This document is about an analysis of the funding mechanisms of employer-sponsored health benefit plans in the United States, based on Form 5500 filings. It examines trends in the prevalence of self-insured, fully insured, and mixed-funded plans over a 10-year period, and looks at how funding mechanisms vary by plan size, industry, and the for-profit/not-for-profit status of the plan sponsor. The report also explores the use of stop-loss insurance and the financial health of plan sponsors.