SPY vs STXS: Correlation
How closely do SPDR S&P 500 ETF Trust (SPY) and Stereotaxis, Inc. (STXS) trade together? Their weekly returns over three years give a correlation of 0.30, which is moderate.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are SPY and STXS?
Across a 3-year window, the weekly returns of SPY and STXS correlate at 0.30, moderate. The link has tightened recently: the 1-year correlation (0.48) runs above the 3-year figure (0.30). Stretching to 5 years gives 0.37, with an annualized covariance of 224.0 %².
By 3-year correlation, STXS places #2244 of the 4755 assets tracked against SPY. Correlation aside, the last 12 months split them widely, with SPY ahead by 69.4 points (+20.6% versus -48.8%). Risk is not evenly split, since STXS carries 3.6 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.
SPY vs STXS: side by side
| SPY (SPDR S&P 500 ETF Trust) | STXS (Stereotaxis, Inc.) | |
|---|---|---|
| 1-year return | +20.6% | -48.8% |
| 5-year return | +82.4% | -76.8% |
| Volatility (ann.) | 14.5% | 51.7% |
| Beta vs S&P 500 | 1.00 | 1.07 |
| Max drawdown (3Y) | -18.8% | -64.7% |
| 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 |
On the fund side, SPY sits in the Large Blend category at State Street Investment Management, with $795.3B under management, 504 holdings, a 0.09% expense ratio, a 1.01% trailing dividend yield.
Year-by-year returns
| Year | SPY | STXS |
|---|---|---|
| 2022 | -18.2% | -66.6% |
| 2023 | +26.2% | -15.5% |
| 2024 | +24.9% | +30.3% |
| 2025 | +17.7% | +0.9% |
| 2026 | +13.7% | -36.1% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are SPY and STXS good diversifiers for each other?
Yes, to a useful degree: a correlation of 0.30 leaves real independence between the two, which historically damped combined volatility.
FAQ
What is the correlation between SPY and STXS?
The SPY/STXS correlation stands at 0.30 on a 3-year window (1 year: 0.48, 5 years: 0.37), computed from weekly returns as of 2026-08-27.
Is STXS a good diversifier for SPY?
Yes, to a useful degree: a correlation of 0.30 leaves real independence between the two, which historically damped combined volatility.
What does a correlation of 0.30 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: SPY correlations · STXS correlations
