Welcome to the RJO Futures trading terms glossary. Within this glossary, you will find an expansive list of trading terms covering commodity, option, and futures trading terminology. Bookmark this section as a quick reference for definitions of trading terms as you browse the Internet and our site for more information on futures and options trading within the financial and commodities markets.


Or Better Close Only

AKA: OBCO A variation of a limit order in which the market has a closing range at or better than the specified limit. The order can be executed only at the closing range of the trading session.