But what is a margin call, exactly? How does it work? And how do you avoid it? So, what is a margin call? A margin call is triggered when the value of an investor's margin account drops to a broker-set minimum. In other words, when you borrow money from a brokerage firm to finance investments in assets such as stocks, options, and commodities, you must keep a certain portion of the ... https://finxl.in/equity-research-online-classes-courses-training.html