Biogen Stock (BIIB)
Compare Last 28 Days Same Dates of Previous Year
Current Period Close
$220.83
Aug 07, 2026 - Sep 04, 2026
Previous Year Close
$139.94
Aug 07, 2025 - Sep 04, 2025
Net Comparison Delta
+$80.89 (+57.80%)
Relative performance vs prior benchmark
Historical Quotes & Breakdown(21 dates)
| Current Date | Current Close | Previous Date | Previous Close | Delta (%) |
|---|---|---|---|---|
| Aug 07, 2026 | $207.94 | Aug 07, 2025 | $127.75 | +62.77% |
| Aug 10, 2026 | $207.13 | Aug 08, 2025 | $130.67 | +58.51% |
| Aug 11, 2026 | $203.89 | Aug 11, 2025 | $128.00 | +59.29% |
| Aug 12, 2026 | $208.87 | Aug 12, 2025 | $128.93 | +62.00% |
| Aug 13, 2026 | $210.65 | Aug 13, 2025 | $135.19 | +55.82% |
| Aug 14, 2026 | $209.83 | Aug 14, 2025 | $134.94 | +55.50% |
| Aug 17, 2026 | $209.15 | Aug 15, 2025 | $138.60 | +50.90% |
| Aug 18, 2026 | $212.55 | Aug 18, 2025 | $135.91 | +56.39% |
| Aug 19, 2026 | $221.56 | Aug 19, 2025 | $138.86 | +59.56% |
| Aug 20, 2026 | $214.35 | Aug 20, 2025 | $138.99 | +54.22% |
| Aug 21, 2026 | $216.78 | Aug 21, 2025 | $139.12 | +55.82% |
| Aug 24, 2026 | $218.12 | Aug 22, 2025 | $139.31 | +56.57% |
| Aug 25, 2026 | $220.77 | Aug 25, 2025 | $136.36 | +61.90% |
| Aug 26, 2026 | $221.07 | Aug 26, 2025 | $136.72 | +61.70% |
| Aug 27, 2026 | $221.50 | Aug 27, 2025 | $136.36 | +62.44% |
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