Jefferies has lured away four of Guggenheim Partners' senior-most technology bankers on the West Coast, an unusually large hiring spree as the boutique investment bank builds up its tech practice, according to people familiar with the matter. Guggenheim's senior managing director Robert Bartlett and managing directors Jalil Musayev, Nash Abu-Zahra, and Gaurav Thakur will join Jefferies in a few months, one of the people said, asking not to be named because the hires have not been publicly announced. Jefferies is poaching veterans from Guggenheim’s core team investment banking team focused on tech deals on the West Coast, the person said.