Alibaba Group Holding Ltd. has restructured its seven business groups, turning them into 25 business units in the second such change it has made in six months. The previous change came in July 2012, when the company made its six subsidiaries into seven business groups, a step meant to strengthen its control over its various business arms. The latest restructuring, which has further divided its business into smaller units, is aimed at making the company's organization more agile in the age. Nine executives will oversee the 25 new business units, up from the seven people who have had similar responsibilities since July 2012.