This IB text is a bit ambiguous. It does not specify whether the last trade price, bid price, or ask price, has attained or penetrated the set stop price.As per IB's TWS user guide,
Hope this helps.
- "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."
This IB text is a bit ambiguous. It does not specify whether the last trade price, bid price, or ask price, has attained or penetrated the set stop price.
I believe that the default setting is that the last trade price must have reached the stop price. But that it is possible to change this default to using the bid or ask price.