Twitter, AmEx, Yelp among stocks to watch By: MarketWatch July 29, 2014 at 19:07 PM EDT Twitter, American Express and Express Scripts are among the stocks to watch in the overnight session and before Wednesday’s opening bell. Read More >> Related Stocks: Allstate Corp American Express Express Scripts Holding Goodyear Tire & Rub Humana Kraft Foods Group MetLife Phillips 66 Sentinelone Inc Cl A Sodastream Int Ltd Twitter, Inc. Valero Energy Whole Foods Market Yelp Inc