In Sweden, savings in funds today is one of the most popular forms of savings. Through both active and passive choices, almost all Swedes are exposed to the fund market, where mutual funds are the most popular type of funds. A clear majority of these funds are actively managed, which means that one or more fund managers actively work with the investments of the funds, with the aim to outperform the market. This method of management has been hotly debated in recent years, when many scientists claim that fund managers generally fail to outperform the market in long term. At the same time, interest in sustainability investments has increased in recent years, which is reflected in the fund market where sustainability funds have become increasingly popular. This essay therefore focuses on these sustainability funds, with focus on comparing large banks with web-based fund companies. The large banks in Sweden have been criticized for the way they are working seen from a customer perspective, but their funds are still very popular. Against this background, the study aims to investigate whether one can find any differences in performance of actively managed sustainability funds between large banks and web-based fund companies. Using four different models to measure risk-adjusted return of security portfolios, the funds have been examined to see if it is possible to find any patterns in terms of performance and the type of company that manages the funds. The survey results show that there is a clear difference in performance between the large banks and the web-based fund companies, whereby the latter succeed much better. Of the four models used, the large banks do not outperform the market under one model, while the web-based companies manage to outperform the market according to three of the models. Thus it can be stated that if you are interested in saving money in actively managed sustainability funds, it is the web-based companies to turn to. As previously mentioned, the large banks funds are very popular, which means that Swedish private investors have much money to gain by allowing web-based companies to manage their money, rather than large banks.