AEIS vs BELFA: Correlation
Advanced Energy Industries, Inc. (AEIS) and Bel Fuse Inc. (BELFA) show a moderate relationship: their 3-year correlation of weekly returns is 0.55.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are AEIS and BELFA?
Over the past 3 years, AEIS and BELFA moved with a correlation of 0.55, which is moderate. The link has tightened recently: the 1-year correlation (0.71) runs above the 3-year figure (0.55). Over 5 years the correlation is 0.47, and the annualized covariance of weekly returns is 1178.9 %².
Among the 32 assets we track against AEIS, BELFA ranks #18 by 3-year correlation. The trailing year gives AEIS the advantage: +87.0% versus +80.5%, a 6.5-point spread.
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.
AEIS vs BELFA: side by side
| AEIS (Advanced Energy Industries, Inc.) | BELFA (Bel Fuse Inc.) | |
|---|---|---|
| 1-year return | +87.0% | +80.5% |
| 5-year return | +222.9% | +1292.5% |
| Volatility (ann.) | 43.9% | 48.6% |
| Beta vs S&P 500 | 1.69 | 1.30 |
| Max drawdown (3Y) | -39.9% | -43.4% |
| Market cap | $11.5B | $3.1B |
| P/E (trailing) | 52.4 | 54.3 |
| Dividend yield | 0.14% | 0.11% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | AEIS | BELFA |
|---|---|---|
| 2022 | -5.4% | +117.0% |
| 2023 | +27.5% | +102.0% |
| 2024 | +6.6% | +39.8% |
| 2025 | +81.6% | +69.0% |
| 2026 | +37.3% | +40.6% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are AEIS and BELFA good diversifiers for each other?
To a limited degree. At 0.55 the two still catch most of the same waves, so the pair smooths returns a little without insulating either from a shared selloff.
FAQ
What is the correlation between AEIS and BELFA?
The AEIS/BELFA correlation stands at 0.55 on a 3-year window (1 year: 0.71, 5 years: 0.47), computed from weekly returns as of 2026-08-27.
Is BELFA a good diversifier for AEIS?
To a limited degree. At 0.55 the two still catch most of the same waves, so the pair smooths returns a little without insulating either from a shared selloff.
What does a correlation of 0.55 mean?
A reading of 0.55 sits on a scale from −1 (opposite moves) through 0 (unrelated) to +1 (identical moves). Correlation captures direction, not magnitude or performance.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/aeis-vs-belfa.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/aeis-vs-belfa/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: AEIS correlations · BELFA correlations
