When will a pullback come after the US stock market rebounds nearly 30% from its low point? With the S&P 500 index rebounding 27% from its low point on October 27th last year and its market value skyrocketing by $9 trillion, even the most optimistic investors may need to start preparing for a "healthy" pullback. Dubrovko Lakos Bujas, Chief Global Equity Strategist at JPMorgan Chase, issued a warning to clients this week that the five month long rally in the US stock market may soon come to an end. He also suggests that investors consider diversifying their positions and paying attention to risk management in their investment portfolios.