PTCT vs VXZ: Correlation
PTC Therapeutics, Inc. (PTCT) and iPath Series B S&P 500 VIX Mid-Term Futures ETN (VXZ) show a negative relationship: their 3-year correlation of weekly returns is -0.33.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are PTCT and VXZ?
Over the past 3 years, PTCT and VXZ moved with a correlation of -0.33, which is negative, meaning they tend to move in opposite directions. Recent behaviour matches the longer record: -0.23 over 1 year against -0.33 over 3. Over 5 years the correlation is -0.26, and the annualized covariance of weekly returns is -448.3 %².
Out of 11 assets tracked against PTCT, VXZ lands near the bottom at #10. Their recent paths diverged sharply: over the last 12 months PTCT outperformed by 60.4 percentage points (+44.3% for PTCT against -16.1% for VXZ). Note the risk asymmetry: PTCT runs 2.1 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.
PTCT vs VXZ: side by side
| PTCT (PTC Therapeutics, Inc.) | VXZ (iPath Series B S&P 500 VIX Mid-Term Futures ETN) | |
|---|---|---|
| 1-year return | +44.3% | -16.1% |
| 5-year return | +70.4% | -53.1% |
| Volatility (ann.) | 52.5% | 25.6% |
| Beta vs S&P 500 | 1.25 | -1.31 |
| Max drawdown (3Y) | -56.8% | -36.4% |
| Market cap | $6.0B | – |
| P/E (trailing) | – | – |
| Dividend yield | 0.00% | – |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | PTCT | VXZ |
|---|---|---|
| 2022 | -4.2% | +0.5% |
| 2023 | -27.8% | -44.0% |
| 2024 | +63.8% | -12.7% |
| 2025 | +68.3% | +5.7% |
| 2026 | -5.5% | -10.5% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are PTCT and VXZ good diversifiers for each other?
Yes. With a correlation of -0.33, PTCT and VXZ have moved largely independently, which makes them a genuinely diversifying pair by historical standards.
FAQ
What is the correlation between PTCT and VXZ?
The PTCT/VXZ correlation stands at -0.33 on a 3-year window (1 year: -0.23, 5 years: -0.26), computed from weekly returns as of 2026-08-27.
Is VXZ a good diversifier for PTCT?
Yes. With a correlation of -0.33, PTCT and VXZ have moved largely independently, which makes them a genuinely diversifying pair by historical standards.
What does a correlation of -0.33 mean?
A reading of -0.33 sits on a scale from −1 (opposite moves) through 0 (unrelated) to +1 (identical moves). Correlation captures direction, not magnitude or performance.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/ptct-vs-vxz.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/ptct-vs-vxz/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: PTCT correlations · VXZ correlations
