The International Chamber of Commerce (ICC) has ruled in favor of Hyundai companies seeking to buy a stake in an affiliated refiner, worth about 2.6 trillion won ($2.25 billion), from International Petroleum Investment Co (IPIC), a Hyundai firm said.

Hyundai Heavy Industries said on Monday the ruling would see Abu Dhabi-based IPIC sell its entire 70 percent stake in Hyundai Oilbank at 15,000 won apiece to Hyundai shareholders.

Shareholders related to the former Hyundai Group own a combined 30 percent stake in Hyundai Oilbank, including 19.87 percent held by Hyundai Heavy and 4.35 percent owned by Hyundai Motor.

IPIC, which invests in oil-related projects for the government of Abu Dhabi, acquired 50 percent of Hyundai Oilbank in 1999 and took another 20 percent in 2003.

A dispute began in early 2008 when Hyundai Heavy announced it would exercise an option to buy IPIC's stake, saying IPIC tried to sell part of its stake in violation of an earlier agreement.

Hyundai Heavy had requested the judgment of an arbitration body under the Singapore ICC.

It remains to be seen which (Hyundai) companies will buy those shares and how the deal will be funded, said a Hyundai Heavy spokesman, adding no timetable had been set for the Oilbank stake purchase.

Reuters could not immediately contact IPIC for comment.

A source at Hyundai Oilbank said the decision wouldn't affect crude supplies to South Korea's smallest oil refiner, with a capacity of 390,000 barrels per day.

Shares in Hyundai Heavy were up 0.3 percent by 0206 GMT, in line with the wider market .

(Reporting by Rhee So-eui and Cho Mee-young; Editing by Jonathan Hopfner)