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 — 1997

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
1997-12-31$5.73$5.731,065,000
1997-12-30$5.73$5.731,896,600
1997-12-29$5.77$5.77723,600
1997-12-26$5.60$5.60168,000
1997-12-24$5.67$5.67786,600
1997-12-23$5.67$5.67897,000
1997-12-22$5.56$5.561,111,800
1997-12-19$5.48$5.481,971,000
1997-12-18$5.42$5.422,577,600
1997-12-17$5.73$5.732,056,200
1997-12-16$5.65$5.652,212,800
1997-12-15$5.44$5.442,376,000
1997-12-12$5.60$5.601,593,600
1997-12-11$5.67$5.672,274,000
1997-12-10$6.00$6.001,575,600
1997-12-09$6.21$6.211,577,400
1997-12-08$6.23$6.233,488,400
1997-12-05$6.02$6.022,743,800
1997-12-04$6.08$6.082,277,000
1997-12-03$6.08$6.082,998,800
1997-12-02$5.92$5.923,400,200
1997-12-01$5.85$5.852,507,400
1997-11-28$5.82$5.821,861,800
1997-11-26$5.83$5.836,313,200
1997-11-25$5.93$5.932,049,000
1997-11-24$6.17$6.17867,600
1997-11-21$6.65$6.651,903,800
1997-11-20$6.48$6.481,596,600
1997-11-19$6.31$6.31781,800
1997-11-18$6.17$6.17366,600
1997-11-17$6.23$6.232,310,600
1997-11-14$6.01$6.013,447,600
1997-11-13$5.60$5.601,343,400
1997-11-12$5.59$5.592,481,000
1997-11-11$5.86$5.862,116,200
1997-11-10$6.02$6.021,243,200
1997-11-07$6.49$6.49847,800
1997-11-06$6.67$6.671,624,200
1997-11-05$6.46$6.461,647,600
1997-11-04$6.50$6.50876,600
1997-11-03$6.60$6.601,182,600
1997-10-31$6.35$6.35720,000
1997-10-30$6.33$6.331,650,600
1997-10-29$6.54$6.543,739,200
1997-10-28$5.94$5.943,782,400
1997-10-27$5.92$5.921,862,400
1997-10-24$6.49$6.491,806,000
1997-10-23$6.52$6.522,324,400
1997-10-22$6.42$6.421,740,600
1997-10-21$6.83$6.833,507,000
1997-10-20$6.29$6.294,618,200
1997-10-17$6.31$6.312,533,200
1997-10-16$6.46$6.463,094,200
1997-10-15$6.65$6.651,738,800
1997-10-14$6.71$6.712,890,800
1997-10-13$6.69$6.692,467,800
1997-10-10$7.17$7.171,860,000
1997-10-09$7.04$7.042,659,800
1997-10-08$7.48$7.481,972,200
1997-10-07$7.67$7.671,869,600
1997-10-06$7.29$7.292,142,600
1997-10-03$7.15$7.151,532,400
1997-10-02$7.00$7.001,956,000
1997-10-01$6.94$6.942,146,200
1997-09-30$6.98$6.9810,184,400
1997-09-29$6.17$6.174,366,200
1997-09-26$5.98$5.981,155,600
1997-09-25$6.04$6.042,863,800
1997-09-24$6.38$6.382,638,200
1997-09-23$6.58$6.584,855,800
1997-09-22$6.58$6.584,602,600
1997-09-19$6.21$6.213,601,200
1997-09-18$6.04$6.048,704,800
1997-09-17$6.27$6.274,393,800
1997-09-16$5.85$5.852,851,800
1997-09-15$5.81$5.812,125,200
1997-09-12$6.00$6.003,870,000
1997-09-11$5.95$5.953,706,200
1997-09-10$5.58$5.581,977,600
1997-09-09$5.52$5.524,017,600
1997-09-08$5.50$5.504,748,400
1997-09-05$5.13$5.13783,000
1997-09-04$5.13$5.132,637,600
1997-09-03$4.98$4.982,128,200
1997-09-02$4.94$4.943,104,400
1997-08-29$5.06$5.069,798,000
1997-08-28$4.65$4.651,118,400
1997-08-27$4.61$4.61685,200
1997-08-26$4.60$4.601,359,600
1997-08-25$4.61$4.611,015,800
1997-08-22$4.65$4.651,504,200
1997-08-21$4.65$4.652,794,200
1997-08-20$4.79$4.793,441,600
1997-08-19$4.33$4.331,814,400
1997-08-18$4.04$4.041,020,000
1997-08-15$3.90$3.90910,200
1997-08-14$4.04$4.041,081,200
1997-08-13$4.17$4.171,215,000
1997-08-12$4.19$4.19969,000
1997-08-11$4.29$4.291,561,200
1997-08-08$4.27$4.271,387,800
1997-08-07$4.39$4.391,258,800
1997-08-06$4.50$4.50835,800
1997-08-05$4.52$4.52774,000
1997-08-04$4.52$4.52880,200
1997-08-01$4.56$4.56666,000
1997-07-31$4.54$4.541,653,000
1997-07-30$4.56$4.563,370,800
1997-07-29$4.50$4.502,865,000
1997-07-28$4.27$4.274,524,000
1997-07-25$4.40$4.407,976,400
1997-07-24$4.66$4.664,325,400
1997-07-23$4.79$4.794,017,000
1997-07-22$4.67$4.673,279,000
1997-07-21$4.50$4.501,759,200
1997-07-18$4.50$4.501,960,800
1997-07-17$4.67$4.675,829,000
1997-07-16$4.42$4.422,497,800
1997-07-15$4.27$4.27822,600
1997-07-14$4.29$4.29642,600
1997-07-11$4.27$4.27661,200
1997-07-10$4.29$4.29697,200
1997-07-09$4.23$4.232,506,200
1997-07-08$4.40$4.401,684,200
1997-07-07$4.13$4.13888,000
1997-07-03$4.10$4.10488,400
1997-07-02$4.13$4.13834,000
1997-07-01$4.00$4.00682,200
1997-06-30$4.04$4.041,986,000
1997-06-27$3.96$3.96627,600
1997-06-26$4.15$4.151,054,200
1997-06-25$3.81$3.814,244,400
1997-06-24$3.88$3.889,824,400
1997-06-23$4.31$4.31838,200
1997-06-20$4.41$4.412,514,000
1997-06-19$4.41$4.411,589,400
1997-06-18$4.38$4.381,965,600
1997-06-17$4.31$4.31505,800
1997-06-16$4.38$4.38309,000
1997-06-13$4.33$4.33998,400
1997-06-12$4.43$4.433,235,800
1997-06-11$4.31$4.311,194,600
1997-06-10$4.22$4.22885,000
1997-06-09$4.23$4.231,495,200
1997-06-06$4.29$4.292,874,000
1997-06-05$4.13$4.133,786,600
1997-06-04$4.06$4.062,683,800
1997-06-03$3.75$3.75511,200
1997-06-02$3.75$3.751,711,200
1997-05-30$3.75$3.751,087,200
1997-05-29$3.77$3.772,280,000
1997-05-28$3.69$3.692,473,200
1997-05-27$3.65$3.651,723,800
1997-05-23$3.65$3.652,247,600
1997-05-22$3.71$3.711,741,800
1997-05-21$3.75$3.754,320,600
1997-05-20$3.69$3.691,156,800
1997-05-19$3.67$3.67397,200
1997-05-16$3.67$3.671,318,200
1997-05-15$3.63$3.63762,000
1997-05-14$3.63$3.631,204,200
1997-05-13$3.65$3.65885,600
1997-05-12$3.65$3.651,784,400
1997-05-09$3.52$3.521,270,200
1997-05-08$3.63$3.631,544,400
1997-05-07$3.67$3.671,006,200
1997-05-06$3.69$3.693,575,400
1997-05-05$3.75$3.755,626,800
1997-05-02$3.27$3.272,179,200
1997-05-01$3.17$3.173,477,000
1997-04-30$2.96$2.961,555,200
1997-04-29$2.88$2.881,250,400
1997-04-28$2.83$2.832,071,200
1997-04-25$3.00$3.00796,200
1997-04-24$2.96$2.96795,600
1997-04-23$3.00$3.001,848,000
1997-04-22$2.81$2.811,538,400
1997-04-21$2.92$2.921,271,400
1997-04-18$3.00$3.002,514,600
1997-04-17$2.71$2.717,386,600
1997-04-16$3.00$3.006,723,000
1997-04-15$3.35$3.351,558,200
1997-04-14$3.40$3.402,145,000
1997-04-11$3.63$3.633,212,400
1997-04-10$3.94$3.94537,000
1997-04-09$3.79$3.79575,400
1997-04-08$3.92$3.921,007,400
1997-04-07$3.79$3.792,273,400
1997-04-04$3.52$3.523,613,800
1997-04-03$3.35$3.351,944,000
1997-04-02$3.52$3.521,663,200
1997-04-01$3.85$3.851,014,000
1997-03-31$3.97$3.971,895,400
1997-03-27$4.27$4.27385,200
1997-03-26$4.29$4.291,005,000
1997-03-25$4.31$4.312,508,600
1997-03-24$4.32$4.321,110,000
1997-03-21$4.30$4.303,357,600
1997-03-20$4.25$4.252,311,200
1997-03-19$4.31$4.311,663,800
1997-03-18$4.52$4.521,227,000
1997-03-17$4.50$4.502,764,800
1997-03-14$4.67$4.672,041,800
1997-03-13$4.75$4.752,269,800
1997-03-12$4.83$4.833,949,200
1997-03-11$5.02$5.027,672,200
1997-03-10$4.81$4.814,641,600
1997-03-07$4.33$4.335,986,800
1997-03-06$4.10$4.10822,600
1997-03-05$4.08$4.081,162,800
1997-03-04$4.10$4.102,274,000
1997-03-03$4.05$4.052,662,800
1997-02-28$4.15$4.155,118,600
1997-02-27$3.96$3.96723,000
1997-02-26$4.02$4.021,480,200
1997-02-25$4.10$4.102,255,400
1997-02-24$4.06$4.066,174,000
1997-02-21$3.83$3.839,072,000
1997-02-20$3.73$3.731,375,800
1997-02-19$3.71$3.71205,200
1997-02-18$3.71$3.71570,600
1997-02-14$3.73$3.73613,200
1997-02-13$3.71$3.711,029,600
1997-02-12$3.58$3.581,569,600
1997-02-11$3.52$3.521,457,400
1997-02-10$3.58$3.58742,200
1997-02-07$3.65$3.65215,400
1997-02-06$3.60$3.60206,400
1997-02-05$3.65$3.651,248,000
1997-02-04$3.73$3.73484,200
1997-02-03$3.80$3.80675,600
1997-01-31$3.88$3.881,707,600
1997-01-30$3.60$3.60513,000
1997-01-29$3.60$3.60644,400
1997-01-28$3.63$3.631,285,800
1997-01-27$3.63$3.63965,400
1997-01-24$3.56$3.561,239,600
1997-01-23$3.42$3.421,178,400
1997-01-22$3.44$3.44674,400
1997-01-21$3.42$3.42481,800
1997-01-20$3.54$3.54933,000
1997-01-17$3.65$3.651,818,600
1997-01-16$3.69$3.692,751,000
1997-01-15$3.50$3.502,116,200
1997-01-14$3.52$3.52970,200
1997-01-13$3.40$3.401,584,600
1997-01-10$3.38$3.381,336,800
1997-01-09$3.54$3.54885,600
1997-01-08$3.56$3.56550,800
1997-01-07$3.50$3.501,051,800
1997-01-06$3.69$3.691,261,800
1997-01-03$3.60$3.601,462,200
1997-01-02$3.75$3.751,153,200