Xie Zhenjiang, former president of the Securities Daily newspaper and chairman of its business arm Securities Daily Media Co., has been expelled from the Communist Party for "serious disciplinary violations", respected financial magazine Caixin reported Saturday, citing anonymous sources.
The term is standard code for graft and the expulsion is the first step in a process that often ends in prosecution.
Caixin has linked the turmoil to the investigation into Xiao Jianhua, a tycoon who disappeared from his apartment at Hong Kong's luxury Four Seasons hotel.
The editorial decisions and business operations of the Securities Daily have been under the control of Xiao's company, the Beijing-based Tomorrow Group, according to Caixin.
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The financier is reportedly under investigation in connection with China's 2015 stocks crash, when the Shanghai index lost nearly 40 per cent of its value over a two-month period.
The Securities Daily, established in 2000 by state-owned newspaper Economic Daily, is one of a handful of media outlets authorised by the China Securities Regulatory Commission (CSRC) to publish mandatory public disclosures.
Shares in Securities Daily Media, which is listed on the National Equities and Exchange and Quotations, known as the New Third Board, have been suspended since early January.
"There is the possibility of an event that may have a relatively large influence on share transfer prices," the company said in a statement explaining the suspension.
Caixin said the newspaper was required to publish negative reports about rival firms, and was forced to publish positive articles about subsidiaries or affiliates of Xiao's Tomorrow Group.
It is unclear how Xiao is being linked to the 2015 crisis, but mainland investigators have since targeted several investment executives on suspicion of insider trading.
In January former star hedge-fund manager Xu Xiang was sentenced to more than five years in prison for market manipulation.