In a new report, Fitch Ratings says Islamic finance is a mature and developed industry in Saudi Arabia, representing about two-thirds of total bank financing. About 38% comes from Islamic banks and 28% from the Islamic windows of conventional banks. Due to the largely Islamic finance nature of the lending market in Saudi Arabia, the performance and credit matrices of both Islamic and conventional banks are to a large extent similar. All banks are subject to a single supervisory authority and the same disclosure requirements. The Saudi Arabian Monetary Agency (SAMA) regulates sharia-compliant banks in the same way as it regulates conventional banks. However, one of the key differences between conventional and Islamic banks is the structure of their liquidity/investment portfolios.