JSE-listed chemicals company Omnia and Autumn Storm Investments will sell a majority interest in lubricants and oils supplier Umongo Petroleum to specialist chemical and food ingredients company Orkila South Africa for R1-billion Omnia, which acquired a 90% interest in Umongo in 2017, and Autumn Storm, which holds the other 10% stake in Umongo, will retain a shareholding in Umongo, subject to a two-year option agreement. Omnia will retain a 9% interest in Umongo and Autumn Storm 1%.