NAII vs WMB: Correlation
How closely do Natural Alternatives International, Inc. (NAII) and Williams Companies (WMB) trade together? Their weekly returns over three years give a correlation of -0.19, which is negative.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are NAII and WMB?
Across a 3-year window, the weekly returns of NAII and WMB correlate at -0.19, negative, meaning they tend to move in opposite directions. The link has tightened recently: the 1-year correlation (-0.04) runs above the 3-year figure (-0.19). Stretching to 5 years gives -0.09, with an annualized covariance of -228.8 %².
Among the 14 assets we track against NAII, WMB ranks #9 by 3-year correlation. Correlation aside, the last 12 months split them widely, with WMB ahead by 69.1 points (-36.0% versus +33.1%). Risk is not evenly split, since NAII carries 2.1 times the volatility of the other side.
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.
NAII vs WMB: side by side
| NAII (Natural Alternatives International, Inc.) | WMB (Williams Companies) | |
|---|---|---|
| 1-year return | -36.0% | +33.1% |
| 5-year return | -85.1% | +279.9% |
| Volatility (ann.) | 49.2% | 24.0% |
| Beta vs S&P 500 | 0.09 | 0.34 |
| Max drawdown (3Y) | -71.7% | -12.4% |
| Market cap | – | $90.7B |
| P/E (trailing) | – | 29.7 |
| Dividend yield | 0.00% | 2.76% |
| Sector / category | US Listed | Energy |
Year-by-year returns
| Year | NAII | WMB |
|---|---|---|
| 2022 | -33.7% | +32.8% |
| 2023 | -22.2% | +11.9% |
| 2024 | -34.0% | +62.3% |
| 2025 | -16.9% | +14.9% |
| 2026 | -36.0% | +25.2% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are NAII and WMB good diversifiers for each other?
Yes: at -0.19, the two have gone their own ways historically, which is what genuine diversification looks like.
FAQ
What is the correlation between NAII and WMB?
Using weekly returns as of 2026-08-27: -0.19 over 3 years, with -0.04 over the last year and -0.09 over 5 years.
Is WMB a good diversifier for NAII?
Yes: at -0.19, the two have gone their own ways historically, which is what genuine diversification looks like.
What does a correlation of -0.19 mean?
On the −1 to +1 scale, -0.19 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: NAII correlations · WMB correlations
