Rules proposed in Congress to require the clearing of most standard derivatives through clearinghouses could prove an expensive procedure for corporations, analysts said. Corporations use over-the-counter derivatives for hedging. Germany's Siemens estimated that clearinghouse processing would cost an extra $1 billion in cash reserve, and the U.K.'s Rolls Royce calculated that it would need $4 billion. "It's causing treasurers to lose sleep," said Tim Sangston, managing director of Greenwich Associates.
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