When you purchase on margin (using borrowed funds from TradeUP Securities, Inc. to purchase more stocks), you agree to use the existing securities in your account as the collateral.
If the outstanding margin call or maintenance call was not met by depositing new funds into the account, then TradeUP Securities, Inc. will force liquidate your positions to cover the call.
Still got questions? Contact TradeUP Customer Support by email at support@tradeup.com or reach out to us on Live Chat!