BIIB Earnings Reaction History
Biogen Inc.
EPS, Revenue, Stock Move
BIIB stock rises 0.4% on average on the first trading day after earnings.
When BIIB delivers a double beat, the stock rises 0.8% on average on the first trading day.
Across 133 releases, BIIB has delivered a positive next-day return 48.8% of the time.
Reaction Snapshot (Avg Day 1-3)
Day 1
+0.44%
Day 2
+0.08%
Day 3
-0.58%
Conditioned Moves (Day 1 Basis)
Double Beat
+0.76%
Mixed
+0.62%
Double Miss
-3.50%
EPS Beat Rate
69.9%
Revenue Beat Rate
65.4%
Positive Rate
48.8%
Both Beat Rate
58.6%
Recent Earnings History
| Date | EPS | Revenue | Day 1 | Day 2 | Day 3 | Detail |
|---|---|---|---|---|---|---|
| 2026-05-07 | — | — | — | — | — | Open |
| 2026-04-29 | — | — | — | — | — | Open |
| 2026-02-06 | Beat+24.37% | Beat+1.02% | +8.53% | -3.66% | -2.49% | Open |
| 2025-10-30 | Beat+23.65% | Beat+4.91% | +1.18% | +3.11% | -1.83% | Open |
| 2025-07-31 | Beat+39.19% | Beat+13.63% | +1.07% | +3.09% | +0.19% | Open |
| 2025-05-01 | Miss-7.36% | Beat+8.81% | -0.12% | +2.15% | -1.40% | Open |
| 2025-02-12 | Beat+0.58% | Beat+1.93% | -4.28% | +3.76% | -0.81% | Open |
| 2024-10-30 | Beat+8.22% | Beat+1.29% | -1.25% | -3.96% | -0.12% | Open |
FAQ
How much does BIIB usually move after earnings?
BIIB moves about 0.4% on average on the first trading day after earnings. Net average direction is +0.44%.
What is BIIB's biggest post-earnings gain?
BIIB's largest recorded next-day earnings gain is +26.11%, on 2019-10-22.