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 — 2017

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2017-12-29$318.57$318.57619,500
2017-12-28$320.33$320.33660,000
2017-12-27$320.07$320.07600,900
2017-12-26$319.78$319.78653,600
2017-12-22$319.50$319.50887,000
2017-12-21$322.52$322.522,212,900
2017-12-20$333.47$333.471,276,500
2017-12-19$327.02$327.02866,700
2017-12-18$325.95$325.95990,800
2017-12-15$327.94$327.942,023,500
2017-12-14$323.55$323.551,173,900
2017-12-13$330.71$330.711,129,200
2017-12-12$327.75$327.75747,400
2017-12-11$328.03$328.031,142,800
2017-12-08$325.77$325.771,133,900
2017-12-07$319.57$319.57987,100
2017-12-06$314.66$314.66938,800
2017-12-05$319.87$319.87915,600
2017-12-04$317.40$317.40908,700
2017-12-01$319.35$319.351,207,500
2017-11-30$322.17$322.171,186,200
2017-11-29$319.96$319.961,360,800
2017-11-28$317.14$317.141,100,700
2017-11-27$311.73$311.731,353,300
2017-11-24$308.97$308.97514,000
2017-11-22$309.80$309.80732,500
2017-11-21$309.06$309.061,281,600
2017-11-20$309.46$309.46667,200
2017-11-17$313.97$313.97907,400
2017-11-16$313.98$313.98731,700
2017-11-15$310.28$310.281,294,000
2017-11-14$309.69$309.691,214,300
2017-11-13$315.71$315.711,186,800
2017-11-10$310.44$310.44820,700
2017-11-09$309.96$309.96895,400
2017-11-08$312.58$312.581,231,900
2017-11-07$313.57$313.57887,500
2017-11-06$315.47$315.471,065,200
2017-11-03$314.14$314.14828,000
2017-11-02$309.40$309.401,570,900
2017-11-01$315.73$315.731,386,200
2017-10-31$311.66$311.661,201,600
2017-10-30$315.80$315.801,469,600
2017-10-27$307.74$307.741,679,800
2017-10-26$307.64$307.641,905,300
2017-10-25$314.64$314.641,879,900
2017-10-24$315.73$315.735,849,300
2017-10-23$328.55$328.551,885,200
2017-10-20$338.10$338.101,909,300
2017-10-19$342.42$342.421,291,800
2017-10-18$344.58$344.581,246,700
2017-10-17$344.47$344.471,616,300
2017-10-16$335.68$335.681,176,600
2017-10-13$337.64$337.641,360,300
2017-10-12$333.31$333.311,120,200
2017-10-11$333.19$333.19938,900
2017-10-10$332.83$332.831,004,000
2017-10-09$329.01$329.01902,400
2017-10-06$327.48$327.481,039,000
2017-10-05$326.74$326.742,159,800
2017-10-04$314.92$314.921,067,600
2017-10-03$317.39$317.39850,900
2017-10-02$316.17$316.171,674,000
2017-09-29$313.12$313.121,647,600
2017-09-28$310.00$310.00957,200
2017-09-27$312.80$312.801,086,400
2017-09-26$317.06$317.06944,300
2017-09-25$317.51$317.511,284,600
2017-09-22$318.46$318.46988,100
2017-09-21$315.03$315.03934,700
2017-09-20$319.00$319.00849,500
2017-09-19$317.93$317.93779,300
2017-09-18$318.18$318.181,001,800
2017-09-15$321.26$321.262,235,400
2017-09-14$323.66$323.661,136,400
2017-09-13$324.05$324.051,160,900
2017-09-12$329.69$329.691,045,600
2017-09-11$326.54$326.541,301,300
2017-09-08$326.33$326.331,429,800
2017-09-07$323.90$323.901,571,600
2017-09-06$317.36$317.361,535,300
2017-09-05$315.83$315.831,660,500
2017-09-01$321.01$321.012,083,900
2017-08-31$316.56$316.562,503,600
2017-08-30$303.75$303.751,916,800
2017-08-29$293.58$293.58903,300
2017-08-28$292.30$292.301,447,800
2017-08-25$285.06$285.06900,500
2017-08-24$285.45$285.45801,500
2017-08-23$282.64$282.641,047,400
2017-08-22$286.72$286.72945,000
2017-08-21$283.15$283.15850,300
2017-08-18$281.77$281.77814,100
2017-08-17$284.42$284.421,590,600
2017-08-16$294.08$294.081,684,300
2017-08-15$287.92$287.92861,700
2017-08-14$286.05$286.05786,800
2017-08-11$283.68$283.68727,200
2017-08-10$281.15$281.151,378,000
2017-08-09$288.74$288.74777,500
2017-08-08$289.26$289.26931,200
2017-08-07$291.01$291.011,035,600
2017-08-04$288.27$288.27746,000
2017-08-03$286.09$286.09882,800
2017-08-02$288.00$288.001,279,400
2017-08-01$291.15$291.151,195,400
2017-07-31$289.59$289.591,272,200
2017-07-28$287.44$287.44869,200
2017-07-27$287.95$287.951,721,500
2017-07-26$295.61$295.613,014,600
2017-07-25$282.96$282.963,110,000
2017-07-24$284.70$284.701,476,200
2017-07-21$282.92$282.92985,400
2017-07-20$281.44$281.441,049,200
2017-07-19$281.95$281.951,103,500
2017-07-18$282.60$282.601,126,700
2017-07-17$282.65$282.651,531,200
2017-07-14$280.81$280.81921,000
2017-07-13$278.36$278.361,422,500
2017-07-12$275.08$275.081,406,500
2017-07-11$271.76$271.76922,700
2017-07-10$273.58$273.58942,200
2017-07-07$273.93$273.93906,300
2017-07-06$271.96$271.961,309,700
2017-07-05$277.71$277.711,326,300
2017-07-03$272.52$272.52612,500
2017-06-30$271.36$271.361,373,000
2017-06-29$271.88$271.881,035,300
2017-06-28$274.64$274.641,171,900
2017-06-27$271.25$271.251,731,500
2017-06-26$279.81$279.811,279,500
2017-06-23$280.32$280.322,439,600
2017-06-22$280.57$280.572,838,900
2017-06-21$278.60$278.603,158,500
2017-06-20$266.00$266.002,250,200
2017-06-19$260.54$260.541,956,200
2017-06-16$251.74$251.742,427,200
2017-06-15$255.02$255.021,443,700
2017-06-14$253.37$253.373,067,600
2017-06-13$261.42$261.421,312,400
2017-06-12$262.11$262.111,576,700
2017-06-09$259.89$259.891,575,900
2017-06-08$257.17$257.171,141,200
2017-06-07$255.43$255.431,153,200
2017-06-06$257.16$257.161,080,700
2017-06-05$258.50$258.501,579,600
2017-06-02$256.65$256.651,731,800
2017-06-01$252.38$252.381,548,100
2017-05-31$247.77$247.771,893,500
2017-05-30$246.54$246.541,366,800
2017-05-26$250.80$250.80833,100
2017-05-25$252.97$252.971,552,300
2017-05-24$253.33$253.332,225,100
2017-05-23$248.10$248.101,006,000
2017-05-22$250.04$250.041,331,200
2017-05-19$250.09$250.091,989,800
2017-05-18$252.81$252.811,242,600
2017-05-17$251.34$251.341,413,500
2017-05-16$257.64$257.641,049,700
2017-05-15$258.53$258.531,653,600
2017-05-12$254.84$254.841,119,800
2017-05-11$254.15$254.151,850,600
2017-05-10$257.92$257.921,503,600
2017-05-09$261.28$261.281,159,200
2017-05-08$260.42$260.421,985,500
2017-05-05$262.15$262.151,914,100
2017-05-04$268.60$268.601,143,400
2017-05-03$271.36$271.36929,000
2017-05-02$271.34$271.341,384,300
2017-05-01$271.03$271.031,151,100
2017-04-28$271.21$271.211,803,400
2017-04-27$276.57$276.572,268,500
2017-04-26$279.98$279.982,146,700
2017-04-25$286.89$286.893,126,300
2017-04-24$276.86$276.862,007,300
2017-04-21$272.94$272.941,127,600
2017-04-20$272.46$272.46981,200
2017-04-19$271.94$271.941,190,300
2017-04-18$271.16$271.161,379,500
2017-04-17$274.05$274.051,025,800
2017-04-13$271.88$271.881,173,800
2017-04-12$268.92$268.921,058,100
2017-04-11$268.65$268.651,247,200
2017-04-10$269.30$269.30861,000
2017-04-07$268.73$268.731,677,600
2017-04-06$270.94$270.941,622,600
2017-04-05$270.44$270.441,340,200
2017-04-04$274.24$274.241,086,200
2017-04-03$272.69$272.691,589,000
2017-03-31$273.42$273.422,747,400
2017-03-30$269.06$269.061,448,700
2017-03-29$268.53$268.532,632,200
2017-03-28$274.11$274.111,149,400
2017-03-27$275.23$275.231,132,900
2017-03-24$274.82$274.821,368,200
2017-03-23$275.41$275.411,605,000
2017-03-22$277.87$277.871,333,600
2017-03-21$275.79$275.793,841,600
2017-03-20$274.80$274.801,666,900
2017-03-17$276.09$276.093,140,200
2017-03-16$278.96$278.963,870,900
2017-03-15$292.64$292.641,376,000
2017-03-14$292.47$292.47797,700
2017-03-13$292.95$292.951,291,500
2017-03-10$292.24$292.241,303,700
2017-03-09$293.06$293.061,281,200
2017-03-08$294.09$294.091,243,600
2017-03-07$291.10$291.101,298,400
2017-03-06$295.66$295.661,395,600
2017-03-03$297.85$297.851,170,700
2017-03-02$293.59$293.591,282,400
2017-03-01$293.26$293.261,319,700
2017-02-28$288.60$288.601,251,300
2017-02-27$291.13$291.131,295,100
2017-02-24$285.13$285.131,768,500
2017-02-23$284.75$284.751,418,900
2017-02-22$287.63$287.631,046,000
2017-02-21$286.90$286.901,471,200
2017-02-17$288.94$288.942,022,900
2017-02-16$290.13$290.131,834,900
2017-02-15$292.64$292.642,601,200
2017-02-14$285.14$285.142,404,500
2017-02-13$278.91$278.911,795,500
2017-02-10$274.76$274.761,648,900
2017-02-09$270.44$270.441,399,100
2017-02-08$268.74$268.741,922,600
2017-02-07$266.11$266.111,546,900
2017-02-06$264.91$264.911,619,100
2017-02-03$264.67$264.671,537,500
2017-02-02$264.23$264.232,733,900
2017-02-01$281.69$281.691,699,500
2017-01-31$277.24$277.241,856,400
2017-01-30$276.06$276.061,300,300
2017-01-27$278.21$278.211,353,400
2017-01-26$278.89$278.892,419,000
2017-01-25$273.24$273.242,506,100
2017-01-24$273.82$273.821,975,200
2017-01-23$276.02$276.021,858,000
2017-01-20$280.66$280.661,979,100
2017-01-19$280.35$280.351,421,500
2017-01-18$283.61$283.611,079,700
2017-01-17$283.01$283.011,971,100
2017-01-13$284.75$284.751,711,500
2017-01-12$287.77$287.771,354,700
2017-01-11$287.11$287.112,450,500
2017-01-10$297.79$297.791,408,400
2017-01-09$299.02$299.021,430,500
2017-01-06$295.00$295.001,082,500
2017-01-05$293.57$293.571,318,600
2017-01-04$294.05$294.051,273,500
2017-01-03$291.71$291.711,763,400