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  • Odd Lot
    Trading order for less than 100 shares.

  • Off-board
    A listed stock transaction not completed on a national exchange or an OTC transaction of an unlisted transaction.

  • Offer
    The lowest price that any person will sell a security.

  • Open order
    An order to buy or sell a security that remains in effect until it is either cancelled by the customer or executed.

  • Open position
    A net long or short position whose value will change with a price change.

  • Open-end fund
    An investment company (a mutual fund) that sells new shares to the public and redeems its outstanding shares on demand.

  • 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.

  • Over the counter (OTC)
    A market for securities not listed on an exchange, as well as the principal bond market.

  • Overbought
    An analytical term for a stock that is too expensive.

  • Oversold
    An analytical term for a stock that is underpriced.