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 — 2024

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2024-12-31$152.92$152.921,148,400
2024-12-30$150.19$150.191,163,700
2024-12-27$151.31$151.311,128,500
2024-12-26$149.90$149.90846,000
2024-12-24$149.02$149.02524,900
2024-12-23$149.38$149.381,534,900
2024-12-20$146.47$146.475,776,200
2024-12-19$147.39$147.391,650,000
2024-12-18$146.79$146.791,495,700
2024-12-17$150.64$150.641,377,800
2024-12-16$150.49$150.491,897,100
2024-12-13$150.03$150.031,608,400
2024-12-12$155.33$155.331,050,600
2024-12-11$157.46$157.461,395,300
2024-12-10$156.32$156.321,863,000
2024-12-09$156.46$156.461,483,400
2024-12-06$157.78$157.78947,400
2024-12-05$159.26$159.261,037,300
2024-12-04$160.92$160.921,157,300
2024-12-03$160.85$160.851,210,800
2024-12-02$164.23$164.231,663,600
2024-11-29$160.63$160.631,109,600
2024-11-27$159.83$159.831,325,100
2024-11-26$157.69$157.691,418,000
2024-11-25$158.71$158.712,091,400
2024-11-22$157.90$157.901,703,700
2024-11-21$158.01$158.011,885,800
2024-11-20$156.00$156.001,630,700
2024-11-19$155.43$155.431,296,700
2024-11-18$157.94$157.941,633,000
2024-11-15$159.99$159.991,916,700
2024-11-14$164.89$164.893,210,600
2024-11-13$165.79$165.791,394,700
2024-11-12$168.28$168.281,406,300
2024-11-11$172.03$172.031,458,100
2024-11-08$173.04$173.041,581,700
2024-11-07$173.92$173.921,438,300
2024-11-06$174.40$174.401,827,700
2024-11-05$176.93$176.932,472,200
2024-11-04$173.52$173.522,494,800
2024-11-01$173.79$173.791,456,000
2024-10-31$174.00$174.001,755,600
2024-10-30$181.18$181.181,632,900
2024-10-29$183.47$183.471,342,700
2024-10-28$185.01$185.011,893,400
2024-10-25$181.69$181.691,720,100
2024-10-24$183.86$183.861,057,200
2024-10-23$182.98$182.98977,700
2024-10-22$185.90$185.90830,800
2024-10-21$184.65$184.651,252,500
2024-10-18$190.16$190.16928,100
2024-10-17$189.55$189.55728,900
2024-10-16$189.00$189.00985,000
2024-10-15$191.55$191.551,429,200
2024-10-14$191.56$191.561,274,000
2024-10-11$188.38$188.381,429,500
2024-10-10$188.59$188.591,323,400
2024-10-09$185.76$185.761,160,900
2024-10-08$182.30$182.301,207,700
2024-10-07$183.34$183.34983,400
2024-10-04$185.68$185.681,137,200
2024-10-03$184.78$184.782,037,000
2024-10-02$188.74$188.741,472,500
2024-10-01$190.80$190.802,236,300
2024-09-30$193.84$193.84989,700
2024-09-27$194.67$194.67709,800
2024-09-26$193.60$193.60818,300
2024-09-25$189.07$189.071,543,800
2024-09-24$194.12$194.121,188,000
2024-09-23$195.81$195.811,325,400
2024-09-20$199.36$199.363,833,500
2024-09-19$201.44$201.441,125,400
2024-09-18$197.59$197.59670,700
2024-09-17$198.21$198.21923,900
2024-09-16$199.58$199.581,034,500
2024-09-13$195.63$195.631,090,800
2024-09-12$197.89$197.89852,100
2024-09-11$199.09$199.09795,200
2024-09-10$200.64$200.64557,400
2024-09-09$199.27$199.27883,300
2024-09-06$200.81$200.81834,800
2024-09-05$201.80$201.801,127,600
2024-09-04$204.95$204.95785,200
2024-09-03$204.84$204.84892,100
2024-08-30$204.76$204.76879,000
2024-08-29$204.82$204.82520,200
2024-08-28$204.20$204.20637,500
2024-08-27$203.30$203.30565,400
2024-08-26$204.86$204.86478,200
2024-08-23$205.00$205.001,127,300
2024-08-22$203.32$203.32791,500
2024-08-21$206.18$206.18601,400
2024-08-20$205.49$205.49625,900
2024-08-19$206.06$206.06793,300
2024-08-16$201.91$201.91706,000
2024-08-15$201.63$201.63690,400
2024-08-14$200.59$200.59508,800
2024-08-13$204.05$204.05838,600
2024-08-12$201.04$201.04821,100
2024-08-09$202.00$202.00586,800
2024-08-08$204.07$204.071,198,500
2024-08-07$199.78$199.78971,300
2024-08-06$200.13$200.131,262,100
2024-08-05$198.39$198.391,394,300
2024-08-02$205.66$205.661,768,700
2024-08-01$210.70$210.701,892,000
2024-07-31$213.20$213.201,831,600
2024-07-30$211.89$211.891,286,700
2024-07-29$214.43$214.431,538,100
2024-07-26$211.17$211.172,255,900
2024-07-25$227.44$227.441,139,000
2024-07-24$226.03$226.03908,400
2024-07-23$224.29$224.29854,800
2024-07-22$226.63$226.63692,400
2024-07-19$226.40$226.40851,800
2024-07-18$225.25$225.25856,200
2024-07-17$228.33$228.33949,500
2024-07-16$225.02$225.021,006,200
2024-07-15$221.58$221.581,381,800
2024-07-12$230.06$230.061,473,200
2024-07-11$236.80$236.80667,100
2024-07-10$232.75$232.75522,600
2024-07-09$229.06$229.06518,800
2024-07-08$228.07$228.07535,600
2024-07-05$225.65$225.65458,300
2024-07-03$224.61$224.61580,700
2024-07-02$228.82$228.82860,200
2024-07-01$231.77$231.77862,700
2024-06-28$231.82$231.822,242,800
2024-06-27$228.72$228.721,005,400
2024-06-26$224.46$224.46861,300
2024-06-25$223.19$223.19802,400
2024-06-24$226.60$226.601,000,300
2024-06-21$224.00$224.003,012,500
2024-06-20$225.58$225.58676,200
2024-06-18$223.65$223.65757,000
2024-06-17$226.46$226.46993,500
2024-06-14$231.69$231.69747,900
2024-06-13$233.84$233.84994,300
2024-06-12$230.63$230.631,036,700
2024-06-11$225.74$225.74937,300
2024-06-10$225.98$225.98918,400
2024-06-07$225.43$225.43958,600
2024-06-06$231.99$231.99887,200
2024-06-05$236.72$236.72947,800
2024-06-04$234.13$234.131,016,700
2024-06-03$229.80$229.801,220,700
2024-05-31$224.94$224.941,872,400
2024-05-30$220.07$220.07939,900
2024-05-29$214.41$214.41980,400
2024-05-28$218.73$218.73633,200
2024-05-24$217.81$217.81770,900
2024-05-23$218.06$218.061,068,700
2024-05-22$225.21$225.211,225,700
2024-05-21$227.69$227.69761,200
2024-05-20$231.58$231.58719,100
2024-05-17$230.57$230.57985,100
2024-05-16$230.04$230.04936,600
2024-05-15$235.32$235.321,792,600
2024-05-14$226.88$226.881,126,900
2024-05-13$225.34$225.341,274,600
2024-05-10$221.50$221.50655,200
2024-05-09$222.75$222.75754,500
2024-05-08$219.72$219.72758,500
2024-05-07$218.92$218.921,156,400
2024-05-06$221.42$221.421,199,700
2024-05-03$217.51$217.511,144,100
2024-05-02$213.51$213.51877,700
2024-05-01$216.13$216.13916,300
2024-04-30$214.82$214.821,225,600
2024-04-29$215.50$215.502,068,000
2024-04-26$208.90$208.901,894,100
2024-04-25$202.46$202.461,590,100
2024-04-24$201.99$201.993,265,700
2024-04-23$193.18$193.181,461,700
2024-04-22$194.11$194.111,119,500
2024-04-19$194.38$194.381,599,600
2024-04-18$190.52$190.521,512,000
2024-04-17$192.16$192.161,320,600
2024-04-16$195.15$195.15871,900
2024-04-15$196.80$196.801,159,200
2024-04-12$198.18$198.181,245,900
2024-04-11$203.68$203.681,019,100
2024-04-10$201.55$201.55900,900
2024-04-09$206.52$206.52969,000
2024-04-08$204.95$204.95723,700
2024-04-05$203.87$203.87954,500
2024-04-04$205.30$205.30776,400
2024-04-03$206.38$206.38904,500
2024-04-02$207.64$207.641,462,800
2024-04-01$214.83$214.83850,300
2024-03-28$215.63$215.631,912,200
2024-03-27$216.34$216.341,250,000
2024-03-26$212.02$212.021,589,800
2024-03-25$216.69$216.69725,900
2024-03-22$218.10$218.101,070,900
2024-03-21$220.75$220.751,001,100
2024-03-20$218.15$218.15945,000
2024-03-19$218.63$218.631,518,800
2024-03-18$219.40$219.401,356,500
2024-03-15$219.31$219.312,407,100
2024-03-14$219.62$219.621,611,500
2024-03-13$226.56$226.561,481,100
2024-03-12$227.36$227.361,068,900
2024-03-11$230.07$230.071,218,200
2024-03-08$223.24$223.241,657,800
2024-03-07$219.36$219.361,150,300
2024-03-06$217.56$217.561,441,400
2024-03-05$217.23$217.23890,400
2024-03-04$221.02$221.021,083,600
2024-03-01$220.95$220.951,085,400
2024-02-29$216.99$216.991,917,800
2024-02-28$221.74$221.741,038,400
2024-02-27$223.94$223.94983,100
2024-02-26$223.71$223.71774,500
2024-02-23$223.32$223.32911,000
2024-02-22$222.48$222.48901,100
2024-02-21$221.11$221.111,055,000
2024-02-20$219.21$219.211,919,600
2024-02-16$219.08$219.081,768,100
2024-02-15$223.35$223.351,307,700
2024-02-14$220.74$220.742,220,600
2024-02-13$226.65$226.653,403,600
2024-02-12$244.74$244.74962,000
2024-02-09$240.98$240.98689,900
2024-02-08$240.30$240.30743,700
2024-02-07$240.54$240.54773,800
2024-02-06$245.55$245.551,304,800
2024-02-05$241.84$241.84858,600
2024-02-02$243.72$243.72861,400
2024-02-01$247.83$247.83955,500
2024-01-31$246.66$246.661,119,900
2024-01-30$247.08$247.08815,600
2024-01-29$247.52$247.52681,400
2024-01-26$244.82$244.82540,800
2024-01-25$246.21$246.21695,900
2024-01-24$247.16$247.16855,100
2024-01-23$251.68$251.68728,000
2024-01-22$248.30$248.30787,200
2024-01-19$249.96$249.962,316,700
2024-01-18$246.97$246.971,172,000
2024-01-17$245.27$245.27773,100
2024-01-16$246.19$246.191,055,800
2024-01-12$248.12$248.12769,600
2024-01-11$247.21$247.211,196,600
2024-01-10$254.23$254.23792,900
2024-01-09$255.84$255.84807,700
2024-01-08$257.98$257.981,419,700
2024-01-05$257.88$257.88849,600
2024-01-04$260.28$260.28949,000
2024-01-03$263.43$263.43814,300
2024-01-02$267.71$267.711,084,700