Yes, it’s important you understand when trading some securities or trading in certain situations, there’s a potential for an increased margin-call risk. Specifically:
Trading low-priced stocks
Trading volatile stocks (e.g., leverages ETFs, IPOs, or options)
Trading securities in advance of corporate earnings announcements or corporate actions
Some low-priced securities may not be marginable or if they can be, they might have higher requirements, which means your full intraday buying power balance might not be available. Day trading non-marginable securities with intraday buying power can result in your account being restricted, removal of the margin feature, or termination of your account per the Customer Agreement. The intraday buying power balance is typically used for fully marginable securities in ordinary market conditions. Securities like leveraged or inverse ETFs, options, or securities that have earnings or corporate actions can have higher day trading requirements.
Keep in mind that using features such as checkwriting, bank cards, and bill payment services can create a margin loan or increase the amount outstanding of an existing margin loan and may increase the risk of a margin call.
You can find more details under Trading Restrictions, Day trading.