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S-Oil, South Korea's oil company, reports a Q4 profit surge and says that Q1 refining profits will remain robust

S-Oil, a South Korean oil company, announced on Monday that it had recorded a 91% increase in its fourth-quarter operating profits. It expects the first-quarter refinery margins to be robust due to the steady demand and disruptions of supply as well as a planned U.S. refining plant closure.

According to market expectations, the refinery, which is owned 63% by Saudi Aramco reported an operating profit for the quarter of 424 billion won ($293 millions). The operating profit of its refining division increased by 55%, to 225.3 billion won.

It said that the refining margin of gasoline from Dubai crude had risen to $13.4 dollars a barrel in 'the final quarter 2025. This is compared to $6 dollars a barrel a year ago.

S-Oil ran its crude distillation units at its 669,000 barrels-per-day oil refinery, located in the city of Ulsan (southeast Korea), at 95% capacity from October to December. The rate was 96% in 2025.

S-Oil has announced that it will close its No. S-Oil said it plans to shut down its No. 2 RFCC by 2026 to perform scheduled maintenance.

Analysts say that the recent drone strikes by Ukraine on Russia, and the sanctions imposed by the European Union on Russia, have restricted Russia's petroleum supply. This has contributed to a high refining margin. Analysts predicted that continued sanctions from the EU by 2026, and Ukraine's attacks on processing facilities would sustain a strong refining profit margin.

Analysts predict that the recent crises in Venezuela and Iran will also affect the competitiveness of China's processing plants, which import crude oil at low prices from these nations.

Valero Energy Corporation has previously stated that its unit plans to close the refining operations at its Benicia Refinery in California, U.S.A. by April 2026.

The company stated that S-Oil’s $7 billion project, named Shaheen to build a large production complex of petrochemicals in Ulsan in South Korea, will be mechanically completed in the first half 2026.

The project is aimed at producing up to 3.2 millions metric tons of petrochemicals per year from crude oil.

(source: Reuters)