Biogen Stock (BIIB)
Showing Closing Date Range from Aug 1 to Oct 30, 2026 compared to May 2 to Jul 31, 2026.
Compare Last 3 Months with Previous Period
Investor Relations:biogen.com
Current Period Close
$253.62
Aug 01, 2026 - Oct 30, 2026
Previous Period Close
$202.95
May 02, 2026 - Jul 31, 2026
Net Comparison Delta
+$50.67 (+24.97%)
Relative performance vs prior benchmark
Historical Quotes & Breakdown(63 dates)
| Current Date | Current Close | Previous Date | Previous Close | Delta (%) |
|---|---|---|---|---|
| Oct 30, 2026 | $253.62 | - | - | - |
| Oct 29, 2026 | $249.65 | Jul 31, 2026 | $202.95 | +23.01% |
| Oct 28, 2026 | $244.05 | Jul 30, 2026 | $207.93 | +17.37% |
| Oct 27, 2026 | $252.73 | Jul 29, 2026 | $209.23 | +20.79% |
| Oct 26, 2026 | $252.26 | Jul 28, 2026 | $205.61 | +22.69% |
| Oct 23, 2026 | $250.69 | Jul 27, 2026 | $200.14 | +25.26% |
| Oct 22, 2026 | $253.84 | Jul 24, 2026 | $202.19 | +25.55% |
| Oct 21, 2026 | $240.98 | Jul 23, 2026 | $200.62 | +20.12% |
| Oct 20, 2026 | $243.10 | Jul 22, 2026 | $197.74 | +22.94% |
| Oct 19, 2026 | $233.48 | Jul 21, 2026 | $203.16 | +14.92% |
| Oct 16, 2026 | $232.65 | Jul 20, 2026 | $199.95 | +16.35% |
| Oct 15, 2026 | $235.35 | Jul 17, 2026 | $205.99 | +14.25% |
| Oct 14, 2026 | $232.83 | Jul 16, 2026 | $208.92 | +11.44% |
| Oct 13, 2026 | $228.90 | Jul 15, 2026 | $197.24 | +16.05% |
| Oct 12, 2026 | $229.41 | Jul 14, 2026 | $191.95 | +19.52% |
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