Ticker: BIIB CUSIP: 09062X103 Class: COM
Note: Option positions (PUT/CALL) are excluded.
| Period | Shares | Value ($000) | Average Close | Price Range |
|---|---|---|---|---|
| Q4 2025 | 7,159,020 | $1,259,916 | $163.37 | $138.00 - $185.17 |
| Q3 2025 | 7,319,749 | $1,025,350 | $135.17 | $121.05 - $150.28 |
| Q2 2025 | 7,468,807 | $938,007 | $124.60 | $110.04 - $137.32 |
| Q1 2025 | 7,396,910 | $1,012,193 | $142.96 | $128.51 - $157.09 |
| Q4 2024 | 7,398,248 | $1,131,230 | $168.67 | $145.07 - $195.00 |
| Q3 2024 | 7,344,960 | $1,423,747 | $209.21 | $188.78 - $238.00 |
| Q2 2024 | 7,096,018 | $1,644,999 | $217.32 | $189.44 - $237.54 |
| Q1 2024 | 6,747,008 | $1,454,857 | $234.20 | $211.02 - $268.30 |
| Q4 2023 | 6,945,665 | $1,797,330 | $245.62 | $220.86 - $269.43 |
| Q3 2023 | 6,865,654 | $1,764,542 | $267.47 | $251.85 - $287.60 |
| Q2 2023 | 6,885,215 | $1,961,253 | $297.86 | $273.39 - $319.76 |
| Q1 2023 | 6,757,000 | $1,878,641 | $276.70 | $254.80 - $295.90 |
| Q4 2022 | 6,808,274 | $1,885,347 | $282.44 | $250.31 - $311.88 |
| Q3 2022 | 6,895,357 | $1,841,060 | $212.38 | $193.65 - $283.44 |
| Q2 2022 | 6,876,881 | $1,402,471 | $204.43 | $187.16 - $225.50 |
| Q1 2022 | 7,208,906 | $1,518,196 | $217.46 | $192.67 - $249.00 |
| Q4 2021 | 7,011,506 | $1,682,201 | $257.12 | $221.72 - $290.76 |
| Q3 2021 | 6,903,536 | $1,953,632 | $327.75 | $282.64 - $372.12 |
| Q2 2021 | 6,680,040 | $2,313,097 | $302.94 | $257.03 - $468.55 |
| Q1 2021 | 6,672,533 | $1,866,641 | $269.69 | $238.40 - $296.38 |
| Q4 2020 | 6,992,015 | $1,712,065 | $259.08 | $223.25 - $363.92 |
| Q3 2020 | 7,523,696 | $2,134,322 | $278.91 | $261.87 - $312.00 |
| Q2 2020 | 7,836,873 | $2,096,755 | $300.59 | $257.60 - $350.24 |
| Q1 2020 | 8,262,242 | $2,614,008 | $303.47 | $262.25 - $374.99 |
| Q4 2019 | 8,232,187 | $2,442,737 | $277.46 | $219.70 - $318.00 |
| Q3 2019 | 8,440,419 | $1,965,098 | $232.85 | $215.78 - $246.99 |
| Q2 2019 | 8,764,575 | $2,049,771 | $230.90 | $219.20 - $245.35 |
| Q1 2019 | 8,754,893 | $2,069,482 | $314.89 | $216.12 - $344.00 |
| Q4 2018 | 8,781,192 | $2,642,436 | $319.14 | $278.46 - $358.41 |
| Q3 2018 | 8,844,835 | $3,124,965 | $344.30 | $288.13 - $388.67 |
| Q2 2018 | 8,900,550 | $2,583,279 | $281.15 | $249.17 - $310.91 |
| Q1 2018 | 8,746,056 | $2,394,851 | $310.41 | $259.76 - $370.57 |
| Q4 2017 | 9,483,601 | $3,021,189 | $320.80 | $301.81 - $348.84 |
| Q3 2017 | 9,669,416 | $3,027,694 | $296.11 | $269.50 - $330.00 |
| Q2 2017 | 9,721,312 | $2,637,973 | $264.42 | $244.28 - $291.90 |
| Q1 2017 | 9,580,383 | $2,619,469 | $282.75 | $260.50 - $301.42 |
| Q4 2016 | 9,360,881 | $2,654,589 | $296.43 | $268.00 - $329.83 |
| Q3 2016 | 9,067,064 | $2,838,269 | $296.18 | $240.07 - $333.65 |
| Q2 2016 | 8,833,348 | $2,136,074 | $263.54 | $223.02 - $292.69 |
| Q1 2016 | 8,928,855 | $2,324,346 | $264.15 | $242.07 - $301.02 |
| Q4 2015 | 9,461,617 | $2,898,561 | $287.35 | $254.00 - $311.65 |
| Q3 2015 | 9,485,627 | $2,767,996 | $330.23 | $265.00 - $412.24 |
| Q2 2015 | 9,502,785 | $3,838,619 | $401.33 | $368.88 - $432.88 |
| Q1 2015 | 9,785,190 | $4,131,697 | $394.14 | $334.40 - $480.18 |
| Q4 2014 | 10,105,791 | $3,430,422 | $323.51 | $290.85 - $361.93 |
| Q3 2014 | 9,862,872 | $3,262,740 | $329.72 | $298.31 - $349.00 |
| Q2 2014 | 9,638,717 | $3,039,183 | $300.97 | $272.02 - $322.25 |
| Q1 2014 | 9,546,674 | $2,920,042 | $317.43 | $270.62 - $358.89 |
| Q4 2013 | 10,154,282 | $2,840,675 | $258.65 | $221.07 - $298.82 |
| Q3 2013 | 10,258,778 | $2,469,904 | $223.81 | $203.55 - $248.95 |
| Q2 2013 | 10,169,353 | $2,188,440 | $213.68 | $191.80 - $242.64 |