Shares of ADT Inc. ADT, +0.15% fell 1.5% in the extended session Tuesday after the security company said Chief Executive Officer Tim Whall will retire on Nov. 30. Jim DeVries, currently ADT's president, will replace him. Whall will remain on the company's board and serve as an adviser, ADT said. "The board expects the transition to be seamless and efficient, and with a world-class leadership team in place we will continue to build on our efforts to grow the business in a disciplined manner," Chairman Marc Becker said in a statement. Shares of ADT ended the regular session up 2.7%.