PTCT vs VXX: Correlation
How closely do PTC Therapeutics, Inc. (PTCT) and iPath Series B S&P 500 VIX Short-Term Futures ETN (VXX) trade together? Their weekly returns over three years give a correlation of -0.34, which is negative.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are PTCT and VXX?
Over the past 3 years, PTCT and VXX moved with a correlation of -0.34, which is negative, meaning they tend to move in opposite directions. Recent behaviour matches the longer record: -0.26 over 1 year against -0.34 over 3. Over 5 years the correlation is -0.29, and the annualized covariance of weekly returns is -1101.5 %².
VXX is close to the least connected end of PTCT's tracked universe, ranking #11 of 11. Their recent paths diverged sharply: over the last 12 months PTCT outperformed by 94.0 percentage points (+44.3% for PTCT against -49.7% for VXX).
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 VXX: side by side
| PTCT (PTC Therapeutics, Inc.) | VXX (iPath Series B S&P 500 VIX Short-Term Futures ETN) | |
|---|---|---|
| 1-year return | +44.3% | -49.7% |
| 5-year return | +70.4% | -95.6% |
| Volatility (ann.) | 52.5% | 60.9% |
| Beta vs S&P 500 | 1.25 | -3.31 |
| Max drawdown (3Y) | -56.8% | -83.3% |
| Market cap | $6.0B | – |
| P/E (trailing) | – | – |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | PTCT | VXX |
|---|---|---|
| 2022 | -4.2% | -23.8% |
| 2023 | -27.8% | -72.5% |
| 2024 | +63.8% | -26.2% |
| 2025 | +68.3% | -42.2% |
| 2026 | -5.5% | -31.6% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are PTCT and VXX good diversifiers for each other?
By historical standards, yes. A correlation of -0.34 means the two rarely move for the same reasons.
FAQ
What is the correlation between PTCT and VXX?
The PTCT/VXX correlation stands at -0.34 on a 3-year window (1 year: -0.26, 5 years: -0.29), computed from weekly returns as of 2026-08-27.
Is VXX a good diversifier for PTCT?
By historical standards, yes. A correlation of -0.34 means the two rarely move for the same reasons.
What does a correlation of -0.34 mean?
A reading of -0.34 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-vxx.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/ptct-vs-vxx/)
Free with attribution; caching and terms are described in the API documentation.
Related comparisons
Hubs: PTCT correlations · VXX correlations
