IBKR's exposure fee

That damn fee starts small but goes parabolic if you start to push positions up I hate it

 

Don't think it's about position sizing as much as SPX beta of the portfolio and what happens in big down market moves. I do up to 400% net long with many >30% of equity positions but my portfolio beta is ~1 to SPX and I don't do too many short OTM puts. Concentration margin gets me all the time.

 

Nice performance