Wall Street strategists are generally optimistic about the outlook through the rest of the year.
It said the gains will move beyond the popular Big Tech leaders.
The call comes after the broad equities benchmark posted its best week in the last 12 months.
But market enthusiasm will likely fade at the start of 2025, the Morgan Stanley strategist said.
Ex-JPMorgan employee Marko Kolanovic was picked as the best performer in equity-linked strategies.
The strategists at JPMorgan's asset and wealth-management arms expect U.S. stocks to trounce cash.
The optimism comes even as traders face bubbling market risks.
The economist placed the chances of a bull market at 80%.
The strategist known for his bearish calls in recent years says a major collapse is unlikely.
The company said chipmaker losses caused a downdraft that will be short-lived.