For Equities I am not sure IB supports multiple prime brokers or has as good borrow and lend capabilities as the big brokers do. Also it doesn't have access to

For Equities I am not sure IB supports multiple prime brokers or has as good borrow and lend capabilities as the big brokers do. Also it doesn't have access to institutional algos offered by the big brokers. The big Prime desks support BB as well as Fidessa and other systems.