Lehman Brothers appears to be suffering a bit of an exodus from its options team. Scott McGreery is believed to have left the bank in Singapore. He joined in March 2007 from Citi. Meanwhile, Jelena Bosanac and Jacob Bartram are believed to have left the bank in London this week. The empty seats in the options area will come as a shock to Will Vogel, who is scheduled to join Lehman from Deutsche to trade options next week.