RDGT vs SPRU: Correlation
Measured on weekly returns over the past three years, Ridgetech, Inc. (RDGT) and Spruce Power Holding Corporation (SPRU) carry a correlation of 0.38, a moderate link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are RDGT and SPRU?
On 3 years of weekly data the RDGT/SPRU correlation comes out at 0.38, moderate. Lately the two have moved closer together, with the 1-year correlation at 0.51 versus 0.38 over 3 years. The 5-year figure is 0.34, and annualized covariance runs at 3871.7 %².
SPRU is one of the assets that tracks RDGT most closely: it ranks #2 out of the 21 assets we track against RDGT. Correlation aside, the last 12 months split them widely, with SPRU ahead by 127.4 points (-99.5% versus +27.9%).
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.
RDGT vs SPRU: side by side
| RDGT (Ridgetech, Inc.) | SPRU (Spruce Power Holding Corporation) | |
|---|---|---|
| 1-year return | -99.5% | +27.9% |
| 5-year return | -100.0% | -96.5% |
| Volatility (ann.) | 120.7% | 84.6% |
| Beta vs S&P 500 | 0.28 | 1.03 |
| Max drawdown (3Y) | -99.9% | -83.1% |
| Market cap | – | – |
| P/E (trailing) | – | – |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | RDGT | SPRU |
|---|---|---|
| 2022 | -21.5% | -72.2% |
| 2023 | -93.9% | -39.9% |
| 2024 | -59.8% | -32.8% |
| 2025 | +61.0% | +71.4% |
| 2026 | -99.8% | -63.1% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are RDGT and SPRU good diversifiers for each other?
Reasonably. At 0.38, RDGT and SPRU keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
FAQ
What is the correlation between RDGT and SPRU?
The RDGT/SPRU correlation stands at 0.38 on a 3-year window (1 year: 0.51, 5 years: 0.34), computed from weekly returns as of 2026-08-27.
Is SPRU a good diversifier for RDGT?
Reasonably. At 0.38, RDGT and SPRU keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
What does a correlation of 0.38 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/rdgt-vs-spru.json
Markdown for the live badge, attribution link included:
[](https://www.pairbook.io/pair/rdgt-vs-spru/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: RDGT correlations · SPRU correlations
