NPKI vs VXX: Correlation
Measured on weekly returns over the past three years, NPK International Inc. (NPKI) and iPath Series B S&P 500 VIX Short-Term Futures ETN (VXX) carry a correlation of -0.36, a negative link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are NPKI and VXX?
Over the past 3 years, NPKI and VXX moved with a correlation of -0.36, which is negative, meaning they tend to move in opposite directions. The link has tightened recently: the 1-year correlation (-0.18) runs above the 3-year figure (-0.36). Over 5 years the correlation is -0.27, and the annualized covariance of weekly returns is -909.9 %².
VXX is close to the least connected end of NPKI's tracked universe, ranking #14 of 15. The last year tells two different stories: NPKI led by 81.3 percentage points, +31.6% for NPKI against -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.
NPKI vs VXX: side by side
| NPKI (NPK International Inc.) | VXX (iPath Series B S&P 500 VIX Short-Term Futures ETN) | |
|---|---|---|
| 1-year return | +31.6% | -49.7% |
| 5-year return | +429.3% | -95.6% |
| Volatility (ann.) | 41.0% | 60.9% |
| Beta vs S&P 500 | 0.88 | -3.31 |
| Max drawdown (3Y) | -42.1% | -83.3% |
| Market cap | $1.2B | – |
| P/E (trailing) | 28.8 | – |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | NPKI | VXX |
|---|---|---|
| 2022 | +41.2% | -23.8% |
| 2023 | +60.0% | -72.5% |
| 2024 | +15.5% | -26.2% |
| 2025 | +55.4% | -42.2% |
| 2026 | +13.7% | -31.6% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are NPKI and VXX good diversifiers for each other?
By historical standards, yes. A correlation of -0.36 means the two rarely move for the same reasons.
FAQ
What is the correlation between NPKI and VXX?
As of 2026-08-27, the correlation of weekly returns between NPKI and VXX is -0.36 over 3 years, -0.18 over 1 year and -0.27 over 5 years.
Is VXX a good diversifier for NPKI?
By historical standards, yes. A correlation of -0.36 means the two rarely move for the same reasons.
What does a correlation of -0.36 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/npki-vs-vxx.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/npki-vs-vxx/)
Free with attribution; caching and terms are described in the API documentation.
Related comparisons
Hubs: NPKI correlations · VXX correlations
