JPMorgan Chase & Co. analysts have identified an in-house indicator that is now "flashing a buy-signal." This particular signal has historically preceded rallies in the S&P 500 Index.

According to the bank's strategists, including Marko Kolanovic, the equity market has seen a significant shift in investor sentiment. They noted that "risk sentiment has improved substantially" following the Federal Reserve's decision to pause rate hikes. This shift has been accompanied by a decrease in market volatility, with the Cboe Volatility Index, or VIX, falling to its lowest level since before the pandemic.

The JPMorgan indicator, which has been historically accurate, suggests that the broad market index is likely to move higher. This optimism is further supported by a reduction in downside hedges by systematic investors, which they believe will likely accelerate the upward momentum in equities. The bank's analysis points to a potential rally driven by improved sentiment and reduced hedging activity, signaling a favorable environment for the S&P 500.