New York City Deferred Compensation Plan, with $4 billion in assets, will issue an RFP for synthetic GIC managers to manage a total of $750 million, said Dean Weltman, plan compliance officer. Current managers BlackRock, CreditSuisse, PIMCO and Wellington are allowed to rebid. Mr. Weltman said the plan wants to have more than four managers to increase diversification. The RFP will be available Feb. 28 on the plans website at www.nyc.gov/deferredcomp. Proposals are due April 11; no selection timetable was available.