The Open Positions keyword limits how many trades are open at once (one, or more). With a list, it controls how many stocks in the list are trading (have had an order placed).
Limitation
It only works when there is a delay between the positions of two instruments. If signals for all instruments come at the same time, the keyword will not work. In that case, the only way to limit positions is to make the list smaller.
Video with examples: https://youtu.be/5d9Uv6Ye910
To limit how many times one entry can fire (rather than how many positions are open), use a runtime variable as a counter.
Edited with AI from the original Tradetron article, checked against current docs (Oct 2026). Spot something wrong? Tell us in the Community.