ECL vs PDEX: Correlation
Measured on weekly returns over the past three years, Ecolab (ECL) and Pro-Dex, Inc. (PDEX) carry a correlation of -0.22, a negative link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are ECL and PDEX?
On 3 years of weekly data the ECL/PDEX correlation comes out at -0.22, negative, meaning they tend to move in opposite directions. Recent behaviour matches the longer record: -0.12 over 1 year against -0.22 over 3. The 5-year figure is -0.08, and annualized covariance runs at -252.9 %².
Within ECL's tracked universe of 53 assets, PDEX comes in at #46 by 3-year correlation. Correlation aside, the last 12 months split them widely, with PDEX ahead by 39.4 points (+3.1% versus +42.5%). Risk is not evenly split, since PDEX carries 3.1 times the volatility of the other side.
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.
ECL vs PDEX: side by side
| ECL (Ecolab) | PDEX (Pro-Dex, Inc.) | |
|---|---|---|
| 1-year return | +3.1% | +42.5% |
| 5-year return | +34.0% | +152.4% |
| Volatility (ann.) | 19.5% | 59.6% |
| Beta vs S&P 500 | 0.64 | 0.17 |
| Max drawdown (3Y) | -20.1% | -65.3% |
| Market cap | $80.1B | $0.2B |
| P/E (trailing) | 39.1 | 17.5 |
| Dividend yield | 0.98% | 0.00% |
| Sector / category | Materials | US Listed |
Year-by-year returns
| Year | ECL | PDEX |
|---|---|---|
| 2022 | -37.1% | -31.5% |
| 2023 | +37.9% | +10.2% |
| 2024 | +19.3% | +166.8% |
| 2025 | +13.2% | -17.7% |
| 2026 | +9.5% | +68.6% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are ECL and PDEX good diversifiers for each other?
By historical standards, yes. A correlation of -0.22 means the two rarely move for the same reasons.
FAQ
What is the correlation between ECL and PDEX?
The ECL/PDEX correlation stands at -0.22 on a 3-year window (1 year: -0.12, 5 years: -0.08), computed from weekly returns as of 2026-08-27.
Is PDEX a good diversifier for ECL?
By historical standards, yes. A correlation of -0.22 means the two rarely move for the same reasons.
What does a correlation of -0.22 mean?
On the −1 to +1 scale, -0.22 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/ecl-vs-pdex.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/ecl-vs-pdex/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: ECL correlations · PDEX correlations
