GLW vs RFIL: Correlation
Measured on weekly returns over the past three years, Corning Inc. (GLW) and RF Industries, Ltd. (RFIL) carry a correlation of 0.39, a moderate link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are GLW and RFIL?
Over the past 3 years, GLW and RFIL moved with a correlation of 0.39, which is moderate. Little has changed lately, as the 1-year reading of 0.46 lands near the 3-year figure. Over 5 years the correlation is 0.37, and the annualized covariance of weekly returns is 1121.1 %².
By 3-year correlation, RFIL places #20 of the 37 assets tracked against GLW. Their recent paths diverged sharply: over the last 12 months GLW outperformed by 82.3 percentage points (+129.7% for GLW against +47.4% for RFIL). Risk is not evenly split, since RFIL carries 1.6 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.
GLW vs RFIL: side by side
| GLW (Corning Inc.) | RFIL (RF Industries, Ltd.) | |
|---|---|---|
| 1-year return | +129.7% | +47.4% |
| 5-year return | +331.4% | +32.3% |
| Volatility (ann.) | 42.1% | 67.8% |
| Beta vs S&P 500 | 1.15 | 0.66 |
| Max drawdown (3Y) | -51.5% | -50.7% |
| Market cap | $131.6B | $0.1B |
| P/E (trailing) | 70.4 | 83.5 |
| Dividend yield | 0.73% | 0.00% |
| Sector / category | Information Technology | US Listed |
Year-by-year returns
| Year | GLW | RFIL |
|---|---|---|
| 2022 | -11.6% | -35.8% |
| 2023 | -1.2% | -40.9% |
| 2024 | +60.6% | +28.6% |
| 2025 | +87.8% | +47.8% |
| 2026 | +75.1% | +87.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are GLW and RFIL good diversifiers for each other?
A fair diversifier. At 0.39, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
FAQ
What is the correlation between GLW and RFIL?
As of 2026-08-27, the correlation of weekly returns between GLW and RFIL is 0.39 over 3 years, 0.46 over 1 year and 0.37 over 5 years.
Is RFIL a good diversifier for GLW?
A fair diversifier. At 0.39, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
What does a correlation of 0.39 mean?
On the −1 to +1 scale, 0.39 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: GLW correlations · RFIL correlations
