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Why are China's companies hopping to exchanges closer to home? For one thing, compliance burdens are generally lighter outside the U.S. Yet that has always been the case. Now, however, China’s U.S.-listed companies have been tarred by the bad publicity generated by dodgy China-based businesses that have sold shares in the U.S. and elsewhere, most notably Toronto. American sentiment about China is changing, and Chinese firms have sensed the new mood. Even market darling Baidu has been hit hard, suffering a 16.2% drop in its stock price last month.