Vanguard U.S. Sector Index Funds

Vanguard U.S. Sector Index Funds Supplement to the Prospectus and Summary Prospectus Dated December 22, 2016 Prospectus and Summary Prospectus Text Changes The following replaces similar text under the heading Investment Advisor for Vanguard Consumer Discretionary Index Fund, Vanguard Consumer Staples Index Fund, and Vanguard Utilities Index Fund: Portfolio Managers Michael A. Johnson, Portfolio Manager at Vanguard. He has managed the Fund since 2010 (co-managed since 2015). Awais Khan, CFA, Portfolio Manager at Vanguard. He has co-managed the Fund since 2017. The following replaces similar text under the heading Investment Advisor for Vanguard Energy Index Fund: Portfolio Managers William Coleman, CFA, Portfolio Manager at Vanguard. He has co-managed the Fund since 2015. Awais Khan, CFA, Portfolio Manager at Vanguard. He has co-managed the Fund since 2017. The following replaces similar text under the heading Investment Advisor for Vanguard Telecommunication Services Index Fund: Portfolio Managers Awais Khan, CFA, Portfolio Manager at Vanguard. He has co-managed the Fund since 2017. Walter Nejman, Portfolio Manager at Vanguard. He has co-managed the Fund since 2015.

The following replaces similar text under the heading Investment Advisor for Vanguard Health Care Index Fund and Vanguard Industrials Index Fund: Portfolio Managers Michelle Louie, CFA, Portfolio Manager at Vanguard. She has co-managed the Fund since 2017. Walter Nejman, Portfolio Manager at Vanguard. He has co-managed the Fund since 2015. The following replaces similar text under the heading Investment Advisor for Vanguard Financials Index Fund and Vanguard Materials Index Fund: Portfolio Managers William Coleman, CFA, Portfolio Manager at Vanguard. He has co-managed the Fund since 2015. Michelle Louie, CFA, Portfolio Manager at Vanguard. She has co-managed the Fund since 2017. The following replaces similar text under the heading Investment Advisor for Vanguard Information Technology Index Fund: Portfolio Managers Michael A. Johnson, Portfolio Manager at Vanguard. He has co-managed the Fund since 2017. Walter Nejman, Portfolio Manager at Vanguard. He has co-managed the Fund since 2015. Prospectus Text Changes The following replaces similar text under the heading Investment Advisor: The managers primarily responsible for the day-to-day management of the Funds are: William Coleman, CFA, Portfolio Manager at Vanguard. He has worked in investment management since joining Vanguard in 2006 and has co-managed the Energy Index, Financials Index, and Materials Index Funds since 2015. Education: B.S., King s College; M.S., Saint Joseph s University. Michael A. Johnson, Portfolio Manager at Vanguard. He has been with Vanguard since 1999; has worked in investment management since 2007; has managed investment portfolios, including the Consumer Discretionary Index and Consumer Staples Index Funds, since 2010 (co-managed since 2015); has co-managed the Utilities Index Fund since 2015; and has co-managed the Information Technology Index Fund since 2017. Education: B.S.B.A., Shippensburg University.

Awais Khan, CFA, Portfolio Manager at Vanguard. He has been with Vanguard since 2010; has worked in investment management since 2012; and has comanaged the Consumer Discretionary Index, Consumer Staples Index, Energy Index, Telecommunication Services Index, and Utilities Index Funds since 2017. Education: B.S./B.S.B.A., University of North Carolina. Michelle Louie, CFA, Portfolio Manager at Vanguard. She has been with Vanguard since 2010; has worked in investment management since 2012; has managed investment portfolios since 2016; and has co-managed the Financials Index, Health Care Index, Industrials Index, and Materials Index Funds since 2017. Education: B.S., The American University; M.B.A., The Georgia Institute of Technology. Walter Nejman, Portfolio Manager at Vanguard. He has been with Vanguard since 2005; has worked in investment management since 2008; and has comanaged the Health Care Index, Industrials Index, Information Technology Index, and Telecommunication Services Index Funds since 2015. Education: B.A., Arcadia University; M.B.A., Villanova University.

Vanguard Funds Supplement to the Prospectus At a special meeting held on November 15, 2017, shareholders of the Vanguard funds voted on several proposed changes to the funds. As a result, the following change is applicable to each Fund listed on the cover of the prospectus. Prospectus Text Change The following is added to (or, for certain Funds, replaces similar text within) the Investment Advisor(s) section: Under the terms of an SEC exemption, the Fund s board of trustees may, without prior approval from shareholders, change the terms of an advisory agreement with a third-party investment advisor or hire a new third-party investment advisor either as a replacement for an existing advisor or as an additional advisor. Any significant change in the Fund s advisory arrangements will be communicated to shareholders in writing. As the Fund s sponsor and overall manager, Vanguard may provide additional investment advisory services to the Fund, on an at cost basis, at any time. Vanguard may also recommend to the board of trustees that an advisor be hired, terminated, or replaced or that the terms of an existing advisory agreement be revised. The Fund has filed an application seeking a similar SEC exemption with respect to investment advisors that are wholly-owned subsidiaries of Vanguard. If granted, the Fund may rely on the new SEC relief. 2017 The Vanguard Group, Inc. All rights reserved. Vanguard Marketing Corporation, Distributor. PS MMS 112017

Vanguard U.S. Sector ETFs Prospectus December 22, 2016 Exchange-traded fund shares that are not individually redeemable and are listed on NYSE Arca Vanguard Consumer Discretionary Index Fund ETF Shares (VCR) Vanguard Consumer Staples Index Fund ETF Shares (VDC) Vanguard Energy Index Fund ETF Shares (VDE) Vanguard Financials Index Fund ETF Shares (VFH) Vanguard Health Care Index Fund ETF Shares (VHT) Vanguard Industrials Index Fund ETF Shares (VIS) Vanguard Information Technology Index Fund ETF Shares (VGT) Vanguard Materials Index Fund ETF Shares (VAW) Vanguard Telecommunication Services Index Fund ETF Shares (VOX) Vanguard Utilities Index Fund ETF Shares (VPU) This prospectus contains financial data for the Funds through the fiscal year ended August 31, 2016. The Securities and Exchange Commission (SEC) has not approved or disapproved these securities or passed upon the adequacy of this prospectus. Any representation to the contrary is a criminal offense.

Contents Vanguard ETF Summaries Investing in Vanguard ETF Shares 61 Consumer Discretionary ETF 1 Investing in Index Funds 63 Consumer Staples ETF 7 More on the Funds and ETF Shares 65 Energy ETF 13 The Funds and Vanguard 75 Financials ETF 19 Investment Advisor 75 Health Care ETF 25 Dividends, Capital Gains, and Taxes 76 Industrials ETF 31 Share Price and Market Price 78 Information Technology ETF 37 Additional Information 80 Materials ETF 43 Financial Highlights 81 Telecommunication Services ETF 49 Glossary of Investment Terms 93 Utilities ETF 55

Vanguard Consumer Discretionary ETF Investment Objective The Fund seeks to track the performance of a benchmark index that measures the investment return of consumer discretionary stocks. Fees and Expenses The following table describes the fees and expenses you may pay if you buy and hold ETF Shares of the Fund. Shareholder Fees (Fees paid directly from your investment) Transaction Fee on Purchases and Sales Transaction Fee on Reinvested Dividends Transaction Fee on Conversion to ETF Shares None through Vanguard (Broker fees vary) None through Vanguard (Broker fees vary) None through Vanguard (Broker fees vary) Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment) Management Fees 0.08% 12b-1 Distribution Fee None Other Expenses 0.02% Total Annual Fund Operating Expenses 0.10% 1

Example The following example is intended to help you compare the cost of investing in the Fund s ETF Shares with the cost of investing in other funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund s shares. This example assumes that the shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses 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 $10 $32 $56 $128 This example does not include the brokerage commissions that you may pay to buy and sell ETF Shares of the Fund. 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 more 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, reduce the Fund s performance. During the most recent fiscal year, the Fund s portfolio turnover rate was 7% of the average value of its portfolio. Principal Investment Strategies The Fund employs an indexing investment approach designed to track the performance of the MSCI US Investable Market Index (IMI)/Consumer Discretionary 25/50, an index made up of stocks of large, mid-size, and small U.S. companies within the consumer discretionary sector, as classified under the Global Industry Classification Standard (GICS). The GICS consumer discretionary sector is made up of those manufacturing and service industries that tend to be the most sensitive to economic cycles. Its manufacturing segment includes the following industries: automotive, household durable goods, textiles and apparel, and leisure equipment. The services segment includes hotels, restaurants and other leisure facilities, media production and services, and consumer retailing. The Fund 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. 2

Principal 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. The Fund is subject to the following risks, which could affect the Fund s performance: 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 tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. Sector risk, which is the chance that significant problems will affect a particular sector, or that returns from that sector will trail returns from the overall stock market. Daily fluctuations in specific market sectors are often more extreme or volatile than fluctuations in the overall market. Because the Fund invests all, or substantially all, of its assets in the consumer discretionary sector, the Fund s performance largely depends for better or for worse on the general condition of that sector. Companies in the consumer discretionary sector could be affected by, among other things, overall economic conditions, interest rates, consumer confidence, and disposable income. Sector risk is expected to be high for the Fund. Nondiversification risk, which is the chance that the Fund s performance may be hurt disproportionately by the poor performance of relatively few stocks or even a single stock. The Fund is considered nondiversified, which means that it may invest a greater percentage of its assets in the securities of a small number of issuers as compared with other mutual funds. Because the Fund tends to invest a relatively high percentage of its assets in its ten largest holdings, fluctuations in the market value of a single Fund holding could cause significant changes to the Fund s share price. Nondiversification risk is expected to be high for the Fund. Investment style risk, which is the chance that returns from the types of stocks in which the Fund invests will trail returns from the overall stock market. Small-, mid-, and large-cap stocks each tend to go through cycles of doing better or worse than other segments of the stock market or the stock market in general. These periods have, in the past, lasted for as long as several years. Historically, small- and mid-cap stocks have been more volatile in price than large-cap stocks. Small and mid-size companies tend to have greater stock volatility because, among other things, these companies are more sensitive to changing economic conditions. Because ETF Shares are traded on an exchange, they are subject to additional risks: The Fund s ETF Shares are listed for trading on NYSE Arca and are bought and sold on the secondary market at market prices. Although it is expected that the market price of an ETF Share typically will approximate its net asset value (NAV), there may be times when the market price and the NAV differ significantly. Thus, you may pay more or less than NAV when you buy ETF Shares on the secondary market, and you may receive more or less than NAV when you sell those shares. 3

Although the Fund s ETF Shares are listed for trading on NYSE Arca, it is possible that an active trading market may not be maintained. Trading of the Fund s ETF Shares may be halted by the activation of individual or marketwide trading halts (which halt trading for a specific period of time when the price of a particular security or overall market prices decline by a specified percentage). Trading of the Fund s ETF Shares may also be halted if (1) the shares are delisted from NYSE Arca without first being listed on another exchange or (2) NYSE Arca officials determine that such action is appropriate in the interest of a fair and orderly market or for the protection of investors. 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 ETF Shares (based on NAV) has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the ETF Shares compare with those of the Fund s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. Annual Total Returns Vanguard Consumer Discretionary Index Fund ETF Shares 1 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 80% 60% 40% 20% 0% -20% -40% -60% 16.52-11.53-38.00 46.52 30.57 3.71 24.72 43.57 9.39 6.35 1 The year-to-date return as of the most recent calendar quarter, which ended on September 30, 2016, was 3.73%. During the periods shown in the bar chart, the highest return for a calendar quarter was 21.04% (quarter ended September 30, 2009), and the lowest return for a quarter was 25.41% (quarter ended December 31, 2008). 4

Average Annual Total Returns for Periods Ended December 31, 2015 Vanguard Consumer Discretionary Index Fund ETF Shares 1 Year 5 Years 10 Years Based on NAV Return Before Taxes 6.35% 16.66% 10.20% Return After Taxes on Distributions 6.01 16.37 9.96 Return After Taxes on Distributions and Sale of Fund Shares 3.86 13.49 8.41 Based on Market Price Return Before Taxes 6.35 16.65 10.20 Comparative Indexes (reflect no deduction for fees, expenses, or taxes) MSCI US IMI/Consumer Discretionary 6.43% 16.78% 10.33% MSCI US IMI/Consumer Discretionary 25/50 6.43 16.78 Spliced US IMI/Consumer Discretionary 25/50 6.43 16.78 10.33 Actual after-tax returns depend on your tax situation and may differ from those shown in the preceding table. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. 5

Investment Advisor The Vanguard Group, Inc. (Vanguard) Portfolio Managers Michael A. Johnson, Portfolio Manager at Vanguard. He has managed the Fund since 2010 (co-managed since 2015). Scott E. Geiger, CFA, Portfolio Manager at Vanguard. He has co-managed the Fund since 2015. Purchase and Sale of Fund Shares You can buy and sell ETF Shares of the Fund through a brokerage firm. The price you pay or receive for ETF Shares will be the prevailing market price, which may be more or less than the NAV of the shares. The brokerage firm may charge you a commission to execute the transaction. Unless imposed by your brokerage firm, there is no minimum dollar amount you must invest and no minimum number of shares you must buy. ETF Shares of the Fund cannot be directly purchased from or redeemed with the Fund, except by certain authorized broker-dealers. These broker-dealers may purchase and redeem ETF Shares only in large blocks (Creation Units) worth several million dollars, typically in exchange for baskets of securities. For this Fund, the number of ETF Shares in a Creation Unit is 25,000. Tax Information The Fund s distributions may be taxable as ordinary income or capital gain. If you are investing through a tax-advantaged account, such as an IRA or an employersponsored retirement or savings plan, special tax rules apply. Payments to Financial Intermediaries The Fund and its investment advisor do not pay financial intermediaries for sales of Fund shares. 6

Vanguard Consumer Staples ETF Investment Objective The Fund seeks to track the performance of a benchmark index that measures the investment return of consumer staples stocks. Fees and Expenses The following table describes the fees and expenses you may pay if you buy and hold ETF Shares of the Fund. Shareholder Fees (Fees paid directly from your investment) Transaction Fee on Purchases and Sales Transaction Fee on Reinvested Dividends Transaction Fee on Conversion to ETF Shares None through Vanguard (Broker fees vary) None through Vanguard (Broker fees vary) None through Vanguard (Broker fees vary) Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment) Management Fees 0.09% 12b-1 Distribution Fee None Other Expenses 0.01% Total Annual Fund Operating Expenses 0.10% 7

Example The following example is intended to help you compare the cost of investing in the Fund s ETF Shares with the cost of investing in other funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund s shares. This example assumes that the shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses 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 $10 $32 $56 $128 This example does not include the brokerage commissions that you may pay to buy and sell ETF Shares of the Fund. 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 more 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, reduce the Fund s performance. During the most recent fiscal year, the Fund s portfolio turnover rate was 6% of the average value of its portfolio. Principal Investment Strategies The Fund employs an indexing investment approach designed to track the performance of the MSCI US Investable Market Index (IMI)/Consumer Staples 25/50, an index made up of stocks of large, mid-size, and small U.S. companies within the consumer staples sector, as classified under the Global Industry Classification Standard (GICS). The GICS consumer staples sector is made up of companies whose businesses are less sensitive to economic cycles. It includes manufacturers and distributors of food, beverages, and tobacco, as well as producers of nondurable household goods and personal products. It also includes food and drug retailing companies as well as consumer supercenters. The Fund 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. 8

Principal 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. The Fund is subject to the following risks, which could affect the Fund s performance: 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 tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. Sector risk, which is the chance that significant problems will affect a particular sector, or that returns from that sector will trail returns from the overall stock market. Daily fluctuations in specific market sectors are often more extreme or volatile than fluctuations in the overall market. Because the Fund invests all, or substantially all, of its assets in the consumer staples sector, the Fund s performance largely depends for better or for worse on the general condition of that sector. Companies in the consumer staples sector could be affected by, among other things, consumer tastes, government regulation, marketing, and consumer confidence. Sector risk is expected to be high for the Fund. Nondiversification risk, which is the chance that the Fund s performance may be hurt disproportionately by the poor performance of relatively few stocks or even a single stock. The Fund is considered nondiversified, which means that it may invest a greater percentage of its assets in the securities of a small number of issuers as compared with other mutual funds. Because the Fund tends to invest a relatively high percentage of its assets in its ten largest holdings, fluctuations in the market value of a single Fund holding could cause significant changes to the Fund s share price. Nondiversification risk is expected to be high for the Fund. Investment style risk, which is the chance that returns from the types of stocks in which the Fund invests will trail returns from the overall stock market. Small-, mid-, and large-cap stocks each tend to go through cycles of doing better or worse than other segments of the stock market or the stock market in general. These periods have, in the past, lasted for as long as several years. Historically, small- and mid-cap stocks have been more volatile in price than large-cap stocks. Small and mid-size companies tend to have greater stock volatility because, among other things, these companies are more sensitive to changing economic conditions. Because ETF Shares are traded on an exchange, they are subject to additional risks: The Fund s ETF Shares are listed for trading on NYSE Arca and are bought and sold on the secondary market at market prices. Although it is expected that the market price of an ETF Share typically will approximate its net asset value (NAV), there may be times when the market price and the NAV differ significantly. Thus, you may pay more or less than NAV when you buy ETF Shares on the secondary market, and you may receive more or less than NAV when you sell those shares. 9

Although the Fund s ETF Shares are listed for trading on NYSE Arca, it is possible that an active trading market may not be maintained. Trading of the Fund s ETF Shares may be halted by the activation of individual or marketwide trading halts (which halt trading for a specific period of time when the price of a particular security or overall market prices decline by a specified percentage). Trading of the Fund s ETF Shares may also be halted if (1) the shares are delisted from NYSE Arca without first being listed on another exchange or (2) NYSE Arca officials determine that such action is appropriate in the interest of a fair and orderly market or for the protection of investors. 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 ETF Shares (based on NAV) has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the ETF Shares compare with those of the Fund s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. Annual Total Returns Vanguard Consumer Staples Index Fund ETF Shares 1 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 80% 60% 40% 20% 0% -20% -40% -60% 15.81 12.92-16.95 16.95 14.44 13.64 11.07 27.99 15.79 6.00 1 The year-to-date return as of the most recent calendar quarter, which ended on September 30, 2016, was 7.84%. During the periods shown in the bar chart, the highest return for a calendar quarter was 14.55% (quarter ended March 31, 2013), and the lowest return for a quarter was 13.15% (quarter ended December 31, 2008). 10

Average Annual Total Returns for Periods Ended December 31, 2015 Vanguard Consumer Staples Index Fund ETF Shares 1 Year 5 Years 10 Years Based on NAV Return Before Taxes 6.00% 14.67% 11.17% Return After Taxes on Distributions 5.34 14.13 10.73 Return After Taxes on Distributions and Sale of Fund Shares 3.90 11.81 9.26 Based on Market Price Return Before Taxes 6.02 14.66 11.17 Comparative Indexes (reflect no deduction for fees, expenses, or taxes) MSCI US IMI/Consumer Staples 5.81% 14.60% 11.10% MSCI US IMI/Consumer Staples 25/50 6.04 14.82 Spliced US IMI/Consumer Staples 25/50 6.04 14.82 11.21 Actual after-tax returns depend on your tax situation and may differ from those shown in the preceding table. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. 11

Vanguard Energy ETF Investment Objective The Fund seeks to track the performance of a benchmark index that measures the investment return of energy stocks. Fees and Expenses The following table describes the fees and expenses you may pay if you buy and hold ETF Shares of the Fund. Shareholder Fees (Fees paid directly from your investment) Transaction Fee on Purchases and Sales Transaction Fee on Reinvested Dividends Transaction Fee on Conversion to ETF Shares None through Vanguard (Broker fees vary) None through Vanguard (Broker fees vary) None through Vanguard (Broker fees vary) Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment) Management Fees 0.08% 12b-1 Distribution Fee None Other Expenses 0.02% Total Annual Fund Operating Expenses 0.10% 13

Example The following example is intended to help you compare the cost of investing in the Fund s ETF Shares with the cost of investing in other funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund s shares. This example assumes that the shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses 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 $10 $32 $56 $128 This example does not include the brokerage commissions that you may pay to buy and sell ETF Shares of the Fund. 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 more 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, reduce the Fund s performance. During the most recent fiscal year, the Fund s portfolio turnover rate was 15% of the average value of its portfolio. Principal Investment Strategies The Fund employs an indexing investment approach designed to track the performance of the MSCI US Investable Market Index (IMI)/Energy 25/50, an index made up of stocks of large, mid-size, and small U.S. companies within the energy sector, as classified under the Global Industry Classification Standard (GICS). The GICS energy sector is made up of companies whose businesses are dominated by either of the following activities: the construction or provision of oil rigs, drilling equipment, and other energy-related equipment and services (such as seismic data collection) or companies engaged in the exploration, production, marketing, refining, and/or transportation of oil and gas products. The Fund 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. 14

Principal 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. The Fund is subject to the following risks, which could affect the Fund s performance: 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 tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. Sector risk, which is the chance that significant problems will affect a particular sector, or that returns from that sector will trail returns from the overall stock market. Daily fluctuations in specific market sectors are often more extreme or volatile than fluctuations in the overall market. Because the Fund invests all, or substantially all, of its assets in the energy sector, the Fund s performance largely depends for better or for worse on the general condition of that sector. Companies in the energy sector could be affected by, among other things, geopolitical events, government regulation, economic cycles, and fuel prices. Sector risk is expected to be high for the Fund. Nondiversification risk, which is the chance that the Fund s performance may be hurt disproportionately by the poor performance of relatively few stocks or even a single stock. The Fund is considered nondiversified, which means that it may invest a greater percentage of its assets in the securities of a small number of issuers as compared with other mutual funds. Because the Fund tends to invest a relatively high percentage of its assets in its ten largest holdings, fluctuations in the market value of a single Fund holding could cause significant changes to the Fund s share price. Nondiversification risk is expected to be high for the Fund. Investment style risk, which is the chance that returns from the types of stocks in which the Fund invests will trail returns from the overall stock market. Small-, mid-, and large-cap stocks each tend to go through cycles of doing better or worse than other segments of the stock market or the stock market in general. These periods have, in the past, lasted for as long as several years. Historically, small- and mid-cap stocks have been more volatile in price than large-cap stocks. Small and mid-size companies tend to have greater stock volatility because, among other things, these companies are more sensitive to changing economic conditions. Because ETF Shares are traded on an exchange, they are subject to additional risks: The Fund s ETF Shares are listed for trading on NYSE Arca and are bought and sold on the secondary market at market prices. Although it is expected that the market price of an ETF Share typically will approximate its net asset value (NAV), there may be times when the market price and the NAV differ significantly. Thus, you may pay more or less than NAV when you buy ETF Shares on the secondary market, and you may receive more or less than NAV when you sell those shares. 15

Although the Fund s ETF Shares are listed for trading on NYSE Arca, it is possible that an active trading market may not be maintained. Trading of the Fund s ETF Shares may be halted by the activation of individual or marketwide trading halts (which halt trading for a specific period of time when the price of a particular security or overall market prices decline by a specified percentage). Trading of the Fund s ETF Shares may also be halted if (1) the shares are delisted from NYSE Arca without first being listed on another exchange or (2) NYSE Arca officials determine that such action is appropriate in the interest of a fair and orderly market or for the protection of investors. 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 ETF Shares (based on NAV) has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the ETF Shares compare with those of the Fund s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. Annual Total Returns Vanguard Energy Index Fund ETF Shares 1 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 80% 60% 40% 20% 0% -20% -40% -60% 18.98 34.87-39.31 24.90 21.09 2.80 3.46 25.78-9.92-23.22 1 The year-to-date return as of the most recent calendar quarter, which ended on September 30, 2016, was 19.84%. During the periods shown in the bar chart, the highest return for a calendar quarter was 21.97% (quarter ended December 31, 2010), and the lowest return for a quarter was 27.62% (quarter ended September 30, 2008). 16

Average Annual Total Returns for Periods Ended December 31, 2015 Vanguard Energy Index Fund ETF Shares 1 Year 5 Years 10 Years Based on NAV Return Before Taxes 23.22% 1.54% 3.14% Return After Taxes on Distributions 23.77 1.96 2.83 Return After Taxes on Distributions and Sale of Fund Shares 12.67 1.04 2.59 Based on Market Price Return Before Taxes 23.21 1.55 3.14 Comparative Indexes (reflect no deduction for fees, expenses, or taxes) MSCI US IMI/Energy 23.16% 1.34% 3.32% MSCI US IMI/Energy 25/50 23.20 1.45 Spliced US IMI/Energy 25/50 23.20 1.45 3.28 Actual after-tax returns depend on your tax situation and may differ from those shown in the preceding table. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. 17

Investment Advisor The Vanguard Group, Inc. (Vanguard) Portfolio Managers William Coleman, CFA, Portfolio Manager at Vanguard. He has co-managed the Fund since 2015. Scott E. Geiger, CFA, Portfolio Manager at Vanguard. He has co-managed the Fund since 2015. Purchase and Sale of Fund Shares You can buy and sell ETF Shares of the Fund through a brokerage firm. The price you pay or receive for ETF Shares will be the prevailing market price, which may be more or less than the NAV of the shares. The brokerage firm may charge you a commission to execute the transaction. Unless imposed by your brokerage firm, there is no minimum dollar amount you must invest and no minimum number of shares you must buy. ETF Shares of the Fund cannot be directly purchased from or redeemed with the Fund, except by certain authorized broker-dealers. These broker-dealers may purchase and redeem ETF Shares only in large blocks (Creation Units) worth several million dollars, typically in exchange for baskets of securities. For this Fund, the number of ETF Shares in a Creation Unit is 25,000. Tax Information The Fund s distributions may be taxable as ordinary income or capital gain. If you are investing through a tax-advantaged account, such as an IRA or an employersponsored retirement or savings plan, special tax rules apply. Payments to Financial Intermediaries The Fund and its investment advisor do not pay financial intermediaries for sales of Fund shares. 18

Vanguard Financials ETF Investment Objective The Fund seeks to track the performance of a benchmark index that measures the investment return of financial stocks. Fees and Expenses The following table describes the fees and expenses you may pay if you buy and hold ETF Shares of the Fund. Shareholder Fees (Fees paid directly from your investment) Transaction Fee on Purchases and Sales Transaction Fee on Reinvested Dividends Transaction Fee on Conversion to ETF Shares None through Vanguard (Broker fees vary) None through Vanguard (Broker fees vary) None through Vanguard (Broker fees vary) Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment) Management Fees 0.08% 12b-1 Distribution Fee None Other Expenses 0.02% Total Annual Fund Operating Expenses 0.10% 19

Example The following example is intended to help you compare the cost of investing in the Fund s ETF Shares with the cost of investing in other funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund s shares. This example assumes that the shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses 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 $10 $32 $56 $128 This example does not include the brokerage commissions that you may pay to buy and sell ETF Shares of the Fund. 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 more 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, reduce the Fund s performance. During the most recent fiscal year, the Fund s portfolio turnover rate was 21% of the average value of its portfolio. Principal Investment Strategies The Fund employs an indexing investment approach designed to track the performance of the MSCI US Investable Market Index (IMI)/Financials 25/50, an index made up of stocks of large, mid-size, and small U.S. companies within the financials sector, as classified under the Global Industry Classification Standard (GICS). The GICS financials sector is made up of companies involved in activities such as banking, mortgage finance (including mortgage real estate investment trusts), consumer finance, specialized finance, investment banking and brokerage, asset management and custody, corporate lending, insurance, and financial investment. The Fund 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. 20

Principal 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. The Fund is subject to the following risks, which could affect the Fund s performance: 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 tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. Sector risk, which is the chance that significant problems will affect a particular sector, or that returns from that sector will trail returns from the overall stock market. Daily fluctuations in specific market sectors are often more extreme or volatile than fluctuations in the overall market. Because the Fund invests all, or substantially all, of its assets in the financials sector, the Fund s performance largely depends for better or for worse on the general condition of that sector. Companies in the financials sector could be affected by, among other things, government regulation, interest rates, cost of capital funds, credit losses, and financial markets. Sector risk is expected to be high for the Fund. Nondiversification risk, which is the chance that the Fund s performance may be hurt disproportionately by the poor performance of relatively few stocks or even a single stock. The Fund is considered nondiversified, which means that it may invest a greater percentage of its assets in the securities of a small number of issuers as compared with other mutual funds. Because the Fund tends to invest a relatively high percentage of its assets in its ten largest holdings, fluctuations in the market value of a single Fund holding could cause significant changes to the Fund s share price. Nondiversification risk is expected to be high for the Fund. Investment style risk, which is the chance that returns from the types of stocks in which the Fund invests will trail returns from the overall stock market. Small-, mid-, and large-cap stocks each tend to go through cycles of doing better or worse than other segments of the stock market or the stock market in general. These periods have, in the past, lasted for as long as several years. Historically, small- and mid-cap stocks have been more volatile in price than large-cap stocks. Small and mid-size companies tend to have greater stock volatility because, among other things, these companies are more sensitive to changing economic conditions. Because ETF Shares are traded on an exchange, they are subject to additional risks: The Fund s ETF Shares are listed for trading on NYSE Arca and are bought and sold on the secondary market at market prices. Although it is expected that the market price of an ETF Share typically will approximate its net asset value (NAV), there may be times when the market price and the NAV differ significantly. Thus, you may pay more or less than NAV when you buy ETF Shares on the secondary market, and you may receive more or less than NAV when you sell those shares. 21

Although the Fund s ETF Shares are listed for trading on NYSE Arca, it is possible that an active trading market may not be maintained. Trading of the Fund s ETF Shares may be halted by the activation of individual or marketwide trading halts (which halt trading for a specific period of time when the price of a particular security or overall market prices decline by a specified percentage). Trading of the Fund s ETF Shares may also be halted if (1) the shares are delisted from NYSE Arca without first being listed on another exchange or (2) NYSE Arca officials determine that such action is appropriate in the interest of a fair and orderly market or for the protection of investors. 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 ETF Shares (based on NAV) has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the ETF Shares compare with those of the Fund s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. Annual Total Returns Vanguard Financials Index Fund ETF Shares 1 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 80% 60% 40% 20% 0% -20% -40% -60% 19.25-17.42-49.09 14.81 14.74-14.35 26.26 33.00 13.95-0.46 1 The year-to-date return as of the most recent calendar quarter, which ended on September 30, 2016, was 3.34%. During the periods shown in the bar chart, the highest return for a calendar quarter was 28.84% (quarter ended June 30, 2009), and the lowest return for a quarter was 33.25% (quarter ended December 31, 2008). 22

Average Annual Total Returns for Periods Ended December 31, 2015 Vanguard Financials Index Fund ETF Shares 1 Year 5 Years 10 Years Based on NAV Return Before Taxes 0.46% 10.28% 0.75% Return After Taxes on Distributions 1.06 9.69 0.26 Return After Taxes on Distributions and Sale of Fund Shares 0.01 8.00 0.51 Based on Market Price Return Before Taxes 0.49 10.27 0.74 Comparative Indexes (reflect no deduction for fees, expenses, or taxes) MSCI US IMI/Financials 0.40% 10.39% 0.80% MSCI US IMI/Financials 25/50 0.40 10.39 Spliced US IMI/Financials 25/50 0.40 10.39 0.80 Actual after-tax returns depend on your tax situation and may differ from those shown in the preceding table. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. 23