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 — 1994

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
1994-12-30$0.35$0.35400,200
1994-12-29$0.35$0.35390,600
1994-12-28$0.35$0.35319,200
1994-12-27$0.36$0.36453,000
1994-12-23$0.38$0.3886,400
1994-12-22$0.38$0.38329,400
1994-12-21$0.36$0.36721,200
1994-12-20$0.35$0.35124,200
1994-12-19$0.38$0.3829,400
1994-12-16$0.35$0.35210,600
1994-12-15$0.38$0.38378,600
1994-12-14$0.38$0.38232,200
1994-12-13$0.38$0.38130,800
1994-12-12$0.38$0.3851,600
1994-12-09$0.38$0.38436,800
1994-12-08$0.40$0.40259,800
1994-12-07$0.42$0.42137,400
1994-12-06$0.40$0.4094,200
1994-12-05$0.42$0.42106,200
1994-12-02$0.42$0.4292,400
1994-12-01$0.44$0.4493,600
1994-11-30$0.42$0.4253,400
1994-11-29$0.42$0.4281,000
1994-11-28$0.42$0.4216,200
1994-11-25$0.43$0.430
1994-11-23$0.43$0.43225,600
1994-11-22$0.42$0.42597,600
1994-11-21$0.42$0.42305,400
1994-11-18$0.42$0.426,600
1994-11-17$0.42$0.4258,800
1994-11-16$0.40$0.4044,400
1994-11-15$0.42$0.4261,200
1994-11-14$0.44$0.44176,400
1994-11-11$0.42$0.4227,000
1994-11-10$0.42$0.4271,400
1994-11-09$0.44$0.4419,800
1994-11-08$0.44$0.4442,600
1994-11-07$0.45$0.45135,000
1994-11-04$0.44$0.44252,600
1994-11-03$0.48$0.4879,200
1994-11-02$0.44$0.4476,800
1994-11-01$0.46$0.46121,800
1994-10-31$0.48$0.48326,400
1994-10-28$0.49$0.491,851,000
1994-10-27$0.44$0.44114,600
1994-10-26$0.40$0.4057,600
1994-10-25$0.40$0.40403,200
1994-10-24$0.43$0.43416,400
1994-10-21$0.42$0.42159,600
1994-10-20$0.40$0.40810,600
1994-10-19$0.42$0.42106,800
1994-10-18$0.40$0.4048,000
1994-10-17$0.40$0.40218,400
1994-10-14$0.41$0.41260,400
1994-10-13$0.41$0.41841,200
1994-10-12$0.38$0.38121,800
1994-10-11$0.40$0.4014,400
1994-10-10$0.38$0.3846,800
1994-10-07$0.40$0.4043,200
1994-10-06$0.38$0.3818,600
1994-10-05$0.39$0.39136,200
1994-10-04$0.38$0.3891,200
1994-10-03$0.40$0.40106,800
1994-09-30$0.40$0.401,800
1994-09-29$0.41$0.4133,000
1994-09-28$0.42$0.42142,200
1994-09-27$0.42$0.4212,000
1994-09-26$0.44$0.4470,800
1994-09-23$0.46$0.4613,200
1994-09-22$0.46$0.4642,000
1994-09-21$0.44$0.4467,200
1994-09-20$0.44$0.44390,600
1994-09-19$0.48$0.480
1994-09-16$0.48$0.4861,800
1994-09-15$0.48$0.4810,200
1994-09-14$0.49$0.4951,600
1994-09-13$0.50$0.5055,200
1994-09-12$0.49$0.4927,600
1994-09-09$0.48$0.48172,200
1994-09-08$0.50$0.5033,600
1994-09-07$0.50$0.5031,800
1994-09-06$0.48$0.4845,000
1994-09-02$0.46$0.4627,600
1994-09-01$0.46$0.4612,000
1994-08-31$0.46$0.4686,400
1994-08-30$0.50$0.50390,000
1994-08-29$0.46$0.46198,000
1994-08-26$0.46$0.4619,800
1994-08-25$0.50$0.5015,000
1994-08-24$0.46$0.46168,600
1994-08-23$0.50$0.5043,200
1994-08-22$0.52$0.5211,400
1994-08-19$0.48$0.48429,000
1994-08-18$0.50$0.5021,600
1994-08-17$0.50$0.50922,200
1994-08-16$0.52$0.52552,600
1994-08-15$0.46$0.46138,600
1994-08-12$0.45$0.4525,800
1994-08-11$0.44$0.44621,000
1994-08-10$0.42$0.4225,800
1994-08-09$0.42$0.4260,000
1994-08-08$0.42$0.4291,800
1994-08-05$0.46$0.4651,000
1994-08-04$0.46$0.4632,400
1994-08-03$0.46$0.4645,600
1994-08-02$0.42$0.4271,400
1994-08-01$0.42$0.42272,400
1994-07-29$0.46$0.46115,200
1994-07-28$0.40$0.40206,400
1994-07-27$0.48$0.48150,000
1994-07-26$0.48$0.4863,600
1994-07-25$0.48$0.48313,800
1994-07-22$0.50$0.50339,600
1994-07-21$0.46$0.46121,800
1994-07-20$0.43$0.4325,800
1994-07-19$0.44$0.4427,000
1994-07-18$0.44$0.44111,000
1994-07-15$0.44$0.4428,800
1994-07-14$0.46$0.46115,800
1994-07-13$0.45$0.4545,600
1994-07-12$0.47$0.47149,400
1994-07-11$0.48$0.48113,400
1994-07-08$0.48$0.4845,000
1994-07-07$0.50$0.5089,400
1994-07-06$0.46$0.4667,800
1994-07-05$0.46$0.46163,200
1994-07-01$0.44$0.4472,600
1994-06-30$0.41$0.41394,800
1994-06-29$0.41$0.41472,200
1994-06-28$0.41$0.41649,200
1994-06-27$0.41$0.41517,200
1994-06-24$0.42$0.42432,600
1994-06-23$0.44$0.44684,000
1994-06-22$0.48$0.48153,000
1994-06-21$0.42$0.42282,600
1994-06-20$0.48$0.48157,800
1994-06-17$0.50$0.50116,400
1994-06-16$0.52$0.52783,600
1994-06-15$0.52$0.5251,600
1994-06-14$0.52$0.5282,200
1994-06-13$0.50$0.50458,400
1994-06-10$0.50$0.50467,400
1994-06-09$0.54$0.54620,400
1994-06-08$0.54$0.541,035,600
1994-06-07$0.58$0.5821,600
1994-06-06$0.60$0.6046,800
1994-06-03$0.60$0.60105,000
1994-06-02$0.60$0.6027,000
1994-06-01$0.65$0.659,600
1994-05-31$0.63$0.6324,600
1994-05-27$0.63$0.63433,200
1994-05-26$0.60$0.6016,200
1994-05-25$0.65$0.6517,400
1994-05-24$0.63$0.63170,400
1994-05-23$0.63$0.63220,200
1994-05-20$0.65$0.6510,200
1994-05-19$0.65$0.6590,000
1994-05-18$0.65$0.65249,600
1994-05-17$0.65$0.65156,000
1994-05-16$0.69$0.69132,000
1994-05-13$0.71$0.71358,200
1994-05-12$0.69$0.6982,800
1994-05-11$0.67$0.67325,800
1994-05-10$0.67$0.6763,000
1994-05-09$0.63$0.6367,800
1994-05-06$0.65$0.6570,200
1994-05-05$0.69$0.69112,200
1994-05-04$0.71$0.71807,000
1994-05-03$0.67$0.67196,200
1994-05-02$0.60$0.60687,000
1994-04-29$0.60$0.60185,400
1994-04-28$0.56$0.5687,600
1994-04-26$0.56$0.5610,800
1994-04-25$0.56$0.5696,600
1994-04-22$0.56$0.5684,000
1994-04-21$0.58$0.5876,200
1994-04-20$0.56$0.56177,000
1994-04-19$0.58$0.5855,800
1994-04-18$0.63$0.6368,400
1994-04-15$0.60$0.60204,000
1994-04-14$0.54$0.5493,000
1994-04-13$0.58$0.58645,600
1994-04-12$0.58$0.58261,000
1994-04-11$0.63$0.6382,200
1994-04-08$0.65$0.6535,400
1994-04-07$0.65$0.65435,000
1994-04-06$0.65$0.65103,200
1994-04-05$0.67$0.67161,400
1994-04-04$0.64$0.64205,200
1994-03-31$0.65$0.65106,200
1994-03-30$0.65$0.65247,800
1994-03-29$0.67$0.67114,600
1994-03-28$0.67$0.67244,200
1994-03-25$0.71$0.7116,200
1994-03-24$0.68$0.68146,400
1994-03-23$0.69$0.69100,800
1994-03-22$0.71$0.71156,600
1994-03-21$0.75$0.7588,200
1994-03-18$0.73$0.7395,400
1994-03-17$0.75$0.75222,000
1994-03-16$0.73$0.73231,000
1994-03-15$0.73$0.73172,200
1994-03-14$0.75$0.75206,400
1994-03-11$0.71$0.71614,400
1994-03-10$0.79$0.7973,800
1994-03-09$0.81$0.8181,600
1994-03-08$0.81$0.8175,600
1994-03-07$0.79$0.7975,600
1994-03-04$0.81$0.81358,200
1994-03-03$0.77$0.77118,800
1994-03-02$0.83$0.83158,400
1994-03-01$0.83$0.83154,800
1994-02-28$0.88$0.8812,600
1994-02-25$0.90$0.9051,600
1994-02-24$0.92$0.92272,400
1994-02-23$0.94$0.94222,600
1994-02-22$0.96$0.9662,400
1994-02-18$0.96$0.96220,800
1994-02-17$0.97$0.97214,200
1994-02-16$0.98$0.9816,200
1994-02-15$0.94$0.94331,200
1994-02-14$1.00$1.00152,400
1994-02-11$0.93$0.93261,600
1994-02-10$0.88$0.88141,600
1994-02-09$0.92$0.92415,800
1994-02-08$0.92$0.92388,800
1994-02-07$0.92$0.92165,600
1994-02-04$0.94$0.94258,600
1994-02-03$1.02$1.02322,200
1994-02-02$1.02$1.02138,600
1994-02-01$1.04$1.0483,400
1994-01-31$1.08$1.0821,600
1994-01-28$1.04$1.0479,800
1994-01-27$1.04$1.04100,200
1994-01-26$1.06$1.06222,000
1994-01-25$1.06$1.06257,400
1994-01-24$1.06$1.06589,200
1994-01-21$1.04$1.0465,400
1994-01-20$1.04$1.0498,400
1994-01-19$1.03$1.03131,400
1994-01-18$1.04$1.04421,800
1994-01-17$1.04$1.04241,800
1994-01-14$1.04$1.041,094,400
1994-01-13$1.04$1.04314,400
1994-01-12$1.04$1.04271,800
1994-01-11$1.02$1.02132,600
1994-01-10$1.00$1.001,663,800
1994-01-07$1.00$1.00760,200
1994-01-06$0.92$0.92344,400
1994-01-05$0.96$0.9649,200
1994-01-04$0.90$0.9058,200
1994-01-03$0.94$0.9461,200