In Alpha's 2008 Hedge Fund 100, we provide each manager’s total assets under management as of December 31, 2007, unless otherwise indicated. Where possible, we also show assets at the individual fund level, with 2007 net returns through year-end, for the five biggest funds run by a firm. Asset totals reflect internally run, single-manager hedge funds and separate accounts; they exclude funds of funds, overlay accounts, funds managed by third parties, mutual funds and traditional long-only money, dynamic money market funds, assets in collateralized debt and bond obligations, private equity and venture capital, and assets in private-equity-style vehicles that issue capital calls. We gathered data through questionnaires completed by hedge fund managers and supplemented by extensive staff research.