SPY vs SRTS: Correlation
SPDR S&P 500 ETF Trust (SPY) and Sensus Healthcare, Inc. (SRTS) show a weak relationship: their 3-year correlation of weekly returns is 0.15.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are SPY and SRTS?
Over the past 3 years, SPY and SRTS moved with a correlation of 0.15, which is weak. The past 12 months show a weaker link (0.03) than the 3-year average (0.15). Over 5 years the correlation is 0.24, and the annualized covariance of weekly returns is 161.1 %².
Within SPY's tracked universe of 4755 assets, SRTS comes in at #3737 by 3-year correlation. Over the last 12 months SPY came out ahead by 14.6 percentage points (+20.6% against +6.0%). One caveat on sizing: SRTS is 5.1 times as volatile as the other leg, so an equal-dollar split is far from equal-risk.
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.
SPY vs SRTS: side by side
| SPY (SPDR S&P 500 ETF Trust) | SRTS (Sensus Healthcare, Inc.) | |
|---|---|---|
| 1-year return | +20.6% | +6.0% |
| 5-year return | +82.4% | -7.4% |
| Volatility (ann.) | 14.5% | 74.0% |
| Beta vs S&P 500 | 1.00 | 0.77 |
| Max drawdown (3Y) | -18.8% | -70.1% |
| Market cap | – | $0.1B |
| P/E (trailing) | – | – |
| Dividend yield | 1.01% | 0.00% |
| Expense ratio | 0.09% | – |
| Assets under management | $795.3B | – |
| Sector / category | ETF · US Large Cap | US Listed |
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 | SPY | SRTS |
|---|---|---|
| 2022 | -18.2% | +2.8% |
| 2023 | +26.2% | -68.2% |
| 2024 | +24.9% | +193.2% |
| 2025 | +17.7% | -42.5% |
| 2026 | +13.7% | -15.3% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are SPY and SRTS good diversifiers for each other?
Yes. With a correlation of 0.15, SPY and SRTS have moved largely independently, which makes them a genuinely diversifying pair by historical standards.
FAQ
What is the correlation between SPY and SRTS?
As of 2026-08-27, the correlation of weekly returns between SPY and SRTS is 0.15 over 3 years, 0.03 over 1 year and 0.24 over 5 years.
Is SRTS a good diversifier for SPY?
Yes. With a correlation of 0.15, SPY and SRTS have moved largely independently, which makes them a genuinely diversifying pair by historical standards.
What does a correlation of 0.15 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.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/spy-vs-srts.json
Markdown for the live badge, attribution link included:
[](https://www.pairbook.io/pair/spy-vs-srts/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: SPY correlations · SRTS correlations
