Ticker: BIIB CUSIP: 09062X103 Class: COM
Note: Option positions (PUT/CALL) are excluded.
| Period | Shares | Value ($000) | Average Close | Price Range |
|---|---|---|---|---|
| Q4 2025 | 30,285 | $5 | $163.37 | $138.00 - $185.17 |
| Q3 2025 | 27,782 | $4 | $135.17 | $121.05 - $150.28 |
| Q2 2025 | 28,300 | $4 | $124.60 | $110.04 - $137.32 |
| Q1 2025 | 28,454 | $4 | $142.96 | $128.51 - $157.09 |
| Q4 2024 | 28,201 | $4 | $168.67 | $145.07 - $195.00 |
| Q3 2024 | 28,623 | $6 | $209.21 | $188.78 - $238.00 |
| Q2 2024 | 29,428 | $7 | $217.32 | $189.44 - $237.54 |
| Q1 2024 | 30,017 | $6 | $234.20 | $211.02 - $268.30 |
| Q4 2023 | 34,856 | $9 | $245.62 | $220.86 - $269.43 |
| Q3 2023 | 37,753 | $10 | $267.47 | $251.85 - $287.60 |
| Q2 2023 | 36,760 | $10 | $297.86 | $273.39 - $319.76 |
| Q1 2023 | 37,694 | $10 | $276.70 | $254.80 - $295.90 |
| Q4 2022 | 37,775 | $10 | $282.44 | $250.31 - $311.88 |
| Q3 2022 | 37,228 | $9,940 | $212.38 | $193.65 - $283.44 |
| Q2 2022 | 36,822 | $7,509 | $204.43 | $187.16 - $225.50 |
| Q1 2022 | 36,865 | $7,764 | $217.46 | $192.67 - $249.00 |
| Q4 2021 | 39,532 | $9,485 | $257.12 | $221.72 - $290.76 |
| Q3 2021 | 40,303 | $11,405 | $327.75 | $282.64 - $372.12 |
| Q2 2021 | 42,485 | $14,711 | $302.94 | $257.03 - $468.55 |
| Q1 2021 | 8,628 | $2,414 | $269.69 | $238.40 - $296.38 |
| Q4 2020 | 9,058 | $2,218 | $259.08 | $223.25 - $363.92 |
| Q3 2020 | 9,349 | $2,652 | $278.91 | $261.87 - $312.00 |
| Q2 2020 | 9,874 | $2,642 | $300.59 | $257.60 - $350.24 |
| Q1 2020 | 26,736 | $8,459 | $303.47 | $262.25 - $374.99 |
| Q4 2019 | 28,595 | $8,485 | $277.46 | $219.70 - $318.00 |
| Q3 2019 | 28,640 | $6,668 | $232.85 | $215.78 - $246.99 |
| Q2 2019 | 27,088 | $6,335 | $230.90 | $219.20 - $245.35 |
| Q1 2019 | 29,693 | $7,019 | $314.89 | $216.12 - $344.00 |
| Q4 2018 | 29,385 | $8,843 | $319.14 | $278.46 - $358.41 |
| Q3 2018 | 30,242 | $10,685 | $344.30 | $288.13 - $388.67 |
| Q2 2018 | 32,613 | $9,466 | $281.15 | $249.17 - $310.91 |
| Q1 2018 | 30,785 | $8,430 | $310.41 | $259.76 - $370.57 |
| Q4 2017 | 27,947 | $8,903 | $320.80 | $301.81 - $348.84 |
| Q3 2017 | 25,495 | $7,983 | $296.11 | $269.50 - $330.00 |
| Q2 2017 | 24,999 | $6,784 | $264.42 | $244.28 - $291.90 |
| Q1 2017 | 16,573 | $4,531 | $282.75 | $260.50 - $301.42 |
| Q4 2016 | 23,701 | $6,721 | $296.43 | $268.00 - $329.83 |
| Q3 2016 | 19,586 | $6,131 | $296.18 | $240.07 - $333.65 |
| Q2 2016 | 19,581 | $6,158 | $263.54 | $223.02 - $292.69 |
| Q1 2016 | 8,830 | $2,299 | $264.15 | $242.07 - $301.02 |
| Q4 2015 | 6,748 | $2,067 | $287.35 | $254.00 - $311.65 |
| Q3 2015 | 8,931 | $2,606 | $330.23 | $265.00 - $412.24 |
| Q2 2015 | 8,603 | $3,475 | $401.33 | $368.88 - $432.88 |
| Q1 2015 | 8,268 | $3,491 | $394.14 | $334.40 - $480.18 |
| Q4 2014 | 6,365 | $2,161 | $323.51 | $290.85 - $361.93 |
| Q3 2014 | 7,288 | $2,411 | $329.72 | $298.31 - $349.00 |
| Q2 2014 | 6,846 | $2,159 | $300.97 | $272.02 - $322.25 |
| Q1 2014 | 6,058 | $1,853 | $317.43 | $270.62 - $358.89 |
| Q4 2013 | 6,179 | $1,728 | $258.65 | $221.07 - $298.82 |
| Q1 2013 | 6,203 | $1,197 | $161.63 | $139.72 - $192.92 |
| Q4 2012 | 4,137 | $607 | — | — |
| Q3 2012 | 3,343 | $499 | — | — |
| Q2 2012 | 3,238 | $468 | — | — |
| Q1 2012 | 3,238 | $408 | — | — |
| Q4 2011 | 3,393 | $373 | — | — |
| Q3 2011 | 3,393 | $316 | — | — |
| Q2 2011 | 3,166 | $339 | — | — |
| Q1 2011 | 3,226 | $237 | — | — |
| Q4 2010 | 3,383 | $227 | — | — |