These large-cap stocks were the best performers in the last week. Are they in your portfolio? First Solar, Inc. (NASDAQ:FSLR) shares jumped 41.5% possibly in response to President Joe Biden's recent announcement of increased tariffs on Chinese imports, which included a significant hike on solar cells. Also, several analysts raised the price target. Moderna, Inc. (NASDAQ:MRNA) shares surged 23.4% on reports indicating disease experts predict a small rise in COVID-19 cases this summer. E.L.F. Beauty, Inc. (NYSE:ELF) shares escalated 21.9% ...