PDEX vs SPG: Correlation
Pro-Dex, Inc. (PDEX) and Simon Property Group (SPG) show a negative relationship: their 3-year correlation of weekly returns is -0.17.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are PDEX and SPG?
On 3 years of weekly data the PDEX/SPG correlation comes out at -0.17, negative, meaning they tend to move in opposite directions. Little has changed lately, as the 1-year reading of -0.26 lands near the 3-year figure. The 5-year figure is -0.05, and annualized covariance runs at -233.3 %².
Among the 31 assets we track against PDEX, SPG ranks #9 by 3-year correlation. Their recent paths diverged sharply: over the last 12 months PDEX outperformed by 16.2 percentage points (+42.5% for PDEX against +26.3% for SPG). Note the risk asymmetry: PDEX runs 2.6 times the annualized volatility of the other leg, so equal-weighting the two is not an equal-risk position.
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.
PDEX vs SPG: side by side
| PDEX (Pro-Dex, Inc.) | SPG (Simon Property Group) | |
|---|---|---|
| 1-year return | +42.5% | +26.3% |
| 5-year return | +152.4% | +110.2% |
| Volatility (ann.) | 59.6% | 22.7% |
| Beta vs S&P 500 | 0.17 | 0.79 |
| Max drawdown (3Y) | -65.3% | -24.3% |
| Market cap | $0.2B | $81.6B |
| P/E (trailing) | 17.5 | 15.2 |
| Dividend yield | 0.00% | 4.05% |
| Sector / category | US Listed | Real Estate |
Year-by-year returns
| Year | PDEX | SPG |
|---|---|---|
| 2022 | -31.5% | -21.9% |
| 2023 | +10.2% | +29.2% |
| 2024 | +166.8% | +26.9% |
| 2025 | -17.7% | +12.9% |
| 2026 | +68.6% | +18.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are PDEX and SPG good diversifiers for each other?
Yes. With a correlation of -0.17, PDEX and SPG have moved largely independently, which makes them a genuinely diversifying pair by historical standards.
FAQ
What is the correlation between PDEX and SPG?
The PDEX/SPG correlation stands at -0.17 on a 3-year window (1 year: -0.26, 5 years: -0.05), computed from weekly returns as of 2026-08-27.
Is SPG a good diversifier for PDEX?
Yes. With a correlation of -0.17, PDEX and SPG have moved largely independently, which makes them a genuinely diversifying pair by historical standards.
What does a correlation of -0.17 mean?
A reading of -0.17 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/pdex-vs-spg.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/pdex-vs-spg/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: PDEX correlations · SPG correlations
