- o -

• Odd : LotType
• OddLot : OrderType
• Off : HiddenQuantity
• Offsetting : TradeType
• OnlyBest : OrderType
• Open : OpenClose , OpenCloseRequest
• OpenAllocation : DealSource
• OrderAltered : OrderState
• OrderDeleted : OrderState
• OutOfMemory : ErrorCode
• OutsideCombo : DealSource
• OverrideCrossing : OrderType
• OverrideCrs : ExchangeOrderType
• Overtaking : TradeType