Ticker: BIIB CUSIP: 09062X103 Class: COM
Note: Option positions (PUT/CALL) are excluded.
| Period | Shares | Value ($000) | Average Close | Price Range |
|---|---|---|---|---|
| Q4 2025 | 1,099,366 | $193,477 | $163.37 | $138.00 - $185.17 |
| Q3 2025 | 1,063,586 | $148,987 | $135.17 | $121.05 - $150.28 |
| Q2 2025 | 670,852 | $84,252 | $124.60 | $110.04 - $137.32 |
| Q1 2025 | 604,697 | $82,747 | $142.96 | $128.51 - $157.09 |
| Q4 2024 | 770,320 | $117,797 | $168.67 | $145.07 - $195.00 |
| Q3 2024 | 989,041 | $191,716 | $209.21 | $188.78 - $238.00 |
| Q2 2024 | 1,420,860 | $329,384 | $217.32 | $189.44 - $237.54 |
| Q1 2024 | 994,365 | $214,415 | $234.20 | $211.02 - $268.30 |
| Q4 2023 | 1,095,823 | $283,566 | $245.62 | $220.86 - $269.43 |
| Q3 2023 | 790,845 | $203,255 | $267.47 | $251.85 - $287.60 |
| Q2 2023 | 825,665 | $235,191 | $297.86 | $273.39 - $319.76 |
| Q1 2023 | 661,449 | $183,903 | $276.70 | $254.80 - $295.90 |
| Q4 2022 | 978,882 | $271,072 | $282.44 | $250.31 - $311.88 |
| Q3 2022 | 1,397,644 | $373 | $212.38 | $193.65 - $283.44 |
| Q2 2022 | 1,644,049 | $335 | $204.43 | $187.16 - $225.50 |
| Q1 2022 | 1,310,104 | $275,908 | $217.46 | $192.67 - $249.00 |
| Q4 2021 | 949,240 | $227,743 | $257.12 | $221.72 - $290.76 |
| Q3 2021 | 799,928 | $226,372 | $327.75 | $282.64 - $372.12 |
| Q2 2021 | 841,078 | $291,240 | $302.94 | $257.03 - $468.55 |
| Q1 2021 | 837,560 | $234,307 | $269.69 | $238.40 - $296.38 |
| Q4 2020 | 548,128 | $134,215 | $259.08 | $223.25 - $363.92 |
| Q3 2020 | 886,375 | $251,447 | $278.91 | $261.87 - $312.00 |
| Q2 2020 | 1,337,631 | $357,884 | $300.59 | $257.60 - $350.24 |
| Q1 2020 | 1,275,764 | $403,625 | $303.47 | $262.25 - $374.99 |
| Q4 2019 | 1,771,627 | $525,695 | $277.46 | $219.70 - $318.00 |
| Q3 2019 | 1,790,809 | $416,936 | $232.85 | $215.78 - $246.99 |
| Q2 2019 | 1,790,203 | $418,674 | $230.90 | $219.20 - $245.35 |
| Q1 2019 | 1,665,482 | $393,687 | $314.89 | $216.12 - $344.00 |
| Q4 2018 | 1,801,221 | $542,023 | $319.14 | $278.46 - $358.41 |
| Q3 2018 | 2,263,253 | $799,629 | $344.30 | $288.13 - $388.67 |
| Q2 2018 | 2,273,302 | $659,802 | $281.15 | $249.17 - $310.91 |
| Q1 2018 | 2,448,853 | $670,545 | $310.41 | $259.76 - $370.57 |
| Q4 2017 | 2,295,302 | $731,215 | $320.80 | $301.81 - $348.84 |
| Q3 2017 | 2,116,768 | $662,805 | $296.11 | $269.50 - $330.00 |
| Q2 2017 | 1,733,493 | $470,401 | $264.42 | $244.28 - $291.90 |
| Q1 2017 | 1,738,842 | $475,434 | $282.75 | $260.50 - $301.42 |
| Q4 2016 | 1,298,065 | $368,106 | $296.43 | $268.00 - $329.83 |
| Q3 2016 | 1,157,333 | $362,281 | $296.18 | $240.07 - $333.65 |
| Q2 2016 | 1,131,995 | $273,738 | $263.54 | $223.02 - $292.69 |
| Q1 2016 | 1,438,109 | $374,370 | $264.15 | $242.07 - $301.02 |
| Q4 2015 | 1,541,073 | $472,108 | $287.35 | $254.00 - $311.65 |
| Q3 2015 | 1,698,449 | $495,624 | $330.23 | $265.00 - $412.24 |
| Q2 2015 | 1,433,698 | $579,127 | $401.33 | $368.88 - $432.88 |
| Q1 2015 | 1,264,485 | $533,916 | $394.14 | $334.40 - $480.18 |
| Q4 2014 | 1,802,529 | $611,869 | $323.51 | $290.85 - $361.93 |
| Q3 2014 | 1,193,447 | $394,805 | $329.72 | $298.31 - $349.00 |
| Q2 2014 | 1,398,474 | $440,954 | $300.97 | $272.02 - $322.25 |
| Q1 2014 | 1,237,049 | $378,376 | $317.43 | $270.62 - $358.89 |
| Q4 2013 | 1,148,026 | $320,957 | $258.65 | $221.07 - $298.82 |
| Q3 2013 | 885,437 | $213,178 | $223.81 | $203.55 - $248.95 |
| Q2 2013 | 1,044,044 | $224,678 | $213.68 | $191.80 - $242.64 |
| Q4 2012 | 828,118 | $121,213 | — | — |
| Q3 2012 | 890,332 | $132,847 | — | — |
| Q2 2012 | 778,457 | $112,394 | — | — |
| Q1 2012 | 813,669 | $102,522 | — | — |