How to Go Broke Buying Low, Selling High on Chinese Markets

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Betting that identical stocks will trade at similar prices in China and Hong Kong is proving a great way to lose money.

The mainland premium on dual-listed shares has surged to an average 113 percent from 30 percent a year ago, burning anyone who sold short China’s high-priced stocks to fund the purchase of cheaper equities in Hong Kong. Valuation gaps reached the widest since 2009 on Wednesday, according to a Hang Seng index that gives greater weight to the biggest companies.