0000205323 fcst6:S000016687Member 2012-01-30 2013-01-29 0000205323 2012-01-30 2013-01-29 0000205323 fcst6:S000006010Member 2012-01-30 2013-01-29 0000205323 fcst6:S000006010Member fcst6:C000016526Member 2012-01-30 2013-01-29 0000205323 fcst6:S000016687Member fcst6:ReturnBeforeTaxesMember fcst6:C000046625Member 2012-01-30 2013-01-29 0000205323 fcst6:S000016687Member rr:AfterTaxesOnDistributionsMember fcst6:C000046625Member 2012-01-30 2013-01-29 0000205323 fcst6:S000016687Member rr:AfterTaxesOnDistributionsAndSalesMember fcst6:C000046625Member 2012-01-30 2013-01-29 0000205323 fcst6:S000016687Member fcst6:SandpOneHundredIndexMember 2012-01-30 2013-01-29 0000205323 fcst6:S000016687Member fcst6:C000046625Member 2012-01-30 2013-01-29 0000205323 fcst6:S000006010Member fcst6:ReturnBeforeTaxesMember fcst6:C000016526Member 2012-01-30 2013-01-29 0000205323 fcst6:S000006010Member rr:AfterTaxesOnDistributionsMember fcst6:C000016526Member 2012-01-30 2013-01-29 0000205323 fcst6:S000006010Member rr:AfterTaxesOnDistributionsAndSalesMember fcst6:C000016526Member 2012-01-30 2013-01-29 0000205323 fcst6:S000006010Member fcst6:NasdaqCompositeIndexMember 2012-01-30 2013-01-29 0000205323 fcst6:S000006011Member 2012-01-30 2013-01-29 0000205323 fcst6:S000006011Member fcst6:C000016527Member 2012-01-30 2013-01-29 0000205323 fcst6:S000006011Member fcst6:ReturnBeforeTaxesMember fcst6:C000016527Member 2012-01-30 2013-01-29 0000205323 fcst6:S000006011Member rr:AfterTaxesOnDistributionsMember fcst6:C000016527Member 2012-01-30 2013-01-29 0000205323 fcst6:S000006011Member rr:AfterTaxesOnDistributionsAndSalesMember fcst6:C000016527Member 2012-01-30 2013-01-29 0000205323 fcst6:S000006011Member fcst6:NasdaqCompositeIndexMember 2012-01-30 2013-01-29 pure iso4217:USD <div style="display:none">~ http://www.fidelity.com/role/ScheduleShareholderFeesFidelitySeries100IndexFund column period compact * ~</div> <div style="display:none">~ http://www.fidelity.com/role/ScheduleAnnualFundOperatingExpensesFidelitySeries100IndexFund column period compact * ~</div> <div style="display:none">~ http://www.fidelity.com/role/ScheduleAverageAnnualTotalReturnsTransposedFidelitySeries100IndexFund column period compact * ~</div> 2013-01-28 2013-01-29 2012-11-30 false 2013-01-29 485BPOS FIDELITY COMMONWEALTH TRUST 0000205323 Fund Summary Fund: Fidelity® Series 100 Index Fund Investment Objective The fund seeks to provide investment results that correspond to the total return of stocks of large capitalization United States companies. Fee Table The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund. Shareholder fees (fees paid directly from your investment) Annual fund operating expenses (expenses that you pay each year as a % of the value of your investment) Portfolio Turnover This example helps compare the cost of investing in the fund with the cost of investing in other mutual funds. Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated: 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 operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 10% of the average value of its portfolio. Principal Investment Strategies <ul><li>Normally investing at least 80% of assets in common stocks included in the S&P 100® Index.</li></ul> Principal Investment Risks <ul><li>Stock Market Volatility. Stock markets, especially foreign markets, are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market and different types of securities can react differently to these developments.</li><li>Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole.</li><li>Correlation to Index. The performance of the fund and its index may vary somewhat due to factors such as transaction costs, sample selection, and timing differences associated with additions to and deletions from its index.</li></ul>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. You could lose money by investing in the fund. 0.1 <div style="display:none">~ http://www.fidelity.com/role/ScheduleShareholderFeesFidelityNASDAQCompositeIndexFund column period compact * ~</div> <div style="display:none">~ http://www.fidelity.com/role/ScheduleAnnualFundOperatingExpensesFidelityNASDAQCompositeIndexFund column period compact * ~</div> <div style="display:none">~ http://www.fidelity.com/role/ScheduleAverageAnnualTotalReturnsTransposedFidelityNASDAQCompositeIndexFund column period compact * ~</div> 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. You could lose money by investing in the fund. Fund Summary Fund: Fidelity® Nasdaq Composite Index® Fund Investment Objective Fee Table The fund seeks to provide investment returns that closely correspond to the price and yield performance of the Nasdaq Composite Index® (Index). The following table describes the fees and expenses that may be incurred when you buy, hold, or sell shares of the fund. Shareholder fees (fees paid directly from your investment) -0.0075 Annual fund operating expenses (expenses that you pay each year as a % of the value of your investment) 0.0024 0.0006 0.0028 0.0006 0.0022 0.0058 -0.0023 0.0035 January 31, 2014 This example helps compare the cost of investing in the fund with the cost of investing in other mutual funds. Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated: Portfolio Turnover Performance 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 operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 10% of the average value of its portfolio. 0.1 Principal Investment Strategies The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index over various periods of time. The index description appears in the Additional Information about the Index section of the prospectus. Past performance (before and after taxes) is not an indication of future performance. Visit www.fidelity.com for updated return information. www.fidelity.com The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index over various periods of time. Past performance (before and after taxes) is not an indication of future performance. Year-by-Year Returns Calendar Years <table border="1" width="95%"><tr><td><div align="left">During the periods shown in the chart: </div></td><td valign="bottom" align="center"><div align="center">Returns </div></td><td valign="bottom" align="center"><div align="center">Quarter ended</div></td></tr><tr><td><div align="left">Highest Quarter Return </div></td><td><div align="right">14.70% </div></td><td><div align="left">June 30, 2009</div></td></tr><tr><td><div align="left">Lowest Quarter Return </div></td><td><div align="right">-20.15% </div></td><td><div align="left">December 31, 2008</div></td></tr></table> <ul><li>Using statistical sampling techniques that take into account such factors as capitalization, industry exposures, dividend yield, price/earnings (P/E) ratio, price/book (P/B) ratio, and earnings growth to create a portfolio of securities listed in the Index that have a similar investment profile to the entire Index.</li><li>Normally investing at least 80% of assets in common stocks included in the Index.</li><li>Lending securities to earn income for the fund.</li></ul> Average Annual Returns After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement. Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares. For the periods ended December 31, 2012 36 After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement. 159 Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares. 297 700 Principal Investment Risks <ul><li>Stock Market Volatility. Stock markets and, as a result, stock market indexes, are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market and different types of securities can react differently to these developments. See the statement of additional information (SAI) for a description of market sectors making up the Index.</li><li>Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.</li><li>Correlation to Index. The performance of the fund and the Index may vary somewhat due to factors such as transaction costs, sample selection, and timing differences associated with additions to and deletions from the Index.</li></ul>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. You could lose money by investing in the fund. 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. You could lose money by investing in the fund. 0.1577 0.1442 0.1205 0.1605 Performance 0.0111 0.0059 0.0088 0.0128 The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index over various periods of time. The index description appears in the Additional Information about the Index section of the prospectus. Past performance (before and after taxes) is not an indication of future performance. Visit www.fidelity.com for updated return information. 0.0217 0.0169 0.018 0.0232 The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index over various periods of time. Past performance (before and after taxes) is not an indication of future performance. www.fidelity.com Year-by-Year Returns Calendar Years Fidelity Series 100 Index Fund Fidelity Series 100 Index Fund Fidelity Series 100 Index Fund Return Before Taxes Return After Taxes on Distributions Return After Taxes on Distributions and Sale of Fund Shares S&P 100® Index 0.086 0.019 0.1003 0.105 -0.4004 0.4496 0.1781 -0.0096 0.1733 2007-03-29 2007-03-29 2007-03-29 2007-03-29 <table border="1" width="95%"><tr><td><div align="left">During the periods shown in the chart: </div></td><td valign="bottom" align="center"><div align="center">Returns </div></td><td valign="bottom" align="center"><div align="center">Quarter ended</div></td></tr><tr><td><div align="left">Highest Quarter Return </div></td><td><div align="right">20.14% </div></td><td><div align="left">June 30, 2009</div></td></tr><tr><td><div align="left">Lowest Quarter Return </div></td><td><div align="right">-24.36% </div></td><td><div align="left">December 31, 2008</div></td></tr></table> Highest Quarter Return 2009-06-30 0.2014 Lowest Quarter Return 2008-12-31 -0.2436 Average Annual Returns After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement. For the periods ended December 31, 2012 After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement. 0.00 0.002 0 0 0.002 20 64 113 255 0.1733 0.1712 0.1153 0.1745 -0.3544 0.2214 0.0354 0.0341 0.0301 0.0368 0.1239 0.0298 0.0631 0.0613 0.0549 0.0654 0.1577 Highest Quarter Return 0.147 2003-09-25 2003-09-25 2009-06-30 2003-09-25 2003-09-25 Lowest Quarter Return Fidelity Nasdaq Composite Index Fund Fidelity Nasdaq Composite Index Fund Fidelity Nasdaq Composite Index Fund Return Before Taxes Return After Taxes on Distributions Return After Taxes on Distributions and Sale of Fund Shares Nasdaq Composite Index® -0.2015 2008-12-31 <div style="display:none">~ http://www.fidelity.com/role/ScheduleAnnualTotalReturnsFidelitySeries100IndexFundBarChart column period compact * ~</div> <div style="display:none">~ http://www.fidelity.com/role/ScheduleExpenseExampleFidelitySeries100IndexFund column period compact * ~</div> <div style="display:none">~ http://www.fidelity.com/role/ScheduleShareholderFeesFidelityNASDAQCompositeIndexTrackingStock column period compact * ~</div> <div style="display:none">~ http://www.fidelity.com/role/ScheduleAnnualFundOperatingExpensesFidelityNASDAQCompositeIndexTrackingStock column period compact * ~</div> <div style="display:none">~ http://www.fidelity.com/role/ScheduleAverageAnnualTotalReturnsTransposedFidelityNASDAQCompositeIndexTrackingStock column period compact * ~</div> Fund Summary Fund: Fidelity® Nasdaq Composite Index® Tracking Stock Investment Objective Fidelity Nasdaq Composite Index Tracking Stock is an exchange-traded fund. The fund seeks to provide investment returns that closely correspond to the price and yield performance of the Nasdaq Composite Index® (Index). Fee Table The following table describes the fees and expenses that are incurred when you buy and hold shares of the fund. Shareholder fees (fees paid directly from your investment) Annual fund operating expenses (expenses that you pay each year as a % of the value of your investment) 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 operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 10% of the average value of its portfolio. This example helps compare the cost of investing in the fund with the cost of investing in other funds. Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated: Principal Investment Strategies <ul><li>Using statistical sampling techniques that take into account such factors as capitalization, industry exposures, dividend yield, price/earnings (P/E) ratio, price/book (P/B) ratio, and earnings growth to create a portfolio of securities listed in the Index that have a similar investment profile to the entire Index. </li><li>Investing at least 80% of assets in common stocks included in the Index. </li><li>Lending securities to earn income for the fund. </li></ul> Principal Investment Risks <ul><li>Stock Market Volatility. Stock markets and, as a result, stock market indexes, are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market and different types of securities can react differently to these developments. See the statement of additional information (SAI) for a description of market sectors making up the Index. </li><li>Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers. </li><li>Fluctuation of Net Asset Value and Share Price. The net asset value per share (NAV) of the fund will generally fluctuate with changes in the market value of the fund's holdings. The fund's shares are listed on Nasdaq® and trade at market prices. Although it is expected that the market price of the fund's shares will approximate the fund's NAV, there is no guarantee that will be the case. </li><li>Correlation to Index. The performance of the fund and the Index may vary somewhat due to factors such as transaction costs, sample selection, and timing differences associated with additions to and deletions from the Index.</li><li>Trading Issues. There can be no assurance that an active trading market will be maintained. Trading may be halted, for example, due to market conditions. </li></ul>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. You could lose money by investing in the fund. Performance The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index over various periods of time. The index description appears in the Additional Information about the Index section of the prospectus. Past performance (before and after taxes) is not an indication of future performance. Visit www.fidelity.com for updated return information. Year-by-Year Returns Calendar Years <table border="1" width="95%"><tr><td><div align="left">During the periods shown in the chart: </div></td><td valign="bottom" align="center"><div align="center">Returns </div></td><td valign="bottom" align="center"><div align="center">Quarter ended</div></td></tr><tr><td><div align="left">Highest Quarter Return </div></td><td><div align="right">20.22% </div></td><td><div align="left">June 30, 2009</div></td></tr><tr><td><div align="left">Lowest Quarter Return </div></td><td><div align="right">-24.28% </div></td><td><div align="left">December 31, 2008</div></td></tr></table> Average Annual Returns After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement. For the periods ended December 31, 2012 0.1 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. You could lose money by investing in the fund. www.fidelity.com The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index over various periods of time. Past performance (before and after taxes) is not an indication of future performance. After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement. 0.00 0.0024 0.0009 0.002 0.0006 0.0014 0.0053 -0.0022 0.0031 32 146 272 642 0.0852 0.0192 0.1018 0.1008 -0.3985 0.4488 0.178 -0.0096 0.1723 Highest Quarter Return 2009-06-30 0.2022 Lowest Quarter Return 2008-12-31 -0.2428 Fidelity Nasdaq Composite Index Tracking Stock Fidelity Nasdaq Composite Index Tracking Stock Fidelity Nasdaq Composite Index Tracking Stock Return Before Taxes Return After Taxes on Distributions Return After Taxes on Distributions and Sale of Fund Shares Nasdaq Composite Index® 0.1723 0.1699 0.1153 0.1745 0.0357 0.0344 0.0304 0.0368 0.063 0.0617 0.0551 0.0654 2003-09-25 2003-09-25 2003-09-25 2003-09-25 <div style="display:none">~ http://www.fidelity.com/role/ScheduleExpenseExampleFidelityNASDAQCompositeIndexTrackingStock column period compact * ~</div> <div style="display:none">~ http://www.fidelity.com/role/ScheduleAnnualTotalReturnsFidelityNASDAQCompositeIndexTrackingStockBarChart column period compact * ~</div> Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses. January 31, 2014 <div style="display:none">~ http://www.fidelity.com/role/ScheduleExpenseExampleFidelityNASDAQCompositeIndexFund column period compact * ~</div> <div style="display:none">~ http://www.fidelity.com/role/ScheduleAnnualTotalReturnsFidelityNASDAQCompositeIndexFundBarChart column period compact * ~</div> Fidelity Management & Research Company (FMR) has contractually agreed to waive the fund's expenses to the extent that total operating expenses (excluding interest, taxes, certain securities lending costs, brokerage commissions, extraordinary expenses, and acquired fund fees and expenses, if any), as a percentage of its average net assets, exceed 0.35%. This arrangement will remain in effect through January 31, 2014. FMR may not terminate this arrangement before the expiration date without the approval of the Board of Trustees. From September 25, 2003. From March 29, 2007. Fidelity Management & Research Company (FMR) has contractually agreed to waive the fund's expenses to the extent that total operating expenses (excluding interest, taxes, certain securities lending costs, brokerage commissions, extraordinary expenses, and acquired fund fees and expenses, if any), as a percentage of its average net assets, exceed 0.30%. This arrangement will remain in effect through January 31, 2014. Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses. For the period, acquired fund fees and expenses are less than 0.01% and are included in other expenses.