Billionaire David Einhorn's hedge fund, Greenlight Capital, disclosed fresh positions in Syngenta (SYT) , Monsanto (MON) , Alcoa (AA) - Get Report and Fred's Inc. (FRED) . The stakes were disclosed in its quarterly 13F filing from the Securities and Exchange Commission. Monsanto is the midst of being sold to Bayer, which is based in Germany. Apple actually remains Einhorn's top holding, with some $800 million invested in the technology giant. TheStreet's Scott Gamm reports from Wall Street.