ACFN vs APPF: Correlation
Acorn Energy, Inc. (ACFN) and AppFolio, Inc. (APPF) show a moderate relationship: their 3-year correlation of weekly returns is 0.33.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are ACFN and APPF?
Over the past 3 years, ACFN and APPF moved with a correlation of 0.33, which is moderate. Lately the two have drifted apart, with the 1-year correlation at 0.10 versus 0.33 over 3 years. Over 5 years the correlation is 0.23, and the annualized covariance of weekly returns is 1120.5 %².
Within ACFN's tracked universe of 14 assets, APPF comes in at #4 by 3-year correlation. The trailing year gives APPF the advantage: -27.0% versus -16.0%, a 11.0-point spread. Risk is not evenly split, since ACFN carries 2.0 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.
ACFN vs APPF: side by side
| ACFN (Acorn Energy, Inc.) | APPF (AppFolio, Inc.) | |
|---|---|---|
| 1-year return | -27.0% | -16.0% |
| 5-year return | +122.5% | +93.0% |
| Volatility (ann.) | 81.3% | 41.6% |
| Beta vs S&P 500 | 0.68 | 0.64 |
| Max drawdown (3Y) | -58.1% | -55.4% |
| Market cap | $0.1B | $8.2B |
| P/E (trailing) | 33.9 | 50.8 |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | ACFN | APPF |
|---|---|---|
| 2022 | -44.4% | -13.0% |
| 2023 | +8.8% | +64.4% |
| 2024 | +193.8% | +42.4% |
| 2025 | -15.6% | -5.7% |
| 2026 | +36.8% | -0.3% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are ACFN and APPF good diversifiers for each other?
Reasonably. At 0.33, ACFN and APPF keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
FAQ
What is the correlation between ACFN and APPF?
As of 2026-08-27, the correlation of weekly returns between ACFN and APPF is 0.33 over 3 years, 0.10 over 1 year and 0.23 over 5 years.
Is APPF a good diversifier for ACFN?
Reasonably. At 0.33, ACFN and APPF keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
What does a correlation of 0.33 mean?
On the −1 to +1 scale, 0.33 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/acfn-vs-appf.json
Markdown for the live badge, attribution link included:
[](https://www.pairbook.io/pair/acfn-vs-appf/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: ACFN correlations · APPF correlations
