Fidelity® Emerging Markets Index Fund Fidelity® Global ex U.S. Index Fund Semi-Annual Report April 30, 2021 Contents Note to Shareholders 3 Fidelity® Emerging Markets Index Fund 4 Investment Summary 5 Schedule of Investments 23 Financial Statements Fidelity® Global ex U.S. Index Fund 27 Investment Summary 28 Schedule of Investments 55 Financial Statements Notes to Financial Statements 59 Shareholder Expense Example 64 Liquidity Risk Management Program 65 To view a fund’s proxy voting guidelines and proxy voting record for the 12-month period ended June 30, visit http://www.fidelity.com/proxyvotingresults or visit the Securities and Exchange Commission’s (SEC) web site at http://www.sec.gov. You may also call 1-800-544-8544 to request a free copy of the proxy voting guidelines. 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This report is not authorized for distribution to prospective investors in the Funds unless preceded or accompanied by an effective prospectus. A fund files its complete schedule of portfolio holdings with the SEC for the first and third quarters of each fiscal year on Form N-PORT. Forms N-PORT are available on the SEC’s web site at http://www.sec.gov. A fund’s Forms N-PORT may be reviewed and copied at the SEC’s Public Reference Room in Washington, DC. Information regarding the operation of the SEC’s Public Reference Room may be obtained by calling 1-800-SEC-0330. For a complete list of a fund’s portfolio holdings, view the most recent holdings listing, semiannual report, or annual report on Fidelity’s web site at http://www.fidelity.com, http://www.institutional.fidelity. com, or http://www.401k.com, as applicable. NOT FDIC INSURED •MAY LOSE VALUE •NO BANK GUARANTEE Neither the Funds nor Fidelity Distributors Corporation is a bank. Semi-Annual Report Note to Shareholders: Early in 2020, the outbreak and spread of a new coronavirus emerged as a public health emergency that had a major influence on financial markets, primarily based on its impact on the global economy and the outlook for corporate earnings. The virus causes a respiratory disease known as COVID-19. On March 11, 2020 the World Health Organization declared the COVID-19 outbreak a pandemic, citing sustained risk of further global spread. In the weeks following, as the crisis worsened, we witnessed an escalating human tragedy with wide-scale social and economic consequences from coronavirus-containment measures. The outbreak of COVID-19 prompted a number of measures to limit the spread, including travel and border restrictions, quarantines, and restrictions on large gatherings. In turn, these resulted in lower consumer activity, diminished demand for a wide range of products and services, disruption in manufacturing and supply chains, and – given the wide variability in outcomes regarding the outbreak – significant market uncertainty and volatility. Amid the turmoil, global governments and central banks took unprecedented action to help support consumers, businesses, and the broader economies, and to limit disruption to financial systems. The situation continues to unfold, and the extent and duration of its impact on financial markets and the economy remain highly uncertain. Extreme events such as the coronavirus crisis are “exogenous shocks” that can have significant adverse effects on mutual funds and their investments. Although multiple asset classes may be affected by market disruption, the duration and impact may not be the same for all types of assets. Fidelity is committed to helping you stay informed amid news about COVID-19 and during increased market volatility, and we’re taking extra steps to be responsive to customer needs. We encour- age you to visit our websites, where we offer ongoing updates, commentary, and analysis on the markets and our funds. 3 Semi-Annual Report Fidelity® Emerging Markets Index Fund Investment Summary (Unaudited) Top Ten Stocks as of April 30, 2021 % of fund’s net assets Taiwan Semiconductor Manufacturing Co. Ltd. (Taiwan, Semiconductors & Semiconductor Equipment) 6.1 Tencent Holdings Ltd. (Cayman Islands, Interactive Media & Services) 5.4 Alibaba Group Holding Ltd. sponsored ADR (Cayman Islands, Internet & Direct Marketing Retail) 5.1 Samsung Electronics Co. Ltd. (Korea (South), Technology Hardware, Storage & Peripherals) 4.1 Meituan Class B (Cayman Islands, Internet & Direct Marketing Retail) 1.6 Naspers Ltd. Class N (South Africa, Internet & Direct Marketing Retail) 1.2 Reliance Industries Ltd. (India, Oil, Gas & Consumable Fuels) 0.9 China Construction Bank Corp. (H Shares) (China, Banks) 0.9 Vale SA (Brazil, Metals & Mining) 0.9 JD.com, Inc. sponsored ADR (Cayman Islands, Internet & Direct Marketing Retail) 0.8 27.0 Top Market Sectors as of April 30, 2021 % of fund’s net assets Information Technology 20.4 Financials 18.2 Consumer Discretionary 16.0 Communication Services 11.3 Materials 8.5 Consumer Staples 5.7 Energy 4.7 Health Care 4.7 Industrials 3.6 Real Estate 1.7 Geographic Diversification (% of fund’s net assets) As of April 30, 2021 Cayman Islands 23.8% Taiwan 13.7% Korea (South) 13.0% China 10.7% India 9.0% Brazil 4.5% United States of America* 3.9% South Africa 3.5% Saudi Arabia 2.8% Other 15.1% * Includes Short-Term investments and Net Other Assets (Liabilities). Percentages are based on country or territory of incorporation and are adjusted for the effect of futures contracts, if applicable. Asset Allocation as of April 30, 2021 % of fund’s net assets Stocks and Equity Futures 100.0 Semi-Annual Report 4 Fidelity® Emerging Markets Index Fund Schedule of Investments April 30, 2021 (Unaudited) Showing Percentage of Net Assets Common Stocks – 94.5% Shares Value Shares Value Argentina – 0.0% Lojas Renner SA 511,359 $ 3,803,150 Telecom Argentina SA Class B sponsored ADR (a) 60,057 $ 278,064 Magazine Luiza SA 1,879,624 6,930,877 YPF SA Class D sponsored ADR (b) 111,137 420,098 Natura & Co. Holding SA (b) 576,290 5,170,861 Notre Dame Intermedica Participacoes SA 333,218 4,985,342 TOTAL ARGENTINA 698,162 Petrobras Distribuidora SA 485,300 2,011,046 Petroleo Brasileiro SA - Petrobras (ON) 2,399,697 10,204,803 Bailiwick of Jersey – 0.1% Raia Drogasil SA 692,900 3,354,768 Polymetal International PLC 151,697 3,131,262 Rumo SA (b) 833,500 3,068,823 Sul America SA unit 202,549 1,219,683 Bermuda – 0.7% Suzano Papel e Celulose SA (b) 481,217 6,083,370 Alibaba Health Information Technology Ltd. (b) 2,594,000 7,914,493 Telefonica Brasil SA 325,700 2,590,227 Alibaba Pictures Group Ltd. (b) 7,710,000 1,121,599 TIM SA 542,500 1,217,418 Beijing Enterprises Water Group Ltd. 3,360,000 1,284,696 Totvs SA 315,400 1,805,753 Brilliance China Automotive Holdings Ltd. (c) 1,908,000 1,793,106 Ultrapar Participacoes SA 461,400 1,793,090 China Gas Holdings Ltd. 1,674,800 6,047,844 Vale SA 2,378,484 47,735,629 China Resource Gas Group Ltd. 594,000 3,223,211 Via Varejo SA (b) 820,800 1,787,551 China Youzan Ltd. (b) 8,864,000 2,864,232 Weg SA 1,078,864 6,953,365 Cosco Shipping Ports Ltd. 1,192,977 1,002,882 Credicorp Ltd. 4,359 522,208 TOTAL BRAZIL 184,285,327 Credicorp Ltd. (United States) 38,767 4,628,780 GOME Electrical Appliances Holdings Ltd. (a) (b) 7,646,802 1,260,070 British Virgin Islands – 0.0% Hopson Development Holdings Ltd. 422,000 1,659,696 Mail.Ru Group Ltd. unit (b) 73,128 1,637,243 Kunlun Energy Co. Ltd. 2,500,000 2,684,175 Tianhe Chemicals Group Ltd. (c) 376,000 0 Nine Dragons Paper (Holdings) Ltd. 1,047,000 1,439,537 Shenzhen International Holdings Ltd. 714,674 1,190,548 TOTAL BRITISH VIRGIN ISLANDS 1,637,243 TOTAL BERMUDA 38,637,077 Cayman Islands – 23.8% 21Vianet Group, Inc. ADR (b) 54,280 1,514,955 Brazil – 3.4% 3SBio, Inc. (b) (d) 824,000 780,746 Ambev SA 3,027,100 8,325,563 51job, Inc. sponsored ADR (b) 18,493 1,138,244 Atacadao SA 265,600 1,061,999 AAC Technology Holdings, Inc. 477,500 2,650,689 B2W Companhia Global do Varejo (b) 143,887 1,783,208 Abu Dhabi Islamic Bank 912,805 1,200,291 B3 SA - Brasil Bolsa Balcao 1,323,914 12,551,720 Agile Property Holdings Ltd. 740,000 1,160,336 Banco Bradesco SA 1,186,164 4,513,583 Airtac International Group 79,000 3,335,838 Banco do Brasil SA 552,600 3,015,264 AK Medical Holdings Ltd. (d) 266,000 414,354 Banco Inter SA unit 65,500 2,793,853 Alibaba Group Holding Ltd.