CIEN vs STX: Correlation
Ciena (CIEN) and Seagate Technology (STX) show a moderate relationship: their 3-year correlation of weekly returns is 0.49.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are CIEN and STX?
On 3 years of weekly data the CIEN/STX correlation comes out at 0.49, moderate. The relationship has been stable: the 1-year correlation (0.43) sits close to the 3-year figure. The 5-year figure is 0.51, and annualized covariance runs at 1250.6 %².
Among the 28 assets we track against CIEN, STX ranks #13 by 3-year correlation. Correlation aside, the last 12 months split them widely, with STX ahead by 79.6 points (+331.2% versus +410.8%). On a rolling one-year basis the correlation drifted between 0.35 and 0.66, a moderate band.
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.
CIEN vs STX: side by side
| CIEN (Ciena) | STX (Seagate Technology) | |
|---|---|---|
| 1-year return | +331.2% | +410.8% |
| 5-year return | +598.5% | +1032.5% |
| Volatility (ann.) | 50.1% | 51.3% |
| Beta vs S&P 500 | 1.59 | 1.97 |
| Max drawdown (3Y) | -47.3% | -40.0% |
| Market cap | $56.6B | $192.0B |
| P/E (trailing) | 133.7 | 61.0 |
| Dividend yield | 0.00% | 0.35% |
| Sector / category | Information Technology | Information Technology |
Year-by-year returns
| Year | CIEN | STX |
|---|---|---|
| 2022 | -33.8% | -51.4% |
| 2023 | -11.7% | +69.1% |
| 2024 | +88.4% | +4.1% |
| 2025 | +175.8% | +225.3% |
| 2026 | +71.0% | +208.4% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are CIEN and STX good diversifiers for each other?
A fair diversifier. At 0.49, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
FAQ
What is the correlation between CIEN and STX?
As of 2026-08-27, the correlation of weekly returns between CIEN and STX is 0.49 over 3 years, 0.43 over 1 year and 0.51 over 5 years.
Is STX a good diversifier for CIEN?
A fair diversifier. At 0.49, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
What does a correlation of 0.49 mean?
On the −1 to +1 scale, 0.49 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/cien-vs-stx.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/cien-vs-stx/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: CIEN correlations · STX correlations
