Chairman Files Trading Plan for Single-Day Open Market Purchase of 25,240 Shares on June 18 — Hanmi Semiconductor

Summary

Chairman and controlling shareholder Kwak Dong Shin has filed a mandatory trading plan disclosing his intent to purchase 25,240 common shares on June 18, 2026, at ₩317,000 per share (based on the prior day's KRX closing price), for a total of approximately ₩8.0 billion. The stated purpose is to enhance corporate value through direct personal acquisition of company shares. This planned purchase follows three open-market buys over the preceding six months totaling 98,394 shares for approximately ₩14.2 billion, indicating a sustained pattern of insider accumulation. Upon execution, the chairman's stake will increase marginally from 33.57% to 33.60% of total issued shares. Under Korean securities law, the actual transaction size may vary within 70–130% of the disclosed transaction amount.

Historical Impact

8 past Insider Ownership Change · ≈ Form 4 events at Hanmi Semiconductor

Median +5d

-0.34%

Range

-15.37% to +45.76%

Positive outcomes

4/8

Filed	P₀	P₊₅	+5d
Jun 16, 2026	₩328,500	₩278,000	-15.37%
Apr 27, 2026	₩373,500	₩394,500	+5.62%

Full Translation

Officer/Major Shareholder Securities Trading Plan Report Version: 6.0 Hanmi Semiconductor Co., Ltd. Officer/Major Shareholder Securities Trading Plan Report To: Securities and Futures Commission To: Korea Exchange Transaction Start Date (Settlement Date): June 18, 2026 Report Obligation Date: May 19, 2026 Report Preparation Base Date: May 19, 2026 ※ The reporter confirms that as of the report preparation base date, the trading plan for the reporter's specific securities has been accurately prepared in accordance with relevant laws and reporting guidelines, and that there are no false statements or omissions of material facts. Reporter: Kwak Dong Shin, Chairman of Hanmi Semiconductor 1. Details of the Issuing Company Company Name: Hanmi Semiconductor Co., Ltd. Corporate Classification: KOSPI-Listed Corporation Company Code: 042700 Total Issued Shares: 95,312,200 2. Details of the Reporter Reporter Classification: Individual (Domestic) Name (Korean): 곽 동 신 Name (Chinese/English): 郭東信 (Kwak Dong Shin) Date of Birth or Business Registration Number: 741217 Address (up to dong/eup/myeon level): Hannam-dong, Yongsan-gu, Seoul Relationship with Issuing Company: Officer (Registered Director) Title: Chairman of Hanmi Semiconductor Appointment Date: March 16, 2007 Resignation Date: — Major Shareholder Status: De facto controlling shareholder Business Contact and Person in Charge: Affiliated Company: Hanmi Semiconductor Co., Ltd. Department: IR Department Position: Assistant Manager Phone: 032-580-1507 Name: Jo Jae-hun Fax: 032-578-5557 Email: 2021089@hanmisemi.com 3. Ownership Status of Specific Securities and Trading Plan A. Ownership Status by Type of Specific Securities at Time of Trading Plan Submission Common Shares: 31,995,152 shares Warrants / Convertible Bonds / Bonds with Warrants / Profit-Participating Bonds / Exchangeable Bonds / Depositary Receipts / Other: — (none) Total: 31,995,152 shares (33.57%) Total Issued Shares (J): 95,312,200 Non-Share Specific Securities (I): — Specific Securities Ownership Ratio [A+I / J+I-(F+G+H)*] × 100: 33.57% Share Ownership Ratio (A / J) × 100: 33.57% B. Detailed Transaction History for the 6 Months Preceding the Transaction Start Date - November 28, 2025 | Open Market Purchase (+) | Common Shares | 41,103 shares | ₩121,757/share | ₩5,004,607,600 - January 5, 2026 | Open Market Purchase (+) | Common Shares | 47,715 shares | ₩129,910/share | ₩6,198,681,300 - April 29, 2026 | Open Market Purchase (+) | Common Shares | 9,576 shares | ₩315,407/share | ₩3,020,342,000 Total: 98,394 shares | ₩14,223,630,900 C. Trading Plan (1) Purpose of Transaction Purpose: To enhance corporate value through direct personal acquisition of company shares (2) Transaction Quantity and Amount Transaction Start Date (Settlement): June 18, 2026 Transaction End Date (Settlement): June 18, 2026 Transaction Period: 1 day Transaction Method: Open Market Purchase (+) Type of Securities: Common Shares Number of Shares ①: 25,240 Unit Price (KRW) ②: ₩317,000 Transaction Amount ③: ₩8,001,080,000 Remarks: — ※ The number of shares (①) and unit price (②) represent the reporter's "estimated quantity and price." Pursuant to Article 173-3, Paragraph 3 of the Act on Capital Markets, the reporter may deviate from the plan within a range of 70–130% of the disclosed transaction amount (③ = unit price × quantity), so actual transaction prices and quantities may differ. (3) Basis for Calculating the Unit Price Type: Common Shares Unit Price: ₩317,000 Basis: Calculated based on the KRX closing price on the day before the reporting date (May 18, 2026). (4) Contracts Regarding the Planned Securities Transaction Type / Contract Date / Key Contract Terms (including price/quantity calculation basis and cancellation conditions): — / — / — D. Assessment of Transaction Scale Prior 6-month aggregate transactions: 98,394 shares / ₩14,223,630,900 Trading Plan: 25,240 shares / ₩317,000 per share / ₩8,001,080,000 Combined Total: 123,634 shares / ₩22,224,710,900 Total Issued Shares (J): 95,312,200 Total Transaction Shares (P): 123,634 Transaction Ratio (%) (P / J+P*) × 100: 0.13% E. Expected Ownership Status by Type After Completion of Trading Plan Common Shares: 32,020,392 shares Warrants / Convertible Bonds / Bonds with Warrants / Profit-Participating Bonds / Exchangeable Bonds / Depositary Receipts / Other: — (none) Total: 32,020,392 shares (33.60%) Total Issued Shares (J): 95,312,200 Non-Share Specific Securities (I): — Specific Securities Ownership Ratio: 33.60% Share Ownership Ratio: 33.60%