CIEN vs STK: Correlation
Measured on weekly returns over the past three years, Ciena (CIEN) and Columbia Seligman Premium Technology Growth Fund Inc (STK) carry a correlation of 0.50, a moderate link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are CIEN and STK?
On 3 years of weekly data the CIEN/STK correlation comes out at 0.50, moderate. The link has loosened recently: the 1-year correlation (0.38) runs below the 3-year figure (0.50). The 5-year figure is 0.50, and annualized covariance runs at 660.6 %².
By 3-year correlation, STK places #10 of the 28 assets tracked against CIEN. Their recent paths diverged sharply: over the last 12 months CIEN outperformed by 254.4 percentage points (+331.2% for CIEN against +76.8% for STK). One caveat on sizing: CIEN is 1.9 times as volatile as the other leg, so an equal-dollar split is far from equal-risk.
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 STK: side by side
| CIEN (Ciena) | STK (Columbia Seligman Premium Technology Growth Fund Inc) | |
|---|---|---|
| 1-year return | +331.2% | +76.8% |
| 5-year return | +598.5% | +153.2% |
| Volatility (ann.) | 50.1% | 26.4% |
| Beta vs S&P 500 | 1.59 | 1.51 |
| Max drawdown (3Y) | -47.3% | -26.6% |
| Market cap | $56.6B | – |
| P/E (trailing) | 133.7 | 5.9 |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | Information Technology | US Listed |
Year-by-year returns
| Year | CIEN | STK |
|---|---|---|
| 2022 | -33.8% | -30.4% |
| 2023 | -11.7% | +49.2% |
| 2024 | +88.4% | +17.7% |
| 2025 | +175.8% | +24.9% |
| 2026 | +71.0% | +47.2% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are CIEN and STK good diversifiers for each other?
Only partially. A correlation of 0.50 means CIEN and STK share most of their swings. Pairing them dampens volatility somewhat, but it will not protect against a common drawdown.
FAQ
What is the correlation between CIEN and STK?
As of 2026-08-27, the correlation of weekly returns between CIEN and STK is 0.50 over 3 years, 0.38 over 1 year and 0.50 over 5 years.
Is STK a good diversifier for CIEN?
Only partially. A correlation of 0.50 means CIEN and STK share most of their swings. Pairing them dampens volatility somewhat, but it will not protect against a common drawdown.
What does a correlation of 0.50 mean?
A reading of 0.50 sits on a scale from −1 (opposite moves) through 0 (unrelated) to +1 (identical moves). Correlation captures direction, not magnitude or performance.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/cien-vs-stk.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/cien-vs-stk/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: CIEN correlations · STK correlations
