Margin is the amount of money that is required by the company to hold a position. Margin requirements are set by the exchange and differ by product.
As a company administrator, you can configure margin limits per company for each product and product type, with the exception of inter-product spreads/strategies that have legs in more than one product or product type. For those, margin is only calculated for each outright product and not for the entire spread.
Note: A percentage of the product margin can be applied per product when setting pre-trade risk limits for an account.
The risk manager (company administrator in TT) can also upload product margin CSV files based on exchange requirements.
To configure margin limits per company, use the Company Settings | Product Margin tab in the left navigation pane.