ERNA vs SPY: Correlation
Measured on weekly returns over the past three years, Ernexa Therapeutics Inc. (ERNA) and SPDR S&P 500 ETF Trust (SPY) carry a correlation of 0.18, a weak link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are ERNA and SPY?
Over the past 3 years, ERNA and SPY moved with a correlation of 0.18, which is weak. Little has changed lately, as the 1-year reading of 0.22 lands near the 3-year figure. Over 5 years the correlation is 0.22, and the annualized covariance of weekly returns is 337.8 %².
Among the 14 assets we track against ERNA, SPY ranks #7 by 3-year correlation. Their recent paths diverged sharply: over the last 12 months SPY outperformed by 107.0 percentage points (-86.4% for ERNA against +20.6% for SPY). Risk is not evenly split, since ERNA carries 9.0 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.
ERNA vs SPY: side by side
| ERNA (Ernexa Therapeutics Inc.) | SPY (SPDR S&P 500 ETF Trust) | |
|---|---|---|
| 1-year return | -86.4% | +20.6% |
| 5-year return | -100.0% | +82.4% |
| Volatility (ann.) | 131.2% | 14.5% |
| Beta vs S&P 500 | 1.62 | 1.00 |
| Max drawdown (3Y) | -99.7% | -18.8% |
| Market cap | – | – |
| P/E (trailing) | – | – |
| 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 | ERNA | SPY |
|---|---|---|
| 2022 | -96.1% | -18.2% |
| 2023 | -44.1% | +26.2% |
| 2024 | -83.9% | +24.9% |
| 2025 | -72.4% | +17.7% |
| 2026 | -84.2% | +13.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are ERNA and SPY good diversifiers for each other?
Yes. With a correlation of 0.18, ERNA and SPY have moved largely independently, which makes them a genuinely diversifying pair by historical standards.
FAQ
What is the correlation between ERNA and SPY?
The ERNA/SPY correlation stands at 0.18 on a 3-year window (1 year: 0.22, 5 years: 0.22), computed from weekly returns as of 2026-08-27.
Is SPY a good diversifier for ERNA?
Yes. With a correlation of 0.18, ERNA and SPY have moved largely independently, which makes them a genuinely diversifying pair by historical standards.
What does a correlation of 0.18 mean?
Correlation ranges from −1 to +1. Values near +1 mean two assets move together, near 0 that they move independently, and negative values that they tend to move in opposite directions. It measures co-movement, not performance.
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Related comparisons
Hubs: ERNA correlations · SPY correlations
