The members participating in the ATHEX derivatives market are the ATHEX members, as far as concerns the execution of trades, and the ATHEXClear members as far as concerns the conducting of the clearing process of the aforementioned realized transactions.

ATHEX members according to the ability of conducting transactions in the derivatives market are distinguished to the following categories:

• Trading members, which can realize transactions on behalf of their clients or for their own account or
• Market Makers where through an Own Account the members are committed to enter quotes on one or more products that are traded in the Derivatives Market of ATHEX, aiming to reinforce the liquidity and the depth of the market.

ATHEXClear members according to the ability of conducting clearing of the transactions that have been realized in the ATHEX derivatives market are distinguished to the following categories:

• Direct Clearing Member which clears transactions (of its clients or of its own) that have been realized by the member through its attribute of being ATHEX member
• General Clearing Member which clears transactions (of its clients or of its own) that have been realized by any of the ATHEX members.