This document is about an abstract of the 2015 Form 5500 Annual Reports for private pension plans in the United States. It provides highlights, statistics, and detailed analysis on the number of plans, participants, assets, contributions, and benefits for defined benefit and defined contribution pension plans in 2015. The report discusses the ongoing shift from DB to DC plans, changes in plan funding and participant characteristics, and the overall financial status of the private pension system, which saw a decline in total assets for the first time since 2008.