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Vanguard Total Stock Market Index Fund

Summary Prospectus

April 29. 2010

Investor Shares for Participants

Vanguard Total Stock Market Index Fund Investor Shares (VTSMX)

The Fund’s statutory Prospectus and Statement of Additional Information dated

April 29, 2010, and financial highlights information from the most recent

shareholder report are incorporated into and made part of this Summary

Prospectus by reference.

Before you invest, you may want to review the Fund’s Prospectus, which

contains more information about the Fund and its risks. You can find

the Fund’s Prospectus and other information about the Fund online at

www.vanguard.com/prospectus. You can also get this information at

no cost by calling 800-523-1188 or by sending an e-mail request to

online@vanguard.com.

The Securities and Exchange Commission has not approved or disapproved these securities or passed

upon the adequacy of this prospectus. Any representation to the contrary is a criminal offense.

Investment Objective

The Fund seeks to track the performance of a benchmark index that measures the investment return of the overall stock market.

Fees and Expenses

The following tables describe the fees and expenses you may pay if you buy and hold Investor Shares of the Fund.


Shareholder Fees
(Fees paid directly from your investment)
Sales Charge (Load) Imposed on Purchases	None
Purchase Fee	None¹
Sales Charge (Load) Imposed on Reinvested Dividends	None
Redemption Fee	None
1 The Fund reserves the right to deduct a purchase fee from future purchases of shares.

Annual Fund Operating Expenses

(Expenses that you pay each year as a percentage of the value of your investment)


Management Expenses	0.15%
12b-1 Distribution Fee	None
Other Expenses	0.03%
Total Annual Fund Operating Expenses	0.18%

Example

The following example is intended to help you compare the cost of investing in the Fund’s Investor Shares with the cost of investing in other mutual funds. It illustrates the hypothetical expenses that you would incur over various periods if you invest $10,000 in the Fund’s shares. This example assumes that the Shares provide a return of 5% a year and that operating expenses remain the same. The results apply whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be:


1 Year	3 Years	5 Years	10 Years
$18	$58	$101	$230

Portfolio Turnover

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 5% of the average value of its portfolio.

Primary Investment Strategies

The Fund employs a “passive management”—or indexing—investment approach designed to track the performance of the MSCI^®US Broad Market Index, which represents 99.5% or more of the total market capitalization of all the U.S. common stocks regularly traded on the New York Stock Exchange and the Nasdaq over-the-counter market. The Fund typically holds 1,200–1,300 of the stocks in its target index (covering nearly 95% of the Index’s total market capitalization) and a representative sample of the remaining stocks. The Fund holds a broadly diversified collection of securities that, in the aggregate, approximates the full Index in terms of key characteristics. These key characteristics include industry weightings and market capitalization, as well as certain financial measures, such as price/earnings ratio and dividend yield.

Primary Risks

An investment in the Fund could lose money over short or even long periods. You should expect the Fund’s share price and total return to fluctuate within a wide range, like the fluctuations of the overall stock market. The Fund’s performance could be hurt by:

• Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund’s target index may, at times, become focused in stocks of a particular sector, category, or group of companies.

• Index sampling risk, which is the chance that the securities selected for the Fund, in the aggregate, will not provide investment performance matching that of the Fund’s target index. Index sampling risk for the Fund should be low.

An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Annual Total Returns

The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund‘s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns compare with those of the Fund‘s target index and other comparative indexes. The Spliced Total Stock Market Index reflects performance of the Dow Jones U.S. Total Stock Market Index through April 22, 2005, and performance of the MSCI US Broad Market Index thereafter. The Dow Jones U.S. Total Stock Market Index measures the entire U.S. stock market and tracks more than 5,000 stocks. Keep in mind that the Fund’s past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at www.vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447.

Annual Total Returns—Investor Shares

During the periods shown in the bar chart, the highest return for a calendar quarter was 16.95% (quarter ended June 30, 2009), and the lowest return for a quarter was –22.73% (quarter ended December 31, 2008).

Average Annual Total Returns for Periods Ended December 31, 2009


	1 Year	5 Years	10 Years
Vanguard Total Stock Market Index Fund Investor Shares	28.70%	0.91%	–0.27%
Comparative Indexes
(reflect no deduction for fees or expenses)
Dow Jones U.S. Total Stock Market Index	29.35%	1.09%	–0.17%
Spliced Total Stock Market Index	28.76	0.99	–0.22
MSCI US Broad Market Index	28.76	1.05	—

Investment Advisor

The Vanguard Group, Inc.

Portfolio Manager

Gerard C. O’Reilly, Principal of Vanguard. He has managed the Fund since 1994.

Tax Information

The Fund’s distributions will be reinvested in additional Fund shares and accumulate on a tax-deferred basis if you are investing through an employer-sponsored retirement or savings plan. You will not owe taxes on these distributions until you begin withdrawals from the plan. You should consult your plan administrator, your plan’s Summary Plan Description, or your tax advisor about the tax consequences of plan withdrawals.

Payments to Financial Intermediaries

The Fund and its investment advisor do not pay financial intermediaries for sales of Fund shares or related services.

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Vanguard Total Stock Market Index Fund Investor Shares—Fund Number 85

The Funds or securities referred to herein are not sponsored, endorsed, or promoted by MSCI, and MSCI bears no liability with respect to any such funds or securities. For any such funds or securities, the Statement of Additional Information contains a more detailed description of the limited relationship MSCI has with The Vanguard Group and any related funds.

SPI085 042010