UBS Highlights 30‑Year Low in Bond‑Equity Correlation
UBS notes that the two‑month rolling correlation between the benchmark S&P 500 index and the yield on the U.S. 10‑Year Treasury has fallen to ‑0.69, the lowest level recorded since 1996. The research attributes this decline primarily to persistent U.S. inflation that has remained above roughly 3.1 %, a threshold at which historical bond‑equity correlations have tended to turn negative.
When inflation stays elevated, investors focus on how the Federal Reserve may keep policy rates higher for longer or even raise them further. Higher expected rates push Treasury yields up, which depresses bond prices, while the accompanying rise in borrowing costs can weigh on corporate earnings expectations and diminish the appeal of highly valued equities. Consequently, both bonds and equities can experience simultaneous pressure from the same inflation‑driven shock.
The shift challenges the conventional 60/40 portfolio model, which relies on bonds offsetting equity losses during market stress. UBS warns that in an environment where both asset classes react to the same inflation and rate‑risk factors, the diversification benefit erodes, increasing the likelihood of investors selling both stocks and bonds at the same time and creating a self‑reinforcing cycle of volatility. The bank also observes that deeply negative bond‑equity correlations have historically coincided with heightened volatility in government bond markets, especially during periods of Federal Reserve tightening. While UBS does not view additional rate hikes as its base case, it notes that market participants have recently raised the probability they assign to further tightening.
UBS suggests that markets may be transitioning to a new regime distinct from the past three years. Until inflation eases more convincingly or concerns over further Fed tightening subside, movements in Treasury yields are likely to remain a primary driver of broader market performance. Investors are therefore advised to monitor inflation data, Federal Reserve signals, and Treasury yield dynamics closely, in addition to corporate earnings, to gauge where equities may head next.
Reporting by Roushni Nair