"The Zhejiang Securities Regulatory Bureau has not, and is not doing any investigation on Zhejiang Dadi Futures Co," an official at the bureau told Reuters by telephone.
"That is a rumour. It's not true."
Shanghai rubber futures
On Friday Shanghai rubber extended losses by 0.7 percent to close at 25,265 yuan per tonne. On the week, the market ended 3.7 percent lower, its biggest weekly fall since early June.
China Zhejiang Dadi Futures Co said on Thursday it had received no notification from regulators or exchanges about any probe into its activities in commodities futures.
"Our company is operating as normal, and has not received any written or oral notification on an investigation in the company's commodities futures trading from the regulator or exchange," said Zhejiang Dadi in a statement on its website on Thursday (www.ddqh.com).