Credit Spreads as Predictors of Equity Market Returns

Credit risk is the risk of financial loss arising from a borrower’s failure to meet its debt obligations. However, credit risk not only affects credit markets but can also affect equity markets, for example, through options volatility and returns. We have previously discussed how credit risk affects the returns of momentum strategies.

Along the same line, Reference [1] examines whether movements in corporate credit spreads reliably predict future U.S. equity-market performance. The hypothesis is that widening IG/HY spreads precede lower S&P 500 returns, narrowing spreads precede higher returns, and predictive strength varies across market regimes.

The author uses monthly data from January 2000 to July 2025, comprising approximately 305 observations. The dataset includes ICE BofA investment-grade (IG) and high-yield (HY) option-adjusted spreads (OAS), 10-year Treasury and 3-month T-bill yields, and the S&P 500 Total Return Index. The analysis employs OLS regressions with Newey-West HAC standard errors, with additional specifications controlling for the Treasury term spread and lagged equity returns.

The paper pointed out,

The results indicate that corporate credit spreads, especially changes in Investment-Grade (IG) spreads, carry meaningful predictive information about equity market performance. The consistently negative regression coefficients show that widening spreads are typically followed by weaker S&P 500 returns, supporting the hypothesis that tightening credit conditions signal rising risk aversion and slower economic growth. This relationship was strongest during 2008-2015, when financial stress was elevated, suggesting that the predictive power of spreads depends on market conditions and becomes more useful in periods of heightened uncertainty. The later 2016–2025 period shows a different pattern, with some predictors displaying positive coefficients. This reflects the unusual macroeconomic environment following the COVID-19 shock, where aggressive monetary intervention and rapid market recoveries caused spreads to widen during rebounds rather than deteriorations. This suggests that the credit-equity link is not constant, but shifts depending on the dominant macro regime.

These findings reinforce the idea that credit markets often reprice risk before equities. Credit spreads reflect how investors view the overall level of risk in the market, including the chances of default, the availability of liquidity, and expectations about the broader economy. When they widen, it reflects a deterioration in market confidence that later translates into weaker corporate earnings and stock performance. This result supports earlier studies suggesting that movements in credit spreads can signal where the economy and financial markets are headed, reflecting shifts in overall risk.

In short, the results indicate that corporate credit spreads, particularly changes in investment-grade spreads, contain predictive information about equity returns. Widening spreads generally precede weaker S&P 500 returns, although the relationship varies across market regimes and was strongest during 2008–2015. The findings suggest that credit markets can reprice risk before equities, making credit spreads potentially useful indicators of subsequent equity-market performance.

These findings provide further evidence that developments in credit markets can affect equity markets. The results can be used directly as trading signals, or the variables can be incorporated into a regime-detection algorithm.

Let us know what you think in the comments below or in the discussion forum.

References

[1] Vishwa Kalal, Corporate Credit Spreads as Predictors of Equity Market Performance, AlgoGators Capstone Project, 2025.

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