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GILDER GAGNON HOWE & CO LLC
> BIIB
| Date | Name | Ticker | Shares | Change | Value | Change | Price |
| 06/30/2023 | BIOGEN INC. | BIIB | 80,297 | 25,885 | 22,872,600,000 | 7,744,432,000 | $284,849.99 |
| 03/31/2023 | BIOGEN INC. | BIIB | 54,412 | 54,412 | 15,128,168,000 | 15,128,168,000 | $278,029.99 |
| 09/30/2021 | BIOGEN INC. | BIIB | 0 | -2,794 | 0 | -967,000 | |
| 06/30/2021 | BIOGEN INC. | BIIB | 2,794 | -3,634 | 967,000 | -831,000 | $346.10 |
| 03/31/2021 | BIOGEN INC. | BIIB | 6,428 | 6,428 | 1,798,000 | 1,798,000 | $279.71 |
| 12/31/2016 | BIOGEN INC. | BIIB | 0 | -177 | 0 | -55,000 | |
| 09/30/2016 | BIOGEN INC. | BIIB | 177 | 177 | 55,000 | 55,000 | $310.73 |
| 09/30/2015 | BIOGEN INC. | BIIB | 0 | -1,062 | 0 | -429,000 | |
| 06/30/2015 | BIOGEN INC. | BIIB | 1,062 | 980 | 429,000 | 401,000 | $403.95 |
| 03/31/2015 | BIOGEN INC. | BIIB | 1,064 | 982 | 449,000 | 421,000 | $421.99 |
| 12/31/2014 | BIOGEN INC. | BIIB | 82 | 82 | 28,000 | 28,000 | $341.46 |
| 12/31/2012 | BIOGEN INC. | BIIB | 0 | -8,582 | 0 | -1,280,520 | |
| 09/30/2012 | BIOGEN INC. | BIIB | 8,582 | -4,511 | 1,280,520 | -609,847 | $149.21 |
| 06/30/2012 | BIOGEN INC. | BIIB | 13,093 | 13,093 | 1,890,367 | 1,890,367 | $144.38 |
| 09/30/2005 | BIOGEN INC. | BIIB | 0 | -820 | 0 | -28,249 | |
| 06/30/2005 | BIOGEN INC. | BIIB | 820 | 820 | 28,249 | 28,249 | $34.45 |
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