ARCT vs ZSTK: Correlation
Arcturus Therapeutics Holdings Inc. (ARCT) and ZeroStack Corp. (ZSTK) show a moderate relationship: their 3-year correlation of weekly returns is 0.48.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are ARCT and ZSTK?
Over the past 3 years, ARCT and ZSTK moved with a correlation of 0.48, which is moderate. Lately the two have moved closer together, with the 1-year correlation at 0.65 versus 0.48 over 3 years. Over 5 years the correlation is 0.35, and the annualized covariance of weekly returns is 6643.0 %².
By 3-year correlation, ZSTK places #7 of the 14 assets tracked against ARCT. The last year tells two different stories: ARCT led by 66.9 percentage points, -6.5% for ARCT against -73.4% for ZSTK. One caveat on sizing: ZSTK is 1.7 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.
ARCT vs ZSTK: side by side
| ARCT (Arcturus Therapeutics Holdings Inc.) | ZSTK (ZeroStack Corp.) | |
|---|---|---|
| 1-year return | -6.5% | -73.4% |
| 5-year return | -69.9% | -99.9% |
| Volatility (ann.) | 90.6% | 153.8% |
| Beta vs S&P 500 | 2.39 | 2.10 |
| Max drawdown (3Y) | -87.5% | -99.1% |
| Market cap | $0.5B | $0.1B |
| P/E (trailing) | – | – |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | ARCT | ZSTK |
|---|---|---|
| 2022 | -54.2% | -87.2% |
| 2023 | +85.9% | -70.4% |
| 2024 | -46.2% | -23.7% |
| 2025 | -63.9% | -84.4% |
| 2026 | +163.8% | -6.1% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are ARCT and ZSTK good diversifiers for each other?
A fair diversifier. At 0.48, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
FAQ
What is the correlation between ARCT and ZSTK?
As of 2026-08-27, the correlation of weekly returns between ARCT and ZSTK is 0.48 over 3 years, 0.65 over 1 year and 0.35 over 5 years.
Is ZSTK a good diversifier for ARCT?
A fair diversifier. At 0.48, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
What does a correlation of 0.48 mean?
On the −1 to +1 scale, 0.48 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/arct-vs-zstk.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/arct-vs-zstk/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: ARCT correlations · ZSTK correlations
