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 — 1993

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
1993-12-31$0.96$0.96979,200
1993-12-30$0.92$0.92597,000
1993-12-29$0.94$0.9482,200
1993-12-28$1.00$1.0089,400
1993-12-27$1.02$1.0255,800
1993-12-23$0.94$0.94325,800
1993-12-22$0.96$0.96353,400
1993-12-21$0.96$0.9687,600
1993-12-20$0.96$0.9648,000
1993-12-17$0.98$0.98132,000
1993-12-16$0.96$0.9616,200
1993-12-15$0.98$0.9881,600
1993-12-14$0.96$0.96449,400
1993-12-13$1.02$1.02118,200
1993-12-10$1.13$1.13132,600
1993-12-09$1.10$1.10384,600
1993-12-08$1.17$1.17544,200
1993-12-07$1.21$1.211,903,800
1993-12-06$1.31$1.313,201,000
1993-12-03$1.15$1.15843,600
1993-12-02$1.05$1.05787,800
1993-12-01$1.02$1.02443,400
1993-11-30$1.00$1.0054,600
1993-11-29$1.02$1.02186,600
1993-11-26$1.00$1.0085,800
1993-11-24$1.00$1.00298,800
1993-11-23$0.94$0.94222,600
1993-11-22$0.96$0.96339,000
1993-11-19$1.00$1.00507,000
1993-11-18$0.94$0.94426,600
1993-11-17$0.96$0.96554,400
1993-11-16$0.98$0.98860,400
1993-11-15$1.00$1.001,267,200
1993-11-12$0.95$0.9519,800
1993-11-11$0.94$0.94675,000
1993-11-10$0.94$0.94181,800
1993-11-09$0.96$0.9658,800
1993-11-08$0.96$0.96171,000
1993-11-05$0.96$0.9688,200
1993-11-04$0.98$0.98268,800
1993-11-03$1.00$1.001,395,000
1993-11-02$0.96$0.9681,000
1993-11-01$0.94$0.9484,000
1993-10-29$0.94$0.9494,200
1993-10-28$0.88$0.88264,600
1993-10-27$1.00$1.0048,000
1993-10-26$0.98$0.9837,800
1993-10-25$0.96$0.96171,000
1993-10-22$1.00$1.00152,400
1993-10-21$0.94$0.94601,800
1993-10-20$1.02$1.02181,800
1993-10-19$0.98$0.98545,400
1993-10-18$1.03$1.03364,800
1993-10-15$1.02$1.02460,200
1993-10-14$1.00$1.00233,400
1993-10-13$1.02$1.021,252,800
1993-10-12$0.94$0.94417,000
1993-10-11$0.90$0.9050,400
1993-10-08$0.90$0.90927,600
1993-10-07$0.83$0.83146,400
1993-10-06$0.84$0.84210,600
1993-10-05$0.83$0.83265,800
1993-10-04$0.88$0.88301,800
1993-10-01$0.85$0.85151,200
1993-09-30$0.83$0.83385,800
1993-09-29$0.85$0.85601,200
1993-09-28$0.83$0.83673,800
1993-09-27$0.71$0.71619,200
1993-09-24$0.71$0.7189,400
1993-09-23$0.71$0.71115,800
1993-09-22$0.75$0.75102,600
1993-09-21$0.71$0.7147,400
1993-09-20$0.75$0.7573,200
1993-09-17$0.79$0.79159,600
1993-09-16$0.83$0.83145,800
1993-09-15$0.75$0.7595,400
1993-09-14$0.75$0.7578,600
1993-09-13$0.75$0.753,600
1993-09-10$0.83$0.8313,800
1993-09-09$0.79$0.79162,600
1993-09-08$0.75$0.7564,800
1993-09-07$0.83$0.83112,800
1993-09-03$0.83$0.8399,000
1993-09-02$0.81$0.8177,400
1993-09-01$0.88$0.88166,800
1993-08-31$0.88$0.882,400
1993-08-30$0.79$0.79106,200
1993-08-27$0.79$0.79385,800
1993-08-26$0.83$0.8366,000
1993-08-25$0.83$0.8326,400
1993-08-24$0.88$0.8869,000
1993-08-23$0.92$0.9210,200
1993-08-20$0.83$0.8355,200
1993-08-19$0.88$0.8867,200
1993-08-18$0.79$0.7932,400
1993-08-17$0.88$0.8834,200
1993-08-16$0.79$0.7990,600
1993-08-13$0.75$0.75280,800
1993-08-12$0.83$0.83331,800
1993-08-11$0.83$0.8337,200
1993-08-10$0.75$0.75271,200
1993-08-09$0.88$0.88139,800
1993-08-06$0.96$0.96407,400
1993-08-05$0.96$0.961,167,600
1993-08-04$0.96$0.963,704,400
1993-08-03$0.79$0.79364,200
1993-08-02$0.63$0.638,400
1993-07-30$0.63$0.6395,400
1993-07-29$0.63$0.63139,800
1993-07-28$0.71$0.71167,400
1993-07-27$0.79$0.7936,000
1993-07-26$0.79$0.79169,800
1993-07-23$0.67$0.67789,600
1993-07-22$0.71$0.71199,200
1993-07-21$0.71$0.7150,400
1993-07-20$0.79$0.79298,200
1993-07-19$0.75$0.75474,000
1993-07-16$0.83$0.8368,400
1993-07-15$0.88$0.88450,000
1993-07-14$0.81$0.81273,000
1993-07-13$0.81$0.8136,000
1993-07-12$0.83$0.83217,800
1993-07-09$0.88$0.88215,400
1993-07-08$0.88$0.8866,600
1993-07-07$0.92$0.9245,000
1993-07-06$0.79$0.79118,800
1993-07-02$0.79$0.797,800
1993-07-01$0.88$0.88148,200
1993-06-30$0.92$0.92317,400
1993-06-29$0.83$0.83769,800
1993-06-28$0.83$0.8320,400
1993-06-25$0.88$0.88459,000
1993-06-24$0.88$0.88165,000
1993-06-23$0.88$0.88293,400
1993-06-22$0.88$0.8833,600
1993-06-21$0.88$0.8831,800
1993-06-18$0.88$0.88166,800
1993-06-17$0.92$0.92475,200
1993-06-16$0.83$0.83543,600
1993-06-15$0.88$0.88363,000
1993-06-14$0.88$0.8834,800
1993-06-11$0.96$0.9669,600
1993-06-10$0.88$0.8818,600
1993-06-09$0.88$0.88448,200
1993-06-08$0.96$0.9630,000
1993-06-07$0.92$0.92158,400
1993-06-04$0.96$0.969,600
1993-06-03$0.92$0.92113,400
1993-06-02$0.88$0.8839,000
1993-06-01$0.88$0.88473,400
1993-05-28$0.94$0.9478,000
1993-05-27$0.92$0.9269,600
1993-05-26$0.92$0.92128,400
1993-05-25$0.96$0.9691,800
1993-05-24$0.88$0.88244,800
1993-05-21$0.92$0.9248,600
1993-05-20$0.92$0.92148,800
1993-05-19$0.96$0.9639,000
1993-05-18$1.04$1.04107,400
1993-05-17$1.08$1.0879,800
1993-05-14$1.13$1.13194,400
1993-05-13$1.04$1.04302,400
1993-05-12$1.08$1.08168,600
1993-05-11$1.08$1.08324,000
1993-05-10$1.04$1.041,291,800
1993-05-07$0.88$0.88833,400
1993-05-06$0.88$0.88196,800
1993-05-05$0.88$0.88231,600
1993-05-04$0.83$0.83600,600
1993-05-03$0.92$0.9267,800
1993-04-30$0.79$0.791,254,000
1993-04-29$0.88$0.88167,400
1993-04-28$0.92$0.92389,400
1993-04-27$0.92$0.92160,200
1993-04-26$0.88$0.8874,400
1993-04-23$0.92$0.9285,800
1993-04-22$0.88$0.88289,800
1993-04-21$0.88$0.88286,200
1993-04-20$0.92$0.92191,400
1993-04-19$0.83$0.8359,400
1993-04-16$0.83$0.8328,800
1993-04-15$0.88$0.8866,600
1993-04-14$0.92$0.92181,200
1993-04-13$0.92$0.9272,000
1993-04-12$0.88$0.88148,200
1993-04-08$0.88$0.8860,600
1993-04-07$0.92$0.9295,400
1993-04-06$0.92$0.9223,400
1993-04-05$0.92$0.92157,200
1993-04-02$1.00$1.0051,600
1993-04-01$0.96$0.96309,000
1993-03-31$0.96$0.9691,200
1993-03-30$0.92$0.92136,200
1993-03-29$0.96$0.96344,400
1993-03-26$0.94$0.9477,400
1993-03-25$0.92$0.9236,600
1993-03-24$1.00$1.0079,200
1993-03-23$0.92$0.9249,200
1993-03-22$0.94$0.94222,600
1993-03-19$1.08$1.0822,200
1993-03-18$1.04$1.04105,000
1993-03-17$1.04$1.0433,600
1993-03-16$1.00$1.0043,800
1993-03-15$1.04$1.04177,600
1993-03-12$1.00$1.0023,400
1993-03-11$1.04$1.04361,200
1993-03-10$1.00$1.0053,400
1993-03-09$1.08$1.08283,200
1993-03-08$1.00$1.00145,800
1993-03-05$1.04$1.04166,800
1993-03-04$1.13$1.1361,200
1993-03-03$1.17$1.1781,000
1993-03-02$1.04$1.0424,000
1993-03-01$1.13$1.1356,400
1993-02-26$1.17$1.17274,800
1993-02-25$1.08$1.08275,400
1993-02-24$1.13$1.13227,400
1993-02-23$1.17$1.17114,600
1993-02-22$1.17$1.17358,200
1993-02-19$1.17$1.17311,400
1993-02-18$1.17$1.1793,600
1993-02-17$1.13$1.13139,200
1993-02-16$1.00$1.00181,200
1993-02-12$1.08$1.08305,400
1993-02-11$1.08$1.08762,600
1993-02-10$1.04$1.04614,400
1993-02-09$1.00$1.00288,600
1993-02-08$1.04$1.04542,400
1993-02-05$1.13$1.1310,800
1993-02-04$1.17$1.17204,000
1993-02-03$1.17$1.17198,600
1993-02-02$1.17$1.17221,400
1993-02-01$1.17$1.17196,200
1993-01-29$1.17$1.1791,800
1993-01-28$1.13$1.1310,200
1993-01-27$1.21$1.21231,000
1993-01-26$1.17$1.17208,200
1993-01-25$1.21$1.21247,800
1993-01-22$1.25$1.25505,800
1993-01-21$1.21$1.21103,200
1993-01-20$1.17$1.17379,200
1993-01-19$1.17$1.17445,200
1993-01-18$1.21$1.2164,200
1993-01-15$1.29$1.2931,800
1993-01-14$1.29$1.29286,800
1993-01-13$1.25$1.25307,200
1993-01-12$1.33$1.33352,200
1993-01-11$1.42$1.4223,400
1993-01-08$1.42$1.42163,200
1993-01-07$1.50$1.50178,800
1993-01-06$1.50$1.5030,600
1993-01-05$1.48$1.4882,800
1993-01-04$1.50$1.50165,600