DAIO vs PHI: Correlation
Data I/O Corporation (DAIO) and PLDT Inc. Sponsored ADR (PHI) show a negative relationship: their 3-year correlation of weekly returns is -0.20.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are DAIO and PHI?
Over the past 3 years, DAIO and PHI moved with a correlation of -0.20, which is negative, meaning they tend to move in opposite directions. Recent behaviour matches the longer record: -0.16 over 1 year against -0.20 over 3. Over 5 years the correlation is -0.01, and the annualized covariance of weekly returns is -209.2 %².
By 3-year correlation, PHI places #10 of the 16 assets tracked against DAIO. Over the last 12 months DAIO came out ahead by 7.5 percentage points (-0.7% against -8.2%). One caveat on sizing: DAIO is 1.8 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.
DAIO vs PHI: side by side
| DAIO (Data I/O Corporation) | PHI (PLDT Inc. Sponsored ADR) | |
|---|---|---|
| 1-year return | -0.7% | -8.2% |
| 5-year return | -48.4% | -17.6% |
| Volatility (ann.) | 43.6% | 24.0% |
| Beta vs S&P 500 | 0.74 | 0.22 |
| Max drawdown (3Y) | -52.9% | -33.7% |
| Market cap | – | – |
| P/E (trailing) | – | 9.4 |
| Dividend yield | 0.00% | 494.13% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | DAIO | PHI |
|---|---|---|
| 2022 | -13.9% | -31.7% |
| 2023 | -25.9% | +11.9% |
| 2024 | -5.8% | +0.8% |
| 2025 | +14.4% | +1.5% |
| 2026 | -6.0% | -14.6% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are DAIO and PHI good diversifiers for each other?
By historical standards, yes. A correlation of -0.20 means the two rarely move for the same reasons.
FAQ
What is the correlation between DAIO and PHI?
The DAIO/PHI correlation stands at -0.20 on a 3-year window (1 year: -0.16, 5 years: -0.01), computed from weekly returns as of 2026-08-27.
Is PHI a good diversifier for DAIO?
By historical standards, yes. A correlation of -0.20 means the two rarely move for the same reasons.
What does a correlation of -0.20 mean?
On the −1 to +1 scale, -0.20 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.
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Related comparisons
Hubs: DAIO correlations · PHI correlations
