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 — 1995

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
1995-12-29$3.25$3.251,121,400
1995-12-28$3.31$3.313,063,600
1995-12-27$3.60$3.602,383,800
1995-12-26$3.85$3.857,041,000
1995-12-22$3.44$3.447,040,400
1995-12-21$2.90$2.903,021,000
1995-12-20$2.71$2.712,481,000
1995-12-19$2.50$2.501,193,400
1995-12-18$2.33$2.33419,400
1995-12-15$2.31$2.31553,200
1995-12-14$2.31$2.31362,400
1995-12-13$2.35$2.35719,400
1995-12-12$2.31$2.31462,000
1995-12-11$2.40$2.40866,400
1995-12-08$2.46$2.461,433,400
1995-12-07$2.50$2.501,627,800
1995-12-06$2.46$2.46778,800
1995-12-05$2.40$2.401,624,800
1995-12-04$2.40$2.401,535,400
1995-12-01$2.25$2.25381,000
1995-11-30$2.29$2.29581,400
1995-11-29$2.23$2.23422,400
1995-11-28$2.25$2.251,063,200
1995-11-27$2.31$2.311,559,400
1995-11-24$2.13$2.13355,200
1995-11-22$2.08$2.08160,200
1995-11-21$2.04$2.04194,400
1995-11-20$2.13$2.131,335,600
1995-11-17$2.06$2.06168,000
1995-11-16$2.06$2.06452,400
1995-11-15$2.08$2.081,063,800
1995-11-14$2.13$2.131,315,200
1995-11-13$2.19$2.19338,400
1995-11-10$2.29$2.291,175,400
1995-11-09$2.33$2.331,423,800
1995-11-08$2.29$2.294,048,800
1995-11-07$2.27$2.27682,200
1995-11-06$2.29$2.291,015,200
1995-11-03$2.27$2.271,192,800
1995-11-02$2.20$2.202,695,200
1995-11-01$2.42$2.425,065,800
1995-10-31$1.98$1.982,421,000
1995-10-30$1.85$1.851,848,000
1995-10-27$1.71$1.711,248,000
1995-10-26$1.52$1.522,043,000
1995-10-25$1.67$1.671,080,000
1995-10-24$1.75$1.75940,200
1995-10-23$1.77$1.772,222,400
1995-10-20$1.79$1.793,990,000
1995-10-19$1.60$1.60895,800
1995-10-18$1.65$1.651,554,000
1995-10-17$1.58$1.58903,000
1995-10-16$1.52$1.52717,000
1995-10-13$1.50$1.50727,800
1995-10-12$1.41$1.41538,200
1995-10-11$1.34$1.34551,400
1995-10-10$1.23$1.23754,800
1995-10-09$1.21$1.21523,800
1995-10-06$1.25$1.25238,800
1995-10-05$1.23$1.23685,800
1995-10-04$1.26$1.26301,200
1995-10-03$1.27$1.27766,200
1995-10-02$1.36$1.36396,000
1995-09-29$1.31$1.31413,400
1995-09-28$1.31$1.31133,800
1995-09-27$1.31$1.31709,200
1995-09-26$1.40$1.40244,800
1995-09-25$1.35$1.35461,400
1995-09-22$1.35$1.35260,400
1995-09-21$1.42$1.42575,400
1995-09-20$1.42$1.42498,000
1995-09-19$1.42$1.42603,000
1995-09-18$1.42$1.42693,000
1995-09-15$1.42$1.42759,600
1995-09-14$1.45$1.45517,200
1995-09-13$1.35$1.35648,000
1995-09-12$1.41$1.411,329,000
1995-09-11$1.28$1.281,003,200
1995-09-08$1.19$1.19775,200
1995-09-07$1.25$1.251,062,000
1995-09-06$1.29$1.291,180,200
1995-09-05$1.34$1.341,188,000
1995-09-01$1.21$1.21308,400
1995-08-31$1.15$1.1573,200
1995-08-30$1.15$1.15288,000
1995-08-29$1.10$1.10477,600
1995-08-28$1.17$1.17313,800
1995-08-25$1.21$1.21288,600
1995-08-24$1.19$1.19534,000
1995-08-23$1.23$1.23127,200
1995-08-22$1.25$1.25336,000
1995-08-21$1.27$1.27286,200
1995-08-18$1.27$1.27262,200
1995-08-17$1.23$1.23469,800
1995-08-16$1.27$1.27348,000
1995-08-15$1.27$1.27294,600
1995-08-14$1.25$1.25298,200
1995-08-11$1.27$1.271,246,200
1995-08-10$1.29$1.291,447,200
1995-08-09$1.02$1.02106,200
1995-08-08$1.02$1.02297,600
1995-08-07$1.04$1.0437,200
1995-08-04$1.02$1.02111,000
1995-08-03$1.02$1.02315,000
1995-08-02$1.06$1.06258,000
1995-08-01$1.10$1.10307,200
1995-07-31$1.13$1.13781,200
1995-07-28$1.06$1.06685,200
1995-07-27$1.06$1.06359,400
1995-07-26$1.00$1.00448,200
1995-07-25$1.04$1.04147,000
1995-07-24$1.04$1.04270,600
1995-07-21$1.00$1.00266,400
1995-07-20$0.91$0.91301,800
1995-07-19$0.98$0.98231,000
1995-07-18$1.02$1.02138,600
1995-07-17$1.04$1.04466,800
1995-07-14$1.02$1.02290,400
1995-07-13$1.04$1.04162,600
1995-07-12$1.06$1.06624,000
1995-07-11$1.08$1.081,045,800
1995-07-10$1.00$1.00694,800
1995-07-07$0.96$0.96879,000
1995-07-06$1.02$1.022,343,000
1995-07-05$0.92$0.92345,000
1995-07-03$0.94$0.9433,600
1995-06-30$0.94$0.94942,600
1995-06-29$0.88$0.8885,800
1995-06-28$0.88$0.88323,400
1995-06-27$0.85$0.85143,400
1995-06-26$0.86$0.86174,000
1995-06-23$0.88$0.88216,600
1995-06-22$0.88$0.88287,400
1995-06-21$0.83$0.83165,000
1995-06-20$0.85$0.85342,600
1995-06-19$0.92$0.921,230,600
1995-06-16$0.85$0.85329,400
1995-06-15$0.82$0.82180,000
1995-06-14$0.84$0.841,636,200
1995-06-13$0.82$0.821,203,600
1995-06-12$0.75$0.75568,800
1995-06-09$0.73$0.7341,400
1995-06-08$0.73$0.7352,800
1995-06-07$0.71$0.7166,000
1995-06-06$0.73$0.7387,600
1995-06-05$0.71$0.7145,600
1995-06-02$0.71$0.71114,000
1995-06-01$0.73$0.73328,200
1995-05-31$0.75$0.75208,800
1995-05-30$0.75$0.75710,400
1995-05-26$0.69$0.6938,400
1995-05-25$0.73$0.73150,000
1995-05-24$0.73$0.7399,000
1995-05-23$0.71$0.7165,400
1995-05-22$0.71$0.7174,400
1995-05-19$0.67$0.6754,000
1995-05-18$0.65$0.65129,000
1995-05-17$0.69$0.69123,600
1995-05-16$0.73$0.7337,800
1995-05-15$0.72$0.72175,800
1995-05-12$0.71$0.71269,400
1995-05-11$0.69$0.69216,600
1995-05-10$0.73$0.73354,600
1995-05-09$0.73$0.7384,000
1995-05-08$0.71$0.7162,400
1995-05-05$0.71$0.71153,600
1995-05-04$0.71$0.7197,800
1995-05-03$0.73$0.73856,800
1995-05-02$0.68$0.68198,600
1995-05-01$0.68$0.68163,200
1995-04-28$0.67$0.67259,800
1995-04-27$0.67$0.67208,200
1995-04-26$0.65$0.65126,600
1995-04-25$0.66$0.66248,400
1995-04-24$0.65$0.65463,800
1995-04-21$0.66$0.6687,600
1995-04-20$0.65$0.65108,600
1995-04-19$0.66$0.66112,200
1995-04-18$0.66$0.66769,800
1995-04-17$0.61$0.6149,200
1995-04-13$0.58$0.5851,000
1995-04-12$0.60$0.6054,600
1995-04-11$0.58$0.5848,000
1995-04-10$0.63$0.63105,000
1995-04-07$0.61$0.61183,600
1995-04-06$0.64$0.6467,800
1995-04-05$0.65$0.651,614,000
1995-04-04$0.60$0.60189,600
1995-04-03$0.63$0.6384,000
1995-03-31$0.63$0.63366,600
1995-03-30$0.63$0.6384,000
1995-03-29$0.66$0.66161,400
1995-03-28$0.63$0.63118,200
1995-03-27$0.65$0.6563,600
1995-03-24$0.67$0.67425,400
1995-03-23$0.65$0.65160,800
1995-03-22$0.69$0.69496,200
1995-03-21$0.63$0.63327,000
1995-03-20$0.67$0.67452,400
1995-03-17$0.69$0.691,659,600
1995-03-16$0.75$0.751,763,400
1995-03-15$0.60$0.60115,200
1995-03-14$0.63$0.6387,000
1995-03-13$0.60$0.60478,800
1995-03-10$0.63$0.63327,600
1995-03-09$0.67$0.67187,800
1995-03-08$0.69$0.69271,800
1995-03-07$0.69$0.69369,000
1995-03-06$0.69$0.69458,400
1995-03-03$0.69$0.691,458,000
1995-03-02$0.63$0.63250,200
1995-03-01$0.63$0.63168,000
1995-02-28$0.63$0.6372,000
1995-02-27$0.63$0.63210,000
1995-02-24$0.63$0.63193,800
1995-02-23$0.63$0.6398,400
1995-02-22$0.63$0.63121,200
1995-02-21$0.63$0.63268,800
1995-02-17$0.65$0.65345,600
1995-02-16$0.69$0.691,048,200
1995-02-15$0.67$0.671,609,800
1995-02-14$0.60$0.60627,000
1995-02-13$0.54$0.54624,000
1995-02-10$0.48$0.48531,600
1995-02-09$0.44$0.44234,000
1995-02-08$0.47$0.47401,400
1995-02-07$0.46$0.46189,000
1995-02-06$0.48$0.4860,000
1995-02-03$0.46$0.46880,200
1995-02-02$0.47$0.47330,600
1995-02-01$0.44$0.44833,400
1995-01-31$0.43$0.432,020,200
1995-01-30$0.42$0.421,486,200
1995-01-27$0.42$0.4279,800
1995-01-26$0.43$0.43315,000
1995-01-25$0.43$0.431,043,400
1995-01-24$0.42$0.42709,200
1995-01-23$0.42$0.42171,000
1995-01-20$0.42$0.4231,200
1995-01-19$0.39$0.39539,400
1995-01-18$0.40$0.4033,000
1995-01-17$0.40$0.4069,600
1995-01-16$0.44$0.4488,200
1995-01-13$0.44$0.4455,800
1995-01-12$0.41$0.4152,200
1995-01-11$0.42$0.42298,200
1995-01-10$0.42$0.42274,200
1995-01-09$0.41$0.41532,800
1995-01-06$0.42$0.421,041,000
1995-01-05$0.38$0.38193,800
1995-01-04$0.42$0.42178,200
1995-01-03$0.40$0.40319,800