Pakistan says Japan's biggest trading houses are among almost two dozen companies eyeing its liquefied natural gas purchase tender that it says is the largest on record.

Mitsubishi Corp., Mitsui & Co. and Marubeni Corp., have expressed interest in the LNG order, which was announced earlier this month and has a deadline of Dec. 20, according to M. Adnan Gilani, chief operating officer at state-owned Pakistan LNG Ltd. The company is seeking bids for 60 cargoes over five years and separately 180 cargoes over 15 years, according to two tenders on its website published earlier this month.

"Most of the large traders were interested — the reception was much above expectation," Gilani said in an interview in Tokyo on Friday. "It is the largest tender that has ever been floated."