HBM Inspection Equipment Supply Contract Signed with Samsung Electronics (6.11% of Revenue)

Single Sales/Supply Contract (Voluntary Disclosure) 1. Details of the Sales/Supply Contract Conclusion of a supply contract for HBM inspection equipment 2. Contract Details Conditional Contract: Not applicable Fixed Contract Amount: ₩9,720,000,000 Conditional Contract Amount: — Total Contract Amount (KRW): ₩9,720,000,000 Most Recent Revenue (KRW): ₩159,128,398,402 Ratio to Revenue (%): 6.11% 3. Counterparty Samsung Electronics Co., Ltd. - Most Recent Revenue (KRW): ₩333,605,938,000,000 - Primary Business: Memory semiconductor manufacturing and sales - Relationship with the Company: — - Track Record of Same-Type Contracts over the Past 3 Years: Applicable 4. Sales/Supply Region Korea 5. Contract Period Start Date: 2026-05-18 End Date: 2026-08-13 6. Key Contract Terms Down Payment / Advance Payment: Yes Payment Conditions: 1. Total contract amount: ₩9,720,000,000 - 90% within 30 days of delivery - 10% within 30 days of approval 2. Sequential supply through the end date 7. Sales/Supply Method In-house Production: Applicable Outsourced Production: Not applicable Other: — 8. Contract (Order Receipt) Date 2026-05-18 9. Additional Matters for Investment Reference - The most recent revenue figure above is based on 2025 consolidated financial statements. - The supply period and contract value may be revised at the customer's request. - The contract start date is the date on which the purchase order was received from the counterparty; the contract end date is the scheduled date calculated by adding 30 days (the payment period) to the final delivery date. - Partial delivery is scheduled to begin on June 1, 2026; final delivery is expected to be completed by July 12, 2026. ※ Related Disclosures: —