I'm looking for a broker where I can set a number of maximum open positions at which it cancels all other entry orders or stops executing them. As an example I might enter 50 orders to get into 50 different stocks. If 30 of those get executed I have my position limit reached and don't want to get triggered into additional positions. Therefor I'd like to see the remaining entry-orders set inactive. Anyone know a broker that does that? Looked at IB but didn't find such a feature.