Durham was found guilty in 2012 for running a Ponzi scheme that defrauded more than 5,000 investors through his Akron, Ohio-based company, Fair Finance.
The jury found the financier guilty on all 12 counts of conspiracy to commit fraud, wire fraud and securities fraud.
Prosecutors say Tim Durham and his associates are flight risks and should be imprisoned until they're sentenced.
Tompkins says he and Durham discussed the possibility of a conviction before the actual verdict so Durham was somewhat prepared.
The courtroom portion of the trial concluded almost two weeks earlier than expected.
Federal prosecutors wrapped up their case Monday against a prominent Indianapolis businessman accused of stealing $200 million from Ohio and Indiana investors.
The jury in the Tim Durham trial may begin its deliberations by the end of the week.
Tim Durham of Fair Finance is being tried in Indianapolis on charges of embezzlement.