SPY vs VTAK: Correlation
SPDR S&P 500 ETF Trust (SPY) and Catheter Precision, Inc. (VTAK) show a weak relationship: their 3-year correlation of weekly returns is 0.13.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are SPY and VTAK?
On 3 years of weekly data the SPY/VTAK correlation comes out at 0.13, weak. Recent behaviour matches the longer record: 0.12 over 1 year against 0.13 over 3. The 5-year figure is 0.11, and annualized covariance runs at 291.3 %².
Within SPY's tracked universe of 4755 assets, VTAK comes in at #3900 by 3-year correlation. Their recent paths diverged sharply: over the last 12 months SPY outperformed by 112.3 percentage points (+20.6% for SPY against -91.7% for VTAK). Note the risk asymmetry: VTAK runs 10.5 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.
SPY vs VTAK: side by side
| SPY (SPDR S&P 500 ETF Trust) | VTAK (Catheter Precision, Inc.) | |
|---|---|---|
| 1-year return | +20.6% | -91.7% |
| 5-year return | +82.4% | -100.0% |
| Volatility (ann.) | 14.5% | 152.1% |
| Beta vs S&P 500 | 1.00 | 1.39 |
| Max drawdown (3Y) | -18.8% | -99.8% |
| Market cap | – | – |
| 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, State Street Investment Management's Large Blend fund, carries $795.3B under management, 504 holdings, a 0.09% expense ratio, a 1.01% trailing dividend yield.
Year-by-year returns
| Year | SPY | VTAK |
|---|---|---|
| 2022 | -18.2% | -92.4% |
| 2023 | +26.2% | -93.2% |
| 2024 | +24.9% | -88.7% |
| 2025 | +17.7% | -78.6% |
| 2026 | +13.7% | -88.9% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are SPY and VTAK good diversifiers for each other?
Yes: at 0.13, the two have gone their own ways historically, which is what genuine diversification looks like.
FAQ
What is the correlation between SPY and VTAK?
Using weekly returns as of 2026-08-27: 0.13 over 3 years, with 0.12 over the last year and 0.11 over 5 years.
Is VTAK a good diversifier for SPY?
Yes: at 0.13, the two have gone their own ways historically, which is what genuine diversification looks like.
What does a correlation of 0.13 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-vtak.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/spy-vs-vtak/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: SPY correlations · VTAK correlations
