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.

View year

Historical Stock Price — 2006

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2006-12-29$49.19$49.191,542,500
2006-12-28$49.34$49.341,991,800
2006-12-27$49.16$49.161,891,300
2006-12-26$48.97$48.971,017,000
2006-12-22$49.03$49.031,396,100
2006-12-21$49.66$49.663,317,500
2006-12-20$49.34$49.343,421,500
2006-12-19$49.52$49.528,178,200
2006-12-18$50.23$50.232,535,400
2006-12-15$51.36$51.364,747,600
2006-12-14$51.06$51.063,886,700
2006-12-13$50.17$50.173,479,400
2006-12-12$50.74$50.743,157,100
2006-12-11$51.34$51.343,962,900
2006-12-08$50.67$50.672,822,800
2006-12-07$51.36$51.362,556,100
2006-12-06$51.89$51.892,813,400
2006-12-05$51.50$51.502,474,300
2006-12-04$51.78$51.782,708,500
2006-12-01$52.16$52.163,272,700
2006-11-30$52.26$52.263,891,200
2006-11-29$51.51$51.512,666,700
2006-11-28$51.03$51.033,093,800
2006-11-27$51.09$51.093,234,700
2006-11-24$51.51$51.511,216,800
2006-11-22$51.98$51.983,051,500
2006-11-21$51.00$51.003,219,900
2006-11-20$51.27$51.273,056,200
2006-11-17$50.79$50.795,574,600
2006-11-16$49.95$49.954,318,600
2006-11-15$48.97$48.973,568,500
2006-11-14$48.31$48.312,345,300
2006-11-13$48.27$48.272,719,500
2006-11-10$47.50$47.502,421,000
2006-11-09$47.07$47.072,629,500
2006-11-08$48.66$48.663,343,100
2006-11-07$48.80$48.803,502,600
2006-11-06$48.41$48.412,115,400
2006-11-03$47.52$47.521,870,800
2006-11-02$47.71$47.712,650,100
2006-11-01$47.77$47.774,624,300
2006-10-31$47.60$47.6012,915,800
2006-10-30$43.91$43.912,534,800
2006-10-27$44.02$44.022,570,200
2006-10-26$44.41$44.413,909,100
2006-10-25$44.94$44.942,514,400
2006-10-24$44.91$44.912,023,400
2006-10-23$45.29$45.293,109,200
2006-10-20$45.01$45.014,187,300
2006-10-19$45.92$45.922,351,200
2006-10-18$45.95$45.952,384,200
2006-10-17$45.44$45.442,135,700
2006-10-16$45.56$45.561,956,800
2006-10-13$45.84$45.841,754,500
2006-10-12$45.68$45.682,028,300
2006-10-11$45.21$45.212,427,800
2006-10-10$45.00$45.001,916,500
2006-10-09$45.58$45.581,936,800
2006-10-06$45.66$45.661,979,500
2006-10-05$45.69$45.692,070,800
2006-10-04$46.18$46.183,914,400
2006-10-03$44.88$44.883,105,100
2006-10-02$44.24$44.243,781,900
2006-09-29$44.68$44.682,367,300
2006-09-28$44.74$44.742,786,000
2006-09-27$44.60$44.602,283,300
2006-09-26$44.68$44.682,565,500
2006-09-25$44.71$44.712,853,600
2006-09-22$44.23$44.233,945,800
2006-09-21$43.66$43.663,108,800
2006-09-20$43.66$43.663,432,100
2006-09-19$43.18$43.183,626,600
2006-09-18$43.57$43.572,064,300
2006-09-15$43.90$43.904,813,400
2006-09-14$43.39$43.392,630,400
2006-09-13$43.67$43.672,303,500
2006-09-12$43.87$43.873,152,800
2006-09-11$44.01$44.012,103,300
2006-09-08$43.98$43.981,249,900
2006-09-07$43.50$43.502,919,200
2006-09-06$43.25$43.253,235,500
2006-09-05$44.56$44.562,420,700
2006-09-01$44.25$44.252,431,100
2006-08-31$44.20$44.202,164,600
2006-08-30$44.70$44.702,548,900
2006-08-29$44.33$44.332,515,700
2006-08-28$44.74$44.742,194,800
2006-08-25$44.28$44.282,650,900
2006-08-24$43.76$43.762,783,200
2006-08-23$43.00$43.001,779,100
2006-08-22$42.88$42.882,500,600
2006-08-21$43.00$43.002,521,200
2006-08-18$42.91$42.913,337,200
2006-08-17$43.32$43.322,889,800
2006-08-16$43.08$43.082,877,100
2006-08-15$42.29$42.293,054,800
2006-08-14$41.83$41.833,758,100
2006-08-11$41.45$41.452,514,300
2006-08-10$41.58$41.582,865,400
2006-08-09$41.86$41.863,936,700
2006-08-08$41.73$41.733,090,600
2006-08-07$41.97$41.973,098,100
2006-08-04$42.39$42.392,752,200
2006-08-03$42.65$42.652,877,900
2006-08-02$42.17$42.173,057,200
2006-08-01$41.03$41.032,626,000
2006-07-31$42.05$42.052,557,100
2006-07-28$41.84$41.842,234,100
2006-07-27$41.33$41.333,585,400
2006-07-26$40.97$40.974,566,900
2006-07-25$41.55$41.553,479,300
2006-07-24$41.20$41.203,348,900
2006-07-21$40.73$40.732,882,900
2006-07-20$41.39$41.392,168,400
2006-07-19$42.01$42.013,881,200
2006-07-18$41.12$41.125,172,600
2006-07-17$41.98$41.984,869,000
2006-07-14$43.24$43.245,192,100
2006-07-13$45.21$45.212,814,400
2006-07-12$45.56$45.563,422,800
2006-07-11$46.01$46.012,925,400
2006-07-10$46.29$46.292,456,400
2006-07-07$45.66$45.662,989,700
2006-07-06$47.04$47.042,255,300
2006-07-05$46.28$46.282,020,500
2006-07-03$47.03$47.03983,800
2006-06-30$46.32$46.324,355,300
2006-06-29$46.97$46.973,946,200
2006-06-28$44.98$44.982,479,200
2006-06-27$44.05$44.052,286,000
2006-06-26$45.00$45.001,509,500
2006-06-23$44.99$44.992,003,600
2006-06-22$44.88$44.881,857,400
2006-06-21$45.58$45.582,074,200
2006-06-20$45.03$45.031,872,200
2006-06-19$45.29$45.292,172,400
2006-06-16$46.27$46.273,662,100
2006-06-15$46.90$46.904,353,600
2006-06-14$46.68$46.683,834,300
2006-06-13$45.40$45.403,225,100
2006-06-12$45.67$45.671,627,800
2006-06-09$46.00$46.002,057,100
2006-06-08$46.36$46.363,757,100
2006-06-07$46.73$46.734,031,400
2006-06-06$46.17$46.173,729,400
2006-06-05$45.39$45.397,427,100
2006-06-02$47.71$47.713,312,600
2006-06-01$48.12$48.124,436,100
2006-05-31$46.63$46.633,503,600
2006-05-30$45.27$45.273,116,400
2006-05-26$47.00$47.002,627,500
2006-05-25$46.99$46.993,817,500
2006-05-24$45.42$45.423,804,200
2006-05-23$44.26$44.262,592,900
2006-05-22$45.05$45.053,222,100
2006-05-19$45.69$45.693,604,800
2006-05-18$45.35$45.352,704,200
2006-05-17$45.91$45.913,597,200
2006-05-16$46.95$46.954,361,500
2006-05-15$47.14$47.144,405,600
2006-05-12$45.96$45.963,433,300
2006-05-11$46.67$46.673,168,100
2006-05-10$46.87$46.873,873,200
2006-05-09$47.02$47.022,407,800
2006-05-08$46.16$46.162,869,700
2006-05-05$46.92$46.922,672,600
2006-05-04$46.78$46.781,883,700
2006-05-03$46.09$46.093,926,100
2006-05-02$45.90$45.903,877,800
2006-05-01$45.43$45.433,810,800
2006-04-28$44.85$44.853,246,100
2006-04-27$44.96$44.964,565,000
2006-04-26$44.07$44.075,554,800
2006-04-25$44.08$44.082,586,700
2006-04-24$44.75$44.753,077,400
2006-04-21$44.28$44.282,760,300
2006-04-20$44.83$44.833,238,300
2006-04-19$45.49$45.493,548,700
2006-04-18$45.86$45.862,454,500
2006-04-17$45.00$45.002,411,200
2006-04-13$45.04$45.042,258,500
2006-04-12$44.81$44.813,179,600
2006-04-11$44.31$44.313,735,800
2006-04-10$44.75$44.753,868,800
2006-04-07$44.37$44.373,170,800
2006-04-06$45.00$45.002,856,900
2006-04-05$45.36$45.363,058,100
2006-04-04$46.08$46.083,465,600
2006-04-03$46.34$46.343,444,300
2006-03-31$47.10$47.102,167,400
2006-03-30$47.20$47.202,238,800
2006-03-29$47.22$47.224,628,500
2006-03-28$45.86$45.862,888,200
2006-03-27$47.18$47.182,242,600
2006-03-24$46.46$46.463,006,900
2006-03-23$46.47$46.473,432,200
2006-03-22$48.10$48.104,634,500
2006-03-21$48.31$48.313,855,900
2006-03-20$49.25$49.251,941,500
2006-03-17$49.19$49.193,651,400
2006-03-16$49.10$49.103,339,800
2006-03-15$49.23$49.233,725,200
2006-03-14$48.96$48.962,822,100
2006-03-13$47.92$47.922,511,100
2006-03-10$47.78$47.785,367,600
2006-03-09$47.54$47.5414,459,000
2006-03-08$45.51$45.510
2006-03-07$45.51$45.510
2006-03-06$45.51$45.517,016,000
2006-03-03$45.50$45.504,978,100
2006-03-02$46.36$46.363,786,300
2006-03-01$46.95$46.958,888,900
2006-02-28$47.25$47.2510,080,900
2006-02-27$50.10$50.105,862,300
2006-02-24$49.58$49.584,073,400
2006-02-23$48.50$48.504,028,800
2006-02-22$47.32$47.323,586,900
2006-02-21$46.10$46.102,698,700
2006-02-17$47.06$47.062,635,400
2006-02-16$47.33$47.336,493,100
2006-02-15$45.72$45.725,522,200
2006-02-14$44.38$44.382,678,800
2006-02-13$43.71$43.711,975,700
2006-02-10$44.27$44.273,111,000
2006-02-09$44.24$44.242,473,000
2006-02-08$44.53$44.532,009,000
2006-02-07$44.59$44.592,417,300
2006-02-06$44.24$44.242,323,400
2006-02-03$44.92$44.922,489,100
2006-02-02$45.15$45.152,408,200
2006-02-01$45.27$45.272,964,700
2006-01-31$44.75$44.751,946,600
2006-01-30$44.73$44.731,629,600
2006-01-27$45.23$45.232,221,100
2006-01-26$44.36$44.362,378,500
2006-01-25$43.61$43.613,653,500
2006-01-24$44.42$44.422,718,400
2006-01-23$44.84$44.844,108,500
2006-01-20$44.93$44.934,646,600
2006-01-19$46.05$46.052,179,000
2006-01-18$45.92$45.922,657,300
2006-01-17$46.39$46.391,859,100
2006-01-13$46.21$46.212,557,600
2006-01-12$47.06$47.063,369,000
2006-01-11$47.53$47.532,646,700
2006-01-10$47.96$47.962,729,900
2006-01-09$47.55$47.553,381,900
2006-01-06$47.18$47.183,814,500
2006-01-05$47.12$47.122,694,100
2006-01-04$47.27$47.274,101,000
2006-01-03$46.74$46.744,620,500