Supplementary Material for the Consolidated Financial Report for the Six Months Ended December 31, 2025

DISCLAIMER : This document has been translated from the Japanese original for reference purposes only.

In the event of any discrepancy between this translated document and the Japanese original, the original shall prevail.

For the third quarter of the fiscal year ending March 2026, consolidated ordinary income increased by 6,200 million yen compared to the same period last year, resulting in an ordinary profit of 800 million yen.

This improvement was mainly, in the Coke business, driven by increased production and sales volumes due to the operation of the 2A coke oven batteries (starting September 2024) and reduced manufacturing costs resulting from the transition to operations centered on the sound coke oven batteries that are not deteriorated.

Decreased sales volume etc.

Nine months ended

December 31, 2024

Ordinary Loss

(Millions of Yen)

Comprehensive

Engineering Business Other Business

Non-operating

Income

Nine months ended

December 31, 2025

Ordinary Profit

Gains from subsidy etc.

• Market conditions and exchange rates +600

• Reduced processing costs +4,800

• Other +400

Improvement by 6,200 million yen

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