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BERKSHIRE ASSET MANAGEMENT LLC
> BIIB
| Date | Name | Ticker | Shares | Change | Value | Change | Price |
| 06/30/2023 | BIOGEN INC. | BIIB | 2,204 | -325 | 627,809,000 | -75,329,000 | $284,849.82 |
| 03/31/2023 | BIOGEN INC. | BIIB | 2,529 | 2,529 | 703,138,000 | 703,138,000 | $278,030.05 |
| 12/31/2022 | BIOGEN INC. | BIIB | 0 | -2,352 | 0 | -628,000 | |
| 09/30/2022 | BIOGEN INC. | BIIB | 2,352 | -445 | 628,000 | 58,000 | $267.01 |
| 06/30/2022 | BIOGEN INC. | BIIB | 2,797 | -825 | 570,000 | -193,000 | $203.79 |
| 03/31/2022 | BIOGEN INC. | BIIB | 3,622 | 60 | 763,000 | -92,000 | $210.66 |
| 12/31/2021 | BIOGEN INC. | BIIB | 3,562 | -1,928 | 855,000 | -699,000 | $240.03 |
| 09/30/2021 | BIOGEN INC. | BIIB | 5,490 | -78 | 1,554,000 | -374,000 | $283.06 |
| 06/30/2021 | BIOGEN INC. | BIIB | 5,568 | -285 | 1,928,000 | 291,000 | $346.26 |
| 03/31/2021 | BIOGEN INC. | BIIB | 5,853 | 341 | 1,637,000 | 287,000 | $279.69 |
| 12/31/2020 | BIOGEN INC. | BIIB | 5,512 | 3,331 | 1,350,000 | 731,000 | $244.92 |
| 09/30/2020 | BIOGEN INC. | BIIB | 2,181 | -112 | 619,000 | 6,000 | $283.81 |
| 06/30/2020 | BIOGEN INC. | BIIB | 2,293 | -3,141 | 613,000 | -1,106,000 | $267.34 |
| 03/31/2020 | BIOGEN INC. | BIIB | 5,434 | 3,210 | 1,719,000 | 1,059,000 | $316.34 |
| 12/31/2019 | BIOGEN INC. | BIIB | 2,224 | 67 | 660,000 | 158,000 | $296.76 |
| 09/30/2019 | BIOGEN INC. | BIIB | 2,157 | -113 | 502,000 | -29,000 | $232.73 |
| 06/30/2019 | BIOGEN INC. | BIIB | 2,270 | 258 | 531,000 | 55,000 | $233.92 |
| 03/31/2019 | BIOGEN INC. | BIIB | 2,012 | 10 | 476,000 | -126,000 | $236.58 |
| 12/31/2018 | BIOGEN INC. | BIIB | 2,002 | -145 | 602,000 | -157,000 | $300.70 |
| 09/30/2018 | BIOGEN INC. | BIIB | 2,147 | 12 | 759,000 | 139,000 | $353.52 |
| 06/30/2018 | BIOGEN INC. | BIIB | 2,135 | 329 | 620,000 | 125,000 | $290.40 |
| 03/31/2018 | BIOGEN INC. | BIIB | 1,806 | -64 | 495,000 | -101,000 | $274.09 |
| 12/31/2017 | BIOGEN INC. | BIIB | 1,870 | 28 | 596,000 | 19,000 | $318.72 |
| 09/30/2017 | BIOGEN INC. | BIIB | 1,842 | -125 | 577,000 | 43,000 | $313.25 |
| 06/30/2017 | BIOGEN INC. | BIIB | 1,967 | -230 | 534,000 | -67,000 | $271.48 |
| 03/31/2017 | BIOGEN INC. | BIIB | 2,197 | 189 | 601,000 | 32,000 | $273.55 |
| 12/31/2016 | BIOGEN INC. | BIIB | 2,008 | -328 | 569,000 | -162,000 | $283.37 |
| 09/30/2016 | BIOGEN INC. | BIIB | 2,336 | -1,427 | 731,000 | -179,000 | $312.93 |
| 06/30/2016 | BIOGEN INC. | BIIB | 3,763 | 3,763 | 910,000 | 910,000 | $241.83 |
| 03/31/2016 | BIOGEN INC. | BIIB | 2,964 | -721 | 772,000 | 308,000 | $260.46 |
| 12/31/2015 | BIOGEN INC. | BIIB | 2,896 | -789 | 887,000 | 423,000 | $306.28 |
| 09/30/2015 | BIOGEN INC. | BIIB | 2,746 | 869 | 801,000 | 43,000 | $291.70 |
| 06/30/2015 | BIOGEN INC. | BIIB | 1,877 | -33 | 758,000 | -48,000 | $403.84 |
| 03/31/2015 | BIOGEN INC. | BIIB | 1,910 | -266 | 806,000 | 67,000 | $421.99 |
| 12/31/2014 | BIOGEN INC. | BIIB | 2,176 | 43 | 739,000 | 33,000 | $339.61 |
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