 AIOC initially consisted of 11 companies (BP, Amoco, Unocal, LUKoil, Statoil, Exxon, TPAO, Pennzoil, McDermott, Ramco, Delta Nimir) representing 6 countries (UK, USA, Russia, Norway, Turkey and Saudi Arabia).The biggest single shareholder is BP.SOCAR and co-venturers (BP, Chevron, INPEX, Statoil, ExxonMobil, TP, ITOCHU and ONGC Videsh) signed amended and restated Azeri-Chirag-Deepwater Gunashli Production Sharing Agreement (PSA) on September 14, 2017 and extended the development of this field until 2050.