Investment Strategy
The Portfolio invests in three Vanguard bond index funds and one Vanguard short-term reserves account, resulting in an allocation of 35% of its assets to investment-grade U.S. bonds, 15% of its assets to investment-grade non-U.S. bonds, and 50% of its assets in short-term investments. The percentages of the Portfolio's assets allocated to each Underlying Fund are:
Vanguard Total Bond Market II Index Fund 23%
Vanguard Total International Bond Index Fund 15%
Vanguard Short-Term Inflation-Protected Securities Index Fund 12%
Vanguard Short-Term Reserves Account 50%
Through its investment in Vanguard Total Bond Market II Index Fund, the Portfolio indirectly invests in a broadly diversified collection of securities that, in the aggregate, approximates the Bloomberg Barclays U.S. Aggregate Float Adjusted Index in terms of key risk factors and other characteristics. The Index represents 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 1 year. The fund maintains a dollar-weighted average maturity consistent with that of the Index, which generally ranges between 5 and 10 years.
Through its investment in Vanguard Total International Bond Index Fund, the Portfolio indirectly invests in government, government agency, corporate, and securitized non-U.S. investment-grade fixed income investments, all issued in currencies other than the U.S. dollar and with maturities of more than one year. To minimize the currency risk associated with investments in bonds denominated in currencies other than the U.S. dollar, the Fund will attempt to hedge its currency exposures.
Through its investment in Vanguard Short-Term Inflation-Protected Securities Index Fund, the Portfolio indirectly invests in inflation-protected public obligations issued by the U.S. Treasury with remaining maturities of less than 5 years. The Fund maintains a dollar-weighted average maturity consistent with that of the target index, which generally does not exceed 3 years.
Through its investment in Vanguard Short-Term Reserves Account, the Portfolio indirectly invests in funding agreements issued by one or more insurance companies, synthetic investment contracts, as well as shares of Vanguard Federal Money Market Fund. Funding agreements are interest-bearing contracts that are structured to preserve principal and accumulate interest earnings over the life of the investment. The investments pay interest at a fixed minimum rate and have fixed maturity dates that normally range from 2 to 5 years. Vanguard Federal Money Market Fund invests in high-quality, short-term money market instruments issued by the U.S. government and its agencies and instrumentalities. For more information about Vanguard Short-Term Reserves Account, please see the Interest Accumulation Portfolio.
Investment Risks
Because it invests mainly in bond fund holdings, the Portfolio primarily is subject to low to moderate levels of interest rate risk, income risk, call risk, prepayment risk, extension risk and income fluctuation risk. The Portfolio also has low to moderate levels of credit risk, index sampling risk, currency hedging risk, nondiversification risk, liquidity risk, and derivatives risk.