Vanguard Total Bond Market II Index Fund Institutional Shares 

This fund aims to mirror the performance of the Bloomberg U.S. Aggregate Float Adjusted Index through an indexing strategy. It achieves this by employing a sampling technique, meaning it invests in a broadly diversified selection of securities. This curated collection is designed to collectively approximate the overall index's key risk attributes and other defining features. A minimum of 80% of the fund's assets are committed to bonds that are components of the underlying index.