Bill Gross, the billionaire investor known as the 'Bond King', has indicated that the rally propelling U.S. stocks to nearly double their value over the past five years is losing momentum. He advises investors to prepare for lower, yet positive returns moving forward. In light of this anticipated slowdown in the bull market, Gross recommends a strategic shift towards defensive stocks. He has identified four specific investments that could help investors navigate the changing market conditions as the stock market's record-setting run is expected to decelerate.