Maiman acquired the Ampal-American Israel Corporation from Beny Steinmetz for US$174 million in 2002. He served as its chairman from 2002 to 2013, and as its president and chief executive officer from 2006 to 2013. According to "Globes", Maiman stepped down as a result of losses incurred in the wake of the Egyptian revolution of 2011, when contracts for the distribution of gas between Egypt and Israel fell through.