Shares in Faroe, which rejected DNO's 610 million pound hostile bid in November as inadequate and "opportunistic", have since ranged between 140 pence and 160.8 pence.

DNO's Chairman Bijan Mossavar-Rahmani said in a statement that while the company "does not overpay for assets", it was in the interest of most parties to raise its offer.

The deal will be funded from cash resources and the closing date for the final offer has been set for Jan. 23, DNO said.

DNO, which has been building up a stake in Faroe since April, said its combined ownership and bid acceptances on Jan. 4 stood at 43.8 percent. It requires 50 percent of Faroe's shareholders to back its takeover bid.

Faroe had no immediate comment after DNO raised its offer.