AEIS vs CIEN: Correlation
How closely do Advanced Energy Industries, Inc. (AEIS) and Ciena (CIEN) trade together? Their weekly returns over three years give a correlation of 0.51, which is moderate.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are AEIS and CIEN?
Over the past 3 years, AEIS and CIEN moved with a correlation of 0.51, which is moderate. Recent behaviour matches the longer record: 0.45 over 1 year against 0.51 over 3. Over 5 years the correlation is 0.48, and the annualized covariance of weekly returns is 1131.8 %².
Among the 32 assets we track against AEIS, CIEN ranks #21 by 3-year correlation. Correlation aside, the last 12 months split them widely, with CIEN ahead by 244.2 points (+87.0% versus +331.2%).
How is this computed?
Pearson correlation on weekly returns: ρ(A,B) = cov(rA, rB) / (σA · σB), over windows of 52, 156 and 260 weeks. Covariance is annualized (×52) and expressed in %². Full definitions on the methodology page.
AEIS vs CIEN: side by side
| AEIS (Advanced Energy Industries, Inc.) | CIEN (Ciena) | |
|---|---|---|
| 1-year return | +87.0% | +331.2% |
| 5-year return | +222.9% | +598.5% |
| Volatility (ann.) | 43.9% | 50.1% |
| Beta vs S&P 500 | 1.69 | 1.59 |
| Max drawdown (3Y) | -39.9% | -47.3% |
| Market cap | $11.5B | $56.6B |
| P/E (trailing) | 52.4 | 133.7 |
| Dividend yield | 0.14% | 0.00% |
| Sector / category | US Listed | Information Technology |
Year-by-year returns
| Year | AEIS | CIEN |
|---|---|---|
| 2022 | -5.4% | -33.8% |
| 2023 | +27.5% | -11.7% |
| 2024 | +6.6% | +88.4% |
| 2025 | +81.6% | +175.8% |
| 2026 | +37.3% | +71.0% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are AEIS and CIEN good diversifiers for each other?
Somewhat, no more. With 0.51 correlation, most large moves hit both names, and the diversification benefit stays modest.
FAQ
What is the correlation between AEIS and CIEN?
Using weekly returns as of 2026-08-27: 0.51 over 3 years, with 0.45 over the last year and 0.48 over 5 years.
Is CIEN a good diversifier for AEIS?
Somewhat, no more. With 0.51 correlation, most large moves hit both names, and the diversification benefit stays modest.
What does a correlation of 0.51 mean?
On the −1 to +1 scale, 0.51 describes how much the two returns move together: +1 is lockstep, 0 is independence, negative values mean opposite directions. It says nothing about which performed better.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/aeis-vs-cien.json
Markdown for the live badge, attribution link included:
[](https://www.pairbook.io/pair/aeis-vs-cien/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: AEIS correlations · CIEN correlations
