Ticker: BIIB CUSIP: 09062X103 Class: COM
Note: Option positions (PUT/CALL) are excluded.
| Period | Shares | Value ($000) | Average Close | Price Range |
|---|---|---|---|---|
| Q4 2025 | 811,106 | $142,747 | $163.37 | $138.00 - $185.17 |
| Q3 2025 | 884,701 | $123,929 | $135.17 | $121.05 - $150.28 |
| Q2 2025 | 904,054 | $113,540 | $124.60 | $110.04 - $137.32 |
| Q1 2025 | 953,811 | $130,520 | $142.96 | $128.51 - $157.09 |
| Q4 2024 | 974,795 | $149,066 | $168.67 | $145.07 - $195.00 |
| Q3 2024 | 1,003,135 | $194,448 | $209.21 | $188.78 - $238.00 |
| Q2 2024 | 1,247,615 | $289,222 | $217.32 | $189.44 - $237.54 |
| Q1 2024 | 1,376,002 | $296,707 | $234.20 | $211.02 - $268.30 |
| Q4 2023 | 1,389,698 | $359,612 | $245.62 | $220.86 - $269.43 |
| Q3 2023 | 1,430,132 | $367,558 | $267.47 | $251.85 - $287.60 |
| Q2 2023 | 1,469,495 | $418,586 | $297.86 | $273.39 - $319.76 |
| Q1 2023 | 1,474,178 | $409,865 | $276.70 | $254.80 - $295.90 |
| Q4 2022 | 1,512,956 | $418,968 | $282.44 | $250.31 - $311.88 |
| Q3 2022 | 1,506,789 | $402,312 | $212.38 | $193.65 - $283.44 |
| Q2 2022 | 1,541,344 | $314,344 | $204.43 | $187.16 - $225.50 |
| Q1 2022 | 1,437,211 | $302,678 | $217.46 | $192.67 - $249.00 |
| Q4 2021 | 1,465,307 | $351,556 | $257.12 | $221.72 - $290.76 |
| Q3 2021 | 1,609,799 | $455,556 | $327.75 | $282.64 - $372.12 |
| Q2 2021 | 1,765,832 | $611,454 | $302.94 | $257.03 - $468.55 |
| Q1 2021 | 2,177,098 | $609,041 | $269.69 | $238.40 - $296.38 |
| Q4 2020 | 2,146,092 | $525,493 | $259.08 | $223.25 - $363.92 |
| Q3 2020 | 2,311,413 | $655,704 | $278.91 | $261.87 - $312.00 |
| Q2 2020 | 2,319,052 | $620,462 | $300.59 | $257.60 - $350.24 |
| Q1 2020 | 2,412,860 | $763,380 | $303.47 | $262.25 - $374.99 |
| Q4 2019 | 2,117,304 | $628,268 | $277.46 | $219.70 - $318.00 |
| Q3 2019 | 1,891,379 | $440,351 | $232.85 | $215.78 - $246.99 |
| Q2 2019 | 1,727,485 | $404,008 | $230.90 | $219.20 - $245.35 |
| Q1 2019 | 1,888,349 | $446,368 | $314.89 | $216.12 - $344.00 |
| Q4 2018 | 2,236,167 | $672,907 | $319.14 | $278.46 - $358.41 |
| Q3 2018 | 2,302,062 | $813,342 | $344.30 | $288.13 - $388.67 |
| Q2 2018 | 2,362,136 | $685,588 | $281.15 | $249.17 - $310.91 |
| Q1 2018 | 2,289,468 | $626,900 | $310.41 | $259.76 - $370.57 |
| Q4 2017 | 2,390,527 | $761,552 | $320.80 | $301.81 - $348.84 |
| Q3 2017 | 2,325,987 | $728,314 | $296.11 | $269.50 - $330.00 |
| Q2 2017 | 1,875,780 | $509,011 | $264.42 | $244.28 - $291.90 |
| Q1 2017 | 2,038,169 | $557,275 | $282.75 | $260.50 - $301.42 |
| Q4 2016 | 2,020,856 | $573,074 | $296.43 | $268.00 - $329.83 |
| Q3 2016 | 2,182,350 | $683,141 | $296.18 | $240.07 - $333.65 |
| Q2 2016 | 2,354,393 | $569,340 | $263.54 | $223.02 - $292.69 |
| Q1 2016 | 2,692,260 | $700,849 | $264.15 | $242.07 - $301.02 |
| Q4 2015 | 2,824,072 | $865,155 | $287.35 | $254.00 - $311.65 |
| Q3 2015 | 3,212,715 | $937,821 | $330.23 | $265.00 - $412.24 |
| Q2 2015 | 3,100,414 | $1,252,383 | $401.33 | $368.88 - $432.88 |
| Q1 2015 | 3,216,860 | $1,358,806 | $394.14 | $334.40 - $480.18 |
| Q4 2014 | 3,358,853 | $1,140,554 | $323.51 | $290.85 - $361.93 |
| Q3 2014 | 3,331,047 | $1,101,943 | $329.72 | $298.31 - $349.00 |
| Q2 2014 | 3,210,800 | $1,012,396 | $300.97 | $272.02 - $322.25 |
| Q1 2014 | 3,224,651 | $986,322 | $317.43 | $270.62 - $358.89 |
| Q4 2013 | 2,949,248 | $824,527 | $258.65 | $221.07 - $298.82 |
| Q3 2013 | 3,052,165 | $734,840 | $223.81 | $203.55 - $248.95 |
| Q2 2013 | 2,812,720 | $605,296 | $213.68 | $191.80 - $242.64 |