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 — 2014

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2014-12-31$339.45$339.45864,800
2014-12-30$342.19$342.19933,500
2014-12-29$343.43$343.431,236,100
2014-12-26$342.40$342.401,138,700
2014-12-24$340.89$340.89965,800
2014-12-23$335.76$335.762,631,500
2014-12-22$352.29$352.292,170,400
2014-12-19$360.67$360.673,691,300
2014-12-18$353.70$353.702,401,800
2014-12-17$332.89$332.891,652,700
2014-12-16$325.13$325.131,834,400
2014-12-15$335.80$335.801,402,800
2014-12-12$344.49$344.491,559,100
2014-12-11$342.33$342.331,471,700
2014-12-10$343.59$343.591,449,200
2014-12-09$347.61$347.611,295,500
2014-12-08$344.05$344.051,395,400
2014-12-05$340.87$340.871,460,300
2014-12-04$341.18$341.182,533,600
2014-12-03$347.34$347.344,668,700
2014-12-02$328.27$328.276,209,500
2014-12-01$308.44$308.441,146,100
2014-11-28$307.69$307.69849,100
2014-11-26$304.92$304.921,085,800
2014-11-25$305.40$305.401,947,200
2014-11-24$306.74$306.741,388,200
2014-11-21$303.55$303.551,828,000
2014-11-20$299.10$299.101,772,400
2014-11-19$303.61$303.611,956,800
2014-11-18$305.56$305.561,643,200
2014-11-17$302.42$302.421,390,200
2014-11-14$305.43$305.432,557,300
2014-11-13$317.98$317.981,126,200
2014-11-12$321.02$321.02757,000
2014-11-11$324.59$324.59847,500
2014-11-10$327.87$327.871,220,500
2014-11-07$320.75$320.751,102,800
2014-11-06$323.47$323.471,377,000
2014-11-05$319.55$319.551,016,100
2014-11-04$322.06$322.061,130,700
2014-11-03$321.25$321.251,196,100
2014-10-31$321.08$321.081,699,600
2014-10-30$321.00$321.001,084,400
2014-10-29$315.06$315.061,509,000
2014-10-28$318.03$318.031,642,000
2014-10-27$319.98$319.981,114,800
2014-10-24$321.67$321.671,262,900
2014-10-23$316.06$316.062,126,200
2014-10-22$309.07$309.077,067,000
2014-10-21$326.77$326.771,851,500
2014-10-20$311.41$311.411,513,800
2014-10-17$306.71$306.711,782,200
2014-10-16$302.74$302.741,384,400
2014-10-15$305.69$305.692,210,900
2014-10-14$301.58$301.581,759,400
2014-10-13$301.74$301.742,302,500
2014-10-10$315.14$315.141,468,200
2014-10-09$319.19$319.191,142,900
2014-10-08$324.59$324.591,271,500
2014-10-07$315.92$315.921,053,300
2014-10-06$325.07$325.07722,800
2014-10-03$327.09$327.091,306,500
2014-10-02$319.84$319.841,116,300
2014-10-01$323.50$323.50985,400
2014-09-30$330.81$330.811,055,100
2014-09-29$330.16$330.16800,900
2014-09-26$333.54$333.541,075,600
2014-09-25$333.40$333.401,554,900
2014-09-24$346.30$346.301,579,200
2014-09-23$332.24$332.241,039,700
2014-09-22$329.76$329.761,027,400
2014-09-19$329.24$329.241,742,600
2014-09-18$329.99$329.99637,100
2014-09-17$327.58$327.581,088,600
2014-09-16$326.88$326.88991,200
2014-09-15$320.12$320.121,062,800
2014-09-12$323.39$323.39802,500
2014-09-11$327.11$327.11925,300
2014-09-10$332.08$332.08811,100
2014-09-09$326.83$326.83840,800
2014-09-08$331.31$331.31927,200
2014-09-05$330.48$330.481,910,600
2014-09-04$334.83$334.83827,700
2014-09-03$344.12$344.12735,700
2014-09-02$342.68$342.68715,600
2014-08-29$343.04$343.04700,100
2014-08-28$341.24$341.24643,800
2014-08-27$343.36$343.36972,100
2014-08-26$342.99$342.99836,800
2014-08-25$342.70$342.70719,300
2014-08-22$339.97$339.97677,300
2014-08-21$338.65$338.65663,700
2014-08-20$342.58$342.58700,100
2014-08-19$345.84$345.84815,700
2014-08-18$344.60$344.601,223,600
2014-08-15$342.47$342.471,722,400
2014-08-14$337.01$337.011,319,200
2014-08-13$334.64$334.641,449,200
2014-08-12$324.96$324.961,045,600
2014-08-11$320.34$320.34983,000
2014-08-08$324.05$324.051,196,900
2014-08-07$320.60$320.60872,700
2014-08-06$325.20$325.20940,600
2014-08-05$325.23$325.231,144,600
2014-08-04$326.55$326.55989,300
2014-08-01$329.83$329.831,319,300
2014-07-31$334.39$334.391,168,500
2014-07-30$344.52$344.521,303,300
2014-07-29$341.73$341.731,286,000
2014-07-28$336.39$336.39995,600
2014-07-25$335.45$335.451,068,600
2014-07-24$336.79$336.791,599,900
2014-07-23$337.60$337.604,143,000
2014-07-22$303.67$303.671,200,100
2014-07-21$302.50$302.501,027,800
2014-07-18$304.10$304.101,550,700
2014-07-17$299.29$299.291,651,300
2014-07-16$303.74$303.741,803,800
2014-07-15$312.00$312.001,391,100
2014-07-14$319.75$319.75876,500
2014-07-11$322.22$322.22946,900
2014-07-10$319.12$319.12825,300
2014-07-09$320.14$320.141,027,100
2014-07-08$317.59$317.591,235,700
2014-07-07$325.68$325.68802,300
2014-07-03$331.15$331.15700,600
2014-07-02$331.00$331.001,183,800
2014-07-01$324.74$324.741,179,500
2014-06-30$315.31$315.31938,200
2014-06-27$318.13$318.13969,400
2014-06-26$318.63$318.631,027,500
2014-06-25$314.76$314.761,051,700
2014-06-24$314.23$314.231,105,200
2014-06-23$313.46$313.46889,100
2014-06-20$319.59$319.592,088,800
2014-06-19$311.98$311.981,034,500
2014-06-18$309.81$309.811,068,300
2014-06-17$304.79$304.79860,400
2014-06-16$307.97$307.97890,700
2014-06-13$309.98$309.98773,200
2014-06-12$309.78$309.78802,700
2014-06-11$310.72$310.72909,700
2014-06-10$315.44$315.441,015,900
2014-06-09$318.16$318.16775,200
2014-06-06$317.55$317.55872,800
2014-06-05$320.13$320.131,116,900
2014-06-04$319.18$319.18740,600
2014-06-03$316.86$316.86786,200
2014-06-02$318.22$318.22754,700
2014-05-30$319.37$319.371,294,400
2014-05-29$319.85$319.851,769,500
2014-05-28$308.81$308.811,160,400
2014-05-27$309.77$309.771,308,500
2014-05-23$299.71$299.71883,200
2014-05-22$299.69$299.691,092,400
2014-05-21$295.36$295.36979,100
2014-05-20$289.79$289.791,089,000
2014-05-19$290.75$290.75772,800
2014-05-16$291.32$291.321,148,100
2014-05-15$289.53$289.531,311,000
2014-05-14$296.50$296.501,030,700
2014-05-13$295.85$295.85988,800
2014-05-12$300.54$300.541,683,400
2014-05-09$286.65$286.651,084,300
2014-05-08$282.96$282.961,230,200
2014-05-07$284.00$284.001,379,600
2014-05-06$285.94$285.941,236,900
2014-05-05$290.06$290.061,177,900
2014-05-02$282.01$282.011,284,800
2014-05-01$286.75$286.751,312,700
2014-04-30$287.12$287.121,452,100
2014-04-29$290.84$290.841,634,500
2014-04-28$283.12$283.121,802,300
2014-04-25$285.81$285.811,727,700
2014-04-24$294.84$294.842,385,300
2014-04-23$306.75$306.752,594,700
2014-04-22$306.20$306.201,776,700
2014-04-21$297.98$297.98984,400
2014-04-17$290.54$290.541,283,400
2014-04-16$291.48$291.481,768,200
2014-04-15$285.49$285.491,871,100
2014-04-14$279.52$279.521,880,100
2014-04-11$274.00$274.002,742,500
2014-04-10$287.35$287.352,635,700
2014-04-09$300.68$300.681,988,700
2014-04-08$285.92$285.922,502,900
2014-04-07$294.19$294.192,427,600
2014-04-04$288.27$288.273,288,600
2014-04-03$301.86$301.862,008,100
2014-04-02$309.70$309.701,483,700
2014-04-01$309.79$309.791,714,800
2014-03-31$305.87$305.871,952,500
2014-03-28$294.12$294.122,555,300
2014-03-27$309.76$309.762,021,100
2014-03-26$305.93$305.931,975,900
2014-03-25$311.78$311.782,148,600
2014-03-24$312.60$312.603,748,000
2014-03-21$318.53$318.535,748,300
2014-03-20$347.04$347.041,369,100
2014-03-19$350.01$350.011,341,500
2014-03-18$351.94$351.941,511,100
2014-03-17$345.60$345.601,561,000
2014-03-14$332.49$332.491,330,400
2014-03-13$332.05$332.051,064,900
2014-03-12$339.55$339.55879,300
2014-03-11$335.99$335.991,025,600
2014-03-10$338.00$338.001,471,000
2014-03-07$328.75$328.752,785,600
2014-03-06$340.69$340.692,233,200
2014-03-05$339.00$339.001,003,300
2014-03-04$343.15$343.151,107,500
2014-03-03$338.38$338.381,340,400
2014-02-28$340.68$340.681,861,900
2014-02-27$343.86$343.861,149,800
2014-02-26$343.21$343.211,192,400
2014-02-25$346.30$346.301,350,500
2014-02-24$345.63$345.631,668,100
2014-02-21$347.11$347.111,814,700
2014-02-20$335.11$335.111,317,200
2014-02-19$328.45$328.45825,700
2014-02-18$334.98$334.98966,900
2014-02-14$328.29$328.291,054,300
2014-02-13$328.62$328.621,311,400
2014-02-12$323.04$323.041,461,200
2014-02-11$319.82$319.821,564,600
2014-02-10$317.96$317.961,249,800
2014-02-07$315.54$315.541,504,600
2014-02-06$301.01$301.011,384,600
2014-02-05$299.93$299.931,887,900
2014-02-04$308.18$308.182,141,100
2014-02-03$300.39$300.392,205,400
2014-01-31$312.64$312.641,312,900
2014-01-30$318.28$318.281,812,000
2014-01-29$305.46$305.462,773,800
2014-01-28$305.65$305.651,723,700
2014-01-27$297.88$297.881,515,300
2014-01-24$303.60$303.601,926,700
2014-01-23$314.96$314.961,578,700
2014-01-22$310.54$310.541,125,200
2014-01-21$310.50$310.501,793,100
2014-01-17$297.48$297.481,413,600
2014-01-16$294.00$294.001,051,200
2014-01-15$296.72$296.721,038,700
2014-01-14$297.47$297.471,651,400
2014-01-13$283.67$283.672,305,500
2014-01-10$299.31$299.311,866,900
2014-01-09$289.75$289.751,318,700
2014-01-08$290.01$290.011,436,200
2014-01-07$273.52$273.52819,100
2014-01-06$274.97$274.971,019,000
2014-01-03$277.40$277.40656,000
2014-01-02$280.33$280.33902,200