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 — 2010

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2010-12-31$67.05$67.051,146,500
2010-12-30$66.80$66.801,031,400
2010-12-29$66.64$66.64752,600
2010-12-28$66.64$66.64866,400
2010-12-27$66.92$66.92959,300
2010-12-23$67.22$67.221,228,500
2010-12-22$67.70$67.701,079,400
2010-12-21$68.22$68.221,040,000
2010-12-20$67.98$67.981,666,700
2010-12-17$68.14$68.144,457,500
2010-12-16$67.92$67.921,967,800
2010-12-15$66.06$66.062,649,500
2010-12-14$65.74$65.742,164,900
2010-12-13$65.89$65.891,793,300
2010-12-10$66.30$66.301,786,200
2010-12-09$66.37$66.372,839,100
2010-12-08$67.36$67.361,639,000
2010-12-07$67.11$67.111,722,100
2010-12-06$66.71$66.711,023,500
2010-12-03$67.00$67.001,465,300
2010-12-02$67.08$67.081,706,600
2010-12-01$65.37$65.372,421,900
2010-11-30$63.97$63.973,320,300
2010-11-29$64.72$64.721,578,200
2010-11-26$65.33$65.33673,400
2010-11-24$65.33$65.331,618,100
2010-11-23$63.82$63.821,608,400
2010-11-22$64.86$64.861,324,700
2010-11-19$64.91$64.912,030,700
2010-11-18$64.78$64.781,667,800
2010-11-17$64.52$64.521,466,700
2010-11-16$64.33$64.331,950,600
2010-11-15$65.46$65.462,652,900
2010-11-12$64.50$64.502,209,400
2010-11-11$64.73$64.732,513,700
2010-11-10$64.95$64.954,247,500
2010-11-09$63.39$63.392,550,800
2010-11-08$63.03$63.031,983,500
2010-11-05$62.78$62.782,732,900
2010-11-04$62.50$62.503,722,900
2010-11-03$63.00$63.002,670,400
2010-11-02$63.00$63.001,820,400
2010-11-01$62.55$62.552,261,000
2010-10-29$62.71$62.713,419,300
2010-10-28$63.85$63.855,739,200
2010-10-27$62.48$62.483,936,800
2010-10-26$59.99$59.993,342,400
2010-10-25$59.90$59.903,173,600
2010-10-22$58.75$58.751,348,600
2010-10-21$58.31$58.311,524,900
2010-10-20$58.66$58.662,185,000
2010-10-19$58.27$58.272,128,900
2010-10-18$58.53$58.531,589,000
2010-10-15$57.66$57.662,364,300
2010-10-14$56.98$56.981,461,500
2010-10-13$57.19$57.191,364,000
2010-10-12$56.93$56.931,753,700
2010-10-11$57.06$57.061,316,300
2010-10-08$57.59$57.592,185,400
2010-10-07$57.24$57.241,490,200
2010-10-06$56.63$56.632,112,700
2010-10-05$57.53$57.532,021,600
2010-10-04$56.66$56.662,498,100
2010-10-01$56.53$56.532,598,400
2010-09-30$56.12$56.122,945,000
2010-09-29$55.36$55.362,482,200
2010-09-28$55.42$55.422,833,700
2010-09-27$54.79$54.792,294,000
2010-09-24$56.42$56.422,946,600
2010-09-23$55.24$55.243,208,000
2010-09-22$54.86$54.868,035,500
2010-09-21$58.23$58.232,373,200
2010-09-20$57.80$57.802,348,000
2010-09-17$57.92$57.923,223,900
2010-09-16$57.67$57.671,809,300
2010-09-15$58.42$58.421,814,000
2010-09-14$57.91$57.911,549,100
2010-09-13$57.81$57.811,464,100
2010-09-10$57.68$57.681,145,300
2010-09-09$57.01$57.012,217,400
2010-09-08$57.15$57.152,202,200
2010-09-07$56.14$56.142,493,000
2010-09-03$56.24$56.241,489,400
2010-09-02$55.25$55.251,358,200
2010-09-01$55.31$55.311,559,900
2010-08-31$53.80$53.802,015,500
2010-08-30$53.92$53.921,325,100
2010-08-27$54.60$54.601,704,400
2010-08-26$53.91$53.912,401,300
2010-08-25$55.37$55.373,220,400
2010-08-24$53.84$53.841,780,600
2010-08-23$54.91$54.911,166,600
2010-08-20$55.38$55.382,368,500
2010-08-19$55.06$55.062,326,000
2010-08-18$56.52$56.521,629,000
2010-08-17$56.91$56.911,954,300
2010-08-16$55.85$55.851,725,400
2010-08-13$55.94$55.942,013,500
2010-08-12$56.61$56.612,313,100
2010-08-11$55.80$55.802,862,600
2010-08-10$57.86$57.861,877,000
2010-08-09$57.58$57.581,382,200
2010-08-06$57.66$57.662,118,100
2010-08-05$57.16$57.161,959,600
2010-08-04$57.39$57.392,730,700
2010-08-03$57.34$57.343,250,100
2010-08-02$57.19$57.192,673,700
2010-07-30$55.88$55.885,111,700
2010-07-29$56.53$56.533,652,700
2010-07-28$55.92$55.927,050,200
2010-07-27$57.75$57.755,557,900
2010-07-26$57.89$57.897,694,200
2010-07-23$53.47$53.477,235,500
2010-07-22$56.17$56.173,925,200
2010-07-21$54.97$54.976,481,500
2010-07-20$54.02$54.024,645,500
2010-07-19$53.18$53.182,853,100
2010-07-16$51.86$51.863,174,900
2010-07-15$53.43$53.432,423,500
2010-07-14$52.97$52.971,766,100
2010-07-13$52.68$52.682,178,100
2010-07-12$51.66$51.661,949,100
2010-07-09$51.71$51.712,697,400
2010-07-08$50.85$50.852,883,400
2010-07-07$49.84$49.842,683,700
2010-07-06$48.38$48.384,234,800
2010-07-02$49.42$49.429,247,400
2010-07-01$46.73$46.734,042,500
2010-06-30$47.45$47.453,765,500
2010-06-29$48.70$48.702,757,200
2010-06-28$49.57$49.571,759,200
2010-06-25$49.57$49.578,681,200
2010-06-24$49.38$49.381,879,900
2010-06-23$49.69$49.691,805,400
2010-06-22$49.54$49.542,456,700
2010-06-21$49.49$49.492,623,600
2010-06-18$49.86$49.865,777,600
2010-06-17$49.01$49.012,752,600
2010-06-16$48.35$48.351,993,200
2010-06-15$48.12$48.123,091,400
2010-06-14$46.79$46.793,087,000
2010-06-11$46.22$46.225,927,500
2010-06-10$48.14$48.142,922,000
2010-06-09$47.08$47.082,906,800
2010-06-08$46.85$46.854,041,700
2010-06-07$47.64$47.642,879,100
2010-06-04$47.84$47.843,961,400
2010-06-03$49.25$49.253,064,500
2010-06-02$48.35$48.353,027,200
2010-06-01$47.22$47.223,682,400
2010-05-28$47.43$47.434,610,200
2010-05-27$48.28$48.283,515,600
2010-05-26$47.36$47.363,773,700
2010-05-25$48.35$48.352,739,100
2010-05-24$48.27$48.273,856,200
2010-05-21$48.98$48.985,046,900
2010-05-20$49.25$49.253,899,600
2010-05-19$50.46$50.462,533,100
2010-05-18$50.70$50.702,410,300
2010-05-17$50.57$50.572,257,100
2010-05-14$50.13$50.134,030,000
2010-05-13$51.40$51.401,659,100
2010-05-12$52.04$52.042,375,100
2010-05-11$51.38$51.382,877,300
2010-05-10$51.13$51.133,245,400
2010-05-07$50.39$50.394,704,300
2010-05-06$50.70$50.704,393,100
2010-05-05$52.70$52.702,541,100
2010-05-04$52.30$52.302,288,900
2010-05-03$53.60$53.602,057,900
2010-04-30$53.29$53.293,348,900
2010-04-29$53.31$53.313,556,000
2010-04-28$52.12$52.122,421,200
2010-04-27$52.10$52.103,761,500
2010-04-26$52.25$52.252,290,900
2010-04-23$52.59$52.592,519,600
2010-04-22$52.03$52.034,324,100
2010-04-21$52.72$52.724,325,200
2010-04-20$53.91$53.913,533,200
2010-04-19$54.79$54.793,076,100
2010-04-16$53.64$53.644,198,100
2010-04-15$54.41$54.412,795,400
2010-04-14$54.96$54.964,327,000
2010-04-13$55.07$55.074,166,100
2010-04-12$56.00$56.002,397,400
2010-04-09$56.52$56.522,716,000
2010-04-08$56.43$56.432,395,400
2010-04-07$57.27$57.271,869,100
2010-04-06$57.50$57.501,422,600
2010-04-05$57.53$57.531,142,200
2010-04-01$57.52$57.521,564,700
2010-03-31$57.39$57.391,620,500
2010-03-30$57.71$57.712,030,100
2010-03-29$58.42$58.421,800,700
2010-03-26$58.15$58.151,347,000
2010-03-25$58.27$58.272,407,000
2010-03-24$58.85$58.851,809,200
2010-03-23$59.84$59.841,232,300
2010-03-22$59.82$59.822,156,500
2010-03-19$59.63$59.635,024,800
2010-03-18$59.20$59.202,512,000
2010-03-17$59.36$59.361,982,700
2010-03-16$59.73$59.733,238,200
2010-03-15$58.90$58.901,407,400
2010-03-12$58.76$58.761,468,700
2010-03-11$58.78$58.781,865,700
2010-03-10$58.71$58.712,248,600
2010-03-09$57.84$57.842,195,300
2010-03-08$57.67$57.673,064,900
2010-03-05$57.21$57.211,526,500
2010-03-04$56.66$56.661,377,900
2010-03-03$56.79$56.791,990,500
2010-03-02$57.31$57.312,530,800
2010-03-01$56.78$56.782,567,900
2010-02-26$55.01$55.012,847,100
2010-02-25$54.89$54.892,826,200
2010-02-24$55.29$55.295,288,000
2010-02-23$55.25$55.252,910,600
2010-02-22$55.67$55.672,170,300
2010-02-19$56.61$56.613,057,000
2010-02-18$55.98$55.982,593,500
2010-02-17$56.23$56.232,497,800
2010-02-16$55.12$55.123,277,000
2010-02-12$55.21$55.212,954,300
2010-02-11$55.69$55.692,824,200
2010-02-10$54.39$54.392,562,700
2010-02-09$54.09$54.092,965,000
2010-02-08$52.84$52.842,852,400
2010-02-05$53.53$53.533,638,700
2010-02-04$53.10$53.102,799,600
2010-02-03$54.60$54.602,155,700
2010-02-02$54.94$54.942,178,500
2010-02-01$53.91$53.912,481,700
2010-01-29$53.74$53.743,127,900
2010-01-28$53.27$53.273,314,100
2010-01-27$53.58$53.582,963,800
2010-01-26$53.00$53.002,346,700
2010-01-25$52.67$52.672,265,300
2010-01-22$53.06$53.063,167,800
2010-01-21$53.21$53.214,731,200
2010-01-20$54.72$54.722,634,100
2010-01-19$55.23$55.232,941,500
2010-01-15$54.18$54.182,997,200
2010-01-14$54.36$54.361,769,900
2010-01-13$54.08$54.082,130,600
2010-01-12$53.25$53.253,242,900
2010-01-11$53.90$53.901,813,300
2010-01-08$54.08$54.082,996,300
2010-01-07$52.99$52.993,659,900
2010-01-06$53.43$53.435,555,800
2010-01-05$53.38$53.384,899,400
2010-01-04$53.64$53.642,469,700