โ๐ง Current Dominance: Artificial intelligence stocks (based on the JPM basket) now account for a massive 49% of the S&P 500.
๐ฐ Driving Growth: Just 41 companies in this space are responsible for roughly two-thirds of the indexโs total market cap gains this year.
๐ The SpaceX Factor: If SpaceX ($SPCXB ) were listed and included, the AI sector's weight would officially cross the majority threshold at 51%.
๐ฎ Future IPOs: Should heavyweights like OpenAI and Anthropic (The biggest investors and partners are Amazon $AMZNB and Google$GOOGLB , which have invested billions of dollars into the startup and provide their cloud servers to train new versions of Claude) go public and join the index, AI's share is projected to hit around 55%.
๐ Historic Parallel: The last time a single industry held more than half of the S&P 500's weight was during the 19th-century railroad boom!
