The stock market’s rise this year has narrowed around a short list of big tech companies, a sign of possible weakness heading into 2022.

Five of the biggest stocks in the S&P 500 account for more than half of the broad benchmark’s gain since April, analysts at Goldman Sachs found. Of the S&P 500’s 22% advance this year, those stocks— Microsoft Corp . , Nvidia Corp . , Apple Inc., Alphabet Inc . and Tesla Inc . —are responsible for around a third. 

Source: https://www.wsj.com/articles/five-big-tech-stocks-are-driving-markets-that-worries-some-investors-11640060038