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Hedge fund management firms are often owned by their portfolio managers, who are therefore entitled to any profits that the business makes. As management fees are intended to cover the firm's operating costs, performance fees (and any excess management fees) are generally distributed to the firm's owners as profits. Funds do not tend to report compensation, and so published lists of the amounts earned by top managers tend to be estimates based on factors such as the fees charged by their funds and the capital they are thought to have invested in them. Many managers have accumulated large stakes in their own funds and so top hedge fund managers can earn extraordinary amounts of money, perhaps up to $4 billion in a good year.