SGX Logo. Reuters

Companies such as Global Yellow Pages, Interra Resources and Informatics Education will become part of the Singapore Exchange's watchlist from December 5.

SGX introduced a watch-list for companies listed on mainboard in 2008.

Quarterly reviews are carried out on issuers to determine if they meet the minimum continuing criteria.

This is part of SGX's ongoing efforts to improve the overall quality of listed companies in Singapore, and promote investor confidence of the marketplace.

Companies may be removed from the watchlist if they record consolidated pre-tax profit for the most recently completed financial year, and post an average daily market capitalisation of at least S$40 million over the last six months.

ISR Capital has also been put on the watchlist for failing to meet the minimum trading price entry criterion. The companies may be removed from the watchlist if their share prices reach a volume-weighted average price of at least S$0.20, and they meet the market capitalisation requirement.