5 trillion-dollar companies behind most of the S&P 500's gains this year (4 min read)
The S&P 500 index has experienced significant gains this year, increasing by almost 10%. However, these gains were largely attributed to the exceptional performance of just five companies: Apple, Microsoft, Alphabet, Amazon, and Nvidia. These companies have collectively raised their market cap by approximately $2.9 trillion in 2023, accounting for 96% of the overall gains in the S&P 500's market value. This means the rest of the 495 companies only contributed to just 4% of the gains, which raised concerns about concentration risk in the index.