ACIU vs VXX: Correlation
Measured on weekly returns over the past three years, AC Immune SA (ACIU) and iPath Series B S&P 500 VIX Short-Term Futures ETN (VXX) carry a correlation of -0.29, a negative link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are ACIU and VXX?
Across a 3-year window, the weekly returns of ACIU and VXX correlate at -0.29, negative, meaning they tend to move in opposite directions. Recent behaviour matches the longer record: -0.25 over 1 year against -0.29 over 3. Stretching to 5 years gives -0.26, with an annualized covariance of -1207.9 %².
Out of 11 assets tracked against ACIU, VXX lands near the bottom at #11. The last year tells two different stories: ACIU led by 80.6 percentage points, +30.9% for ACIU 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.
ACIU vs VXX: side by side
| ACIU (AC Immune SA) | VXX (iPath Series B S&P 500 VIX Short-Term Futures ETN) | |
|---|---|---|
| 1-year return | +30.9% | -49.7% |
| 5-year return | -61.2% | -95.6% |
| Volatility (ann.) | 69.0% | 60.9% |
| Beta vs S&P 500 | 1.20 | -3.31 |
| Max drawdown (3Y) | -70.4% | -83.3% |
| Market cap | $0.3B | – |
| P/E (trailing) | – | – |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | ACIU | VXX |
|---|---|---|
| 2022 | -58.8% | -23.8% |
| 2023 | +145.1% | -72.5% |
| 2024 | -46.0% | -26.2% |
| 2025 | +16.3% | -42.2% |
| 2026 | -13.7% | -31.6% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are ACIU and VXX good diversifiers for each other?
Yes: at -0.29, the two have gone their own ways historically, which is what genuine diversification looks like.
FAQ
What is the correlation between ACIU and VXX?
As of 2026-08-27, the correlation of weekly returns between ACIU and VXX is -0.29 over 3 years, -0.25 over 1 year and -0.26 over 5 years.
Is VXX a good diversifier for ACIU?
Yes: at -0.29, the two have gone their own ways historically, which is what genuine diversification looks like.
What does a correlation of -0.29 mean?
On the −1 to +1 scale, -0.29 describes how much the two returns move together: +1 is lockstep, 0 is independence, negative values mean opposite directions. It says nothing about which performed better.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/aciu-vs-vxx.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/aciu-vs-vxx/)
Free with attribution; caching and terms are described in the API documentation.
Related comparisons
Hubs: ACIU correlations · VXX correlations
