RH Petrogas and Unified Communications Holdings were granted a 12-month extension to improve their financial performance and exit the stock exchange’s watch-list, while six others were added, reported Bloomberg.

The two given an extension either posted a pretax profit or now have a minimum market value of $40 million, Singapore Exchange said in an e-mailed statement today.

The operator of the city-state’s securities and derivatives markets created a watch-list to improve transparency in December 2007, placing on it companies that failed to meet certain criteria such as profitability.

The six added to the list were Creative Master Bermuda, AEM Holdings, Sinobest Technology Holdings, Lankom Electronics, JEL Corporations Holdings and Plastoform Holdings, Singapore Exchange said.

Six companies on the watch-list were today served notifications of delisting. They were ASA Group Holdings, Chinasing Investment Holdings, Chuan Soon Huat Industrial Group, Fastech Synergy, General Magnetics and Ionics EMS, according to the statement.