If you had bought stock in Cochlear Limited at the turn of the century, five years after Cochlear Limited was first listed on the stock exchange, that stock would be worth six times that amount today. Cochlear Limited is the biggest of the three companies that dominate the implant market. Based in Australia, Cochlear does most of its business in Europe and the US through more than a dozen subsidiaries. More than a quarter of a million people have one of its implants. It employs more than 2700 people in 25 countries.