SHANGHAISINGAPORE, May 22 Reuters Chinese companies39; plans to raise capital via listings in London or Zurich are in jeopardy after Beijing mandated new disclosure rules, put curbs on the use of the funds and made issuances liable to national security reviews, bankers and lawyers said.

A total of 18 Chinese companies have already listed themselves in Zurich and London via Global Depository Receipts GDR most of them over the past year as firms looked for alternate overseas fundraising venues amid heightened SinoU.S. tensions.

More than 20 companies including drugmaker China Meheco Group 600056.SS and chemicals producer Zhejiang Yongtai Technology 002326.SZ  have unveiled plans to follow suit.

Those issues will now be clouded by the publication of new rules by the securities regulator last week requiring, among other things, that such activities must not leak state secrets, while fundraising should be rational, and not too frequent.

The new rules come against the backdrop of China39;s renewed focus on national security, which has seen authorities in the past several months cracking down on consultancies and some data firms curbing access to certain information for offshore clients.

Published by the China Securities Regulatory Commission CSRC, the new rules brought GDR issuances under China39;s regulatory framework for overseas listings, requiring national security reviews in sensitive sectors and data security compliance.

Mandy Zhu, head of China global banking at…