Largest Shareholder Files Amended Large Shareholding Report on Stock Pledge Loan Change — Hana Materials

Summary

Hana Micron Inc., the largest shareholder of Hana Materials, filed an amended large shareholding report triggered by a modification to its stock-backed loan agreement. Total shares held remain unchanged at 8,962,208 shares (44.87% of voting shares). The material change is a reduction in shares subject to the major contract (pledged shares) from 5,091,254 (25.49%) to 4,924,241 (24.66%), a decrease of 167,013 shares. This likely reflects a partial reduction in collateral scope, possibly due to partial loan repayment or restructured pledge terms. There is no change in overall shareholding or corporate governance posture.

Historical Impact

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

Median +5d

-0.66%

Range

-7.97% to +8.53%

Positive outcomes

5/10

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

Full Translation

Large Shareholding Report (General) Version: 6.0 Issuing Company: Hana Materials Co., Ltd. Large Shareholding Report (General Format: For reports under Article 147 of the Financial Investment Services and Capital Markets Act where the purpose is 'to influence management control') To: Financial Services Commission Obligation Trigger Date: May 18, 2026 To: Korea Exchange Report Preparation Date: May 19, 2026 Reporter: Hana Micron Co., Ltd. --- SUMMARY INFORMATION --- Issuing Company Name: Hana Materials Co., Ltd. Relationship with Issuing Company: Largest Shareholder Report Type: Amendment Number and Ratio of Shares Held: Previous Report: 8,962,208 shares / 44.87% This Report: 8,962,208 shares / 44.87% Number and Ratio of Shares Subject to Major Contracts: Previous Report: 5,091,254 shares / 25.49% This Report: 4,924,241 shares / 24.66% Number and Ratio of Voting Rights: Previous Report: — / — This Report: — / — Number and Ratio of Voting Rights Subject to Major Contracts: Previous Report: — / — This Report: — / — Reason for Report: Change in stock pledge loan agreement ※ As of the report preparation date, the issuing company has not issued shares with multiple voting rights. ※ The reporter confirms that the shareholding status of the reporter and specially related persons has been accurately recorded in accordance with applicable laws and disclosure guidelines as of the report preparation date, and that there are no material misstatements or omissions. === PART 1: OVERVIEW OF REPORT === 1. Information on the Issuing Company Company Name: Hana Materials Co., Ltd. Company Code: 166090 Legal Classification: KOSDAQ-listed corporation Total Voting Shares Issued: 19,777,674 shares 2. Information on the Large Shareholder A. Reporter (1) Reporter Overview Report Type: Amendment Joint Filing: No Reporter Classification: Domestic corporation Nationality: Republic of Korea Basis for Classification (if stated as statutory partnership or other organization): — Name (Korean): 하나마이크론 주식회사 Name (English): HANA Micron, Inc. Address (up to township/neighborhood level): Eumbong-myeon, Asan-si, Chungcheongnam-do Business Registration Number: 312-81-50630 Business Type: Semiconductor manufacturing Relationship with Issuing Company: Largest shareholder Contact Information: Company: Hana Micron Co., Ltd. Department: Finance Group Title: Senior Staff Phone: 041-42****** Contact Person: Kim Jae-wook Fax: 041-42****** Email: ******hanamicron.co.kr (2) Specific Details on the Reporter (corporation) Legal Form: Stock company (주식회사) Total Assets: KRW 2,017,838,854,218 Total Liabilities: KRW 1,365,163,250,751 Total Equity: KRW 652,675,603,467 Paid-in Capital: KRW 33,189,075,500 Representative Director: Lee Dong-cheol Decision-Making Body: Board of Directors Largest Shareholder: Choi Chang-ho Largest Shareholder Ownership Ratio: 15.15% ※ Total assets, liabilities, equity, and paid-in capital are based on IFRS consolidated financial statements as of end of 2025. Largest shareholder ownership ratio is as of the report preparation date. B. Specially Related Persons (1) Overview of Specially Related Persons No. 1 — Name: Choi Han-su | Classification: Individual (domestic) | Relationship to Reporter: Affiliate executive | DOB: 791208 | Nationality: Korea | Address: Dongcheon-dong, Suji-gu, Yongin-si, Gyeonggi-do | Occupation: President of Hana Materials | Relationship to Issuing Company: Major shareholder No. 2 — Name: Choi Wang-gi | Classification: Individual (domestic) | Relationship to Reporter: Affiliate executive | DOB: 690301 | Nationality: Korea | Address: Buldang-dong, Seobuk-gu, Cheonan-si, Chungnam | Occupation: Vice President of Hana Materials | Relationship to Issuing Company: Executive (registered) No. 3 — Name: Kang Dong-ho | Classification: Individual (domestic) | Relationship to Reporter: Affiliate executive | DOB: 720212 | Nationality: Korea | Address: Yongsan-dong, Yongsan-gu, Seoul | Occupation: Executive Managing Director of Hana Materials | Relationship to Issuing Company: Executive (registered) No. 4 — Name: Yang Do-hwan | Classification: Individual (domestic) | Relationship to Reporter: Affiliate executive | DOB: 690828 | Nationality: Korea | Address: Siksa-dong, Ilsandong-gu, Goyang-si, Gyeonggi-do | Occupation: Executive Managing Director of Hana Materials | Relationship to Issuing Company: Executive (non-registered) No. 5 — Name: Ryu Heung-seon | Classification: Individual (domestic) | Relationship to Reporter: Affiliate executive | DOB: 661207 | Nationality: Korea | Address: Ssangyong-dong, Seobuk-gu, Cheonan-si, Chungnam | Occupation: Senior Managing Director of Hana WLS | Relationship to Issuing Company: Executive (non-registered) No. 6 — Name: Kim Yeong-seok | Classification: Individual (domestic) | Relationship to Reporter: Affiliate executive | DOB: 710905 | Nationality: Korea | Address: Ssangyong-dong, Seobuk-gu, Cheonan-si, Chungnam | Occupation: Executive Managing Director of Hana Materials | Relationship to Issuing Company: Executive (non-registered) No. 7 — Name: Kim Hyeon-ju | Classification: Individual (domestic) | Relationship to Reporter: Affiliate executive | DOB: 650612 | Nationality: Korea | Address: Jeongja-dong, Bundang-gu, Seongnam-si, Gyeonggi | Occupation: CEO of Hana Materials | Relationship to Issuing Company: Executive (registered) * Addresses listed to township/neighborhood level only. (2) Specific Details on Specially Related Persons: Not applicable (all are individuals). C. Collective Investment Business Operator Not applicable. 3. Number of Shares Held and Ownership Ratio Previous Report (2026.05.06): Reporter — Hana Micron Co., Ltd. | Specially Related Persons: 7 | Total Shares: 8,962,208 (44.87%) | Voting Shares: 8,767,208 (44.33%) | Total Voting Shares Issued: 19,777,674 This Report (2026.05.19): Reporter — Hana Micron Co., Ltd. | Specially Related Persons: 7 | Total Shares: 8,962,208 (44.87%) | Voting Shares: 8,767,208 (44.33%) | Total Voting Shares Issued: 19,777,674 Change: 0 shares / 0.00% 4. Purpose of Holding: Management Influence The reporter holds shares with the purpose of influencing management control, which includes: I. Appointment or dismissal of directors and auditors, or suspension of their duties II. Amendment of articles of incorporation related to directors, board of directors, and other corporate bodies III. Changes to the company's share capital IV. Influence over the company's dividend decisions V. Merger (including short-form and small-scale mergers) and spin-off VI. Comprehensive share exchange and transfer VII. Acquisition or disposal of all or a significant portion of the business VIII.Disposal or transfer of all or a significant portion of assets IX. Lease of all or a significant portion of the business, entrustment of management, or conclusion, amendment, or termination of profit-and-loss sharing contracts or similar arrangements X. Dissolution of the company As the largest shareholder, the reporter exercises de facto influence over items I through X above. While there are currently no specific plans with respect to items I through X, as the largest shareholder, if any such matters arise in connection with business execution, the reporter intends to make decisions in accordance with the company's management objectives. 5. Reason for Change / Amendment Method of Change: — Reason for Change: — Reason for Amendment: Change in stock pledge loan agreement === PART 2: LARGE SHAREHOLDING DETAILS === 1. Shareholding Details by Reporter and Specially Related Persons A. Shareholding Details by Type of Securities Reporter — Hana Micron Co., Ltd. (Reg. No. 312-81-50630): Ordinary voting shares: 6,428,508 All other categories: — Total: 6,428,508 shares (32.18%) Specially Related Persons: Choi Han-su (791208): Ordinary shares: 2,300,000 | Total: 2,300,000 (11.51%) Choi Wang-gi (690301): Ordinary shares: 33,700 | Total: 33,700 (0.17%) Kang Dong-ho (720212): Ordinary shares: 5,000 | Other: 40,000 | Total: 45,000 (0.23%) Yang Do-hwan (690828): Other: 20,000 | Total: 20,000 (0.10%) Ryu Heung-seon (661207):Other: 20,000 | Total: 20,000 (0.10%) Kim Yeong-seok (710905):Other: 15,000 | Total: 15,000 (0.08%) Kim Hyeon-ju (650612): Other: 100,000 | Total: 100,000 (0.50%) Totals: Total voting shares issued (I): 19,777,674 Potential shares (H = warrants + CBs + BWs + EBs + DRs + other): 195,000 Combined ownership ratio [(A+H) / (I+H-(E+F+G))] × 100: 44.87% Ordinary share ownership ratio [A / I] × 100: 44.33% ※ E, F, G refer to exchange bonds where the underlying exchange asset is shares, and depositary receipts where the underlying asset is shares.