The Hang Seng China Enterprises Index tracking some of the nation’s biggest companies tumbled from an advance of 1 percent to a loss of 1.5 percent in about two minutes, before rebounding to a gain. Stocks including Tsingtao Brewery Co. and PetroChina Co. fell sharply at 2:14 p.m. in Hong Kong before paring losses. The same shares in Shanghai didn’t replicate the move.

“Everyone is trying to figure it out,” said Jackson Wong, associate director at Huarong International Securities Ltd. in Hong Kong. “We have been trading on low volume without any major news, so there may have been something that triggered some bigger funds to sell a certain position or using futures to hedge and that triggered the domino effect for that moment. But that’s only my speculation.”

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