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PRIMECAP MANAGEMENT CO
> BIIB
| Date | Name | Ticker | Shares | Change | Value | Change | Price |
| 06/30/2023 | BIOGEN INC. | BIIB | 16,025,876 | 24,710 | 4,564,970,779,000 | 116,166,596,000 | $284,850.00 |
| 03/31/2023 | BIOGEN INC. | BIIB | 16,001,166 | 259,451 | 4,448,804,183,000 | 4,444,601,145,000 | $278,030.00 |
| 09/30/2022 | BIOGEN INC. | BIIB | 15,741,715 | 15,189 | 4,203,038,000 | 995,770,000 | $267.00 |
| 06/30/2022 | BIOGEN INC. | BIIB | 15,726,526 | -108,080 | 3,207,268,000 | -127,500,000 | $203.94 |
| 03/31/2022 | BIOGEN INC. | BIIB | 15,834,606 | 77,201 | 3,334,768,000 | -445,749,000 | $210.60 |
| 12/31/2021 | BIOGEN INC. | BIIB | 15,757,405 | -501,510 | 3,780,517,000 | -820,593,000 | $239.92 |
| 09/30/2021 | BIOGEN INC. | BIIB | 16,258,915 | -499,341 | 4,601,110,000 | -87,012,000 | $282.99 |
| 03/31/2021 | BIOGEN INC. | BIIB | 16,758,256 | 936,190 | 4,688,122,000 | 813,931,000 | $279.75 |
| 12/31/2020 | BIOGEN INC. | BIIB | 15,822,066 | 125,362 | 3,874,191,081 | -578,649,919 | $244.86 |
| 09/30/2020 | BIOGEN INC. | BIIB | 15,696,704 | 64,772 | 4,452,841,000 | 270,518,000 | $283.68 |
| 06/30/2020 | BIOGEN INC. | BIIB | 15,631,932 | -334,057 | 4,182,323,000 | -868,997,000 | $267.55 |
| 03/31/2020 | BIOGEN INC. | BIIB | 15,965,989 | 776,508 | 5,051,320,000 | 544,145,000 | $316.38 |
| 12/31/2019 | BIOGEN INC. | BIIB | 15,189,481 | 929,469 | 4,507,175,000 | 1,187,159,000 | $296.73 |
| 09/30/2019 | BIOGEN INC. | BIIB | 14,260,012 | -293,990 | 3,320,016,000 | -83,728,000 | $232.82 |
| 06/30/2019 | BIOGEN INC. | BIIB | 14,554,002 | -32,380 | 3,403,744,000 | -44,185,000 | $233.87 |
| 03/31/2019 | BIOGEN INC. | BIIB | 14,586,382 | -129,835 | 3,447,929,000 | -980,475,000 | $236.38 |
| 12/31/2018 | BIOGEN INC. | BIIB | 14,716,217 | -157,579 | 4,428,404,000 | -826,657,000 | $300.92 |
| 09/30/2018 | BIOGEN INC. | BIIB | 14,873,796 | -48,140 | 5,255,061,000 | 924,118,000 | $353.31 |
| 06/30/2018 | BIOGEN INC. | BIIB | 14,921,936 | -31,295 | 4,330,943,000 | 236,449,000 | $290.24 |
| 03/31/2018 | BIOGEN INC. | BIIB | 14,953,231 | -156,000 | 4,094,494,000 | -718,854,000 | $273.82 |
| 12/31/2017 | BIOGEN INC. | BIIB | 15,109,231 | -103,683 | 4,813,347,720 | 49,879,720 | $318.57 |
| 09/30/2017 | BIOGEN INC. | BIIB | 15,212,914 | -178,487 | 4,763,468,000 | 586,857,000 | $313.12 |
| 06/30/2017 | BIOGEN INC. | BIIB | 15,391,401 | -86,023 | 4,176,611,000 | -55,226,000 | $271.36 |
| 03/31/2017 | BIOGEN INC. | BIIB | 15,477,424 | -106,963 | 4,231,837,000 | -187,583,000 | $273.42 |
| 12/31/2016 | BIOGEN INC. | BIIB | 15,584,387 | -109,518 | 4,419,420,000 | -493,243,000 | $283.58 |
| 09/30/2016 | BIOGEN INC. | BIIB | 15,693,905 | -330,956 | 4,912,663,000 | 1,037,531,000 | $313.03 |
| 06/30/2016 | BIOGEN INC. | BIIB | 16,024,861 | 16,024,861 | 3,875,132,000 | 3,875,132,000 | $241.82 |
| 03/31/2016 | BIOGEN INC. | BIIB | 16,246,726 | 436,101 | 4,229,348,000 | -614,237,000 | $260.32 |
| 12/31/2015 | BIOGEN INC. | BIIB | 15,810,625 | -1,360,068 | 4,843,585,000 | -985,007,000 | $306.35 |
| 09/30/2015 | BIOGEN INC. | BIIB | 15,843,460 | -1,327,233 | 4,623,280,000 | -1,205,312,000 | $291.81 |
| 06/30/2015 | BIOGEN INC. | BIIB | 16,501,541 | -669,152 | 6,665,632,000 | 837,040,000 | $403.94 |
| 03/31/2015 | BIOGEN INC. | BIIB | 16,558,763 | -611,930 | 6,991,772,000 | 1,163,180,000 | $422.24 |
| 12/31/2014 | BIOGEN INC. | BIIB | 17,170,693 | 17,170,693 | 5,828,592,000 | 5,828,592,000 | $339.45 |
| 09/30/2014 | BIOGEN INC. | BIIB | 17,216,631 | -285,475 | 5,695,434,000 | 342,065,000 | $330.81 |
| 06/30/2014 | BIOGEN INC. | BIIB | 17,258,311 | -243,795 | 5,441,718,000 | 88,349,000 | $315.31 |
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