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 — 2004

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2004-12-31$66.61$66.611,722,900——
2004-12-30$67.21$67.211,225,200——
2004-12-29$67.92$67.922,247,300——
2004-12-28$67.86$67.863,842,300——
2004-12-27$65.55$65.552,944,000——
2004-12-23$66.31$66.312,021,200——
2004-12-22$65.64$65.642,122,800——
2004-12-21$65.92$65.922,535,300——
2004-12-20$65.84$65.842,576,400——
2004-12-17$64.80$64.804,309,000——
2004-12-16$65.89$65.893,414,300——
2004-12-15$64.91$64.913,591,400——
2004-12-14$66.19$66.193,194,800——
2004-12-13$66.29$66.294,167,800——
2004-12-10$65.53$65.534,408,200——
2004-12-09$66.12$66.126,323,300——
2004-12-08$64.53$64.538,194,000——
2004-12-07$61.47$61.473,545,400——
2004-12-06$61.39$61.392,226,200——
2004-12-03$61.56$61.563,301,000——
2004-12-02$61.90$61.903,457,900——
2004-12-01$60.56$60.565,814,400——
2004-11-30$58.68$58.683,786,300——
2004-11-29$58.90$58.904,268,300——
2004-11-26$58.43$58.431,101,400——
2004-11-24$58.59$58.599,389,100——
2004-11-23$57.43$57.436,814,000——
2004-11-22$57.14$57.146,481,600——
2004-11-19$55.34$55.346,831,700——
2004-11-18$57.52$57.522,835,300——
2004-11-17$57.06$57.063,894,100——
2004-11-16$58.31$58.312,097,500——
2004-11-15$58.75$58.752,525,400——
2004-11-12$59.04$59.044,994,900——
2004-11-11$60.12$60.122,714,400——
2004-11-10$59.64$59.642,667,400——
2004-11-09$60.50$60.504,390,200——
2004-11-08$60.40$60.405,401,500——
2004-11-05$60.86$60.865,017,900——
2004-11-04$59.90$59.905,039,700——
2004-11-03$60.29$60.294,822,500——
2004-11-02$57.08$57.083,690,200——
2004-11-01$57.65$57.654,095,200——
2004-10-29$58.16$58.164,939,700——
2004-10-28$59.61$59.614,834,900——
2004-10-27$58.52$58.524,565,100——
2004-10-26$56.68$56.683,576,500——
2004-10-25$55.80$55.803,067,700——
2004-10-22$56.78$56.782,679,200——
2004-10-21$58.27$58.272,322,300——
2004-10-20$58.07$58.072,590,500——
2004-10-19$57.06$57.061,975,600——
2004-10-18$58.00$58.002,922,900——
2004-10-15$58.02$58.023,970,900——
2004-10-14$56.88$56.885,572,500——
2004-10-13$57.89$57.893,356,700——
2004-10-12$59.82$59.822,289,900——
2004-10-11$60.26$60.263,580,200——
2004-10-08$58.95$58.956,669,700——
2004-10-07$60.15$60.153,143,600——
2004-10-06$62.30$62.302,553,300——
2004-10-05$61.88$61.882,497,900——
2004-10-04$62.44$62.443,005,100——
2004-10-01$62.87$62.873,052,900——
2004-09-30$61.17$61.172,940,900——
2004-09-29$60.72$60.722,071,300——
2004-09-28$60.01$60.012,287,000——
2004-09-27$59.28$59.282,238,000——
2004-09-24$59.67$59.672,163,800——
2004-09-23$59.31$59.312,622,800——
2004-09-22$59.57$59.573,090,400——
2004-09-21$61.52$61.523,164,600——
2004-09-20$61.54$61.542,817,600——
2004-09-17$61.72$61.722,098,400——
2004-09-16$61.05$61.052,486,700——
2004-09-15$61.40$61.402,123,200——
2004-09-14$62.31$62.312,008,100——
2004-09-13$62.25$62.252,358,500——
2004-09-10$62.09$62.092,290,800——
2004-09-09$61.36$61.362,693,700——
2004-09-08$60.55$60.551,994,400——
2004-09-07$60.90$60.902,303,700——
2004-09-03$60.47$60.472,618,900——
2004-09-02$61.22$61.222,563,200——
2004-09-01$60.00$60.002,779,400——
2004-08-31$59.33$59.331,872,800——
2004-08-30$58.63$58.632,355,100——
2004-08-27$60.46$60.462,066,200——
2004-08-26$59.63$59.631,790,400——
2004-08-25$59.83$59.832,433,200——
2004-08-24$59.05$59.052,292,900——
2004-08-23$59.02$59.022,244,500——
2004-08-20$59.77$59.772,528,500——
2004-08-19$59.05$59.053,684,900——
2004-08-18$60.09$60.096,740,300——
2004-08-17$58.34$58.342,528,200——
2004-08-16$59.07$59.072,315,700——
2004-08-13$57.45$57.452,400,500——
2004-08-12$58.27$58.272,794,400——
2004-08-11$58.07$58.073,074,000——
2004-08-10$56.81$56.812,617,500——
2004-08-09$55.23$55.232,733,200——
2004-08-06$55.97$55.973,427,000——
2004-08-05$57.32$57.323,466,600——
2004-08-04$57.56$57.564,068,800——
2004-08-03$57.84$57.842,750,400——
2004-08-02$58.34$58.344,314,100——
2004-07-30$60.00$60.002,732,700——
2004-07-29$59.65$59.653,170,100——
2004-07-28$58.45$58.456,113,100——
2004-07-27$56.51$56.514,835,600——
2004-07-26$53.83$53.834,005,400——
2004-07-23$55.39$55.392,866,600——
2004-07-22$55.59$55.594,247,400——
2004-07-21$55.13$55.133,901,500——
2004-07-20$57.14$57.142,956,900——
2004-07-19$56.56$56.564,223,700——
2004-07-16$57.34$57.343,419,800——
2004-07-15$59.44$59.442,975,500——
2004-07-14$60.51$60.514,211,000——
2004-07-13$61.19$61.192,166,600——
2004-07-12$61.33$61.333,973,200——
2004-07-09$61.51$61.512,556,500——
2004-07-08$62.26$62.262,831,300——
2004-07-07$62.77$62.772,544,200——
2004-07-06$61.69$61.692,459,800——
2004-07-02$62.01$62.012,160,300——
2004-07-01$61.86$61.863,370,900——
2004-06-30$63.25$63.253,352,300——
2004-06-29$62.77$62.773,422,400——
2004-06-28$62.70$62.704,618,900——
2004-06-25$62.37$62.375,526,100——
2004-06-24$60.58$60.583,313,300——
2004-06-23$59.86$59.862,951,400——
2004-06-22$58.25$58.253,859,400——
2004-06-21$57.48$57.482,655,500——
2004-06-18$58.04$58.045,416,300——
2004-06-17$58.47$58.473,245,700——
2004-06-16$59.77$59.772,352,700——
2004-06-15$59.39$59.392,836,300——
2004-06-14$59.28$59.282,940,000——
2004-06-10$59.55$59.555,150,400——
2004-06-09$60.33$60.334,008,600——
2004-06-08$62.10$62.102,489,300——
2004-06-07$63.14$63.142,831,000——
2004-06-04$61.45$61.452,295,300——
2004-06-03$61.15$61.152,856,600——
2004-06-02$62.73$62.733,116,600——
2004-06-01$62.85$62.852,432,300——
2004-05-28$62.15$62.151,976,400——
2004-05-27$63.08$63.085,153,600——
2004-05-26$63.09$63.093,192,700——
2004-05-25$63.54$63.545,081,000——
2004-05-24$62.65$62.654,701,100——
2004-05-21$61.40$61.403,563,900——
2004-05-20$60.65$60.655,456,700——
2004-05-19$59.22$59.226,338,800——
2004-05-18$59.21$59.213,541,700——
2004-05-17$58.15$58.152,590,900——
2004-05-14$58.50$58.503,985,100——
2004-05-13$58.48$58.483,765,900——
2004-05-12$58.02$58.025,035,500——
2004-05-11$57.57$57.573,556,500——
2004-05-10$56.37$56.374,708,100——
2004-05-07$56.84$56.843,200,800——
2004-05-06$57.49$57.492,955,900——
2004-05-05$58.93$58.933,472,900——
2004-05-04$57.75$57.755,484,800——
2004-05-03$59.51$59.514,354,700——
2004-04-30$59.00$59.0010,975,300——
2004-04-29$57.01$57.014,519,800——
2004-04-28$57.80$57.803,950,900——
2004-04-27$59.99$59.993,686,900——
2004-04-26$60.09$60.093,251,800——
2004-04-23$60.68$60.682,288,100——
2004-04-22$60.77$60.773,533,800——
2004-04-21$58.73$58.733,423,300——
2004-04-20$57.90$57.904,281,600——
2004-04-19$60.62$60.624,192,800——
2004-04-16$59.46$59.464,823,800——
2004-04-15$57.69$57.693,880,000——
2004-04-14$56.91$56.912,499,200——
2004-04-13$55.83$55.832,374,800——
2004-04-12$56.60$56.601,999,600——
2004-04-08$55.03$55.033,852,100——
2004-04-07$55.25$55.254,275,900——
2004-04-06$56.94$56.942,384,900——
2004-04-05$57.63$57.632,482,200——
2004-04-02$57.97$57.973,187,200——
2004-04-01$56.50$56.503,299,700——
2004-03-31$55.60$55.602,576,300——
2004-03-30$56.03$56.032,694,100——
2004-03-29$55.93$55.934,482,700——
2004-03-26$53.18$53.182,548,900——
2004-03-25$54.63$54.633,541,700——
2004-03-24$54.63$54.635,760,300——
2004-03-23$52.73$52.734,497,000——
2004-03-22$52.32$52.323,461,100——
2004-03-19$52.88$52.883,728,400——
2004-03-18$53.51$53.513,403,600——
2004-03-17$54.17$54.175,231,200——
2004-03-16$51.78$51.787,233,700——
2004-03-15$52.91$52.914,704,400——
2004-03-12$54.70$54.704,538,900——
2004-03-11$53.99$53.995,617,000——
2004-03-10$55.00$55.004,609,400——
2004-03-09$56.19$56.196,156,500——
2004-03-08$57.50$57.504,283,500——
2004-03-05$59.21$59.215,200,700——
2004-03-04$59.02$59.025,652,800——
2004-03-03$58.28$58.287,239,100——
2004-03-02$57.64$57.647,230,400——
2004-03-01$56.11$56.114,492,900——
2004-02-27$55.45$55.456,353,000——
2004-02-26$55.65$55.654,829,200——
2004-02-25$54.76$54.764,051,400——
2004-02-24$55.03$55.038,228,400——
2004-02-23$55.70$55.707,302,600——
2004-02-20$56.87$56.878,966,300——
2004-02-19$58.88$58.8825,393,800——
2004-02-18$53.23$53.2334,523,600——
2004-02-17$44.26$44.262,882,700——
2004-02-13$43.53$43.532,491,800——
2004-02-12$44.41$44.413,680,000——
2004-02-11$44.14$44.142,394,700——
2004-02-10$43.41$43.412,669,400——
2004-02-09$44.06$44.062,691,600——
2004-02-06$43.50$43.503,124,600——
2004-02-05$42.18$42.183,642,600——
2004-02-04$43.18$43.184,078,100——
2004-02-03$44.91$44.912,851,600——
2004-02-02$44.28$44.284,092,000——
2004-01-30$42.98$42.982,965,900——
2004-01-29$43.40$43.405,977,900——
2004-01-28$42.83$42.833,972,700——
2004-01-27$44.47$44.473,792,600——
2004-01-26$45.61$45.614,832,500——
2004-01-23$44.32$44.325,742,500——
2004-01-22$44.48$44.487,874,300——
2004-01-21$44.78$44.786,226,100——
2004-01-20$43.52$43.525,284,700——
2004-01-16$43.19$43.197,205,600——
2004-01-15$41.85$41.854,690,900——
2004-01-14$40.42$40.424,310,700——
2004-01-13$40.80$40.804,264,200——
2004-01-12$41.49$41.494,562,300——
2004-01-09$42.38$42.388,304,800——
2004-01-08$41.25$41.257,009,900——
2004-01-07$40.79$40.797,002,900——
2004-01-06$38.59$38.595,022,800——
2004-01-05$37.10$37.102,363,100——
2004-01-02$36.94$36.942,675,900——