PRTA vs VXZ: Correlation
How closely do Prothena Corporation plc (PRTA) and iPath Series B S&P 500 VIX Mid-Term Futures ETN (VXZ) trade together? Their weekly returns over three years give a correlation of -0.26, which is negative.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are PRTA and VXZ?
On 3 years of weekly data the PRTA/VXZ correlation comes out at -0.26, negative, meaning they tend to move in opposite directions. Lately the two have moved closer together, with the 1-year correlation at -0.11 versus -0.26 over 3 years. The 5-year figure is -0.17, and annualized covariance runs at -389.5 %².
Among the 11 assets we track against PRTA, VXZ sits near the bottom by co-movement, at rank #10. Correlation aside, the last 12 months split them widely, with PRTA ahead by 22.3 points (+6.2% versus -16.1%). One caveat on sizing: PRTA is 2.3 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.
PRTA vs VXZ: side by side
| PRTA (Prothena Corporation plc) | VXZ (iPath Series B S&P 500 VIX Mid-Term Futures ETN) | |
|---|---|---|
| 1-year return | +6.2% | -16.1% |
| 5-year return | -86.9% | -53.1% |
| Volatility (ann.) | 57.9% | 25.6% |
| Beta vs S&P 500 | 0.93 | -1.31 |
| Max drawdown (3Y) | -91.9% | -36.4% |
| Market cap | $0.5B | – |
| P/E (trailing) | – | – |
| Dividend yield | 0.00% | – |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | PRTA | VXZ |
|---|---|---|
| 2022 | +22.0% | +0.5% |
| 2023 | -39.7% | -44.0% |
| 2024 | -61.9% | -12.7% |
| 2025 | -31.0% | +5.7% |
| 2026 | -4.8% | -10.5% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are PRTA and VXZ good diversifiers for each other?
By historical standards, yes. A correlation of -0.26 means the two rarely move for the same reasons.
FAQ
What is the correlation between PRTA and VXZ?
The PRTA/VXZ correlation stands at -0.26 on a 3-year window (1 year: -0.11, 5 years: -0.17), computed from weekly returns as of 2026-08-27.
Is VXZ a good diversifier for PRTA?
By historical standards, yes. A correlation of -0.26 means the two rarely move for the same reasons.
What does a correlation of -0.26 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/prta-vs-vxz.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/prta-vs-vxz/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: PRTA correlations · VXZ correlations
