Sinokor Merchant Marine has doubled its tally of aframax tankers on order at K Shipbuilding to four.

Shipbuilding sources said the South Korean shipping company added two more 115,000-dwt newbuildings some time ago but the deal went unreported.

An executive at K Shipbuilding declined to disclose his company’s shipbuilding activities, citing contract confidentiality. Sinokor did not respond to requests for confirmation or comment.