SKC said on Wednesday it posted 2025 fourth-quarter revenue of 428.3 billion won and an operating loss of 107.6 billion won. Revenue rose 0.8 percent from a year earlier, while the operating loss widened 30.8 percent.

The fourth-quarter loss was due to one-off costs stemming from asset restructuring. The company said one-off costs of 316.6 billion won were reflected, including impairments of tangible assets to improve process efficiency in its battery and chemical businesses. It said pre-emptive asset restructuring is expected to reduce the burden of fixed costs going forward.

For the full year 2025, it posted revenue of 1.84 trillion won and an operating loss of 305.0 billion won. Revenue increased 6.9 percent from a year earlier. The battery materials business was driven by expansion in the North American market. Sales volume of copper foil for ESS, or energy storage systems, surged 133 percent from a year earlier, emerging as a new growth engine. Copper foil sales volume for electric vehicles also rose 61 percent as key customers expanded U.S. plant capacity.

The semiconductor materials business achieved its highest annual results. It was due to increased demand for high value-added products for AI data centers. Fourth-quarter operating profit rose 25.9 percent from the previous quarter, maintaining a high-growth trend.

Its glass substrate business under way at its factory in Georgia in the United States is also progressing smoothly. The company said it received positive feedback from customers during prototype evaluations.

SKC also secured 893.3 billion won in cash over the year through the issuance of perpetual exchangeable bonds and by liquidating assets in non-core businesses. It plans to strengthen financial capacity and liquidity management until it returns to profit and its glass substrate business becomes established.

An SKC official said, "Along with managing short-term performance, we will closely examine the overall business structure and the cost and expense structure from a more fundamental perspective," adding, "We will do our best to build a foundation for sustainable growth so we can continue our mid- to long-term growth story."