A company beats earnings. The stock goes up. Simple, right? Not exactly. We tracked over 12,000 earnings reports from S&P 500 companies across 2023, 2024, and 2025. About 75% of them beat EPS estimates. But only 53% of those beats actually resulted in a positive 1-day price move.
That means nearly half of all earnings beats led to flat or negative stock reactions. The beat alone doesn't tell you much. What matters is what kind of beat it was.
The Follow-Through Problem
We dug deeper into the data. Of the stocks that beat earnings AND went up on day one, how many kept going? We measured follow-through across BigEarnings' four tracking windows: 1-day, 1-week, 1-month, and ER-to-ER (the full period between consecutive earnings reports).
Here's what we found: 62% of stocks that were positive on day one were still positive at the 1-week mark. By 1-month, that number dropped to 55%. By ER-to-ER, it was 51%. So the initial pop fades for a lot of names. But a meaningful subset keeps running. The question is what separates the two groups.
Characteristics of Beats That Rally
We isolated the stocks that beat earnings, gapped up on day one, and were still positive at the 1-month mark. These "full follow-through" stocks shared several traits:
| Characteristic | Follow-Through Group | Faded Group |
|---|---|---|
| EPS surprise % | +12.4% avg | +4.1% avg |
| Revenue beat rate | 88% | 61% |
| Guidance raised | 64% | 22% |
| Pre-ER run-up (30 days) | +2.1% avg | +7.8% avg |
| Sector beat rate | 72% avg | 68% avg |
| Trailing 4Q beat streak | 3.6 quarters | 2.4 quarters |
A few things stand out. The follow-through group had triple the EPS surprise magnitude. They beat on revenue too, not just EPS. And they raised guidance at nearly 3x the rate of the faded group.
But the most interesting finding is the pre-ER run-up column. Stocks that rallied hard before the report (+7.8% on average) were much more likely to fade after a beat. The beat was already priced in. Stocks with modest pre-ER moves had more room to run.
The Post-Earnings Drift Connection
Academic research on PEAD predicts exactly this pattern. The market under-reacts to genuine surprises and over-reacts to expected beats. A +12% surprise on a stock that hasn't moved much pre-earnings is a real information shock. A +4% surprise on a stock that already ran 8%? That's just confirmation of what the market already knew.
This is why tracking the actual surprise magnitude, combined with post-ER price data, matters so much more than a simple "beat" or "miss" label.
A Practical Framework
Based on the data, here's how to identify beats with real follow-through potential:
- Look for EPS surprises of +8% or greater. Small beats fade at a much higher rate.
- Confirm the revenue beat. EPS-only beats driven by cost cuts rarely sustain momentum.
- Check guidance. Raised guidance is the single strongest predictor of 1-month follow-through in our data.
- Watch the pre-ER price action. If the stock already rallied 5%+ in the 30 days before earnings, the beat may be priced in.
- Verify the 1-day reaction. A gap up that holds through the close is a stronger signal than one that fades intraday.
How BigEarnings Tracks This
Every ticker page on BigEarnings shows the full earnings history with all four price windows. You can see at a glance which beats followed through and which ones faded. The AI Top Picks algorithm weighs these follow-through patterns when ranking stocks each quarter.
If a stock has beaten earnings but dropped in 3 of the last 4 quarters, that's a pattern worth knowing before you hold through the next report.
Start tracking follow-through patterns on the BigEarnings Calendar. The data will change how you think about earnings beats.