Chinese stock futures dive ahead of the open

IK KIL CENOTE, MEXICO – OCTOBER 18: (EDITORIAL USE ONLY) In this handout image provided by Red Bull, Jonathan Paredes of Mexico dives from the 27 metre platform during the seventh and final stop of the Red Bull Cliff Diving World Series, Ik Kil cenote, Yucatan, Mexico. (Photo by Romina Amato/Red Bull via Getty Images)

It could be another bad day for Chinese stock investors.

Futures for the CSI 300 index, which comprises the 300 largest listed firms on the Shanghai and Shenzhen stock exchanges, has plummeted 6.7% upon the resumption of trade on Wednesday.

The index has fallen 27% over the past 19 trading sessions. Over the past year it has gained 81%.

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