China's stock-market regulators have aimed a fresh blow at accounting firms and companies giving false data to investors in a stepped-up campaign to stamp out market fraud. State media said the Ministry of Finance had punished 13 more accounting firms and 21 accountants for collaborating with firms to give false financial reports. The toughest punishment was meted out to Suizhou Chengxin Accounting. The firm has been barred from auditing work for one financial year, according to a China Securities News report. The ministry had uncovered 'serious irregularities' during routine reviews of last year's financial reports, the paper said. The same newspaper also said the China Securities Regulatory Commission (CSRC), the stock-market watchdog, would implement new supervisory procedures next month to ensure the reliability of corporate disclosure. 'The markets are definitely filled with irregularities, and the government is not happy about that,' said Li Shiming, an analyst at Galaxy Securities. He said the increasing attention paid to regulating the domestic stock markets was also linked to China's imminent entry into the World Trade Organisation, which would open up the economy and demand higher levels of regulatory supervision. Yesterday's announcement was the latest in an intensifying enforcement effort by Beijing after a spate of stock-market irregularities. The abuses included price-rigging by fund managers, embezzlement of funds by executives in listed companies and banks illegally pumping money into the stock markets. Regulators publicly warned 12 other accounting firms - Guangzhou Hua Du, Long Yan Xing Chen, Xiamen Zhongrui, Henan Chengyan, Yantai Xingxin, Henan Chengyi, Sichuan Shuwei, Kunming Huakun, Guiyang Xinhua, Jiangsu Tianxiang, Suifenhe Guangxin and Shanxi Lixin. At the same time, 13 of the accountants at these firms were issued warnings and other unspecified punishments, while eight were suspended from their duties for one month to one year. In addition, the ministry singled out 16 companies, including a listed firm Shenyang Dawn Garments, for giving the public false information. Shenyang Dawn's general manager and chief accountant were sacked. Executives of the other unlisted companies were also punished but no details were available. Sanjiu Medical was censured by the CSRC this week after its controlling shareholder and associates were found to have siphoned off more than 2.5 billion yuan (about HK$2.34 billion) from the firm's intial public offering proceeds. The CSRC has also launched investigations into Guangxia (Yinchuan) Industry, once considered a 'blue chip' company, and Macat Optics for allegedly inflating earnings figures. The probes have dealt a heavy blow to confidence among stock-market investors, sending the domestic A-share index tumbling in the recent weeks. Last week, Beijing publicly denounced Hubei Lihua Accounting Firm for helping companies fabricate data. Five accountants from the firm were suspended for three to six months.