One-fifth of the market has been made effectively invisible to investors, the media, and regulators. Information as basic as who actually owns a company, how it makes its money, or whether it is profitable is “disappearing indefinitely into private equity darkness,” as the Harvard Law professor John Coates writes in his book The Problem of Twelve

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The hallmark of a private-equity deal is the so-called leveraged buyout. Funds take on massive amounts of debt to buy companies, with the goal of reselling in a few years at a profit. If all of that debt becomes hard to pay back—because of, say, an economic downturn or rising interest rates—a wave of defaults could ripple through the financial

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