TMDX vs VXX: Correlation
Measured on weekly returns over the past three years, TransMedics Group, Inc. (TMDX) and iPath Series B S&P 500 VIX Short-Term Futures ETN (VXX) carry a correlation of -0.23, a negative link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are TMDX and VXX?
Across a 3-year window, the weekly returns of TMDX and VXX correlate at -0.23, negative, meaning they tend to move in opposite directions. The link has loosened recently: the 1-year correlation (-0.36) runs below the 3-year figure (-0.23). Stretching to 5 years gives -0.24, with an annualized covariance of -964.7 %².
VXX is close to the least connected end of TMDX's tracked universe, ranking #8 of 10. Correlation aside, the last 12 months split them widely, with TMDX ahead by 27.9 points (-21.8% versus -49.7%).
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.
TMDX vs VXX: side by side
| TMDX (TransMedics Group, Inc.) | VXX (iPath Series B S&P 500 VIX Short-Term Futures ETN) | |
|---|---|---|
| 1-year return | -21.8% | -49.7% |
| 5-year return | +196.3% | -95.6% |
| Volatility (ann.) | 69.5% | 60.9% |
| Beta vs S&P 500 | 1.37 | -3.31 |
| Max drawdown (3Y) | -67.8% | -83.3% |
| Market cap | $3.2B | – |
| P/E (trailing) | 23.9 | – |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | TMDX | VXX |
|---|---|---|
| 2022 | +222.1% | -23.8% |
| 2023 | +27.9% | -72.5% |
| 2024 | -21.0% | -26.2% |
| 2025 | +95.1% | -42.2% |
| 2026 | -24.6% | -31.6% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are TMDX and VXX good diversifiers for each other?
By historical standards, yes. A correlation of -0.23 means the two rarely move for the same reasons.
FAQ
What is the correlation between TMDX and VXX?
As of 2026-08-27, the correlation of weekly returns between TMDX and VXX is -0.23 over 3 years, -0.36 over 1 year and -0.24 over 5 years.
Is VXX a good diversifier for TMDX?
By historical standards, yes. A correlation of -0.23 means the two rarely move for the same reasons.
What does a correlation of -0.23 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/tmdx-vs-vxx.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/tmdx-vs-vxx/)
Free with attribution; caching and terms are described in the API documentation.
Related comparisons
Hubs: TMDX correlations · VXX correlations
