6 U.S. companies that are fattening profits By: MarketWatch March 23, 2016 at 04:32 AM EDT Profit margins at most firms have reached a plateau, which is limiting stock gains, says Michael Brush. Read More >> Related Stocks: Apple Goldman Sachs Group Martin Marietta Materials Netflix Oracle Corp Paypal Holdings Salesforce Standard & Poors 500 The Priceline Group Vulcan Materials eBay