Expansion-minded Flex LNG is eyeing berth space for up to four LNG carrier newbuildings at Hyundai Heavy Industries worth at least $720m.

Market sources say the John Fredriksen-controlled company has pencilled in an order for two firm LNG carriers with an option on an additional pair of vessels. Some suggest a letter of intent on the ships has been signed, while others indicate that negotiations are at a "sensitive" stage.