David Einhorn’s main hedge fund at Greenlight Capital fell 5.2 percent in November and is poised for only its second losing year in almost two decades. The losses bring the fund’s yearly drop to almost 21 percent, according to an e-mail sent to clients that was obtained by Bloomberg. Jonathan Gasthalter, a spokesman for Greenlight with Sard Verbinnen & Co., declined to comment on the results. Einhorn’s hedge fund this year has...