The S&P 500 index has increased its total market capitalization by more than $5 trillion thus far in 2026. This expansion is primarily attributed to artificial intelligence stocks, which have generated $6 trillion in value, and the energy sector, which contributed $200 billion in gains.
The $6.2 trillion in combined growth from these two industries offset a $1 trillion loss across all other market segments during the same period. These figures demonstrate that the total index appreciation is currently dependent on AI and energy performance, as the broader market has experienced a net decline in valuation.