Close: Close is the exchange-designated period at the end of the trading session during which all transactions are considered made "at the close."
Commission: Commission is a fee charged by a broker or brokerage house (company) to a customer (trader) for executing a transaction. In the future market commission is
1) The charge made by a futures commission merchant for buying and selling futures contracts;
2) the fee charged by a futures broker for the execution of an order. Note: when capitalized, the word Commission usually refers to the CFTC.
Futures: Futures (also called Futures Contract) is a legally binding agreement to buy or sell a commodity or financial instrument at a later date. Futures contracts are normally standardized according to the quality, quantity, delivery time and location for each commodity, with price as the only variable.
Omnibus Account: Omnibus Account is an account carried by one Futures Commission Merchant (FCM) with another FCM in which the transactions of two or more persons are combined and carried in the name of the originating FCM rather than of the individual customers; the opposite of Fully Disclosed. An originating broker must use an omnibus account to execute or clear trades for customers at a particular exchange where it does not have trading or clearing privileges.
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Naked options trading is very risky - many people lose money trading them. It is recommended contacting your broker or investment professional to find out about trading risk and margin requirements before getting involved into trading uncovered options.