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Biogen Inc. (BIIB) stock

BIIBNasdaqBiological Products, (No Diagnostic Substances)Fiscal year ends December 31
Financials through Q2 FY2026, quarter ended Jun 30, 2026Last filing: 10-Q on Oct 28, 2026Score 4/3061% above fair value
$253.62+3.97 (+1.59%)

Close on Oct 30, 2026Market cap $37.47BP/E 44.9Yield –

Price history

Biogen share prices for every week, newest first. Adjusted for stock splits, not for dividends.

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Close, Oct 30, 2026
$253.62
+1.59% on the day
52-week range
$138.00 – $258.78
-2.0% from the high
Change over 52 weeks
+69.5%
From $149.61 on Oct 30, 2025
Average volume
1.16M
Shares a day, last 90 sessions
Week ofOpenHighLowCloseChangeVolume
Oct 26, 2026$251.02$258.78$243.03$253.62+1.17%7,306,406
Oct 19, 2026$231.81$254.41$231.04$250.69+7.75%6,650,281
Oct 12, 2026$233.98$240.99$226.71$232.65+3.07%7,493,766
Oct 5, 2026$219.90$228.00$215.73$225.71+2.65%5,411,758
Sep 28, 2026$225.87$230.49$219.81$219.88-3.39%6,582,763
Sep 21, 2026$216.14$229.19$214.59$227.60+5.61%5,528,168
Sep 14, 2026$221.00$222.25$213.54$215.50-0.76%5,465,264
Sep 8, 2026$215.45$219.76$208.93$217.15-1.67%3,324,697
Aug 31, 2026$216.47$225.80$213.58$220.83+1.07%3,900,635
Aug 24, 2026$216.40$222.85$213.96$218.50+0.79%2,807,605
Aug 17, 2026$208.36$222.15$207.62$216.78+3.31%3,729,133
Aug 10, 2026$206.70$215.61$201.00$209.83+0.91%3,847,610
Aug 3, 2026$203.34$212.18$199.58$207.94+2.46%4,753,816
Jul 27, 2026$202.75$218.59$199.40$202.95+0.38%6,950,130
Jul 20, 2026$204.08$205.65$196.92$202.19-1.84%4,085,721
Jul 13, 2026$199.33$215.79$186.03$205.99+3.43%11,253,541
Jul 6, 2026$215.95$215.95$194.37$199.15-7.85%7,113,707
Jun 29, 2026$215.74$219.72$209.67$216.12+0.04%4,665,119
Jun 22, 2026$199.48$218.06$194.74$216.03+9.89%7,781,159
Jun 15, 2026$198.37$201.75$193.20$196.58-1.73%4,733,477
Jun 8, 2026$197.25$203.45$192.18$200.05+2.41%4,919,844
Jun 1, 2026$194.50$200.66$184.90$195.34-0.34%4,430,949
May 26, 2026$194.30$199.80$192.27$196.00+1.16%4,285,079
May 18, 2026$191.25$194.75$185.85$193.76+0.42%5,393,669
May 11, 2026$194.76$205.97$189.49$192.95-0.26%8,255,207
May 4, 2026$186.28$195.20$185.44$193.45+3.42%3,621,249
Apr 27, 2026$183.16$195.98$179.15$187.06+1.45%7,038,354
Apr 20, 2026$179.54$192.75$178.72$184.38+3.96%5,415,618
Apr 13, 2026$172.62$181.77$171.22$177.35+2.53%6,327,519
Apr 6, 2026$177.00$180.24$168.64$172.97-2.46%7,723,066
Mar 30, 2026$186.16$190.09$171.37$177.34-3.54%6,249,425
Mar 23, 2026$183.48$192.28$180.33$183.84+1.31%4,245,524
Mar 16, 2026$182.75$186.52$180.47$181.46-0.05%5,635,302
Mar 9, 2026$183.91$192.99$181.46$181.55-1.80%4,147,544
Mar 2, 2026$190.22$190.99$181.24$184.87-3.62%4,360,686
Feb 23, 2026$191.82$198.72$185.90$191.82-0.11%4,928,362
Feb 17, 2026$197.46$200.29$189.95$192.03-2.28%3,828,069
Feb 9, 2026$199.83$201.00$187.20$196.52-2.32%7,939,674
Feb 2, 2026$179.30$202.41$176.19$201.18+11.84%10,906,838
Jan 26, 2026$171.67$180.14$170.59$179.89+4.84%5,736,615
Jan 20, 2026$161.51$175.29$160.36$171.59+4.36%5,573,924
Jan 12, 2026$188.00$188.00$163.74$164.42-12.37%9,892,888
Jan 5, 2026$175.73$190.20$171.61$187.62+5.51%8,941,179
Dec 29, 2025$177.00$178.46$174.28$177.82+0.42%3,524,245
Dec 22, 2025$174.78$177.29$172.90$177.08+1.30%4,313,385
Dec 15, 2025$173.67$176.42$168.56$174.80+0.40%25,239,417
Dec 8, 2025$181.30$182.12$169.24$174.10-3.97%9,632,415
Dec 1, 2025$180.15$183.15$174.53$181.30-0.43%8,115,099
Nov 24, 2025$177.65$185.17$175.57$182.09+3.87%8,558,457
Nov 17, 2025$167.00$176.02$163.00$175.30+4.63%10,451,141
Nov 10, 2025$155.41$169.00$153.77$167.55+7.74%10,036,888
Nov 3, 2025$153.60$157.80$148.51$155.51+0.80%9,433,165

Seasonality

BIIB return in each calendar month over the last 10 years, including dividends. The current month runs to the latest close.

YearJanFebMarAprMayJunJulAugSepOctNovDec
Average1.5%-2.5%-3.8%-1.5%0.7%4.0%0.9%1.2%2.5%0.8%1.5%-1.7%
Months up5 of 103 of 103 of 102 of 106 of 106 of 106 of 106 of 104 of 104 of 105 of 93 of 9
20262.2%6.6%-4.4%3.2%3.6%10.2%-6.1%6.8%4.3%12.3%
2025-5.9%-2.4%-2.6%-11.5%7.2%-3.2%1.9%3.3%5.9%10.1%18.0%-3.3%
2024-4.7%-12.0%-0.6%-0.4%4.7%3.1%-8.0%-4.0%-5.3%-10.2%-7.7%-4.8%
20235.0%-7.2%3.0%9.4%-2.6%-3.9%-5.1%-1.0%-3.9%-7.6%-1.5%10.5%
2022-5.8%-6.6%-0.2%-1.5%-3.6%2.0%5.5%-9.2%36.7%6.2%7.7%-9.3%
202115.4%-3.4%2.5%-4.4%0.1%29.5%-5.6%3.7%-16.5%-5.8%-11.6%1.8%
2020-9.4%14.7%2.6%-6.2%3.5%-12.9%2.7%4.7%-1.4%-11.1%-4.7%2.0%
201910.9%-1.7%-27.9%-3.0%-4.3%6.6%1.7%-7.6%5.9%28.3%0.4%-1.0%
20189.2%-16.9%-5.2%-0.1%7.4%-1.3%15.2%5.7%-0.1%-13.9%9.7%-9.8%
2017-2.2%4.1%-5.3%-0.8%-8.6%9.5%6.7%9.3%-1.1%-0.5%3.4%-1.1%