Ticker: BIIB CUSIP: 09062X103 Class: COM
Note: Option positions (PUT/CALL) are excluded.
| Period | Shares | Value ($000) | Average Close | Price Range |
|---|---|---|---|---|
| Q4 2025 | 3,551,269 | $624,988 | $163.37 | $138.00 - $185.17 |
| Q3 2025 | 4,246,504 | $594,850 | $135.17 | $121.05 - $150.28 |
| Q2 2025 | 4,798,420 | $602,634 | $124.60 | $110.04 - $137.32 |
| Q1 2025 | 4,672,437 | $639,376 | $142.96 | $128.51 - $157.09 |
| Q4 2024 | 4,930,723 | $754,006 | $168.67 | $145.07 - $195.00 |
| Q3 2024 | 5,131,193 | $994,630 | $209.21 | $188.78 - $238.00 |
| Q2 2024 | 5,166,491 | $1,197,696 | $217.32 | $189.44 - $237.54 |
| Q1 2024 | 5,120,142 | $1,104,056 | $234.20 | $211.02 - $268.30 |
| Q4 2023 | 5,324,396 | $1,377,794 | $245.62 | $220.86 - $269.43 |
| Q3 2023 | 5,374,310 | $1,381,251 | $267.47 | $251.85 - $287.60 |
| Q2 2023 | 5,346,359 | $1,522,910 | $297.86 | $273.39 - $319.76 |
| Q1 2023 | 5,452,888 | $1,516,066 | $276.70 | $254.80 - $295.90 |
| Q4 2022 | 5,411,213 | $1,498,473 | $282.44 | $250.31 - $311.88 |
| Q3 2022 | 5,135,617 | $1,371,210 | $212.38 | $193.65 - $283.44 |
| Q2 2022 | 6,286,725 | $1,282,115 | $204.43 | $187.16 - $225.50 |
| Q1 2022 | 6,249,526 | $1,316,151 | $217.46 | $192.67 - $249.00 |
| Q4 2021 | 6,184,455 | $1,483,776 | $257.12 | $221.72 - $290.76 |
| Q3 2021 | 5,577,720 | $1,578,439 | $327.75 | $282.64 - $372.12 |
| Q2 2021 | 5,601,861 | $1,939,756 | $302.94 | $257.03 - $468.55 |
| Q1 2021 | 5,902,841 | $1,651,320 | $269.69 | $238.40 - $296.38 |
| Q4 2020 | 5,781,973 | $1,415,774 | $259.08 | $223.25 - $363.92 |
| Q3 2020 | 4,857,192 | $1,377,888 | $278.91 | $261.87 - $312.00 |
| Q2 2020 | 4,773,760 | $1,277,219 | $300.59 | $257.60 - $350.24 |
| Q1 2020 | 4,095,239 | $1,295,651 | $303.47 | $262.25 - $374.99 |
| Q4 2019 | 4,655,756 | $1,381,503 | $277.46 | $219.70 - $318.00 |
| Q3 2019 | 3,672,196 | $854,961 | $232.85 | $215.78 - $246.99 |
| Q2 2019 | 3,798,965 | $888,464 | $230.90 | $219.20 - $245.35 |
| Q1 2019 | 5,208,902 | $1,231,280 | $314.89 | $216.12 - $344.00 |
| Q4 2018 | 5,400,991 | $1,625,267 | $319.14 | $278.46 - $358.41 |
| Q3 2018 | 5,534,010 | $1,955,221 | $344.30 | $288.13 - $388.67 |
| Q2 2018 | 5,060,130 | $1,468,653 | $281.15 | $249.17 - $310.91 |
| Q1 2018 | 5,073,805 | $1,389,310 | $310.41 | $259.76 - $370.57 |
| Q4 2017 | 5,109,262 | $1,627,659 | $320.80 | $301.81 - $348.84 |
| Q3 2017 | 5,167,662 | $1,618,099 | $296.11 | $269.50 - $330.00 |
| Q2 2017 | 5,228,480 | $1,418,801 | $264.42 | $244.28 - $291.90 |
| Q1 2017 | 5,712,355 | $1,561,872 | $282.75 | $260.50 - $301.42 |
| Q4 2016 | 5,844,274 | $1,657,318 | $296.43 | $268.00 - $329.83 |
| Q3 2016 | 4,537,579 | $1,420,398 | $296.18 | $240.07 - $333.65 |
| Q2 2016 | 4,811,659 | $1,163,555 | $263.54 | $223.02 - $292.69 |
| Q1 2016 | 4,658,269 | $1,212,640 | $264.15 | $242.07 - $301.02 |
| Q4 2015 | 5,279,240 | $1,617,295 | $287.35 | $254.00 - $311.65 |
| Q3 2015 | 5,662,893 | $1,652,489 | $330.23 | $265.00 - $412.24 |
| Q2 2015 | 4,834,187 | $1,952,721 | $401.33 | $368.88 - $432.88 |
| Q1 2015 | 3,467,280 | $1,464,025 | $394.14 | $334.40 - $480.18 |
| Q4 2014 | 2,535,845 | $860,792 | $323.51 | $290.85 - $361.93 |
| Q3 2014 | 1,529,050 | $505,825 | $329.72 | $298.31 - $349.00 |
| Q2 2014 | 1,801,125 | $567,912 | $300.97 | $272.02 - $322.25 |
| Q1 2014 | 2,641,911 | $808,081 | $317.43 | $270.62 - $358.89 |
| Q4 2013 | 3,173,597 | $887,814 | $258.65 | $221.07 - $298.82 |
| Q3 2013 | 3,766,804 | $906,895 | $223.81 | $203.55 - $248.95 |
| Q2 2013 | 3,543,369 | $762,532 | $213.68 | $191.80 - $242.64 |