The SEC has up to 5 years to complete their investigation and file charges. These days, the time from suspension to civil and/or criminal charges is 2-3 years for most SEC suspensions. Since it has only been 8 months since AEGY was suspended, it is not at all surprising that charges have not yet been filed. Instead, it would be very surprising if they were filed this quickly.
The SEC is not yet done with AEGY and its cast of characters.