If your portfolio value drops below your initial margin requirement, your account will display negative buying power. This doesn’t necessarily mean that you’re in a margin call, but you do need positive buying power to buy stocks.
You can increase your buying power by depositing funds, selling stocks, or waiting for your portfolio value to rise above your initial margin requirement.
For example, if your buying power is -$50.00, depositing $100.00 will leave you with +$50.00 of buying power.
With Robinhood Gold, the amount of stock you can buy is dependent on the total value of all the stocks that you hold. In general, you’ll get more buying power if the value of your stocks is going up than if it’s falling.