China’s biggest brokerage, Citic Securities Co., over-reported equity-swap data by 1 trillion yuan ($157 billion) between April and September, the Securities Association of China said.

In a statement, the association is probing and will take measures if it discovers any non-compliant situation.

Citic Securities shares plunged 0.8% in Hong Kong as of 9:49 a.m. local time, compared with a 0.6% drop in the benchmark Hang Seng Index.

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