A registration statement remains effective for 1 year after its effective date unless the Commissioner by rule or order extends the period of effectiveness. A registration statement is not effective while a stop order is in effect under §§ 11-511 through 11-513 of this subtitle. A registration statement may be withdrawn only in the discretion of the Commissioner. A registration statement that has not been made effective within 1 year from the date of initial filing may be deemed abandoned by the Commissioner.