Tech stocks now exceed 50% of S&P 500 index weight, with IT alone at 39.4%, surpassing the dot-com era record. What concentration risk means for investors.

The IT sector now makes up a record 39.4% of the S&P 500's market cap, surpassing the dot-com peak, as AI spending drives unprecedented market

Tech sector's share of S&P 500 at all-time high of 39%, surpassing previous highs in dot-com era and energy sector, with AI leadership driving gains.

Tech stocks now exceed 50% of S&P 500 index weight, with IT alone at 39.4%, surpassing the dot-com era record. What concentration risk means for investors.