Four in 10 S&P 500 Stocks Are Down Despite 14% Index Gain

More than 200 S&P 500 members were down in 2026 as of Oct. 12, or four in 10 stocks, Reuters reported. The S&P 500 itself was up 14% in 2026 as of Oct. 13, Reuters reported. I read that gap as concentration risk: a capitalization-weighted index can climb while the typical holding lags.