BrokerDealer.com special news update: In an effort to stem the recent plunge in prices of stocks listed on Chinese stock markets, this weekend the Shanghai and Shenzhen stock exchanges issued notices suspending initial public offerings (I.P.O.s) until further notice.

The government-controlled Securities Association of China has instructed brokerdealers from 21 of the major brokerage firms to set up a nearly US$20bil fund (120 billion renminbi) that will be used to support stock prices by buying shares in China’s largest and most stable companies.

Separately on Saturday, 25 Chinese mutual funds claimed they would also put more money into shares. Although fund managers did not reveal the exact amount, they noted that they would be investing their own funds.

Saturday’s halt to IPOs could freeze large amounts of cash and dry up liquidity in the market, thus contributing to its stabilization, as large IPOs have been named one of the main factors triggering the current decline.

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The government has already taken a number of measures over the past week, including cutting interest rates, relaxing margin-lending rules, and adding bank liquidity, so far without any success in reassuring investors.

The Asset Management Association of China pledged to halt additional stock investments for at least a year, and later to accelerate the issuance of share funds after the freeze.

The IPO freeze will last until the Shanghai composite index reaches 4,500 points, Reuters reports. On Friday, the index fell by 5.8%, ending at 3,684 points.

Saturday’s halt to IPOs could freeze large amounts of cash and dry up liquidity in the market, thus contributing to its stabilization, as large IPOs have been named one of the main factors triggering the current decline.