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 — 2011

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2011-12-30$110.05$110.05938,200——
2011-12-29$110.64$110.641,100,500——
2011-12-28$110.20$110.20844,900——
2011-12-27$111.32$111.32772,200——
2011-12-23$110.79$110.79736,200——
2011-12-22$110.69$110.69876,500——
2011-12-21$111.49$111.492,061,700——
2011-12-20$110.73$110.732,222,000——
2011-12-19$109.99$109.991,516,300——
2011-12-16$110.29$110.291,910,100——
2011-12-15$109.73$109.731,321,800——
2011-12-14$109.63$109.631,498,200——
2011-12-13$110.09$110.091,186,900——
2011-12-12$110.39$110.391,007,900——
2011-12-09$112.95$112.951,343,400——
2011-12-08$109.71$109.71855,800——
2011-12-07$111.76$111.761,004,200——
2011-12-06$112.14$112.14940,200——
2011-12-05$111.79$111.791,554,700——
2011-12-02$113.24$113.241,704,800——
2011-12-01$116.48$116.481,326,500——
2011-11-30$114.95$114.951,879,300——
2011-11-29$110.41$110.411,583,600——
2011-11-28$111.05$111.051,788,500——
2011-11-25$109.20$109.20864,800——
2011-11-23$109.93$109.931,995,700——
2011-11-22$113.50$113.502,597,500——
2011-11-21$107.89$107.891,653,700——
2011-11-18$107.65$107.651,889,800——
2011-11-17$109.63$109.631,680,200——
2011-11-16$110.29$110.291,480,200——
2011-11-15$113.07$113.071,309,100——
2011-11-14$113.94$113.941,295,400——
2011-11-11$113.38$113.381,122,000——
2011-11-10$112.08$112.081,587,400——
2011-11-09$111.24$111.241,751,600——
2011-11-08$113.92$113.921,158,700——
2011-11-07$114.01$114.011,266,100——
2011-11-04$113.49$113.491,591,200——
2011-11-03$114.05$114.052,775,500——
2011-11-02$113.43$113.432,341,600——
2011-11-01$113.96$113.962,724,500——
2011-10-31$116.36$116.363,357,900——
2011-10-28$118.72$118.722,143,300——
2011-10-27$117.74$117.743,483,400——
2011-10-26$116.92$116.925,169,800——
2011-10-25$106.87$106.872,103,700——
2011-10-24$109.52$109.522,287,800——
2011-10-21$108.84$108.844,402,500——
2011-10-20$101.67$101.671,608,300——
2011-10-19$102.08$102.081,646,300——
2011-10-18$102.64$102.641,345,400——
2011-10-17$101.43$101.431,230,600——
2011-10-14$103.08$103.082,081,400——
2011-10-13$101.32$101.322,194,800——
2011-10-12$98.76$98.761,916,200——
2011-10-11$98.92$98.921,306,200——
2011-10-10$100.68$100.681,576,700——
2011-10-07$100.01$100.012,051,000——
2011-10-06$99.41$99.413,047,200——
2011-10-05$98.71$98.713,880,800——
2011-10-04$91.66$91.662,309,300——
2011-10-03$88.96$88.962,133,800——
2011-09-30$93.15$93.151,498,300——
2011-09-29$94.46$94.461,692,200——
2011-09-28$95.04$95.041,048,200——
2011-09-27$96.67$96.671,641,500——
2011-09-26$95.73$95.731,767,000——
2011-09-23$93.90$93.901,392,600——
2011-09-22$94.54$94.541,883,000——
2011-09-21$96.96$96.961,586,100——
2011-09-20$100.26$100.261,462,900——
2011-09-19$99.48$99.481,853,100——
2011-09-16$100.89$100.893,524,400——
2011-09-15$99.40$99.402,136,800——
2011-09-14$97.84$97.843,210,600——
2011-09-13$94.52$94.522,427,000——
2011-09-12$91.99$91.991,838,800——
2011-09-09$90.24$90.242,015,900——
2011-09-08$91.55$91.552,221,000——
2011-09-07$93.00$93.001,835,700——
2011-09-06$91.91$91.911,733,700——
2011-09-02$91.58$91.58975,800——
2011-09-01$93.61$93.611,205,400——
2011-08-31$94.20$94.201,572,000——
2011-08-30$93.60$93.601,309,600——
2011-08-29$93.89$93.891,468,100——
2011-08-26$92.29$92.291,493,400——
2011-08-25$90.67$90.671,557,800——
2011-08-24$92.05$92.051,712,900——
2011-08-23$91.24$91.242,669,200——
2011-08-22$89.41$89.411,813,100——
2011-08-19$90.05$90.053,529,900——
2011-08-18$88.46$88.462,353,800——
2011-08-17$90.03$90.031,943,100——
2011-08-16$91.10$91.101,576,500——
2011-08-15$91.67$91.671,838,100——
2011-08-12$90.98$90.982,530,500——
2011-08-11$88.41$88.412,332,300——
2011-08-10$85.03$85.032,722,500——
2011-08-09$89.43$89.433,684,600——
2011-08-08$88.00$88.003,713,800——
2011-08-05$93.18$93.182,767,200——
2011-08-04$92.55$92.552,959,600——
2011-08-03$98.78$98.782,431,200——
2011-08-02$99.67$99.672,795,000——
2011-08-01$102.90$102.902,898,800——
2011-07-29$101.87$101.871,745,300——
2011-07-28$102.15$102.151,335,900——
2011-07-27$101.81$101.812,525,300——
2011-07-26$105.00$105.002,369,500——
2011-07-25$103.99$103.992,932,300——
2011-07-22$105.56$105.561,145,700——
2011-07-21$105.62$105.621,267,200——
2011-07-20$104.37$104.371,411,400——
2011-07-19$107.21$107.211,550,800——
2011-07-18$103.75$103.751,367,900——
2011-07-15$104.00$104.001,589,900——
2011-07-14$103.19$103.191,318,000——
2011-07-13$105.31$105.311,524,600——
2011-07-12$104.05$104.051,583,400——
2011-07-11$105.43$105.431,270,200——
2011-07-08$107.39$107.391,726,600——
2011-07-07$106.52$106.521,889,900——
2011-07-06$107.89$107.891,492,500——
2011-07-05$107.91$107.911,337,800——
2011-07-01$108.50$108.501,707,400——
2011-06-30$106.92$106.921,938,900——
2011-06-29$108.98$108.983,775,900——
2011-06-28$108.39$108.393,148,200——
2011-06-27$104.65$104.653,247,500——
2011-06-24$103.42$103.428,324,400——
2011-06-23$100.67$100.673,107,500——
2011-06-22$99.47$99.475,334,200——
2011-06-21$98.65$98.655,583,900——
2011-06-20$98.60$98.603,620,400——
2011-06-17$94.75$94.753,107,000——
2011-06-16$93.53$93.531,274,600——
2011-06-15$93.76$93.762,060,600——
2011-06-14$94.88$94.882,444,700——
2011-06-13$91.78$91.781,047,000——
2011-06-10$91.21$91.211,742,500——
2011-06-09$93.72$93.721,115,700——
2011-06-08$92.80$92.801,132,200——
2011-06-07$93.30$93.301,004,400——
2011-06-06$93.16$93.161,283,800——
2011-06-03$94.40$94.401,366,900——
2011-06-02$95.17$95.171,735,000——
2011-06-01$93.18$93.182,317,900——
2011-05-31$94.73$94.732,377,700——
2011-05-27$93.21$93.211,197,400——
2011-05-26$93.28$93.281,834,300——
2011-05-25$93.67$93.671,531,200——
2011-05-24$94.85$94.851,328,000——
2011-05-23$95.31$95.311,500,000——
2011-05-20$97.11$97.112,741,300——
2011-05-19$96.72$96.721,506,400——
2011-05-18$97.76$97.761,690,700——
2011-05-17$97.57$97.571,978,100——
2011-05-16$96.14$96.142,492,900——
2011-05-13$96.61$96.611,484,600——
2011-05-12$98.24$98.241,800,000——
2011-05-11$96.59$96.591,600,000——
2011-05-10$97.34$97.341,765,900——
2011-05-09$98.10$98.101,766,000——
2011-05-06$96.12$96.122,254,300——
2011-05-05$95.47$95.471,900,000——
2011-05-04$96.48$96.482,619,600——
2011-05-03$97.99$97.991,802,800——
2011-05-02$98.67$98.672,665,800——
2011-04-29$97.65$97.654,231,500——
2011-04-28$98.97$98.973,400,000——
2011-04-27$99.49$99.493,937,300——
2011-04-26$101.80$101.805,200,000——
2011-04-25$100.28$100.285,867,200——
2011-04-21$99.70$99.7016,442,600——
2011-04-20$86.57$86.572,784,400——
2011-04-19$83.99$83.991,945,900——
2011-04-18$82.61$82.612,179,200——
2011-04-15$82.96$82.962,312,700——
2011-04-14$82.19$82.192,958,800——
2011-04-13$80.96$80.963,985,900——
2011-04-12$78.19$78.192,744,300——
2011-04-11$78.55$78.556,893,400——
2011-04-08$73.29$73.291,428,900——
2011-04-07$73.03$73.031,589,600——
2011-04-06$73.60$73.601,353,400——
2011-04-05$73.25$73.251,481,600——
2011-04-04$73.27$73.271,083,200——
2011-04-01$72.96$72.961,923,300——
2011-03-31$73.47$73.472,508,600——
2011-03-30$71.90$71.902,167,100——
2011-03-29$71.10$71.101,393,000——
2011-03-28$70.54$70.541,243,800——
2011-03-25$71.20$71.201,482,000——
2011-03-24$71.27$71.271,349,900——
2011-03-23$70.07$70.071,458,200——
2011-03-22$69.76$69.761,794,200——
2011-03-21$69.61$69.611,506,200——
2011-03-18$69.53$69.532,608,800——
2011-03-17$69.25$69.251,164,500——
2011-03-16$68.70$68.702,325,100——
2011-03-15$69.56$69.561,608,500——
2011-03-14$70.65$70.651,546,500——
2011-03-11$71.00$71.001,321,400——
2011-03-10$70.60$70.601,632,000——
2011-03-09$71.74$71.741,031,900——
2011-03-08$71.60$71.601,688,400——
2011-03-07$71.24$71.241,999,200——
2011-03-04$71.15$71.151,387,400——
2011-03-03$71.42$71.421,815,500——
2011-03-02$70.00$70.001,938,700——
2011-03-01$70.18$70.183,840,800——
2011-02-28$68.40$68.402,027,000——
2011-02-25$67.78$67.781,394,800——
2011-02-24$67.26$67.261,952,500——
2011-02-23$66.76$66.762,355,400——
2011-02-22$67.09$67.091,974,600——
2011-02-18$67.64$67.641,882,000——
2011-02-17$67.65$67.651,092,900——
2011-02-16$67.36$67.361,587,400——
2011-02-15$67.09$67.092,147,400——
2011-02-14$67.27$67.271,761,600——
2011-02-11$65.83$65.831,257,000——
2011-02-10$66.22$66.221,589,100——
2011-02-09$66.00$66.002,105,800——
2011-02-08$66.15$66.151,802,800——
2011-02-07$65.25$65.251,586,200——
2011-02-04$65.93$65.931,638,900——
2011-02-03$65.58$65.581,440,900——
2011-02-02$66.15$66.151,541,100——
2011-02-01$65.49$65.494,033,400——
2011-01-31$65.47$65.472,181,200——
2011-01-28$65.08$65.082,319,100——
2011-01-27$67.09$67.091,338,500——
2011-01-26$67.50$67.501,642,900——
2011-01-25$66.84$66.841,966,500——
2011-01-24$67.14$67.141,749,900——
2011-01-21$66.77$66.773,451,900——
2011-01-20$68.78$68.783,184,900——
2011-01-19$66.24$66.241,549,000——
2011-01-18$67.01$67.012,138,000——
2011-01-14$66.57$66.571,626,800——
2011-01-13$67.52$67.521,471,300——
2011-01-12$67.40$67.401,272,100——
2011-01-11$68.30$68.301,602,100——
2011-01-10$66.90$66.901,053,400——
2011-01-07$67.38$67.381,097,300——
2011-01-06$67.26$67.261,559,000——
2011-01-05$66.68$66.682,452,300——
2011-01-04$66.40$66.401,964,800——
2011-01-03$67.20$67.201,791,900——