Source:
https://scmp.com/article/216816/exchange-tightens-rules-delistingExchange tightens rules on delisting
The Stock Exchange is to introduce procedures to delist long-suspended companies which have failed to produce a trading resumption proposal in 18 months.
Listing rules now require all listed companies to have sufficient business operations but certain ones have stopped operating due to financial difficulties or debt problems and their shares have been suspended.