When buying shares, you need to decide which company's shares you want to buy, how many shares you want and at what price.
How to buy shares in JSE-listed companies
Once you have made these decisions, you need to instruct your broker accordingly (either by telephone or online). Your broker then sends your request to the JSE, where it is entered on a central order book with all the other requests to buy or sell shares.
If the price you want to pay is matched with a seller at the same price, the JSE will ensure the transaction takes place and you will become the owner of the shares you decided to buy.