Director Plans Off-Market Sale of 919,950 Rights Certificates for ~KRW 3.8B

Report on Trading Plan of Specific Securities by Officers and Major Shareholders (v6.0) LB Semicon Co., Ltd. Report on Trading Plan of Specific Securities by Officers and Major Shareholders To: Securities and Futures Commission To: Korea Exchange Trade Start Date (Settlement Date): July 20, 2026 Reporting Obligation Date: June 19, 2026 Report Reference Date: June 18, 2026 * The reporter hereby confirms that as of the report reference date, the reporter's trading plan for specific securities has been accurately prepared in accordance with relevant laws and preparation notes, and that there are no false statements or omissions of material matters. Reporter: Koo Bon-cheon 1. Information on Issuing Company - Company Name: LB Semicon Co., Ltd. - Corporate Classification: KOSDAQ-listed corporation - Company Code: 061970 - Total Shares Issued: 58,083,006 2. Information on Reporter - Reporter Classification: Individual (Domestic) - Name (Korean): Koo Bon-cheon - Name (Chinese/English): 具本天 - Date of Birth or Business Registration Number: 640511 - Address (to Town/Township/Dong level): Cheongdam-dong, Gangnam-gu, Seoul - Relationship to Issuing Company: Officer (Registered) - Position: Other Non-Executive Director - Appointment Date: March 31, 2025 - Retirement Date: - - Major Shareholder: - - Business Contact: LB Semicon Co., Ltd., Planning Team, Manager Han Soon-gwang, Phone: 031-68******, Email: ******1@lbsemicon.com 3. Ownership Status and Trading Plan of Specific Securities A. Ownership Status by Type at Time of Filing - Common Shares: 4,452,789 - Subscription Rights Certificates: 919,950 - Convertible Bonds / BW / Profit-participating Bonds / Exchangeable Bonds / DR / Other: - - Total: 5,372,739 shares (9.11%) - Total Shares Issued (J): 58,083,006 - Specific securities other than common shares (I): 919,950 - Specific securities ownership ratio: 9.11% - Common stock ownership ratio (A/J): 7.67% B. Detailed Trading History for the 6 Months Prior to Trade Start Date - None C. Trading Plan (1) Purpose of Trade: Sale of reporter's subscription rights certificates (2) Trade Quantity and Amount: - Trade Start Date (Settlement): July 20, 2026 - Trade End Date (Settlement): July 23, 2026 - Trade Period: 4 days - Trade Method: Off-market sale (-) - Type of Specific Securities: Subscription Rights Certificates - Number of Specific Securities: 919,950 - Acquisition/Disposal Price: KRW 4,125 - Trade Amount: KRW 3,794,793,750 - Note: The acquisition/disposal price is listed per disclosure form requirements as the 1st issue price of the rights offering with general public subscription for forfeited shares. The actual finalized issue price will be determined 3 trading days prior to the first day of existing shareholder subscription. The actual acquisition/disposal price will be determined by the arithmetic average of closing prices during the 5 business days of rights certificate listing trading (July 10–16, 2026), which may differ from the price stated in this disclosure. * The disposal price of KRW 4,125 and approximate trade value (~KRW 3.8B) stated in this report are formal amounts calculated using the 1st issue price of the rights offering with general public subscription for forfeited shares, per disclosure form preparation standards. Notes on calculation: ① Number of specific securities: For common shares, the number of shares; for non-common specific securities, the number of shares convertible to be acquired/disposed via rights exercise on the settlement date. ② Acquisition/disposal price: For common shares, the trading price; for non-common specific securities, the exercise (conversion/exchange) price or trading price of shares acquired/disposed via rights exercise. ③ Trade amount: ① × ②. * Per Article 173-3(3) of the Act, reporter may execute trades within 70–130% of the planned trade amount, so actual trade prices and quantities may differ. ④ Subscription rights certificates are scheduled to be issued on July 3, 2026, the new share allocation notification date. If the ongoing rights offering schedule changes, the allocation notification date and trade date may also change. (3) Basis for Acquisition/Disposal Price Calculation: - Subscription Rights Certificates: KRW 4,125 - Basis: Listed per disclosure form as the 1st issue price of rights offering with general public subscription for forfeited shares. Actual finalized issue price determined 3 trading days prior to first day of existing shareholder subscription. Actual acquisition/disposal price will be determined by 5-business-day arithmetic average of closing prices during rights certificate listing trading (July 10–16, 2026), unknown as of filing date; the 1st issue price is provided for reference and may differ from actual price. (4) Contracts Related to Planned Trade of Specific Securities: None D. Trade Scale Assessment - Trade history for 6 months prior to trade start date: None - Trading plan: 919,950 securities × KRW 4,125 = KRW 3,794,793,750 - Total: 919,950 securities / KRW 3,794,793,750 - Total shares issued (J): 58,083,006 - Number of traded specific securities (P): 919,950 - Trade ratio of specific securities: 1.56% (P / (J+P) × 100) E. Expected Ownership Status by Type After Trade Plan Completion - Common Shares: 4,452,789 - Subscription Rights Certificates: - - Other: - - Total: 4,452,789 shares (7.67%) - Total Shares Issued (J): 58,083,006 - Specific securities other than common shares (I): - - Specific securities ownership ratio: 7.67% - Common stock ownership ratio (A/J): 7.67%