Ticker: BIIB CUSIP: 09062X103 Class: COM
Note: Option positions (PUT/CALL) are excluded.
| Period | Shares | Value ($000) | Average Close | Price Range |
|---|---|---|---|---|
| Q4 2025 | 353,493 | $62,211 | $163.37 | $138.00 - $185.17 |
| Q3 2025 | 439,109 | $61,510 | $135.17 | $121.05 - $150.28 |
| Q2 2025 | 387,829 | $48,707 | $124.60 | $110.04 - $137.32 |
| Q1 2025 | 420,649 | $57,562 | $142.96 | $128.51 - $157.09 |
| Q4 2024 | 576,276 | $88,124 | $168.67 | $145.07 - $195.00 |
| Q3 2024 | 423,284 | $82,049 | $209.21 | $188.78 - $238.00 |
| Q2 2024 | 94,577 | $21,925 | $217.32 | $189.44 - $237.54 |
| Q1 2024 | 104,945 | $22,629 | $234.20 | $211.02 - $268.30 |
| Q4 2023 | 129,093 | $32,757 | $245.62 | $220.86 - $269.43 |
| Q3 2023 | 235,810 | $60,606 | $267.47 | $251.85 - $287.60 |
| Q2 2023 | 166,465 | $47,418 | $297.86 | $273.39 - $319.76 |
| Q1 2023 | 280,828 | $78,079 | $276.70 | $254.80 - $295.90 |
| Q4 2022 | 126,608 | $35,060 | $282.44 | $250.31 - $311.88 |
| Q3 2022 | 126,486 | $33,771 | $212.38 | $193.65 - $283.44 |
| Q2 2022 | 141,894 | $28,938 | $204.43 | $187.16 - $225.50 |
| Q1 2022 | 165,989 | $34,957 | $217.46 | $192.67 - $249.00 |
| Q4 2021 | 154,328 | $37,055 | $257.12 | $221.72 - $290.76 |
| Q3 2021 | 157,737 | $44,650 | $327.75 | $282.64 - $372.12 |
| Q2 2021 | 230,001 | $79,643 | $302.94 | $257.03 - $468.55 |
| Q1 2021 | 232,125 | $64,937 | $269.69 | $238.40 - $296.38 |
| Q4 2020 | 489,121 | $119,766 | $259.08 | $223.25 - $363.92 |
| Q3 2020 | 591,724 | $167,860 | $278.91 | $261.87 - $312.00 |
| Q2 2020 | 504,900 | $135,086 | $300.59 | $257.60 - $350.24 |
| Q1 2020 | 503,407 | $159,268 | $303.47 | $262.25 - $374.99 |
| Q4 2019 | 889,071 | $263,814 | $277.46 | $219.70 - $318.00 |
| Q3 2019 | 935,510 | $217,806 | $232.85 | $215.78 - $246.99 |
| Q2 2019 | 836,087 | $195,535 | $230.90 | $219.20 - $245.35 |
| Q1 2019 | 702,048 | $165,950 | $314.89 | $216.12 - $344.00 |
| Q4 2018 | 689,208 | $207,397 | $319.14 | $278.46 - $358.41 |
| Q3 2018 | 266,679 | $94,220 | $344.30 | $288.13 - $388.67 |
| Q2 2018 | 477,812 | $138,680 | $281.15 | $249.17 - $310.91 |
| Q1 2018 | 497,557 | $136,242 | $310.41 | $259.76 - $370.57 |
| Q4 2017 | 540,608 | $172,222 | $320.80 | $301.81 - $348.84 |
| Q3 2017 | 578,635 | $181,182 | $296.11 | $269.50 - $330.00 |
| Q2 2017 | 688,495 | $186,830 | $264.42 | $244.28 - $291.90 |
| Q1 2017 | 732,845 | $200,374 | $282.75 | $260.50 - $301.42 |
| Q4 2016 | 746,163 | $211,597 | $296.43 | $268.00 - $329.83 |
| Q3 2016 | 788,583 | $246,850 | $296.18 | $240.07 - $333.65 |
| Q2 2016 | 817,424 | $197,669 | $263.54 | $223.02 - $292.69 |
| Q1 2016 | 785,214 | $204,406 | $264.15 | $242.07 - $301.02 |
| Q4 2015 | 674,071 | $206,502 | $287.35 | $254.00 - $311.65 |
| Q3 2015 | 716,186 | $208,990 | $330.23 | $265.00 - $412.24 |
| Q2 2015 | 765,954 | $309,400 | $401.33 | $368.88 - $432.88 |
| Q1 2015 | 797,374 | $336,683 | $394.14 | $334.40 - $480.18 |
| Q4 2014 | 830,694 | $281,980 | $323.51 | $290.85 - $361.93 |
| Q3 2014 | 857,774 | $283,760 | $329.72 | $298.31 - $349.00 |
| Q2 2014 | 914,122 | $288,232 | $300.97 | $272.02 - $322.25 |
| Q1 2014 | 903,386 | $276,318 | $317.43 | $270.62 - $358.89 |
| Q4 2013 | 902,491 | $252,472 | $258.65 | $221.07 - $298.82 |
| Q3 2013 | 916,521 | $220,661 | $223.81 | $203.55 - $248.95 |
| Q2 2013 | 909,210 | $195,662 | $213.68 | $191.80 - $242.64 |