Ticker: BIIB CUSIP: 09062X103 Class: COM
Note: Option positions (PUT/CALL) are excluded.
| Period | Shares | Value ($000) | Average Close | Price Range |
|---|---|---|---|---|
| Q4 2025 | 4,199,399 | $736,435 | $163.37 | $138.00 - $185.17 |
| Q3 2025 | 4,068,781 | $567,740 | $135.17 | $121.05 - $150.28 |
| Q2 2025 | 3,918,150 | $490,089 | $124.60 | $110.04 - $137.32 |
| Q1 2025 | 3,846,864 | $524,768 | $142.96 | $128.51 - $157.09 |
| Q4 2024 | 3,695,476 | $563,709 | $168.67 | $145.07 - $195.00 |
| Q3 2024 | 3,613,020 | $698,062 | $209.21 | $188.78 - $238.00 |
| Q2 2024 | 3,565,965 | $824,546 | $217.32 | $189.44 - $237.54 |
| Q1 2024 | 3,409,674 | $733,409 | $234.20 | $211.02 - $268.30 |
| Q4 2023 | 3,309,317 | $854,138 | $245.62 | $220.86 - $269.43 |
| Q3 2023 | 3,236,887 | $830,168 | $267.47 | $251.85 - $287.60 |
| Q2 2023 | 3,183,679 | $904,582 | $297.86 | $273.39 - $319.76 |
| Q1 2023 | 3,102,735 | $860,775 | $276.70 | $254.80 - $295.90 |
| Q4 2022 | 3,342,330 | $924 | $282.44 | $250.31 - $311.88 |
| Q3 2022 | 3,299,475 | $880,047 | $212.38 | $193.65 - $283.44 |
| Q2 2022 | 3,245,523 | $660,831 | $204.43 | $187.16 - $225.50 |
| Q1 2022 | 2,806,664 | $589,670 | $217.46 | $192.67 - $249.00 |
| Q4 2021 | 2,745,331 | $656,969 | $257.12 | $221.72 - $290.76 |
| Q3 2021 | 2,775,266 | $783,496 | $327.75 | $282.64 - $372.12 |
| Q2 2021 | 2,893,750 | $1,000,095 | $302.94 | $257.03 - $468.55 |
| Q1 2021 | 2,796,511 | $780,818 | $269.69 | $238.40 - $296.38 |
| Q4 2020 | 2,759,498 | $674,210 | $259.08 | $223.25 - $363.92 |
| Q3 2020 | 2,889,978 | $818,543 | $278.91 | $261.87 - $312.00 |
| Q2 2020 | 3,039,406 | $812,144 | $300.59 | $257.60 - $350.24 |
| Q1 2020 | 3,372,294 | $1,065,558 | $303.47 | $262.25 - $374.99 |
| Q4 2019 | 3,302,637 | $978,449 | $277.46 | $219.70 - $318.00 |
| Q3 2019 | 3,335,552 | $775,704 | $232.85 | $215.78 - $246.99 |
| Q2 2019 | 3,286,582 | $767,628 | $230.90 | $219.20 - $245.35 |
| Q1 2019 | 3,043,191 | $718,262 | $314.89 | $216.12 - $344.00 |
| Q4 2018 | 2,713,577 | $815,190 | $319.14 | $278.46 - $358.41 |
| Q3 2018 | 2,569,113 | $906,033 | $344.30 | $288.13 - $388.67 |
| Q2 2018 | 2,622,820 | $759,784 | $281.15 | $249.17 - $310.91 |
| Q1 2018 | 2,594,399 | $708,837 | $310.41 | $259.76 - $370.57 |
| Q4 2017 | 2,443,559 | $776,943 | $320.80 | $301.81 - $348.84 |
| Q3 2017 | 2,418,806 | $756,055 | $296.11 | $269.50 - $330.00 |
| Q2 2017 | 2,419,526 | $655,568 | $264.42 | $244.28 - $291.90 |
| Q1 2017 | 2,372,175 | $647,777 | $282.75 | $260.50 - $301.42 |
| Q4 2016 | 2,222,343 | $629,539 | $296.43 | $268.00 - $329.83 |
| Q3 2016 | 2,123,915 | $663,908 | $296.18 | $240.07 - $333.65 |
| Q2 2016 | 2,022,099 | $488,224 | $263.54 | $223.02 - $292.69 |
| Q1 2016 | 1,995,002 | $518,399 | $264.15 | $242.07 - $301.02 |
| Q4 2015 | 1,919,038 | $586,749 | $287.35 | $254.00 - $311.65 |
| Q3 2015 | 1,951,867 | $568,504 | $330.23 | $265.00 - $412.24 |
| Q2 2015 | 1,929,721 | $778,016 | $401.33 | $368.88 - $432.88 |
| Q1 2015 | 1,916,624 | $808,066 | $394.14 | $334.40 - $480.18 |
| Q4 2014 | 1,861,665 | $631,165 | $323.51 | $290.85 - $361.93 |
| Q3 2014 | 1,783,743 | $589,350 | $329.72 | $298.31 - $349.00 |
| Q2 2014 | 1,797,312 | $566,384 | $300.97 | $272.02 - $322.25 |
| Q1 2014 | 1,807,617 | $552,668 | $317.43 | $270.62 - $358.89 |
| Q4 2013 | 1,706,886 | $477,359 | $258.65 | $221.07 - $298.82 |
| Q3 2013 | 1,680,389 | $404,470 | $223.81 | $203.55 - $248.95 |
| Q2 2013 | 1,627,791 | $350,228 | $213.68 | $191.80 - $242.64 |