Leverage (All Funds, except the Matching ProShares Funds, the Managed Futures Strategy ETF, the Crude Oil Strategy ETF, the Bitcoin Futures Strategy ETF, the Short Bitcoin Futures Strategy ETF, the Blockchain/Bitcoin Strategy ETF, and the Bitcoin Futures/Equity Strategy ETF the Short (-1x) ProShares Funds and the CDS Short North American HY Credit ETF)

The Fund generally does not expect to invest directly in futures contracts, option contracts and swap agreements (“Bitcoin Instruments”). The Fund expects to gain exposure to these investments by investing a portion of its assets in the ProShares Cayman Short Bitcoin Futures Strategy Portfolio, a wholly-owned subsidiary of the Fund organized under the laws of the Cayman Islands (the “Subsidiary”). The Subsidiary is advised by ProShare Advisors, the Fund’s investment advisor, and invests directly in Bitcoin Instruments. Unlike the Fund, the Subsidiary is not an investment company registered under the 1940 Act. The Fund’s investment in the Subsidiary is intended to provide the Fund with exposure to commodity markets related to bitcoin in accordance with applicable rules and regulations. The Fund will invest up to 25% of its total assets in the Subsidiary. Except as otherwise noted, references to the Fund’s investment strategies and risks include the investment strategies and risks of the Subsidiary.
On 21 November 2017, the Tether cryptocurrency announced they were hacked, losing $31 million in USDT from their primary wallet.[89] The company has 'tagged' the stolen currency, hoping to 'lock' them in the hacker's wallet (making them unspendable). Tether indicates that it is building a new core for its primary wallet in response to the attack in order to prevent the stolen coins from being used.
Each Fund may invest in a wide range of fixed income securities, which may include foreign sovereign, sub-sovereign and supranational bonds, as well as any other obligations of any rating or maturity such as foreign and domestic investment grade corporate debt securities and lower-rated corporate debt securities (commonly known as “junk bonds”). Lower-rated or high yield debt securities include corporate high yield debt securities, zero-coupon securities, payment-in-kind securities, and STRIPS. Investment grade corporate bonds are those rated BBB or better by Standard & Poor’s Rating Group (“S&P”) or Baa or better by Moody’s Investor Services (“Moody’s”). Securities rated BBB by S&P are considered investment grade, but Moody’s considers securities rated Baa to have speculative characteristics. See Appendix A for a description of corporate bond ratings. The Funds may also invest in unrated securities.
  •   The bitcoin exchanges on which bitcoin trades are relatively new and, in most cases, largely unregulated and, therefore, may be more exposed to fraud and security breaches than established, regulated exchanges for other products. Over the past several years, a number of Bitcoin Exchanges have been closed due to fraud, failure, security breaches or governmental regulations. The nature of the assets held at Bitcoin Exchanges make them appealing targets for hackers and a number of Bitcoin Exchanges have been victims of cybercrimes. No Bitcoin Exchange is immune from these risks. Fraudulent activity can increase volatility and have an adverse effect on the price of bitcoin, the general acceptance of bitcoin as an investment or means of currency and could have a negative impact on the bitcoin futures contracts in which the Fund invests and the value of the Fund.
There are many groups on Facebook where you can find likeminded folks who will happily talk crypto all day but the problem is that 99% of these groups are filled with people who have only a very basic understanding of cryptocurrency and the knowledge available here is not particularly strong. I have recently left almost every single group on Facebook as, in my opinion, they are largely filled with FUD.
risk of loss of the amount expected to be received under a swap agreement in the event of the default or bankruptcy of a swap agreement counterparty. If such a default occurs, a Fund will have contractual remedies pursuant to the swap agreements, but such remedies may be subject to bankruptcy and insolvency laws that could affect the Fund’s right as a creditor. The counterparty risk for cleared swaps is generally lower than for uncleared over-the-counter swaps because generally a clearing organization becomes substituted for each counterparty to a cleared swap agreement and, in effect, guarantees the parties’ performance under the contract as each party to a trade looks only to the clearing organization for performance of financial obligations. However, there can be no assurance that the clearing organization, or its members, will satisfy its obligations to a Fund. Upon entering into a cleared swap, a Fund may be required to deposit with the broker an amount of cash or cash equivalents in the range of approximately 3% to 6% of the notional amount for CDS on high yield debt issuers and 1% to 5% for CDS on investment grade debt issuers (this amount is subject to change by the clearing organization that clears the trade). This amount, known as “initial margin,” is in the nature of a performance bond or good faith deposit on the cleared swap and is returned to a Fund upon termination of the swap, assuming all contractual obligations have been satisfied. Subsequent payments, known as “variation margin” to and from the broker will be made daily as the price of the swap fluctuates, making the long and short position in the swap contract more or less valuable, a process known as “marking-to-market.” The premium (discount) payments are built into the daily price of the swap and thus are amortized through the variation margin. The variation margin payment also includes the daily portion of the periodic payment stream.
  •   The technology is new and many of its uses may be untested. Blockchain technology is a new and developing technology protocol that is relatively untested and unregulated. The mechanics of using distributed ledger technology to transact in other types of assets, such as securities or derivatives, is less clear. Blockchain technology may never develop optimized transactional processes that lead to realized economic returns for any company in which the Fund invests.
Amounts not distributed on a timely basis in accordance with a prescribed formula are subject to a nondeductible 4% excise tax at the Fund level. To avoid the tax, each Fund must distribute during each calendar year an amount generally equal to the sum of (1) at least 98% of its ordinary income (not taking into account any capital gains or losses) for the calendar year, (2) at least 98.2% of its capital gains in excess of its capital losses (adjusted for certain ordinary losses) for a one-year period generally ending on October 31
Having said that, bitcoin price action remains fraught with wild and inexplicable gaps, like a $400 drop and rise in an hour in the late hours of July 30, according to Bloomberg.  This particular trade, and unwind seems to have affected bitcoin pricing globally and likely impacted trading of the U.S. listed contracts as well.  Volumes and open interest seemed to have increased around the time of this large trade unwind.  It could be a coincidence, though I suspect that some smart traders, aware of the situation, put short trades on in these future contracts to take advantage of the forced unwind.
If you are “going long” on Bitcoin, you assume that Bitcoin prices will go up. And if you expect Bitcoin prices to go up, you are interested in buying call options – options that enable you to buy Bitcoin at a predetermined price in the future. For example, if the current Bitcoin price is 5,000 USD and you expect it to rise to 8,000 USD 6 months from now, you would certainly pay good money for a call option that allows you to purchase Bitcoin for 5000 USD in 6 months, when everyone else is buying for 8,000 USD.

You could imagine the spread going the other way, though. If everyone really was clamoring to short bitcoin, and if the futures offered a more convenient way to do it than the bitcoin exchanges, then you'd expect the short sellers to pay a premium to short via futures. Instead of selling a bitcoin at $18,000 today, they'd be willing to sell a synthetic bitcoin for $17,500, paying the spread to an arbitrageur who was willing to do the actual shorting for them. But the fact that the spread is mostly positive, and that bitcoin's price has been mostly going up, suggests that the demand has mostly been for synthetic long positions, not short.
Certain debt securities may be treated as debt securities that were originally issued at a discount. Original issue discount can generally be defined as the difference between the price at which a security was issued and its stated redemption price at maturity. Original issue discount that accrues on a debt security in a given year generally is treated for federal income tax purposes as interest income that is included in a Fund’s income and, therefore, subject to the distribution requirements applicable to RICs, even though the Fund may not receive a corresponding amount of cash until a partial or full repayment or disposition of the debt security.

Short Term USD Emerging Markets Bond ETF; Inflation Expectations ETF; CDS Short North American HY Credit ETF; Crude Oil Strategy ETF and Short or Ultra Fixed Income ProShares Funds    2:30 p.m. (3:00 p.m., if transmitted by mail; except 4:00 p.m., if transmitted by mail on behalf of Short High Yield ETF or Ultra High Yield ETF) in order to receive that day’s closing NAV per Share

price of a particular asset, whether a Fund will realize a gain or loss from the purchase or writing (sale) of options on an index depends upon movements in the level of prices for specific underlying assets generally or, in the case of certain indexes, in an industry or market segment. A Fund will not enter into an option position that exposes the Fund to an obligation to another party, unless the Fund either (i) owns an offsetting position in the underlying securities or other options and/or (ii) earmarks or segregates with the Fund’s custodian bank cash or liquid instruments that, when added to the premiums deposited with respect to the option, are equal to the market value of the underlying assets not otherwise covered.

Certain U.S. government securities are issued or guaranteed by agencies or instrumentalities of the U.S. government including, but not limited to, obligations of U.S. government agencies or instrumentalities, such as the Federal National Mortgage Association (“Fannie Mae” or “FNMA”), the Government National Mortgage Association (“Ginnie Mae” or “GNMA”), the Small Business Administration, the Federal Farm Credit Administration, Federal Home Loan Banks, Banks for Cooperatives (including the Central Bank for Cooperatives), Federal Land Banks, Federal Intermediate Credit Banks, the Tennessee Valley Authority, the Export-Import Bank of the United States, the Commodity Credit Corporation, the Federal Financing Bank, the Student Loan Marketing Association, the National Credit Union Administration and the Federal Agricultural Mortgage Corporation. Some obligations issued or guaranteed by U.S. government agencies and instrumentalities, including, for example, GNMA pass-through certificates, are supported by the full faith and credit of the U.S. Treasury. Other obligations issued by or guaranteed by federal agencies, such as those securities issued by FNMA, are supported by the discretionary authority of the U.S. government to purchase certain obligations of the federal agency but are not backed by the full faith and credit of the U.S. government, while other obligations issued by or guaranteed by federal agencies, such as those of the Federal Home Loan Banks, are supported by the right of the issuer to borrow from the U.S. Treasury. While the U.S. government provides financial support to such U.S. government-sponsored federal agencies and instrumentalities described above, no assurance can be given that the U.S. government will always do so, since the U.S. government is not so obligated by law. U.S. Treasury notes and bonds typically pay coupon interest semi-annually and repay the principal at maturity. All U.S. government securities are subject to credit risk.
Bob's transaction confirms first so he goes on BFE and looks at the contract selections. He wants to trade on the January 9 expiration contract. The orderbook is empty and Bob wants to go long (profit off an increase in bitcoin). Since there are no offers available, he places a limit order in the orderbook for a bid at 400 of 1 contract, using his 0.2btc as collateral for the position.
Ann then goes on BFE and she wants to short on bitcoin at market price. She sees that only the January 9 contract has any orders. She could put a limit order in the orderbook if she wanted. However, she sees Bob's bid in the orderbook and decides to fill it, and uses her 0.2btc as margin to collateralize this position. She has just opened a position worth 1 bitcoin that has 5x leverage, and so has Bob.
Currently the front month future is the January contract which at last check could be sold for $17,600.  This contract settles in a cash transfer based on the 4:00 pm eastern bitcoin auction price on Wednesday January 17, 2018 established by Gemini who is partnering with Cboe Global Markets.  The bitcoin price at Gemini is close to $16,600 so I will use that for the underlying bitcoin price in this example. 
The regulation of bitcoin, digital assets and related products and services continues to evolve. The inconsistent and sometimes conflicting regulatory landscape may make it more difficult for bitcoin businesses to provide services, which may impede the growth of the bitcoin economy and have an adverse effect on consumer adoption of bitcoin. There is a possibility of future regulatory change altering, perhaps to a material extent, the nature of an investment in the Funds or the ability of the Funds to continue to operate. Additionally, to the extent that bitcoin itself is determined to be a security, commodity future or other regulated asset, or to the extent that a United States or foreign government or quasi-governmental agency exerts regulatory authority over the Bitcoin Network, bitcoin trading or ownership in bitcoin, the price of bitcoin and the value of the Bitcoin Instruments may be adversely affected, which may have an adverse effect on the value of your investment in the Funds. In sum, bitcoin regulation takes many different forms and will, therefore, impact bitcoin and its usage in a variety of manners. The European Union has recently agreed to rules designed to reduce anonymity of bitcoin transactions, which may impact the supply and demand for bitcoin and bitcoin futures contracts.
When you hear "margin", you may be thinking that you are borrowing money to trade bitcoin futures. This is not quite true. A key feature of these futures contracts is that the leverage comes from counterparties providing it to one another, not from the exchange lending funds and not from any bitcoin being lent from third parties. The contracts are simply like stocks with a market price, which represents the agreements between traders to take the opposing sides of where price of bitcoin will go, so no actual bitcoins are being exchanged per se, however the profit and loss between counterparties is very real!

State the general effect of any contract, arrangements or statute under which any director, officer, underwriter or affiliated person of the registrant is insured or indemnified against any liability incurred in their official capacity, other than insurance provided by any director, officer, affiliated person, or underwriter for their own protection.
Daily access to the PCF and IOPV file is permitted (i) to certain personnel of those service providers that are involved in portfolio management and providing administrative, operational, or other support to portfolio management, including Authorized Participants, and (ii) to other personnel of the Advisor and the Funds’ distributor, administrator, custodian and fund accountant who are involved in functions which may require such information to conduct business in the ordinary course.
Let's not even go into the paradigm shift that this development implies. The growth of a bitcoin futures market positions it even more as a commodity than a currency (in the US, the Commodity Futures Trading Commission regulates futures markets). And even more as an investment asset than a technology that has the potential to change the plumbing of finance.
Most swap agreements entered into by a Fund (but generally not CDS) calculate and settle the obligations of the parties to the agreement on a “net basis” with a single payment. Consequently, a Fund’s current obligations (or rights) under a swap agreement will generally be equal only to the net amount to be paid or received under the agreement based on the relative values of the positions held by each party to the agreement (the “net amount”). Other swap agreements, such as CDS, may require initial premium (discount) payments as well as periodic payments (receipts) related to the interest leg of the swap or to the default of the reference entity.
Now, what if the Bitcoin price is rising? For example, if 1 BTC is worth 5,500 USD, you don’t want to fulfill this contract any more and sell cheap for 5,000 USD. In order to still make things fair for both participants, the exchange (here CME) will make sure that you can sell for the current market price of 5,500 USD if you so wish, but they will compensate your contract partner for this. How? They will take the difference – 500 USD – out of your so-called margin account and give it to Mortimer. This kind of settlement is not only performed on the fulfilment date of the futures contract, but on every trading day, according to the current price of the asset.