BIIB chart · All upcoming earnings
| Move | Mean | Median | Std dev | Hit rate |
|---|---|---|---|---|
| Day 1 | -0.2% | -1.0% | 6.3% | 37% |
| Day 2 | -0.1% | -0.4% | 2.4% | 47% |
| Day 3 | -0.4% | -0.8% | 2.0% | 40% |
| 5-day | +0.8% | -1.4% | 8.6% | 40% |
Day 1 = the close-to-close move on the first session to trade the news — hover for the EPS surprise.
| Report | Est | Actual | Surprise | Gap | 1-day | +5d | +1mo |
|---|---|---|---|---|---|---|---|
| 2026-07-29 beat | 2.03 | 3.60 | +77.4% | +2.4% | +1.8% | -1.2% | +5.9% |
| 2026-04-29 beat | 2.95 | 3.57 | +20.9% | -0.1% | +6.0% | -1.9% | +0.8% |
| 2026-02-06 beat | 1.62 | 1.99 | +23.2% | +0.9% | +8.5% | -2.3% | -6.3% |
| 2025-10-30 beat | 3.88 | 4.81 | +23.9% | -5.2% | +1.2% | +4.8% | +18.8% |
| 2025-07-31 beat | 3.88 | 5.47 | +41.0% | +5.0% | +1.1% | -0.2% | +3.3% |
| 2025-05-01 beat | 2.95 | 3.02 | +2.4% | -0.6% | -0.1% | -2.1% | +8.4% |
| 2025-02-12 beat | 3.36 | 3.44 | +2.3% | -1.9% | -4.3% | +2.7% | +4.5% |
| 2024-10-30 beat | 3.79 | 4.08 | +7.8% | +0.6% | -1.2% | -3.7% | -11.3% |
| 2024-08-01 beat | 4.03 | 5.28 | +31.0% | +1.2% | -1.2% | -3.1% | -2.8% |
| 2024-04-24 beat | 3.46 | 3.67 | +6.0% | +3.0% | +4.6% | +7.0% | +8.0% |
| 2024-02-13 miss | 3.18 | 2.95 | -7.2% | -3.7% | -7.4% | -2.4% | -3.1% |
| 2023-11-08 beat | 3.98 | 4.36 | +9.4% | +0.0% | -5.7% | -0.9% | +3.3% |
| 2023-07-25 beat | 3.76 | 4.02 | +6.9% | +1.0% | -2.4% | -0.4% | -2.0% |
| 2023-04-25 beat | 3.28 | 3.40 | +3.5% | -0.7% | -3.6% | +9.5% | +6.8% |
| 2023-02-15 beat | 3.48 | 4.05 | +16.2% | -0.4% | -3.5% | -2.5% | -5.7% |
| 2022-10-25 beat | 4.13 | 4.77 | +15.5% | +1.4% | -0.4% | +2.4% | +10.9% |
| 2022-07-20 beat | 4.07 | 5.25 | +29.0% | -1.5% | -5.8% | +2.6% | +4.3% |
| 2022-05-03 miss | 4.36 | 3.62 | -17.0% | +0.9% | -0.8% | -5.2% | -3.5% |
| 2022-02-03 beat | 3.37 | 3.39 | +0.6% | -4.4% | -2.1% | -0.1% | -6.5% |
| 2021-10-20 beat | 4.10 | 4.77 | +16.5% | +0.7% | -0.6% | -2.5% | -3.7% |
| 2021-07-22 beat | 4.60 | 5.68 | +23.5% | -0.9% | +1.1% | +0.9% | +4.7% |
| 2021-04-22 beat | 4.94 | 5.34 | +8.1% | -3.7% | -4.0% | +2.4% | +9.3% |
| 2021-02-03 miss | 4.80 | 4.58 | -4.5% | -2.8% | -5.2% | +4.5% | +2.8% |
| 2020-10-21 beat | 8.05 | 8.84 | +9.8% | -0.8% | +0.7% | -9.2% | -9.3% |
| 2020-07-22 beat | 8.00 | 10.26 | +28.2% | +1.8% | +0.2% | -1.2% | -1.2% |
| 2020-04-22 beat | 7.69 | 9.14 | +18.9% | -8.0% | -9.4% | +2.2% | +2.2% |
| 2020-01-30 beat | 8.08 | 8.34 | +3.3% | +2.0% | -1.8% | +21.5% | +18.1% |
| 2019-10-22 beat | 8.27 | 9.17 | +10.8% | +38.7% | +26.1% | +5.5% | +1.3% |
| 2019-07-23 beat | 7.53 | 9.15 | +21.4% | +2.8% | +4.9% | -1.0% | -4.4% |
| 2019-04-24 beat | 6.96 | 6.98 | +0.3% | +0.8% | -2.5% | +2.3% | +2.1% |
“1-day” is the close-to-close move over the session that first traded on the news (the next session for after-close reports). “+5d / +1mo” are the further drift from that close.
Earnings dates & estimates from Yahoo Finance (refreshed 2026-09-13); price reactions from end-of-day data. History, not a forecast. Not investment advice.