Fidelity® International Sustainability Index Fund Semi-Annual Report April 30, 2021 Contents Note to Shareholders 3 Investment Summary 4 Schedule of Investments 6 Financial Statements 37 Notes to Financial 41 Statements Shareholder Expense 48 Example Liquidity Risk 49 Management Program 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. 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 or any index on which such funds or securities are based. The prospectus contains a more detailed description of the limited relationship MSCI has with Fidelity and any related funds. Standard & Poor’s, S&P and S&P 500 are registered service marks of The McGraw-Hill Companies, Inc. and have been licensed for use by Fidelity Distributors Corporation. Other third-party marks appearing herein are the property of their respective owners. All other marks appearing herein are registered or unregistered trademarks or service marks of FMR LLC or an affiliated company. © 2021 FMR LLC. All rights reserved. This report and the financial statements contained herein are submitted for the general information of the shareholders of the Fund. This report is not authorized for distribution to prospective investors in the Fund 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 Fund 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 encourage you to visit our websites, where we offer ongoing updates, commentary, and analysis on the markets and our funds. 3 Semi-Annual Report 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) 3.6 Tencent Holdings Ltd. (Cayman Islands, Interactive Media & Services) 3.2 Alibaba Group Holding Ltd. sponsored ADR (Cayman Islands, Internet & Direct Marketing Retail) 3.1 ASML Holding NV (Netherlands) (Netherlands, Semiconductors & Semiconductor Equipment) 1.9 Roche Holding AG (participation certificate) (Switzerland, Pharmaceuticals) 1.6 Unilever PLC (United Kingdom, Personal Products) 1.1 SAP SE (Germany, Software) 1.0 Meituan Class B (Cayman Islands, Internet & Direct Marketing Retail) 1.0 Shopify, Inc. Class A (Canada, IT Services) 0.9 Siemens AG (Germany, Industrial Conglomerates) 0.9 18.3 Top Market Sectors as of April 30, 2021 % of fund’s net assets Financials 18.4 Consumer Discretionary 13.6 Information Technology 13.2 Industrials 10.9 Health Care 8.4 Materials 8.4 Consumer Staples 7.7 Communication Services 7.6 Energy 3.8 Utilities 3.0 Semi-Annual Report 4 Geographic Diversification (% of fund’s net assets) As of April 30, 2021 Japan 15.0% Cayman Islands 9.2% Canada 7.8% United Kingdom 6.8% Taiwan 6.4% France 6.0% Germany 5.6% Switzerland 5.0% Australia 4.3% Other* 33.9% * 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 99.7 Short-Term Investments and Net Other Assets (Liabilities) 0.3 5 Semi-Annual Report Schedule of Investments April 30, 2021 (Unaudited) Showing Percentage of Net Assets Common Stocks – 95.9% Shares Value Australia – 4.3% APA Group unit 27,327 $ 211,145 ASX Ltd. 4,369 245,626 Aurizon Holdings Ltd. 41,728 120,544 AusNet Services 40,462 59,067 Australia & New Zealand Banking Group Ltd. 64,354 1,424,788 BlueScope Steel Ltd. 11,185 186,286 Brambles Ltd. 33,832 271,050 Coca-Cola Amatil Ltd. 10,398 104,604 Cochlear Ltd. 1,516 259,847 Coles Group Ltd. 30,561 384,216 Commonwealth Bank of Australia 40,225 2,759,112 Computershare Ltd. 12,597 137,022 DEXUS Property Group unit 23,693 185,622 Evolution Mining Ltd. 38,467 137,201 Fortescue Metals Group Ltd. 38,643 672,473 Goodman Group unit 37,995 553,485 Insurance Australia Group Ltd. 54,438 205,488 Lendlease Group unit 15,838 155,072 Macquarie Group Ltd. 7,823 967,185 Mirvac Group unit 91,678 189,979 National Australia Bank Ltd. 74,383 1,527,643 Newcrest Mining Ltd. 18,882 385,753 Northern Star Resources Ltd. 24,336 197,033 Orica Ltd. 9,578 100,051 Ramsay Health Care Ltd. 4,209 218,279 SEEK Ltd. 7,854 187,379 Stockland Corp. Ltd. unit 55,448 199,903 Suncorp Group Ltd. 28,558 231,216 Sydney Airport unit (a) 28,365 135,258 Telstra Corp. Ltd. 95,197 248,606 The GPT Group unit 45,669 162,537 Transurban Group unit 62,513 682,383 Vicinity Centres unit 90,552 110,564 Woodside Petroleum Ltd. 22,130 389,714 TOTAL AUSTRALIA 14,006,131 Austria – 0.2% Erste Group Bank AG 6,289 223,804 See accompanying notes which are an integral part of the financial statements. Semi-Annual Report 6 Common Stocks – continued Shares Value Austria – continued OMV AG 3,220 $ 158,760 Voestalpine AG 2,556 110,934 TOTAL AUSTRIA 493,498 Bailiwick of Jersey – 0.3% Ferguson PLC 5,119 645,595 Polymetal International PLC 5,070 104,653 WPP PLC 28,141 379,400 TOTAL BAILIWICK OF JERSEY 1,129,648 Belgium – 0.4% Colruyt NV 1,400 83,030 KBC Groep NV 5,765 447,879 Solvay SA Class A 1,743 221,706 UCB SA 2,984 276,454 Umicore SA 4,364 265,168 TOTAL BELGIUM 1,294,237 Bermuda – 0.2% Alibaba Health Information Technology Ltd. (a) 90,000 274,597 Beijing Enterprises Water Group Ltd. 96,000 36,706 China Gas Holdings Ltd. 58,600 211,610 China Resource Gas Group Ltd. 22,000 119,378 TOTAL BERMUDA 642,291 Brazil – 0.7% Atacadao SA 8,000 31,988 B2W Companhia Global do Varejo (a) 5,100 63,205 B3 SA - Brasil Bolsa Balcao 47,800 453,181 Banco do Brasil SA 18,300 99,854 Banco Santander SA (Brasil) unit 9,200 65,256 Cosan SA 5,736 95,099 CPFL Energia SA 3,100 16,750 Energisa SA unit 3,800 30,822 Equatorial Energia SA 33,500 154,733 Klabin SA unit (a) 15,600 80,010 Localiza Rent A Car SA 13,300 157,434 Lojas Renner SA 17,430 129,633 See accompanying notes which are an integral part of the financial statements. 7 Semi-Annual Report Schedule of Investments (Unaudited) – continued Common Stocks – continued Shares Value Brazil – continued Natura & Co. Holding SA (a) 21,513 $ 193,029 Notre Dame Intermedica Participacoes SA 11,293 168,957 Telefonica Brasil SA 10,700 85,095 TIM SA 15,100 33,886 Ultrapar Participacoes SA 14,300 55,573 Via Varejo SA (a) 33,800 73,610 Weg SA 37,980 244,784 TOTAL BRAZIL 2,232,899 Canada – 7.6% Agnico Eagle Mines Ltd.