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S&P 500 ended Q1 2025 with a market cap of $49.41 trln, a net decrease of $2.45 trln from $51.86 trln at the end of Q4 2024.

Small-cap stocks in the U.S. were falling Friday afternoon, posting losses that scaled back their weekly advance. The Russell 2000 index, a measure of U.S. small-cap equities, was down 0.4% in ...

and six currently have a market cap of more than $1 trillion. As they've grown, their combined value has made up a larger -- and some would say concerning -- portion of the S&P 500. Read on for a ...