Ticker: BIIB CUSIP: 09062X103 Class: COM
Note: Option positions (PUT/CALL) are excluded.
| Period | Shares | Value ($000) | Average Close | Price Range |
|---|---|---|---|---|
| Q4 2025 | 141,374 | $24,880 | $163.37 | $138.00 - $185.17 |
| Q3 2025 | 229,156 | $32,100 | $135.17 | $121.05 - $150.28 |
| Q2 2025 | 229,010 | $28,761 | $124.60 | $110.04 - $137.32 |
| Q1 2025 | 588,117 | $80,478 | $142.96 | $128.51 - $157.09 |
| Q4 2024 | 394,391 | $60,310 | $168.67 | $145.07 - $195.00 |
| Q3 2024 | 374,747 | $71,787 | $209.21 | $188.78 - $238.00 |
| Q2 2024 | 388,470 | $90,055 | $217.32 | $189.44 - $237.54 |
| Q1 2024 | 385,583 | $83,143 | $234.20 | $211.02 - $268.30 |
| Q4 2023 | 498,349 | $128,958 | $245.62 | $220.86 - $269.43 |
| Q3 2023 | 628,534 | $161,540 | $267.47 | $251.85 - $287.60 |
| Q2 2023 | 442,792 | $126,129 | $297.86 | $273.39 - $319.76 |
| Q1 2023 | 425,686 | $118,353 | $276.70 | $254.80 - $295.90 |
| Q4 2022 | 422,084 | $116,884 | $282.44 | $250.31 - $311.88 |
| Q3 2022 | 409,242 | $109,267 | $212.38 | $193.65 - $283.44 |
| Q2 2022 | 412,849 | $84,197 | $204.43 | $187.16 - $225.50 |
| Q1 2022 | 415,382 | $87,480 | $217.46 | $192.67 - $249.00 |
| Q4 2021 | 461,482 | $110,719 | $257.12 | $221.72 - $290.76 |
| Q3 2021 | 486,295 | $137,615 | $327.75 | $282.64 - $372.12 |
| Q2 2021 | 471,300 | $163,197 | $302.94 | $257.03 - $468.55 |
| Q1 2021 | 530,279 | $148,347 | $269.69 | $238.40 - $296.38 |
| Q4 2020 | 473,852 | $116,028 | $259.08 | $223.25 - $363.92 |
| Q3 2020 | 594,297 | $168,589 | $278.91 | $261.87 - $312.00 |
| Q2 2020 | 577,273 | $162,103 | $300.59 | $257.60 - $350.24 |
| Q1 2020 | 646,072 | $204,403 | $303.47 | $262.25 - $374.99 |
| Q4 2019 | 589,130 | $174,812 | $277.46 | $219.70 - $318.00 |
| Q3 2019 | 572,601 | $133,315 | $232.85 | $215.78 - $246.99 |
| Q2 2019 | 1,106,222 | $258,711 | $230.90 | $219.20 - $245.35 |
| Q1 2019 | 1,076,953 | $254,571 | $314.89 | $216.12 - $344.00 |
| Q4 2018 | 1,192,716 | $358,912 | $319.14 | $278.46 - $358.41 |
| Q3 2018 | 1,152,626 | $407,235 | $344.30 | $288.13 - $388.67 |
| Q2 2018 | 1,148,984 | $333,481 | $281.15 | $249.17 - $310.91 |
| Q1 2018 | 1,142,696 | $312,894 | $310.41 | $259.76 - $370.57 |
| Q4 2017 | 1,438,020 | $458,114 | $320.80 | $301.81 - $348.84 |
| Q3 2017 | 1,392,045 | $435,870 | $296.11 | $269.50 - $330.00 |
| Q2 2017 | 1,416,237 | $384,309 | $264.42 | $244.28 - $291.90 |
| Q1 2017 | 1,763,224 | $482,075 | $282.75 | $260.50 - $301.42 |
| Q4 2016 | 1,788,919 | $507,322 | $296.43 | $268.00 - $329.83 |
| Q3 2016 | 1,900,080 | $594,733 | $296.18 | $240.07 - $333.65 |
| Q2 2016 | 1,965,827 | $475,375 | $263.54 | $223.02 - $292.69 |
| Q1 2016 | 2,067,319 | $538,170 | $264.15 | $242.07 - $301.02 |
| Q4 2015 | 2,115,574 | $648,119 | $287.35 | $254.00 - $311.65 |
| Q3 2015 | 2,374,911 | $693,034 | $330.23 | $265.00 - $412.24 |
| Q2 2015 | 2,226,442 | $899,350 | $401.33 | $368.88 - $432.88 |
| Q1 2015 | 2,293,607 | $968,447 | $394.14 | $334.40 - $480.18 |
| Q4 2014 | 2,126,484 | $721,838 | $323.51 | $290.85 - $361.93 |
| Q3 2014 | 2,024,099 | $669,587 | $329.72 | $298.31 - $349.00 |
| Q2 2014 | 2,281,298 | $719,308 | $300.97 | $272.02 - $322.25 |
| Q1 2014 | 2,282,453 | $698,132 | $317.43 | $270.62 - $358.89 |
| Q4 2013 | 1,854,328 | $518,747 | $258.65 | $221.07 - $298.82 |
| Q3 2013 | 1,678,341 | $404,076 | $223.81 | $203.55 - $248.95 |
| Q2 2013 | 1,607,249 | $345,881 | $213.68 | $191.80 - $242.64 |