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• October : Month
• OddLot : TradeType
• OffBookAutomated : EfficientMMTOffBookAutomatedIndicator , MmtOffBookAutomatedIndicator
• OffBookCumulQty : StatsUpdateType
• OffBookIncludingVoiceOrMessagingTrading : EfficientMMTMarketMechanism , MmtMarketMechanism
• OffBookNonAutomated : EfficientMMTOffBookAutomatedIndicator , MmtOffBookAutomatedIndicator
• OfferExecutionSummary : MarketDataUpdateType
• OfferOnly : TradingSide
• OfficialDaily : MarketDataPriceType
• OfficialEconomicStatistics : UnderlyingSubtype
• OfficialExpiry : MarketDataPriceType
• OfficialIntraday : MarketDataPriceType
• OfficialMarketClose : MarketDataPriceType
• OfficialOpeningIndex : IndexLevelType
• OfficialYDSP : MarketDataPriceType
• OffMarket : TypeOfMarketAdmission
• OILQ : EfficientMMTNegotiationIndicator
• OmegaClient : AccountType
• OnAndOffBookCumulQty : StatsUpdateType
• OnBookAuctionCumulQty : StatsUpdateType
• OnBookContinuousCumulQty : StatsUpdateType
• OnDemandAuctionEqualFrequentBatchedAuction : EfficientMMTTradingMode , MmtTradingMode
• OnlyIndex : IndexPriceCode
• OnlySessionHigh : IndexPriceCode
• OnlySessionLow : IndexPriceCode
• OPCVMSICOMINonListedFrenchInvestmentFunds : TypeOfMarketAdmission
• Open : OpenedClosedFund
• Opening : TradingPeriod
• OpeningCallPrice : ReferencePriceOrigin
• OpenPrice : StatsUpdateType
• Option : ContractType
• Options : InstrumentCategory , OptiqSegment
• OptionsLiquidationIndex : IndexLevelType
• OrderDriven : MarketModel
• OrderEntryCancelModifyDisabled : OrderEntryQualifier
• OrderEntryCancelModifyEnabled : OrderEntryQualifier
• OrderPriceControlCollarReferencePrice : MarketDataUpdateType
• OsloCashUnderlying : ExchangeCode
• OsloEquityDerivatives : ExchangeCode
• OsloIndexDerivatives : ExchangeCode
• Other : EfficientMMTMarketMechanism , ExerciseStyle , OptionType , PaymentFrequency , TradeType , UnderlyingSubtype , UnderlyingType
• OtherC10 : UnderlyingSubtype
• OtherDerivative : UnderlyingType
• Ounces : InstrumentUnitExpression
• OutOfMainSessionTrading : EfficientMMTTradingMode , MmtTradingMode
• OutOfMarketTrade : MarketDataUpdateType , TradeType
• OutsideOfLPQuotes : StatusReason