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 — 1992

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
1992-12-31$1.46$1.46163,200——
1992-12-30$1.50$1.50292,200——
1992-12-29$1.58$1.58204,000——
1992-12-28$1.69$1.69103,800——
1992-12-24$1.67$1.6736,000——
1992-12-23$1.67$1.67136,200——
1992-12-22$1.67$1.67226,800——
1992-12-21$1.83$1.8346,800——
1992-12-18$1.77$1.77144,000——
1992-12-17$1.75$1.75448,800——
1992-12-16$1.71$1.71324,000——
1992-12-15$1.79$1.79148,200——
1992-12-14$1.79$1.79132,000——
1992-12-11$1.83$1.83102,600——
1992-12-10$1.79$1.79505,200——
1992-12-09$1.79$1.79459,600——
1992-12-08$1.81$1.81360,600——
1992-12-07$1.79$1.7946,800——
1992-12-04$1.88$1.8849,800——
1992-12-03$1.83$1.83253,800——
1992-12-02$1.88$1.88580,800——
1992-12-01$1.75$1.75179,400——
1992-11-30$1.75$1.75319,200——
1992-11-27$1.75$1.7519,800——
1992-11-25$1.71$1.71202,800——
1992-11-24$1.73$1.73400,800——
1992-11-23$1.71$1.71339,600——
1992-11-20$1.67$1.67135,600——
1992-11-19$1.63$1.63479,400——
1992-11-18$1.71$1.71450,000——
1992-11-17$1.63$1.63163,800——
1992-11-16$1.63$1.63371,400——
1992-11-13$1.71$1.71298,200——
1992-11-12$1.71$1.71309,000——
1992-11-11$1.75$1.75439,200——
1992-11-10$1.63$1.63168,000——
1992-11-09$1.63$1.63118,800——
1992-11-06$1.63$1.63355,200——
1992-11-05$1.60$1.60163,200——
1992-11-04$1.58$1.58235,200——
1992-11-03$1.67$1.67276,000——
1992-11-02$1.65$1.65202,200——
1992-10-30$1.58$1.58261,600——
1992-10-29$1.54$1.54615,600——
1992-10-28$1.54$1.54208,800——
1992-10-27$1.63$1.63294,000——
1992-10-26$1.58$1.581,793,400——
1992-10-23$1.54$1.54289,200——
1992-10-22$1.50$1.50195,000——
1992-10-21$1.46$1.46345,600——
1992-10-20$1.29$1.29555,000——
1992-10-19$1.42$1.42646,800——
1992-10-16$1.29$1.29153,600——
1992-10-15$1.29$1.29572,400——
1992-10-14$1.38$1.38915,000——
1992-10-13$1.21$1.21226,200——
1992-10-12$1.08$1.0867,200——
1992-10-09$1.17$1.1742,000——
1992-10-08$1.15$1.15130,800——
1992-10-07$1.08$1.0873,800——
1992-10-06$1.13$1.13228,000——
1992-10-05$1.08$1.08136,800——
1992-10-02$1.04$1.04273,600——
1992-10-01$1.13$1.1346,200——
1992-09-30$1.08$1.0816,200——
1992-09-29$1.08$1.08137,400——
1992-09-28$1.13$1.1344,400——
1992-09-25$1.15$1.15999,000——
1992-09-24$1.15$1.15117,000——
1992-09-23$1.13$1.1352,200——
1992-09-22$1.13$1.13211,800——
1992-09-21$1.13$1.13148,200——
1992-09-18$1.17$1.178,400——
1992-09-17$1.17$1.1743,800——
1992-09-16$1.17$1.17113,400——
1992-09-15$1.17$1.17232,800——
1992-09-14$1.21$1.21206,400——
1992-09-11$1.21$1.2143,200——
1992-09-10$1.21$1.21304,800——
1992-09-09$1.17$1.17103,200——
1992-09-08$1.08$1.089,000——
1992-09-04$1.17$1.1711,400——
1992-09-03$1.17$1.17216,000——
1992-09-02$1.21$1.21218,400——
1992-09-01$1.13$1.13185,400——
1992-08-31$1.19$1.1971,400——
1992-08-28$1.13$1.1336,000——
1992-08-27$1.13$1.13364,800——
1992-08-26$1.15$1.15166,800——
1992-08-25$1.08$1.08328,800——
1992-08-24$1.10$1.10344,400——
1992-08-21$1.17$1.17101,400——
1992-08-20$1.21$1.21230,400——
1992-08-19$1.38$1.3825,200——
1992-08-18$1.33$1.3334,200——
1992-08-17$1.33$1.3376,800——
1992-08-14$1.42$1.4212,600——
1992-08-13$1.33$1.33278,400——
1992-08-12$1.42$1.4270,200——
1992-08-11$1.42$1.42103,800——
1992-08-10$1.38$1.3894,800——
1992-08-07$1.44$1.4469,600——
1992-08-06$1.46$1.4671,400——
1992-08-05$1.33$1.33166,800——
1992-08-04$1.38$1.38133,200——
1992-08-03$1.42$1.42105,600——
1992-07-31$1.42$1.42147,000——
1992-07-30$1.42$1.421,003,200——
1992-07-29$1.33$1.33463,200——
1992-07-28$1.29$1.29323,400——
1992-07-27$1.33$1.331,045,800——
1992-07-24$1.17$1.1767,200——
1992-07-23$1.17$1.17107,400——
1992-07-22$1.19$1.19123,600——
1992-07-21$1.25$1.2566,000——
1992-07-20$1.25$1.2568,400——
1992-07-17$1.25$1.2539,000——
1992-07-16$1.25$1.25176,400——
1992-07-15$1.29$1.2924,000——
1992-07-14$1.33$1.33115,200——
1992-07-13$1.33$1.33352,200——
1992-07-10$1.44$1.44168,000——
1992-07-09$1.50$1.50340,200——
1992-07-08$1.29$1.29204,600——
1992-07-07$1.29$1.29359,400——
1992-07-06$1.33$1.33623,400——
1992-07-02$1.15$1.15213,000——
1992-07-01$1.17$1.171,082,400——
1992-06-30$1.10$1.10222,000——
1992-06-29$1.17$1.17136,800——
1992-06-26$1.13$1.13477,000——
1992-06-25$1.19$1.1981,000——
1992-06-24$1.13$1.13235,200——
1992-06-23$1.17$1.1792,400——
1992-06-22$1.25$1.2554,600——
1992-06-19$1.25$1.25437,400——
1992-06-18$1.19$1.19336,600——
1992-06-17$1.25$1.2585,200——
1992-06-16$1.25$1.2572,000——
1992-06-15$1.33$1.33289,200——
1992-06-12$1.38$1.38312,000——
1992-06-11$1.35$1.35243,000——
1992-06-10$1.29$1.29137,400——
1992-06-09$1.33$1.3397,800——
1992-06-08$1.38$1.3867,800——
1992-06-05$1.35$1.351,586,400——
1992-06-04$1.42$1.4239,600——
1992-06-03$1.33$1.33199,800——
1992-06-02$1.42$1.42225,000——
1992-06-01$1.38$1.38229,200——
1992-05-29$1.33$1.33286,800——
1992-05-28$1.29$1.29358,800——
1992-05-27$1.21$1.21300,600——
1992-05-26$1.04$1.04121,200——
1992-05-22$1.10$1.10460,800——
1992-05-21$1.17$1.17609,600——
1992-05-20$1.17$1.171,755,000——
1992-05-19$1.17$1.17186,600——
1992-05-18$1.10$1.10182,400——
1992-05-15$1.08$1.08773,400——
1992-05-14$1.13$1.1357,000——
1992-05-13$1.21$1.211,212,600——
1992-05-12$1.21$1.21252,000——
1992-05-11$1.17$1.1767,800——
1992-05-08$1.17$1.1721,000——
1992-05-07$1.25$1.25223,200——
1992-05-06$1.23$1.23277,800——
1992-05-05$1.42$1.4256,400——
1992-05-04$1.29$1.2982,800——
1992-05-01$1.38$1.3835,400——
1992-04-30$1.33$1.3318,000——
1992-04-29$1.21$1.21201,000——
1992-04-28$1.33$1.3374,400——
1992-04-27$1.33$1.33100,800——
1992-04-24$1.38$1.3814,400——
1992-04-23$1.38$1.381,675,800——
1992-04-22$1.33$1.33151,200——
1992-04-21$1.33$1.33444,000——
1992-04-20$1.13$1.13417,000——
1992-04-16$1.33$1.33184,200——
1992-04-15$1.38$1.38106,200——
1992-04-14$1.46$1.4654,000——
1992-04-13$1.50$1.5049,200——
1992-04-10$1.50$1.50353,400——
1992-04-09$1.46$1.46349,800——
1992-04-08$1.29$1.29706,800——
1992-04-07$1.27$1.271,153,200——
1992-04-06$1.58$1.58612,600——
1992-04-03$1.88$1.88105,000——
1992-04-02$1.83$1.8322,200——
1992-04-01$1.79$1.79129,000——
1992-03-31$1.83$1.83122,400——
1992-03-30$1.92$1.9278,000——
1992-03-27$1.90$1.90107,400——
1992-03-26$1.92$1.92140,400——
1992-03-25$1.83$1.83153,600——
1992-03-24$1.92$1.9236,000——
1992-03-23$1.88$1.8832,400——
1992-03-20$1.88$1.8851,000——
1992-03-19$1.88$1.8854,000——
1992-03-18$1.88$1.882,891,400——
1992-03-17$1.96$1.96663,000——
1992-03-16$1.92$1.92951,000——
1992-03-13$2.00$2.00216,600——
1992-03-12$2.13$2.13171,600——
1992-03-11$2.08$2.08201,000——
1992-03-10$2.17$2.1781,600——
1992-03-09$2.13$2.13327,600——
1992-03-06$2.17$2.17675,600——
1992-03-05$2.25$2.25678,600——
1992-03-04$2.33$2.3332,400——
1992-03-03$2.25$2.25238,800——
1992-03-02$2.29$2.2988,800——
1992-02-28$2.33$2.3360,600——
1992-02-27$2.21$2.2172,600——
1992-02-26$2.38$2.38210,600——
1992-02-25$2.21$2.2185,200——
1992-02-24$2.29$2.29265,200——
1992-02-21$2.27$2.2791,200——
1992-02-20$2.25$2.25130,200——
1992-02-19$2.08$2.08547,800——
1992-02-18$2.13$2.13320,400——
1992-02-14$2.29$2.29241,200——
1992-02-13$2.46$2.46985,200——
1992-02-12$2.21$2.213,684,600——
1992-02-11$2.29$2.29266,400——
1992-02-10$2.33$2.33353,400——
1992-02-07$2.50$2.5091,800——
1992-02-06$2.58$2.58171,000——
1992-02-05$2.58$2.58226,200——
1992-02-04$2.50$2.50183,000——
1992-02-03$2.56$2.56173,400——
1992-01-31$2.58$2.58174,000——
1992-01-30$2.63$2.6338,400——
1992-01-29$2.58$2.58516,000——
1992-01-28$2.67$2.6783,400——
1992-01-27$2.63$2.63123,000——
1992-01-24$2.79$2.79235,200——
1992-01-23$2.79$2.79402,000——
1992-01-22$2.79$2.79524,400——
1992-01-21$2.73$2.73280,800——
1992-01-20$2.83$2.83339,600——
1992-01-17$3.08$3.08621,600——
1992-01-16$3.17$3.172,738,400——
1992-01-15$2.96$2.96451,800——
1992-01-14$3.33$3.331,238,400——
1992-01-13$3.08$3.08307,200——
1992-01-10$3.04$3.04700,200——
1992-01-09$3.21$3.211,472,400——
1992-01-08$3.25$3.252,019,600——
1992-01-07$2.75$2.75786,600——
1992-01-06$2.58$2.58708,000——
1992-01-03$2.31$2.31951,000——
1992-01-02$2.13$2.13659,400——