Exclusive: U.S. options exchanges craft rules to fend off turmoil

A year after Goldman Sachs (GS.N) bungled a software upgrade and lost tens of millions of dollars from unintended trades, the 12 U.S. Under the proposed rules, unintended trades placed by professional traders will usually have their prices adjusted to levels as close to their fair market value as possible, while wrong trades by retail customers will be mainly be undone, five sources with knowledge of the matter told Reuters. When market prices are oscillating wildly, technical glitches can create turmoil, said Andy Nybo, head of derivatives research at advisory firm TABB Group. In other markets, technical glitches have created big trouble for traders.

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