Ticker: BIIB CUSIP: 09062X103 Class: COM
Note: Option positions (PUT/CALL) are excluded.
| Period | Shares | Value ($000) | Average Close | Price Range |
|---|---|---|---|---|
| Q4 2025 | 9,425,863 | $1,658,857 | $163.37 | $138.00 - $185.17 |
| Q3 2025 | 1,287,760 | $180,389 | $135.17 | $121.05 - $150.28 |
| Q2 2025 | 1,674,220 | $210,265 | $124.60 | $110.04 - $137.32 |
| Q1 2025 | 1,308,828 | $179,100 | $142.96 | $128.51 - $157.09 |
| Q4 2024 | 757,570 | $115,848 | $168.67 | $145.07 - $195.00 |
| Q3 2024 | 381,214 | $73,895 | $209.21 | $188.78 - $238.00 |
| Q2 2024 | 610,416 | $141,507 | $217.32 | $189.44 - $237.54 |
| Q1 2024 | 620,850 | $133,874 | $234.20 | $211.02 - $268.30 |
| Q4 2023 | 1,001,144 | $259,066 | $245.62 | $220.86 - $269.43 |
| Q3 2023 | 1,361,051 | $349,804 | $267.47 | $251.85 - $287.60 |
| Q2 2023 | 2,640,521 | $752,152 | $297.86 | $273.39 - $319.76 |
| Q1 2023 | 1,752,614 | $487,279 | $276.70 | $254.80 - $295.90 |
| Q4 2022 | 1,211,193 | $335,404 | $282.44 | $250.31 - $311.88 |
| Q3 2022 | 1,476,232 | $394,154 | $212.38 | $193.65 - $283.44 |
| Q2 2022 | 1,026,166 | $209,277 | $204.43 | $187.16 - $225.50 |
| Q1 2022 | 387,970 | $81,707 | $217.46 | $192.67 - $249.00 |
| Q4 2021 | 187,301 | $44,937 | $257.12 | $221.72 - $290.76 |
| Q3 2021 | 1,177,553 | $333,235 | $327.75 | $282.64 - $372.12 |
| Q2 2021 | 1,352,218 | $468,233 | $302.94 | $257.03 - $468.55 |
| Q1 2021 | 1,915,216 | $535,782 | $269.69 | $238.40 - $296.38 |
| Q4 2020 | 1,981,868 | $485,280 | $259.08 | $223.25 - $363.92 |
| Q3 2020 | 1,084,826 | $307,743 | $278.91 | $261.87 - $312.00 |
| Q2 2020 | 1,142,394 | $305,648 | $300.59 | $257.60 - $350.24 |
| Q1 2020 | 2,187,836 | $692,187 | $303.47 | $262.25 - $374.99 |
| Q4 2019 | 1,458,609 | $432,813 | $277.46 | $219.70 - $318.00 |
| Q3 2019 | 1,719,672 | $400,374 | $232.85 | $215.78 - $246.99 |
| Q2 2019 | 2,042,276 | $477,627 | $230.90 | $219.20 - $245.35 |
| Q1 2019 | 2,551,666 | $603,162 | $314.89 | $216.12 - $344.00 |
| Q4 2018 | 3,671,066 | $1,104,697 | $319.14 | $278.46 - $358.41 |
| Q3 2018 | 4,322,187 | $1,527,072 | $344.30 | $288.13 - $388.67 |
| Q2 2018 | 5,348,115 | $1,552,237 | $281.15 | $249.17 - $310.91 |
| Q1 2018 | 6,771,037 | $1,854,045 | $310.41 | $259.76 - $370.57 |
| Q4 2017 | 9,092,419 | $2,896,571 | $320.80 | $301.81 - $348.84 |
| Q3 2017 | 7,151,969 | $2,239,425 | $296.11 | $269.50 - $330.00 |
| Q2 2017 | 6,104,026 | $1,656,390 | $264.42 | $244.28 - $291.90 |
| Q1 2017 | 5,542,590 | $1,515,455 | $282.75 | $260.50 - $301.42 |
| Q4 2016 | 8,200,534 | $2,325,508 | $296.43 | $268.00 - $329.83 |
| Q3 2016 | 9,718,551 | $3,042,197 | $296.18 | $240.07 - $333.65 |
| Q2 2016 | 11,442,148 | $2,766,940 | $263.54 | $223.02 - $292.69 |
| Q1 2016 | 13,493,064 | $3,512,514 | $264.15 | $242.07 - $301.02 |
| Q4 2015 | 12,925,995 | $3,959,878 | $287.35 | $254.00 - $311.65 |
| Q3 2015 | 16,563,800 | $4,833,482 | $330.23 | $265.00 - $412.24 |
| Q2 2015 | 21,738,394 | $8,781,007 | $401.33 | $368.88 - $432.88 |
| Q1 2015 | 22,041,151 | $9,306,655 | $394.14 | $334.40 - $480.18 |
| Q4 2014 | 19,788,113 | $6,717,074 | $323.51 | $290.85 - $361.93 |
| Q3 2014 | 19,002,794 | $6,286,313 | $329.72 | $298.31 - $349.00 |
| Q2 2014 | 21,144,772 | $6,667,159 | $300.97 | $272.02 - $322.25 |
| Q1 2014 | 21,925,328 | $6,706,300 | $317.43 | $270.62 - $358.89 |
| Q4 2013 | 24,041,515 | $6,725,614 | $258.65 | $221.07 - $298.82 |
| Q3 2013 | 25,640,507 | $6,173,208 | $223.81 | $203.55 - $248.95 |
| Q2 2013 | 23,528,529 | $5,063,340 | $213.68 | $191.80 - $242.64 |