Major Shareholder Hana Micron Reports 5,000-Share Reduction by Related Party — Hana Materials

Summary

Hana Micron, the largest shareholder of Hana Materials, filed an amended large-holding report following a small on-market sale by a related party. Total holdings decreased by 5,000 shares, lowering the combined ownership stake from 44.87% to 44.84% (a 0.03 percentage point decline). The reporting entity and its seven specially related parties (executives and affiliates) collectively still hold 8,957,208 shares. The change was driven by an on-market sale by a specially related party, with the purpose maintained as 'influence over management.' Major contract-related holdings remain unchanged at 4,924,241 shares (24.66%).

Historical Impact

10 past Large Holding Report (5%+) · ≈ Schedule 13D/G events at Hana Materials

Median +5d

+2.36%

Range

-6.03% to +8.53%

Positive outcomes

6/10

Filed	P₀	P₊₅	+5d
Jun 23, 2026	₩60,900	₩63,300	+3.94%
Jun 1, 2026	₩60,400	₩63,800

Full Translation

Report on Mass Holdings of Stocks, Etc. (General) Hana Materials Co., Ltd. Report on Mass Holdings of Stocks, Etc. (General Format: For reports under Article 147 of the Financial Investment Services and Capital Markets Act with 'purpose of influencing management control') To: Financial Services Commission Date of Reporting Obligation: May 22, 2026 To: Korea Exchange Report Preparation Date: May 29, 2026 Reporter: Hana Micron Co., Ltd. [SUMMARY INFORMATION] Issuing Company: Hana Materials Co., Ltd. Relationship with Issuer: Largest Shareholder Report Type: Change Number and Ratio of Shares Held: - Previous Report: 8,962,208 shares (44.87%) - This Report: 8,957,208 shares (44.84%) Shares/Ratio Under Major Contracts: - Previous Report: 4,924,241 shares (24.66%) - This Report: 4,924,241 shares (24.66%) Voting Rights: N/A Reason for Report: Change in shares owned by specially related party (on-market sale) * The issuer has not issued multiple voting right shares as of the reporting date. Part 1: Report Overview 1. Information on Issuing Company - Company Name: Hana Materials Co., Ltd. - Company Code: 166090 - Corporate Classification: KOSDAQ-listed corporation - Total Issued Voting Shares: 19,777,674 2. Information on Major Shareholder A. Reporter - Report Type: Change - Reporter Classification: Domestic Corporation - Nationality: Republic of Korea - Name: Hana Micron Co., Ltd. (HANA Micron, Inc.) - Head Office: Eumbong-myeon, Asan-si, Chungcheongnam-do - Business Registration No.: 312-81-50630 - Business: Semiconductor manufacturing - Relationship with Issuer: Largest Shareholder - Contact: Finance Group, Kim Jae-wook (Senior) Reporter Details (Corporation): - Legal Form: Corporation (Stock Company) - Total Assets: KRW 2,017,838,854,218 - Total Liabilities: KRW 1,365,163,250,751 - Total Equity: KRW 652,675,603,467 - Capital Stock: KRW 33,189,075,500 - Representative: Lee Dong-cheol - Decision-Making Body: Board of Directors - Largest Shareholder: Choi Chang-ho - Largest Shareholder's Stake: 15.15% * Financial figures based on 2025 year-end IFRS consolidated financial statements. B. Specially Related Parties 1. Choi Han-su (1979.12.08) - Affiliate executive, President of Hana Materials, Major Shareholder 2. Choi Wang-gi (1969.03.01) - Affiliate executive, Vice President of Hana Materials, Registered Officer 3. Kang Dong-ho (1972.02.12) - Affiliate executive, Executive Director of Hana Materials, Registered Officer 4. Yang Do-hwan (1969.08.28) - Affiliate executive, Executive Director of Hana Materials, Unregistered Officer 5. Ryu Heung-seon (1966.12.07) - Affiliate executive, Managing Director of Hana WLS, Unregistered Officer 6. Kim Young-seok (1971.09.05) - Affiliate executive, Executive Director of Hana Materials, Unregistered Officer 7. Kim Hyun-ju (1965.06.12) - Affiliate executive, CEO of Hana Materials, Registered Officer C. Collective Investment Business Operator: Not applicable 3. Number and Ratio of Shares Held - Previous Report (2026.05.19): Reporter + 7 related parties, 8,962,208 shares of stock (44.87%), 8,767,208 common shares (44.33%) - This Report (2026.05.29): Reporter + 7 related parties, 8,957,208 shares of stock (44.84%), 8,762,208 common shares (44.30%) - Change: -5,000 shares (-0.03%) - Total issued voting shares: 19,777,674 4. Holding Purpose: Influence over Management Control The reporter exercises de facto influence as the largest shareholder over matters including: (I) appointment/dismissal of directors and auditors; (II) amendment of articles of association regarding company organs; (III) changes to capital stock; (IV) dividend decisions; (V) mergers (including simplified/small-scale) and divisions; (VI) comprehensive stock swaps and transfers; (VII) transfer/acquisition of all or major business operations; (VIII) disposal/transfer of all or major assets; (IX) lease, management entrustment, or profit-sharing contracts; (X) company dissolution. Currently, there are no specific plans regarding items I-X, but as the largest shareholder, the company will make decisions in accordance with management objectives when such matters arise. 5. Reason for Change - Method of Change: On-market sale by specially related party - Reason for Change: Change in shares owned by specially related party (on-market sale) Part 2: Mass Holdings Details 1. Holdings by Reporter and Specially Related Parties A. Holdings by Type of Stock - Hana Micron Co., Ltd. (Reporter): 6,428,508 common shares (32.18%) - Choi Han-su: 2,300,000 common shares (11.51%) - Choi Wang-gi: 33,700 common shares (0.17%) - Kang Dong-ho: 40,000 other (0.20%) - Yang Do-hwan: 20,000 other (0.10%) - Ryu Heung-seon: 20,000 other (0.10%) - Kim Young-seok: 15,000 other (0.08%) - Kim Hyun-ju: 100,000 other (0.50%) Total: 8,957,208 shares (44.84%) Total Issued Voting Shares: 19,777,674 Potential Shares Held: 195,000