ERII vs VXX: Correlation
Energy Recovery, Inc. (ERII) and iPath Series B S&P 500 VIX Short-Term Futures ETN (VXX) show a negative relationship: their 3-year correlation of weekly returns is -0.31.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are ERII and VXX?
On 3 years of weekly data the ERII/VXX correlation comes out at -0.31, negative, meaning they tend to move in opposite directions. Lately the two have moved closer together, with the 1-year correlation at -0.20 versus -0.31 over 3 years. The 5-year figure is -0.33, and annualized covariance runs at -959.5 %².
VXX is close to the least connected end of ERII's tracked universe, ranking #9 of 11. Twelve-month performance is nearly a tie, at -45.8% for ERII and -49.7% for VXX.
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 VXX: side by side
| ERII (Energy Recovery, Inc.) | VXX (iPath Series B S&P 500 VIX Short-Term Futures ETN) | |
|---|---|---|
| 1-year return | -45.8% | -49.7% |
| 5-year return | -60.7% | -95.6% |
| Volatility (ann.) | 51.2% | 60.9% |
| Beta vs S&P 500 | 1.44 | -3.31 |
| Max drawdown (3Y) | -72.4% | -83.3% |
| Market cap | $0.4B | – |
| P/E (trailing) | 30.4 | – |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | ERII | VXX |
|---|---|---|
| 2022 | -4.7% | -23.8% |
| 2023 | -8.1% | -72.5% |
| 2024 | -22.0% | -26.2% |
| 2025 | -8.2% | -42.2% |
| 2026 | -41.4% | -31.6% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are ERII and VXX good diversifiers for each other?
By historical standards, yes. A correlation of -0.31 means the two rarely move for the same reasons.
FAQ
What is the correlation between ERII and VXX?
The ERII/VXX correlation stands at -0.31 on a 3-year window (1 year: -0.20, 5 years: -0.33), computed from weekly returns as of 2026-08-27.
Is VXX a good diversifier for ERII?
By historical standards, yes. A correlation of -0.31 means the two rarely move for the same reasons.
What does a correlation of -0.31 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-vxx.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/erii-vs-vxx/)
Free with attribution; caching and terms are described in the API documentation.
Related comparisons
Hubs: ERII correlations · VXX correlations
