The purpose of this master thesis was to explore and develop prototypes for visualization of trade statistics in a market surveilance application. In such an anapplication a large amount of information is processed. This information is then summarized and presented to the market surveillance staff. The practical part of this thesis was done at Scila AB in Stockholm. Three prototypes were developed based on modern visualization methods. Another graph that already existed in the application was improved. The graphs were then evaluated with the help of simulated market data. Two of the graphs were also evaluated using real market data. Finally the graphs were demonstrated to market surveillance staff from an exchange in Stockholm. The conclusion was that two of the graphs have potential to be useful while the same can't be said for the other two.