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 — 2012

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2012-12-31$146.37$146.37927,900——
2012-12-28$146.05$146.05716,300——
2012-12-27$147.76$147.761,072,700——
2012-12-26$148.43$148.43507,800——
2012-12-24$149.07$149.07358,000——
2012-12-21$149.91$149.911,992,300——
2012-12-20$151.21$151.21729,700——
2012-12-19$151.31$151.311,275,500——
2012-12-18$153.42$153.42818,300——
2012-12-17$152.65$152.65815,200——
2012-12-14$151.25$151.25730,700——
2012-12-13$151.56$151.56672,200——
2012-12-12$152.35$152.35873,100——
2012-12-11$154.22$154.221,252,700——
2012-12-10$153.14$153.14731,100——
2012-12-07$151.29$151.29765,000——
2012-12-06$151.73$151.73610,000——
2012-12-05$150.55$150.55736,800——
2012-12-04$151.86$151.861,237,700——
2012-12-03$150.55$150.55851,000——
2012-11-30$149.09$149.09895,600——
2012-11-29$150.30$150.30740,500——
2012-11-28$149.46$149.46652,800——
2012-11-27$147.88$147.88696,300——
2012-11-26$149.11$149.11853,100——
2012-11-23$149.87$149.87374,100——
2012-11-21$147.36$147.361,409,000——
2012-11-20$148.15$148.151,753,000——
2012-11-19$143.53$143.531,433,500——
2012-11-16$141.24$141.242,349,100——
2012-11-15$137.93$137.931,312,400——
2012-11-14$136.30$136.301,098,200——
2012-11-13$138.02$138.021,170,800——
2012-11-12$139.48$139.481,132,200——
2012-11-09$138.05$138.051,377,500——
2012-11-08$135.61$135.611,522,200——
2012-11-07$138.35$138.351,037,600——
2012-11-06$140.30$140.30990,300——
2012-11-05$139.60$139.60744,500——
2012-11-02$138.41$138.411,325,200——
2012-11-01$139.03$139.031,165,300——
2012-10-31$138.21$138.211,829,800——
2012-10-26$142.93$142.93991,600——
2012-10-25$144.43$144.431,381,400——
2012-10-24$142.06$142.061,655,200——
2012-10-23$142.06$142.061,055,200——
2012-10-22$145.30$145.301,050,700——
2012-10-19$145.65$145.652,151,700——
2012-10-18$149.56$149.562,018,400——
2012-10-17$153.78$153.78813,400——
2012-10-16$153.25$153.25973,000——
2012-10-15$149.41$149.41992,900——
2012-10-12$147.20$147.201,084,400——
2012-10-11$147.10$147.101,023,100——
2012-10-10$147.29$147.29870,800——
2012-10-09$149.38$149.38858,100——
2012-10-08$151.22$151.22566,300——
2012-10-05$152.53$152.53965,700——
2012-10-04$152.57$152.57995,800——
2012-10-03$152.94$152.941,056,800——
2012-10-02$149.93$149.93773,800——
2012-10-01$149.94$149.941,089,200——
2012-09-28$149.21$149.211,322,400——
2012-09-27$150.71$150.711,743,800——
2012-09-26$151.62$151.621,785,500——
2012-09-25$152.83$152.83956,300——
2012-09-24$154.40$154.40832,600——
2012-09-21$154.57$154.571,690,900——
2012-09-20$156.06$156.061,174,500——
2012-09-19$155.04$155.041,068,600——
2012-09-18$155.80$155.801,075,700——
2012-09-17$154.41$154.411,598,000——
2012-09-14$154.24$154.241,269,400——
2012-09-13$152.50$152.50927,000——
2012-09-12$152.26$152.26602,200——
2012-09-11$151.95$151.95576,600——
2012-09-10$151.60$151.60593,500——
2012-09-07$152.50$152.50666,200——
2012-09-06$152.19$152.191,187,500——
2012-09-05$146.67$146.67626,200——
2012-09-04$147.07$147.07783,100——
2012-08-31$146.59$146.59633,600——
2012-08-30$145.95$145.95588,500——
2012-08-29$145.89$145.89689,500——
2012-08-28$146.43$146.43614,700——
2012-08-27$147.39$147.39680,500——
2012-08-24$147.03$147.03606,900——
2012-08-23$145.15$145.15519,600——
2012-08-22$144.92$144.92799,200——
2012-08-21$143.97$143.97924,400——
2012-08-20$144.69$144.69694,300——
2012-08-17$145.09$145.09902,000——
2012-08-16$146.84$146.84465,300——
2012-08-15$146.87$146.87517,900——
2012-08-14$145.50$145.50512,700——
2012-08-13$144.54$144.54593,900——
2012-08-10$145.51$145.51880,200——
2012-08-09$143.09$143.091,209,800——
2012-08-08$145.05$145.05709,000——
2012-08-07$146.18$146.18667,600——
2012-08-06$145.46$145.46704,900——
2012-08-03$145.06$145.061,002,800——
2012-08-02$143.80$143.801,115,600——
2012-08-01$144.28$144.28962,200——
2012-07-31$145.83$145.83920,500——
2012-07-30$147.28$147.28864,600——
2012-07-27$149.47$149.471,422,300——
2012-07-26$147.75$147.751,430,000——
2012-07-25$143.45$143.451,440,100——
2012-07-24$139.48$139.481,313,300——
2012-07-23$139.23$139.231,128,500——
2012-07-20$142.21$142.211,168,500——
2012-07-19$143.74$143.74881,800——
2012-07-18$144.96$144.96747,900——
2012-07-17$145.91$145.91823,500——
2012-07-16$145.22$145.22630,800——
2012-07-13$144.61$144.61733,400——
2012-07-12$142.63$142.631,345,200——
2012-07-11$142.00$142.001,060,100——
2012-07-10$143.75$143.751,151,000——
2012-07-09$143.16$143.161,135,300——
2012-07-06$142.46$142.46831,400——
2012-07-05$144.12$144.12781,000——
2012-07-03$145.63$145.63548,100——
2012-07-02$145.61$145.611,202,700——
2012-06-29$144.38$144.381,490,300——
2012-06-28$140.11$140.111,119,600——
2012-06-27$143.16$143.16807,700——
2012-06-26$141.97$141.97862,900——
2012-06-25$142.03$142.03900,900——
2012-06-22$141.74$141.741,050,700——
2012-06-21$139.20$139.201,368,700——
2012-06-20$142.85$142.851,533,900——
2012-06-19$143.09$143.091,190,200——
2012-06-18$141.96$141.961,846,500——
2012-06-15$140.01$140.011,904,300——
2012-06-14$138.66$138.661,597,300——
2012-06-13$134.22$134.221,189,900——
2012-06-12$134.15$134.151,210,500——
2012-06-11$132.26$132.261,456,200——
2012-06-08$133.52$133.52919,900——
2012-06-07$133.34$133.341,262,000——
2012-06-06$134.11$134.111,061,700——
2012-06-05$132.43$132.431,579,800——
2012-06-04$130.79$130.791,510,000——
2012-06-01$126.73$126.731,335,900——
2012-05-31$130.75$130.751,449,100——
2012-05-30$130.84$130.841,272,200——
2012-05-29$131.54$131.541,345,800——
2012-05-25$131.56$131.56757,200——
2012-05-24$131.65$131.651,069,600——
2012-05-23$131.50$131.501,500,000——
2012-05-22$132.33$132.331,344,000——
2012-05-21$132.26$132.261,479,600——
2012-05-18$131.58$131.581,838,700——
2012-05-17$132.88$132.881,519,600——
2012-05-16$136.80$136.801,394,200——
2012-05-15$137.04$137.041,251,400——
2012-05-14$136.87$136.87934,300——
2012-05-11$136.71$136.711,189,000——
2012-05-10$134.31$134.31881,000——
2012-05-09$132.51$132.511,416,000——
2012-05-08$132.93$132.931,273,900——
2012-05-07$132.51$132.511,108,200——
2012-05-04$130.97$130.971,070,200——
2012-05-03$134.26$134.261,270,200——
2012-05-02$135.16$135.161,515,300——
2012-05-01$131.83$131.832,154,300——
2012-04-30$134.01$134.011,947,400——
2012-04-27$133.16$133.161,322,700——
2012-04-26$130.80$130.801,019,000——
2012-04-25$129.29$129.291,151,200——
2012-04-24$127.74$127.741,317,700——
2012-04-23$125.85$125.85626,000——
2012-04-20$127.23$127.231,279,500——
2012-04-19$125.95$125.95978,700——
2012-04-18$126.54$126.54900,700——
2012-04-17$128.42$128.421,313,100——
2012-04-16$125.78$125.781,106,200——
2012-04-13$125.34$125.34825,800——
2012-04-12$125.50$125.50907,400——
2012-04-11$125.03$125.031,793,000——
2012-04-10$125.02$125.021,087,000——
2012-04-09$126.61$126.61700,000——
2012-04-05$128.62$128.62862,100——
2012-04-04$127.82$127.821,520,700——
2012-04-03$128.80$128.80911,200——
2012-04-02$127.63$127.63854,400——
2012-03-30$126.00$126.001,338,600——
2012-03-29$126.48$126.48946,800——
2012-03-28$125.69$125.691,282,300——
2012-03-27$126.23$126.231,897,700——
2012-03-26$125.80$125.801,727,200——
2012-03-23$120.96$120.96626,100——
2012-03-22$120.71$120.71711,500——
2012-03-21$119.94$119.941,152,200——
2012-03-20$119.28$119.28953,900——
2012-03-19$119.97$119.97732,800——
2012-03-16$120.04$120.042,196,700——
2012-03-15$121.05$121.051,095,500——
2012-03-14$120.73$120.731,202,400——
2012-03-13$122.18$122.181,232,000——
2012-03-12$120.53$120.53866,500——
2012-03-09$120.61$120.611,330,900——
2012-03-08$120.42$120.421,782,200——
2012-03-07$117.00$117.00728,500——
2012-03-06$117.03$117.03793,000——
2012-03-05$118.42$118.421,198,300——
2012-03-02$118.89$118.89997,100——
2012-03-01$118.71$118.711,236,400——
2012-02-29$116.47$116.471,572,000——
2012-02-28$116.68$116.681,326,300——
2012-02-27$116.40$116.40836,800——
2012-02-24$116.39$116.39964,800——
2012-02-23$116.70$116.70836,900——
2012-02-22$116.51$116.51955,600——
2012-02-21$115.67$115.671,556,800——
2012-02-17$116.45$116.451,889,900——
2012-02-16$119.17$119.17934,200——
2012-02-15$118.49$118.49985,800——
2012-02-14$119.70$119.701,029,400——
2012-02-13$120.00$120.001,802,100——
2012-02-10$118.14$118.141,043,300——
2012-02-09$117.78$117.782,101,200——
2012-02-08$119.60$119.601,700,300——
2012-02-07$121.56$121.561,215,800——
2012-02-06$122.09$122.091,263,300——
2012-02-03$121.88$121.881,198,500——
2012-02-02$121.26$121.261,512,300——
2012-02-01$121.26$121.263,018,200——
2012-01-31$117.95$117.952,615,600——
2012-01-30$116.58$116.582,297,300——
2012-01-27$118.56$118.561,551,600——
2012-01-26$117.85$117.851,651,700——
2012-01-25$118.35$118.351,847,200——
2012-01-24$117.03$117.031,900,200——
2012-01-23$116.31$116.311,690,600——
2012-01-20$118.14$118.143,396,400——
2012-01-19$116.78$116.781,694,500——
2012-01-18$117.15$117.151,813,900——
2012-01-17$116.90$116.901,666,000——
2012-01-13$116.03$116.031,404,800——
2012-01-12$116.30$116.301,817,100——
2012-01-11$115.71$115.712,587,100——
2012-01-10$114.88$114.881,458,600——
2012-01-09$114.87$114.871,530,300——
2012-01-06$115.50$115.501,763,300——
2012-01-05$115.26$115.262,312,300——
2012-01-04$113.72$113.721,417,800——
2012-01-03$113.50$113.501,990,800——