Major Shareholder Stake Decreases to 26.16% After On-Market Sale — Hana Micron

Summary

Largest shareholder Choi Chang Ho's combined holdings (including 26 special-related parties) decreased by 165,202 shares to 17,475,741 shares (26.16%), down from 17,640,943 shares (26.41%) reported on May 21, 2026. The change stems from on-market selling by the reporter and related parties, plus changes in shareholding form via stock option exercises. Direct share holdings dropped by 151,002 shares to 17,199,275 (25.87%). The disclosure is filed under the 'intent to influence management' category, though the stake reduction is modest at 0.25 percentage points. Total issued shares rose slightly to 66,478,426, reflecting new shares from option exercises.

Historical Impact

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

Median +5d

-6.66%

Range

-25.05% to +6.57%

Positive outcomes

2/7

Filed	P₀	P₊₅	+5d
May 21, 2026	₩54,500	₩40,850	-25.05%
Apr 1, 2026	₩30,450	₩31,100	+2.13%

Full Translation

Report on Mass Holdings of Stocks (General Form) Filed under: Article 147 of the Financial Investment Services and Capital Markets Act, for cases with 'the purpose of influencing management control' To: Financial Services Commission and Korea Exchange Reporting Obligation Date: June 2, 2026 Report Preparation Reference Date: June 2, 2026 Reporter: Choi Chang Ho [Summary Information] Issuing Company: Hana Micron Inc. Relationship to Issuer: Largest Shareholder Report Type: Change Holding Shares and Ratio: - Previous Report: 17,640,943 shares (26.41%) - Current Report: 17,475,741 shares (26.16%) Shares under Major Contracts: - Previous Report: 824,404 shares (1.23%) - Current Report: 824,404 shares (1.23%) Reason for Filing: Change in shares owned by the reporter and special-related parties (on-market sale); change in shareholding form of special-related parties (exercise of stock options). Part 1. Overview of the Report 1. Issuing Company - Company Name: Hana Micron Inc. - Company Code: 067310 - Classification: KOSDAQ-listed corporation - Total Issued Voting Shares: 66,478,426 2. Large Holder A. Reporter - Type: Domestic individual - Nationality: Korea - Name: Choi Chang Ho (崔昌浩) - Address: Dongcheon-dong, Suji-gu, Yongin-si, Gyeonggi-do - Date of Birth: December 26, 1950 - Occupation: Business executive - Relationship to Issuer: Largest Shareholder - Contact: Hana Micron Inc., Finance Group, Chief, Kim Jae-wook B. Special-Related Parties (26 parties) 1. Oh Mun-sook — relative 2. Lee Dong-cheol — CEO of Hana Micron, registered executive 3. Park Sang-muk — Executive Vice President, registered executive 4. Kim Jun-sik — Vice President, non-registered executive 5. Jeong Won-seok — Vice President, non-registered 6. Ryu Gi-tae — Vice President, non-registered 7. Joo Sun-seok — Executive Vice President, non-registered 8. Kim Jin-seok — Executive Vice President, non-registered 9. Jang Jin-wook — Executive Vice President, non-registered (US national) 10–25. Various Managing/Executive Directors (non-registered) 26. Hana Materials Inc. — affiliated company, semiconductor manufacturer (Cheonan, Chungnam); largest shareholder is Hana Micron Inc. with 32.50% stake. Total assets: KRW 685.6 billion; total liabilities: KRW 221.9 billion; total equity: KRW 463.7 billion; capital: KRW 9.89 billion; CEO: Kim Hyun-joo (based on 2025 year-end IFRS consolidated financials). 3. Holding Shares and Ratio - Previous Report (2026.05.21): Choi Chang Ho + 26 related parties — 17,640,943 shares (26.41%) of stocks; 17,350,277 common shares (26.10%); total issued shares 66,464,226. - Current Report (2026.06.02): 17,475,741 shares (26.16%); 17,199,275 common shares (25.87%); total issued shares 66,478,426. - Change: -165,202 shares (-0.25%p); -151,002 common shares (-0.23%p); +14,200 issued shares. 4. Purpose of Holding: Influence over management control, including: I. Appointment/dismissal of directors and auditors II. Amendment of articles related to corporate organs III. Changes in capital IV. Influence over dividend decisions V. Mergers (including simplified/small-scale) and spin-offs VI. Comprehensive share exchange and transfer VII. Transfer of all or material portion of business VIII. Disposal/transfer of all or material assets IX. Lease, management delegation, or other transfer of business to a third party [Translation truncated]