E*Trade, and I assume many other of the online brokerages, have the facility for showing only a portion of your order to the market. I hasten to add that I am not recommending E*Trade, and, as with all of E*Trades's fancy trading tools (hidden stops, for example), it often isn't available when you want it. If I remember correctly, you can't use it on any bulletin board stock, and of course you can't send such an order to the NYSE, etc., etc. But there may be other brokerages that have this capability and are more reasonable in the ways they will let you use it. Just a thought.