An order to buy or sell a security which remains in place until it is either executed or cancelled.
Open range
Price (or price range) recorded during the opening period of the market.
Open-end fund
A mutual fund with no limit to the number of shares that can be issued.
Open-outcry
A public auction method of trading conducted by calling out bids and offers across a trading ring or pit and having them accepted.
Option
A contract conferring the right but not the obligation to buy (call) or to sell (put) a specified amount of an instrument at a specified price within a predetermined time period.
Option class
All options of the same type – calls or puts – listed on the same underlying instrument.
Option series
All options of the same class having the same exercise/strike price and expiration date.
Optionspreis
German for premium. The price a put or call buyer must pay to a put or call seller for an option contract.
Optionsscheine
German for warrant.
Order book
Compiled list of orders received that are away from the current best price in the market.
