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 — 2019

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2019-12-31$296.73$296.73810,100
2019-12-30$296.01$296.01873,200
2019-12-27$300.09$300.09677,100
2019-12-26$301.79$301.79738,200
2019-12-24$304.07$304.07433,700
2019-12-23$301.56$301.561,542,200
2019-12-20$301.05$301.053,949,700
2019-12-19$297.58$297.581,472,400
2019-12-18$296.61$296.611,790,800
2019-12-17$297.11$297.111,360,300
2019-12-16$301.40$301.401,398,700
2019-12-13$296.83$296.831,946,100
2019-12-12$293.85$293.851,951,100
2019-12-11$292.23$292.231,313,900
2019-12-10$297.20$297.201,227,200
2019-12-09$295.55$295.552,077,000
2019-12-06$300.26$300.262,261,100
2019-12-05$299.39$299.395,988,600
2019-12-04$289.52$289.521,736,200
2019-12-03$290.70$290.701,644,900
2019-12-02$292.39$292.391,822,200
2019-11-29$299.81$299.81944,600
2019-11-27$303.35$303.351,369,900
2019-11-26$302.99$302.992,417,200
2019-11-25$302.61$302.612,226,100
2019-11-22$299.08$299.083,288,200
2019-11-21$288.46$288.461,292,400
2019-11-20$285.40$285.401,409,600
2019-11-19$285.43$285.432,001,500
2019-11-18$282.62$282.621,626,700
2019-11-15$282.27$282.271,922,200
2019-11-14$275.15$275.152,354,800
2019-11-13$281.89$281.891,910,300
2019-11-12$291.40$291.401,860,900
2019-11-11$294.14$294.141,007,700
2019-11-08$293.25$293.251,477,100
2019-11-07$286.87$286.871,430,700
2019-11-06$289.00$289.001,306,400
2019-11-05$292.18$292.181,374,600
2019-11-04$293.43$293.431,576,200
2019-11-01$299.20$299.201,463,300
2019-10-31$298.71$298.711,959,900
2019-10-30$299.89$299.892,146,500
2019-10-29$297.50$297.502,391,300
2019-10-28$295.54$295.542,395,100
2019-10-25$288.04$288.042,163,900
2019-10-24$285.68$285.682,803,200
2019-10-23$278.82$278.825,522,400
2019-10-22$281.87$281.8721,843,100
2019-10-21$223.51$223.512,358,100
2019-10-18$220.06$220.062,801,700
2019-10-17$225.60$225.601,776,600
2019-10-16$227.72$227.721,365,300
2019-10-15$226.06$226.061,976,600
2019-10-14$225.76$225.762,553,900
2019-10-11$223.21$223.212,388,300
2019-10-10$223.00$223.001,471,200
2019-10-09$222.13$222.131,429,300
2019-10-08$221.94$221.941,973,700
2019-10-07$226.99$226.991,572,000
2019-10-04$224.00$224.001,214,600
2019-10-03$222.50$222.501,827,500
2019-10-02$221.26$221.261,990,800
2019-10-01$227.20$227.201,805,800
2019-09-30$232.82$232.821,182,400
2019-09-27$230.22$230.221,340,200
2019-09-26$230.22$230.221,647,200
2019-09-25$235.90$235.901,148,700
2019-09-24$236.20$236.201,545,300
2019-09-23$239.96$239.961,317,800
2019-09-20$238.79$238.793,577,300
2019-09-19$235.62$235.621,237,800
2019-09-18$235.17$235.171,562,400
2019-09-17$238.70$238.701,205,700
2019-09-16$236.12$236.121,598,400
2019-09-13$236.63$236.631,689,000
2019-09-12$232.31$232.311,953,500
2019-09-11$235.96$235.961,823,600
2019-09-10$233.00$233.001,718,900
2019-09-09$230.00$230.001,651,800
2019-09-06$224.57$224.571,201,300
2019-09-05$223.96$223.961,491,900
2019-09-04$219.29$219.291,166,200
2019-09-03$217.44$217.441,385,000
2019-08-30$219.75$219.751,226,300
2019-08-29$220.16$220.161,175,300
2019-08-28$221.07$221.071,408,200
2019-08-27$220.79$220.791,564,000
2019-08-26$223.76$223.76983,600
2019-08-23$225.85$225.851,288,100
2019-08-22$232.06$232.06732,900
2019-08-21$233.18$233.18807,500
2019-08-20$231.28$231.28843,600
2019-08-19$235.72$235.721,021,800
2019-08-16$231.68$231.68953,900
2019-08-15$227.63$227.631,034,400
2019-08-14$226.72$226.721,390,900
2019-08-13$233.23$233.231,067,400
2019-08-12$230.96$230.961,233,700
2019-08-09$235.80$235.801,036,000
2019-08-08$238.23$238.231,651,400
2019-08-07$237.58$237.581,169,400
2019-08-06$240.17$240.171,389,900
2019-08-05$235.21$235.211,327,000
2019-08-02$242.27$242.271,111,100
2019-08-01$243.06$243.061,871,000
2019-07-31$237.82$237.821,074,900
2019-07-30$241.51$241.511,215,900
2019-07-29$237.11$237.11883,600
2019-07-26$238.21$238.211,544,500
2019-07-25$238.21$238.21932,800
2019-07-24$241.24$241.241,565,000
2019-07-23$243.88$243.883,295,000
2019-07-22$232.48$232.481,274,700
2019-07-19$231.27$231.271,315,700
2019-07-18$232.23$232.231,195,800
2019-07-17$229.44$229.44851,700
2019-07-16$231.55$231.551,207,200
2019-07-15$233.62$233.621,028,300
2019-07-12$231.42$231.421,248,700
2019-07-11$231.60$231.601,421,200
2019-07-10$232.43$232.431,281,400
2019-07-09$234.22$234.221,235,600
2019-07-08$230.84$230.841,539,900
2019-07-05$234.25$234.251,264,500
2019-07-03$238.27$238.27680,200
2019-07-02$236.37$236.371,401,100
2019-07-01$235.49$235.491,866,900
2019-06-28$233.87$233.873,667,500
2019-06-27$239.77$239.772,124,700
2019-06-26$238.07$238.071,872,600
2019-06-25$240.29$240.292,108,700
2019-06-24$235.91$235.911,435,300
2019-06-21$239.09$239.093,065,000
2019-06-20$234.97$234.971,910,600
2019-06-19$233.89$233.891,802,500
2019-06-18$233.01$233.011,646,000
2019-06-17$231.78$231.781,669,000
2019-06-14$227.67$227.671,475,800
2019-06-13$231.26$231.261,166,100
2019-06-12$230.43$230.431,238,600
2019-06-11$229.08$229.081,296,900
2019-06-10$228.40$228.401,312,800
2019-06-07$227.23$227.231,428,700
2019-06-06$224.35$224.351,641,700
2019-06-05$226.09$226.091,378,100
2019-06-04$227.00$227.001,446,200
2019-06-03$223.37$223.371,714,600
2019-05-31$219.29$219.291,649,800
2019-05-30$223.78$223.781,071,300
2019-05-29$223.40$223.401,549,700
2019-05-28$225.54$225.541,876,200
2019-05-24$227.06$227.061,792,500
2019-05-23$229.11$229.112,120,700
2019-05-22$235.04$235.041,478,000
2019-05-21$232.92$232.921,531,100
2019-05-20$230.76$230.762,004,400
2019-05-17$229.28$229.281,893,300
2019-05-16$230.87$230.871,447,500
2019-05-15$230.59$230.591,394,300
2019-05-14$229.18$229.181,905,700
2019-05-13$225.66$225.661,799,300
2019-05-10$226.23$226.231,899,500
2019-05-09$228.47$228.472,108,500
2019-05-08$230.98$230.982,087,500
2019-05-07$229.02$229.023,150,300
2019-05-06$236.07$236.072,368,700
2019-05-03$231.18$231.182,382,300
2019-05-02$230.52$230.521,965,600
2019-05-01$229.50$229.501,666,100
2019-04-30$229.24$229.241,914,000
2019-04-29$229.38$229.381,517,800
2019-04-26$230.53$230.531,660,800
2019-04-25$229.89$229.892,547,800
2019-04-24$224.40$224.404,123,900
2019-04-23$230.21$230.212,557,300
2019-04-22$228.81$228.811,802,900
2019-04-18$226.39$226.392,761,000
2019-04-17$227.18$227.182,507,500
2019-04-16$228.72$228.722,425,000
2019-04-15$232.37$232.371,753,400
2019-04-12$234.50$234.502,001,800
2019-04-11$233.83$233.832,875,600
2019-04-10$240.28$240.281,612,600
2019-04-09$237.58$237.582,146,200
2019-04-08$239.74$239.742,088,000
2019-04-05$241.72$241.723,250,300
2019-04-04$235.04$235.042,629,700
2019-04-03$231.40$231.403,937,400
2019-04-02$233.27$233.273,337,100
2019-04-01$232.49$232.493,504,200
2019-03-29$236.38$236.382,697,200
2019-03-28$232.82$232.822,856,400
2019-03-27$229.95$229.954,041,500
2019-03-26$232.91$232.916,808,300
2019-03-25$220.26$220.265,968,600
2019-03-22$216.71$216.718,490,900
2019-03-21$226.88$226.8821,621,700
2019-03-20$320.59$320.59993,400
2019-03-19$323.76$323.761,081,900
2019-03-18$325.65$325.651,055,800
2019-03-15$329.87$329.872,368,100
2019-03-14$321.52$321.521,157,500
2019-03-13$320.56$320.561,107,200
2019-03-12$312.72$312.721,332,200
2019-03-11$311.46$311.461,491,700
2019-03-08$307.93$307.931,602,100
2019-03-07$315.29$315.291,078,700
2019-03-06$317.97$317.971,007,800
2019-03-05$326.87$326.871,020,400
2019-03-04$327.26$327.261,046,900
2019-03-01$334.10$334.10906,100
2019-02-28$328.01$328.01752,900
2019-02-27$328.89$328.89598,500
2019-02-26$327.62$327.62742,900
2019-02-25$327.48$327.48839,000
2019-02-22$325.33$325.331,030,000
2019-02-21$321.17$321.171,441,200
2019-02-20$335.16$335.16859,900
2019-02-19$333.00$333.00946,800
2019-02-15$332.87$332.871,435,700
2019-02-14$324.71$324.711,245,900
2019-02-13$321.54$321.541,136,800
2019-02-12$319.43$319.431,082,700
2019-02-11$316.87$316.871,360,900
2019-02-08$315.12$315.121,633,700
2019-02-07$308.73$308.732,786,600
2019-02-06$333.24$333.24934,500
2019-02-05$336.99$336.991,281,400
2019-02-04$334.07$334.07990,700
2019-02-01$330.91$330.911,180,900
2019-01-31$333.78$333.781,419,200
2019-01-30$327.86$327.862,387,900
2019-01-29$334.48$334.481,645,700
2019-01-28$330.01$330.011,230,500
2019-01-25$336.77$336.77971,500
2019-01-24$332.87$332.871,090,900
2019-01-23$337.22$337.221,046,800
2019-01-22$338.96$338.961,448,400
2019-01-18$337.42$337.421,270,800
2019-01-17$338.34$338.341,004,700
2019-01-16$332.03$332.031,232,100
2019-01-15$337.54$337.54982,200
2019-01-14$330.42$330.42952,500
2019-01-11$333.21$333.211,317,800
2019-01-10$331.19$331.19845,800
2019-01-09$326.63$326.631,223,600
2019-01-08$324.44$324.441,008,100
2019-01-07$322.40$322.401,316,500
2019-01-04$318.33$318.331,532,600
2019-01-03$307.00$307.002,148,600
2019-01-02$304.69$304.691,336,500