| BIIB | | BIOGEN INC. | Gregory F. Covino | VP, Chief Accounting Officer | Feb 23, 2018 | Tax Payment (Shares) | $292.78 | 28 | 8,198 | 4,744 | Feb 27, 2018, 06:24 PM |
| BIIB | | BIOGEN INC. | Gregory F. Covino | VP, Chief Accounting Officer | Feb 23, 2018 | Option/RSU Exercise | - | 92 | - | 4,772 | Feb 27, 2018, 06:24 PM |
| BIIB | | BIOGEN INC. | Gregory F. Covino | VP, Chief Accounting Officer | Feb 22, 2018 | Tax Payment (Shares) | $284.81 | 58 | 16,519 | 4,680 | Feb 26, 2018, 12:00 AM |
| BIIB | | BIOGEN INC. | Gregory F. Covino | VP, Chief Accounting Officer | Feb 22, 2018 | Option/RSU Exercise | - | 194 | - | 4,738 | Feb 26, 2018, 12:00 AM |
| BIIB | | BIOGEN INC. | Gregory F. Covino | VP, Chief Accounting Officer | Feb 15, 2018 | Tax Payment (Shares) | $299.38 | 56 | 16,765 | 4,544 | Feb 20, 2018, 12:00 AM |
| BIIB | | BIOGEN INC. | Gregory F. Covino | VP, Chief Accounting Officer | Feb 15, 2018 | Option/RSU Exercise | - | 161 | - | 4,600 | Feb 20, 2018, 12:00 AM |
| BIIB | | BIOGEN INC. | Gregory F. Covino | VP, Chief Accounting Officer | Dec 01, 2017 | Tax Payment (Shares) | $319.35 | 157 | 50,138 | 4,542 | Dec 05, 2017, 04:36 PM |
| BIIB | | BIOGEN INC. | Gregory F. Covino | VP, Chief Accounting Officer | Feb 28, 2017 | Tax Payment (Shares) | $285.23 | 89 | 25,386 | 4,505 | Mar 02, 2017, 05:18 PM |
| BIIB | | BIOGEN INC. | Gregory F. Covino | VP, Chief Accounting Officer | Feb 28, 2017 | Option/RSU Exercise | - | 681 | - | 4,508 | Mar 02, 2017, 05:18 PM |
| BIIB | | BIOGEN INC. | Gregory F. Covino | VP, Chief Accounting Officer | Dec 01, 2016 | Tax Payment (Shares) | $295.78 | 53 | 15,676 | 3,884 | Dec 05, 2016, 04:32 PM |
| BIIB | | BIOGEN INC. | Gregory F. Covino | VP, Chief Accounting Officer | May 01, 2016 | Option/RSU Exercise | - | 348 | - | 3,120 | May 02, 2016, 04:36 PM |
| BIIB | | BIOGEN INC. | Gregory F. Covino | VP, Chief Accounting Officer | May 01, 2016 | Tax Payment (Shares) | $274.99 | 113 | 31,074 | 3,007 | May 02, 2016, 04:36 PM |
| BIIB | | BIOGEN INC. | Gregory F. Covino | VP, Chief Accounting Officer | Feb 23, 2016 | Tax Payment (Shares) | $258.99 | 22 | 5,698 | 2,687 | Feb 25, 2016, 05:09 PM |
| BIIB | | BIOGEN INC. | Gregory F. Covino | VP, Chief Accounting Officer | Feb 23, 2016 | Option/RSU Exercise | - | 66 | - | 2,709 | Feb 25, 2016, 05:09 PM |
| BIIB | | BIOGEN INC. | Gregory F. Covino | VP, Chief Accounting Officer | Feb 12, 2016 | Tax Payment (Shares) | $247.22 | 26 | 6,428 | 2,643 | Feb 17, 2016, 05:59 PM |
| BIIB | | BIOGEN INC. | Gregory F. Covino | VP, Chief Accounting Officer | Feb 12, 2016 | Option/RSU Exercise | - | 425 | - | 2,645 | Feb 17, 2016, 05:59 PM |
| BIIB | | BIOGEN INC. | Gregory F. Covino | VP, Chief Accounting Officer | May 01, 2015 | Tax Payment (Shares) | $386.22 | 113 | 43,643 | 1,761 | May 05, 2015, 04:36 PM |
| BIIB | | BIOGEN INC. | Gregory F. Covino | VP, Chief Accounting Officer | May 01, 2015 | Option/RSU Exercise | $386.22 | 347 | 134,018 | 1,874 | May 05, 2015, 04:36 PM |
| BIIB | | BIOGEN IDEC INC. | Gregory F. Covino | VP, Chief Accounting Officer | Feb 12, 2015 | Tax Payment (Shares) | $392.11 | 8 | 3,137 | 1,302 | Feb 23, 2015, 04:24 PM |
| BIIB | | BIOGEN IDEC INC. | Gregory F. Covino | VP, Chief Accounting Officer | Feb 12, 2015 | Tax Payment (Shares) | $392.11 | 20 | 7,842 | 1,446 | Feb 17, 2015, 09:16 PM |
| BIIB | | BIOGEN IDEC INC. | Gregory F. Covino | VP, Chief Accounting Officer | Feb 12, 2015 | Option/RSU Exercise | - | 471 | - | 1,450 | Feb 17, 2015, 09:16 PM |
| BIIB | | BIOGEN IDEC INC. | Gregory F. Covino | VP, Chief Accounting Officer | May 01, 2014 | Option/RSU Exercise | $286.75 | 347 | 99,502 | 1,029 | May 02, 2014, 04:20 PM |
| BIIB | | BIOGEN IDEC INC. | Gregory F. Covino | VP, Chief Accounting Officer | May 01, 2014 | Tax Payment (Shares) | $286.75 | 113 | 32,403 | 916 | May 02, 2014, 04:20 PM |
| BIIB | | BIOGEN IDEC INC. | Gregory F. Covino | VP, Chief Accounting Officer | Feb 12, 2014 | Tax Payment (Shares) | $323.04 | 8 | 2,584 | 682 | Feb 14, 2014, 04:38 PM |
| BIIB | | BIOGEN IDEC INC. | Gregory F. Covino | VP, Chief Accounting Officer | Feb 12, 2014 | Option/RSU Exercise | - | 315 | - | 690 | Feb 14, 2014, 04:38 PM |
| BIIB | | BIOGEN IDEC INC. | Gregory F. Covino | VP, Chief Accounting Officer | May 01, 2013 | Tax Payment (Shares) | $214.33 | 114 | 24,434 | 375 | May 03, 2013, 03:10 PM |
| BIIB | | BIOGEN IDEC INC. | Gregory F. Covino | VP, Chief Accounting Officer | May 01, 2013 | Option/RSU Exercise | - | 347 | - | 489 | May 03, 2013, 03:10 PM |
