Biogen Inc. (BIIB) stock
BIIBNasdaqBiological Products, (No Diagnostic Substances)Fiscal year ends December 31
Financials through Q2 FY2026, quarter ended Jun 30, 2026Last filing: 10-Q on Oct 28, 2026Score 4/3061% above fair value
$253.62+3.97 (+1.59%)
Close on Oct 30, 2026Market cap $37.47BP/E 44.9Yield –
Price history
Biogen share prices for every month, newest first. Adjusted for stock splits, not for dividends.
Close, Oct 30, 2026
$253.62
+1.59% on the day
52-week range
$138.00 – $258.78
-2.0% from the high
Change over 52 weeks
+69.5%
From $149.61 on Oct 30, 2025
Average volume
1.16M
Shares a day, last 90 sessions
| Month | Open | High | Low | Close | Change | Volume |
|---|---|---|---|---|---|---|
| Oct 2026 | $225.50 | $258.78 | $215.73 | $253.62 | +12.28% | 29,398,130 |
| Sep 2026 | $218.11 | $230.49 | $208.93 | $225.88 | +4.26% | 21,434,604 |
| Aug 2026 | $203.34 | $222.85 | $199.58 | $216.65 | +6.75% | 15,969,168 |
| Jul 2026 | $215.25 | $219.02 | $186.03 | $202.95 | -6.07% | 31,696,903 |
| Jun 2026 | $194.50 | $219.72 | $184.90 | $216.06 | +10.23% | 24,236,744 |
| May 2026 | $189.28 | $205.97 | $185.44 | $196.00 | +3.55% | 22,252,016 |
| Apr 2026 | $183.16 | $195.98 | $168.64 | $189.28 | +3.25% | 28,537,258 |
| Mar 2026 | $190.22 | $192.99 | $171.37 | $183.33 | -4.43% | 21,908,968 |
| Feb 2026 | $179.30 | $202.41 | $176.19 | $191.82 | +6.63% | 27,602,943 |
| Jan 2026 | $175.37 | $190.20 | $160.36 | $179.89 | +2.22% | 31,240,350 |
| Dec 2025 | $180.15 | $183.15 | $168.56 | $175.99 | -3.35% | 49,728,817 |
| Nov 2025 | $153.60 | $185.17 | $148.51 | $182.09 | +18.03% | 38,479,651 |
| Oct 2025 | $140.82 | $160.20 | $138.00 | $154.27 | +10.13% | 40,402,521 |
| Sep 2025 | $133.55 | $150.28 | $133.53 | $140.08 | +5.94% | 35,341,503 |
| Aug 2025 | $128.96 | $142.32 | $124.56 | $132.22 | +3.30% | 30,545,798 |
| Jul 2025 | $124.94 | $137.84 | $121.05 | $128.00 | +1.92% | 29,440,280 |
| Jun 2025 | $129.59 | $136.84 | $123.21 | $125.59 | -3.24% | 26,465,191 |
| May 2025 | $120.37 | $132.94 | $115.25 | $129.79 | +7.19% | 38,069,260 |
| Apr 2025 | $136.80 | $137.32 | $110.04 | $121.08 | -11.52% | 37,659,403 |
| Mar 2025 | $140.41 | $157.09 | $134.71 | $136.84 | -2.60% | 37,149,041 |
| Feb 2025 | $142.81 | $147.00 | $128.51 | $140.50 | -2.38% | 31,489,424 |
| Jan 2025 | $153.84 | $156.37 | $139.71 | $143.93 | -5.88% | 25,768,967 |
| Dec 2024 | $160.16 | $165.29 | $145.07 | $152.92 | -4.80% | 31,962,932 |
| Nov 2024 | $173.65 | $179.20 | $153.62 | $160.63 | -7.68% | 34,753,532 |
| Oct 2024 | $194.61 | $195.00 | $173.88 | $174.00 | -10.24% | 30,797,091 |
| Sep 2024 | $204.22 | $206.70 | $188.78 | $193.84 | -5.33% | 21,982,284 |
| Aug 2024 | $215.80 | $219.44 | $196.90 | $204.76 | -3.96% | 19,658,581 |
| Jul 2024 | $231.41 | $238.00 | $209.75 | $213.20 | -8.03% | 22,032,257 |
| Jun 2024 | $225.30 | $237.54 | $220.02 | $231.82 | +3.06% | 21,029,924 |
| May 2024 | $215.56 | $236.90 | $210.33 | $224.94 | +4.71% | 22,550,671 |
| Apr 2024 | $215.69 | $218.86 | $189.44 | $214.82 | -0.38% | 28,896,537 |
| Mar 2024 | $217.46 | $230.22 | $211.02 | $215.63 | -0.63% | 26,467,544 |
| Feb 2024 | $245.40 | $249.33 | $215.68 | $216.99 | -12.03% | 25,351,313 |
| Jan 2024 | $257.56 | $268.30 | $240.83 | $246.66 | -4.68% | 20,226,633 |
| Dec 2023 | $233.95 | $263.98 | $229.16 | $258.77 | +10.55% | 23,772,576 |
| Nov 2023 | $238.56 | $251.51 | $220.86 | $234.08 | -1.46% | 23,324,436 |
| Oct 2023 | $255.85 | $269.43 | $233.76 | $237.54 | -7.58% | 21,997,935 |
| Sep 2023 | $269.01 | $270.50 | $251.85 | $257.01 | -3.87% | 16,166,057 |
| Aug 2023 | $269.36 | $278.95 | $259.76 | $267.36 | -1.05% | 18,354,823 |
| Jul 2023 | $282.87 | $287.60 | $256.13 | $270.19 | -5.15% | 28,761,270 |
| Jun 2023 | $301.02 | $319.76 | $277.71 | $284.85 | -3.90% | 23,456,267 |
| May 2023 | $305.75 | $319.74 | $291.64 | $296.41 | -2.57% | 21,339,188 |
| Apr 2023 | $276.34 | $305.50 | $273.39 | $304.23 | +9.42% | 17,355,890 |
| Mar 2023 | $267.97 | $279.00 | $254.80 | $278.03 | +3.03% | 19,959,286 |
| Feb 2023 | $289.57 | $293.47 | $266.78 | $269.86 | -7.23% | 17,527,706 |
| Jan 2023 | $276.73 | $295.90 | $265.32 | $290.90 | +5.05% | 24,120,700 |
| Dec 2022 | $305.51 | $306.28 | $272.20 | $276.92 | -9.26% | 23,482,533 |
| Nov 2022 | $283.44 | $311.88 | $274.63 | $305.17 | +7.67% | 27,708,443 |
| Oct 2022 | $269.00 | $285.35 | $250.31 | $283.44 | +6.16% | 35,183,916 |
| Sep 2022 | $194.77 | $283.44 | $193.65 | $267.00 | +36.66% | 44,140,981 |
| Aug 2022 | $213.90 | $222.82 | $193.65 | $195.38 | -9.15% | 17,169,496 |
| Jul 2022 | $205.37 | $222.20 | $203.92 | $215.06 | +5.45% | 18,745,104 |
| Jun 2022 | $202.00 | $213.88 | $188.54 | $203.94 | +1.97% | 24,800,028 |
| May 2022 | $206.30 | $214.78 | $187.16 | $200.00 | -3.59% | 25,705,951 |
| Apr 2022 | $212.49 | $225.50 | $204.86 | $207.44 | -1.50% | 20,111,824 |
| Mar 2022 | $210.58 | $218.22 | $192.67 | $210.60 | -0.19% | 24,044,872 |
| Feb 2022 | $227.17 | $231.22 | $200.36 | $211.01 | -6.63% | 21,699,860 |
| Jan 2022 | $240.15 | $249.00 | $214.88 | $226.00 | -5.80% | 39,598,392 |
| Dec 2021 | $236.98 | $265.54 | $221.72 | $239.92 | +1.77% | 36,745,037 |
| Nov 2021 | $266.15 | $284.59 | $228.68 | $235.74 | -11.60% | 25,906,697 |
| Oct 2021 | $281.35 | $290.76 | $259.63 | $266.68 | -5.76% | 22,855,738 |
| Sep 2021 | $340.78 | $341.29 | $282.64 | $282.99 | -16.50% | 22,808,559 |
| Aug 2021 | $327.04 | $351.86 | $325.09 | $338.91 | +3.73% | 18,721,871 |
| Jul 2021 | $346.00 | $372.12 | $317.26 | $326.73 | -5.64% | 27,826,369 |
| Jun 2021 | $272.35 | $468.55 | $264.12 | $346.27 | +29.46% | 79,202,110 |
| May 2021 | $267.87 | $290.36 | $266.00 | $267.48 | +0.06% | 20,137,645 |
| Apr 2021 | $280.00 | $281.88 | $257.03 | $267.33 | -4.44% | 19,633,814 |
| Mar 2021 | $274.42 | $280.83 | $250.42 | $279.75 | +2.52% | 29,530,106 |
| Feb 2021 | $283.20 | $288.08 | $260.97 | $272.88 | -3.44% | 23,887,258 |
| Jan 2021 | $245.74 | $296.38 | $238.40 | $282.61 | +15.42% | 26,916,386 |
| Dec 2020 | $241.23 | $254.00 | $240.35 | $244.86 | +1.95% | 26,734,969 |
| Nov 2020 | $253.64 | $363.92 | $223.25 | $240.17 | -4.72% | 54,913,896 |
| Oct 2020 | $284.96 | $293.34 | $243.25 | $252.07 | -11.14% | 23,319,134 |
| Sep 2020 | $287.48 | $288.03 | $265.05 | $283.68 | -1.38% | 26,003,226 |
| Aug 2020 | $274.70 | $312.00 | $274.43 | $287.64 | +4.71% | 26,400,945 |
| Jul 2020 | $266.89 | $294.99 | $261.87 | $274.69 | +2.67% | 26,175,480 |
| Jun 2020 | $305.72 | $308.27 | $257.60 | $267.55 | -12.88% | 45,316,967 |
| May 2020 | $295.07 | $335.00 | $291.83 | $307.09 | +3.46% | 26,432,307 |
| Apr 2020 | $308.81 | $350.24 | $289.02 | $296.83 | -6.18% | 46,781,021 |
| Mar 2020 | $308.64 | $333.00 | $262.25 | $316.38 | +2.59% | 53,921,667 |
| Feb 2020 | $270.61 | $374.99 | $269.76 | $308.39 | +14.71% | 41,550,908 |
| Jan 2020 | $299.06 | $306.35 | $267.59 | $268.85 | -9.40% | 31,402,968 |
| Dec 2019 | $292.35 | $309.06 | $275.04 | $296.73 | -1.03% | 37,060,060 |
| Nov 2019 | $299.79 | $307.35 | $271.48 | $299.81 | +0.37% | 34,279,173 |
| Oct 2019 | $232.76 | $318.00 | $219.70 | $298.71 | +28.30% | 71,283,536 |
| Sep 2019 | $218.15 | $242.71 | $215.78 | $232.82 | +5.95% | 32,059,188 |
| Aug 2019 | $238.76 | $245.30 | $217.90 | $219.75 | -7.60% | 26,464,665 |
| Jul 2019 | $236.59 | $246.99 | $227.19 | $237.82 | +1.69% | 29,328,299 |
| Jun 2019 | $220.31 | $245.35 | $219.51 | $233.87 | +6.65% | 35,402,205 |
| May 2019 | $228.97 | $238.17 | $219.20 | $219.29 | -4.34% | 41,143,499 |
| Apr 2019 | $239.07 | $244.08 | $221.53 | $229.24 | -3.02% | 52,499,662 |
| Mar 2019 | $331.29 | $336.57 | $216.12 | $236.38 | -27.94% | 69,059,681 |
| Feb 2019 | $333.75 | $338.87 | $305.45 | $328.01 | -1.73% | 22,142,762 |
| Jan 2019 | $296.84 | $344.00 | $296.54 | $333.78 | +10.92% | 27,004,259 |
| Dec 2018 | $335.00 | $338.72 | $278.46 | $300.92 | -9.83% | 27,952,934 |
| Nov 2018 | $304.43 | $333.77 | $304.27 | $333.72 | +9.68% | 22,895,513 |
| Oct 2018 | $355.30 | $358.41 | $288.34 | $304.27 | -13.88% | 31,890,747 |
| Sep 2018 | $353.85 | $357.50 | $332.48 | $353.31 | -0.05% | 22,329,694 |
| Aug 2018 | $335.84 | $355.94 | $334.38 | $353.49 | +5.72% | 23,025,306 |
| Jul 2018 | $290.30 | $388.67 | $288.13 | $334.37 | +15.20% | 55,890,627 |
| Jun 2018 | $294.94 | $310.91 | $283.24 | $290.24 | -1.27% | 29,212,171 |
| May 2018 | $274.89 | $301.22 | $264.03 | $293.96 | +7.44% | 37,274,196 |
| Apr 2018 | $272.02 | $280.31 | $249.17 | $273.60 | -0.08% | 37,368,218 |
| Mar 2018 | $288.11 | $292.30 | $259.76 | $273.82 | -5.25% | 35,981,715 |
| Feb 2018 | $348.18 | $352.38 | $283.97 | $288.99 | -16.91% | 37,617,088 |
| Jan 2018 | $321.15 | $370.57 | $318.33 | $347.81 | +9.18% | 27,488,607 |
| Dec 2017 | $320.70 | $335.80 | $311.75 | $318.57 | -1.12% | 20,584,031 |
| Nov 2017 | $312.75 | $323.69 | $306.11 | $322.17 | +3.37% | 22,053,557 |
| Oct 2017 | $315.19 | $348.84 | $301.81 | $311.66 | -0.47% | 35,059,018 |
| Sep 2017 | $317.16 | $330.00 | $303.00 | $313.12 | -1.09% | 25,429,851 |
| Aug 2017 | $290.80 | $316.85 | $280.60 | $316.56 | +9.31% | 25,827,304 |
| Jul 2017 | $272.62 | $296.95 | $269.50 | $289.59 | +6.72% | 26,863,674 |
| Jun 2017 | $250.03 | $284.47 | $248.61 | $271.36 | +9.52% | 38,686,789 |
| May 2017 | $271.35 | $273.81 | $244.28 | $247.77 | -8.64% | 31,686,011 |
| Apr 2017 | $274.08 | $291.90 | $267.10 | $271.21 | -0.81% | 28,697,526 |
| Mar 2017 | $290.07 | $298.00 | $267.74 | $273.42 | -5.26% | 39,661,127 |
| Feb 2017 | $278.98 | $293.98 | $260.50 | $288.60 | +4.10% | 32,976,065 |
| Jan 2017 | $285.82 | $301.42 | $271.43 | $277.24 | -2.24% | 33,513,400 |
| Dec 2016 | $296.32 | $306.98 | $272.96 | $283.58 | -3.57% | 41,473,500 |
| Nov 2016 | $280.03 | $329.83 | $268.00 | $294.07 | +4.96% | 37,949,800 |
| Oct 2016 | $313.00 | $314.00 | $279.23 | $280.18 | -10.49% | 29,027,000 |
| Sep 2016 | $307.96 | $318.88 | $293.83 | $313.03 | +2.42% | 30,244,900 |
| Aug 2016 | $300.00 | $333.65 | $297.66 | $305.63 | +5.42% | 43,385,700 |
| Jul 2016 | $242.57 | $290.92 | $240.07 | $289.93 | +19.89% | 37,015,400 |
| Jun 2016 | $287.97 | $292.69 | $223.02 | $241.82 | -16.54% | 53,148,000 |
| May 2016 | $274.74 | $291.63 | $256.42 | $289.73 | +5.36% | 28,358,600 |
| Apr 2016 | $258.83 | $286.32 | $257.50 | $274.99 | +5.64% | 39,320,800 |
| Mar 2016 | $261.37 | $274.57 | $242.25 | $260.32 | +0.35% | 36,339,700 |
| Feb 2016 | $270.34 | $279.38 | $242.07 | $259.42 | -5.00% | 38,093,600 |
| Jan 2016 | $300.34 | $301.02 | $257.66 | $273.06 | -10.87% | 44,372,900 |
| Dec 2015 | $289.30 | $311.65 | $274.23 | $306.35 | +6.79% | 33,031,700 |
| Nov 2015 | $294.52 | $304.37 | $278.28 | $286.86 | -1.26% | 37,004,500 |
| Oct 2015 | $291.99 | $299.41 | $254.00 | $290.51 | -0.45% | 82,718,000 |
| Sep 2015 | $292.22 | $330.54 | $267.00 | $291.81 | -1.85% | 56,790,600 |
| Aug 2015 | $320.33 | $338.51 | $265.00 | $297.30 | -6.74% | 55,781,800 |
| Jul 2015 | $408.32 | $412.24 | $299.76 | $318.78 | -21.08% | 67,088,900 |
| Jun 2015 | $398.87 | $420.99 | $378.00 | $403.94 | +1.75% | 28,664,200 |
| May 2015 | $377.52 | $404.00 | $377.52 | $396.99 | +6.17% | 26,965,100 |
| Apr 2015 | $423.20 | $432.88 | $368.88 | $373.93 | -11.44% | 45,438,800 |
| Mar 2015 | $410.67 | $480.18 | $406.02 | $422.24 | +3.09% | 52,474,600 |
| Feb 2015 | $389.03 | $412.02 | $381.36 | $409.59 | +5.25% | 26,301,100 |
| Jan 2015 | $342.84 | $397.00 | $334.40 | $389.16 | +14.64% | 39,420,300 |
| Dec 2014 | $306.43 | $361.93 | $306.11 | $339.45 | +10.32% | 44,112,900 |
| Nov 2014 | $320.78 | $330.37 | $297.83 | $307.69 | -4.17% | 26,192,100 |
| Oct 2014 | $330.97 | $331.15 | $290.85 | $321.08 | -2.94% | 39,377,500 |
| Sep 2014 | $345.47 | $347.79 | $315.71 | $330.81 | -3.57% | 22,151,600 |
| Aug 2014 | $332.93 | $348.49 | $317.00 | $343.04 | +2.59% | 20,935,300 |
| Jul 2014 | $317.03 | $349.00 | $298.31 | $334.39 | +6.05% | 28,967,400 |
| Jun 2014 | $318.93 | $322.05 | $302.01 | $315.31 | -1.27% | 20,471,700 |
| May 2014 | $287.11 | $322.25 | $278.10 | $319.37 | +11.23% | 25,217,700 |
| Apr 2014 | $308.42 | $317.00 | $272.02 | $287.12 | -6.13% | 41,953,100 |
| Mar 2014 | $340.68 | $358.89 | $292.67 | $305.87 | -10.22% | 40,173,600 |
| Feb 2014 | $314.84 | $353.47 | $294.02 | $340.68 | +8.97% | 27,912,100 |
| Jan 2014 | $279.44 | $321.25 | $270.62 | $312.64 | +11.83% | 31,039,900 |
| Dec 2013 | $291.71 | $298.82 | $270.27 | $279.57 | -3.92% | 23,680,600 |
| Nov 2013 | $245.57 | $297.98 | $230.25 | $290.97 | +19.16% | 27,452,600 |
| Oct 2013 | $242.85 | $262.00 | $221.07 | $244.19 | +1.42% | 26,383,100 |
| Sep 2013 | $216.00 | $248.95 | $213.05 | $240.76 | +13.02% | 22,596,700 |
| Aug 2013 | $218.82 | $229.00 | $203.55 | $213.02 | -2.34% | 21,995,300 |
| Jul 2013 | $220.25 | $234.74 | $214.21 | $218.13 | +1.36% | 28,312,400 |
| Jun 2013 | $234.15 | $234.70 | $194.66 | $215.20 | -9.39% | 38,129,800 |
| May 2013 | $215.39 | $242.64 | $208.50 | $237.49 | +8.48% | 27,267,500 |
| Apr 2013 | $193.66 | $226.18 | $191.80 | $218.93 | +13.66% | 32,449,600 |
| Mar 2013 | $165.30 | $192.92 | $164.45 | $192.62 | +15.80% | 28,578,200 |
| Feb 2013 | $157.28 | $169.07 | $155.10 | $166.34 | +6.57% | 24,465,500 |
| Jan 2013 | $148.72 | $156.94 | $139.72 | $156.08 | +6.63% | 38,916,200 |
| Dec 2012 | $150.04 | $155.30 | $145.04 | $146.37 | -1.82% | 17,674,000 |
| Nov 2012 | $139.30 | $151.50 | $134.00 | $149.09 | +7.87% | 24,033,200 |
| Oct 2012 | $149.16 | $154.91 | $136.28 | $138.21 | -7.37% | 24,197,300 |
| Sep 2012 | $145.90 | $157.18 | $144.90 | $149.21 | +1.79% | 20,480,000 |
| Aug 2012 | $146.30 | $147.89 | $141.88 | $146.59 | +0.52% | 16,995,100 |
| Jul 2012 | $143.50 | $150.29 | $137.88 | $145.83 | +1.00% | 21,560,000 |
| Jun 2012 | $128.89 | $144.38 | $126.39 | $144.38 | +10.42% | 27,198,900 |
| May 2012 | $131.61 | $138.49 | $129.48 | $130.75 | -2.43% | 29,033,800 |
| Apr 2012 | $126.11 | $134.50 | $124.23 | $134.01 | +6.36% | 22,423,800 |
| Mar 2012 | $116.01 | $127.85 | $116.01 | $126.00 | +8.18% | 26,028,600 |
| Feb 2012 | $118.46 | $123.23 | $114.53 | $116.47 | -1.25% | 27,743,500 |
| Jan 2012 | $111.44 | $119.56 | $111.44 | $117.95 | +7.18% | 38,407,100 |
| Dec 2011 | $114.95 | $117.55 | $109.05 | $110.05 | -4.26% | 26,723,000 |
| Nov 2011 | $114.37 | $115.50 | $106.31 | $114.95 | -1.21% | 36,336,400 |
| Oct 2011 | $92.55 | $120.66 | $87.72 | $116.36 | +24.92% | 51,276,400 |
| Sep 2011 | $94.02 | $102.01 | $89.04 | $93.15 | -1.11% | 38,950,000 |
| Aug 2011 | $105.91 | $105.98 | $83.83 | $94.20 | -7.53% | 53,673,000 |
| Jul 2011 | $107.35 | $109.14 | $99.54 | $101.87 | -4.72% | 33,091,600 |
| Jun 2011 | $94.36 | $109.63 | $91.08 | $106.92 | +12.87% | 59,713,200 |
| May 2011 | $97.44 | $99.19 | $92.29 | $94.73 | -2.99% | 39,837,000 |
| Apr 2011 | $73.59 | $106.99 | $72.70 | $97.65 | +32.91% | 73,743,200 |
| Mar 2011 | $68.41 | $73.53 | $68.26 | $73.47 | +7.41% | 40,811,700 |
| Feb 2011 | $67.75 | $68.50 | $64.61 | $68.40 | +4.48% | 35,170,800 |
| Jan 2011 | $67.68 | $68.99 | $64.28 | $65.47 | -2.36% | 37,412,900 |
| Dec 2010 | $64.89 | $68.60 | $64.63 | $67.05 | +4.81% | 37,407,500 |
| Nov 2010 | $62.89 | $66.43 | $61.82 | $63.97 | +2.01% | 46,604,300 |
| Oct 2010 | $56.00 | $64.92 | $55.63 | $62.71 | +11.74% | 49,553,900 |
| Sep 2010 | $54.48 | $58.64 | $53.97 | $56.12 | +4.31% | 51,792,000 |
| Aug 2010 | $56.59 | $58.16 | $53.14 | $53.80 | -3.72% | 46,797,700 |
| Jul 2010 | $47.70 | $58.16 | $46.15 | $55.88 | +17.77% | 91,488,400 |
| Jun 2010 | $47.25 | $50.55 | $45.96 | $47.45 | +0.04% | 74,843,100 |
| May 2010 | $53.50 | $53.92 | $47.10 | $47.43 | -11.00% | 64,814,000 |
| Apr 2010 | $57.80 | $57.99 | $51.62 | $53.29 | -7.14% | 62,150,700 |
| Mar 2010 | $55.48 | $60.28 | $55.34 | $57.39 | +4.33% | 49,405,200 |
| Feb 2010 | $53.41 | $56.99 | $52.23 | $55.01 | +2.36% | 54,880,300 |
| Jan 2010 | $53.97 | $55.37 | $52.16 | $53.74 | +0.45% | 59,027,400 |
| Dec 2009 | $47.10 | $54.00 | $46.94 | $53.50 | +13.98% | 63,750,300 |
| Nov 2009 | $42.86 | $47.71 | $42.31 | $46.94 | +11.42% | 79,719,600 |
| Oct 2009 | $50.44 | $50.48 | $41.75 | $42.13 | -16.61% | 78,277,500 |
| Sep 2009 | $49.61 | $52.12 | $48.64 | $50.52 | +0.64% | 54,681,800 |
| Aug 2009 | $47.47 | $50.43 | $46.39 | $50.20 | +5.57% | 45,900,000 |
| Jul 2009 | $45.33 | $49.76 | $44.41 | $47.55 | +5.32% | 74,156,500 |
| Jun 2009 | $52.25 | $54.50 | $44.56 | $45.15 | -12.82% | 69,752,900 |
| May 2009 | $47.65 | $52.36 | $45.50 | $51.79 | +7.14% | 53,540,900 |
| Apr 2009 | $51.47 | $55.34 | $45.70 | $48.34 | -7.78% | 78,683,100 |
| Mar 2009 | $45.21 | $53.50 | $42.92 | $52.42 | +13.86% | 77,373,700 |
| Feb 2009 | $48.15 | $53.66 | $45.55 | $46.04 | -5.36% | 74,919,000 |
| Jan 2009 | $47.49 | $52.35 | $45.43 | $48.65 | +2.14% | 81,151,500 |
| Dec 2008 | $41.43 | $49.58 | $39.01 | $47.63 | +12.57% | 74,314,800 |
| Nov 2008 | $44.26 | $47.98 | $37.21 | $42.31 | -0.56% | 69,773,400 |
| Oct 2008 | $49.15 | $52.36 | $38.04 | $42.55 | -15.39% | 122,887,500 |
| Sep 2008 | $51.89 | $52.37 | $45.37 | $50.29 | -1.26% | 94,732,900 |
| Aug 2008 | $51.66 | $55.45 | $49.64 | $50.93 | -26.99% | 125,408,000 |
| Jul 2008 | $56.07 | $73.59 | $55.36 | $69.76 | +24.82% | 97,829,300 |
| Jun 2008 | $62.85 | $66.41 | $55.68 | $55.89 | -10.93% | 66,931,800 |
| May 2008 | $60.94 | $64.36 | $60.60 | $62.75 | +3.39% | 43,653,300 |
| Apr 2008 | $62.14 | $67.45 | $60.59 | $60.69 | -1.62% | 69,947,100 |
| Mar 2008 | $58.02 | $63.75 | $54.50 | $61.69 | +5.71% | 73,226,100 |
| Feb 2008 | $61.13 | $64.49 | $57.95 | $58.36 | -4.25% | 61,214,000 |
| Jan 2008 | $56.91 | $62.68 | $54.90 | $60.95 | +7.08% | 85,483,600 |
| Dec 2007 | $73.63 | $78.57 | $53.65 | $56.92 | -23.21% | 110,252,300 |
| Nov 2007 | $74.40 | $77.45 | $67.53 | $74.12 | -0.43% | 81,913,700 |
| Oct 2007 | $66.69 | $84.75 | $65.07 | $74.44 | +12.23% | 129,959,900 |
| Sep 2007 | $63.77 | $69.00 | $62.76 | $66.33 | +3.93% | 71,770,500 |
| Aug 2007 | $56.82 | $64.80 | $55.26 | $63.82 | +12.88% | 106,835,900 |
| Jul 2007 | $53.50 | $59.78 | $53.24 | $56.54 | +5.68% | 110,346,900 |
| Jun 2007 | $52.49 | $53.96 | $50.63 | $53.50 | +2.45% | 117,911,200 |
| May 2007 | $47.50 | $52.47 | $45.77 | $52.22 | +10.61% | 98,942,500 |
| Apr 2007 | $44.55 | $49.00 | $43.43 | $47.21 | +6.38% | 68,702,200 |
| Mar 2007 | $44.22 | $46.10 | $42.86 | $44.38 | -1.79% | 74,350,800 |
| Feb 2007 | $48.32 | $50.51 | $45.02 | $45.19 | -6.52% | 66,451,900 |
| Jan 2007 | $49.28 | $52.45 | $47.04 | $48.34 | -1.73% | 61,967,600 |
| Dec 2006 | $52.50 | $52.72 | $48.00 | $49.19 | -5.87% | 61,172,800 |
| Nov 2006 | $47.67 | $52.50 | $46.74 | $52.26 | +9.79% | 65,114,100 |
| Oct 2006 | $44.81 | $48.50 | $43.49 | $47.60 | +6.54% | 67,507,700 |
| Sep 2006 | $44.40 | $45.02 | $42.51 | $44.68 | +1.09% | 56,293,100 |
| Aug 2006 | $41.97 | $45.01 | $40.81 | $44.20 | +5.11% | 64,394,400 |
| Jul 2006 | $46.52 | $47.46 | $40.24 | $42.05 | -9.22% | 63,806,200 |
| Jun 2006 | $46.91 | $48.97 | $43.66 | $46.32 | -0.66% | 70,009,700 |
| May 2006 | $44.81 | $47.74 | $43.72 | $46.63 | +3.97% | 73,280,600 |
| Apr 2006 | $47.20 | $47.75 | $42.52 | $44.85 | -4.78% | 62,481,400 |
| Mar 2006 | $47.00 | $49.69 | $44.93 | $47.10 | -0.32% | 91,582,000 |
| Feb 2006 | $44.48 | $50.72 | $43.03 | $47.25 | +5.59% | 69,831,900 |
| Jan 2006 | $45.69 | $48.50 | $43.39 | $44.75 | -1.17% | 59,913,400 |
| Dec 2005 | $42.95 | $46.72 | $42.33 | $45.28 | +5.77% | 60,290,400 |
| Nov 2005 | $40.51 | $46.00 | $39.81 | $42.81 | +5.37% | 59,595,700 |
| Oct 2005 | $39.58 | $40.85 | $35.66 | $40.63 | +2.91% | 76,606,300 |
| Sep 2005 | $42.20 | $43.41 | $37.61 | $39.48 | -6.31% | 68,581,500 |
| Aug 2005 | $39.41 | $42.65 | $37.69 | $42.14 | +7.25% | 92,734,700 |
| Jul 2005 | $34.35 | $39.95 | $33.88 | $39.29 | +14.05% | 79,324,900 |
| Jun 2005 | $39.41 | $40.02 | $33.18 | $34.45 | -11.89% | 125,074,800 |
| May 2005 | $36.38 | $39.98 | $36.38 | $39.10 | +7.89% | 80,574,100 |
| Apr 2005 | $34.67 | $37.31 | $34.21 | $36.24 | +5.01% | 100,832,800 |
| Mar 2005 | $40.00 | $42.25 | $33.85 | $34.51 | -10.71% | 307,860,800 |
| Feb 2005 | $64.78 | $70.00 | $35.86 | $38.65 | -40.50% | 172,780,100 |
| Jan 2005 | $66.92 | $68.39 | $61.27 | $64.96 | -2.48% | 77,338,400 |
| Dec 2004 | $59.15 | $68.13 | $59.12 | $66.61 | +13.51% | 77,185,100 |
| Nov 2004 | $57.94 | $62.33 | $54.30 | $58.68 | +0.89% | 92,858,600 |
| Oct 2004 | $60.88 | $63.10 | $55.25 | $58.16 | -4.92% | 73,167,100 |
| Sep 2004 | $59.06 | $62.95 | $58.93 | $61.17 | +3.10% | 51,715,400 |
| Aug 2004 | $59.80 | $60.99 | $55.00 | $59.33 | -1.12% | 64,499,200 |
| Jul 2004 | $63.05 | $63.50 | $53.06 | $60.00 | -5.14% | 71,722,100 |
| Jun 2004 | $61.74 | $64.00 | $56.50 | $63.25 | +1.77% | 71,670,400 |
| May 2004 | $59.09 | $63.94 | $55.15 | $62.15 | +5.34% | 82,117,000 |
| Apr 2004 | $55.40 | $62.25 | $54.56 | $59.00 | +6.12% | 79,163,700 |
| Mar 2004 | $56.05 | $59.63 | $50.87 | $55.60 | +0.27% | 108,884,600 |
| Feb 2004 | $42.51 | $59.28 | $41.75 | $55.45 | +29.01% | 134,247,400 |
| Jan 2004 | $36.95 | $45.75 | $36.60 | $42.98 | +17.11% | 104,082,300 |
| Dec 2003 | $38.37 | $39.41 | $35.39 | $36.70 | -3.88% | 61,146,000 |
| Nov 2003 | $35.02 | $38.49 | $32.34 | $38.18 | +8.65% | 113,679,200 |
| Oct 2003 | $33.54 | $35.72 | $31.63 | $35.14 | +5.56% | 79,716,500 |
| Sep 2003 | $34.71 | $37.93 | $32.75 | $33.29 | -4.12% | 72,527,000 |
| Aug 2003 | $33.60 | $34.97 | $31.73 | $34.72 | +2.84% | 49,915,100 |
| Jul 2003 | $33.80 | $38.95 | $32.86 | $33.76 | -0.59% | 112,763,800 |
| Jun 2003 | $40.35 | $42.15 | $33.80 | $33.96 | -11.15% | 138,166,900 |
| May 2003 | $33.00 | $41.22 | $31.87 | $38.22 | +16.70% | 80,695,300 |
| Apr 2003 | $34.89 | $38.16 | $30.01 | $32.75 | -4.30% | 91,447,800 |
| Mar 2003 | $28.59 | $36.04 | $27.80 | $34.22 | +19.03% | 79,883,900 |
| Feb 2003 | $32.08 | $32.69 | $28.26 | $28.75 | -10.38% | 56,551,500 |
| Jan 2003 | $33.38 | $37.14 | $31.29 | $32.08 | -3.29% | 86,121,200 |
| Dec 2002 | $33.31 | $35.92 | $31.17 | $33.17 | +1.10% | 81,128,000 |
| Nov 2002 | $46.06 | $47.41 | $32.04 | $32.81 | -28.70% | 100,601,000 |
| Oct 2002 | $41.81 | $46.50 | $35.37 | $46.02 | +10.84% | 118,553,300 |
| Sep 2002 | $40.04 | $44.98 | $37.50 | $41.52 | +3.33% | 105,217,200 |
| Aug 2002 | $44.30 | $47.67 | $40.01 | $40.18 | -9.89% | 92,348,800 |
| Jul 2002 | $34.01 | $45.35 | $20.76 | $44.59 | +25.78% | 136,978,000 |
| Jun 2002 | $42.85 | $42.85 | $30.75 | $35.45 | -17.35% | 132,809,900 |
| May 2002 | $54.87 | $55.21 | $41.20 | $42.89 | -21.95% | 122,022,600 |
| Apr 2002 | $64.37 | $66.84 | $51.14 | $54.95 | -14.54% | 109,248,500 |
| Mar 2002 | $62.58 | $71.40 | $61.10 | $64.30 | +2.36% | 62,419,700 |
| Feb 2002 | $59.98 | $65.58 | $50.08 | $62.82 | +5.65% | 78,521,000 |
| Jan 2002 | $68.95 | $69.98 | $55.20 | $59.46 | -13.74% | 94,731,100 |
| Dec 2001 | $69.75 | $73.32 | $63.67 | $68.93 | -1.95% | 61,937,000 |
| Nov 2001 | $60.08 | $70.82 | $58.50 | $70.30 | +17.21% | 58,570,000 |
| Oct 2001 | $48.50 | $61.58 | $47.07 | $59.98 | +21.00% | 78,330,100 |
| Sep 2001 | $59.63 | $62.49 | $44.78 | $49.57 | -16.37% | 67,815,900 |
| Aug 2001 | $54.61 | $62.33 | $46.05 | $59.27 | +9.80% | 76,153,800 |
| Jul 2001 | $67.96 | $69.60 | $49.50 | $53.98 | -20.25% | 81,811,200 |
| Jun 2001 | $62.36 | $75.00 | $61.20 | $67.69 | +9.89% | 85,323,600 |
| May 2001 | $50.00 | $63.35 | $42.90 | $61.60 | +25.20% | 76,317,500 |
| Apr 2001 | $39.25 | $57.06 | $33.50 | $49.20 | +23.00% | 83,560,000 |
| Mar 2001 | $55.50 | $59.38 | $32.63 | $40.00 | -29.05% | 87,897,700 |
| Feb 2001 | $58.75 | $63.25 | $50.06 | $56.38 | -4.14% | 48,760,500 |
| Jan 2001 | $63.08 | $67.56 | $45.33 | $58.81 | -6.92% | 122,554,200 |
| Dec 2000 | $59.02 | $77.65 | $56.31 | $63.19 | +8.90% | 118,637,700 |
| Nov 2000 | $65.32 | $74.00 | $50.38 | $58.02 | -11.25% | 113,972,700 |
| Oct 2000 | $58.75 | $67.40 | $50.75 | $65.38 | +11.84% | 87,520,200 |
| Sep 2000 | $47.40 | $60.04 | $43.75 | $58.45 | +25.59% | 53,041,800 |
| Aug 2000 | $41.27 | $47.65 | $41.25 | $46.54 | +13.69% | 47,665,500 |
| Jul 2000 | $39.06 | $44.88 | $36.75 | $40.94 | +4.69% | 60,996,600 |
| Jun 2000 | $22.00 | $42.88 | $21.90 | $39.10 | +83.84% | 101,900,700 |
| May 2000 | $21.85 | $26.67 | $19.00 | $21.27 | -0.29% | 56,663,700 |
| Apr 2000 | $33.13 | $39.67 | $18.54 | $21.33 | -34.86% | 99,102,900 |
| Mar 2000 | $46.83 | $57.67 | $27.25 | $32.75 | -30.26% | 105,603,300 |
| Feb 2000 | $42.21 | $49.67 | $34.17 | $46.96 | +11.64% | 78,873,300 |
| Jan 2000 | $32.79 | $50.54 | $25.00 | $42.06 | +28.44% | 85,253,700 |
| Dec 1999 | $21.17 | $35.00 | $18.33 | $32.75 | +55.03% | 96,492,000 |
| Nov 1999 | $19.30 | $23.33 | $18.88 | $21.13 | +9.09% | 64,711,800 |
| Oct 1999 | $15.68 | $20.90 | $14.25 | $19.36 | +23.56% | 84,410,400 |
| Sep 1999 | $21.16 | $24.25 | $14.81 | $15.67 | -26.00% | 151,548,000 |
| Aug 1999 | $16.69 | $23.54 | $16.17 | $21.18 | +28.18% | 71,535,600 |
| Jul 1999 | $12.77 | $17.20 | $12.33 | $16.52 | +28.63% | 65,609,400 |
| Jun 1999 | $8.41 | $13.21 | $8.40 | $12.84 | +52.79% | 51,964,200 |
| May 1999 | $8.42 | $10.10 | $8.29 | $8.41 | -0.61% | 37,639,200 |
| Apr 1999 | $8.60 | $9.85 | $7.08 | $8.46 | -1.22% | 53,669,400 |
| Mar 1999 | $7.19 | $9.19 | $7.00 | $8.56 | +18.61% | 63,861,000 |
| Feb 1999 | $8.43 | $8.50 | $6.60 | $7.22 | -14.23% | 48,001,200 |
| Jan 1999 | $7.84 | $8.67 | $6.77 | $8.42 | +7.45% | 60,523,200 |
| Dec 1998 | $5.27 | $8.03 | $4.84 | $7.83 | +39.78% | 106,890,600 |
| Nov 1998 | $4.98 | $5.83 | $4.56 | $5.60 | +12.55% | 29,860,800 |
| Oct 1998 | $3.79 | $5.21 | $3.04 | $4.98 | +25.79% | 60,076,800 |
| Sep 1998 | $3.00 | $4.98 | $2.88 | $3.96 | +31.94% | 52,588,800 |
| Aug 1998 | $3.98 | $4.38 | $2.96 | $3.00 | -24.01% | 49,545,600 |
| Jul 1998 | $3.96 | $4.71 | $3.65 | $3.95 | +0.53% | 64,696,200 |
| Jun 1998 | $5.25 | $5.40 | $3.77 | $3.93 | -25.20% | 51,937,800 |
| May 1998 | $6.04 | $6.31 | $5.00 | $5.25 | -12.50% | 54,339,000 |
| Apr 1998 | $7.41 | $7.58 | $5.25 | $6.00 | -18.64% | 66,367,800 |
| Mar 1998 | $7.63 | $7.90 | $6.50 | $7.38 | -2.48% | 49,689,000 |
| Feb 1998 | $7.04 | $7.77 | $6.75 | $7.56 | +8.68% | 41,684,400 |
| Jan 1998 | $5.73 | $7.38 | $5.46 | $6.96 | +21.45% | 45,237,000 |
| Dec 1997 | $5.90 | $6.40 | $5.13 | $5.73 | -1.61% | 42,278,400 |
| Nov 1997 | $6.42 | $6.79 | $5.35 | $5.82 | -8.36% | 34,861,200 |
| Oct 1997 | $7.00 | $7.71 | $5.33 | $6.35 | -8.96% | 54,614,400 |
| Sep 1997 | $5.04 | $7.07 | $4.83 | $6.98 | +37.86% | 79,316,400 |
| Aug 1997 | $4.54 | $5.23 | $3.90 | $5.06 | +11.47% | 36,090,600 |
| Jul 1997 | $4.02 | $4.85 | $4.00 | $4.54 | +12.37% | 53,964,000 |
| Jun 1997 | $3.77 | $4.52 | $3.50 | $4.04 | +7.78% | 44,834,400 |
| May 1997 | $3.00 | $3.90 | $2.96 | $3.75 | +26.76% | 42,061,800 |
| Apr 1997 | $3.96 | $4.06 | $2.63 | $2.96 | -25.46% | 47,294,400 |
| Mar 1997 | $4.21 | $5.13 | $3.95 | $3.97 | -4.27% | 51,712,200 |
| Feb 1997 | $3.90 | $4.18 | $3.40 | $4.15 | +6.99% | 35,216,400 |
| Jan 1997 | $3.96 | $3.96 | $3.31 | $3.88 | -2.10% | 26,566,200 |
| Dec 1996 | $4.00 | $4.40 | $3.13 | $3.96 | -2.06% | 47,338,200 |
| Nov 1996 | $3.60 | $4.10 | $3.02 | $4.04 | +12.14% | 22,551,000 |
| Oct 1996 | $4.00 | $4.40 | $3.35 | $3.60 | -9.89% | 25,618,200 |
| Sep 1996 | $3.79 | $4.56 | $3.79 | $4.00 | +2.67% | 26,220,000 |
| Aug 1996 | $2.54 | $4.04 | $2.52 | $3.90 | +50.81% | 29,891,400 |
| Jul 1996 | $3.85 | $4.06 | $2.31 | $2.58 | -32.97% | 50,706,600 |
| Jun 1996 | $4.29 | $4.29 | $3.50 | $3.85 | -10.19% | 31,525,200 |
| May 1996 | $4.83 | $5.44 | $4.19 | $4.29 | -10.82% | 31,256,400 |
| Apr 1996 | $3.71 | $5.00 | $3.69 | $4.81 | +29.78% | 35,725,800 |
| Mar 1996 | $3.40 | $3.81 | $2.65 | $3.71 | +9.88% | 40,191,000 |
| Feb 1996 | $3.54 | $3.73 | $3.17 | $3.38 | -5.81% | 17,262,600 |
| Jan 1996 | $3.10 | $3.85 | $2.94 | $3.58 | +10.26% | 45,216,600 |
| Dec 1995 | $2.27 | $3.94 | $2.23 | $3.25 | +41.82% | 38,109,600 |
| Nov 1995 | $2.06 | $2.58 | $1.96 | $2.29 | +15.79% | 26,308,800 |
| Oct 1995 | $1.31 | $2.06 | $1.19 | $1.98 | +50.80% | 25,346,400 |
| Sep 1995 | $1.17 | $1.46 | $1.15 | $1.31 | +14.55% | 13,363,200 |
| Aug 1995 | $1.13 | $1.38 | $0.9792 | $1.15 | +1.85% | 8,523,000 |
| Jul 1995 | $0.9375 | $1.15 | $0.875 | $1.13 | +20.00% | 10,514,400 |
| Jun 1995 | $0.7292 | $0.9375 | $0.6875 | $0.9375 | +25.00% | 8,565,000 |
| May 1995 | $0.6875 | $0.7708 | $0.625 | $0.75 | +12.50% | 4,323,600 |
| Apr 1995 | $0.6563 | $0.6875 | $0.5833 | $0.6667 | +6.67% | 4,831,800 |
| Mar 1995 | $0.6458 | $0.7708 | $0.5625 | $0.625 | 0.00% | 10,250,400 |
| Feb 1995 | $0.4375 | $0.7083 | $0.4167 | $0.625 | +46.34% | 8,679,000 |
| Jan 1995 | $0.3646 | $0.4375 | $0.3542 | $0.4271 | +20.59% | 9,532,200 |
| Dec 1994 | $0.4167 | $0.4375 | $0.3542 | $0.3542 | -15.00% | 5,077,800 |
| Nov 1994 | $0.4583 | $0.4792 | $0.3958 | $0.4167 | -13.04% | 2,452,800 |
| Oct 1994 | $0.4167 | $0.50 | $0.375 | $0.4792 | +21.05% | 6,193,200 |
| Sep 1994 | $0.50 | $0.50 | $0.3958 | $0.3958 | -13.64% | 1,301,400 |
| Aug 1994 | $0.4375 | $0.5313 | $0.4167 | $0.4583 | 0.00% | 4,293,600 |
| Jul 1994 | $0.4167 | $0.50 | $0.3958 | $0.4583 | +12.82% | 2,365,200 |
| Jun 1994 | $0.625 | $0.6458 | $0.375 | $0.4063 | -35.00% | 7,569,000 |
| May 1994 | $0.6042 | $0.75 | $0.5833 | $0.625 | +3.45% | 4,290,000 |
| Apr 1994 | $0.6667 | $0.7083 | $0.5417 | $0.6042 | -6.45% | 3,067,800 |
| Mar 1994 | $0.875 | $0.9167 | $0.6458 | $0.6458 | -26.19% | 3,859,200 |
| Feb 1994 | $1.04 | $1.08 | $0.8542 | $0.875 | -19.23% | 3,732,600 |
| Jan 1994 | $0.9167 | $1.13 | $0.8958 | $1.08 | +13.04% | 6,979,200 |
| Dec 1993 | $0.9583 | $1.38 | $0.875 | $0.9583 | -4.17% | 11,656,800 |
| Nov 1993 | $0.9167 | $1.04 | $0.9167 | $1.00 | +6.67% | 7,826,400 |
| Oct 1993 | $0.8333 | $1.08 | $0.8333 | $0.9375 | +12.50% | 6,879,000 |
| Sep 1993 | $0.8125 | $0.875 | $0.6667 | $0.8333 | -4.76% | 3,888,600 |
| Aug 1993 | $0.7083 | $1.04 | $0.625 | $0.875 | +40.00% | 7,658,400 |
| Jul 1993 | $0.9167 | $0.9167 | $0.625 | $0.625 | -31.82% | 4,066,800 |
| Jun 1993 | $0.9583 | $0.9583 | $0.7917 | $0.9167 | -2.22% | 5,034,000 |
| May 1993 | $0.7917 | $1.17 | $0.7917 | $0.9375 | +18.42% | 5,247,600 |
| Apr 1993 | $0.9167 | $1.00 | $0.7917 | $0.7917 | -17.39% | 4,152,000 |
| Mar 1993 | $1.17 | $1.17 | $0.9167 | $0.9583 | -17.86% | 2,675,400 |
| Feb 1993 | $1.17 | $1.25 | $0.9583 | $1.17 | 0.00% | 5,320,200 |
| Jan 1993 | $1.54 | $1.54 | $1.13 | $1.17 | -20.00% | 3,909,000 |
| Dec 1992 | $1.67 | $1.88 | $1.46 | $1.46 | -16.67% | 4,944,600 |
| Nov 1992 | $1.50 | $1.79 | $1.50 | $1.75 | +10.53% | 5,447,400 |
| Oct 1992 | $1.08 | $1.67 | $0.9583 | $1.58 | +46.16% | 8,070,600 |
| Sep 1992 | $1.21 | $1.25 | $1.08 | $1.08 | -8.77% | 3,422,400 |
| Aug 1992 | $1.46 | $1.46 | $1.04 | $1.19 | -16.18% | 2,886,600 |
| Jul 1992 | $1.13 | $1.63 | $1.08 | $1.42 | +28.30% | 7,113,000 |
| Jun 1992 | $1.42 | $1.54 | $1.08 | $1.10 | -17.18% | 5,657,400 |
| May 1992 | $1.21 | $1.42 | $1.04 | $1.33 | 0.00% | 7,321,200 |
| Apr 1992 | $1.83 | $1.88 | $1.04 | $1.33 | -27.27% | 6,922,200 |
| Mar 1992 | $2.29 | $2.33 | $1.81 | $1.83 | -21.43% | 7,993,200 |
| Feb 1992 | $2.58 | $2.67 | $1.96 | $2.33 | -9.68% | 8,160,000 |
| Jan 1992 | $2.17 | $3.38 | $2.04 | $2.58 | +19.23% | 15,371,400 |
| Dec 1991 | $1.88 | $2.50 | $1.88 | $2.17 | +8.34% | 6,007,200 |
| Nov 1991 | $3.00 | $3.13 | $1.83 | $2.00 | -35.13% | 17,532,600 |
| Oct 1991 | $3.17 | $3.54 | $2.46 | $3.08 | -1.33% | 14,941,800 |
| Sep 1991 | $3.00 | $3.38 | $2.96 | $3.13 | – | 28,838,400 |
Seasonality
BIIB return in each calendar month over the last 10 years, including dividends. The current month runs to the latest close.
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Average | 1.5% | -2.5% | -3.8% | -1.5% | 0.7% | 4.0% | 0.9% | 1.2% | 2.5% | 0.8% | 1.5% | -1.7% |
| Months up | 5 of 10 | 3 of 10 | 3 of 10 | 2 of 10 | 6 of 10 | 6 of 10 | 6 of 10 | 6 of 10 | 4 of 10 | 4 of 10 | 5 of 9 | 3 of 9 |
| 2026 | 2.2% | 6.6% | -4.4% | 3.2% | 3.6% | 10.2% | -6.1% | 6.8% | 4.3% | 12.3% | ||
| 2025 | -5.9% | -2.4% | -2.6% | -11.5% | 7.2% | -3.2% | 1.9% | 3.3% | 5.9% | 10.1% | 18.0% | -3.3% |
| 2024 | -4.7% | -12.0% | -0.6% | -0.4% | 4.7% | 3.1% | -8.0% | -4.0% | -5.3% | -10.2% | -7.7% | -4.8% |
| 2023 | 5.0% | -7.2% | 3.0% | 9.4% | -2.6% | -3.9% | -5.1% | -1.0% | -3.9% | -7.6% | -1.5% | 10.5% |
| 2022 | -5.8% | -6.6% | -0.2% | -1.5% | -3.6% | 2.0% | 5.5% | -9.2% | 36.7% | 6.2% | 7.7% | -9.3% |
| 2021 | 15.4% | -3.4% | 2.5% | -4.4% | 0.1% | 29.5% | -5.6% | 3.7% | -16.5% | -5.8% | -11.6% | 1.8% |
| 2020 | -9.4% | 14.7% | 2.6% | -6.2% | 3.5% | -12.9% | 2.7% | 4.7% | -1.4% | -11.1% | -4.7% | 2.0% |
| 2019 | 10.9% | -1.7% | -27.9% | -3.0% | -4.3% | 6.6% | 1.7% | -7.6% | 5.9% | 28.3% | 0.4% | -1.0% |
| 2018 | 9.2% | -16.9% | -5.2% | -0.1% | 7.4% | -1.3% | 15.2% | 5.7% | -0.1% | -13.9% | 9.7% | -9.8% |
| 2017 | -2.2% | 4.1% | -5.3% | -0.8% | -8.6% | 9.5% | 6.7% | 9.3% | -1.1% | -0.5% | 3.4% | -1.1% |