Vanguard Mid-Cap Index

Objective And Strategy

Objective
Track the performance of a benchmark index that measures the investment return of mid-capitalization stocks.

Strategy
The Portfolio employs a "passive management" - or indexing - investment approach designed to track the performance of the MSCI® US Mid Cap 450 Index, a broadly diversified index of stocks of medium size U.S. companies. The Portfolio attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index.
Low Cost Fund

Principal Risks

* This portfolio invests (or may invest) in securities of companies with micro-, small-, or mid-capitalization. Any investment in micro-, small-, or mid-capitalization companies involves greater risk than that customarily associated with investments in larger, more established companies because of the greater business risks of smaller size, limited markets and financial resources, narrower product lines, and frequent lack of management depth. As such, micro- or small-cap companies may be more subject to erratic and abrupt market movements than securities of larger, more established companies.

* This Fund does not use defensive strategies or attempt to reduce its exposure to poorly performing stocks. Therefore, if the index performs poorly, the Fund, because it is correlated to the index, will perform poorly. Correlation between the Fund's performance and that of the index may also be negatively affected by the Fund's expenses, changes in the composition of the index, and the timing of purchase and redemption of Fund shares.