Castle Securities has identified the next significant risk for investors as a tightening of financial conditions, suggesting the Federal Reserve may need to raise interest rates "soon" to combat mounting inflationary pressures.

Castle Securities head of fixed income sales for Europe, the Middle East, and Africa, Nohshad Shah, noted in a client report that a substantial artificial intelligence investment cycle, tightening energy markets, and a robust labor market are collectively elevating upside risks to economic growth and inflation.

Shah stated that the Fed's next policy move is likely to be an interest rate increase, and it could occur "perhaps soon."

A stronger-than-expected U.S. jobs report last Friday triggered a sharp decline in global stock and bond markets, as investors grew concerned that excessive economic resilience would prevent policymakers from maintaining current interest rates. The data fueled market bets on a 25-basis-point Fed rate hike by year-end, with the probability of a hike as early as September now reaching 50%.

Shah indicated that the labor market may be approaching a "turning point." He explained that with unemployment low and labor supply constrained, any further acceleration in growth could push wage increases well above levels consistent with the Fed's inflation target.

He also pointed out that inflationary pressures could persist even if the Strait of Hormuz reopens and energy market disruptions ease.