As profit growth slows, the tech giants that contributed more than half of the S&P 500's 23% gain last year may struggle to dominate the market in 2025. The slowdown in profits 'may surprise some die-hard investors betting on these very high double-digit growths,' said Morgan Stanley Wealth Management Chief Investment Officer Lisa Shalett on Thursday. 'The idea that they can be traded together as a group and lead the market may waver in 2025.'