US Equity Risk Premium Hits Lowest Since 2002; JPMorgan Warns Rate Shock Will Hurt More Than Past Two Decades

The buffer for US stocks is running thin. JPMorgan warns that the S&P 500 equity risk premium has fallen to 2.1%, the lowest since 2002 and more than 100 basis points below its historical average. The low-premium era harbors three hidden dangers: stocks' sensitivity to interest rate shocks will systematically rise, global investors' overweight in equities at a two-decade high faces rebalancing pressure, and the strengthening positive stock-bond correlation continues to undermine risk parity strategies. If real rates climb further, this quiet valuation repricing could turn violent.

The excess return of stocks over bonds has shrunk to historic lows, leaving US equities with almost no buffer against interest rate shocks.

According to JPMorgan's latest research report, the S&P 500 equity risk premium (ERP) has dropped to about 2.1%, not only more than 100 basis points below its historical average but also the lowest level since 2002. This trend is particularly striking against the backdrop of a recent sustained rise in real bond yields. JPMorgan's global market strategy team warns that in a low-risk-premium era, the stock market's sensitivity to interest rate changes will rise significantly, and the impact could exceed what investors have generally expected over the past two decades.

Analysts point to three chain effects: first, the stock market's sensitivity to bond yields will systematically increase; second, long-term investors will have stronger incentives to rebalance assets from stocks to bonds; third, the positive stock-bond correlation that has formed since the 2022 inflation shock will be further reinforced. For risk parity strategies that rely on bond duration to hedge equity risk, these changes constitute a persistent headwind.

Risk Premium Falls to 2.1%, Lowest Since 2002

JPMorgan uses a dividend discount model (DDM) framework, plugging the current S&P 500 price into a discounted cash flow equation to back out the equity discount rate, then subtracting the 10-year US Treasury real yield to derive the equity risk premium estimate.

Strategist Nikolaos Panigirtzoglou and his team calculate that the S&P 500 equity risk premium is currently about 2.1%, roughly 100 basis points below its historical average. The indicator has broken below the cyclical low of 2.4% in the third quarter of 2007; since then, continued stock market gains combined with further increases in real bond yields have pushed the risk premium down another notch.

Historical data show that from 1974 to 1998, the equity risk premium was similarly low, a period that encompassed high inflation and the subsequent disinflation phase. JPMorgan notes that back then, stock yields were significantly more sensitive to bond yields, sometimes moving almost in lockstep. With the current risk premium back in a comparable range, a similar linkage mechanism could reemerge.

Stock-Bond Rebalancing Pressure Mounts; Investors Most Overweight Equities Since 2002

The second implication of the narrowing risk premium points to asset allocation. JPMorgan's estimates of implied allocations for global non-bank investors show that the current overweight in equities relative to bonds is the highest since 2002; separate calculations for G4 pension funds and insurance companies (covering the US, UK, euro area, and Japan) reach the same conclusion.

The report notes that the current low-risk-premium regime could theoretically persist—if AI-related productivity gains continue to drive earnings growth, then lower premium levels have fundamental support. However, if real rates rise further from current levels, the compression in expected return differentials between stocks and bonds will give multi-asset investors an incentive to add bonds, and the scale of rebalancing flows from stocks to bonds could exceed recent years' levels.

Positive Stock-Bond Correlation Strengthens, Risk Parity Strategies Under Pressure

JPMorgan attributes the third implication of the narrowing risk premium to stock-bond correlation.

After the 2022 inflation shock, the daily return correlation between global stocks and bonds has turned from negative to positive. The bank believes the current low-risk-premium environment will further cement this positive correlation through two channels: first, the valuation channel—stocks become more sensitive to bond yields; second, the macro mechanism channel—if inflation volatility remains relatively high, the probability of stocks and bonds moving in the same direction will stay elevated.

These changes pose a systemic challenge to risk parity trades. The strategy relies on bond duration as a hedge against equity risk, and the positive stock-bond correlation weakens that hedge. JPMorgan expects demand from multi-asset investors for direct hedging tools such as equity options to rise accordingly.

Rising Real Rates: Growth Optimism or Term Premium?

The recent rise in real bond yields has also sparked debate over its drivers. JPMorgan believes this upturn cannot be easily attributed to a single factor.

The bank cites the Federal Reserve's D'Amico, Kim and Wei (DKW) model to decompose the 10-year real Treasury yield. The data show that the sharp repricing of real rates in 2022 was driven mainly by expected real short-term rates, consistent with aggressive monetary tightening. Since late February this year, however, the rise in real yields has been roughly evenly split between expected real short-term rates and the term premium.

JPMorgan notes that this decomposition is consistent with a modest upward revision in market expectations for long-term potential growth, possibly reflecting new growth optimism from the AI investment cycle; at the same time, persistently high fiscal deficits and ongoing quantitative tightening (QT) by other developed-market central banks are also contributing factors that cannot be ignored. Based on Consensus Economics data, long-term real growth expectations have begun to improve since late 2023, but compared with the downtrend from the 2008 financial crisis to the COVID-19 pandemic, the current rise in real rates is still significantly larger than the improvement in growth expectations.