(a)Interest required. Prejudgment interest shall be due on any sum required to be paid pursuant to an order of disgorgement. The disgorgement order shall specify each violation that forms the basis for the disgorgement ordered; the date which, for purposes of calculating disgorgement, each such violation was deemed to have occurred; the amount to be disgorged for each such violation; and the total sum to be disgorged. Prejudgment interest shall be due from the first day of the month following each