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 — 2002

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2002-12-31$33.17$33.172,253,000
2002-12-30$33.17$33.171,871,100
2002-12-27$33.62$33.621,927,600
2002-12-26$35.02$35.022,103,800
2002-12-24$35.04$35.04939,800
2002-12-23$35.68$35.683,250,800
2002-12-20$34.35$34.352,700,100
2002-12-19$34.02$34.023,344,100
2002-12-18$34.00$34.004,889,500
2002-12-17$34.39$34.393,946,500
2002-12-16$33.93$33.934,735,900
2002-12-13$33.43$33.433,562,800
2002-12-12$34.84$34.843,096,500
2002-12-11$34.21$34.212,430,600
2002-12-10$34.13$34.134,631,100
2002-12-09$33.32$33.326,357,000
2002-12-06$32.61$32.615,484,900
2002-12-05$32.82$32.824,445,800
2002-12-04$32.29$32.295,172,800
2002-12-03$32.29$32.298,925,000
2002-12-02$33.45$33.455,059,300
2002-11-29$32.81$32.811,554,100
2002-11-27$33.14$33.147,581,900
2002-11-26$32.84$32.8417,060,600
2002-11-25$36.24$36.249,175,000
2002-11-22$39.37$39.373,148,300
2002-11-21$40.36$40.365,812,800
2002-11-20$38.54$38.545,582,000
2002-11-19$38.24$38.245,314,900
2002-11-18$39.34$39.344,341,900
2002-11-15$40.36$40.364,650,800
2002-11-14$42.20$42.203,182,000
2002-11-13$42.18$42.184,867,100
2002-11-12$42.36$42.363,261,000
2002-11-11$42.14$42.142,204,300
2002-11-08$42.19$42.193,215,000
2002-11-07$43.68$43.683,429,800
2002-11-06$45.59$45.594,743,100
2002-11-05$46.30$46.304,871,400
2002-11-04$46.34$46.343,043,400
2002-11-01$46.57$46.573,561,600
2002-10-31$46.02$46.024,720,600
2002-10-30$44.66$44.664,546,000
2002-10-29$43.21$43.212,443,300
2002-10-28$43.95$43.952,765,100
2002-10-25$44.26$44.263,033,200
2002-10-24$42.49$42.492,453,800
2002-10-23$44.40$44.403,092,800
2002-10-22$44.24$44.245,037,900
2002-10-21$46.13$46.135,868,500
2002-10-18$43.42$43.424,520,900
2002-10-17$43.73$43.736,474,900
2002-10-16$40.42$40.425,244,800
2002-10-15$41.46$41.466,267,900
2002-10-14$39.21$39.213,776,500
2002-10-11$38.67$38.674,570,200
2002-10-10$38.60$38.607,152,400
2002-10-09$36.42$36.427,288,200
2002-10-08$37.60$37.604,773,000
2002-10-07$37.55$37.554,856,200
2002-10-04$36.40$36.408,587,900
2002-10-03$39.30$39.304,451,400
2002-10-02$40.71$40.716,547,300
2002-10-01$41.66$41.6610,080,500
2002-09-30$41.52$41.526,735,700
2002-09-27$42.22$42.227,311,400
2002-09-26$42.49$42.496,173,100
2002-09-25$42.34$42.346,278,000
2002-09-24$39.65$39.655,335,400
2002-09-23$38.40$38.405,535,700
2002-09-20$40.03$40.0310,847,000
2002-09-19$41.30$41.309,578,700
2002-09-18$44.24$44.243,673,500
2002-09-17$44.03$44.034,539,000
2002-09-16$43.70$43.702,681,200
2002-09-13$43.63$43.634,301,300
2002-09-12$41.79$41.793,217,400
2002-09-11$43.64$43.642,889,100
2002-09-10$43.33$43.334,262,800
2002-09-09$42.10$42.103,600,200
2002-09-06$40.71$40.713,600,700
2002-09-05$39.10$39.105,144,100
2002-09-04$40.87$40.873,729,900
2002-09-03$38.99$38.995,783,000
2002-08-30$40.18$40.182,913,500
2002-08-29$41.83$41.834,055,300
2002-08-28$41.41$41.413,738,400
2002-08-27$41.30$41.304,316,600
2002-08-26$42.08$42.085,863,700
2002-08-23$43.27$43.275,196,700
2002-08-22$46.77$46.773,857,200
2002-08-21$45.13$45.132,812,300
2002-08-20$43.71$43.713,306,700
2002-08-19$44.33$44.333,524,300
2002-08-16$45.30$45.302,614,900
2002-08-15$45.84$45.844,830,100
2002-08-14$45.76$45.765,031,800
2002-08-13$43.89$43.895,056,300
2002-08-12$46.28$46.282,688,400
2002-08-09$45.87$45.875,149,400
2002-08-08$44.85$44.856,040,900
2002-08-07$42.61$42.614,056,400
2002-08-06$41.63$41.634,742,500
2002-08-05$40.35$40.354,198,600
2002-08-02$41.75$41.754,617,100
2002-08-01$42.67$42.673,737,700
2002-07-31$44.59$44.595,265,500
2002-07-30$44.00$44.006,512,600
2002-07-29$42.29$42.295,399,700
2002-07-26$39.50$39.504,779,300
2002-07-25$40.56$40.566,927,500
2002-07-24$39.99$39.996,598,100
2002-07-23$37.59$37.595,945,700
2002-07-22$38.20$38.205,580,900
2002-07-19$38.78$38.785,409,100
2002-07-18$40.73$40.736,495,100
2002-07-17$41.56$41.569,943,100
2002-07-16$38.91$38.917,975,500
2002-07-15$36.96$36.965,486,200
2002-07-12$36.26$36.268,311,600
2002-07-11$33.93$33.938,937,900
2002-07-10$30.15$30.155,310,500
2002-07-09$32.81$32.813,345,900
2002-07-08$34.57$34.573,527,800
2002-07-05$34.97$34.971,477,900
2002-07-03$33.45$33.455,041,700
2002-07-02$31.60$31.6013,752,000
2002-07-01$32.60$32.604,954,400
2002-06-28$35.45$35.453,750,500
2002-06-27$36.30$36.304,745,600
2002-06-26$35.91$35.916,446,000
2002-06-25$33.86$33.864,751,500
2002-06-24$34.46$34.466,091,600
2002-06-21$32.61$32.615,070,000
2002-06-20$33.98$33.984,842,000
2002-06-19$35.95$35.955,917,400
2002-06-18$36.27$36.273,983,900
2002-06-17$37.67$37.675,545,400
2002-06-14$35.13$35.137,265,600
2002-06-13$33.00$33.006,853,800
2002-06-12$31.84$31.849,105,900
2002-06-11$32.03$32.0321,053,000
2002-06-10$38.37$38.375,005,400
2002-06-07$38.24$38.246,726,600
2002-06-06$37.50$37.507,610,300
2002-06-05$38.90$38.905,445,400
2002-06-04$38.10$38.107,715,000
2002-06-03$39.76$39.764,885,000
2002-05-31$42.89$42.893,400,600
2002-05-30$44.40$44.403,224,400
2002-05-29$43.65$43.653,385,200
2002-05-28$45.25$45.253,823,200
2002-05-24$44.44$44.445,213,200
2002-05-23$47.30$47.305,203,800
2002-05-22$43.69$43.694,143,600
2002-05-21$42.21$42.216,036,100
2002-05-20$45.21$45.213,759,600
2002-05-17$47.93$47.934,801,600
2002-05-16$45.61$45.614,177,900
2002-05-15$47.62$47.627,875,500
2002-05-14$45.95$45.9514,860,000
2002-05-13$44.60$44.607,130,800
2002-05-10$45.99$45.998,209,300
2002-05-09$49.11$49.113,845,100
2002-05-08$52.05$52.056,059,400
2002-05-07$47.57$47.575,617,500
2002-05-06$47.50$47.505,726,000
2002-05-03$50.87$50.877,724,600
2002-05-02$52.51$52.513,716,700
2002-05-01$54.25$54.254,088,500
2002-04-30$54.95$54.958,395,600
2002-04-29$52.52$52.525,625,100
2002-04-26$54.65$54.655,433,100
2002-04-25$56.73$56.734,678,800
2002-04-24$58.33$58.3312,542,400
2002-04-23$61.15$61.153,049,600
2002-04-22$62.83$62.833,011,500
2002-04-19$62.73$62.733,087,000
2002-04-18$64.00$64.003,310,700
2002-04-17$61.00$61.002,191,100
2002-04-16$61.52$61.523,052,300
2002-04-15$61.65$61.652,825,300
2002-04-12$60.18$60.183,645,800
2002-04-11$59.37$59.374,823,000
2002-04-10$61.70$61.708,881,200
2002-04-09$57.94$57.943,590,400
2002-04-08$59.78$59.784,944,200
2002-04-05$60.04$60.048,174,100
2002-04-04$60.93$60.935,481,000
2002-04-03$63.19$63.194,606,400
2002-04-02$64.78$64.784,217,200
2002-04-01$65.55$65.553,682,700
2002-03-28$64.30$64.305,280,300
2002-03-27$67.73$67.732,618,600
2002-03-26$67.99$67.993,102,800
2002-03-25$67.15$67.153,207,100
2002-03-22$69.20$69.202,035,600
2002-03-21$70.18$70.183,249,500
2002-03-20$67.62$67.622,649,800
2002-03-19$70.34$70.341,910,100
2002-03-18$70.96$70.964,333,800
2002-03-15$69.93$69.932,797,200
2002-03-14$68.22$68.222,799,700
2002-03-13$69.31$69.314,668,100
2002-03-12$66.38$66.382,118,000
2002-03-11$66.16$66.163,077,500
2002-03-08$67.59$67.592,696,200
2002-03-07$67.44$67.442,220,000
2002-03-06$68.97$68.973,665,400
2002-03-05$65.73$65.733,504,400
2002-03-04$67.56$67.563,006,400
2002-03-01$65.24$65.243,479,200
2002-02-28$62.82$62.823,304,800
2002-02-27$63.42$63.423,230,800
2002-02-26$64.12$64.123,624,900
2002-02-25$63.06$63.063,583,400
2002-02-22$62.06$62.063,105,300
2002-02-21$60.92$60.924,800,200
2002-02-20$62.10$62.108,544,300
2002-02-19$56.01$56.012,351,100
2002-02-15$58.99$58.992,564,200
2002-02-14$57.83$57.832,821,100
2002-02-13$59.38$59.384,235,400
2002-02-12$59.80$59.805,612,900
2002-02-11$56.58$56.584,077,700
2002-02-08$57.39$57.394,198,300
2002-02-07$51.95$51.956,537,800
2002-02-06$53.30$53.303,657,900
2002-02-05$55.40$55.404,457,500
2002-02-04$55.49$55.493,756,700
2002-02-01$58.94$58.944,056,700
2002-01-31$59.46$59.464,063,400
2002-01-30$57.85$57.859,049,900
2002-01-29$59.51$59.513,951,000
2002-01-28$61.56$61.562,053,100
2002-01-25$63.49$63.492,129,700
2002-01-24$64.23$64.234,422,000
2002-01-23$65.06$65.064,241,200
2002-01-22$61.74$61.743,894,700
2002-01-18$60.63$60.634,097,600
2002-01-17$62.07$62.075,079,600
2002-01-16$62.41$62.413,177,000
2002-01-15$63.60$63.602,756,900
2002-01-14$64.05$64.052,578,500
2002-01-11$65.89$65.892,657,100
2002-01-10$64.92$64.923,534,600
2002-01-09$63.21$63.214,151,400
2002-01-08$64.26$64.267,158,900
2002-01-07$62.31$62.314,623,700
2002-01-04$64.77$64.778,976,500
2002-01-03$63.94$63.947,838,600
2002-01-02$68.15$68.154,295,700