Live: Dow loses 100 points, S&P 500 snaps 3-day advance as Alphabet and Caterpillar tank [https://www.cnbc.com/2026/10/28/stock-market-today-live-updates.html?__source=iosappshare%7Ccom.apple.UIKit.activity.CopyToPasteboard](https://www.cnbc.com/2026/10/28/stock-market-today-live-updates.html?__source=iosappshare%7Ccom.apple.UIKit.activity.CopyToPasteboard)