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Tuesday, July 12, 2011 10:54:52 AM
AON - All Or None - These orders ensure that if and when you do get an order fill, you get all of the shares you requested in one batch. This guarantees you will not get a partial fill, a frustrating occurrence with penny stocks especially when a market maker only has 5,000 shares to sell you. AON's can be handy if you don't want to deal with partials, but it can severely limit your ability to get timely fills, or fills at all. These orders tend to be processed much slower than a standard limit order, and you might not get a fill at the best asking price or even the next best. TDAmeritrade states that "AON orders have the lowest priority in the market." They also tend to only match the order with a single market maker, so that MM needs to have the full amount of shares for you to have a shot at any.
Another thing to note with AON orders is that they will not show on the Level 2 quote. The market makers won't quote your order because it is conditional upon a seller having the full amount of shares, at once, for your orders to match. To avoid the confusion and frustration of - "Why won't my order fill! There's a MM right there!!" - they simply don't quote AON orders.
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