Rollback on Halo Wars trading due to manipulation

If you had traded Halo Wars (Xbox 360) yesterday, you will find that your position was rolled back. Market manipulation of coordinated buying and selling had resulted in the stock reaching very low prices and then very high prices. These violators have been fined--repeat violations will result in account suspension.

However, these rollbacks are still unfortunate for those players who were trading the stock legitimately. I am examining ways to ensure market manipulation will not ruin the investment experience for those who are honestly participating.