Framework Agreement with AusNet for Ultra-High Voltage Transformers & Reactors (2027–2032)

Key Management Matters Related to Investment Decisions 1. Title Execution of a Long-Term Framework Agreement for the Supply of Ultra-High Voltage Transformers, Reactors, and Other Power Equipment 2. Key Details The company has entered into a Framework Agreement with AusNet of Australia for the long-term supply of ultra-high voltage transformers, reactors, and other power equipment to major regions across Australia. — Details — 1. Counterparty: AusNet 2. Contract Value: Approximately KRW 312,049,784,079 3. Most Recent Revenue: KRW 5,968,511,616,609 4. Revenue Ratio: Approximately 5.23% 5. Supply Period: 2027–2032 (planned) 3. Board Resolution Date (Decision Date) or Date of Fact Confirmation 2026-07-01 - Outside Director Attendance: Present ( — ) / Absent ( — ) - Auditor Attendance (non-outside-director audit committee member): — 4. Other Material Matters Related to Investment Decisions - The contract value stated in Section 2 above is the KRW equivalent of AUD 291,314,050, converted at the buying/selling reference exchange rate on the contract execution date (1 AUD = KRW 1,071.18). - The 'Most Recent Revenue' in Section 2 is based on Hyosung Heavy Industries Co., Ltd.'s consolidated financial statements as of the end of fiscal year 2025. - The 'Date of Fact Confirmation' in Section 3 refers to the contract execution date. - Individual Purchase Orders (POs) will be received on a project-by-project basis as projects proceed, and each PO will be executed separately. If any future PO meets the applicable disclosure threshold, a separate public disclosure will be made in accordance with relevant regulations. - The above details may be partially modified during the course of contract execution. ※ Related Disclosures: —