These twelve large-cap stocks were the worst performers in the last week. Are they in your portfolio? Edwards Lifesciences Corporation (NYSE:EW) shares plummeted 28.05%  after the company reported worse-than-expected Q2 sales results and issued Q3 guidance below estimates. The company also acquired JenaValve and Endotronix. Several analysts slashed their price forecast. Ford Motor Company (NYSE:F) shares dived 19.12% following a Q2 EPS miss. Several analysts lowered their price target. STMicroelectronics (NYSE:STM) shares declined 17.60% after the company reported a Q2 EPS miss ...