Alphabetical - O

Obligor	A person who has an obligation (by a legal binding) to pay off debt.
Off The Run	Once a new security (of any particular maturity) is issued the previously issued security with the same maturity becomes "off the run".
Offer for Sale	A method of bringing a company to the market. may be a fixed price or by tender (same as IPO in the UK)
Offer Price	see Ask Price
Offer Rate	The dealers selling price
On The Run	The most recently issued security of any particular maturity.
OPEC	Organisation of Petroleum Exporting Countries
Open Cry	??
Open Interest	The total number of long posiitons outstanding in a futures contract (equals the total number of short positions).
Open Outcry	Face to face trading
Option	The right to buy or sell an asset.
Option Class	All options of the same type (call or put) on a particular stock.
Option Dated Forward Rate	A forward rate (foreign exchange), but the date is more flexible.
Option Series	All options of a certain class with the same strike price and expiration date.
Options	The right but not the obligation to buy/sell equities, bonds, foreign exchange or interest rate contracts by a future date at a price agreed now. Traded options means the options themselves can be bought or sold.
Order Book	SETS (Stock Exchange Trading System)
Order Book Official	see Board Broker
Ordinary Share	The most common also the riskest type of share
Original Issue Discount	??
Out-Of-The-Money Option	Either - a call option where the asset price is less than the strike price or - a put option where the asset price is greater than the strike price.
Outright	The sale or purchase of a currency for delivery on any date other than spot.
Over The Counter	Dealing outside a trading exchange, for example a currency option purchased from a bank.
Overfunding	The issue of government bonds or treasury bills not for immediate government borrowing needs but as an instrument of monetary control
Overnight	Transaction for settlement tomorrow, taken out today.

Obligor A person who has an obligation (by a legal binding) to pay off debt.
Off The Run Once a new security (of any particular maturity) is issued the previously issued security with the same maturity becomes "off the run".
Offer for Sale A method of bringing a company to the market. may be a fixed price or by tender (same as IPO in the UK)
Offer Price see Ask Price
Offer Rate The dealers selling price
On The Run The most recently issued security of any particular maturity.
OPEC Organisation of Petroleum Exporting Countries
Open Cry ??
Open Interest The total number of long posiitons outstanding in a futures contract (equals the total number of short positions).
Open Outcry Face to face trading
Option The right to buy or sell an asset.
Option Class All options of the same type (call or put) on a particular stock.
Option Dated Forward Rate A forward rate (foreign exchange), but the date is more flexible.
Option Series All options of a certain class with the same strike price and expiration date.
Options The right but not the obligation to buy/sell equities, bonds, foreign exchange or interest rate contracts by a future date at a price agreed now. Traded options means the options themselves can be bought or sold.
Order Book SETS (Stock Exchange Trading System)
Order Book Official see Board Broker
Ordinary Share The most common also the riskest type of share
Original Issue Discount ??
Out-Of-The-Money Option Either - a call option where the asset price is less than the strike price or - a put option where the asset price is greater than the strike price.
Outright The sale or purchase of a currency for delivery on any date other than spot.
Over The Counter Dealing outside a trading exchange, for example a currency option purchased from a bank.
Overfunding The issue of government bonds or treasury bills not for immediate government borrowing needs but as an instrument of monetary control
Overnight Transaction for settlement tomorrow, taken out today.