The 10 largest US stocks now make up a record 41% of the S&P 500's $61.1T market cap, with Nvidia, Alphabet, and Apple leading a historic concentration in mega-cap tech.

The 10 largest US stocks now make up a record 41% of the S&P 500's market cap, driven by AI and mega-cap tech, with parallels to crypto market concentration.

The 10 largest US stocks now make up a record 41% of the S&P 500's $61.1T market cap, with Nvidia, Alphabet, and Apple leading a historic concentration in mega-cap tech.