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.

View year

Historical Stock Price — 1996

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
1996-12-31$3.96$3.96642,600
1996-12-30$3.94$3.94960,000
1996-12-27$4.10$4.102,830,800
1996-12-26$3.92$3.92967,800
1996-12-24$3.71$3.71949,800
1996-12-23$3.65$3.651,265,400
1996-12-20$3.69$3.692,121,000
1996-12-19$3.56$3.56974,400
1996-12-18$3.44$3.442,811,600
1996-12-17$3.27$3.272,318,400
1996-12-16$3.38$3.381,299,000
1996-12-13$3.50$3.501,968,600
1996-12-12$3.42$3.422,142,000
1996-12-11$3.56$3.562,812,800
1996-12-10$3.71$3.711,976,400
1996-12-09$3.94$3.942,660,400
1996-12-06$4.10$4.101,971,000
1996-12-05$4.31$4.314,107,000
1996-12-04$4.05$4.053,880,200
1996-12-03$4.17$4.174,845,000
1996-12-02$4.09$4.093,834,000
1996-11-29$4.04$4.04718,800
1996-11-27$3.92$3.92679,800
1996-11-26$3.81$3.81999,000
1996-11-25$3.71$3.71239,400
1996-11-22$3.67$3.67862,800
1996-11-21$3.60$3.602,499,600
1996-11-20$3.39$3.39336,600
1996-11-19$3.46$3.46937,800
1996-11-18$3.35$3.35388,800
1996-11-15$3.33$3.33957,600
1996-11-14$3.50$3.501,782,600
1996-11-13$3.40$3.401,947,600
1996-11-12$3.06$3.06563,400
1996-11-11$3.10$3.101,505,400
1996-11-08$3.10$3.10915,000
1996-11-07$3.23$3.231,454,400
1996-11-06$3.17$3.171,599,600
1996-11-05$3.15$3.151,995,000
1996-11-04$3.33$3.331,248,600
1996-11-01$3.58$3.58919,200
1996-10-31$3.60$3.601,395,000
1996-10-30$3.46$3.461,252,200
1996-10-29$3.60$3.60832,200
1996-10-28$3.67$3.671,224,600
1996-10-25$3.71$3.71422,400
1996-10-24$3.75$3.751,462,800
1996-10-23$3.90$3.901,066,800
1996-10-22$3.79$3.793,188,400
1996-10-21$3.73$3.732,534,400
1996-10-18$4.10$4.101,106,400
1996-10-17$4.08$4.08966,000
1996-10-16$4.04$4.04627,000
1996-10-15$4.10$4.10622,200
1996-10-14$4.31$4.311,083,600
1996-10-11$4.17$4.17683,400
1996-10-10$3.98$3.98832,200
1996-10-09$3.85$3.85751,200
1996-10-08$3.96$3.96658,200
1996-10-07$4.08$4.08514,800
1996-10-04$4.17$4.171,687,800
1996-10-03$3.96$3.96648,600
1996-10-02$4.00$4.00640,200
1996-10-01$4.19$4.191,417,800
1996-09-30$4.00$4.00921,600
1996-09-27$4.20$4.201,758,600
1996-09-26$4.52$4.522,393,400
1996-09-25$4.17$4.17606,600
1996-09-24$4.10$4.102,101,200
1996-09-23$3.94$3.94603,600
1996-09-20$4.02$4.02733,800
1996-09-19$4.13$4.13616,200
1996-09-18$4.14$4.14837,600
1996-09-17$4.31$4.312,580,600
1996-09-16$4.40$4.402,004,000
1996-09-13$4.31$4.313,833,400
1996-09-12$3.81$3.81310,800
1996-09-11$3.83$3.83870,000
1996-09-10$3.85$3.851,472,400
1996-09-09$3.98$3.982,048,400
1996-09-06$3.83$3.83395,400
1996-09-05$3.82$3.82295,200
1996-09-04$3.85$3.85751,800
1996-09-03$3.85$3.851,085,400
1996-08-30$3.90$3.90533,400
1996-08-29$3.90$3.901,932,600
1996-08-28$4.00$4.001,754,400
1996-08-27$3.67$3.67670,200
1996-08-26$3.66$3.661,100,400
1996-08-23$3.60$3.601,159,200
1996-08-22$3.67$3.671,631,400
1996-08-21$3.73$3.731,509,600
1996-08-20$3.65$3.651,050,600
1996-08-19$3.54$3.541,358,400
1996-08-16$3.31$3.31570,000
1996-08-15$3.15$3.15215,400
1996-08-14$3.23$3.23725,400
1996-08-13$3.27$3.271,557,000
1996-08-12$3.19$3.192,594,400
1996-08-09$2.90$2.901,005,000
1996-08-08$2.90$2.90456,600
1996-08-07$2.92$2.92540,600
1996-08-06$3.02$3.021,951,200
1996-08-05$2.92$2.921,624,800
1996-08-02$2.77$2.774,489,200
1996-08-01$2.52$2.521,461,600
1996-07-31$2.58$2.581,035,600
1996-07-30$2.63$2.631,571,400
1996-07-29$2.56$2.563,031,200
1996-07-26$2.67$2.671,552,800
1996-07-25$2.65$2.651,480,800
1996-07-24$2.44$2.442,502,600
1996-07-23$2.52$2.522,905,200
1996-07-22$2.81$2.81713,400
1996-07-19$3.00$3.00913,800
1996-07-18$3.10$3.101,971,600
1996-07-17$3.06$3.063,389,400
1996-07-16$2.85$2.853,057,000
1996-07-15$3.00$3.001,821,000
1996-07-12$3.19$3.193,036,600
1996-07-11$3.06$3.063,517,200
1996-07-10$3.27$3.272,471,400
1996-07-09$3.48$3.486,677,400
1996-07-08$3.29$3.294,914,000
1996-07-05$3.02$3.021,419,000
1996-07-03$3.56$3.56909,000
1996-07-02$3.73$3.73736,800
1996-07-01$3.96$3.961,079,400
1996-06-28$3.85$3.852,315,400
1996-06-27$3.63$3.631,107,000
1996-06-26$3.58$3.581,533,000
1996-06-25$3.92$3.92950,400
1996-06-24$3.85$3.85585,000
1996-06-21$3.79$3.79492,000
1996-06-20$3.75$3.751,552,800
1996-06-19$3.81$3.812,838,600
1996-06-18$3.96$3.961,383,600
1996-06-17$4.04$4.041,336,800
1996-06-14$4.15$4.15992,400
1996-06-13$4.10$4.10871,200
1996-06-12$4.10$4.10838,200
1996-06-11$4.08$4.08734,400
1996-06-10$4.06$4.062,058,000
1996-06-07$3.98$3.988,018,400
1996-06-06$4.04$4.041,021,800
1996-06-05$4.17$4.171,639,800
1996-06-04$4.06$4.06612,000
1996-06-03$4.19$4.19644,400
1996-05-31$4.29$4.29379,200
1996-05-30$4.33$4.331,032,000
1996-05-29$4.31$4.311,311,600
1996-05-28$4.23$4.232,581,800
1996-05-24$4.69$4.69413,400
1996-05-23$4.69$4.691,146,600
1996-05-22$4.92$4.921,846,800
1996-05-21$4.94$4.944,318,200
1996-05-20$5.02$5.021,974,000
1996-05-17$5.02$5.021,480,200
1996-05-16$4.96$4.961,457,400
1996-05-15$4.85$4.85809,400
1996-05-14$4.96$4.961,139,400
1996-05-13$5.02$5.021,086,600
1996-05-10$5.00$5.002,406,000
1996-05-09$4.90$4.901,333,200
1996-05-08$4.73$4.731,051,800
1996-05-07$4.73$4.731,089,600
1996-05-06$4.58$4.581,398,600
1996-05-03$4.52$4.521,558,200
1996-05-02$4.67$4.67606,600
1996-05-01$4.86$4.86835,800
1996-04-30$4.81$4.81504,000
1996-04-29$4.77$4.771,191,600
1996-04-26$4.75$4.751,567,800
1996-04-25$4.98$4.983,154,200
1996-04-24$4.35$4.351,621,800
1996-04-23$4.40$4.40806,400
1996-04-22$4.35$4.35555,600
1996-04-19$4.33$4.331,233,000
1996-04-18$4.27$4.27762,000
1996-04-17$4.08$4.082,200,800
1996-04-16$4.19$4.19528,000
1996-04-15$4.33$4.33790,800
1996-04-12$4.33$4.33453,600
1996-04-11$4.31$4.31926,400
1996-04-10$4.35$4.35770,400
1996-04-09$4.35$4.351,243,200
1996-04-08$4.27$4.272,304,600
1996-04-04$4.56$4.566,280,200
1996-04-03$4.38$4.382,245,200
1996-04-02$4.17$4.171,968,600
1996-04-01$4.06$4.064,617,600
1996-03-29$3.71$3.711,304,400
1996-03-28$3.50$3.501,097,400
1996-03-27$3.44$3.441,503,000
1996-03-26$3.38$3.381,867,200
1996-03-25$3.29$3.291,258,200
1996-03-22$3.35$3.35999,600
1996-03-21$3.36$3.361,923,600
1996-03-20$3.19$3.191,071,600
1996-03-19$3.27$3.273,133,800
1996-03-18$3.41$3.412,268,600
1996-03-15$3.58$3.581,159,800
1996-03-14$3.77$3.774,285,200
1996-03-13$3.52$3.527,495,200
1996-03-12$2.78$2.781,920,000
1996-03-11$2.85$2.851,768,800
1996-03-08$2.83$2.831,744,200
1996-03-07$3.02$3.022,572,200
1996-03-06$3.16$3.16684,000
1996-03-05$3.29$3.29703,800
1996-03-04$3.26$3.26640,800
1996-03-01$3.27$3.27789,600
1996-02-29$3.38$3.38823,800
1996-02-28$3.46$3.461,519,200
1996-02-27$3.46$3.46250,800
1996-02-26$3.50$3.50752,400
1996-02-23$3.44$3.44699,600
1996-02-22$3.42$3.421,140,000
1996-02-21$3.27$3.27508,800
1996-02-20$3.21$3.211,768,800
1996-02-16$3.50$3.501,152,600
1996-02-15$3.29$3.291,102,200
1996-02-14$3.35$3.351,093,800
1996-02-13$3.46$3.46462,600
1996-02-12$3.48$3.48376,200
1996-02-09$3.56$3.561,167,000
1996-02-08$3.48$3.48206,400
1996-02-07$3.46$3.46371,400
1996-02-06$3.50$3.50703,200
1996-02-05$3.56$3.56598,800
1996-02-02$3.71$3.71946,800
1996-02-01$3.73$3.731,618,200
1996-01-31$3.58$3.581,210,800
1996-01-30$3.58$3.582,586,600
1996-01-29$3.71$3.713,195,000
1996-01-26$3.44$3.441,191,000
1996-01-25$3.50$3.504,792,200
1996-01-24$3.35$3.352,976,000
1996-01-23$3.23$3.231,581,600
1996-01-22$3.21$3.21814,800
1996-01-19$3.23$3.231,108,800
1996-01-18$3.31$3.311,839,600
1996-01-17$3.48$3.482,977,200
1996-01-16$3.60$3.604,023,600
1996-01-15$3.25$3.25645,600
1996-01-12$3.21$3.211,396,800
1996-01-11$3.25$3.252,542,800
1996-01-10$2.96$2.962,293,800
1996-01-09$3.21$3.211,407,600
1996-01-08$3.21$3.21447,600
1996-01-05$3.19$3.19721,200
1996-01-04$3.21$3.212,769,000
1996-01-03$3.40$3.402,783,400
1996-01-02$3.19$3.191,911,600