This Handbook contains surveys of state-of-the-art concepts, systems, applications, best practices as well as contemporary research in the intersection between IT and finance. Included are recent trends and challenges, IT systems and architectures in finance, essential developments and case studies on management information systems, service oriented architecture modelling, IT architectures for securities trading, IT-systems in banking, process-oriented systems in corporate treasuries, grid computing and networking. The IT applications in banking, trading and insurance cover risk management and controlling, financial portals, electronic payment and others. In addition, also finance-related IT applications in non-financial companies are considered. The concept-oriented part of the book focuses on IT methods in finance like financial models and modelling financial data, planning and processes, security, algorithms and complexity.