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Odd Lot
Trading order for less than 100 shares.
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Off-board
A listed stock transaction not completed on a national exchange or an OTC transaction of an unlisted transaction.
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Offer
The lowest price that any person will sell a security.
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Open order
An order to buy or sell a security that remains in effect until it is either cancelled by the customer or executed.
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Open position
A net long or short position whose value will change with a price change.
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Open-end fund
An investment company (a mutual fund) that sells new shares to the public and redeems its outstanding shares on demand.
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Option
An instrument that gives the owner the right to buy or sell a specified number of shares of a specified stock at a specified price within a specified period of time. A Call option allows the buyer to purchase the underlying stock at any time up to the expiration date of the contract. A Put option allows the buyer to sell the underlying stock at any time up to the expiration date of the contract.
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Over the counter (OTC)
A market for securities not listed on an exchange, as well as the principal bond market.
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Overbought
An analytical term for a stock that is too expensive.
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Oversold
An analytical term for a stock that is underpriced.