A securities firm is classified as an agent when it acts on behalf of its clients as buyer or seller of a security. The agent does not own the security at any time during the transaction. All-or-None [..]

The simultaneous purchase of a security on one stock market and the sale of the same security on another stock market at prices which yield a profit. Ask or Offer:

The aggregate size in board lots of the most recent ask to sell a particular security. Assets:

The notification to the seller of an option by the clearing corporation that the buyer of the option is enforcing the terms of the option's contract. At-the-Money:

Buying more of a security at a price that is lower than the price paid for the initial investment. The aim of averaging down is to reduce the average cost per unit of the investment. Basis Point:

A market in which stock prices are falling. Beta:

The highest price a buyer is willing to pay for a stock. When combined with the ask price information, it forms the basis of a stock quote. Bid Size:

A mathematical model used to calculate the theoretical price of an option. Blue Chip Stocks:

A mathematical model used to calculate the theoretical price of an option. Blue Chip Stocks:

Promissory notes issued by a corporation or government to its lenders, usually with a specified amount of interest for a specified length of time. Book: