PSIG vs ZSTK: Correlation
How closely do PS International Group Ltd. (PSIG) and ZeroStack Corp. (ZSTK) trade together? Their weekly returns over three years give a correlation of 0.44, which is moderate.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are PSIG and ZSTK?
Across a 3-year window, the weekly returns of PSIG and ZSTK correlate at 0.44, moderate. The link has tightened recently: the 1-year correlation (0.58) runs above the 3-year figure (0.44). Stretching to 5 years gives n/a, with an annualized covariance of 10850.7 %².
By 3-year correlation, ZSTK places #4 of the 55 assets tracked against PSIG. The last year tells two different stories: PSIG led by 19.5 percentage points, -53.9% for PSIG against -73.4% for ZSTK.
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.
PSIG vs ZSTK: side by side
| PSIG (PS International Group Ltd.) | ZSTK (ZeroStack Corp.) | |
|---|---|---|
| 1-year return | -53.9% | -73.4% |
| 5-year return | n/a | -99.9% |
| Volatility (ann.) | 157.0% | 153.8% |
| Beta vs S&P 500 | 0.97 | 2.10 |
| Max drawdown (3Y) | -96.0% | -99.1% |
| Market cap | – | $0.1B |
| P/E (trailing) | – | – |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | PSIG | ZSTK |
|---|---|---|
| 2022 | – | -87.2% |
| 2023 | – | -70.4% |
| 2024 | – | -23.7% |
| 2025 | +8.3% | -84.4% |
| 2026 | -62.9% | -6.1% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are PSIG and ZSTK good diversifiers for each other?
A fair diversifier. At 0.44, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
FAQ
What is the correlation between PSIG and ZSTK?
The PSIG/ZSTK correlation stands at 0.44 on a 3-year window (1 year: 0.58, 5 years: n/a), computed from weekly returns as of 2026-08-27.
Is ZSTK a good diversifier for PSIG?
A fair diversifier. At 0.44, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
What does a correlation of 0.44 mean?
A reading of 0.44 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/psig-vs-zstk.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/psig-vs-zstk/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: PSIG correlations · ZSTK correlations
