EFOI vs QQQ: Correlation
How closely do Energy Focus, Inc. (EFOI) and Invesco QQQ Trust (QQQ) trade together? Their weekly returns over three years give a correlation of 0.15, which is weak.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are EFOI and QQQ?
On 3 years of weekly data the EFOI/QQQ correlation comes out at 0.15, weak. The past 12 months show a tighter link (0.30) than the 3-year average (0.15). The 5-year figure is 0.14, and annualized covariance runs at 474.2 %².
Among the 17 assets we track against EFOI, QQQ ranks #11 by 3-year correlation. Over the last 12 months QQQ came out ahead by 13.1 percentage points (+13.2% against +26.3%). Note the risk asymmetry: EFOI runs 8.1 times the annualized volatility of the other leg, so equal-weighting the two is not an equal-risk position.
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 QQQ: side by side
| EFOI (Energy Focus, Inc.) | QQQ (Invesco QQQ Trust) | |
|---|---|---|
| 1-year return | +13.2% | +26.3% |
| 5-year return | -87.5% | +95.4% |
| Volatility (ann.) | 158.7% | 19.6% |
| Beta vs S&P 500 | 1.96 | 1.28 |
| Max drawdown (3Y) | -58.2% | -22.8% |
| Market cap | – | – |
| P/E (trailing) | – | – |
| Dividend yield | 0.00% | 0.44% |
| Expense ratio | – | 0.18% |
| Assets under management | – | $452.8B |
| Sector / category | US Listed | ETF · US Growth & Tech |
QQQ is a Large Growth fund from Invesco: $452.8B under management, 104 holdings, a 0.18% expense ratio, a 0.44% trailing dividend yield.
Year-by-year returns
| Year | EFOI | QQQ |
|---|---|---|
| 2022 | -92.5% | -32.6% |
| 2023 | -32.6% | +54.9% |
| 2024 | -21.2% | +25.6% |
| 2025 | +94.1% | +20.8% |
| 2026 | +25.5% | +17.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are EFOI and QQQ good diversifiers for each other?
By historical standards, yes. A correlation of 0.15 means the two rarely move for the same reasons.
FAQ
What is the correlation between EFOI and QQQ?
The EFOI/QQQ correlation stands at 0.15 on a 3-year window (1 year: 0.30, 5 years: 0.14), computed from weekly returns as of 2026-08-27.
Is QQQ a good diversifier for EFOI?
By historical standards, yes. A correlation of 0.15 means the two rarely move for the same reasons.
What does a correlation of 0.15 mean?
A reading of 0.15 sits on a scale from −1 (opposite moves) through 0 (unrelated) to +1 (identical moves). Correlation captures direction, not magnitude or performance.
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Related comparisons
Hubs: EFOI correlations · QQQ correlations
