Because only a few regulations implementing the straddle rules have been promulgated, the consequences of such transactions to the Funds are not entirely clear. The straddle rules may increase the amount of short-term capital gain realized by a Fund, which is taxed as ordinary income when distributed to shareholders. Because application of the straddle rules may affect the character of gains or losses, defer losses and/or accelerate the recognition of gains or losses from the affected straddle positions, the amount which must be distributed to shareholders as ordinary income or long-term capital gain may be increased or decreased substantially as compared to a Fund that did not engage in such transactions.
Sia is the very first decentralized storage platform that’s based on and secured by the blockchain technology. Through the blockchain tech, Sia can provide much reliable data storage options that do not have a single point of failure, can offer more storage space – at much lower costs than traditional cloud storage providers. Besides the obvious, investors are readily jumping on the Sia-train for one more reason: Privacy. Unlike cloud-storage provides, Sia’s tech gives you all the keys to your own (encrypted) data, and mandates that no third party will control nor access your files.
When you are getting started making actual trades, in general you should focus on making LIMIT ORDERS which will get FILLED by other traders. Not only will you pay lower fees this way, but you will also be making more composed trading setups because you aren't impatiently just market-buying or market-selling into the spread. So a general principle you should follow is to AVOID MARKET ORDERS WHEN YOU CAN! You will pay higher "taker" fees and you will be at the mercy of the spread which is a hidden fee.
Cryptocurrencies are a potential tool to evade economic sanctions for example against Russia, Iran, or Venezuela. In April 2018, Russian and Iranian economic representatives met to discuss how to bypass the global SWIFT system through decentralized blockchain technology.[72] Russia also secretly supported Venezuela with the creation of the petro (El Petro), a national cryptocurrency initiated by the Maduro government to obtain valuable oil revenues by circumventing US sanctions.[73]
  •   A person who exchanges Creation Units for securities generally will recognize a gain or loss equal to the difference between the exchanger’s basis in the Creation Units and the aggregate market value of the securities received and any cash received. However, all or a portion of any loss a person realizes upon an exchange of Creation Units for securities will be disallowed by the Internal Revenue Service if such person purchases other substantially identical shares of the Fund within 30 days before or after the exchange. In such case, the basis of the newly purchased shares will be adjusted to reflect the disallowed loss.

Bitcoin is maintained on the decentralized, open source protocol of the peer-to-peer bitcoin computer network (the “Bitcoin Network”). No single entity owns or operates the Bitcoin Network. The infrastructure of the Bitcoin Network is collectively maintained by a decentralized user base. The Bitcoin Network is accessed through software, and software governs bitcoin’s creation, movement, and ownership. The value of bitcoin is determined in great part by the supply of (which is limited), and demand for, bitcoin in the global exchange markets for the trading of bitcoin (individually, “Bitcoin Exchanges” and collectively, the “Bitcoin Exchange Market”), market expectations for the adoption of bitcoin and the volume of private user-to-user transactions.

Below is a description of various types of money market instruments and other debt instruments that a Fund may utilize for investment purposes, as “cover” for other investment techniques such Fund employs, or for liquidity purposes. Other types of money market instruments and debt instruments may become available that are similar to those described below and in which the Funds also may invest consistent with their investment goals and policies. Each Fund may also invest in pooled investment vehicles that invest in, and themselves qualify as, money market instruments.
Each Fund, except for the S&P 500 Dividend Aristocrats ETF, the S&P MidCap 400 Dividend Aristocrats ETF, the Russell 2000 Dividend Growers ETF, the MSCI EAFE Dividend Growers ETF, the MSCI Europe Dividend Growers ETF, the MSCI Emerging Markets Dividend Growers ETF, the DJ Brookfield Global Infrastructure ETF, the Equities for Rising Rates ETF, the S&P 500 Ex-Energy ETF, the S&P 500 Ex-Financials ETF, the S&P 500 Ex-Health Care ETF, the S&P 500 Ex-Technology ETF, the High Yield—Interest Rate Hedged, the Investment Grade—Interest Rate Hedged and the Short Term USD Emerging Markets Bond ETF, is a “non-diversified” series of the Trust. A Fund’s classification as a “non-diversified” investment company means that the proportion of the Fund’s assets that may be invested in the securities of a single issuer is not limited by the 1940 Act. Notwithstanding each Fund’s status as a “non-diversified” investment company under the 1940 Act, each Fund intends to qualify as a RIC accorded special tax treatment under the Code, which imposes its own diversification requirements on these Funds that are less restrictive than the requirements applicable to the “diversified” investment companies under the 1940 Act. A Fund’s ability to pursue its investment strategy may be limited by that Fund’s intention to qualify as a RIC and its strategy may bear adversely on its ability to so qualify. For more details, see “Taxation” below. With respect to a “non-diversified” Fund, a relatively high percentage of such a Fund’s assets may be invested in the securities of a limited number of issuers, primarily within the same economic sector. That Fund’s portfolio securities, therefore, may be more susceptible to any single economic, political, or regulatory occurrence than the portfolio securities of a more diversified investment company.
(b) diversify its holdings so that, at the end of each quarter of a Fund’s taxable year (or by the end of the 30-day period following the close of such quarter), (i) at least 50% of the fair market value of the Fund’s assets is represented by cash and cash items (including receivables), U.S. government securities, the securities of other RICs and other securities, with such other securities limited, in respect of any one issuer, to a value not greater than 5% of the value of the Fund’s total assets and to an amount not greater than 10% of the outstanding voting securities of such issuer, and (ii) not greater than 25% of the value of its total assets is invested, including through corporations in which the Fund owns a 20% or more voting stock interest, in (x) the securities (other than U.S. government securities and the securities of other RICs) of any one issuer or of two or more issuers that the Fund controls and that are engaged in the same, similar or related trades or businesses, or (y) the securities of one or more qualified publicly traded partnerships (as defined below); and

Now, if that margin-call does not get filled and the price continues to fall, then I'm making profits on my contract but nobody is paying for it since the counterparty who got margin-called didn't get the liquidation order filled. So what happens is that at settlement time of the contract, that unfilled liquidation loss to the system will be deducted from the profits of ALL traders before they are distributed.

A cryptocurrency (or crypto currency) is a digital asset designed to work as a medium of exchange that uses strong cryptography to secure financial transactions, control the creation of additional units, and verify the transfer of assets.[1][2][3] Cryptocurrencies are a kind of alternative currency and digital currency (of which virtual currency is a subset). Cryptocurrencies use decentralized control[4] as opposed to centralized digital currency and central banking systems.[5] The decentralized control of each cryptocurrency works through distributed ledger technology, typically a blockchain, that serves as a public financial transaction database.[6][7]

The Trust’s website has information about the premiums and discounts for each Fund. Premiums or discounts are the differences between the NAV and market price of a Fund on a given day, generally at the time NAV is calculated. A premium is the amount that a Fund is trading above the NAV. A discount is the amount that the Fund is trading below the NAV.
Standard & Poor’s® and S&P® are registered trademarks of Standard & Poor’s Financial Services LLC (“S&P”) and Dow Jones® is a registered trademark of Dow Jones Trademark Holdings LLC (“Dow Jones”). The Indexes are a product of S&P Dow Jones Indices LLC or its affiliates, and have been licensed for use by ProShares. The Funds are not sponsored, endorsed, sold or promoted by S&P Dow Jones Indices LLC, Dow Jones, S&P, any of their third party licensors, or any of their respective affiliates (collectively, “S&P Dow Jones Indices”). S&P Dow Jones Indices does not make any representation or warranty, express or implied, to the owners of the Funds or any member of the public regarding the advisability of investing in securities generally or in the Funds particularly or the ability of the Indexes to track general market performance. S&P Dow Jones Indices’ only relationship to ProShares with respect to the Indexes is the licensing of the Indexes and certain trademarks, service marks and/or trade names of S&P Dow Jones Indices. The Indexes are determined, composed and calculated by S&P Dow Jones Indices without regard to ProShares or the Funds. S&P Dow Jones Indices have no obligation to take the needs of ProShares or the owners of the Funds into consideration in determining, composing or calculating the Indexes. S&P Dow Jones Indices are not responsible for and have not participated in the determination of the prices, and amount of the Funds or the timing of the issuance or sale of the Funds or in the determination or calculation of the equation by which the Funds are to be converted into cash or redeemed, as the case may be. S&P Dow Jones Indices have no obligation or liability in connection with the administration, marketing or trading of the Funds. There is no assurance that investment products based on the Indexes will accurately track index performance or provide positive investment returns. S&P Dow Jones Indices LLC and its subsidiaries are not investment advisers. Inclusion of a security within an index is not a recommendation by S&P Dow Jones Indices to buy, sell, or hold such security, nor is it considered to be investment advice.

Traders A and B in the previous example are hedgers. However, futures contracts, once they exist, can also be bought and sold in their own right. This is where futures get interesting for speculators. Say that Speculator X believes the price of a ton of pork belly will rise to 1,200 USD in 3 months’ time, so buying the futures contract at 1,000 USD is a good deal. He can then sell the contract to bacon producers who want to buy pork bellies at 1,000 USD. The option to buy at a specified price in the future is known as a call option. The price of call options rise when traders assume that the price of the underlying asset will rise.