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 — 2023

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2023-12-29$258.77$258.77802,800
2023-12-28$260.58$260.58756,000
2023-12-27$261.93$261.93624,300
2023-12-26$260.70$260.70550,200
2023-12-22$257.97$257.97689,600
2023-12-21$253.86$253.86940,000
2023-12-20$248.16$248.16755,900
2023-12-19$251.69$251.691,263,400
2023-12-18$250.33$250.331,641,900
2023-12-15$248.13$248.133,862,400
2023-12-14$256.54$256.541,913,100
2023-12-13$255.56$255.561,613,100
2023-12-12$249.04$249.041,228,800
2023-12-11$246.11$246.111,428,400
2023-12-08$239.29$239.29988,000
2023-12-07$239.12$239.121,221,300
2023-12-06$233.87$233.87950,300
2023-12-05$229.57$229.57861,300
2023-12-04$232.85$232.85945,600
2023-12-01$234.64$234.64734,900
2023-11-30$234.08$234.081,492,700
2023-11-29$232.06$232.061,463,600
2023-11-28$227.41$227.41802,200
2023-11-27$228.79$228.79814,900
2023-11-24$231.95$231.95396,400
2023-11-22$231.25$231.25505,500
2023-11-21$229.57$229.57696,100
2023-11-20$230.11$230.11819,600
2023-11-17$228.00$228.001,447,300
2023-11-16$229.46$229.46790,700
2023-11-15$229.63$229.631,346,400
2023-11-14$225.26$225.26999,700
2023-11-13$222.59$222.59856,400
2023-11-10$224.79$224.791,330,300
2023-11-09$224.65$224.651,578,000
2023-11-08$231.69$231.692,802,000
2023-11-07$245.61$245.611,483,300
2023-11-06$248.63$248.631,061,300
2023-11-03$249.50$249.50992,600
2023-11-02$241.86$241.86802,500
2023-11-01$239.62$239.62841,700
2023-10-31$237.54$237.54681,400
2023-10-30$237.21$237.21857,200
2023-10-27$234.52$234.521,089,300
2023-10-26$241.08$241.081,364,700
2023-10-25$246.72$246.721,204,000
2023-10-24$252.11$252.11795,700
2023-10-23$253.39$253.39963,000
2023-10-20$257.45$257.451,938,400
2023-10-19$257.30$257.301,225,200
2023-10-18$263.50$263.50977,000
2023-10-17$267.43$267.43623,200
2023-10-16$267.94$267.941,227,100
2023-10-13$262.26$262.26869,800
2023-10-12$260.99$260.991,553,800
2023-10-11$266.52$266.52814,100
2023-10-10$264.14$264.14689,900
2023-10-09$264.21$264.21612,000
2023-10-06$263.25$263.251,080,100
2023-10-05$259.77$259.77814,200
2023-10-04$257.16$257.161,034,400
2023-10-03$251.31$251.31830,000
2023-10-02$252.86$252.86752,400
2023-09-29$257.01$257.01887,600
2023-09-28$257.83$257.83641,200
2023-09-27$257.52$257.52806,400
2023-09-26$258.05$258.05855,900
2023-09-25$255.02$255.02766,200
2023-09-22$257.68$257.68800,800
2023-09-21$258.93$258.93974,600
2023-09-20$260.53$260.531,143,100
2023-09-19$256.67$256.67567,000
2023-09-18$253.30$253.30509,800
2023-09-15$254.79$254.791,353,000
2023-09-14$256.32$256.32652,900
2023-09-13$255.91$255.91623,900
2023-09-12$258.44$258.44611,200
2023-09-11$258.92$258.92585,000
2023-09-08$258.99$258.99788,100
2023-09-07$261.34$261.341,199,200
2023-09-06$263.72$263.72944,700
2023-09-05$266.29$266.29932,500
2023-09-01$267.17$267.17522,400
2023-08-31$267.36$267.361,012,700
2023-08-30$267.18$267.18552,700
2023-08-29$268.00$268.00525,000
2023-08-28$265.05$265.05359,900
2023-08-25$264.43$264.43608,100
2023-08-24$262.43$262.43515,700
2023-08-23$264.80$264.80544,600
2023-08-22$262.98$262.98655,700
2023-08-21$265.07$265.07755,300
2023-08-18$261.15$261.15585,600
2023-08-17$261.50$261.50741,800
2023-08-16$265.26$265.26645,700
2023-08-15$270.22$270.22763,000
2023-08-14$272.74$272.74715,600
2023-08-11$273.68$273.68869,700
2023-08-10$269.06$269.06934,900
2023-08-09$271.29$271.29613,000
2023-08-08$274.14$274.141,445,200
2023-08-07$271.23$271.231,232,300
2023-08-04$268.92$268.92929,600
2023-08-03$267.75$267.75977,200
2023-08-02$271.56$271.561,299,500
2023-08-01$269.30$269.301,070,600
2023-07-31$270.19$270.191,374,500
2023-07-28$265.23$265.233,168,200
2023-07-27$262.79$262.791,283,200
2023-07-26$265.25$265.251,517,500
2023-07-25$270.31$270.312,485,300
2023-07-24$277.00$277.001,173,500
2023-07-21$276.74$276.742,827,800
2023-07-20$274.70$274.701,570,700
2023-07-19$276.89$276.89912,300
2023-07-18$276.17$276.171,052,200
2023-07-17$278.40$278.401,189,000
2023-07-14$278.93$278.93895,300
2023-07-13$277.97$277.97985,700
2023-07-12$277.62$277.621,055,700
2023-07-11$279.84$279.84909,300
2023-07-10$281.58$281.581,280,500
2023-07-07$275.07$275.072,851,400
2023-07-06$284.99$284.991,067,800
2023-07-05$285.89$285.89744,700
2023-07-03$285.44$285.44414,700
2023-06-30$284.85$284.851,130,800
2023-06-29$282.13$282.13873,700
2023-06-28$284.02$284.02618,700
2023-06-27$282.95$282.95851,000
2023-06-26$281.58$281.58833,500
2023-06-23$284.52$284.521,428,400
2023-06-22$293.95$293.95905,600
2023-06-21$294.36$294.36787,800
2023-06-20$293.79$293.79961,200
2023-06-16$297.48$297.481,915,400
2023-06-15$297.83$297.831,483,000
2023-06-14$299.99$299.991,512,500
2023-06-13$304.60$304.601,526,900
2023-06-12$313.41$313.411,502,500
2023-06-09$308.88$308.888,100
2023-06-08$308.88$308.881,231,600
2023-06-07$304.90$304.902,034,300
2023-06-06$299.79$299.79911,700
2023-06-05$302.13$302.131,085,200
2023-06-02$300.20$300.20817,100
2023-06-01$302.41$302.411,033,600
2023-05-31$296.41$296.411,566,900
2023-05-30$298.69$298.69802,600
2023-05-26$298.66$298.66945,500
2023-05-25$297.13$297.131,073,000
2023-05-24$301.56$301.56842,700
2023-05-23$303.15$303.15762,700
2023-05-22$306.87$306.87528,000
2023-05-19$308.48$308.48568,800
2023-05-18$305.45$305.45616,800
2023-05-17$306.25$306.25585,400
2023-05-16$307.61$307.61638,400
2023-05-15$311.87$311.87495,800
2023-05-12$309.60$309.60442,600
2023-05-11$310.56$310.56726,300
2023-05-10$313.26$313.26795,100
2023-05-09$314.00$314.00906,100
2023-05-08$314.37$314.37936,100
2023-05-05$318.06$318.061,734,700
2023-05-04$313.57$313.571,214,000
2023-05-03$311.00$311.002,787,500
2023-05-02$309.28$309.281,090,900
2023-05-01$311.11$311.111,278,900
2023-04-28$304.23$304.231,957,700
2023-04-27$293.72$293.721,459,500
2023-04-26$288.04$288.041,817,400
2023-04-25$282.41$282.411,527,900
2023-04-24$293.03$293.031,138,100
2023-04-21$293.99$293.99847,800
2023-04-20$290.27$290.27653,500
2023-04-19$292.27$292.27492,400
2023-04-18$293.83$293.83668,900
2023-04-17$292.20$292.20764,900
2023-04-14$288.13$288.13571,400
2023-04-13$289.70$289.70715,500
2023-04-12$285.79$285.79611,200
2023-04-11$283.69$283.69556,100
2023-04-10$282.86$282.86475,800
2023-04-06$286.80$286.80737,100
2023-04-05$283.99$283.991,008,200
2023-04-04$275.25$275.25579,200
2023-04-03$277.34$277.34772,800
2023-03-31$278.03$278.031,197,000
2023-03-30$275.13$275.13714,000
2023-03-29$274.01$274.01772,900
2023-03-28$270.25$270.25560,300
2023-03-27$269.98$269.98607,800
2023-03-24$270.03$270.03973,400
2023-03-23$265.17$265.17703,700
2023-03-22$261.22$261.22530,500
2023-03-21$266.15$266.15621,300
2023-03-20$267.91$267.91878,400
2023-03-17$263.16$263.161,602,200
2023-03-16$265.25$265.251,010,600
2023-03-15$262.37$262.37735,500
2023-03-14$262.35$262.351,110,700
2023-03-13$258.55$258.551,027,300
2023-03-10$256.56$256.56880,700
2023-03-09$258.99$258.99884,000
2023-03-08$263.02$263.02649,600
2023-03-07$264.88$264.88640,900
2023-03-06$270.25$270.251,116,500
2023-03-03$270.27$270.27842,000
2023-03-02$268.75$268.75732,100
2023-03-01$272.21$272.211,167,600
2023-02-28$269.86$269.861,083,500
2023-02-27$269.20$269.20822,200
2023-02-24$270.02$270.02904,500
2023-02-23$271.95$271.95863,200
2023-02-22$272.55$272.55760,700
2023-02-21$271.93$271.931,023,400
2023-02-17$278.38$278.38782,900
2023-02-16$271.53$271.531,511,000
2023-02-15$278.98$278.981,590,300
2023-02-14$289.08$289.081,049,200
2023-02-13$290.46$290.46761,800
2023-02-10$286.30$286.30724,700
2023-02-09$287.00$287.00857,300
2023-02-08$285.45$285.45678,700
2023-02-07$291.43$291.43802,800
2023-02-06$288.28$288.28782,700
2023-02-03$283.63$283.63789,100
2023-02-02$287.52$287.52982,800
2023-02-01$291.60$291.60755,300
2023-01-31$290.90$290.90851,900
2023-01-30$285.94$285.94619,000
2023-01-27$290.08$290.08894,200
2023-01-26$291.92$291.92557,800
2023-01-25$292.34$292.34707,400
2023-01-24$291.88$291.88911,000
2023-01-23$291.93$291.931,553,000
2023-01-20$285.77$285.771,101,500
2023-01-19$280.13$280.13623,100
2023-01-18$283.47$283.471,322,300
2023-01-17$289.59$289.591,167,200
2023-01-13$288.04$288.041,008,000
2023-01-12$288.08$288.081,218,000
2023-01-11$285.03$285.031,386,200
2023-01-10$281.46$281.461,379,200
2023-01-09$274.72$274.721,715,700
2023-01-06$279.25$279.253,729,300
2023-01-05$271.59$271.591,195,300
2023-01-04$270.81$270.811,089,100
2023-01-03$272.63$272.631,090,300