Notes to Financial Statements
Vanguard Mid-Cap Growth Index Fund is registered under the Investment Company Act of 1940 as an open-end
investment company, or mutual fund. The fund offers two classes of shares: Investor Shares and ETF Shares.
Investor Shares are available to any investor who meets the fund’s minimum purchase requirements. ETF Shares
are listed for trading on the American Stock Exchange; they can be purchased and sold through a broker.
A. The following significant accounting policies conform to generally accepted accounting principles for U.S.
mutual funds. The fund consistently follows such policies in preparing its financial statements.
1. Security Valuation: Securities are valued as of the close of trading on the New York Stock Exchange (generally
4 p.m., Eastern time) on the valuation date. Equity securities are valued at the latest quoted sales prices or official
closing prices taken from the primary market in which each security trades; such securities not traded on the
valuation date are valued at the mean of the latest quoted bid and asked prices. Securities for which market
quotations are not readily available, or whose values have been materially affected by events occurring before
the fund’s pricing time but after the close of the securities’ primary markets, are valued by methods deemed by
the board of trustees to represent fair value. Investments in Vanguard Market Liquidity Fund are valued at that
fund’s net asset value.
2. Futures Contracts: The fund uses index futures contracts to a limited extent, with the objectives of maintaining
full exposure to the stock market, enhancing returns, maintaining liquidity, and minimizing transaction costs. The
fund may purchase futures contracts to immediately invest incoming cash in the market, or sell futures in
response to cash outflows, thereby simulating a fully invested position in the underlying index while maintaining
a cash balance for liquidity. The fund may seek to enhance returns by using futures con