After a recent press conference by China's National Development and Reform Commission yielded little in the way of new economic measures, Goldman Sachs recorded the largest single-day net selling of Chinese securities, according to a report by MarketWatch.

The report cites analysis by the bank's prime brokerage division as highlighting that the net sales of Chinese stocks were the highest ver seen in a single day.

According to a Goldman Sachs report, the net selling was 1.4 times greater than the previous record, with three-quarters of the sales coming in A-class shares after the Chinese stock market reopened following a weeklong state holiday. The remaining sales occurred in Hong Kong-listed shares, while activity in US-listed Chinese companies was "muted," the report said.

As well as ditching their long bets, hedge funds also initiated new short positions.

The Shanghai Composite Index CN:SHCOMP tumbled nearly 7% on Wednesday, though the index is still up 20% over the last month. Hong Kong's Hang Seng Index, meanwhile, ended 1% lower but is still up 21% over the last month.