all or none A stipulation of an order which instructs the broker to either fill the whole order or not to fill it at all. At E*TRADE, AON orders must be for 300 shares or more. For option orders, the Chicago Board of Exchange (CBOE), the Boston Options Exchange (BOX), and the Nasdaq Options Market (NOM) do not accept All-Or-None orders (AON). "AON" may affect the pricing of your order if the CBOE, BOX, or NOM is the "best market" relative to Auto-Routing.
|