RDI vs SPY: Correlation
How closely do Reading International Inc - Class A Non-voting (RDI) and SPDR S&P 500 ETF Trust (SPY) trade together? Their weekly returns over three years give a correlation of 0.08, which is near-zero.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are RDI and SPY?
On 3 years of weekly data the RDI/SPY correlation comes out at 0.08, near zero, meaning they move largely independently. Recent behaviour matches the longer record: 0.08 over 1 year against 0.08 over 3. The 5-year figure is 0.22, and annualized covariance runs at 54.0 %².
Out of 10 assets tracked against RDI, SPY lands near the bottom at #6. Their recent paths diverged sharply: over the last 12 months RDI outperformed by 15.8 percentage points (+36.4% for RDI against +20.6% for SPY). Note the risk asymmetry: RDI runs 3.0 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.
RDI vs SPY: side by side
| RDI (Reading International Inc - Class A Non-voting) | SPY (SPDR S&P 500 ETF Trust) | |
|---|---|---|
| 1-year return | +36.4% | +20.6% |
| 5-year return | -57.8% | +82.4% |
| Volatility (ann.) | 44.2% | 14.5% |
| Beta vs S&P 500 | 0.26 | 1.00 |
| Max drawdown (3Y) | -58.5% | -18.8% |
| Market cap | – | – |
| P/E (trailing) | – | – |
| Dividend yield | 0.00% | 1.01% |
| Expense ratio | – | 0.09% |
| Assets under management | – | $795.3B |
| Sector / category | US Listed | ETF · US Large Cap |
SPY is a Large Blend fund from State Street Investment Management: $795.3B under management, 504 holdings, a 0.09% expense ratio, a 1.01% trailing dividend yield.
Year-by-year returns
| Year | RDI | SPY |
|---|---|---|
| 2022 | -31.4% | -18.2% |
| 2023 | -31.0% | +26.2% |
| 2024 | -30.9% | +24.9% |
| 2025 | -20.5% | +17.7% |
| 2026 | +100.0% | +13.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are RDI and SPY good diversifiers for each other?
Yes: at 0.08, the two have gone their own ways historically, which is what genuine diversification looks like.
FAQ
What is the correlation between RDI and SPY?
Using weekly returns as of 2026-08-27: 0.08 over 3 years, with 0.08 over the last year and 0.22 over 5 years.
Is SPY a good diversifier for RDI?
Yes: at 0.08, the two have gone their own ways historically, which is what genuine diversification looks like.
What does a correlation of 0.08 mean?
A reading of 0.08 sits on a scale from −1 (opposite moves) through 0 (unrelated) to +1 (identical moves). Correlation captures direction, not magnitude or performance.
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Related comparisons
Hubs: RDI correlations · SPY correlations
