This document is about the Private Pension Plan Bulletin for 2005, which provides an abstract of the Form 5500 Annual Reports for private pension plans in the United States. It covers key highlights, trends, and statistics related to the number of pension plans, total and active participants, assets, contributions, and benefits for various types of pension plans, including defined benefit and defined contribution plans, as well as 401(k) plans, in the United States in 2005.