ELMD vs SPY: Correlation
Electromed, Inc. (ELMD) and SPDR S&P 500 ETF Trust (SPY) show a weak relationship: their 3-year correlation of weekly returns is 0.19.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are ELMD and SPY?
On 3 years of weekly data the ELMD/SPY correlation comes out at 0.19, weak. The relationship has been stable: the 1-year correlation (0.19) sits close to the 3-year figure. The 5-year figure is 0.19, and annualized covariance runs at 132.1 %².
Among the 12 assets we track against ELMD, SPY ranks #6 by 3-year correlation. Their 12-month results are close: +21.7% for ELMD against +20.6% for SPY. Note the risk asymmetry: ELMD runs 3.4 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.
ELMD vs SPY: side by side
| ELMD (Electromed, Inc.) | SPY (SPDR S&P 500 ETF Trust) | |
|---|---|---|
| 1-year return | +21.7% | +20.6% |
| 5-year return | +144.2% | +82.4% |
| Volatility (ann.) | 48.9% | 14.5% |
| Beta vs S&P 500 | 0.63 | 1.00 |
| Max drawdown (3Y) | -48.9% | -18.8% |
| Market cap | $0.3B | – |
| P/E (trailing) | 24.5 | – |
| Dividend yield | 0.00% | 1.01% |
| Expense ratio | – | 0.09% |
| Assets under management | – | $795.3B |
| Sector / category | US Listed | ETF · US Large Cap |
SPY is a Large Blend fund from State Street Investment Management: $795.3B under management, 504 holdings, a 0.09% expense ratio, a 1.01% trailing dividend yield.
Year-by-year returns
| Year | ELMD | SPY |
|---|---|---|
| 2022 | -19.3% | -18.2% |
| 2023 | +4.0% | +26.2% |
| 2024 | +170.9% | +24.9% |
| 2025 | -1.5% | +17.7% |
| 2026 | +3.5% | +13.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are ELMD and SPY good diversifiers for each other?
Yes: at 0.19, the two have gone their own ways historically, which is what genuine diversification looks like.
FAQ
What is the correlation between ELMD and SPY?
The ELMD/SPY correlation stands at 0.19 on a 3-year window (1 year: 0.19, 5 years: 0.19), computed from weekly returns as of 2026-08-27.
Is SPY a good diversifier for ELMD?
Yes: at 0.19, the two have gone their own ways historically, which is what genuine diversification looks like.
What does a correlation of 0.19 mean?
A reading of 0.19 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: ELMD correlations · SPY correlations
