You have to be able to trade at OSE (Oslo stock exchange). The company is only listed there. I know that Birdstep is having a roadshow directed at american investors in May. There are som americans trading Birdstep through MSI (Morgan Stanley) and also LBI (lehman brothers) . I don`t have a complete list over the american companies that can trade on OSE, but there several international companies trading at OSE. Since I`m trading through a Norwegian brooker i don`t know exactly what you should do, but LBI and MSI have been trading at OSE and in Birdstep. The ticker code is BIRD, by the way.