SUMMARY PROSPECTUS

September 27, 2021

Big Data Refiners ETF

As permitted by regulations adopted by the Securities and Exchange Commission, paper copies of a Fund’s annual and semiannual shareholder reports will no longer be sent by mail, unless you specifically request paper copies of the reports. Instead, the reports will be made available on the Trust’s website (www.proshares.com), and you will be notified by mail each time a report is posted and provided with a website link to access the report.

If you already elected to receive shareholder reports electronically, you will not be affected by this change and you need not take any action. You may elect to receive shareholder reports and other communications from the Fund electronically anytime by contacting your financial intermediary (such as your brokerage firm).

You may elect to receive all future reports in paper free of charge. Please contact your financial intermediary to request that you continue to receive paper copies of your shareholder reports. Your election to receive reports in paper will apply to all funds held in your account that you invest in through your financial intermediary.

This Summary Prospectus is designed to provide investors with key fund information in a clear and concise format. Before you invest, you may want to review the Fund’s Full Prospectus, which contains more information about the Fund and its risks. The Fund’s Full Prospectus, dated September 27, 2021, and Statement of Additional Information, dated September 27, 2021, and as each hereafter may be supplemented, are incorporated by reference into this Summary Prospectus. All of this information may be obtained at no cost either: online at ProShares.com/resources/prospectus_reports.html; by calling 866-PRO-5125 (866-776-5125); or by sending an email request to info@ProShares.com. The Securities and Exchange Commission has not approved or disapproved these securities or passed upon the adequacy of this Summary Prospectus. Any representation to the contrary is a criminal offense.

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Big Data Refiners ETF :: 3

Investment Objective

ProShares Big Data Refiners ETF (the “Fund”) seeks investment results, before fees and expenses, that track the performance of the FactSet Big Data Refiners Index (the “Index”).

Fees and Expenses of the Fund

The table below describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Management Fees	0.58%
Other Expenses1	0.00%
Total Annual Fund Operating Expenses	0.58%

“Other Expenses” are estimated.

Example: This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds.

The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of each period. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your approximate costs would be:

1 Year	3 Years
$59	$186

The Fund pays transaction and financing costs associated with the purchase and sale of securities. These costs are not reflected in the table or the example above.

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 the Fund’s shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the example above, affect the Fund’s performance. The Fund has not yet commenced operations as of the date of this Prospectus. Thus, no portfolio turnover information is provided for this Fund.

Principal Investment Strategies

The Fund invests in securities that ProShare Advisors believes, in combination, should track the performance of the Index.

The Index consists of companies that provide analytics and infrastructure for managing and extracting information from large data sets. The Index includes companies whose principal business is the provision of analytics, software, hardware, and other computing infrastructure for managing and extracting information from large structured and unstructured data sets, as determined by the Index methodology. The Index is owned and administered by FactSet Research Systems, Inc. (the “Index Provider”). In order to be included in the Index, a company must be included in at least one of nine FactSet® Revere Business Industry Classification System Sub-Industries (“RBICS Sub-Industries”) that the Index Provider has identified as big data related. The nine eligible RBICS Sub-Industries are:

•Business Intelligence Software

•Business Intelligence/Data Warehousing Consulting

•Customer Service Software

•Data Storage Infrastructure Software

•Enterprise Middleware Software

•Government and Public Service Industry Software

•Information Storage Systems

•Network Administration Software

•Peripheral and Other Commerce Equipment Makers

The Index Provider then selects into the Index companies that generate 75% or more revenue from products or services associated with the eligible RBICS Sub-Industries. If fewer than 25 companies meet this criteria, the Index Provider will reduce the revenue threshold to 50% and select the 25 companies with the highest percentage revenue from those products and services. Selected companies are weighted based on market capitalization, subject to a maximum weight of 4.5% for any single company. Selected companies must be U.S., non-U.S developed, or emerging market companies listed for trading on a stock exchange and meet certain market capitalization and liquidity requirements. The Index is reconstituted and rebalanced semiannually in June and December. The weightings of each security in the Index are allowed to fluctuate between rebalance dates. The Index is published under the Bloomberg ticker symbol “FDSBDFN.”

The Fund will invest principally in the securities set forth below.

•Equity Securities — The Fund invests in common stock issued by public companies.

•Depositary Receipts — The Fund may invest in depositary receipts, which principally include:

○American Depositary Receipts (ADRs), which represent the right to receive securities of foreign issuers deposited in

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a bank or trust company and are an alternative to purchasing the underlying securities in their national markets and currencies

○Global Depositary Receipts (GDRs), which are receipts for shares in a foreign-based corporation traded in capital markets around the world.

ProShare Advisors determines the type, quantity and mix of investment positions that it believes, in combination, the Fund should hold to produce returns consistent with the Fund’s investment objective. The Fund will generally use a “replication strategy” to achieve its investment objective, meaning that it will invest in all of the component securities of the Index in approximately the same proportion as the Index. However, the Fund may also use a “representative sampling” strategy to invest in or gain exposure to only a representative sample of the securities in the Index or to securities not contained in the Index or in financial instruments, with the intent of obtaining exposure with aggregate characteristics similar to those of the Index. In managing the assets of the Fund, ProShare Advisors does not invest the assets of the Fund in securities or financial instruments based on ProShare Advisors’ view of the investment merit of a particular security, instrument, or company, nor does it conduct conventional investment research or analysis or forecast market movement or trends. The Fund seeks to remain fully invested at all times in securities and/or financial instruments that, in combination, provide exposure to the returns of the Index without regard to market conditions, trends or direction.

The Fund will concentrate (i.e., invest in securities that represent 25 percent or more of the value of the Index) or focus (i.e., invest in securities that represent a substantial portion of its value, but less than 25 percent) its investments in a particular industry or group of industries, country or region to approximately the same extent the Index is so concentrated or focused. As of September 21, 2021, the Index was concentrated in the software and services industry group.

Please see “Investment Objectives, Principal Investment Strategies and Related Risks” in the Fund’s Prospectus for additional details.

Principal Risks

You could lose money by investing in the Fund.

The principal risks described below are intended to provide information about the factors likely to have a significant adverse impact on the Fund’s returns and consequently the value of an investment in the Fund. The risks are presented in an order intended to facilitate readability and their order does not imply that the realization of one risk is more likely to occur than another risk or likely to have a greater adverse impact than another risk.

•Big Data Investing Risk — Big data technology is a relatively new form of technology and is subject to risks associated with a developing industry. There is no guarantee that the products or services offered by companies in this business

will be successful. Big data companies may have limited product lines, markets, financial resources or personnel. They are subject to rapid changes in technology, intense competition, loss or impairment of intellectual property rights, short product life cycles, cyclical economic patterns, evolving industry standards, frequent new product introductions, evolving regulation of the Internet and new privacy laws, and potentially rapid product obsolescence. Big data companies typically engage in significant amounts of spending on research and development and mergers and acquisitions which may be costly. Such companies are also susceptible to operational and information security risks including those associated with hardware or software failures, interruptions, or delays in service by third party vendors, and security breaches. Big data companies are also subject to increasing regulatory constraints, particularly with regard to cybersecurity and privacy, which may adversely affect the profitability and value of such companies. These companies may also face increased scrutiny from regulators and legislators considering how consumer data is stored, safeguarded, and used. Big data companies may face regulatory fines and penalties, including potential forced break-ups, that could hinder the ability of the companies to operate on an ongoing basis.

•Unrelated Business Lines Risk – Companies in the Index may have significant business lines that are not big data related. These unrelated business lines may be a larger portion of a company’s current business, in terms of profit or revenue, for example, than the portion represented by the Index theme. Consequently, these unrelated business lines may have a significant impact on the performance of the company, Index and the Fund. In particular, these unrelated business lines may cause the Fund to underperform investments that do not have exposure to unrelated business lines. For example, if an unrelated business line of a company underperforms its big data related business line, it may negatively affect the performance of the company, the Index and the Fund.

•Correlation Risk — A number of factors may affect the Fund’s ability to achieve a high degree of correlation with the Index, and there is no guarantee that the Fund will achieve a high degree of correlation. Failure to achieve a high degree of correlation may prevent the Fund from achieving its investment objective.

Factors that may adversely affect the Fund’s correlation with the Index include fees, expenses, transaction costs, income items, valuation methodology, accounting standards and disruptions or illiquidity in the markets for the financial instruments in which the Fund invests. The Fund may not have investment exposure to all of the securities in the Index, or its weighting of investment exposure to securities may be different from that of the Index. In addition, the Fund may invest in securities not included in the Index. The Fund may take or refrain from taking positions in order to improve tax efficiency, comply with regulatory

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restrictions, or for other reasons, each of which may negatively affect the Fund’s correlation with the Index. The Fund may also be subject to large movements of assets into and out of the Fund, potentially resulting in the Fund being over- or underexposed to the Index and may be impacted by Index reconstitutions and Index rebalancing events. Additionally, the Fund’s underlying investments may trade on markets that may not be open on the same day as the Fund, which may cause a difference between the performance of the Fund and the performance of the Index on such day. Any of these factors could decrease correlation between the performance of the Fund and the Index and may hinder the Fund’s ability to meet its investment objective.

•Equity and Market Risk — Equity markets are volatile, and the value of securities and other instruments correlated with equity markets may fluctuate dramatically from day to day. Equity markets are subject to corporate, political, regulatory, market and economic developments, as well as developments that impact specific economic sectors, industries or segments of the market. Further, stocks in the Index may underperform other equity investments. Volatility in the markets and/or market developments may cause the value of an investment in the Fund to decrease over short or long periods of time.

•Foreign Investments Risk/Emerging Market Risk — Exposure to securities of foreign issuers may provide the Fund with increased risk. Various factors related to foreign investments may negatively impact the Fund’s and the Index’s performance, such as: i) fluctuations in the value of the applicable foreign currency; ii) differences in securities settlement practices; iii) uncertainty associated with evidence of ownership of investments in countries that lack centralized custodial services; iv) possible regulation of, or other limitations on, investments by U.S. investors in foreign investments; v) potentially higher brokerage commissions; vi) the possibility that a foreign government may withhold portions of interest and dividends at the source; vii) taxation of income earned in foreign countries or other foreign taxes imposed; viii) foreign exchange controls, which may include suspension of the ability to transfer currency from a foreign country; ix) less publicly available information about foreign issuers; x) changes in the denomination currency of a foreign investment; and xi) less certain legal systems in which the Fund may encounter difficulties or be unable to pursue legal remedies. Foreign investments also may be more susceptible to political, social, economic and regional factors than may be the case with U.S. securities. In addition, markets for foreign investments are usually less liquid, more volatile and significantly smaller than markets for U.S. securities, which may affect, among other things, the Fund’s ability to purchase or sell foreign investments at appropriate times and prices. Because of differences in settlement times and/or foreign

market holidays, transactions in a foreign market may take place one or more days after the necessary exposure to these investments is determined. Until the transactions are effected, the Fund is exposed to increased foreign currency risk and market risk and, ultimately, increased correlation risk.

Because the Fund’s foreign investment exposure may include issuers domiciled in developing or “emerging market” countries, all the aforementioned factors are heightened and foreign investments risk is higher. Economic, business, political, or social instability may adversely affect the value of emerging market investments more acutely than investments tied to developed foreign countries. Furthermore any of these developments may result in a decline in the value of a country’s currency. Emerging markets are riskier than more developed markets because they may develop unevenly or may never fully develop. Investments in emerging markets are considered speculative.

•Concentration and Focused Investing — The Index may concentrate (i.e., composed of securities that represent 25 percent or more of the value of the Index) or focus (i.e., composed of securities that represent a substantial portion of its value, but less than 25 percent) in an industry or group of industries. The Fund will allocate its investments to approximately the same extent as the Index. As a result, the Fund may be subject to greater market fluctuations than a fund that is more broadly invested across industries. Financial, economic, business, regulatory conditions, and other developments affecting issuers in a particular industry or group of industries will have a greater effect on the Fund, and if securities of the particular industry or group of industries fall out of favor, the Fund could underperform, or its net asset value may be more volatile than, funds that have greater industry diversification.

•Software and Services Industry Risk — The risks of investments in the industry include: competitive pressures, such as aggressive pricing (including fixed-rate pricing), technological developments (including product-specific technological change), changing domestic demand, and the ability to attract and retain skilled employees; availability and price of components; dependence on intellectual property rights, and potential loss or impairment of those rights; research and development costs; rapid product obsolescence; cyclical market patterns; evolving industry standards; and frequent new product introductions requiring timely and successful introduction of new products and the ability to service such products. The software and services industry may also be affected by risks that affect the broader information technology industry.

•Non-Diversification Risk — The Fund is classified as “non-diversified” under the Investment Company Act of 1940, as

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amended (“1940 Act”). This means it has the ability to invest a relatively high percentage of its assets in the securities of a small number of issuers. This may increase the Fund’s volatility and increase the risk that the Fund’s performance will decline based on the performance of a single issuer.

•Index Performance Risk — The Fund is linked to an Index maintained by a third party provider unaffiliated with the Fund or ProShare Advisors. There can be no guarantee or assurance that the methodology used by the third-party provider to identify companies whose business is big data related will achieve its intended result or that investing in big data related companies will result in positive returns. Further, there can be no guarantee that the methodology underlying the Index or the daily calculation of the Index will be free from error. For an Index with exposure to foreign, and especially emerging markets, there may be heightened risks associated with the adequacy and reliability of the information used to calculate the Index, because there might be less, incomplete or inaccurate information available about securities issuers in those markets due to different or less stringent market or accounting regulation or practices. ProShare Advisors has no ability to assess a third party provider’s due diligence process over index data prior to its use in index computation, construction and/or rebalancing. It is also possible that the value of the Index may be subject to intentional manipulation by third-party market participants. The Index used by the Fund may underperform other asset classes and may underperform other similar indices. Each of these factors could have a negative impact on the performance of the Fund.

•Market Price Variance Risk — Investors buy and sell Fund shares in the secondary market at market prices, which may be different from the NAV per share of the Fund (i.e., the secondary market price may trade at a price greater than NAV (a premium) or less than NAV (a discount)). The market price of the Fund’s shares will fluctuate in response to changes in the value of the Fund’s holdings, supply and demand for shares and other market factors. In addition, the instruments held by the Fund may be traded in markets on days and at times when the Fund’s listing exchange is closed for trading. As a result, the value of the Fund’s holdings may vary, perhaps significantly, on days and at times when investors are unable to purchase or sell Fund shares. ProShare Advisors cannot predict whether shares will trade above, below or at a price equal to the value of the Fund’s holdings.

•Early Close/Late Close/Trading Halt Risk — An exchange or market may close early, close late or issue trading halts on specific securities or financial instruments. As a result, the ability to trade certain securities or financial instruments may be restricted, which may disrupt the Fund’s creation and redemption process, potentially affect the price at which the Fund’s shares trade in the secondary market, and/or result in the Fund being unable to trade certain securities

or financial instruments at all. In these circumstances, the Fund may be unable to rebalance its portfolio, may be unable to accurately price its investments and/or may incur substantial trading losses. If trading in the Fund’s shares are halted, investors may be temporarily unable to trade shares of the Fund.

•Liquidity Risk — In certain circumstances, such as the disruption of the orderly markets for the financial instruments in which the Fund invests, the Fund might not be able to acquire or dispose of certain holdings quickly or at prices that represent true market value in the judgment of ProShare Advisors. Markets for the financial instruments in which the Fund invests may be disrupted by a number of events, including but not limited to economic crises, political crises, health crises, natural disasters, excessive volatility, new legislation, or regulatory changes inside or outside of the U.S. For example, regulation limiting the ability of certain financial institutions to invest in certain financial instruments would likely reduce the liquidity of those instruments. These situations may prevent the Fund from limiting losses, realizing gains or achieving a high correlation with the Index.

•New Fund Risk — The Fund recently commenced operations, has a limited operating history, and started operations with a small asset base. There can be no assurance that the Fund will be successful or grow to or maintain a viable size, that an active trading market for the Fund’s shares will develop or be maintained, or that the Fund’s shares’ listing will continue unchanged.

•Portfolio Turnover Risk — The Fund may incur high portfolio turnover to manage the Fund’s investment exposure. Additionally, active market trading of the Fund’s shares may cause more frequent creation or redemption activities that could, in certain circumstances, increase the number of portfolio transactions. High levels of portfolio transactions increase brokerage and other transaction costs and may result in increased taxable capital gains. Each of these factors could have a negative impact on the performance of the Fund.

•Tax Risk — In order to qualify for the special tax treatment accorded a regulated investment company (“RIC”) and its shareholders, the Fund must derive at least 90% of its gross income for each taxable year from “qualifying income,” meet certain asset diversification tests at the end of each taxable quarter, and meet annual distribution requirements. The Fund’s pursuit of its investment strategies will potentially be limited by the Fund’s intention to qualify for such treatment and could adversely affect the Fund’s ability to so qualify. The Fund can make certain investments, the treatment of which for these purposes is unclear. If, in any year, the Fund were to fail to qualify for the special tax treatment accorded a RIC and its shareholders, and were ineligible to or were not to cure such failure, the Fund would be taxed in the same manner as an ordinary

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corporation subject to U.S. federal income tax on all its income at the fund level. The resulting taxes could substantially reduce the Fund’s net assets and the amount of income available for distribution. In addition, in order to requalify for taxation as a RIC, the Fund could be required to recognize unrealized gains, pay substantial taxes and interest, and make certain distributions. Please see the Statement of Additional Information for more information.

•Valuation Risk — In certain circumstances (e.g., if ProShare Advisors believes market quotations do not accurately reflect the fair value of an investment, or a trading halt closes an exchange or market early), ProShare Advisors may, pursuant to procedures established by the Board of Trustees of the Fund, choose to determine a fair value price as the basis for determining the market value of such investment for such day. The fair value of an investment determined by ProShare Advisors may be different from other value determinations of the same investment. Portfolio investments that are valued using techniques other than market quotations, including “fair valued” investments, may be subject to greater fluctuation in their value from one day to the next than would be the case if market quotations were used. In addition, there is no assurance that the Fund could sell a portfolio investment for the value established for it at any time, and it is possible that the Fund would incur a loss because a portfolio investment is sold at a discount to its established value.

Please see “Investment Objectives, Principal Investment Strategies and Related Risks” in the Fund’s Prospectus for additional details.

Investment Results

Performance history will be available for the Fund after it has been in operation for a full calendar year. After the Fund has a full calendar year of performance information, performance information will be shown on an annual basis.

Management

The Fund is advised by ProShare Advisors. Alexander Ilyasov, Senior Portfolio Manager, and Scott Hanson, Portfolio Manager, have jointly and primarily managed the Fund since September 2021.

Purchase and Sale of Fund Shares

The Fund will issue and redeem shares only to Authorized Participants (typically broker-dealers) in exchange for the deposit or delivery of a basket of assets (securities and/or cash) in large blocks, known as Creation Units. Shares of the Fund may only be purchased and sold by retail investors in secondary market transactions through broker-dealers or other financial intermediaries. Shares of the Fund are listed for trading on a national securities exchange and because shares trade at market prices rather than NAV, shares of the Fund may trade at a price greater than NAV (premium) or less than NAV (discount). In addition to brokerage commissions, investors incur the costs of the difference between the highest price a buyer is willing to pay to purchase shares of the Funds (bid) and the lowest price a seller is willing to accept for shares of the Fund (ask) when buying or selling shares in the secondary market (the “bid-ask spread”). The bid-ask spread varies over time for Fund shares based on trading volume and market liquidity. Recent information, including information about a Fund’s NAV, market price, premiums and discounts, and bid-ask spreads, is included on the Fund’s website (www.proshares.com).

Tax Information

Income and capital gains distributions you receive from the Fund generally are subject to federal income taxes and may also be subject to state and local taxes. The Fund intends to distribute income, if any, quarterly, and capital gains, if any, at least annually.

Investment Company Act file number 811-21114

ProShares Trust
7272 Wisconsin Avenue, 21st Floor, Bethesda, MD 20814
866.PRO.5125 866.776.5125
ProShares.com