Try this!!!
By default, TWS uses the double bid/ask method to trigger simulated stop, simulated stop-limit, and trailing stop orders for OTC stocks and U.S. options. Use the Trigger Configuration box to modify the trigger method for these order types. All other order types must use the last method.
To modify the stop trigger method (valid for OTC stocks and U.S. options ONLY)
Right-click on the market data line for a stop, stop-limit, or trailing stop order and select Trigger Method.
Select the trigger method to use for the current transaction.
Trigger Method
Description
Last
For a sell (buy) order to be triggered, one last price value must be less than (greater than) or equal to the trigger price.
Double last
For a sell (buy) order to be triggered, two consecutive last price values must be less than (greater than) the trigger price.
Double bid/ask
For a sell (buy) order to be triggered, two consecutive ask price (bid price) values must be less than (greater than) or equal to the trigger price.
Here is the Nasdaq specific bit as Stop Orders are not native...
Stop Orders
Description
A Stop order becomes a market order to buy or sell securities or commodities once the specified stop price is attained or penetrated. A Stop order is not guaranteed a specific execution price, and may execute significantly away from its stop price. A Sell Stop order is always placed below the current market price of the security or commodity. It is typically used to limit a loss or protect a profit on a long stock position. A Buy Stop order is always placed above the current market price. It is typically used to limit a loss or protect a profit on a short sale. Some exchanges natively accept and process Stop orders according to the standard industry definition of the term. For those exchanges that do not natively execute stop orders, IB simulates such stop orders with the following default triggers:
Sell Simulated Stop Orders become market orders when the last traded price is less than or equal to the stop price. Additional sell stop order protection is provided for NASDAQ stocks and US Equity Options which are only triggered after two offer prices are less than or equal to the stop price.
Buy Simulated Stop Orders become market orders when the last traded price is greater than or equal to the stop price. Additional buy stop order protection is provided for NASDAQ stocks and US Equity Options which are only triggered after two bid prices are greater than or equal to the stop price.
For US equity and options markets, stop orders will only be elected by prices posted during normal NYSE trading hours (9:30 a.m. to 4 p.m. New York Time, Monday to Friday). In addition for NYSE listed stock Best Execution stop orders, the order will not be elected until the NYSE displays a BBO.
Custom Stop order triggers may also be specified to override the default triggers. Single last price, two last prices, and two bid ask price triggers are available by highlighting any market data line and selecting "Trigger Method" from the right-click menu.
Note that if you modify the stop trigger method to use either the "last" or "double-last" method, for orders routed direct to an exchange the last price used will be the NBBO, not the last price on the specified exchange.
See the Products & Market Centers page for a listing of those Market Centers that accept native market orders, those Market Centers that accept simulated last price stop orders, and those Market Centers that accept simulated 2 price bid/offer stop orders.
For special notes and details on U.S. Futures Stop and Stop-limit orders, click here. Native stop orders sent to IDEM are only filled up to the quantity available at the exchange. Any unfilled stop order quantity will be Cancelled.
Examples
You have purchased 100 shares of XYZ for $50.00/share. You want to limit possible loss on this stock, so you create a stop order to sell 100 shares of XYZ with the stop price set to $46.00. If the price of your stock falls to $46.00 or below, your stop order is activated and a sell market order for 100 shares XYZ is transmitted.
HTH
JonnyT