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The Bond Index Portfolio seeks to track the performance of a broad, market-weighted index. In so doing the Portfolio seeks to provide income.
The Bond Index Portfolio invests all of its assets in Vanguard® Total Bond Market Index Fund. The Fund employs an indexing investment approach designed to track the performance of the Bloomberg Barclays U.S. Aggregate Float Adjusted Index. This Index measures a wide spectrum of public, investment grade, taxable fixed income securities in the United States—including government, corporate, and international dollar-denominated bonds, as well as mortgage-backed and asset-backed securities—all with maturities of more than one year. The Fund invests by sampling the Index, meaning that it holds a broadly diversified collection of securities that, in the aggregate, approximates the full Index in terms of key risk factors and other characteristics. All of the Fund's investments will be selected through the sampling process, and at least 80% of the Fund’s assets will be invested in bonds in the index. The Fund maintains a dollar-weighted average maturity consistent with that of the Index, which generally ranges between five and ten years.
Because it invests entirely in a bond fund, the Portfolio primarily is subject to moderate levels of interest rate risk, income risk, call risk, prepayment risk, and extension risk, and low levels of credit risk, index sampling risk and derivatives risk.
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**The Spliced Total Bond Market Index consists of the Barclays U.S. Aggregate Bond Index through December 31, 2009; and the Bloomberg Barclays U.S. Aggregate Float Adjusted Index thereafter. Effective September 29, 2016, Barclays indexes were rebranded to Bloomberg Barclays indexes.
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