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 — 2021

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2021-12-31$239.92$239.921,532,700——
2021-12-30$240.00$240.004,423,100——
2021-12-29$258.31$258.316,869,700——
2021-12-28$235.99$235.99775,000——
2021-12-27$234.19$234.191,744,600——
2021-12-23$235.41$235.411,003,300——
2021-12-22$234.48$234.48783,300——
2021-12-21$234.65$234.651,030,200——
2021-12-20$236.96$236.961,127,700——
2021-12-17$237.43$237.432,262,900——
2021-12-16$235.52$235.521,252,200——
2021-12-15$235.88$235.881,262,400——
2021-12-14$230.76$230.761,232,500——
2021-12-13$234.50$234.501,236,600——
2021-12-10$232.62$232.62998,800——
2021-12-09$232.43$232.431,365,200——
2021-12-08$234.72$234.721,419,100——
2021-12-07$226.83$226.83941,300——
2021-12-06$224.11$224.111,101,800——
2021-12-03$223.92$223.921,427,700——
2021-12-02$228.52$228.521,276,200——
2021-12-01$229.50$229.501,672,700——
2021-11-30$235.74$235.743,294,300——
2021-11-29$236.11$236.112,229,100——
2021-11-26$242.90$242.901,300,400——
2021-11-24$250.13$250.131,579,800——
2021-11-23$254.15$254.15799,100——
2021-11-22$252.21$252.211,290,300——
2021-11-19$257.19$257.19898,800——
2021-11-18$256.79$256.79975,800——
2021-11-17$258.38$258.381,497,000——
2021-11-16$261.55$261.551,159,500——
2021-11-15$271.82$271.82756,300——
2021-11-12$270.43$270.43845,000——
2021-11-11$266.57$266.57637,700——
2021-11-10$266.93$266.93708,800——
2021-11-09$270.03$270.03894,700——
2021-11-08$272.70$272.701,151,900——
2021-11-05$278.68$278.68833,800——
2021-11-04$280.41$280.41949,100——
2021-11-03$279.59$279.591,041,500——
2021-11-02$272.51$272.511,839,100——
2021-11-01$272.10$272.101,222,600——
2021-10-29$266.68$266.68947,600——
2021-10-28$264.87$264.871,273,500——
2021-10-27$259.95$259.951,276,200——
2021-10-26$271.12$271.121,453,800——
2021-10-25$269.94$269.941,092,900——
2021-10-22$264.80$264.80873,200——
2021-10-21$270.21$270.211,374,200——
2021-10-20$266.57$266.572,153,000——
2021-10-19$268.13$268.131,801,700——
2021-10-18$269.73$269.731,496,100——
2021-10-15$281.19$281.191,299,600——
2021-10-14$285.26$285.26705,300——
2021-10-13$283.65$283.65521,400——
2021-10-12$284.79$284.79616,200——
2021-10-11$285.59$285.59620,600——
2021-10-08$285.83$285.83629,600——
2021-10-07$287.77$287.77879,900——
2021-10-06$283.55$283.55978,600——
2021-10-05$280.44$280.441,010,500——
2021-10-04$278.32$278.32924,900——
2021-10-01$283.94$283.94925,800——
2021-09-30$282.99$282.99793,900——
2021-09-29$285.56$285.56700,700——
2021-09-28$284.71$284.71785,100——
2021-09-27$286.62$286.62704,300——
2021-09-24$291.71$291.71817,500——
2021-09-23$293.20$293.20919,300——
2021-09-22$289.32$289.321,420,100——
2021-09-21$295.54$295.54738,000——
2021-09-20$298.49$298.49932,000——
2021-09-17$300.19$300.191,680,000——
2021-09-16$299.69$299.69752,200——
2021-09-15$299.21$299.211,125,800——
2021-09-14$295.95$295.951,039,000——
2021-09-13$301.94$301.94797,500——
2021-09-10$299.81$299.811,380,200——
2021-09-09$300.15$300.153,549,600——
2021-09-08$321.55$321.551,142,400——
2021-09-07$327.24$327.24967,300——
2021-09-03$333.60$333.60549,200——
2021-09-02$335.57$335.571,221,600——
2021-09-01$338.24$338.24791,500——
2021-08-31$338.91$338.91984,400——
2021-08-30$344.42$344.42555,100——
2021-08-27$343.19$343.19614,800——
2021-08-26$342.24$342.24717,200——
2021-08-25$342.75$342.75791,000——
2021-08-24$349.40$349.40628,900——
2021-08-23$346.43$346.43810,000——
2021-08-20$341.74$341.74794,100——
2021-08-19$338.62$338.62954,600——
2021-08-18$341.87$341.87668,600——
2021-08-17$349.79$349.791,139,400——
2021-08-16$343.50$343.50836,700——
2021-08-13$342.25$342.25744,500——
2021-08-12$340.68$340.68806,400——
2021-08-11$339.05$339.05784,100——
2021-08-10$337.22$337.22801,200——
2021-08-09$340.20$340.201,046,800——
2021-08-06$340.00$340.00822,200——
2021-08-05$336.59$336.59714,900——
2021-08-04$338.10$338.101,216,600——
2021-08-03$338.00$338.001,326,700——
2021-08-02$331.70$331.70962,600——
2021-07-30$326.73$326.73942,800——
2021-07-29$329.17$329.17660,200——
2021-07-28$334.18$334.18713,600——
2021-07-27$333.96$333.96929,300——
2021-07-26$331.93$331.931,269,500——
2021-07-23$325.40$325.401,015,900——
2021-07-22$326.36$326.361,485,600——
2021-07-21$322.96$322.961,126,300——
2021-07-20$322.49$322.491,384,600——
2021-07-19$324.16$324.161,036,300——
2021-07-16$324.62$324.621,534,800——
2021-07-15$328.16$328.163,031,700——
2021-07-14$352.06$352.061,237,100——
2021-07-13$351.92$351.92974,200——
2021-07-12$349.04$349.041,188,600——
2021-07-09$358.16$358.162,720,100——
2021-07-08$369.05$369.052,344,900——
2021-07-07$355.33$355.331,377,600——
2021-07-06$344.89$344.891,041,300——
2021-07-02$348.72$348.72811,800——
2021-07-01$348.92$348.92998,000——
2021-06-30$346.27$346.271,067,000——
2021-06-29$345.72$345.721,427,500——
2021-06-28$340.27$340.271,942,700——
2021-06-25$347.93$347.932,251,600——
2021-06-24$349.16$349.164,647,600——
2021-06-23$371.90$371.901,778,500——
2021-06-22$374.40$374.401,770,000——
2021-06-21$380.91$380.911,897,900——
2021-06-18$388.44$388.442,873,600——
2021-06-17$383.52$383.521,832,800——
2021-06-16$391.31$391.311,572,800——
2021-06-15$396.08$396.081,905,100——
2021-06-14$406.14$406.142,102,600——
2021-06-11$396.64$396.644,221,600——
2021-06-10$414.71$414.714,753,800——
2021-06-09$406.94$406.946,196,900——
2021-06-08$395.37$395.3712,209,300——
2021-06-07$395.85$395.8517,954,100——
2021-06-04$286.14$286.142,956,200——
2021-06-03$272.55$272.551,311,600——
2021-06-02$269.35$269.351,187,500——
2021-06-01$267.15$267.151,340,800——
2021-05-28$267.48$267.48957,000——
2021-05-27$267.37$267.371,792,800——
2021-05-26$267.84$267.841,777,500——
2021-05-25$273.45$273.45946,700——
2021-05-24$278.86$278.86838,200——
2021-05-21$283.19$283.19940,200——
2021-05-20$286.57$286.571,094,300——
2021-05-19$281.75$281.75723,100——
2021-05-18$281.01$281.01725,900——
2021-05-17$280.40$280.40944,400——
2021-05-14$280.21$280.21991,000——
2021-05-13$281.71$281.711,039,500——
2021-05-12$274.02$274.02929,700——
2021-05-11$278.39$278.39950,900——
2021-05-10$275.61$275.61895,000——
2021-05-07$274.04$274.04936,100——
2021-05-06$272.11$272.11929,600——
2021-05-05$271.57$271.57787,600——
2021-05-04$271.02$271.02954,800——
2021-05-03$275.31$275.31981,800——
2021-04-30$267.33$267.33894,500——
2021-04-29$265.33$265.33530,400——
2021-04-28$267.60$267.60691,800——
2021-04-27$267.39$267.39749,800——
2021-04-26$269.46$269.461,115,700——
2021-04-23$262.63$262.63911,400——
2021-04-22$259.00$259.002,411,300——
2021-04-21$269.85$269.851,053,000——
2021-04-20$273.20$273.20841,100——
2021-04-19$269.05$269.05884,700——
2021-04-16$270.31$270.311,014,800——
2021-04-15$270.44$270.44986,300——
2021-04-14$265.79$265.79697,400——
2021-04-13$266.19$266.19823,300——
2021-04-12$262.80$262.80753,600——
2021-04-09$268.17$268.17874,100——
2021-04-08$265.73$265.73800,900——
2021-04-07$268.02$268.02851,400——
2021-04-06$271.76$271.761,006,500——
2021-04-05$277.88$277.88744,900——
2021-04-01$278.71$278.71996,300——
2021-03-31$279.75$279.751,135,800——
2021-03-30$276.01$276.01882,100——
2021-03-29$276.08$276.08794,700——
2021-03-26$276.63$276.63665,300——
2021-03-25$273.97$273.971,685,100——
2021-03-24$265.69$265.69951,800——
2021-03-23$267.21$267.21888,100——
2021-03-22$272.34$272.341,169,000——
2021-03-19$267.07$267.072,117,900——
2021-03-18$262.27$262.27885,100——
2021-03-17$264.15$264.151,092,900——
2021-03-16$259.92$259.921,421,600——
2021-03-15$260.13$260.132,829,400——
2021-03-12$266.13$266.131,034,300——
2021-03-11$267.44$267.441,596,300——
2021-03-10$262.61$262.611,736,400——
2021-03-09$266.49$266.491,769,100——
2021-03-08$270.01$270.011,163,800——
2021-03-05$270.71$270.711,062,500——
2021-03-04$263.57$263.571,291,500——
2021-03-03$266.60$266.601,037,100——
2021-03-02$269.85$269.851,258,200——
2021-03-01$273.24$273.241,060,100——
2021-02-26$272.88$272.881,535,100——
2021-02-25$277.26$277.261,023,800——
2021-02-24$282.74$282.74889,300——
2021-02-23$279.08$279.081,306,200——
2021-02-22$284.63$284.631,397,700——
2021-02-19$278.35$278.351,254,000——
2021-02-18$275.90$275.90933,000——
2021-02-17$276.67$276.67960,300——
2021-02-16$279.32$279.321,303,600——
2021-02-12$278.03$278.031,033,900——
2021-02-11$278.81$278.811,214,200——
2021-02-10$275.00$275.001,353,800——
2021-02-09$269.31$269.31749,600——
2021-02-08$268.93$268.931,045,900——
2021-02-05$265.09$265.091,061,000——
2021-02-04$267.39$267.391,663,200——
2021-02-03$263.25$263.252,521,700——
2021-02-02$277.72$277.721,194,000——
2021-02-01$278.46$278.461,445,700——
2021-01-29$282.61$282.614,789,400——
2021-01-28$267.87$267.87979,600——
2021-01-27$265.15$265.151,116,300——
2021-01-26$271.67$271.67777,200——
2021-01-25$275.54$275.54806,800——
2021-01-22$269.44$269.44691,100——
2021-01-21$270.12$270.12806,500——
2021-01-20$270.28$270.281,293,300——
2021-01-19$273.84$273.841,213,900——
2021-01-15$275.84$275.841,765,000——
2021-01-14$280.29$280.291,520,400——
2021-01-13$266.67$266.67943,300——
2021-01-12$267.39$267.391,097,200——
2021-01-11$267.52$267.522,999,200——
2021-01-08$252.54$252.54988,700——
2021-01-07$250.44$250.441,118,600——
2021-01-06$247.75$247.751,279,100——
2021-01-05$246.39$246.391,166,300——
2021-01-04$242.95$242.951,563,400——