PPSI vs STK: Correlation
Measured on weekly returns over the past three years, Pioneer Power Solutions, Inc. (PPSI) and Columbia Seligman Premium Technology Growth Fund Inc (STK) carry a correlation of 0.47, a moderate link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are PPSI and STK?
Across a 3-year window, the weekly returns of PPSI and STK correlate at 0.47, moderate. Little has changed lately, as the 1-year reading of 0.55 lands near the 3-year figure. Stretching to 5 years gives 0.33, with an annualized covariance of 853.8 %².
STK is one of the assets that tracks PPSI most closely: it ranks #2 out of the 10 assets we track against PPSI. Correlation aside, the last 12 months split them widely, with STK ahead by 91.3 points (-14.5% versus +76.8%). One caveat on sizing: PPSI is 2.6 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.
PPSI vs STK: side by side
| PPSI (Pioneer Power Solutions, Inc.) | STK (Columbia Seligman Premium Technology Growth Fund Inc) | |
|---|---|---|
| 1-year return | -14.5% | +76.8% |
| 5-year return | -7.2% | +153.2% |
| Volatility (ann.) | 68.8% | 26.4% |
| Beta vs S&P 500 | 2.08 | 1.51 |
| Max drawdown (3Y) | -62.6% | -26.6% |
| Market cap | – | – |
| P/E (trailing) | – | 5.9 |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | PPSI | STK |
|---|---|---|
| 2022 | -64.3% | -30.4% |
| 2023 | +153.4% | +49.2% |
| 2024 | -19.4% | +17.7% |
| 2025 | +14.5% | +24.9% |
| 2026 | -37.8% | +47.2% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are PPSI and STK good diversifiers for each other?
Reasonably. At 0.47, PPSI and STK keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
FAQ
What is the correlation between PPSI and STK?
As of 2026-08-27, the correlation of weekly returns between PPSI and STK is 0.47 over 3 years, 0.55 over 1 year and 0.33 over 5 years.
Is STK a good diversifier for PPSI?
Reasonably. At 0.47, PPSI and STK keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
What does a correlation of 0.47 mean?
On the −1 to +1 scale, 0.47 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/ppsi-vs-stk.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/ppsi-vs-stk/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: PPSI correlations · STK correlations
