This document is about a report on private sector employer-sponsored group health plans based on 2011 Form 5500 filings. It provides detailed statistics and analysis on the universe of group health insurance plans, including the number of plans, participants, assets, liabilities, contributions, and benefits. The report categorizes plans as self-insured, fully-insured, or mixed-insured based on their funding arrangements and provides insights into the characteristics and financial details of each plan type.