BRTX vs SPY: Correlation
How closely do BioRestorative Therapies, Inc. (BRTX) and SPDR S&P 500 ETF Trust (SPY) 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 BRTX and SPY?
Across a 3-year window, the weekly returns of BRTX and SPY correlate at 0.15, weak. Little has changed lately, as the 1-year reading of 0.11 lands near the 3-year figure. Stretching to 5 years gives 0.15, with an annualized covariance of 265.1 %².
SPY is close to the least connected end of BRTX's tracked universe, ranking #7 of 10. Their recent paths diverged sharply: over the last 12 months SPY outperformed by 107.4 percentage points (-86.8% for BRTX against +20.6% for SPY). Note the risk asymmetry: BRTX runs 8.7 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.
BRTX vs SPY: side by side
| BRTX (BioRestorative Therapies, Inc.) | SPY (SPDR S&P 500 ETF Trust) | |
|---|---|---|
| 1-year return | -86.8% | +20.6% |
| 5-year return | -98.4% | +82.4% |
| Volatility (ann.) | 125.6% | 14.5% |
| Beta vs S&P 500 | 1.27 | 1.00 |
| Max drawdown (3Y) | -95.1% | -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 | BRTX | SPY |
|---|---|---|
| 2022 | -36.6% | -18.2% |
| 2023 | -36.7% | +26.2% |
| 2024 | -17.8% | +24.9% |
| 2025 | -17.8% | +17.7% |
| 2026 | -82.5% | +13.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are BRTX and SPY 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 BRTX and SPY?
Using weekly returns as of 2026-08-27: 0.15 over 3 years, with 0.11 over the last year and 0.15 over 5 years.
Is SPY a good diversifier for BRTX?
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?
On the −1 to +1 scale, 0.15 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
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Related comparisons
Hubs: BRTX correlations · SPY correlations
