Broker: Broker is a company or individual that executes futures and options orders on behalf of financial and commercial institutions and/or the general public. A broker charges a fee or commission for executing buy or sell orders for a customer. In commodity futures trading, the term may refer to:
a) a Floor broker, a person who actually executes orders on the trading floor of an exchange;
b) an Account executive or associated person, the person who deals with customers in the offices of futures commission merchants;
c) the futures commission merchant.
Carrying Broker: Carrying Broker is a member of a futures exchange, usually a clearinghouse member, through which another firm, broker or customer chooses to clear all or some trades. Carrying Broker is An exchange member firm, usually a futures commission merchant.
Contract: Contract is a term of reference describing a unit of trading for a commodity future or option. At the same time contract is an agreement to buy or sell a specified commodity, detailing the amount and grade of the product and the date on which the contract will mature and become deliverable.
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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.