RMBS vs SO: Correlation
Measured on weekly returns over the past three years, Rambus, Inc. (RMBS) and Southern Company (SO) carry a correlation of -0.26, a negative link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are RMBS and SO?
On 3 years of weekly data the RMBS/SO correlation comes out at -0.26, negative, meaning they tend to move in opposite directions. Little has changed lately, as the 1-year reading of -0.29 lands near the 3-year figure. The 5-year figure is -0.13, and annualized covariance runs at -250.7 %².
Among the 12 assets we track against RMBS, SO sits near the bottom by co-movement, at rank #9. The last year tells two different stories: RMBS led by 22.8 percentage points, +21.4% for RMBS against -1.4% for SO. Risk is not evenly split, since RMBS carries 3.6 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.
RMBS vs SO: side by side
| RMBS (Rambus, Inc.) | SO (Southern Company) | |
|---|---|---|
| 1-year return | +21.4% | -1.4% |
| 5-year return | +269.6% | +62.6% |
| Volatility (ann.) | 59.1% | 16.5% |
| Beta vs S&P 500 | 2.22 | -0.02 |
| Max drawdown (3Y) | -51.5% | -15.0% |
| Market cap | $9.9B | $102.4B |
| P/E (trailing) | 41.4 | 21.7 |
| Dividend yield | 0.00% | 3.32% |
| Sector / category | US Listed | Utilities |
Year-by-year returns
| Year | RMBS | SO |
|---|---|---|
| 2022 | +21.9% | +8.2% |
| 2023 | +90.5% | +2.2% |
| 2024 | -22.5% | +21.7% |
| 2025 | +73.8% | +9.5% |
| 2026 | -0.8% | +4.6% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are RMBS and SO good diversifiers for each other?
Yes: at -0.26, the two have gone their own ways historically, which is what genuine diversification looks like.
FAQ
What is the correlation between RMBS and SO?
The RMBS/SO correlation stands at -0.26 on a 3-year window (1 year: -0.29, 5 years: -0.13), computed from weekly returns as of 2026-08-27.
Is SO a good diversifier for RMBS?
Yes: at -0.26, the two have gone their own ways historically, which is what genuine diversification looks like.
What does a correlation of -0.26 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: RMBS correlations · SO correlations
