BEIJING - China's top securities regulator tightened the supervision of listed companies by barring them from using certain funds to make up for losses from mergers and acquisitions, the Chinese Securities Regulatory Commission said on Friday.

The measure requires public companies to follow the corporate law that forbids using the capital accumulation fund to cover losses from the mergers and acquisitions. In addition, listed businesses must report irrecoverable losses and potential risks to the investors, the CSRC said.

"The move is a new attempt to issue supervision guidelines for market players that can increase their transparency and improve the risk-alert system for investors," a CSRC official said on Friday.

After completing mergers and acquisitions, 33 companies listed on the Chinese market suffered big losses, the CSRC said.

This year, the watchdog has accelerated the reform of regulations on the disclosure of risks so ordinary investors have the information to make rational decisions and reduce losses.

The commission also redesigned the online information platform for securities investment funds. A new system installed in March allows investors to search all published information about more than 950 funds on the CSRC website.

The restructured system has added access to reports about fund dividends that may cause fluctuations in the funds' net value.

"We will further improve the market-based registration system of funds, which will rely much more on a convenient information publishing platform," a CSRC official said.

The reporter can be reached at chenjia1@chinadaily.com.cn