Cross-Margin
Cross-margin is a system where the collateral from all positions in a trader's account is aggregated to satisfy margin requirements. This allows profits from one position to offset losses from another, potentially preventing liquidation.
It provides more flexibility for traders managing a portfolio of derivatives. However, it also means that a loss in one position can threaten the entire account's equity.
If the total portfolio value falls below the maintenance margin, all positions are at risk of liquidation. This system requires a more sophisticated margin engine to monitor the combined risk of all holdings.
It is popular among experienced traders who want to optimize their capital usage. It is a more efficient but potentially riskier way to manage margin.