Is anyone here facing issues with how optionshouse calculates stock buying power and max allowed portfolio value ? Per optionshouse faq section, margin requirements are as follows: ======= The maintenance margin requirement for long stock above $5 is based on a comparison of the stock positionâs value to the absolute value of all marginable stocks in the account. This includes long and short stock. Stock position less than 25% of absolute value of portfolio: 25% Stock position 25-35% of absolute value of portfolio: 30% Stock position 35% or more of absolute value of portfolio: 40% ======= Letâs assume all my positions are long stocks above $5 and each stock position is less than 25% of my total portfolio. In this scenario, if I have $100K in my account, I should be able to have a portfolio value of upto $400k if I were to take full advantage of maintenance margin requirements. That is, 4 times the cash in my account. But, I noticed that Iâm only able to get upto around 3.17%. Anyone else noticed this ? Any help to demystify Optionhouseâs calculations in this regard would be really appreciated.