How Will Amkor Technology Stock React To Its Upcoming Earnings?
Amkor Technology (NASDAQ:AMKR) is set to report its earnings on Monday, April 27, 2026. The company has $18 Bil in current market capitalization. Revenue over the last twelve months was $6.7 Bil, and it was operationally profitable with $467 Mil in operating profits and net income of $374 Mil. While the post-earnings stock reaction will depend on how the results and outlook stack up against investor expectations, a detailed look at historical results can aid you if you are an event-driven trader.
Here is how: either understand the historical odds and position yourself prior to the earnings announcement, or look at the correlation between immediate and medium-term returns post earnings and enter a trade one day after the announcement.
See earnings reaction history of all stocks
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Amkor Technology’s Historical Odds Of Positive Post-Earnings Return
Some observations on one-day (1D) post-earnings returns:
- There are 20 earnings data points recorded over the last five years, with 9 positive and 11 negative one-day (1D) returns observed. In summary, positive 1D returns were seen about 45% of the time.
- However, this percentage decreases to 42% if we consider data for the last 3 years instead of 5.
- Median of the 9 positive returns = 2.4%, and median of the 11 negative returns = -5.2%
Additional data for observed 5-Day (5D) and 21-Day (21D) returns post earnings are summarized along with the statistics in the table below.
| Forward Returns | |||
|---|---|---|---|
| Earnings Date | 1D | 5D | 21D |
| 2/9/2026 | 1.8% | -10.8% | -16.4% |
| 10/27/2025 | -3.1% | 14.0% | 1.9% |
| 7/28/2025 | 18.1% | 5.3% | 14.7% |
| 4/28/2025 | -2.6% | 1.7% | 5.7% |
| 2/10/2025 | -11.4% | -6.0% | -20.3% |
| 10/28/2024 | -5.2% | -11.9% | -11.0% |
| 7/29/2024 | -18.9% | -25.3% | -12.1% |
| 4/29/2024 | 2.8% | 2.9% | 3.4% |
| 2/5/2024 | -5.0% | -2.6% | 8.8% |
| 10/30/2023 | 2.1% | 15.2% | 38.7% |
| 7/31/2023 | 1.9% | -1.5% | -4.6% |
| 5/1/2023 | -5.9% | -4.4% | 10.8% |
| 2/13/2023 | 1.2% | -8.9% | -10.3% |
| 10/31/2022 | -1.4% | 4.1% | 34.8% |
| 8/1/2022 | 7.9% | 9.2% | -0.8% |
| 5/2/2022 | -5.9% | -4.8% | 4.0% |
| 2/14/2022 | 14.4% | 7.5% | 6.9% |
| 10/25/2021 | -2.9% | -0.3% | 2.1% |
| 7/26/2021 | 2.4% | 10.2% | 12.3% |
| 4/26/2021 | -11.9% | -16.6% | -14.1% |
| SUMMARY STATS | |||
| # Positive | 9 | 9 | 12 |
| # Negative | 11 | 11 | 8 |
| Median Positive | 2.4% | 7.5% | 7.9% |
| Median Negative | -5.2% | -6.0% | -11.6% |
| Max Positive | 18.1% | 15.2% | 38.7% |
| Max Negative | -18.9% | -25.3% | -20.3% |
Correlation Between 1D, 5D and 21D Historical Returns
A relatively less risky strategy (though not useful if the correlation is low) is to understand the correlation between short-term and medium-term returns post earnings, find a pair that has the highest correlation, and execute the appropriate trade. For example, if 1D and 5D show the highest correlation, a trader can position themselves “long” for the next 5 days if the 1D post-earnings return is positive. Here is some correlation data based on a 5-year and a 3-year (more recent) history. Note that the correlation 1D_5D refers to the correlation between 1D post-earnings returns and subsequent 5D returns.
| History | 1D_5D | 1D_21D | 5D_21D |
|---|---|---|---|
| 5Y History | -25.0% | -16.2% | 13.4% |
| 3Y History | -24.4% | -8.2% | 36.7% |
Is There Any Correlation With Peer Earnings?
Sometimes, peer performance can have an influence on post-earnings stock reaction. In fact, the pricing-in might begin before the earnings are announced. Here is some historical data on the past post-earnings performance of Amkor Technology stock compared with the stock performance of peers that reported earnings just before Amkor Technology. For fair comparison, peer stock returns also represent post-earnings one-day (1D) returns.
| 1D Return | Peer Post-Earnings 1D Return | |
|---|---|---|
| AMKR Earnings Dates | AMKR | LRCX |
| 2/9/2026 | 1.8% | -4.3% |
| 10/27/2025 | -3.1% | 11.1% |
| 4/28/2025 | -2.6% | 7.3% |
| 2/10/2025 | -11.4% | 11.4% |
| 10/28/2024 | -5.2% | 3.6% |
| 4/29/2024 | 2.8% | 5.0% |
| 2/5/2024 | -5.0% | 0.4% |
| 10/30/2023 | 2.1% | -9.1% |
| 7/31/2023 | 1.9% | 11.8% |
| 5/1/2023 | -5.9% | 6.7% |
| 2/13/2023 | 1.2% | 4.5% |
| 10/31/2022 | -1.4% | 22.6% |
| 8/1/2022 | 7.9% | 7.5% |
| 5/2/2022 | -5.9% | -0.4% |
| 2/14/2022 | 14.4% | -6.4% |
| 10/25/2021 | -2.9% | -2.4% |
| CORRELATION | -33.4% |
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