Assuming the maintenance margin is 30%, at what price will a margin call be triggered? Assume that the price will trigger a margin call is , $15,000 − 1,000 1,000 ≤ 30% → ≥ $11.54 To verify, substitute $11,538.46 into the margin formula for shorted stock, and find that (15,000 − 11,540)/ 11,540 ≈ 30%, the margin maintenance requirement. Note that if any dividends were paid out, this must be subtracted from the account value.