ERII vs WD: Correlation
Measured on weekly returns over the past three years, Energy Recovery, Inc. (ERII) and Walker & Dunlop, Inc (WD) carry a correlation of 0.52, a moderate link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are ERII and WD?
Across a 3-year window, the weekly returns of ERII and WD correlate at 0.52, moderate. Little has changed lately, as the 1-year reading of 0.60 lands near the 3-year figure. Stretching to 5 years gives 0.52, with an annualized covariance of 1023.1 %².
In ERII's tracked universe of 11 assets, WD sits right near the top at #1. Over the last 12 months ERII came out ahead by 5.2 percentage points (-45.8% against -51.0%).
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 WD: side by side
| ERII (Energy Recovery, Inc.) | WD (Walker & Dunlop, Inc) | |
|---|---|---|
| 1-year return | -45.8% | -51.0% |
| 5-year return | -60.7% | -53.5% |
| Volatility (ann.) | 51.2% | 38.5% |
| Beta vs S&P 500 | 1.44 | 1.12 |
| Max drawdown (3Y) | -72.4% | -63.4% |
| Market cap | $0.4B | $1.4B |
| P/E (trailing) | 30.4 | 36.0 |
| Dividend yield | 0.00% | 6.70% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | ERII | WD |
|---|---|---|
| 2022 | -4.7% | -46.8% |
| 2023 | -8.1% | +46.0% |
| 2024 | -22.0% | -10.1% |
| 2025 | -8.2% | -35.9% |
| 2026 | -41.4% | -29.9% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are ERII and WD good diversifiers for each other?
To a limited degree. At 0.52 the two still catch most of the same waves, so the pair smooths returns a little without insulating either from a shared selloff.
FAQ
What is the correlation between ERII and WD?
As of 2026-08-27, the correlation of weekly returns between ERII and WD is 0.52 over 3 years, 0.60 over 1 year and 0.52 over 5 years.
Is WD a good diversifier for ERII?
To a limited degree. At 0.52 the two still catch most of the same waves, so the pair smooths returns a little without insulating either from a shared selloff.
What does a correlation of 0.52 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.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/erii-vs-wd.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/erii-vs-wd/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: ERII correlations · WD correlations
