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.
Exchange: A central marketplace with established rules and regulations where buyers and sellers meet to trade futures and options contracts or securities. Exchanges include designated contract markets and derivatives transaction execution facilities.
Fill: Fill is the execution of an order.
Floor Broker: A person, individual with exchange trading privileges who, in any pit, ring, post, or other place provided by an exchange for the meeting of persons similarly engaged, executes for another person any orders for the purchase or sale of any commodity for future delivery.
Par: Par refers to the standard delivery point(s) and/or quality of a commodity that is deliverable on a futures contract at contract price. Serves as a benchmark upon which to base discounts or premiums for varying quality and delivery locations. Par in bond markets refers to an index (usually 100) representing the face value of a bond.
Tick: Tick (also referred to as Minimum Price Fluctuation) is the smallest increment of price movement for a futures contract. Tick is a minimum change in price up or down. An up-tick means that the last trade was at a higher price than the one preceding it. A down-tick means that the last price was lower than the one preceding it. See Minimum Price Fluctuation.
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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.