Live: Nasdaq slides 2% Friday to post worst week since June, pressured by AI sell-off and oil prices [https://www.cnbc.com/2026/10/15/stock-market-today-live-updates.html?__source=iosappshare%7Ccom.apple.UIKit.activity.CopyToPasteboard](https://www.cnbc.com/2026/10/15/stock-market-today-live-updates.html?__source=iosappshare%7Ccom.apple.UIKit.activity.CopyToPasteboard)