S&P 500 Up 14%, But 4 in 10 Stocks Are Down

Four in 10 S&P 500 stocks were down for 2026 as of Oct. 12, more than 200 names, while the index itself was up 14% as of Oct. 13, Reuters reported. In my view, that's concentration risk: because bigger companies count more, the index can rise even when the typical stock lags.