US STOCKS-S&P stumbles as Moderna sinks on report questioning trial results By: Reuters: Company News May 19, 2020 at 16:21 PM EDT * Dow down 1.59%, S&P 500 down 1.05%, Nasdaq down 0.54% (Adds volume, market breadth data) Read More >> Related Stocks: Advance Auto Parts Inc Home Depot Kohl's Corp Moderna Inc Wal-Mart Stores, Inc.