Ticker: BIIB CUSIP: 09062X103 Class: COM
Note: Option positions (PUT/CALL) are excluded.
| Period | Shares | Value ($000) | Average Close | Price Range |
|---|---|---|---|---|
| Q4 2025 | 792,071 | $139 | $163.37 | $138.00 - $185.17 |
| Q3 2025 | 965,457 | $135 | $135.17 | $121.05 - $150.28 |
| Q2 2025 | 833,927 | $105 | $124.60 | $110.04 - $137.32 |
| Q1 2025 | 1,151,192 | $158 | $142.96 | $128.51 - $157.09 |
| Q4 2024 | 1,933,716 | $296 | $168.67 | $145.07 - $195.00 |
| Q3 2024 | 1,912,546 | $371 | $209.21 | $188.78 - $238.00 |
| Q2 2024 | 2,011,411 | $466 | $217.32 | $189.44 - $237.54 |
| Q1 2024 | 1,589,629 | $343 | $234.20 | $211.02 - $268.30 |
| Q4 2023 | 1,508,346 | $390 | $245.62 | $220.86 - $269.43 |
| Q3 2023 | 1,163,530 | $299 | $267.47 | $251.85 - $287.60 |
| Q2 2023 | 1,128,642 | $321 | $297.86 | $273.39 - $319.76 |
| Q1 2023 | 2,088,356 | $581 | $276.70 | $254.80 - $295.90 |
| Q4 2022 | 1,396,513 | $387 | $282.44 | $250.31 - $311.88 |
| Q3 2022 | 1,534,515 | $409,717 | $212.38 | $193.65 - $283.44 |
| Q2 2022 | 1,030,931 | $210,248 | $204.43 | $187.16 - $225.50 |
| Q1 2022 | 1,075,969 | $226,599 | $217.46 | $192.67 - $249.00 |
| Q4 2021 | 1,131,357 | $271,435 | $257.12 | $221.72 - $290.76 |
| Q3 2021 | 1,784,136 | $504,893 | $327.75 | $282.64 - $372.12 |
| Q2 2021 | 1,612,563 | $558,382 | $302.94 | $257.03 - $468.55 |
| Q1 2021 | 1,777,171 | $497,164 | $269.69 | $238.40 - $296.38 |
| Q4 2020 | 1,687,298 | $413,152 | $259.08 | $223.25 - $363.92 |
| Q3 2020 | 1,371,281 | $389,005 | $278.91 | $261.87 - $312.00 |
| Q2 2020 | 1,207,878 | $323,168 | $300.59 | $257.60 - $350.24 |
| Q1 2020 | 4,284,557 | $1,355,548 | $303.47 | $262.25 - $374.99 |
| Q4 2019 | 2,011,912 | $596,995 | $277.46 | $219.70 - $318.00 |
| Q3 2019 | 1,104,654 | $257,186 | $232.85 | $215.78 - $246.99 |
| Q2 2019 | 1,097,770 | $256,735 | $230.90 | $219.20 - $245.35 |
| Q1 2019 | 1,051,889 | $248,646 | $314.89 | $216.12 - $344.00 |
| Q4 2018 | 1,284,006 | $386,383 | $319.14 | $278.46 - $358.41 |
| Q3 2018 | 1,783,142 | $630,002 | $344.30 | $288.13 - $388.67 |
| Q2 2018 | 1,973,631 | $572,826 | $281.15 | $249.17 - $310.91 |
| Q1 2018 | 4,022,099 | $1,101,332 | $310.41 | $259.76 - $370.57 |
| Q4 2017 | 8,534,311 | $2,718,776 | $320.80 | $301.81 - $348.84 |
| Q3 2017 | 10,681,378 | $3,344,553 | $296.11 | $269.50 - $330.00 |
| Q2 2017 | 8,948,782 | $2,428,341 | $264.42 | $244.28 - $291.90 |
| Q1 2017 | 8,118,191 | $2,219,676 | $282.75 | $260.50 - $301.42 |
| Q4 2016 | 8,718,233 | $2,472,317 | $296.43 | $268.00 - $329.83 |
| Q3 2016 | 7,610,028 | $2,382,167 | $296.18 | $240.07 - $333.65 |
| Q2 2016 | 6,366,152 | $1,539,463 | $263.54 | $223.02 - $292.69 |
| Q1 2016 | 8,119,909 | $2,113,775 | $264.15 | $242.07 - $301.02 |
| Q4 2015 | 6,360,432 | $1,948,518 | $287.35 | $254.00 - $311.65 |
| Q3 2015 | 6,027,086 | $1,758,764 | $330.23 | $265.00 - $412.24 |
| Q2 2015 | 10,473,787 | $4,230,782 | $401.33 | $368.88 - $432.88 |
| Q1 2015 | 10,791,562 | $4,556,629 | $394.14 | $334.40 - $480.18 |
| Q4 2014 | 12,176,548 | $4,133,329 | $323.51 | $290.85 - $361.93 |
| Q3 2014 | 12,791,052 | $4,231,408 | $329.72 | $298.31 - $349.00 |
| Q2 2014 | 12,194,641 | $3,845,092 | $300.97 | $272.02 - $322.25 |
| Q1 2014 | 12,178,149 | $3,724,930 | $317.43 | $270.62 - $358.89 |
| Q4 2013 | 11,651,138 | $3,259,406 | $258.65 | $221.07 - $298.82 |
| Q3 2013 | 10,827,196 | $2,606,756 | $223.81 | $203.55 - $248.95 |
| Q2 2013 | 10,948,117 | $2,356,035 | $213.68 | $191.80 - $242.64 |