· Power ecosystem company risk: Because the fund invests significantly in power ecosystem companies, the fund is more susceptible to adverse economic, regulatory, political, legal and other developments affecting such companies. Power ecosystem companies may experience substantial price volatility, carry relatively high levels of debt and be more likely than other companies to restructure their businesses and/or become unable to maintain capital construction programs during downturns in energy markets, broader economic slowdowns, or periods of high inflation and rising interest rates. These companies are also subject to specific risks, including, among others, fluctuations in commodity prices and interest rates; changes in energy-related and environmental regulations (including energy conservation policies); government rate-setting standards (e.g., fixed rates charged to customers); changes in subsidy levels, tax laws, tariffs, and accounting standards; domestic and international political, regulatory, and economic conditions (especially in key energy‑producing and consuming countries); service interruptions or legal challenges arising from environmental, operational, or other incidents; constraints on the availability or cost of necessary resources; and shifts in market sentiment toward power ecosystem companies. Power ecosystem companies also face operating risks, including the risk of fire, explosions, leaks, mining and drilling accidents and other catastrophic events. In addition, natural disasters—such as earthquakes, floods, lightning, hurricanes, tsunamis, and severe wind—are inherent risks in these operations. At times, securities of power ecosystem companies may underperform other industries or the broader market.

· Risks of stock investing: Stocks generally fluctuate more in value than bonds and may decline significantly over short time periods. There is the chance that stock prices overall will decline because stock markets tend to move in cycles, with periods of rising prices and falling prices. The market value of a stock may decline due to general market conditions or because of factors that affect the particular company or the company's industry. Holders of common stock incur more risk than holders of preferred stock and debt obligations because common stockholders, as owners of the issuer, generally have inferior rights to receive payments from the issuer in comparison with the rights of holders of debt obligations or preferred stock issued by the issuer.  In addition, holders of common stock generally have a lower priority in reorganization and bankruptcy proceedings than holders of debt obligations or preferred stock.

· Foreign investment risk: Because the fund invests in foreign securities, the fund's performance will be influenced by political, social and economic factors affecting investments in foreign issuers. Special risks associated with investments in foreign issuers include exposure to currency fluctuations, less liquidity, less developed or less efficient trading markets, lack of comprehensive company information, political and economic instability and differing auditing and legal standards. The imposition of sanctions, confiscations, trade restrictions (including tariffs) and other government restrictions by the United States and other governments, or problems related to share registration, trade settlement, or asset custody, may result in losses for the fund. Investments denominated in foreign currencies are subject to the risk that such currencies will decline in value relative to the U.S. dollar and affect the value of these investments held by the fund. To the extent securities held by the fund trade in a market that is closed when the exchange on which the fund's shares trade is open, there may be deviations between the current price of a security and the last quoted price for the security in the closed foreign market. These deviations could result in the fund experiencing premiums or discounts greater than those of ETFs that invest in domestic securities. To the extent the fund's investments are focused in a limited number of foreign countries, the fund's performance could be more volatile than that of more geographically diversified funds.

· Emerging market risk: The securities of issuers located or doing substantial business in emerging market countries tend to be more volatile and less liquid than the securities of issuers located in countries with more mature economies. There may be less information publicly available about an emerging market issuer than about a developed market issuer and/or the available information may be outdated or unreliable. In addition, emerging market issuers may not be subject to accounting, auditing, legal and financial reporting standards comparable to those in developed markets, potentially making it difficult to evaluate such issuers. Emerging markets generally have less diverse and less mature economic structures and less stable political systems than those of developed countries. Additionally, investments in these countries may have restrictions that make it difficult or impossible for the fund to exercise rights, pursue legal remedies, and obtain judgements in foreign courts. Investments in these countries may be subject to political, economic, legal, market and currency risks. The risks may include less protection of property rights and uncertain political and economic policies, greater vulnerability to market manipulation, the imposition of capital controls and/or foreign investment limitations by a country, nationalization of businesses and the imposition of sanctions by other countries, such as the United States.

· Market risk: The value of the securities in which the fund invests may be affected by political, regulatory, economic and social developments, and developments that impact specific economic sectors, industries or segments of the market. In addition, turbulence in financial markets and reduced liquidity in equity, credit and/or fixed-income markets may negatively affect many issuers, which could adversely affect the fund. Global economies and financial

markets are becoming increasingly interconnected, and conditions and events in one country, region or financial market may adversely impact issuers in a different country, region or financial market. These risks may be magnified if certain events or developments adversely interrupt the global supply chain; in these and other circumstances, such risks might affect companies world-wide. Local, regional or global events such as war, military conflicts, acts of terrorism, natural disaster, the spread of infectious illness and other public health issues, or other events could have a significant impact on the fund and its investments.

· Authorized participants, market makers and liquidity providers risk: The fund has a limited number of financial institutions that may act as Authorized Participants, which are responsible for the creation and redemption activity for the fund. In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent either of the following events occur, fund shares may trade at a material discount to net asset value and possibly face delisting: (i) Authorized Participants exit the business or otherwise become unable or unwilling to process creation and/or redemption orders and no other Authorized Participants step forward to perform these services, or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions.

· Trading issues risk: Although fund shares are listed for trading on an exchange and may be listed or traded on other U.S. and non-U.S. stock exchanges as well, there can be no assurance that an active trading market for such fund shares will develop or be maintained. Trading in fund shares may be halted due to market conditions or for reasons that, in the view of the listing exchange, make trading in fund shares inadvisable. In addition, trading in fund shares on an exchange is subject to trading halts caused by extraordinary market volatility pursuant to exchange "circuit breaker" rules. There can be no assurance that the requirements of the listing exchange necessary to maintain the listing of the fund will continue to be met or will remain unchanged or that fund shares will trade with any volume, or at all, on any stock exchange.

· Non-diversification risk: The fund is non-diversified and therefore, the fund's performance may be more vulnerable to changes in the market value of a single issuer or group of issuers and more susceptible to risks associated with a single economic, political or regulatory occurrence than a diversified fund.