An order to a broker to sell a security. A sell order may take any of a number of forms. Depending on the nature of the order, the broker may execute it at the best available price when the order is made, at a set price designated by the client, or according to a more complicated formula. Additionally, the sell order may or may not have an expiration date (though most do). See also: Buy order.
A brokerage order to sell a specified amount of a security.