David Einhorn's Greenlight Capital was one of the first funds to report good news to investors, telling clients that he gained 1.9 percent in February which left the fund up 3.3 percent for the first two months of 2016, a source said. Rosenstein told investors that his Jana Partners fund lost 3.6 percent in February, leaving it down 7.3 percent. His Jana Nirvana fund lost even more money, dropping 5.37 percent to be off 10.9 percent, a second source said. For Rosenstein, part of the trouble is surely related to pharmaceutical company Valeant Pharmaceuticals International Inc...