Financial system varies broadly country to country, but there are virtually no publicly traded African companies. If you wish to invest you need to find private companies willing to take on an investor
Sure, but outside of South Africa I believe what the OP is saying is true. In any case, better to correct him than downvote him without an explanation.
I expect you would find that the biggest companies in most of Africa are either state owned mining and oil companies or western companies operating in Africa. I don't think they have many important publicly traded companies because their financial systems aren't well developed.