It was reported that a former employee was the culprit of the incident. 

The employee “accessed data that he would have been able to access in the normal course of his work." After illicitly obtaining some critical information, the person downloaded client files.

Supposedly, the stolen data contained:
•    addresses
•    emails 
•    telephone numbers
•    user IDs
•    bank account numbers
•    passport and ID card numbers
•    financial data.

The official representative also claimed that only professional Stock Options Plan (SOP) accounts were affected by the leak.