JOHANNESBURG :Optasia, a fintech company partly owned by Ethos Capital, said on Wednesday it planned to list on South Africa's Johannesburg Stock Exchange and raise up to 6.3 billion rand ($375 million) by selling a combination of new and existing shares. The company, which operates AI-powered financial services in 38 countries, will raise about 1.3 billion rand in an initial public offering and also hold a private placement of at least 5 billion rand for existing shareholders, it said in a