It is usually a rough estimate as to how much money hedge funds and private equity companies actually make, but this has changed. A securities filing by Fortress Investment Group, a $26 billion investment company, provides a rare peek behind the curtain of secrecy that typically governs the world of alternative investments, according to The New York Times.

Fortress filed to sell $750 million worth of shares to the public, valuing the company at $7.5 billion, last week. The filing does not disclose individual compensation, but it does show that money management, when returns are good, is an extraordinary profitable business. And the principals will make a killing on the deal.

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