NASDAQ:BIIB | Historical Stock Price | BIOGEN INC.

Complete retained daily price history on its own workbook tab. Split-adjusted close keeps every historical share price on one comparable split basis. Cumulative dividend-reinvested close is the daily close of a rebased total-return index: it starts with one share at the earliest retained close, reinvests every distribution, and normalizes every forward and reverse split exactly once. Admitted exchange opening prices remain a distinct current-session series.

Available history
1991-09-17 to 2026-09-04
Data captured

Stock Price Chart

Blue: Split-adjusted close · Orange: Cumulative dividend-reinvested close

$0.34$1.42$6.01$25.38$107.26$453.211991-09-172026-08-27

Logarithmic scale. Both lines share the same starting value for the selected range.

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Historical Stock Price — 2015

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2015-12-31$306.35$306.351,063,800
2015-12-30$308.34$308.34802,500
2015-12-29$309.67$309.671,223,300
2015-12-28$303.84$303.84848,400
2015-12-24$302.29$302.29537,100
2015-12-23$300.19$300.19986,500
2015-12-22$300.77$300.771,215,800
2015-12-21$297.56$297.561,137,600
2015-12-18$293.37$293.372,790,200
2015-12-17$297.17$297.171,705,300
2015-12-16$299.29$299.292,104,200
2015-12-15$289.11$289.111,624,300
2015-12-14$282.39$282.391,649,800
2015-12-11$283.46$283.462,029,900
2015-12-10$289.88$289.881,422,800
2015-12-09$284.61$284.611,525,400
2015-12-08$288.46$288.461,752,000
2015-12-07$281.63$281.631,739,700
2015-12-04$284.45$284.451,917,100
2015-12-03$275.44$275.441,902,700
2015-12-02$284.96$284.961,369,000
2015-12-01$290.04$290.041,684,300
2015-11-30$286.86$286.861,679,300
2015-11-27$293.21$293.21465,800
2015-11-25$292.30$292.301,140,100
2015-11-24$289.15$289.151,325,400
2015-11-23$294.25$294.251,392,000
2015-11-20$290.16$290.161,723,700
2015-11-19$289.44$289.441,625,100
2015-11-18$291.98$291.982,253,200
2015-11-17$279.49$279.492,348,500
2015-11-16$283.53$283.531,960,100
2015-11-13$284.84$284.841,926,800
2015-11-12$291.33$291.331,457,200
2015-11-11$293.89$293.892,084,700
2015-11-10$297.22$297.221,801,000
2015-11-09$293.40$293.401,786,200
2015-11-06$295.35$295.352,449,600
2015-11-05$293.03$293.032,259,900
2015-11-04$296.57$296.572,437,700
2015-11-03$299.14$299.142,102,400
2015-11-02$303.08$303.082,785,800
2015-10-30$290.51$290.515,209,100
2015-10-29$293.72$293.723,612,000
2015-10-28$293.69$293.693,306,700
2015-10-27$290.63$290.633,722,600
2015-10-26$274.60$274.603,149,200
2015-10-23$276.99$276.993,866,400
2015-10-22$276.83$276.834,522,700
2015-10-21$276.34$276.348,374,300
2015-10-20$265.81$265.813,539,800
2015-10-19$273.02$273.022,940,000
2015-10-16$272.37$272.372,849,300
2015-10-15$268.41$268.412,750,300
2015-10-14$256.79$256.793,961,400
2015-10-13$256.04$256.044,302,900
2015-10-12$264.67$264.673,686,800
2015-10-09$269.16$269.164,047,200
2015-10-08$279.88$279.882,558,900
2015-10-07$279.24$279.243,469,900
2015-10-06$275.99$275.994,291,600
2015-10-05$286.55$286.552,703,000
2015-10-02$290.35$290.352,982,000
2015-10-01$287.30$287.302,871,900
2015-09-30$291.81$291.812,935,600
2015-09-29$278.23$278.233,819,700
2015-09-28$272.28$272.284,908,200
2015-09-25$284.79$284.793,366,100
2015-09-24$293.01$293.012,663,100
2015-09-23$298.34$298.341,642,900
2015-09-22$299.06$299.064,391,700
2015-09-21$297.16$297.164,161,900
2015-09-18$314.67$314.674,618,800
2015-09-17$325.30$325.302,589,200
2015-09-16$319.56$319.561,984,700
2015-09-15$319.86$319.862,060,400
2015-09-14$316.23$316.231,811,700
2015-09-11$315.37$315.371,928,100
2015-09-10$312.62$312.622,189,600
2015-09-09$303.48$303.481,623,500
2015-09-08$308.74$308.741,840,900
2015-09-04$302.26$302.261,696,600
2015-09-03$301.63$301.631,787,800
2015-09-02$304.21$304.212,271,600
2015-09-01$292.50$292.502,498,500
2015-08-31$297.30$297.301,642,400
2015-08-28$303.69$303.692,058,700
2015-08-27$304.49$304.492,498,600
2015-08-26$298.25$298.253,133,900
2015-08-25$281.75$281.753,744,200
2015-08-24$278.35$278.355,879,900
2015-08-21$295.64$295.643,659,400
2015-08-20$309.90$309.901,913,200
2015-08-19$315.82$315.821,832,400
2015-08-18$312.13$312.131,213,400
2015-08-17$316.08$316.081,607,200
2015-08-14$312.61$312.612,006,900
2015-08-13$313.91$313.911,316,300
2015-08-12$316.73$316.731,962,800
2015-08-11$314.85$314.851,851,600
2015-08-10$314.94$314.942,452,900
2015-08-07$309.00$309.004,259,000
2015-08-06$316.60$316.603,830,000
2015-08-05$335.41$335.412,308,000
2015-08-04$330.38$330.383,586,200
2015-08-03$324.38$324.383,024,800
2015-07-31$318.78$318.782,261,500
2015-07-30$317.00$317.002,303,900
2015-07-29$313.34$313.343,278,000
2015-07-28$319.93$319.933,547,000
2015-07-27$309.43$309.439,975,000
2015-07-24$300.03$300.0316,634,100
2015-07-23$385.05$385.052,602,500
2015-07-22$391.74$391.744,053,500
2015-07-21$409.50$409.501,768,700
2015-07-20$408.93$408.931,816,600
2015-07-17$404.66$404.661,890,300
2015-07-16$403.73$403.731,335,500
2015-07-15$400.55$400.551,471,800
2015-07-14$400.20$400.201,507,200
2015-07-13$391.23$391.231,517,900
2015-07-10$388.23$388.233,887,500
2015-07-09$399.29$399.291,325,300
2015-07-08$397.68$397.681,312,900
2015-07-07$408.06$408.061,488,900
2015-07-06$404.63$404.631,189,700
2015-07-02$404.28$404.28928,600
2015-07-01$405.41$405.41992,500
2015-06-30$403.94$403.941,582,200
2015-06-29$396.21$396.211,474,100
2015-06-26$408.73$408.73958,700
2015-06-25$411.29$411.29902,000
2015-06-24$410.65$410.65990,600
2015-06-23$416.26$416.261,081,300
2015-06-22$417.57$417.571,185,800
2015-06-19$411.05$411.052,951,900
2015-06-18$401.55$401.551,677,400
2015-06-17$390.86$390.86920,900
2015-06-16$388.28$388.28930,900
2015-06-15$388.28$388.281,048,000
2015-06-12$388.77$388.771,078,400
2015-06-11$393.54$393.541,323,300
2015-06-10$388.50$388.501,573,300
2015-06-09$382.00$382.001,260,800
2015-06-08$386.37$386.37777,000
2015-06-05$387.86$387.86998,800
2015-06-04$384.34$384.341,527,600
2015-06-03$387.48$387.481,281,500
2015-06-02$387.62$387.621,947,100
2015-06-01$393.35$393.351,192,600
2015-05-29$396.99$396.991,303,100
2015-05-28$400.10$400.10789,100
2015-05-27$402.92$402.921,117,000
2015-05-26$392.88$392.88899,800
2015-05-22$398.68$398.68829,800
2015-05-21$401.15$401.15859,000
2015-05-20$401.00$401.001,478,500
2015-05-19$395.17$395.171,347,000
2015-05-18$395.42$395.42995,700
2015-05-15$391.24$391.241,442,900
2015-05-14$394.35$394.351,612,600
2015-05-13$390.04$390.041,169,500
2015-05-12$395.30$395.301,142,500
2015-05-11$396.91$396.911,574,400
2015-05-08$398.43$398.432,037,800
2015-05-07$383.29$383.291,298,100
2015-05-06$383.56$383.561,279,700
2015-05-05$385.80$385.801,594,800
2015-05-04$386.22$386.221,456,400
2015-05-01$386.22$386.222,737,400
2015-04-30$373.93$373.932,685,900
2015-04-29$383.78$383.783,255,600
2015-04-28$374.68$374.684,923,900
2015-04-27$389.27$389.273,432,000
2015-04-24$401.71$401.716,084,400
2015-04-23$430.28$430.281,938,200
2015-04-22$423.57$423.571,298,200
2015-04-21$422.11$422.111,224,600
2015-04-20$422.92$422.921,183,300
2015-04-17$419.44$419.441,837,600
2015-04-16$428.65$428.651,109,000
2015-04-15$430.96$430.962,038,100
2015-04-14$423.57$423.571,365,100
2015-04-13$423.36$423.361,263,300
2015-04-10$425.65$425.651,063,000
2015-04-09$426.63$426.631,340,900
2015-04-08$425.36$425.361,540,100
2015-04-07$418.09$418.091,571,900
2015-04-06$413.42$413.421,873,800
2015-04-02$412.44$412.441,700,700
2015-04-01$413.81$413.812,709,200
2015-03-31$422.24$422.241,808,700
2015-03-30$431.62$431.621,600,100
2015-03-27$429.87$429.871,859,200
2015-03-26$428.93$428.933,353,800
2015-03-25$431.63$431.633,743,700
2015-03-24$452.71$452.712,481,400
2015-03-23$463.73$463.733,712,600
2015-03-20$475.98$475.9810,643,200
2015-03-19$433.65$433.652,471,900
2015-03-18$427.93$427.932,030,300
2015-03-17$426.12$426.121,968,900
2015-03-16$421.32$421.321,564,500
2015-03-13$413.35$413.351,744,700
2015-03-12$407.64$407.641,553,200
2015-03-11$408.11$408.111,426,100
2015-03-10$414.20$414.201,400,700
2015-03-09$415.51$415.511,516,100
2015-03-06$417.63$417.631,643,700
2015-03-05$425.61$425.611,846,200
2015-03-04$414.13$414.131,523,000
2015-03-03$412.79$412.791,235,300
2015-03-02$415.79$415.791,347,300
2015-02-27$409.59$409.591,371,000
2015-02-26$410.10$410.10863,800
2015-02-25$408.94$408.941,114,100
2015-02-24$404.89$404.89855,200
2015-02-23$408.58$408.58954,400
2015-02-20$408.05$408.05945,900
2015-02-19$406.73$406.731,143,500
2015-02-18$401.12$401.12782,800
2015-02-17$397.91$397.911,321,100
2015-02-13$391.66$391.661,180,000
2015-02-12$392.11$392.111,755,100
2015-02-11$390.00$390.001,766,300
2015-02-10$395.13$395.131,811,600
2015-02-09$396.88$396.881,440,400
2015-02-06$402.00$402.001,640,500
2015-02-05$401.79$401.791,576,200
2015-02-04$391.12$391.122,165,000
2015-02-03$393.89$393.891,781,500
2015-02-02$390.00$390.001,832,700
2015-01-30$389.16$389.164,029,800
2015-01-29$353.25$353.251,707,800
2015-01-28$351.18$351.181,486,000
2015-01-27$357.89$357.891,446,300
2015-01-26$362.44$362.441,330,600
2015-01-23$357.53$357.531,077,700
2015-01-22$353.65$353.652,322,900
2015-01-21$361.83$361.831,337,000
2015-01-20$363.28$363.282,076,400
2015-01-16$352.75$352.751,673,000
2015-01-15$339.88$339.881,665,700
2015-01-14$348.75$348.751,429,900
2015-01-13$352.74$352.742,489,400
2015-01-12$347.84$347.841,899,200
2015-01-09$342.34$342.342,562,100
2015-01-08$350.25$350.254,277,700
2015-01-07$353.24$353.242,484,300
2015-01-06$334.65$334.651,898,200
2015-01-05$336.74$336.741,250,000
2015-01-02$342.01$342.01976,300