
The S&P 500 has reached an unprecedented level of concentration, with the top 10 stocks driving 54% of its market cap gains since January 2021, according to the Kobeissi Letter.
What Happened: This means that out of a 70% total gain, would have come from just the top 10 companies, including giants like Apple Inc. (NASDAQ:AAPL), Microsoft Corp. (NASDAQ:MSFT), and Nvidia Corp. (NASDAQ:NVDA).