Major Shareholder Holdings Report — Stake Rises to 26.41% — Hana Micron

Summary

The largest shareholder, Choi Chang-ho, increased his and related parties' combined holdings from 17,479,643 shares (26.27%) to 17,640,943 shares (26.41%), a net gain of 161,300 shares. The change reflects on-market sales by special-related parties, a new filing for stock options granted to executives (expanding the related-party group from 15 to 26 people), and a partial repayment under a stock pledge agreement. The pledged share count decreased from 939,820 (1.41%) to 824,404 (1.23%), indicating reduced collateral encumbrance. The purpose of holding remains management control. Overall, the filing signals a modest strengthening of insider alignment and slightly lower pledge risk.

Historical Impact

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

Median +5d

-6.66%

Range

-12.45% to +6.57%

Positive outcomes

3/7

Filed	P₀	P₊₅	+5d
Jun 2, 2026	₩41,400	₩43,050	+3.99%
Apr 1, 2026	₩30,450	₩31,100

Full Translation

Report on Mass Holding of Stocks, Etc. (General) Version 6.0 Hana Micron Co., Ltd. Report on Mass Holding of Stocks, Etc. (General form: for reports under Article 147 of the Financial Investment Services and Capital Markets Act with the purpose of 'influencing management control') To: Financial Services Commission Date reporting obligation arose: May 14, 2026 To: Korea Exchange Report reference date: May 21, 2026 Reporter: Choi Chang-ho [Summary Information] Issuer: Hana Micron Co., Ltd. Relationship with issuer: Largest shareholder Report classification: Change / Amendment Number and ratio of shares held: - Previous report: 17,479,643 shares (26.27%) - This report: 17,640,943 shares (26.41%) Shares under major contract (pledged) and ratio: - Previous report: 939,820 shares (1.41%) - This report: 824,404 shares (1.23%) Voting rights count and ratio: Not applicable (both prior and current). Reason for filing: - Change in shareholdings of special-related parties (on-market sale) - New filing of special-related parties (grant of stock purchase options) - Modification of stock pledge agreement (partial repayment) The reporter confirms that the holdings of the reporter and special-related parties as of the reference date have been accurately prepared in accordance with relevant laws and disclosure rules, with no material misstatements or omissions. Part 1. Overview of the Report 1. Information on the issuer - Company name: Hana Micron Co., Ltd. - Company code: 067310 - Corporate classification: KOSDAQ-listed company - Total issued shares with voting rights: 66,464,226 2. Information on the mass holder A. Reporter - Classification: Change/Amendment; Individual (domestic); Nationality: Korea - Name: Choi Chang-ho (崔昌浩 / Choi Chang Ho) - Address: Dongcheon-dong, Suji-gu, Yongin-si, Gyeonggi-do - Date of birth: 1950.12.26 - Occupation: Business executive - Relationship with issuer: Largest shareholder - Contact: Hana Micron Co., Ltd., Finance Group, Senior Manager Kim Jae-uk B. Special-related parties 1. Oh Mun-suk — Individual (domestic), relative, Korea, Yongin-si 2. Lee Dong-cheol — Executive, CEO of Hana Micron, registered director 3. Park Sang-muk — Executive, Senior Managing Director, registered 4. Kim Jun-sik — Executive, Vice President, unregistered 5. Jeong Won-seok — Executive, Vice President, unregistered 6. Ryu Gi-tae — Executive, Vice President, unregistered 7. Joo Sun-seok — Executive, Senior Managing Director, unregistered 8. Kim Jin-seok — Executive, Senior Managing Director, unregistered 9. Jang Jin-uk — Executive (foreign/US national), Senior Managing Director, unregistered 10-25. Various Managing/Executive Directors (unregistered), all affiliated with Hana Micron 26. Hana Materials Co., Ltd. — Domestic corporation, affiliate, semiconductor manufacturer; total assets KRW 685.6 billion, liabilities KRW 221.9 billion, equity KRW 463.7 billion, capital KRW 9.89 billion, CEO Kim Hyun-ju, largest shareholder Hana Micron (32.50%). (Figures based on 2025 year-end IFRS consolidated financials.) C. Collective investment business operator: Not applicable. 3. Number and ratio of shares held - Previous report (2026.04.01): Choi Chang-ho + 15 special-related parties — 17,479,643 shares total (26.27%); common stock 17,398,977 (26.18%) - This report (2026.05.21): Choi Chang-ho + 26 special-related parties — 17,640,943 shares total (26.41%); common stock 17,350,277 (26.10%) - Net change: +161,300 shares (+0.14%); common stock −48,700 shares (−0.08%) - Total issued voting shares unchanged at 66,464,226 4. Purpose of holding: Influence over management control, including: I. Appointment/dismissal of directors and auditors or suspension of duties II. Changes to articles of incorporation regarding directors, the board, and other corporate bodies III. Changes to company capital IV. Influence over dividend decisions V. Mergers (including simplified and small-scale) and divisions VI. Comprehensive share exchanges and transfers VII. Transfer/acquisition of all or material parts of the business VIII. Disposal/transfer of all or material parts of assets IX. Lease, management delegation, or joint operation of all or material parts of the business [Translation truncated]