Won 15.5 billion KRW piping construction contract for Pyeongtaek P5 Ph1 Green Building (7.77% of sales)

Contract amount of 15.53 billion KRW (excl. VAT), representing 7.77% of 2025 consolidated sales (199.9 billion KRW)
Counterparty is Samsung E&A Co., Ltd. (plant construction, industrial machinery, etc.). No relationship with the company
Contract period: 2026-02-20 to 2027-05-31 (approximately 15 months)
This is an amendment to an existing contract, disclosed due to an increase in contract amount
No advance or down payment required
In-house production and outsourcing combined

Filing: Notification of Single Sales and Supply Agreement (Voluntary Disclosure)
Company: HANSUNG CLEANTECH (066980)
Submission: HANSUNG CLEANTECH CO., LTD.
Receipt: 05-18-2026
Under KRX KOSDAQ Market Division