- o -

• October : Month
• OffBook : MDOriginType
• Offer : MDEntryType
• OfficialClosingPrice : TradeCondition
• One : NoMarketSegments
• OneProductStripNot : AllowOneProductStrip
• OneProductStripNotAllowed : AllowOneProductStrip
• OneSidedQuoteAllowed : QuoteSideIndicator
• OneSidedQuoteNotAllowed : QuoteSideIndicator
• Open : TESTradSesStatus , TradSesStatus
• OpeningAuction : MatchSubType , MDEntryType , SecurityMassTradingStatus , SecurityTradingStatus
• OpeningAuctionFreeze : SecurityMassTradingStatus , SecurityTradingStatus
• OpeningAuctionTrade : TrdType
• OpeningPrice : MDEntryType , TradeCondition
• OpenInterest : MDEntryType
• Option : SecurityType
• OptionalRefresh : RefreshIndicator
• OrderBookExecution : MarketDataType
• OrderBookMaintenance : MarketDataType
• OrderBookSnapshot : MarketDataType
• OrderDepth : BookType
• OrderImbalance : QuoteCondition
• OTC : TrdType
• Other : SecurityType , SettlSubMethod , WarrantType
• OutOfSequence : TradeCondition
• OutOfSequenceETH : TradeCondition
• Overlay : MDUpdateAction