M
Margin
To buy a security by borrowing funds from a brokerage house. The margin requirement - the maximum percentage of the investment that can be loaned by the br...
Margin Requirement (for options)
The amount an uncovered (naked) option writer is required to deposit and maintain to cover a position. The margin requirement is calculated daily.
Mark-To-Market
An accounting process by which the price of securities held in account are valued each day to reflect the last sale price or market quote if the last sale...
Market Basket
A portfolio of common stocks whose performance is intended to simulate the performance of a specific index. See Index.
Market Not Held Order
Also a market order, but the investor is allowing the floor broker who is executing the order to use his own discretion as to the exact timing of the execu...
Market Order
An order to buy or sell securities at the current market. The order will be filled as long as there is a market for the security.
Market-Maker
An exchange member whose function is to aid in the making of a market, by making bids and offers for his account in the absence of public buy or sell order...
Married Put Strategy
A put and stock are considered to be married if they are bought on the same day, and the position is designated at that time as a hedge.
Married Put and Stock
The simultaneous purchase of stock and the corresponding number of put options. This is a limited risk strategy during the life of the puts because the sto...
Model
A mathematical formula designed to price an option as a function of certain variables - generally stock price, striking price, volatility, time to expirati...