Ticker: BIIB CUSIP: 09062X103 Class: COM
Note: Option positions (PUT/CALL) are excluded.
| Period | Shares | Value ($000) | Average Close | Price Range |
|---|---|---|---|---|
| Q4 2025 | 1,857,262 | $326,860 | $163.37 | $138.00 - $185.17 |
| Q3 2025 | 1,268,350 | $177,671 | $135.17 | $121.05 - $150.28 |
| Q2 2025 | 1,002,502 | $125,904 | $124.60 | $110.04 - $137.32 |
| Q1 2025 | 1,463,720 | $200,296 | $142.96 | $128.51 - $157.09 |
| Q4 2024 | 2,096,314 | $320,568 | $168.67 | $145.07 - $195.00 |
| Q3 2024 | 5,102,469 | $989,063 | $209.21 | $188.78 - $238.00 |
| Q2 2024 | 4,714,957 | $1,093,021 | $217.32 | $189.44 - $237.54 |
| Q1 2024 | 4,694,694 | $1,012,317 | $234.20 | $211.02 - $268.30 |
| Q4 2023 | 5,011,319 | $1,296,779 | $245.62 | $220.86 - $269.43 |
| Q3 2023 | 4,985,752 | $1,281,388 | $267.47 | $251.85 - $287.60 |
| Q2 2023 | 4,471,187 | $1,273,618 | $297.86 | $273.39 - $319.76 |
| Q1 2023 | 4,108,863 | $1,142,386 | $276.70 | $254.80 - $295.90 |
| Q4 2022 | 2,270,307 | $629 | $282.44 | $250.31 - $311.88 |
| Q3 2022 | 2,103,917 | $561,747 | $212.38 | $193.65 - $283.44 |
| Q2 2022 | 1,975,090 | $402,798 | $204.43 | $187.16 - $225.50 |
| Q1 2022 | 2,175,557 | $458,172 | $217.46 | $192.67 - $249.00 |
| Q4 2021 | 4,536,480 | $1,088,392 | $257.12 | $221.72 - $290.76 |
| Q3 2021 | 5,605,297 | $1,586,243 | $327.75 | $282.64 - $372.12 |
| Q2 2021 | 5,354,766 | $1,854,195 | $302.94 | $257.03 - $468.55 |
| Q1 2021 | 3,886,901 | $1,087,362 | $269.69 | $238.40 - $296.38 |
| Q4 2020 | 2,912,021 | $713,038 | $259.08 | $223.25 - $363.92 |
| Q3 2020 | 2,073,725 | $585,516 | $278.91 | $261.87 - $312.00 |
| Q2 2020 | 1,985,715 | $531,280 | $300.59 | $257.60 - $350.24 |
| Q1 2020 | 1,456,795 | $460,900 | $303.47 | $262.25 - $374.99 |
| Q4 2019 | 1,439,824 | $427,238 | $277.46 | $219.70 - $318.00 |
| Q3 2019 | 929,206 | $216,337 | $232.85 | $215.78 - $246.99 |
| Q2 2019 | 959,107 | $229,965 | $230.90 | $219.20 - $245.35 |
| Q1 2019 | 1,787,340 | $422,492 | $314.89 | $216.12 - $344.00 |
| Q4 2018 | 2,667,835 | $802,805 | $319.14 | $278.46 - $358.41 |
| Q3 2018 | 2,809,389 | $992,586 | $344.30 | $288.13 - $388.67 |
| Q2 2018 | 2,562,503 | $743,743 | $281.15 | $249.17 - $310.91 |
| Q1 2018 | 3,070,851 | $840,861 | $310.41 | $259.76 - $370.57 |
| Q4 2017 | 2,816,517 | $897,258 | $320.80 | $301.81 - $348.84 |
| Q3 2017 | 2,484,529 | $770,204 | $296.11 | $269.50 - $330.00 |
| Q2 2017 | 2,276,301 | $617,696 | $264.42 | $244.28 - $291.90 |
| Q1 2017 | 3,617,561 | $989,114 | $282.75 | $260.50 - $301.42 |
| Q4 2016 | 3,635,679 | $1,031,007 | $296.43 | $268.00 - $329.83 |
| Q3 2016 | 3,614,472 | $1,131,478 | $296.18 | $240.07 - $333.65 |
| Q2 2016 | 3,095,544 | $748,564 | $263.54 | $223.02 - $292.69 |
| Q1 2016 | 3,785,227 | $985,371 | $264.15 | $242.07 - $301.02 |
| Q4 2015 | 4,304,492 | $1,318,680 | $287.35 | $254.00 - $311.65 |
| Q3 2015 | 3,946,702 | $1,151,688 | $330.23 | $265.00 - $412.24 |
| Q2 2015 | 4,960,431 | $2,003,714 | $401.33 | $368.88 - $432.88 |
| Q1 2015 | 5,853,035 | $2,471,384 | $394.14 | $334.40 - $480.18 |
| Q4 2014 | 6,974,966 | $2,367,652 | $323.51 | $290.85 - $361.93 |
| Q3 2014 | 6,922,973 | $2,290,190 | $329.72 | $298.31 - $349.00 |
| Q2 2014 | 7,115,053 | $2,243,447 | $300.97 | $272.02 - $322.25 |
| Q1 2014 | 6,184,950 | $1,891,792 | $317.43 | $270.62 - $358.89 |
| Q4 2013 | 6,873,253 | $1,921,569 | $258.65 | $221.07 - $298.82 |
| Q3 2013 | 8,778,415 | $2,113,491 | $223.81 | $203.55 - $248.95 |
| Q2 2013 | 9,788,042 | $2,106,386 | $213.68 | $191.80 - $242.64 |