Ticker: BIIB CUSIP: 09062X103 Class: COM
Note: Option positions (PUT/CALL) are excluded.
| Period | Shares | Value ($000) | Average Close | Price Range |
|---|---|---|---|---|
| Q4 2025 | 508,067 | $89,415 | $163.37 | $138.00 - $185.17 |
| Q3 2025 | 395,938 | $55,463 | $135.17 | $121.05 - $150.28 |
| Q2 2025 | 394,999 | $49,608 | $124.60 | $110.04 - $137.32 |
| Q1 2025 | 366,181 | $50,108 | $142.96 | $128.51 - $157.09 |
| Q4 2021 | 164,508 | $39,468,760 | $257.12 | $221.72 - $290.76 |
| Q3 2021 | 98,160 | $27,778,298 | $327.75 | $282.64 - $372.12 |
| Q2 2021 | 142,549 | $49,360,442 | $302.94 | $257.03 - $468.55 |
| Q1 2021 | 114,952 | $32,157,822 | $269.69 | $238.40 - $296.38 |
| Q4 2020 | 112,226 | $27,479,658 | $259.08 | $223.25 - $363.92 |
| Q3 2020 | 174,051 | $49,374,788 | $278.91 | $261.87 - $312.00 |
| Q2 2020 | 195,076 | $52,192,584 | $300.59 | $257.60 - $350.24 |
| Q1 2020 | 136,212 | $43,094,753 | $303.47 | $262.25 - $374.99 |
| Q4 2019 | 148,441 | $44,046,898 | $277.46 | $219.70 - $318.00 |
| Q3 2019 | 455,070 | $105,949,397 | $232.85 | $215.78 - $246.99 |
| Q2 2019 | 186,764 | $43,678,497 | $230.90 | $219.20 - $245.35 |
| Q1 2019 | 288,294 | $68,146,936 | $314.89 | $216.12 - $344.00 |
| Q4 2018 | 189,203 | $56,934,967 | $319.14 | $278.46 - $358.41 |
| Q3 2018 | 225,933 | $79,824,388 | $344.30 | $288.13 - $388.67 |
| Q2 2018 | 214,850 | $62,358,064 | $281.15 | $249.17 - $310.91 |
| Q1 2018 | 354,997 | $97,205,278 | $310.41 | $259.76 - $370.57 |
| Q4 2017 | 273,527 | $87,137,496 | $320.80 | $301.81 - $348.84 |
| Q3 2017 | 338,458 | $105,977,969 | $296.11 | $269.50 - $330.00 |
| Q2 2017 | 268,121 | $72,757,310 | $264.42 | $244.28 - $291.90 |
| Q1 2017 | 326,511 | $89,274,643 | $282.75 | $260.50 - $301.42 |
| Q4 2016 | 189,076 | $53,618,169 | $296.43 | $268.00 - $329.83 |
| Q3 2016 | 152,259 | $47,661,636 | $296.18 | $240.07 - $333.65 |
| Q2 2016 | 118,384 | $28,627,619 | $263.54 | $223.02 - $292.69 |
| Q1 2016 | 269,674 | $70,201,538 | $264.15 | $242.07 - $301.02 |
| Q4 2015 | 94,677 | $29,004,300 | $287.35 | $254.00 - $311.65 |
| Q3 2015 | 272,627 | $79,555,284 | $330.23 | $265.00 - $412.24 |
| Q2 2015 | 152,147 | $61,458,259 | $401.33 | $368.88 - $432.88 |
| Q1 2015 | 235,733 | $99,535,901 | $394.14 | $334.40 - $480.18 |
| Q4 2014 | 294,939 | $100,117,046 | $323.51 | $290.85 - $361.93 |
| Q3 2014 | 245,293 | $81,145,374 | $329.72 | $298.31 - $349.00 |
| Q2 2014 | 144,623 | $45,601,077 | $300.97 | $272.02 - $322.25 |
| Q1 2014 | 253,842 | $72,883,100 | $317.43 | $270.62 - $358.89 |
| Q4 2013 | 438,979 | $122,804,000 | $258.65 | $221.07 - $298.82 |
| Q3 2013 | 433,408 | $104,347,000 | $223.81 | $203.55 - $248.95 |
| Q2 2013 | 188,081 | $40,475,000 | $213.68 | $191.80 - $242.64 |