How Will Ciena Stock React To Its Upcoming Earnings?
Ciena (NYSE:CIEN) is set to report its earnings on Thursday, September 3, 2026. The company has $50 billion in current market capitalization. Revenue over the last twelve months was $5.6 billion, and it was operationally profitable with $624 million in operating profits and net income of $438 million. 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.
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Ciena’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 11 positive and 9 negative one-day (1D) returns observed. In summary, positive 1D returns were seen about 55% of the time.
- However, this percentage decreases to 45% if we consider data for the last 3 years instead of 5.
- Median of the 11 positive returns = 9.2%, and median of the 9 negative returns = -11%
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 |
| 6/4/2026 | -13.7% | -29.9% | -30.1% |
| 3/5/2026 | -12.9% | -1.0% | 30.3% |
| 12/11/2025 | 9.2% | -8.1% | 5.6% |
| 9/4/2025 | 23.3% | 37.0% | 61.0% |
| 6/5/2025 | -12.9% | -13.9% | -6.2% |
| 3/11/2025 | -2.4% | 0.2% | -17.5% |
| 12/12/2024 | 15.4% | 14.6% | 14.0% |
| 9/4/2024 | -0.8% | -4.6% | 19.3% |
| 6/6/2024 | 0.7% | 1.1% | -0.3% |
| 3/7/2024 | -14.7% | -16.8% | -23.2% |
| 12/7/2023 | 1.2% | -3.1% | 3.6% |
| 8/31/2023 | 15.8% | 11.5% | 9.5% |
| 6/6/2023 | -10.8% | -12.5% | -10.8% |
| 3/6/2023 | 3.7% | 0.9% | 6.5% |
| 12/8/2022 | 20.0% | 17.4% | 20.1% |
| 9/1/2022 | -10.4% | -13.5% | -20.3% |
| 6/2/2022 | -1.3% | -5.6% | -11.1% |
| 2/15/2022 | 7.4% | 7.9% | -9.3% |
| 12/9/2021 | 15.6% | 19.8% | 17.4% |
| 9/2/2021 | 2.9% | -2.4% | -8.2% |
| SUMMARY STATS | |||
| # Positive | 11 | 9 | 10 |
| # Negative | 9 | 11 | 10 |
| Median Positive | 9.2% | 11.5% | 15.7% |
| Median Negative | -10.8% | -8.1% | -10.9% |
| Max Positive | 23.3% | 37.0% | 61.0% |
| Max Negative | -14.7% | -29.9% | -30.1% |
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, 1D_5D shows the strongest correlation here: if the 1D post-earnings return is positive, a trader can position themselves in the same direction over the following 5D window. Here is some correlation data based on a 5-year and a 3-year (more recent) history. Note that these correlations are between subsequent windows, not the cumulative columns above: 1D_5D is the correlation between the 1D post-earnings return and the subsequent return from day 1 through day 5, 1D_21D is between the 1D return and the subsequent return from day 1 through day 21, and 5D_21D is between the 5D return and the subsequent return from day 5 through day 21.
| History | 1D_5D | 1D_21D | 5D_21D |
|---|---|---|---|
| 5Y History | 14.8% | 10.3% | 11.2% |
| 3Y History | 28.0% | 22.0% | 34.5% |
Is There Any Correlation With Peer Earnings?
Sometimes, peer performance can have an influence on post-earnings stock reaction. Some of that pricing-in may even begin before the earnings are announced. Here is some historical data on the past post-earnings performance of Ciena stock compared with the stock performance of peers that reported earnings just before Ciena. For fair comparison, peer stock returns also represent post-earnings one-day (1D) returns.
| 1D Return | Peer Post-Earnings 1D Return | ||
|---|---|---|---|
| CIEN Earnings Dates | CIEN | CSCO | ANET |
| 6/4/2026 | -13.7% | 13.4% | N/A* |
| 3/5/2026 | -12.9% | -12.3% | 4.8% |
| 12/11/2025 | 9.2% | 4.6% | N/A* |
| 9/4/2025 | 23.3% | -1.6% | N/A* |
| 6/5/2025 | -12.9% | 4.8% | N/A* |
| 3/11/2025 | -2.4% | 2.1% | -6.4% |
| 12/12/2024 | 15.4% | -2.1% | N/A* |
| 9/4/2024 | -0.8% | 6.8% | N/A* |
| 6/6/2024 | 0.7% | -2.7% | N/A* |
| 3/7/2024 | -14.7% | -2.4% | -5.5% |
| 12/7/2023 | 1.2% | -9.8% | N/A* |
| 8/31/2023 | 15.8% | 3.3% | N/A* |
| 6/6/2023 | -10.8% | 1.2% | N/A* |
| 3/6/2023 | 3.7% | 5.2% | 4.0% |
| 12/8/2022 | 20.0% | 5.0% | N/A* |
| 9/1/2022 | -10.4% | 5.8% | N/A* |
| 6/2/2022 | -1.3% | -13.7% | N/A* |
| 2/15/2022 | 7.4% | N/A* | 5.8% |
| 12/9/2021 | 15.6% | -5.5% | N/A* |
| 9/2/2021 | 2.9% | 3.8% | N/A* |
| CORRELATION | -4.5% | 43.6% | |
* N/A indicates no comparable post-earnings session for that peer in that quarter
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