Live: Stock market rocked as investors dump tech shares; Nasdaq suffers worst day since June [https://www.cnbc.com/2026/10/29/stock-market-today-live-updates.html?__source=iosappshare%7Ccom.apple.UIKit.activity.CopyToPasteboard](https://www.cnbc.com/2026/10/29/stock-market-today-live-updates.html?__source=iosappshare%7Ccom.apple.UIKit.activity.CopyToPasteboard)