EFOI vs MAAS: Correlation
How closely do Energy Focus, Inc. (EFOI) and Maase Inc. - Class A (MAAS) trade together? Their weekly returns over three years give a correlation of 0.36, which is moderate.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are EFOI and MAAS?
Over the past 3 years, EFOI and MAAS moved with a correlation of 0.36, which is moderate. The past 12 months show a tighter link (0.64) than the 3-year average (0.36). Over 5 years the correlation is 0.29, and the annualized covariance of weekly returns is 7294.6 %².
By 3-year correlation, MAAS places #9 of the 17 assets tracked against EFOI. Correlation aside, the last 12 months split them widely, with MAAS ahead by 295.2 points (+13.2% versus +308.4%).
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.
EFOI vs MAAS: side by side
| EFOI (Energy Focus, Inc.) | MAAS (Maase Inc. - Class A) | |
|---|---|---|
| 1-year return | +13.2% | +308.4% |
| 5-year return | -87.5% | -94.5% |
| Volatility (ann.) | 158.7% | 126.1% |
| Beta vs S&P 500 | 1.96 | 1.00 |
| Max drawdown (3Y) | -58.2% | -99.6% |
| Market cap | – | $7.3B |
| P/E (trailing) | – | – |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | EFOI | MAAS |
|---|---|---|
| 2022 | -92.5% | +14.9% |
| 2023 | -32.6% | -19.2% |
| 2024 | -21.2% | -94.6% |
| 2025 | +94.1% | -73.1% |
| 2026 | +25.5% | +206.3% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are EFOI and MAAS good diversifiers for each other?
Yes, to a useful degree: a correlation of 0.36 leaves real independence between the two, which historically damped combined volatility.
FAQ
What is the correlation between EFOI and MAAS?
The EFOI/MAAS correlation stands at 0.36 on a 3-year window (1 year: 0.64, 5 years: 0.29), computed from weekly returns as of 2026-08-27.
Is MAAS a good diversifier for EFOI?
Yes, to a useful degree: a correlation of 0.36 leaves real independence between the two, which historically damped combined volatility.
What does a correlation of 0.36 mean?
On the −1 to +1 scale, 0.36 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.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/efoi-vs-maas.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/efoi-vs-maas/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: EFOI correlations · MAAS correlations
