An Overview of Hedge Funds and Structured Products : Issues in Leverage and Risk The size of the hedge fund sector using IOSCO sources and results from responses to an OECD Questionnaire on Hedge Funds is around USD 1.4 trillion in assets under management (AUM). While this does not seem that large compared to total global AUM the hedge fund share of trading turnover (augmented by leverage and investment style) is much greater than its share of global AUM....