O OAS Objective (mutual funds) Obligation Obligation bond Obligor OCC Odd lot Odd-lot dealer Odd-lot short-sale ratio Odd-lot theory OEX index Off-balance-sheet financing Off-board Offer Offer price Offer wanted Offering date Offering memorandum Offering scale Offerings Off-floor order Office of Thrift Supervision (OTS) Official reserves Official statement Official unrequited transfers Offset Offshore finance subsidiary OID Old-line factoring Oligopoly Oligopsony OM Stockholm AB Omitted dividend Omnibus account On On a clean up On balance On board On the close order On the money On the opening order On the print On the run On the sidelines On the take On the tape One-decision stock One-factor APT One-man picture One-share-one-vote rule One-way market On-floor order OPD OPEC Open Open (good-till-cancelled) order (GTC order) Open account Open book Open contracts Open depending on the floor Open interest Open on the print Open position Open repo Open up Open-end credit Open-end fund Open-end lease Open-end mortgage Opening Opening price Opening purchase Opening sale Opening transaction Open-market operation Open-market purchase operation Open-market rates Open-outcry Operating cash flow Operating cycle Operating exposure Operating in the red Operating lease Operating leverage Operating profit (or loss) Operating profit margin Operating rate Operating ratio Operating risk Operationally efficient market Operations department Opinion shopping OPM Oporto Opportunity cost of capital Opportunity costs Opportunity set Optimal contract Optimal portfolio Optimal redemption provision Optimization approach to indexing Optimum capacity Option Option account Option agreement Option cycle Option elasticity Option holder Option margin Option mutual fund Option not to deliver Option premium Option price Option seller Option series Option spread Option writer Option-adjusted spread (OAS) Optional dividend Optional payment bond Options Clearing Corporation (OCC) Options contract Options contract multiple Options on physicals Or better Oral contract Order Order imbalance Order room Order splitting Order ticket Ordinary income Ordinary interest Ordinary shares Organization chart Organization of Petroleum Exporting Countries (OPEC) Organized exchange Original face value Original issue discount debt (OID debt) Original margin Original maturity Origination Originator Orphan stock Oslo Stock Exchange OTC Bulletin Board OTC margin stock Other capital Other current assets Other income Other long-term liabilities Other sources Out Out of line Out of print Out of the name Out there Out with Out-of-favor industry or stock Out-of-the-money option Outright rate Outside director Outside market Outside of you Outsourcing Outstanding Outstanding share capital Outstanding shares Overage Overall market price coverage Overbought Overbought-oversold indicator Overdraft Overfunded pension plan Overhang Overhead Overheating Overissue Overlap the market Overlapping debt Overlay strategy Overnight delivery risk Overnight position Overnight repo Overperform Overreaching Overreaction hypothesis Overshooting Oversold Oversubscribed issue Oversubscription privilege Over-the-counter (OTC) Overtrading Overvalued Overwithholding Overwriting Owner's equity