PBK vs ROST: Correlation
How closely do PowerBank Corporation (PBK) and Ross Stores (ROST) trade together? Their weekly returns over three years give a correlation of -0.19, which is negative.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are PBK and ROST?
On 3 years of weekly data the PBK/ROST correlation comes out at -0.19, negative, meaning they tend to move in opposite directions. Recent behaviour matches the longer record: -0.11 over 1 year against -0.19 over 3. The 5-year figure is n/a, and annualized covariance runs at -465.4 %².
Among the 20 assets we track against PBK, ROST ranks #10 by 3-year correlation. Their recent paths diverged sharply: over the last 12 months ROST outperformed by 133.0 percentage points (-78.7% for PBK against +54.3% for ROST). One caveat on sizing: PBK is 4.0 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.
PBK vs ROST: side by side
| PBK (PowerBank Corporation) | ROST (Ross Stores) | |
|---|---|---|
| 1-year return | -78.7% | +54.3% |
| 5-year return | n/a | +105.0% |
| Volatility (ann.) | 96.0% | 24.0% |
| Beta vs S&P 500 | 0.19 | 0.66 |
| Max drawdown (3Y) | -93.7% | -21.1% |
| Market cap | – | $73.7B |
| P/E (trailing) | – | 27.8 |
| Dividend yield | 0.00% | 0.72% |
| Sector / category | US Listed | Consumer Discretionary |
Year-by-year returns
| Year | PBK | ROST |
|---|---|---|
| 2022 | – | +2.9% |
| 2023 | – | +20.6% |
| 2024 | – | +10.4% |
| 2025 | -11.7% | +20.4% |
| 2026 | -75.2% | +28.1% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are PBK and ROST good diversifiers for each other?
By historical standards, yes. A correlation of -0.19 means the two rarely move for the same reasons.
FAQ
What is the correlation between PBK and ROST?
The PBK/ROST correlation stands at -0.19 on a 3-year window (1 year: -0.11, 5 years: n/a), computed from weekly returns as of 2026-08-27.
Is ROST a good diversifier for PBK?
By historical standards, yes. A correlation of -0.19 means the two rarely move for the same reasons.
What does a correlation of -0.19 mean?
A reading of -0.19 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/pbk-vs-rost.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/pbk-vs-rost/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: PBK correlations · ROST correlations
