Surely you have some kind of description that offers more detail than you have provided so far? This is something that customers have good reason to want to understand. Normally, I can know that my well margined portfolio will still be well margined tomorrow morning, absent a large adverse market movement. If, however, the portfolio is on the verge of failing your unspecified concentration test, I could find myself undermargined and liquidated tomorrow without any change in my equity. (For example, suppose I'm long Apple and another $1 share price increase will cause it to become a concentrated position with an large but undislosed margin penalty.) I don't see any metrics on the margin report that allows me to see how close I am to failing the concentration test.