biogen Inc. - Special Call 11/04/17 Other Revised 11/02/17 Biogen Inc. - Special Call 11/02/17 Earnings Revised 10/24/17 Biogen Inc., Q3 2017 Earnings Call, Oct 24, 2017 10/24/17 Other Revised 09/11/17 Biogen Inc. Presents at Morgan Stanley 15th Annual Global Healthcare Conference, Sep-11-2017 11:05 AM 09/11/17 Earnings Revised 07/25/17 Biogen Inc., Q2 2017 Earnings Call, Jul 25, 2017 07/25/17 Other Revised 06/07/17 Biogen Inc. - Shareholder/Analyst Call 06/07/17 Other Revised 05/31/17 Biogen Inc. Presents at Bernstein's 33rd Annual Strategic Decisions Conference 2017, May-31-2017 03:00 PM 05/31/17 Earnings Revised 04/25/17 Biogen Inc., Q1 2017 Earnings Call, Apr 25, 2017 04/25/17 Earnings Revised 01/26/17 Biogen Inc., Q4 2016 Earnings Call, Jan 26, 2017 01/26/17 Other Revised 01/09/17 Biogen Inc. Presents at 35th Annual JP Morgan Healthcare Conference, Jan-09-2017 04:30 PM 01/09/17 Other Revised 01/05/17 Biogen Inc. Presents at Goldman Sachs Healthcare CEOs Unscripted 2017, Jan-05-2017 04:00 PM 01/05/17

Other Revised 12/20/16 Biogen Inc. - Special Call 12/20/16 Other Revised 11/07/16 Biogen Inc. Presents at Credit Suisse 25th Annual Healthcare Conference, Nov-07-2016 09:00 AM 11/07/16 Earnings Revised 10/26/16 Biogen Inc., Q3 2016 Earnings Call, Oct 26, 2016 10/26/16 Other Revised 09/12/16 Biogen Inc. Presents at The 2016 Morgan Stanley Global Healthcare Conference, Sep-12-2016 01:40 PM 09/12/16 Earnings Revised 07/21/16 Biogen Inc., Q2 2016 Earnings Call, Jul 21, 2016 07/21/16 Other Revised 06/08/16 Biogen Inc. - Shareholder/Analyst Call 06/08/16 Other Revised 05/03/16 Biogen Inc. - Special Call 05/03/16 Earnings Revised 04/21/16 Biogen Inc., Q1 2016 Earnings Call, Apr 21, 2016 04/21/16 Other Revised 04/11/16 Biogen Inc. Presents at Goldman Sachs Alzheimer's Symposium, Apr-11-2016 12:20 PM 04/11/16 Other Revised 03/07/16 Biogen Inc. Presents at Cowen and Company 36th Annual Health Care Conference, Mar-07-2016 03:20 PM 03/07/16 Other Revised 02/11/16 Biogen Inc. Presents at The Leerink Partners 5th Annual Global Healthcare Conference, Feb-11-2016 02:15 PM 02/11/16 Earnings Revised 01/27/16 Biogen Inc., Q4 2015 Earnings Call, Jan 27, 2016 01/27/16 Other Revised 01/11/16 Biogen Inc. Presents at JPMorgan 34th Annual Healthcare Conference, Jan-11-2016 03:30 PM 01/11/16

Earnings Revised 10/21/15 Biogen Inc., Q3 2015 Earnings Call, Oct 21, 2015 10/21/15 Other Revised 09/16/15 Biogen Inc. Presents at Morgan Stanley Global Healthcare Conference - New York, Sep-16-2015 03:40 PM 09/16/15 Earnings Revised 07/24/15 Biogen Inc., Q2 2015 Earnings Call, Jul 24, 2015 07/24/15 Other Revised 06/10/15 Biogen Inc. - Shareholder/Analyst Call 06/10/15 Other Revised 05/19/15 Biogen Inc. Presents at UBS Global Healthcare Conference, May-19-2015 01:00 PM 05/19/15 Other Revised 05/13/15 Biogen Inc. Presents at Bank of America Merrill Lynch 2015 Health Care Conference, May-13-2015 11:20 AM 05/13/15 Other Revised 05/06/15 Biogen Inc. Presents at 40th Annual Deutsche Bank Health Care Conference, May-06-2015 11:20 AM 05/06/15 Earnings Revised 04/24/15 Biogen Inc., Q1 2015 Earnings Call, Apr 24, 2015 04/24/15 Other Revised 03/02/15 Biogen Idec Inc. Presents at Cowen and Company 35th Annual Healthcare Conference, Mar-02-2015 02:50 PM 03/02/15 Other Revised 02/25/15 Biogen Idec Inc. Presents at RBC Capital Markets Healthcare Conference 2015, Feb-25-2015 11:00 AM 02/25/15 Earnings Revised 01/29/15 Biogen Idec Inc., Q4 2014 Earnings Call, Jan 29, 2015 01/29/15 Other Revised 01/12/15 Biogen Idec Inc. Presents at 33rd Annual J.P. Morgan Healthcare Conference, Jan-12-2015 03:30 PM 01/12/15

Other Revised 12/02/14 Biogen Idec Inc. Presents at 7th Annual 2014 Deutsche Bank BioFEST, Dec-02-2014 08:10 AM 12/02/14 Earnings Revised 10/22/14 Biogen Idec Inc., Q3 2014 Earnings Call, Oct 22, 2014 10/22/14 Other Revised 09/08/14 Biogen Idec Inc. Presents at 2014 Morgan Stanley Global Healthcare Conference, Sep-08-2014 02:00 PM 09/08/14 Other Revised 09/04/14 Biogen Idec Inc. Presents at Citi's 9th Annual Biotech Conference, Sep-04-2014 10:00 AM 09/04/14 Earnings Revised 07/23/14 Biogen Idec Inc., Q2 2014 Earnings Call, Jul 23, 2014 07/23/14 Other Revised 06/12/14 Biogen Idec Inc. - Shareholder/Analyst Call 06/12/14 Other Revised 05/14/14 Biogen Idec Inc. Presents at Bank of America Merrill Lynch Health Care Conference, May-14-2014 05:00 PM 05/14/14 Other Revised 05/07/14 Biogen Idec Inc. Presents at Deutsche Bank Securities 39th Annual Health Care Conference, May-07-2014 10:40 AM 05/07/14 Earnings Revised 04/23/14 Biogen Idec Inc., Q1 2014 Earnings Call, Apr 23, 2014 04/23/14 Earnings Revised 01/29/14 Biogen Idec Inc., Q4 2013 Earnings Call, Jan 29, 2014 01/29/14 Other Revised 01/13/14 Biogen Idec Inc. Presents at The JPMorgan 32nd Annual Healthcare Conference, Jan-13-2014 03:30 PM 01/13/14 Other Revised 01/07/14 Biogen Idec Inc. Presents at The Goldman Sachs Healthcare CEOs Unscripted: A View From the Top, Jan-07-2014 04:00 PM 01/07/14

Other Revised 12/03/13 Biogen Idec Inc. Presents at 2013 Deutsche Bank BioFEST, Dec-03-2013 10:45 AM 12/03/13 Other Revised 11/12/13 Biogen Idec Inc. Presents at 2013 Credit Suisse Annual Healthcare Conference, Nov-12-2013 08:30 AM 11/12/13 Earnings Revised 10/28/13 Biogen Idec Inc., Q3 2013 Earnings Call, Oct 28, 2013 10/28/13 Other Revised 09/09/13 Biogen Idec Inc. Presents at Morgan Stanley Global Healthcare Conference, Sep-09-2013 03:15 PM 09/09/13 Earnings Revised 07/25/13 Biogen Idec Inc., Q2 2013 Earnings Call, Jul 25, 2013 07/25/13 Other Revised 06/12/13 Biogen Idec Inc. - Shareholder/Analyst Call 06/12/13 Other Revised 05/30/13 Biogen Idec Inc. Presents at 38th Annual Deutsche Bank Health Care Conference, May-30-2013 12:00 PM 05/30/13 Earnings Revised 04/25/13 Biogen Idec Inc., Q1 2013 Earnings Call, Apr 25, 2013 04/25/13 Other Revised 02/25/13 Biogen Idec Inc. Presents at Citi 2013 Global Healthcare Conference, Feb-25-2013 01:30 PM 02/25/13 Other Revised 02/06/13 Biogen Idec Inc. - Special Call 02/06/13 Earnings Revised 01/28/13 Biogen Idec Inc., Q4 2012 Earnings Call, Jan 28, 2013 01/28/13 Other Revised 01/07/13 Biogen Idec Inc. Presents at 31st Annual JPMorgan Healthcare Conference, Jan-07-2013 02:30 PM 01/07/13

Other Revised 12/03/12 Biogen Idec Inc. Presents at Deutsche Bank's 5th Annual dbAccess BioFEST 2012, Dec-03-2012 08:25 AM 12/03/12 Other Revised 11/14/12 Biogen Idec Inc. Presents at Credit Suisse 21st Annual Healthcare Conference, Nov-14-2012 09:30 AM 11/14/12 Earnings Revised 10/25/12 Biogen Idec Inc., Q3 2012 Earnings Call, Oct 25, 2012 10/25/12 Other Revised 09/10/12 Biogen Idec Inc. Presents at Morgan Stanley Global Healthcare Conference, Sep-10-2012 01:50 PM 09/10/12 Earnings Revised 07/24/12 Biogen Idec Inc., Q2 2012 Earnings Call, Jul 24, 2012 07/24/12 Other Revised 06/12/12 Biogen Idec Inc. - Analyst/Investor Day 06/12/12 Other Revised 06/12/12 Biogen Idec Inc. - Analyst/Investor Day 06/12/12 Other Revised 06/08/12 Biogen Idec Inc. - Shareholder/Analyst Call 06/08/12 Earnings Revised 05/01/12 Biogen Idec Inc., Q1 2012 Earnings Call, May 01, 2012 05/01/12 Other Revised 03/13/12 Biogen Idec Inc. Presents at Barclays Capital 2012 Global Healthcare Conference, Mar-13-2012 01:30 PM 03/13/12 Other Revised 02/28/12 Biogen Idec Inc. Presents at Citi Global Healthcare Conference 2012, Feb-28-2012 09:00 AM 02/28/12 Earnings Revised 01/31/12 Biogen Idec Inc., Q4 2011 Earnings Call, Jan 31, 2012 01/31/12 Other Revised 01/09/12 Biogen Idec Inc. Presents at The 30th Annual JPMorgan Chase Healthcare Conference, Jan-09-2012 02:30 PM 01/09/12 Other Revised 01/05/12 Biogen Idec Inc. Presents at Goldman Sachs Healthcare CEOs Unscripted Conference, Jan-05-2012 11:00 AM 01/05/12

Other Revised 12/06/11 Biogen Idec Inc. Presents at 4th Annual 2011 Deutsche Bank BioFEST, Dec-06-2011 08:00 AM 12/06/11 Earnings Revised 10/28/11 Biogen Idec Inc., Q3 2011 Earnings Call, Oct 28, 2011 10/28/11 Other Revised 10/26/11 Biogen Idec Inc. - Special Call 10/26/11 Earnings Revised 07/26/11 Biogen Idec Inc., Q2 2011 Earnings Call, Jul 26, 2011 07/26/11 Other Revised 06/02/11 Biogen Idec Inc. - Shareholder/Analyst Call 06/02/11 Other Revised 05/03/11 Biogen Idec Inc. Presents at Deutsche Bank's 36th Annual Health Care Conference, May-03-2011 08:00 AM 05/03/11 Earnings Revised 04/21/11 Biogen Idec Inc., Q1 2011 Earnings Call, Apr 21, 2011 04/21/11 Earnings Revised 02/01/11 Biogen Idec Inc., Q4 2010 Earnings Call, Feb 01, 2011 02/01/11 Other Revised 01/11/11 Biogen Idec Inc. Presents at JP Morgan 29th Annual Healthcare Conference, Jan-11-2011 03:30 PM 01/11/11

Other Revised 11/03/10 Biogen Idec Inc., 2010 Guidance/Update Call, Nov 03, 2010 11/03/10 Earnings Revised 10/26/10 Biogen Idec Inc., Q3 2010 Earnings Call, Oct 26, 2010 10/26/10 Earnings Revised 07/20/10 Biogen Idec Inc., Q2 2010 Earnings Call, Jul-20-2010 07/20/10 Earnings Revised 04/20/10 Biogen Idec Inc., Q1 2010 Earnings Call, Apr 20, 2010 04/20/10 Earnings Revised 02/09/10 Biogen Idec Inc., Q4 2009 Earnings Call, Feb 09, 2010 02/09/10

Earnings Revised 10/20/09 Biogen Idec Inc., Q3 2009 Earnings Call, Oct-20-2009 10/20/09 Earnings Revised 07/16/09 Biogen Idec Inc., Q2 2009 Earnings Call, Jul-16-2009 07/16/09 Earnings Revised 04/16/09 Biogen Idec Inc., Q1 2009 Earnings Call, Apr-16-2009 04/16/09 Earnings Revised 02/06/09 Biogen Idec Inc., Q4 2008 Earnings Call, Feb-06-2009 02/06/09

Earnings Revised 10/21/08 Biogen Idec Inc., Q3 2008 Earnings Call, Oct-21-2008 10/21/08 Earnings Revised 07/22/08 Biogen Idec Inc., Q2 2008 Earnings Call, Jul-22-2008 07/22/08 Earnings Revised 04/23/08 Biogen Idec Inc., Q1 2008 Earnings Call, Apr-23-2008 04/23/08 Earnings Revised 02/06/08 Biogen Idec Inc., Q4 2007 Earnings Call, Feb-06-2008 02/06/08

Earnings Revised 10/23/07 Biogen Idec Inc., Q3 2007 Earnings Call, Oct-23-2007 10/23/07 Earnings Revised 07/24/07 Biogen Idec Inc., Q2 2007 Earnings Call, Jul-24-2007 07/24/07 Earnings Revised 05/02/07 Biogen Idec Inc., Q1 2007 Earnings Call, May-02-2007 05/02/07 Earnings Revised 02/15/07 Biogen Idec Inc., Q4 2006 Earnings Call, Feb-15-2007 02/15/07

Earnings Revised 10/31/06 Biogen Idec Inc., Q3 2006 Earnings Call, Oct-31-2006 10/31/06 Earnings Revised 07/26/06 Biogen Idec Inc., Q2 2006 Earnings Call, Jul-26-2006 07/26/06 Earnings Revised 02/15/06 Biogen Idec Inc., Q4 2005 Earnings Call, Feb-15-2006 02/15/06