Ten stocks reportedly drove around 70% of S&P 500 gains since March 30

A user says 10 stocks drove around 70% of S&P 500 gains since March 30 and warns that a correction in the big names could hurt the wider US market. Separately, a market update says the S&P 500 ended a four-day winning streak and the Nasdaq a five-day rally, pointing to earnings, AI investment returns and valuations as key signals.