New issues have already attracted considerable interest from investors during the offer period. Six companies that completed the IPO process on Monday collectively raised 563.9 billion yuan ($91 billion), which is more than two times the volume attracted by the first seven companies which conducted IPOs in January.

The average lot-winning rates for online and offline biddings are 0.79 percent and 0.24 percent respectively, according to the CSRC.

The benchmark Shanghai Composite Index dropped 0.41 percent to 2,025.50 at close on Wednesday, and turnover shrank to 56 billion yuan from 61.7 billion yuan on Tuesday.

The Shanghai Composite Index has dropped 4.3 percent year-to-date on concerns that the new issues would drain market liquidity further, the biggest fall among 46 emerging and developed countries, according to Bloomberg. On the other hand, Chinese IPOs have jumped an average 43 percent in their trading debuts this year, the most worldwide.

"The extremely low winning-rates may guide most of the locked-up capital back to the secondary market, which benefits liquidity and will boost the stock market performance temporarily. However, as long as investors remain interested in new offerings, the stock market is likely to remain depressed," said Zhu Junchun, an analyst with Great Wall Securities.

More than 600 companies have submitted IPO applications and more than 400 have published their draft prospectuses, the CSRC said in a statement in May.

The CSRC plans to allow about 100 IPOs from June to the end of the year and the stock sales will be evenly spread over time, CSRC Chairman Xiao Gang said in a statement recently.

Driving school steers toward a Shanghai IPO	Stocks dip, foreign investment slows