CLWT vs SPY: Correlation
Euro Tech Holdings Company Limited (CLWT) and SPDR S&P 500 ETF Trust (SPY) show a weak relationship: their 3-year correlation of weekly returns is 0.12.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are CLWT and SPY?
Over the past 3 years, CLWT and SPY moved with a correlation of 0.12, which is weak. Little has changed lately, as the 1-year reading of 0.15 lands near the 3-year figure. Over 5 years the correlation is 0.22, and the annualized covariance of weekly returns is 84.0 %².
Within CLWT's tracked universe of 16 assets, SPY comes in at #8 by 3-year correlation. Their 12-month results are close: +22.4% for CLWT against +20.6% for SPY. Note the risk asymmetry: CLWT runs 3.4 times the annualized volatility of the other leg, so equal-weighting the two is not an equal-risk position.
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.
CLWT vs SPY: side by side
| CLWT (Euro Tech Holdings Company Limited) | SPY (SPDR S&P 500 ETF Trust) | |
|---|---|---|
| 1-year return | +22.4% | +20.6% |
| 5-year return | -52.6% | +82.4% |
| Volatility (ann.) | 49.8% | 14.5% |
| Beta vs S&P 500 | 0.40 | 1.00 |
| Max drawdown (3Y) | -44.3% | -18.8% |
| Market cap | – | – |
| P/E (trailing) | 83.2 | – |
| Dividend yield | 0.00% | 1.01% |
| Expense ratio | – | 0.09% |
| Assets under management | – | $795.3B |
| Sector / category | US Listed | ETF · US Large Cap |
SPY is a Large Blend fund from State Street Investment Management: $795.3B under management, 504 holdings, a 0.09% expense ratio, a 1.01% trailing dividend yield.
Year-by-year returns
| Year | CLWT | SPY |
|---|---|---|
| 2022 | -53.6% | -18.2% |
| 2023 | +14.7% | +26.2% |
| 2024 | -11.2% | +24.9% |
| 2025 | -13.7% | +17.7% |
| 2026 | +38.7% | +13.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are CLWT and SPY good diversifiers for each other?
Yes: at 0.12, the two have gone their own ways historically, which is what genuine diversification looks like.
FAQ
What is the correlation between CLWT and SPY?
The CLWT/SPY correlation stands at 0.12 on a 3-year window (1 year: 0.15, 5 years: 0.22), computed from weekly returns as of 2026-08-27.
Is SPY a good diversifier for CLWT?
Yes: at 0.12, the two have gone their own ways historically, which is what genuine diversification looks like.
What does a correlation of 0.12 mean?
On the −1 to +1 scale, 0.12 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.
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Related comparisons
Hubs: CLWT correlations · SPY correlations
