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OB (Or Better) - A limit order to buy or sell a security that specifies to the broker that he should try to execute the order at a better price than the limit price. If the broker cannot do so, the order will be executed at the limit price. The abbreviation "OB" must be written on the order ticket.
Objective (Mutual Funds) - A fund's investment strategy category as stated in the prospectus.
Odd Lot - A quantity of securities that is smaller than the standard unit of trading, which is usually 100 shares.
Offer - The price at which the market maker will sell shares to investors.
Offer for Sale - A method of bringing a company to the market. The public can apply for shares directly at a fixed price. A prospectus containing details of the sale must be printed in a national newspaper.
Offer Price - The price at which the market maker will sell shares to investors.
Offshore - An international term to describe a jurisdiction which is out of your tax reach of your country of residence or citizenship.
OID (Original Issue Discount) - A new bond issue that is usually offered below par. The bond's value is increased (accreted) over its life from the original discounted price up to par. At the bond's maturity, it will be valued at par. Interest on these types of bonds may not be paid until maturity. However, the interest is taxed as it is accreted. An example of an OID is a zero coupon bond.
Old Economy - Refers to established companies focusing more on industrial and manufacturing services. 
Open-End Fund - A mutual fund that makes a continuous offering of its shares and stands ready to buy its shares upon surrender by the shareholders. The share value is determined by net asset value of the fund.
Open-End Investment Company - A mutual fund; an investment company which stands ready to sell essentially an unlimited number of shares and to redeem shares at net asset value (less any applicable charges) upon shareholder request.
Open-End Management Company - A management company that is constantly issuing new shares.
Open Order - A good-til-canceled order. It stays in effect until it is either canceled or executed.
Option - A contract that entitles the buyer to buy (call) or sell (put) a predetermined quantity of an underlying securities for a specific period of time at a pre-established price.
Options Clearing Corporation (OCC) - A clearing corporation owned jointly by the exchanges dealing in listed options. OCC is the central or main Clearing Corporation for listed options. Options traded on any SEC-regulated exchange can be settled through OCC.
Order Book Official (OBO) - An employee of certain exchanges who executes limit orders on behalf of the membership.
Order Department - The department within a brokerage firm that is responsible for sending the customers’ orders to the proper market for execution.
Order Ticket - A form that is completed by a broker when receiving an order from a client. The order ticket will show the type of order (buy or sell), the number of shares, the security's name, the price qualifications (such as market or limit) and the client's name and account number.
Ordinary Shares - The most common form of share. Holders receive dividends that vary in amount in accordance with the profitability of the company and recommendations of the directors. The holders are the owners of the company. Also known as Common Stock.
Original Issue Zeros - Zero-coupon securities originally issued by a corporation, government, or governmental subdivision as zeros. A zero-coupon security not created by severing interest and principal payments from a preexisting bond.
OTC Bulletin Board - An electronic service that provides selected quotes on over-the-counter stocks.
OTC Options - Options created by OTC firms.
Other Current Assets - Value of non-cash assets, including prepaid expenses and accounts receivable, due within one year.
Overbought\Oversold Indicator - An indicator that attempts to define when prices have moved too far and too fast in either direction and thus are vulnerable to reaction.
Over-The-Counter Market (OTC) - A market for securities that are not listed on an exchange. Security orders are transacted via telephone and a computer network that connect dealers. As opposed to the NYSE, which is an auction market, the OTC is a negotiated market. OTC dealers may either act either as principals or as agents for customers. The OTC market is regulated by the NASD.
Ownership - Ownership constitutes the holding or possession of limited liability company legal claim or title to an offshore asset.