ISD vs SPY: Correlation
Measured on weekly returns over the past three years, PGIM High Yield Bond Fund, Inc. (ISD) and SPDR S&P 500 ETF Trust (SPY) carry a correlation of 0.57, a moderate link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are ISD and SPY?
Across a 3-year window, the weekly returns of ISD and SPY correlate at 0.57, moderate. Little has changed lately, as the 1-year reading of 0.63 lands near the 3-year figure. Stretching to 5 years gives 0.63, with an annualized covariance of 103.9 %².
By 3-year correlation, SPY places #10 of the 19 assets tracked against ISD. Their recent paths diverged sharply: over the last 12 months SPY outperformed by 27.6 percentage points (-7.0% for ISD against +20.6% for SPY).
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.
ISD vs SPY: side by side
| ISD (PGIM High Yield Bond Fund, Inc.) | SPY (SPDR S&P 500 ETF Trust) | |
|---|---|---|
| 1-year return | -7.0% | +20.6% |
| 5-year return | +21.1% | +82.4% |
| Volatility (ann.) | 12.7% | 14.5% |
| Beta vs S&P 500 | 0.50 | 1.00 |
| Max drawdown (3Y) | -13.9% | -18.8% |
| Market cap | $0.4B | – |
| P/E (trailing) | 10.5 | – |
| 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 | ISD | SPY |
|---|---|---|
| 2022 | -18.4% | -18.2% |
| 2023 | +15.1% | +26.2% |
| 2024 | +22.1% | +24.9% |
| 2025 | +15.6% | +17.7% |
| 2026 | -9.9% | +13.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are ISD and SPY good diversifiers for each other?
To a limited degree. At 0.57 the two still catch most of the same waves, so the pair smooths returns a little without insulating either from a shared selloff.
FAQ
What is the correlation between ISD and SPY?
As of 2026-08-27, the correlation of weekly returns between ISD and SPY is 0.57 over 3 years, 0.63 over 1 year and 0.63 over 5 years.
Is SPY a good diversifier for ISD?
To a limited degree. At 0.57 the two still catch most of the same waves, so the pair smooths returns a little without insulating either from a shared selloff.
What does a correlation of 0.57 mean?
A reading of 0.57 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: ISD correlations · SPY correlations
