Ticker: BIIB CUSIP: 09062X103 Class: COM
Note: Option positions (PUT/CALL) are excluded.
| Period | Shares | Value ($000) | Average Close | Price Range |
|---|---|---|---|---|
| Q4 2025 | 503,832 | $88,838 | $163.37 | $138.00 - $185.17 |
| Q3 2025 | 447,518 | $62,594 | $135.17 | $121.05 - $150.28 |
| Q2 2025 | 443,269 | $55,615 | $124.60 | $110.04 - $137.32 |
| Q1 2025 | 484,029 | $65,999 | $142.96 | $128.51 - $157.09 |
| Q4 2024 | 441,001 | $67,200 | $168.67 | $145.07 - $195.00 |
| Q3 2024 | 414,396 | $80,269 | $209.21 | $188.78 - $238.00 |
| Q2 2024 | 378,437 | $87,657 | $217.32 | $189.44 - $237.54 |
| Q1 2024 | 398,842 | $85,983 | $234.20 | $211.02 - $268.30 |
| Q4 2023 | 325,608 | $84,220 | $245.62 | $220.86 - $269.43 |
| Q3 2023 | 272,634 | $70,081 | $267.47 | $251.85 - $287.60 |
| Q2 2023 | 283,509 | $80,678 | $297.86 | $273.39 - $319.76 |
| Q1 2023 | 250,080 | $69,539 | $276.70 | $254.80 - $295.90 |
| Q4 2022 | 281,938 | $77,636 | $282.44 | $250.31 - $311.88 |
| Q3 2022 | 170,183 | $45,443 | $212.38 | $193.65 - $283.44 |
| Q2 2022 | 206,332 | $42,395 | $204.43 | $187.16 - $225.50 |
| Q1 2022 | 166,261 | $35,123 | $217.46 | $192.67 - $249.00 |
| Q4 2021 | 156,227 | $37,575 | $257.12 | $221.72 - $290.76 |
| Q3 2021 | 155,827 | $44,320 | $327.75 | $282.64 - $372.12 |
| Q2 2021 | 174,067 | $60,234 | $302.94 | $257.03 - $468.55 |
| Q1 2021 | 263,034 | $73,241 | $269.69 | $238.40 - $296.38 |
| Q4 2020 | 269,942 | $65,775 | $259.08 | $223.25 - $363.92 |
| Q3 2020 | 231,560 | $65,691 | $278.91 | $261.87 - $312.00 |
| Q2 2020 | 271,119 | $72,531 | $300.59 | $257.60 - $350.24 |
| Q1 2020 | 193,127 | $60,972 | $303.47 | $262.25 - $374.99 |
| Q4 2019 | 343,356 | $101,066 | $277.46 | $219.70 - $318.00 |
| Q3 2019 | 265,320 | $61,773 | $232.85 | $215.78 - $246.99 |
| Q2 2019 | 267,364 | $62,530 | $230.90 | $219.20 - $245.35 |
| Q1 2019 | 311,748 | $73,691 | $314.89 | $216.12 - $344.00 |
| Q4 2018 | 219,754 | $66,101 | $319.14 | $278.46 - $358.41 |
| Q3 2018 | 223,610 | $79,002 | $344.30 | $288.13 - $388.67 |
| Q2 2018 | 197,191 | $57,232 | $281.15 | $249.17 - $310.91 |
| Q1 2018 | 364,100 | $99,684 | $310.41 | $259.76 - $370.57 |
| Q4 2017 | 328,957 | $104,793 | $320.80 | $301.81 - $348.84 |
| Q3 2017 | 345,740 | $108,258 | $296.11 | $269.50 - $330.00 |
| Q2 2017 | 302,924 | $82,204 | $264.42 | $244.28 - $291.90 |
| Q1 2017 | 282,012 | $76,958 | $282.75 | $260.50 - $301.42 |
| Q4 2016 | 189,889 | $53,848 | $296.43 | $268.00 - $329.83 |
| Q3 2016 | 175,427 | $54,696 | $296.18 | $240.07 - $333.65 |
| Q2 2016 | 171,759 | $41,455 | $263.54 | $223.02 - $292.69 |
| Q1 2016 | 171,808 | $44,532 | $264.15 | $242.07 - $301.02 |
| Q4 2015 | 235,977 | $72,353 | $287.35 | $254.00 - $311.65 |
| Q3 2015 | 363,353 | $105,605 | $330.23 | $265.00 - $412.24 |
| Q2 2015 | 369,959 | $149,200 | $401.33 | $368.88 - $432.88 |
| Q1 2015 | 393,654 | $166,495 | $394.14 | $334.40 - $480.18 |
| Q4 2014 | 366,885 | $124,616 | $323.51 | $290.85 - $361.93 |
| Q3 2014 | 317,042 | $104,864 | $329.72 | $298.31 - $349.00 |
| Q2 2014 | 350,446 | $110,569 | $300.97 | $272.02 - $322.25 |
| Q1 2014 | 332,746 | $101,474 | $317.43 | $270.62 - $358.89 |
| Q4 2013 | 300,849 | $84,125 | $258.65 | $221.07 - $298.82 |
| Q3 2013 | 278,093 | $67,069 | $223.81 | $203.55 - $248.95 |
| Q2 2013 | 270,470 | $58,045 | $213.68 | $191.80 - $242.64 |
| Q1 2013 | 184,701 | $35,606 | $161.63 | $139.72 - $192.92 |
| Q4 2012 | 193,454 | $28,340 | — | — |
| Q3 2012 | 111,346 | $16,614 | — | — |
| Q2 2012 | 67,876 | $9,799 | — | — |
| Q1 2012 | 123,715 | $15,588 | — | — |