Biogen Stock (BIIB)
Showing Closing Date Range from Oct 6 to Nov 3, 2026 compared to Sep 7 to Oct 5, 2026.
Compare Last 28 Days with Previous Period
Investor Relations:biogen.com
Current Period Close
$249.01
Oct 06, 2026 - Nov 03, 2026
Previous Period Close
$223.59
Sep 07, 2026 - Oct 05, 2026
Net Comparison Delta
+$25.42 (+11.37%)
Relative performance vs prior benchmark
Historical Quotes & Breakdown(20 dates)
| Current Date | Current Close | Previous Date | Previous Close | Delta (%) |
|---|---|---|---|---|
| Nov 02, 2026 | $249.01 | - | - | - |
| Oct 30, 2026 | $253.62 | Oct 05, 2026 | $223.59 | +13.43% |
| Oct 29, 2026 | $249.65 | Oct 02, 2026 | $219.88 | +13.54% |
| Oct 28, 2026 | $244.05 | Oct 01, 2026 | $222.82 | +9.53% |
| Oct 27, 2026 | $252.73 | Sep 30, 2026 | $225.88 | +11.89% |
| Oct 26, 2026 | $252.26 | Sep 29, 2026 | $227.07 | +11.09% |
| Oct 23, 2026 | $250.69 | Sep 28, 2026 | $228.69 | +9.62% |
| Oct 22, 2026 | $253.84 | Sep 25, 2026 | $227.60 | +11.53% |
| Oct 21, 2026 | $240.98 | Sep 23, 2026 | $227.53 | +5.91% |
| Oct 20, 2026 | $243.10 | Sep 22, 2026 | $225.36 | +7.87% |
| Oct 19, 2026 | $233.48 | Sep 21, 2026 | $219.07 | +6.58% |
| Oct 16, 2026 | $232.65 | Sep 18, 2026 | $215.50 | +7.96% |
| Oct 15, 2026 | $235.35 | Sep 17, 2026 | $219.05 | +7.44% |
| Oct 14, 2026 | $232.83 | Sep 16, 2026 | $216.01 | +7.79% |
| Oct 13, 2026 | $228.90 | Sep 15, 2026 | $216.17 | +5.89% |
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