Described are computer-based methods and apparatuses, including computer program products, for managing insurance plans. Multiple bids are received from multiple reinsurance companies for the price of a unit of an insurance product (e.g., a fixed annuity paying ten dollars a month starting at the age of sixty five). The unit of the insurance product is associated with a set of one or more risk factors (e.g., age, range of ages). A bid is selected from the bids based on a relationship between the bids (e.g., lowest bid, lowest weighted bid). The selected bid is associated with a selected reinsurance company. Units of the insurance product associated with the selected bid are offered to participants associated with the set of one or more risk factors.