Oct 21, 2026
Oct 21, 2026
Oct 21, 2026
Oct 21, 2026
Oct 21, 2026
Oct 21, 2026
Oct 21, 2026
Oct 21, 2026
about 16 hours ago
The top 15 names in the S&P 500 now account for a record 46.7% of index value, up from 27.2% at the dot-com peak. The concentration risk is mechanical, not valuation-driven, and it changes what a passive investor actually owns.