What is supi in reinsurance?

In reinsurance, "supi" refers to a "superior underwriting profit index," which is a metric used to evaluate the performance of a reinsurer's underwriting activities. It assesses the profitability of underwriting operations by comparing the premiums earned against the losses incurred and expenses associated with those policies. A higher supi indicates better underwriting performance and efficiency, making it a key indicator for reinsurers and their stakeholders.