PetroChina, the country's largest oil and gas company, yesterday announced it will make a long-awaited A-share offering in Shanghai - the latest among overseas-listed Chinese companies to "return home".

The company stated on its corporate website that it plans to issue 4 billion shares to domestic investors. The offer is subject to approval by shareholders and the market regulator.

The move could raise up to HK$47 billion ($6 billion), based on its record closing price of HK$11.74 in Hong Kong yesterday.

Related readings: QDII expanded to include securities, fund companies Chinese securities and fund-management firms will be allowed to invest overseas in a move seen as cooling the overheated mainland stock market. Discoveries boost oil firm stocks Largest gasfield discovery may be declared soon Nanpu output to hit 2.2m tons PetroChina output climbs PetroChina energy consumption down 18% PetroChina releases CSR report

PetroChina's turnover was 689 billion yuan ($90 billion) in 2006, the same as Beijing's gross domestic product in 2005.

The company said it will use the proceeds from the issue for development of its "domestic petroleum and gas resources", construction of large-scale refinery, petrochemical and gas pipeline projects, and "acquisition of overseas petroleum and gas resources".

The company did not indicate the offer price but analysts believe it will be higher than the traded price of H shares in Hong Kong and other markets around the world.

Han Xiaoping, an independent energy analyst with Beijing Falcon Pioneer Technology Co Ltd, said a higher A-share price will boost its H-share performance.

Based on the domestic market strength, he said, "there will be hardly any doubt that the company will set the A-share price at a higher level than its H share".

In early May, PetroChina said it planned to spend 40 billion yuan ($5.2 billion) in the following three years on its new Jidong Oilfield in eastern Hebei Province, China's largest oil discovery in four decades.

Zheng Weigang, at Shanghai Securities, said Petro-China's domestic listing will play a significant role in stabilizing the highly volatile domestic capital market.

The move suggests the market watchdog is pinning high hopes on blue-chip companies to boost the quality of mainland bourses and deflate potential bubbles in the market.

In another development, sources at CNOOC, the offshore oil and gas exploration giant, told China Daily yesterday that the preparation for the issue of the company's A-shares is "right on track".

Last week, overseas-listed China Construction Bank and top shipper China COSCO also unveiled domestic listing plans.