The Bratislava Region is the wealthiest and economically most important region in Slovakia, despite being the smallest by area and having the second smallest population of the eight Slovak regions. The majority of governmental institutions, including the Ministry of Finance and the central bank, as well as many Slovak private companies and subsidiaries of multinational companies in Slovakia have their headquarters in Bratislava. More than 75% of Bratislava's population works in the service sector, mainly composed of trade, banking, IT, telecommunication industry, tourism and others. Major factories in Bratislava include the Slovnaft oil refinery and the Volkswagen Bratislava plant. The Bratislava Stock Exchange (BSSE), the organiser of the public market of securities, was founded on March