Must-Be-Filled (MBF) Order

Orders placed before the market opens to buy or sell shares of stocks when their options expire. These orders are guaranteed a complete fill at the opening price to offset expiring options. They must be ordered between 4:15 p.m. and 5:00 p.m. on the Thursday before the third Friday of each month.

Margin Call

This is a demand for a client to deposit money or securities into a margin account. This can occur when a purchase is made in excess of the value of the margin account or when the value of an account decreases because the value of the securities held decreases regardless of whether a new purchase is made or not.

Market

The place where buyers and sellers meet to exchange goods and services. It also represents the actual or potential demand for a product or service.

Net Change

The difference between the previous day’s closing price and the last traded price.