Ticker: BIIB CUSIP: 09062X103 Class: COM
Note: Option positions (PUT/CALL) are excluded.
| Period | Shares | Value ($000) | Average Close | Price Range |
|---|---|---|---|---|
| Q4 2025 | 2,447 | $431 | $163.37 | $138.00 - $185.17 |
| Q3 2025 | 2,285 | $320 | $135.17 | $121.05 - $150.28 |
| Q2 2025 | 2,050 | $257 | $124.60 | $110.04 - $137.32 |
| Q1 2025 | 2,433 | $333 | $142.96 | $128.51 - $157.09 |
| Q4 2024 | 2,414 | $369 | $168.67 | $145.07 - $195.00 |
| Q3 2024 | 2,308 | $447 | $209.21 | $188.78 - $238.00 |
| Q2 2024 | 2,229 | $517 | $217.32 | $189.44 - $237.54 |
| Q1 2024 | 2,177 | $469 | $234.20 | $211.02 - $268.30 |
| Q4 2023 | 2,303 | $596 | $245.62 | $220.86 - $269.43 |
| Q3 2023 | 2,622 | $674 | $267.47 | $251.85 - $287.60 |
| Q2 2023 | 2,628 | $749 | $297.86 | $273.39 - $319.76 |
| Q1 2023 | 2,493 | $693 | $276.70 | $254.80 - $295.90 |
| Q4 2022 | 2,469 | $684 | $282.44 | $250.31 - $311.88 |
| Q3 2022 | 3,996 | $1,067 | $212.38 | $193.65 - $283.44 |
| Q2 2022 | 4,153 | $847 | $204.43 | $187.16 - $225.50 |
| Q1 2022 | 2,623 | $552 | $217.46 | $192.67 - $249.00 |
| Q4 2021 | 2,618 | $628 | $257.12 | $221.72 - $290.76 |
| Q3 2021 | 2,779 | $787 | $327.75 | $282.64 - $372.12 |
| Q2 2021 | 2,800 | $970 | $302.94 | $257.03 - $468.55 |
| Q1 2021 | 1,481 | $414 | $269.69 | $238.40 - $296.38 |
| Q4 2020 | 1,420 | $348 | $259.08 | $223.25 - $363.92 |
| Q3 2020 | 1,426 | $405 | $278.91 | $261.87 - $312.00 |
| Q2 2020 | 1,448 | $388 | $300.59 | $257.60 - $350.24 |
| Q1 2020 | 1,740 | $551 | $303.47 | $262.25 - $374.99 |
| Q4 2019 | 1,894 | $562 | $277.46 | $219.70 - $318.00 |
| Q3 2019 | 1,731 | $403 | $232.85 | $215.78 - $246.99 |
| Q2 2019 | 2,139 | $500 | $230.90 | $219.20 - $245.35 |
| Q1 2019 | 2,384 | $563 | $314.89 | $216.12 - $344.00 |
| Q4 2018 | 2,464 | $741 | $319.14 | $278.46 - $358.41 |
| Q3 2018 | 2,780 | $982 | $344.30 | $288.13 - $388.67 |
| Q2 2018 | 2,404 | $698 | $281.15 | $249.17 - $310.91 |
| Q1 2018 | 2,480 | $679 | $310.41 | $259.76 - $370.57 |
| Q4 2017 | 2,636 | $840 | $320.80 | $301.81 - $348.84 |
| Q3 2017 | 2,699 | $845 | $296.11 | $269.50 - $330.00 |
| Q2 2017 | 2,940 | $798 | $264.42 | $244.28 - $291.90 |
| Q1 2017 | 3,007 | $822 | $282.75 | $260.50 - $301.42 |
| Q4 2016 | 2,931 | $831 | $296.43 | $268.00 - $329.83 |
| Q3 2016 | 2,960 | $928 | $296.18 | $240.07 - $333.65 |
| Q2 2016 | 2,601 | $629 | $263.54 | $223.02 - $292.69 |
| Q1 2016 | 2,031 | $857 | $264.15 | $242.07 - $301.02 |
| Q4 2015 | 2,808 | $860 | $287.35 | $254.00 - $311.65 |
| Q3 2015 | 2,717 | $793 | $330.23 | $265.00 - $412.24 |
| Q2 2015 | 2,367 | $957 | $401.33 | $368.88 - $432.88 |
| Q1 2015 | 2,031 | $857 | $394.14 | $334.40 - $480.18 |
| Q4 2014 | 2,001 | $679 | $323.51 | $290.85 - $361.93 |
| Q3 2014 | 3,040 | $1,005 | $329.72 | $298.31 - $349.00 |
| Q2 2014 | 3,432 | $1,083 | $300.97 | $272.02 - $322.25 |
| Q1 2014 | 4,601 | $1,407 | $317.43 | $270.62 - $358.89 |
| Q4 2013 | 2,565 | $717 | $258.65 | $221.07 - $298.82 |
| Q3 2013 | 2,622 | $631 | $223.81 | $203.55 - $248.95 |
| Q2 2013 | 2,791 | $600 | $213.68 | $191.80 - $242.64 |
| Q1 2013 | 2,697 | $520 | $161.63 | $139.72 - $192.92 |
| Q4 2012 | 2,570 | $376 | — | — |
| Q3 2012 | 2,729 | $407 | — | — |
| Q2 2012 | 2,681 | $388 | — | — |
| Q1 2012 | 3,969 | $500 | — | — |
| Q4 2011 | 3,933 | $433 | — | — |
| Q3 2011 | 3,620 | $338 | — | — |
| Q2 2011 | 3,467 | $371 | — | — |
| Q1 2011 | 2,664 | $196 | — | — |
| Q4 2010 | 2,642 | $177 | — | — |
| Q3 2010 | 2,763 | $155 | — | — |
| Q2 2010 | 2,688 | $128 | — | — |
| Q1 2010 | 2,642 | $152 | — | — |
| Q4 2009 | 2,750 | $147 | — | — |
| Q3 2009 | 2,494 | $126 | — | — |
| Q2 2009 | 3,757 | $169 | — | — |
| Q1 2009 | 3,366 | $176 | — | — |