485BPOS

As filed with the Securities and Exchange Commission on July 30, 2018

Registration Nos. 333-89822; 811-21114

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form N-1A

REGISTRATION STATEMENT

UNDER

THE SECURITIES ACT OF 1933	☒
Pre-Effective Amendment No.
Post-Effective Amendment No. 200	☒

and/or

REGISTRATION STATEMENT

UNDER

THE INVESTMENT COMPANY ACT OF 1940	☒
Amendment No. 209	☒

ProShares Trust

(Exact name of Registrant as Specified in Trust Instrument)

7501 Wisconsin Avenue,

Suite 1000E

Bethesda, MD 20814

(Address of Principal Executive Office) (Zip Code)

(240) 497-6400

(Area Code and Telephone Number)

Michael L. Sapir, CEO

ProShare Advisors LLC

7501 Wisconsin Avenue, Suite 1000E

Bethesda, MD 20814

(Name and Address of Agent for Service)

with copies to:

John Loder, Esq. Ropes & Gray LLP Prudential Tower 800 Boylston Street Boston, MA 02199-3600 Richard F. Morris, Esq. ProShare Advisors LLC 7501 Wisconsin Avenue Suite 1000E Bethesda, MD 20814

Approximate date of Proposed Public Offering:

It is proposed that this filing will become effective:

☒ immediately upon filing pursuant to paragraph (b)

☐ 60 days after filing pursuant to paragraph (a)(1)

☐ on             pursuant to paragraph (a)(1)

☐ 75 days after filing pursuant to paragraph (a)(2)

☐ on (date) pursuant to paragraph (a)(2) of rule 485.

If appropriate, check the following:

☐ This post-effective amendment designates a new effective date for a previously filed post-effective amendment.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933 and the Investment Company Act of 1940, the Registrant has duly caused this post-effective amendment (the “Amendment”) to its Registration Statement to be signed on its behalf by the undersigned, thereto duly authorized, in the City of Bethesda and the State of Maryland on July 30, 2018.

ProShares Trust
By:	/s/ Todd B. Johnson
	Todd B. Johnson President

Pursuant to the requirements of the Securities Act of 1933, this Amendment to the Registration Statement has been signed below by the following persons in the capacities indicated.

Signature	Title	Date
/s/ Michael L. Sapir* Michael L. Sapir	Trustee, Chairman	July 30, 2018
/s/ Russell S. Reynolds, III* Russell S. Reynolds, III	Trustee	July 30, 2018
/s/ Michael C. Wachs* Michael C. Wachs	Trustee	July 30, 2018
/s/ William D. Fertig* William D. Fertig	Trustee	July 30, 2018
/s/ Todd B. Johnson Todd B. Johnson	President	July 30, 2018
/s/ Troy A. Sheets Troy A. Sheets	Treasurer	July 30, 2018

* By:	/s/ Richard F. Morris
	Richard F. Morris
	As Attorney-in-fact

Date: July 30, 2018

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Document Type	dei_DocumentType	485BPOS
Document Period End Date	dei_DocumentPeriodEndDate	Jul. 09, 2018
Registrant Name	dei_EntityRegistrantName	PROSHARES TRUST
Central Index Key	dei_EntityCentralIndexKey	0001174610
Amendment Flag	dei_AmendmentFlag	false
Document Creation Date	dei_DocumentCreationDate	Jul. 09, 2018
Document Effective Date	dei_DocumentEffectiveDate	Jul. 09, 2018
Prospectus Date	rr_ProspectusDate	Jul. 09, 2018

XML

ProShares Online Retail ETF

ONLINE RETAIL ETF

Investment Objective

ProShares Online Retail ETF (the “Fund”) seeks investment results, before fees and expenses, that track the performance of the ProShares Online Retail Index (the “Index”).

Fees and Expenses of the Fund

The table below describes the fees and expenses that you may pay if you buy or hold shares of the Fund.

Annual Fund Operating Expenses

(expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses	ProShares Online Retail ETF ProShares Online Retail ETF
Management Fees	0.58%
Other Expenses	none	[1]
Total Annual Fund Operating Expenses	0.58%

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 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:

Expense Example	1 Year	3 Years
ProShares Online Retail ETF | ProShares Online Retail ETF | USD ($)	59	186

The Fund pays transaction and financing costs associated with the purchase and sale of securities and derivatives. In addition, investors may pay brokerage commissions on their purchases and sales of the Fund’s shares. 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 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 seeks to invest substantially all of its assets in the stocks that make up the Index and generally holds each stock in approximately the same proportion as its weighting in the Index.

The Index is designed to measure the performance of publicly traded companies that principally sell online or through other non-store sales channels, such as through mobile or app purchases, rather than through "brick and mortar" store locations ("Online Retailers"). The Index includes U.S. and non-U.S. companies. To be included in the Index, an online retailer's securities must be listed on a U.S. stock exchange, must have a minimum market capitalization of $500 million and must meet certain liquidity requirements. Non-U.S. companies may not make up more than 25% of the Index. Companies are weighted in the Index using a modified market capitalization approach.

ProShare Advisors LLC (“ProShare Advisors”) believes that investing in Online Retailers is attractive because online sales have been rapidly rising and ProShare Advisors believes this trend will continue.

The Fund invests in securities that ProShare Advisors believes will enable the Fund, before fees and expenses, to track the performance of the Index. Under normal circumstances, the Fund will invest at least 80% of its assets in the component securities of the Index.

• 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 a bank or trust company.

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

ProShare Advisors follows a passive approach to investing that is designed to track the performance of the Index. 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 or instrument, nor does it conduct conventional investment research or analysis or forecast market movement or trends, in managing the assets of the Fund. The Fund seeks to remain fully invested at all times in securities that, provide exposure to the Index without regard to market conditions, trends or direction.

The Fund will concentrate its investments in a particular industry or group of industries, country or region to approximately the same extent as the Index is so concentrated. As of May 31, 2018, the Index was concentrated in the Information Technology and Retailing industry groups.

The Index is created and sponsored by ProShare Advisors and is licensed for use by ProShares Trust (the “Trust”). Please see “Investment Objectives, Principal Investment Strategies and Related Risks” in the back of the Fund’s Full Prospectus for additional details.

Principal Risks

You could lose money by investing in 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 securities or financial instruments in which the Fund invests. The Fund may not have investment exposure to all 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 or in financial instruments. The Fund may take or refrain from taking positions in order to improve tax efficiency, comply with regulatory 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 changes in the daily performance of the Fund and changes in the level of the Index. 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.

• Early Close/Late Close/Trading Halt Risk — An exchange or market may close early, close late or issue trading halts on specific securities, or the ability to buy or sell certain securities or financial instruments may be restricted, which may result in the Fund being unable to buy or sell certain securities or financial instruments. 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.

• Equity and Market Risk — The equity markets are volatile, and the value of securities, swaps and other instruments correlated with the 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.

• Foreign Investments Risk/Emerging Market Risk — Investments in securities of foreign issuers may provide the Fund with increased risk. Various factors related to foreign investments may negatively impact the Fund's and 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 might encounter difficulties or be unable to pursue legal remedies. Foreign investments also may be more susceptible to political, social, economic and regional factors than might 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. 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 investments will 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 securities more acutely than securities 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.

• Self-Indexing Performance Risk — The Fund is linked to an Index sponsored by ProShare Advisors. There can be no guarantee or assurance that the methodology used to create the Index will result in the Fund achieving high, or even 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. It is also possible that third parties may attempt to manipulate the value of the Index or its underlying securities. The Index may underperform other asset classes and may underperform other indices or benchmarks based upon the same underlying securities. Each of these factors could have a negative impact on the performance of the Fund.

• Information Technology Industry Risk — The Fund is subject to risks faced by companies in the information technology industry to the same extent as the Index is so concentrated. Securities of information technology companies may be subject to greater volatility than stocks of companies in other market sectors. Like other technology companies, information technology companies may be affected by intense competition, obsolescence of existing technology, general economic conditions and government regulation and may have limited product lines, markets, financial resources or personnel. Information technology companies may experience dramatic and often unpredictable changes in growth rates and competition for qualified personnel. These companies also are heavily dependent on patent and intellectual property rights, the loss or impairment of which may adversely affect profitability. A small number of companies represent a large portion of the information technology industry as a whole. The information technology industry may also be affected by risks that affect the telecommunications industry, including a telecommunications market characterized by increasing competition and regulation by the Federal Communications Commission and various state regulatory authorities; the need to commit substantial capital to meet increasing competition, particularly in formulating new products and services using new technology; and technological innovations that may make various products and services obsolete.

• Internet Companies Risk — Internet companies are subject to rapid changes in technology, worldwide competition, rapid obsolescence of products and services, loss of patent protections, cyclical market patterns, evolving industry standards, frequent new product introductions and the considerable risk of owning small capitalization companies that have recently begun operations. In addition, the stocks of many internet companies have exceptionally high price-to-earnings ratios with little or no earnings histories. Many internet companies have experienced extreme price and volume fluctuations that often have been unrelated to their operating performance.

• Large-Cap Company Investment Risk — The Index and, by extension, the Fund are exposed to stocks of large-cap companies. Although returns on investments in large-cap companies are often perceived as being less volatile than the returns of companies with smaller market capitalizations, the return on large-cap securities could trail the returns on investments in smaller and mid-sized companies for a number of reasons. For example, large-cap companies may be unable to respond quickly to new competitive challenges, such as changes in technology, and also may not be able to attain the high growth rate of successful smaller companies.

• Liquidity Risk — In certain circumstances, such as the disruption of the orderly markets for the securities or 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 securities or financial instruments in which the Fund invests may be disrupted by a number of events, including but not limited to economic crises, natural disasters, 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 securities would likely reduce the liquidity of those securities. These situations may prevent the Fund from limiting losses, realizing gains or achieving a high correlation with the Index.

• Market Price Variance Risk — Fund shares are listed for trading on the Exchange and can be bought and sold in the secondary market at market prices. The market price of shares will fluctuate in response to changes in the value of the Fund’s holdings, supply and demand for shares and other market factors. ProShare Advisors cannot predict whether shares will trade above, below or at a price equal to the value of the Fund’s holdings. Given the fact that shares can be created and redeemed in Creation Units, as defined below, ProShare Advisors believes that large discounts or premiums to the value of the Fund’s holdings should not be sustained. The Fund’s investment results are measured based upon the daily NAV of the Fund. Investors purchasing and selling shares in the secondary market may not experience investment results consistent with those experienced by Authorized Participants creating and redeeming directly with the Fund.

• 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.

• Non-Diversification Risk — The Fund is classified as "non-diversified" under the Investment Company Act of 1940 ("1940 Act"), and has the ability to invest a relatively high percentage of its assets in the securities of a small number of issuers susceptible to a single economic, political or regulatory event, or in financial instruments with a single counterparty or a few counterparties. This may increase the Fund's volatility and cause performance of a relatively smaller number of issuers or the credit of one or a relatively smaller number of counterparties to have a greater impact on the Fund's performance. Notwithstanding the Fund's status as a "non-diversified" investment company under the 1940 Act, the Fund intends to qualify as a "regulated investment company" ("RIC") accorded special tax treatment under the Internal Revenue Code, which imposes its own diversification requirements that are less restrictive than the requirements applicable to "diversified" investment companies under the 1940 Act.

• Online Retail Companies Risk — Companies that operate in the online marketplace and retail segments are subject to fluctuating consumer demand. Unlike traditional brick and mortar retailers, online marketplaces and retailers must assume shipping costs or pass such costs to consumers. Consumer access to price information for the same or similar products may cause companies that operate in the online marketplace and retail segments to reduce profit margins in order to compete. Due to the nature of their business models, companies that operate in the online marketplace and retail segments may also be subject to heightened cybersecurity risk, including the risk of theft or damage to vital hardware, software and information systems. The loss or public dissemination of sensitive customer information or other proprietary data may negatively affect the financial performance of such companies to a greater extent than traditional brick and mortar retailers. As a result of such companies being web-based and the fact that they process, store, and transmit large amounts of data, including personal information, for their customers, failure to prevent or mitigate data loss or other security breaches, including breaches of vendors’ technology and systems, could expose companies that operate in the online marketplace and retail segments or their customers to a risk of loss or misuse of such information, adversely affect their operating results, result in litigation or potential liability, and otherwise harm their businesses. Though ProShare Advisors believes that investing in Online Retailers is attractive because online sales have been rapidly rising, there is no guarantee that this trend will continue. Each of these factors could have a negative impact on the performance of the companies in the Index and the performance of the Fund.

• Portfolio Turnover Risk — In seeking to meet its investment objective, 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 transactions increase brokerage and other transaction costs and may result in increased taxable capital gains.

• Retailing Industry Risk — The Fund is subject to the risks faced by companies in the retailing industry to the same extent as the Index is so concentrated, including: changes in domestic and international economies, consumer confidence, disposable household income and spending, and consumer tastes and preferences; intense competition; changing demographics; marketing and public perception; dependence on third-party suppliers and distribution systems; intellectual property infringement; legislative or regulatory changes and increased government supervision; thin capitalization; dependence on a relatively few number of high volume sales days to achieve overall results; and dependence on outside financing, which may be difficult to obtain. The retailing industry may also be affected by risks that affect the broader consumer discretionary industry.

• Small-and Mid-Cap Company Investment Risk — The Index and, by extension, the Fund are exposed to stocks of small-and mid-cap companies. The risk of equity investing may be particularly acute for securities of issuers with smaller market capitalizations. Small- and mid-cap companies may have limited product lines or resources, may be dependent upon a particular market niche and may have greater fluctuations in price than the stocks of larger companies. Small- and mid-cap companies may lack the financial and personnel resources to handle economic or industry-wide setbacks and, as a result, such setbacks could have a greater effect on small- and mid-cap security prices. Additionally, small- and mid-cap company stocks may trade at greater spreads or lower trading volumes, and may be less liquid than the stocks of larger companies. Further, stocks of small- and mid-sized companies could be more difficult to liquidate during market downturns compared to larger, more widely traded companies.

• Software and Services Industry Risk — The Fund is subject to the risks faced by companies in the software and services industry to the same extent as the Index is so concentrated, including: 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.

• Tax Risk — In order to qualify for the special tax treatment accorded a 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 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, portfolio securities may be valued using techniques other than market quotations. The value established for a portfolio security may be different from what would be produced through the use of another methodology or if it had been priced using market quotations. Portfolio securities that are valued using techniques other than market quotations, including “fair valued” securities, 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 a Fund could sell a portfolio security for the value established for it at any time, and it is possible that the Fund would incur a loss because a portfolio security is sold at a discount to its established value.

Please see “Investment Objectives, Principal Investment Strategies and Related Risks” in the back of the Fund’s Full 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.

[1] “Other Expenses” are based on estimated amounts for the current fiscal year.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	PROSHARES TRUST
Prospectus Date	rr_ProspectusDate	Jul. 09, 2018
ProShares Online Retail ETF
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	ONLINE RETAIL ETF
Objective [Heading]	rr_ObjectiveHeading	Investment Objective
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	ProShares Online Retail ETF (the “Fund”) seeks investment results, before fees and expenses, that track the performance of the ProShares Online Retail Index (the “Index”).
Expense [Heading]	rr_ExpenseHeading	Fees and Expenses of the Fund
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	The table below describes the fees and expenses that you may pay if you buy or hold shares of the Fund.
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	Portfolio Turnover
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover 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.
Expense Exchange Traded Fund Commissions [Text]	rr_ExpenseExchangeTradedFundCommissions	In addition, investors may pay brokerage commissions on their purchases and sales of the Fund’s shares. These costs are not reflected in the table or the example above.
Other Expenses, New Fund, Based on Estimates [Text]	rr_OtherExpensesNewFundBasedOnEstimates	“Other Expenses” are based on estimated amounts for the current fiscal year.
Expense Example [Heading]	rr_ExpenseExampleHeading	Example:
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	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 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:
Expense Example Closing [Text Block]	rr_ExpenseExampleClosingTextBlock	The Fund pays transaction and financing costs associated with the purchase and sale of securities and derivatives. In addition, investors may pay brokerage commissions on their purchases and sales of the Fund’s shares. These costs are not reflected in the table or the example above.
Strategy [Heading]	rr_StrategyHeading	Principal Investment Strategies
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	The Fund seeks to invest substantially all of its assets in the stocks that make up the Index and generally holds each stock in approximately the same proportion as its weighting in the Index. The Index is designed to measure the performance of publicly traded companies that principally sell online or through other non-store sales channels, such as through mobile or app purchases, rather than through "brick and mortar" store locations ("Online Retailers"). The Index includes U.S. and non-U.S. companies. To be included in the Index, an online retailer's securities must be listed on a U.S. stock exchange, must have a minimum market capitalization of $500 million and must meet certain liquidity requirements. Non-U.S. companies may not make up more than 25% of the Index. Companies are weighted in the Index using a modified market capitalization approach. ProShare Advisors LLC (“ProShare Advisors”) believes that investing in Online Retailers is attractive because online sales have been rapidly rising and ProShare Advisors believes this trend will continue. The Fund invests in securities that ProShare Advisors believes will enable the Fund, before fees and expenses, to track the performance of the Index. Under normal circumstances, the Fund will invest at least 80% of its assets in the component securities of the Index. 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 a bank or trust company. Global Depositary Receipts (GDRs), which are receipts for shares in a foreign-based corporation traded in capital markets around the world. ProShare Advisors follows a passive approach to investing that is designed to track the performance of the Index. 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 or instrument, nor does it conduct conventional investment research or analysis or forecast market movement or trends, in managing the assets of the Fund. The Fund seeks to remain fully invested at all times in securities that, provide exposure to the Index without regard to market conditions, trends or direction. The Fund will concentrate its investments in a particular industry or group of industries, country or region to approximately the same extent as the Index is so concentrated. As of May 31, 2018, the Index was concentrated in the Information Technology and Retailing industry groups. The Index is created and sponsored by ProShare Advisors and is licensed for use by ProShares Trust (the “Trust”). Please see “Investment Objectives, Principal Investment Strategies and Related Risks” in the back of the Fund’s Full Prospectus for additional details.
Strategy Portfolio Concentration [Text]	rr_StrategyPortfolioConcentration	The Fund will concentrate its investments in a particular industry or group of industries, country or region to approximately the same extent as the Index is so concentrated. As of May 31, 2018, the Index was concentrated in the Information Technology and Retailing industry groups.
Risk [Heading]	rr_RiskHeading	Principal Risks
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	You could lose money by investing in 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 securities or financial instruments in which the Fund invests. The Fund may not have investment exposure to all 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 or in financial instruments. The Fund may take or refrain from taking positions in order to improve tax efficiency, comply with regulatory 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 changes in the daily performance of the Fund and changes in the level of the Index. 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. Early Close/Late Close/Trading Halt Risk — An exchange or market may close early, close late or issue trading halts on specific securities, or the ability to buy or sell certain securities or financial instruments may be restricted, which may result in the Fund being unable to buy or sell certain securities or financial instruments. 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. Equity and Market Risk — The equity markets are volatile, and the value of securities, swaps and other instruments correlated with the 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. Foreign Investments Risk/Emerging Market Risk — Investments in securities of foreign issuers may provide the Fund with increased risk. Various factors related to foreign investments may negatively impact the Fund's and 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 might encounter difficulties or be unable to pursue legal remedies. Foreign investments also may be more susceptible to political, social, economic and regional factors than might 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. 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 investments will 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 securities more acutely than securities 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. Self-Indexing Performance Risk — The Fund is linked to an Index sponsored by ProShare Advisors. There can be no guarantee or assurance that the methodology used to create the Index will result in the Fund achieving high, or even 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. It is also possible that third parties may attempt to manipulate the value of the Index or its underlying securities. The Index may underperform other asset classes and may underperform other indices or benchmarks based upon the same underlying securities. Each of these factors could have a negative impact on the performance of the Fund. Information Technology Industry Risk — The Fund is subject to risks faced by companies in the information technology industry to the same extent as the Index is so concentrated. Securities of information technology companies may be subject to greater volatility than stocks of companies in other market sectors. Like other technology companies, information technology companies may be affected by intense competition, obsolescence of existing technology, general economic conditions and government regulation and may have limited product lines, markets, financial resources or personnel. Information technology companies may experience dramatic and often unpredictable changes in growth rates and competition for qualified personnel. These companies also are heavily dependent on patent and intellectual property rights, the loss or impairment of which may adversely affect profitability. A small number of companies represent a large portion of the information technology industry as a whole. The information technology industry may also be affected by risks that affect the telecommunications industry, including a telecommunications market characterized by increasing competition and regulation by the Federal Communications Commission and various state regulatory authorities; the need to commit substantial capital to meet increasing competition, particularly in formulating new products and services using new technology; and technological innovations that may make various products and services obsolete. Internet Companies Risk — Internet companies are subject to rapid changes in technology, worldwide competition, rapid obsolescence of products and services, loss of patent protections, cyclical market patterns, evolving industry standards, frequent new product introductions and the considerable risk of owning small capitalization companies that have recently begun operations. In addition, the stocks of many internet companies have exceptionally high price-to-earnings ratios with little or no earnings histories. Many internet companies have experienced extreme price and volume fluctuations that often have been unrelated to their operating performance. Large-Cap Company Investment Risk — The Index and, by extension, the Fund are exposed to stocks of large-cap companies. Although returns on investments in large-cap companies are often perceived as being less volatile than the returns of companies with smaller market capitalizations, the return on large-cap securities could trail the returns on investments in smaller and mid-sized companies for a number of reasons. For example, large-cap companies may be unable to respond quickly to new competitive challenges, such as changes in technology, and also may not be able to attain the high growth rate of successful smaller companies. Liquidity Risk — In certain circumstances, such as the disruption of the orderly markets for the securities or 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 securities or financial instruments in which the Fund invests may be disrupted by a number of events, including but not limited to economic crises, natural disasters, 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 securities would likely reduce the liquidity of those securities. These situations may prevent the Fund from limiting losses, realizing gains or achieving a high correlation with the Index. Market Price Variance Risk — Fund shares are listed for trading on the Exchange and can be bought and sold in the secondary market at market prices. The market price of shares will fluctuate in response to changes in the value of the Fund’s holdings, supply and demand for shares and other market factors. ProShare Advisors cannot predict whether shares will trade above, below or at a price equal to the value of the Fund’s holdings. Given the fact that shares can be created and redeemed in Creation Units, as defined below, ProShare Advisors believes that large discounts or premiums to the value of the Fund’s holdings should not be sustained. The Fund’s investment results are measured based upon the daily NAV of the Fund. Investors purchasing and selling shares in the secondary market may not experience investment results consistent with those experienced by Authorized Participants creating and redeeming directly with the Fund. 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. Non-Diversification Risk — The Fund is classified as "non-diversified" under the Investment Company Act of 1940 ("1940 Act"), and has the ability to invest a relatively high percentage of its assets in the securities of a small number of issuers susceptible to a single economic, political or regulatory event, or in financial instruments with a single counterparty or a few counterparties. This may increase the Fund's volatility and cause performance of a relatively smaller number of issuers or the credit of one or a relatively smaller number of counterparties to have a greater impact on the Fund's performance. Notwithstanding the Fund's status as a "non-diversified" investment company under the 1940 Act, the Fund intends to qualify as a "regulated investment company" ("RIC") accorded special tax treatment under the Internal Revenue Code, which imposes its own diversification requirements that are less restrictive than the requirements applicable to "diversified" investment companies under the 1940 Act. Online Retail Companies Risk — Companies that operate in the online marketplace and retail segments are subject to fluctuating consumer demand. Unlike traditional brick and mortar retailers, online marketplaces and retailers must assume shipping costs or pass such costs to consumers. Consumer access to price information for the same or similar products may cause companies that operate in the online marketplace and retail segments to reduce profit margins in order to compete. Due to the nature of their business models, companies that operate in the online marketplace and retail segments may also be subject to heightened cybersecurity risk, including the risk of theft or damage to vital hardware, software and information systems. The loss or public dissemination of sensitive customer information or other proprietary data may negatively affect the financial performance of such companies to a greater extent than traditional brick and mortar retailers. As a result of such companies being web-based and the fact that they process, store, and transmit large amounts of data, including personal information, for their customers, failure to prevent or mitigate data loss or other security breaches, including breaches of vendors’ technology and systems, could expose companies that operate in the online marketplace and retail segments or their customers to a risk of loss or misuse of such information, adversely affect their operating results, result in litigation or potential liability, and otherwise harm their businesses. Though ProShare Advisors believes that investing in Online Retailers is attractive because online sales have been rapidly rising, there is no guarantee that this trend will continue. Each of these factors could have a negative impact on the performance of the companies in the Index and the performance of the Fund. Portfolio Turnover Risk — In seeking to meet its investment objective, 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 transactions increase brokerage and other transaction costs and may result in increased taxable capital gains. Retailing Industry Risk — The Fund is subject to the risks faced by companies in the retailing industry to the same extent as the Index is so concentrated, including: changes in domestic and international economies, consumer confidence, disposable household income and spending, and consumer tastes and preferences; intense competition; changing demographics; marketing and public perception; dependence on third-party suppliers and distribution systems; intellectual property infringement; legislative or regulatory changes and increased government supervision; thin capitalization; dependence on a relatively few number of high volume sales days to achieve overall results; and dependence on outside financing, which may be difficult to obtain. The retailing industry may also be affected by risks that affect the broader consumer discretionary industry. Small-and Mid-Cap Company Investment Risk — The Index and, by extension, the Fund are exposed to stocks of small-and mid-cap companies. The risk of equity investing may be particularly acute for securities of issuers with smaller market capitalizations. Small- and mid-cap companies may have limited product lines or resources, may be dependent upon a particular market niche and may have greater fluctuations in price than the stocks of larger companies. Small- and mid-cap companies may lack the financial and personnel resources to handle economic or industry-wide setbacks and, as a result, such setbacks could have a greater effect on small- and mid-cap security prices. Additionally, small- and mid-cap company stocks may trade at greater spreads or lower trading volumes, and may be less liquid than the stocks of larger companies. Further, stocks of small- and mid-sized companies could be more difficult to liquidate during market downturns compared to larger, more widely traded companies. Software and Services Industry Risk — The Fund is subject to the risks faced by companies in the software and services industry to the same extent as the Index is so concentrated, including: 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. Tax Risk — In order to qualify for the special tax treatment accorded a 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 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, portfolio securities may be valued using techniques other than market quotations. The value established for a portfolio security may be different from what would be produced through the use of another methodology or if it had been priced using market quotations. Portfolio securities that are valued using techniques other than market quotations, including “fair valued” securities, 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 a Fund could sell a portfolio security for the value established for it at any time, and it is possible that the Fund would incur a loss because a portfolio security is sold at a discount to its established value. Please see “Investment Objectives, Principal Investment Strategies and Related Risks” in the back of the Fund’s Full Prospectus for additional details.
Risk Lose Money [Text]	rr_RiskLoseMoney	You could lose money by investing in the Fund.
Risk Nondiversified Status [Text]	rr_RiskNondiversifiedStatus	Non-Diversification Risk — The Fund is classified as "non-diversified" under the Investment Company Act of 1940 ("1940 Act"), and has the ability to invest a relatively high percentage of its assets in the securities of a small number of issuers susceptible to a single economic, political or regulatory event, or in financial instruments with a single counterparty or a few counterparties. This may increase the Fund's volatility and cause performance of a relatively smaller number of issuers or the credit of one or a relatively smaller number of counterparties to have a greater impact on the Fund's performance. Notwithstanding the Fund's status as a "non-diversified" investment company under the 1940 Act, the Fund intends to qualify as a "regulated investment company" ("RIC") accorded special tax treatment under the Internal Revenue Code, which imposes its own diversification requirements that are less restrictive than the requirements applicable to "diversified" investment companies under the 1940 Act.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	Investment Results
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	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.
Performance One Year or Less [Text]	rr_PerformanceOneYearOrLess	After the Fund has a full calendar year of performance information, performance information will be shown on an annual basis.
ProShares Online Retail ETF | ProShares Online Retail ETF
Risk/Return:	rr_RiskReturnAbstract
Management Fees	rr_ManagementFeesOverAssets	0.58%
Other Expenses	rr_OtherExpensesOverAssets	none	[1]
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	0.58%
1 Year	rr_ExpenseExampleYear01	$ 59
3 Years	rr_ExpenseExampleYear03	$ 186

[1] “Other Expenses” are based on estimated amounts for the current fiscal year.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	PROSHARES TRUST
Prospectus Date	rr_ProspectusDate	Jul. 09, 2018
Document Creation Date	dei_DocumentCreationDate	Jul. 09, 2018