Sovereign wealth funds (SWFs) are one of the most intriguing topics of 21st century in world politics and economics. As a topic (subject) of various researches, SWFs can find their place in debates about geo-economics, geopolitics, macroeconomic policy, investment policy and many other research fields. SWFs are broadly defined as a state-owned “investment-vehicles”, and starting from that point, many researchers try to examine their impact on world and national economies, as well as overall macroeconomic policies of particular governments, i.e. nationstates. Intersection between macroeconomic policies and SWFs governance is especially important (and interesting to observe) in cases of developing countries, who regularly struggle with implementation of their macroeconomic policies and their macroeconomic performances. Following the previous mentioned pattern, this research focuses on examining the effect of establishing SWFs on boosting macroeconomic performances of particular countries. Special regard in this research is given to the oil & gas export-oriented countries, who established SWFs in order to manage the volatility of their resource export revenues. Such countries (large majority of them belonging to the group of developing countries), besides the problems with governance and macroeconomic performance, have the issues related to the resource export-oriented economies, with manifestation in phenomena known in Political Economy theory as “Resource curse” and “Dutch disease” In order to support the main premise of this research, connection between establishing of SWF and macroeconomic performance’s basic indicator (GDP growth rate) will try to be established through the use of statistical analysis. Effect of establishing a SWF will be examined in statistical analysis, which will include comparison between GDP growth rates of 10 countries, who established their SWFs in or before particular time period, and 10 countries who hadn’t established their SWFs up to the end of the same time period. Time period which will be used in this statistical research is first decade of 21st century, namely, period from year 2000 to 2009. Reasons for choosing of this time period will be in details explained in introductory Chapter and Chapter related to statistical analysis. Following the statements form previous paragraph, statistical part of the research will be strictly related to oil & gas export-oriented countries, which will be included into the analysis based on the participation of their oil & gas rents in their total GDP. Besides the main objective of this research, which will be supported by corresponding statistical analysis, this Thesis will also feature an overall literature review on SWF related research questions. This research will provide an insight on findings and research debates on definition, legal framework, governance, investment decisions, impact on global financial markets and many other aspects of SWFs.