Sonangol yesterday informed about opening up a public tender to sell out its stakes in some private firms. The move comes as Angola's government looks to privatize key state assets by 2022. It will divest 30% interest in Petromar, Sonadiets Ltd and Sonadiets Services SA, 51% in Sonatide Marine Ltd and Sonatide Marine Angola Ltd and 40% in Sonamet Industrial SA and Sonacergy Services and Construction Petroleum Ltd.