The fund is subject to risks, any of which could cause an investor to lose money. The fund’s principal risks include:

Market Risk — Financial markets rise and fall in response to a variety of factors, sometimes rapidly and unpredictably. Markets may be impacted by economic, political, regulatory, and other conditions, including economic sanctions, tariffs, and other government actions. In addition, the occurrence of global events, such as war, terrorism, environmental disasters, natural disasters and epidemics, may also negatively affect the financial markets. As with any investment whose performance is tied to these markets, the value of an investment in the fund will fluctuate, which means that an investor could lose money over short or long periods.

Investment Style Risk — The fund is an index fund. Therefore, the fund follows the securities included in the index during upturns as well as downturns. Because of its indexing strategy, the fund does not take steps to reduce market exposure or to lessen the effects of a declining market. In addition, because of the fund’s expenses, the fund’s performance may be below that of the index. Errors relating to the index may occur from time to time and may not be identified by the index provider for a period of time. In addition, market disruptions could cause delays in the index’s rebalancing schedule. Such errors and/or market disruptions may result in losses for the fund.

Market Capitalization Risk — Securities issued by companies of different market capitalizations tend to go in and out of favor based on market and economic conditions. During a period when securities of a particular market capitalization fall behind other types of investments, the fund’s performance could be impacted.

Mid-Cap Company Risk — Mid-cap companies may be more vulnerable to adverse business or economic events than larger, more established companies and the value of securities issued by these companies may move sharply.

Foreign Investment Risk — The fund’s investments in securities of foreign issuers involve certain risks that may be greater than those associated with investments in securities of U.S. issuers. These include risks of adverse changes in foreign economic, political, regulatory and other conditions; changes in currency exchange rates or exchange control regulations (including limitations on currency movements and exchanges); the imposition of economic

sanctions or other government restrictions; differing accounting, auditing, financial reporting and legal standards and practices; differing securities market structures; and higher transaction costs. These risks may negatively impact the value or liquidity of the fund’s investments and could impair the fund’s ability to meet its investment objective or invest in accordance with its investment strategy. There is a risk that investments in securities denominated in, and/or receiving revenues in, foreign currencies will decline in value relative to the U.S. dollar. Foreign securities also include ADRs, GDRs, and EDRs, which may be less liquid than the underlying shares in their primary trading market, and GDRs, in particular, many of which are issued by companies in emerging markets, may be more volatile.Foreign securities may also include investments in variable interest entities (VIEs) structures, which are created by China-based operating companies in jurisdictions outside of China to obtain indirect financing due to Chinese regulations that prohibit non-Chinese ownership of those companies.To the extent the fund’s investments in a single country or a limited number of countries represent a large percentage of the fund’s assets, the fund’s performance may be adversely affected by the economic, political, regulatory, and social conditions in those countries, and the fund’s price may be more volatile than the price of a fund that is geographically diversified.

Non-Diversification Risk — The fund is non-diversified, which means that it may invest in the securities of relatively few issuers. As a result, a single adverse economic or regulatory occurrence may have a more significant effect on the fund’s investments, and the fund may experience increased volatility.

Thematic Index Methodology Risk — The index uses a proprietary rules-based methodology, including a manual review process, to determine the companies included in the index. Neither the fund nor the investment adviser can offer assurances that the index methodology will provide an accurate assessment of included companies. The index’s proprietary natural language processing algorithm may not identify companies that would otherwise have been included in the index if the publicly available data for those companies had used the key words analyzed by the natural language processing algorithm. Alternatively, the natural language processing algorithm may identify companies that would not otherwise have been included in the index if the publicly available data for those companies had not used the key words analyzed by the natural language processing algorithm. In addition, the index’s manual review process involves manual application by the index provider of one or more factors and business metrics in order to determine a company’s positive exposure to the Theme. There is no assurance that the manual review process will accurately identify companies that have positive exposure to the Theme which may result in the inaccurate inclusion or exclusion of such companies in the index. There is no guarantee that the index will reflect the Theme exposures intended. Further, there is no assurance that the index provider will compile the index accurately, or that the index will be determined, composed, or calculated accurately.

Tracking Error and Correlation Risk — As an index fund, the fund seeks to track the performance of the index, although it may not be successful in doing so. Further, there can be no guarantee that the fund will achieve a high degree of correlation between the fund’s performance and that of its index. The correlation between the performance of the fund and that of its index, positive or negative, is called “tracking error.” Tracking error can be caused by many factors and it may be significant.

Liquidity Risk — The fund may be unable to sell certain securities, such as illiquid securities, readily at a favorable time or price, or the fund may have to sell them at a loss.

Concentration Risk — To the extent that the fund’s or the index’s portfolio is concentrated in the securities of issuers in a particular market, industry, group of industries, sector, country, or asset class, the fund may be adversely affected by the performance of those securities, may be subject to increased price volatility and may be more vulnerable to adverse economic, market, political or regulatory occurrences affecting that market, industry, group of industries, sector, country, or asset class.

Market Trading Risk — Although fund shares are listed on national securities exchanges, there can be no assurance that an active trading market for fund shares will develop or be maintained. If an active market is not maintained, investors may find it difficult to buy or sell fund shares.