This document is about an annual report to the U.S. Congress on self-insured group health plans. It presents aggregate statistics on self-insured and mixed-insured group health plans that filed Form 5500 in 2010, including information on plan type, number of participants, funding arrangements, assets, contributions, and benefit payments. The report also provides an analysis of the financial information available for employers that sponsor self-insured or mixed-insured health plans based on a matching of Form 5500 data to publicly available financial data. The report highlights the limitations of the available data and the complexities involved in interpreting the information on self-insured group health plans.