The South Africa 40 is based on South Africa’s leading stock market index. This comprises of the 40 largest South African companies by market capitalisation that are available for public trading on the Johannesburg Stock Exchange, including AngloGold, Naspers and Vodacom. As well as featuring companies originating from and headquartered in South Africa, the index also contains subsidiary stocks from multinational companies, such as British American Tobacco and BHP. Its top 10 stocks make up roughly 70% of the index, meaning that its value is heavily influenced by their performance. Start spread betting or trade CFDs on South Africa 40 - Cash.