The Colorado Division of Insurance has engaged Milliman to evaluate certain aspects of a claims-based reinsurance program for the individual health insurance market for the potential submission of a Section 1332 State Innovation Waiver. This final report details our evaluation of these aspects of the program based on proprietary insurer enrollment and claims data, member-level enrollment information Connect for Health Colorado (Exchange), and publicly available information. This report should be read in its entirety which identifies key actuarial considerations related to the funding and design of state-based reinsurance programs.