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 — 2025

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2025-12-31$175.99$175.99890,400
2025-12-30$176.40$176.40609,800
2025-12-29$176.83$176.83928,100
2025-12-26$177.08$177.08687,400
2025-12-24$176.33$176.33434,700
2025-12-23$174.82$174.821,281,600
2025-12-22$174.70$174.701,909,500
2025-12-19$174.80$174.8014,994,800
2025-12-18$169.91$169.912,761,000
2025-12-17$172.10$172.102,783,500
2025-12-16$171.50$171.502,408,300
2025-12-15$175.74$175.742,291,500
2025-12-12$174.10$174.101,781,500
2025-12-11$172.50$172.502,721,400
2025-12-10$177.55$177.552,147,900
2025-12-09$175.84$175.841,506,600
2025-12-08$180.44$180.441,474,200
2025-12-05$181.30$181.301,210,000
2025-12-04$181.98$181.981,246,300
2025-12-03$180.75$180.751,845,100
2025-12-02$180.18$180.181,866,300
2025-12-01$177.78$177.781,946,900
2025-11-28$182.09$182.09566,400
2025-11-26$181.94$181.941,482,900
2025-11-25$181.96$181.962,344,500
2025-11-24$176.82$176.824,164,200
2025-11-21$175.30$175.302,268,000
2025-11-20$168.18$168.181,914,500
2025-11-19$167.93$167.931,766,000
2025-11-18$168.83$168.832,257,400
2025-11-17$164.68$164.682,244,600
2025-11-14$167.55$167.552,620,400
2025-11-13$164.73$164.732,993,000
2025-11-12$161.48$161.481,659,700
2025-11-11$159.56$159.561,504,500
2025-11-10$156.26$156.261,258,600
2025-11-07$155.51$155.511,552,000
2025-11-06$156.74$156.741,848,500
2025-11-05$153.43$153.431,806,000
2025-11-04$149.33$149.332,028,900
2025-11-03$151.44$151.442,197,200
2025-10-31$154.27$154.272,235,300
2025-10-30$149.61$149.612,745,200
2025-10-29$147.86$147.862,450,700
2025-10-28$149.13$149.131,662,800
2025-10-27$150.43$150.431,214,300
2025-10-24$149.89$149.891,338,300
2025-10-23$150.08$150.081,246,000
2025-10-22$147.72$147.721,403,100
2025-10-21$146.22$146.22895,000
2025-10-20$146.63$146.631,316,200
2025-10-17$143.00$143.001,010,000
2025-10-16$142.26$142.261,469,100
2025-10-15$143.66$143.661,337,200
2025-10-14$145.31$145.311,283,400
2025-10-13$144.69$144.691,124,300
2025-10-10$146.57$146.571,725,000
2025-10-09$149.61$149.611,600,400
2025-10-08$150.97$150.971,333,300
2025-10-07$152.21$152.211,372,500
2025-10-06$154.05$154.051,817,900
2025-10-03$159.88$159.882,878,800
2025-10-02$155.25$155.252,882,300
2025-10-01$154.22$154.224,059,900
2025-09-30$140.08$140.081,368,900
2025-09-29$138.52$138.521,285,500
2025-09-26$137.37$137.371,677,100
2025-09-25$135.67$135.671,260,300
2025-09-24$137.67$137.671,309,100
2025-09-23$139.31$139.311,102,800
2025-09-22$140.66$140.661,445,800
2025-09-19$142.50$142.503,748,500
2025-09-18$143.81$143.811,514,400
2025-09-17$144.87$144.871,501,900
2025-09-16$143.68$143.681,935,800
2025-09-15$143.32$143.321,432,300
2025-09-12$144.86$144.861,810,700
2025-09-11$148.84$148.841,714,600
2025-09-10$142.61$142.611,278,800
2025-09-09$143.60$143.601,490,700
2025-09-08$141.35$141.351,624,300
2025-09-05$140.67$140.671,561,800
2025-09-04$139.94$139.941,529,000
2025-09-03$141.62$141.622,279,400
2025-09-02$139.63$139.632,466,900
2025-08-29$132.22$132.221,083,000
2025-08-28$132.65$132.651,557,800
2025-08-27$136.36$136.361,403,100
2025-08-26$136.72$136.721,579,900
2025-08-25$136.36$136.36861,800
2025-08-22$139.31$139.311,198,900
2025-08-21$139.12$139.121,074,100
2025-08-20$138.99$138.991,286,300
2025-08-19$138.86$138.861,447,800
2025-08-18$135.91$135.911,813,900
2025-08-15$138.60$138.601,643,800
2025-08-14$134.94$134.941,169,800
2025-08-13$135.19$135.191,549,000
2025-08-12$128.93$128.931,127,600
2025-08-11$128.00$128.001,070,300
2025-08-08$130.67$130.671,327,700
2025-08-07$127.75$127.751,718,100
2025-08-06$129.34$129.341,538,600
2025-08-05$132.89$132.891,395,600
2025-08-04$132.20$132.201,897,800
2025-08-01$131.95$131.952,798,200
2025-07-31$128.00$128.003,239,700
2025-07-30$126.64$126.641,892,100
2025-07-29$127.90$127.901,108,800
2025-07-28$129.28$129.281,045,500
2025-07-25$131.52$131.52977,000
2025-07-24$132.59$132.591,280,500
2025-07-23$130.98$130.981,127,200
2025-07-22$127.85$127.851,319,100
2025-07-21$122.68$122.681,403,500
2025-07-18$124.99$124.991,524,800
2025-07-17$128.69$128.691,151,200
2025-07-16$128.46$128.461,234,700
2025-07-15$127.50$127.501,317,000
2025-07-14$133.11$133.11694,400
2025-07-11$134.21$134.211,137,500
2025-07-10$135.33$135.33992,000
2025-07-09$133.02$133.021,528,800
2025-07-08$134.46$134.461,350,600
2025-07-07$130.13$130.131,086,900
2025-07-03$132.87$132.87633,300
2025-07-02$133.19$133.191,474,200
2025-07-01$130.07$130.071,919,400
2025-06-30$125.59$125.591,184,400
2025-06-27$126.08$126.081,100,000
2025-06-26$126.92$126.92864,900
2025-06-25$127.31$127.311,095,900
2025-06-24$126.31$126.31938,200
2025-06-23$124.76$124.761,190,200
2025-06-20$127.04$127.042,166,600
2025-06-18$126.54$126.542,331,000
2025-06-17$126.56$126.561,154,600
2025-06-16$131.04$131.041,111,900
2025-06-13$130.65$130.651,207,400
2025-06-12$132.31$132.311,147,500
2025-06-11$133.06$133.061,331,100
2025-06-10$135.49$135.49991,000
2025-06-09$134.15$134.151,081,500
2025-06-06$133.13$133.131,166,100
2025-06-05$130.36$130.361,235,400
2025-06-04$131.86$131.861,472,900
2025-06-03$131.84$131.841,824,900
2025-06-02$131.14$131.141,868,100
2025-05-30$129.79$129.793,640,000
2025-05-29$132.75$132.751,957,000
2025-05-28$127.53$127.531,558,700
2025-05-27$128.39$128.391,584,200
2025-05-23$125.81$125.81837,400
2025-05-22$126.30$126.30937,000
2025-05-21$126.82$126.821,593,900
2025-05-20$130.55$130.551,684,800
2025-05-19$129.44$129.442,387,500
2025-05-16$125.59$125.591,804,000
2025-05-15$123.70$123.701,944,900
2025-05-14$120.37$120.371,495,500
2025-05-13$123.16$123.161,715,200
2025-05-12$124.40$124.402,554,500
2025-05-09$118.17$118.171,307,000
2025-05-08$118.39$118.391,871,800
2025-05-07$117.21$117.211,684,100
2025-05-06$116.82$116.821,736,100
2025-05-05$121.80$121.801,099,100
2025-05-02$123.53$123.531,460,000
2025-05-01$120.93$120.932,377,200
2025-04-30$121.08$121.081,528,300
2025-04-29$120.17$120.171,003,200
2025-04-28$119.12$119.121,345,600
2025-04-25$118.84$118.841,538,300
2025-04-24$119.51$119.511,600,200
2025-04-23$118.17$118.172,427,300
2025-04-22$118.89$118.891,076,700
2025-04-21$116.49$116.491,756,800
2025-04-17$118.61$118.611,206,300
2025-04-16$115.29$115.291,341,100
2025-04-15$116.98$116.981,030,700
2025-04-14$119.26$119.261,687,600
2025-04-11$115.17$115.171,618,700
2025-04-10$113.38$113.382,420,900
2025-04-09$120.49$120.493,321,400
2025-04-08$114.05$114.052,091,100
2025-04-07$119.19$119.192,520,100
2025-04-04$122.98$122.983,090,700
2025-04-03$130.71$130.711,755,600
2025-04-02$131.32$131.321,944,900
2025-04-01$132.03$132.031,352,400
2025-03-31$136.84$136.841,865,400
2025-03-28$138.37$138.371,094,000
2025-03-27$140.33$140.331,383,500
2025-03-26$142.43$142.431,514,600
2025-03-25$139.16$139.161,766,200
2025-03-24$141.60$141.601,830,500
2025-03-21$140.90$140.903,437,600
2025-03-20$141.38$141.38971,800
2025-03-19$141.43$141.431,180,400
2025-03-18$143.09$143.091,506,900
2025-03-17$143.54$143.541,249,000
2025-03-14$139.44$139.441,436,800
2025-03-13$139.98$139.981,300,900
2025-03-12$140.19$140.192,438,000
2025-03-11$143.66$143.661,857,200
2025-03-10$150.71$150.712,651,100
2025-03-07$150.38$150.382,925,500
2025-03-06$147.37$147.371,145,200
2025-03-05$143.77$143.771,185,000
2025-03-04$142.65$142.652,790,700
2025-03-03$141.71$141.711,617,100
2025-02-28$140.50$140.502,324,300
2025-02-27$139.88$139.881,215,900
2025-02-26$140.49$140.491,310,200
2025-02-25$143.46$143.461,580,300
2025-02-24$141.27$141.271,565,400
2025-02-21$140.64$140.641,814,000
2025-02-20$137.08$137.082,056,500
2025-02-19$136.68$136.681,548,400
2025-02-18$136.57$136.571,327,600
2025-02-14$137.33$137.331,692,200
2025-02-13$138.45$138.452,257,400
2025-02-12$133.43$133.433,538,200
2025-02-11$139.39$139.391,910,100
2025-02-10$142.54$142.541,523,700
2025-02-07$141.35$141.351,154,100
2025-02-06$142.37$142.371,329,300
2025-02-05$145.53$145.531,173,500
2025-02-04$142.49$142.491,055,800
2025-02-03$142.34$142.341,110,600
2025-01-31$143.93$143.931,402,200
2025-01-30$146.23$146.231,110,800
2025-01-29$144.41$144.411,484,400
2025-01-28$145.49$145.491,301,700
2025-01-27$148.76$148.761,662,700
2025-01-24$146.20$146.201,302,700
2025-01-23$143.67$143.671,466,000
2025-01-22$142.75$142.751,082,700
2025-01-21$140.98$140.981,183,500
2025-01-17$140.55$140.551,149,900
2025-01-16$141.23$141.231,198,700
2025-01-15$141.00$141.001,557,600
2025-01-14$143.06$143.061,710,000
2025-01-13$150.18$150.181,142,800
2025-01-10$148.82$148.821,256,300
2025-01-08$150.75$150.751,038,700
2025-01-07$153.15$153.151,110,300
2025-01-06$153.27$153.271,319,800
2025-01-03$152.21$152.211,188,700
2025-01-02$150.00$150.001,097,100