Last night I discussed in the group chat about running an MR system that worked the Russell 2000 excluding the S&P so it can run alongside another system that only works the S&P. Nick warned me that all the stocks in the Russell 2000 might not be marginable so here is the answer from IB:
Some of the stocks in the Russell 2000 are marginable and others are not. There is not a general rule related to that specific index.
For a list of stocks with non-standard margin requirements, please see the link below:
https://www.interactivebrokers.com/en/index.php?f=marginnew&p=stk2
I haven’t gone through the list yet but the info is there if anyone needs it