STX Offshore & Shipbuilding of South Korea has inked an order for 50,000-dwt tanker quartet, totalling around KRW 160bn ($135.4m) from US owner Alterna on June 2.
Alterna has decided to exercise an existing option from an order contracted for two same-size ships in the end of April 2012.
Four newbuildings will be constructed at Jinhae yard with delivery by Q2 2013.
STX have contracted overall 23 tankers, totalling $830m and eight liquefied gas carriers, $560m in total, year to date.
Also, including the recent order, STX have recorded tally of 47 newbuildings, totalling $2.5bn, year to date.
Besides, having 59 vessels, $6.9bn of newbuildings, which have been signed letter of intent or under optional contract, STX is expected to bag additional orders, later on.