ERII vs MCHX: Correlation
Measured on weekly returns over the past three years, Energy Recovery, Inc. (ERII) and Marchex, Inc. (MCHX) carry a correlation of 0.37, a moderate link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are ERII and MCHX?
On 3 years of weekly data the ERII/MCHX correlation comes out at 0.37, moderate. The past 12 months show a weaker link (0.13) than the 3-year average (0.37). The 5-year figure is 0.24, and annualized covariance runs at 946.7 %².
Among the 11 assets we track against ERII, MCHX sits near the bottom by co-movement, at rank #7. Their recent paths diverged sharply: over the last 12 months MCHX outperformed by 38.6 percentage points (-45.8% for ERII against -7.2% for MCHX).
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.
ERII vs MCHX: side by side
| ERII (Energy Recovery, Inc.) | MCHX (Marchex, Inc.) | |
|---|---|---|
| 1-year return | -45.8% | -7.2% |
| 5-year return | -60.7% | -45.3% |
| Volatility (ann.) | 51.2% | 50.3% |
| Beta vs S&P 500 | 1.44 | 1.07 |
| Max drawdown (3Y) | -72.4% | -40.5% |
| Market cap | $0.4B | $0.1B |
| P/E (trailing) | 30.4 | – |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | ERII | MCHX |
|---|---|---|
| 2022 | -4.7% | -35.5% |
| 2023 | -8.1% | -15.0% |
| 2024 | -22.0% | +28.7% |
| 2025 | -8.2% | -5.1% |
| 2026 | -41.4% | +9.0% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are ERII and MCHX good diversifiers for each other?
Reasonably. At 0.37, ERII and MCHX keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
FAQ
What is the correlation between ERII and MCHX?
As of 2026-08-27, the correlation of weekly returns between ERII and MCHX is 0.37 over 3 years, 0.13 over 1 year and 0.24 over 5 years.
Is MCHX a good diversifier for ERII?
Reasonably. At 0.37, ERII and MCHX keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
What does a correlation of 0.37 mean?
Correlation ranges from −1 to +1. Values near +1 mean two assets move together, near 0 that they move independently, and negative values that they tend to move in opposite directions. It measures co-movement, not performance.
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Related comparisons
Hubs: ERII correlations · MCHX correlations
