Can Interactive brokers call back margin loans even on a profitable account?

Suppose an investor's stock account with IBKR has many stocks bought on margin. The account is profitable. Is it possible that IBKR can launch a nasty surprise by calling back loans even if the account is highly profitable? Of course IBKR won't do such things. It is a good broker. But I am just thinking of worst-case scenarios just in case.

 

Short positions can have even bigger requirement increases. Some stocks that used to be 100% to short at IB were raised to 200-600% based on high volatility, and for the most part remain there even after the volatility has passed.

 

Any way to see which stocks are in that category?

 

Not sure about that, but you can check specific tickers at IB like this:

https://www.interactivebrokers.com/...g=United+States&ib_entity=llc&ln=&f=5168&ns=T

 

Thanks.