AMPH vs VXZ: Correlation
Amphastar Pharmaceuticals, Inc. (AMPH) 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 -0.25.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are AMPH and VXZ?
Over the past 3 years, AMPH and VXZ moved with a correlation of -0.25, which is negative, meaning they tend to move in opposite directions. The relationship has been stable: the 1-year correlation (-0.33) sits close to the 3-year figure. Over 5 years the correlation is -0.23, and the annualized covariance of weekly returns is -287.1 %².
Out of 13 assets tracked against AMPH, VXZ lands near the bottom at #11. Over the last 12 months VXZ came out ahead by 12.1 percentage points (-28.2% against -16.1%). Note the risk asymmetry: AMPH runs 1.7 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.
AMPH vs VXZ: side by side
| AMPH (Amphastar Pharmaceuticals, Inc.) | VXZ (iPath Series B S&P 500 VIX Mid-Term Futures ETN) | |
|---|---|---|
| 1-year return | -28.2% | -16.1% |
| 5-year return | +12.9% | -53.1% |
| Volatility (ann.) | 44.1% | 25.6% |
| Beta vs S&P 500 | 0.67 | -1.31 |
| Max drawdown (3Y) | -73.4% | -36.4% |
| Market cap | $0.9B | – |
| P/E (trailing) | 13.0 | – |
| Dividend yield | 0.00% | – |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | AMPH | VXZ |
|---|---|---|
| 2022 | +20.3% | +0.5% |
| 2023 | +120.7% | -44.0% |
| 2024 | -40.0% | -12.7% |
| 2025 | -27.9% | +5.7% |
| 2026 | -18.3% | -10.5% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are AMPH and VXZ good diversifiers for each other?
Yes: at -0.25, the two have gone their own ways historically, which is what genuine diversification looks like.
FAQ
What is the correlation between AMPH and VXZ?
As of 2026-08-27, the correlation of weekly returns between AMPH and VXZ is -0.25 over 3 years, -0.33 over 1 year and -0.23 over 5 years.
Is VXZ a good diversifier for AMPH?
Yes: at -0.25, the two have gone their own ways historically, which is what genuine diversification looks like.
What does a correlation of -0.25 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/amph-vs-vxz.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/amph-vs-vxz/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: AMPH correlations · VXZ correlations
