JPMorgan has fired senior portfolio manager Tang Jian from its joint venture in China due to an investigation by officials into his stock trades, Reuters repots. Chinese regulations bar fund managers from buying securities on their own. The investigation comes at a time when the regulators in China are cracking down on the market.

On Saturday, the China Securities Regulatory Commission said it would increase its oversight of insider trading and stock price manipulation, and sources told Reuters that the Commission issued a warning to fund houses earlier this week.

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