Biogen Stock (BIIB)
Compare Last 6 Months with Previous Period
Current Period Close
$220.83
Mar 08, 2026 - Sep 04, 2026
Previous Period Close
$184.87
Sep 08, 2025 - Mar 07, 2026
Net Comparison Delta
+$35.96 (+19.45%)
Relative performance vs prior benchmark
Historical Quotes & Breakdown(126 dates)
| Current Date | Current Close | Previous Date | Previous Close | Delta (%) |
|---|---|---|---|---|
| Mar 09, 2026 | $188.24 | Sep 08, 2025 | $141.35 | +33.17% |
| Mar 10, 2026 | $188.41 | Sep 09, 2025 | $143.60 | +31.20% |
| Mar 11, 2026 | $190.48 | Sep 10, 2025 | $142.61 | +33.57% |
| Mar 12, 2026 | $184.90 | Sep 11, 2025 | $148.84 | +24.23% |
| Mar 13, 2026 | $181.55 | Sep 12, 2025 | $144.86 | +25.33% |
| Mar 16, 2026 | $183.26 | Sep 15, 2025 | $143.32 | +27.87% |
| Mar 17, 2026 | $185.29 | Sep 16, 2025 | $143.68 | +28.96% |
| Mar 18, 2026 | $182.31 | Sep 17, 2025 | $144.87 | +25.84% |
| Mar 19, 2026 | $183.41 | Sep 18, 2025 | $143.81 | +27.54% |
| Mar 20, 2026 | $181.46 | Sep 19, 2025 | $142.50 | +27.34% |
| Mar 23, 2026 | $183.64 | Sep 22, 2025 | $140.66 | +30.56% |
| Mar 24, 2026 | $183.94 | Sep 23, 2025 | $139.31 | +32.04% |
| Mar 25, 2026 | $189.18 | Sep 24, 2025 | $137.67 | +37.42% |
| Mar 26, 2026 | $191.06 | Sep 25, 2025 | $135.67 | +40.83% |
| Mar 27, 2026 | $183.84 | Sep 26, 2025 | $137.37 | +33.83% |
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