Director to Sell 659,024 Rights Certificates Worth ~KRW 2.72B

Report on Trading Plan for Specified Securities by Executives and Major Shareholders Version 6.0 LB Semicon Co., Ltd. Report on Trading Plan for Specified Securities by Executives and Major Shareholders To: Securities and Futures Commission To: Korea Exchange Transaction 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 trading plan for the reporter's specified securities has been accurately prepared in accordance with relevant laws and notes on preparation, and that there are no false statements or omissions of material facts. Reporter: Koo Bon-wan 1. Information on the Issuing Company Company Name: LB Semicon Co., Ltd. Corporate Classification: KOSDAQ-listed Corporation Company Code: 061970 Total Issued Shares: 58,083,006 2. Information on the Reporter Reporter Classification: Individual (Domestic) Name (Korean): Koo Bon-wan Name (Chinese/English): 具本完 Date of Birth or Business Registration Number: 661030 Address (up to dong/town/village level): Hannam-dong, Yongsan-gu, Seoul Relationship with Issuing Company: Executive (Registered) Registration Status: Registered Executive Position: Other Non-standing Director Appointment Date: March 31, 2025 Retirement Date: - Major Shareholder: - Business Contact: Affiliated Company: LB Semicon Co., Ltd. Department: Planning Team Position: Manager (Chaegim) Phone Number: 031-68****** Name: Han Sun-kwang Fax Number: 031-68****** Email: ******1@lbsemicon.com 3. Ownership Status and Trading Plan for Specified Securities A. Ownership Status by Type of Specified Securities at Time of Trading Plan Submission - Common Shares (A): 3,189,842 - Securities Representing Subscription Rights (B): 659,024 - Convertible Bonds (C): - - Bonds with Warrants (D): - - Profit-participating Bonds (E): - - Exchangeable Bonds (F): - - Depositary Receipts (G): - - Other (H): - - Total (I): 3,848,866 - Ratio: 6.55% Total Issued Shares (J): 58,083,006 Number of Specified Securities Other Than Common Shares (B+C+D+E+F+G+H=I): 659,024 Ownership Ratio: 6.55% Ownership Ratio of Specified Securities [(A+I) / (J+I-(F+G+H))] × 100: 6.55% Ownership Ratio of Common Shares (A / J) × 100: 5.49% * Shares underlying exchangeable bonds, derivatives-linked securities, depositary receipts, and financial investment products are excluded from the denominator when calculating ownership ratio. B. Detailed Transaction History for the 6 Months Preceding the Trading Start Date None. C. Trading Plan (1) Purpose of Transaction Purpose: Sale of subscription rights certificates by the reporter. (2) Trading Volume and Amount Transaction Start Date (Settlement Date): July 20, 2026 Transaction End Date (Settlement Date): July 23, 2026 Transaction Period: 4 days Trading Method: Off-Exchange Sale (-) Type of Specified Securities: Securities Representing Subscription Rights Number of Specified Securities (Shares) ①: 659,024 Acquisition/Disposal Unit Price (KRW) ②: 4,125 Transaction Amount ③: 2,718,474,000 Note: The acquisition/disposal unit price is recorded as the first issue price of the rights offering with public subscription for forfeited shares in accordance with the disclosure form. The actual confirmed issue price will be determined 3 trading days before the first day of the existing shareholders' subscription. Furthermore, the actual acquisition/disposal unit price will be determined as the arithmetic average of closing prices during the 5 business days of the subscription rights certificate listing period (July 10-16, 2026), so it may differ from the unit price stated in this disclosure document. * The expected disposal unit price of KRW 4,150 [sic: KRW 4,125] and the planned transaction amount (approximately KRW 2.7 billion) stated in this report are formal amounts calculated by applying the first issue price of the rights offering with public subscription for forfeited shares as the unit price, in accordance with disclosure form preparation standards. ① Number of Specified Securities: For common shares, refers to the number of shares. For specified securities other than common shares, refers to the number of shares that can be acquired/disposed of through exercise of rights on the settlement date (e.g., for CBs, the face value divided by the conversion price; for CB call options, the face value of the underlying CB divided by the conversion price; for stock options, the number of shares that can be acquired/disposed of through exercise of the rights). ② Acquisition/Disposal Unit Price: For common shares, refers to the trading unit price of the shares. For specified securities other than common shares, refers to the exercise (conversion/exchange) price of the security, or the trading unit price of shares acquired/disposed of through the exercise of rights (e.g., for CBs, the conversion price; for CB call options, the conversion price of the underlying CB; for stock options, the exercise price of rights to trade the underlying shares). ③ Transaction Amount: Refers to the number of specified securities (①) multiplied by the acquisition/disposal unit price (②). ※ The number of specified securities (①) and acquisition/disposal unit price (②) represent the reporter's "expected quantity and unit price." Pursuant to law (§173-3③), the reporter may trade differently from the plan within a range of 70-130% of the transaction amount (③ = unit price × quantity), so the actual trading unit price and quantity may differ. ④ The subscription rights certificates are scheduled to be issued on July 3, 2026, the expected notification date of new share allocation. However, if the schedule of the rights offering currently in progress as of the submission date of this disclosure document changes, the new share allocation notification date may change, and the above transaction dates may also change. (3) Basis for Calculation of Acquisition/Disposal Unit Price Type of Specified Securities: Securities Representing Subscription Rights Acquisition/Disposal Unit Price (KRW): 4,125 Basis: The acquisition/disposal unit price is recorded as the first issue price of the rights offering with public subscription for forfeited shares in accordance with the disclosure form. The actual confirmed issue price will be determined 3 trading days before the first day of the existing shareholders' subscription. However, the actual acquisition/disposal unit price will be determined as the arithmetic average of closing prices during the 5 business days of the subscription rights certificate listing period (July 10-16, 2026), and is therefore unknown as of the submission date. For reference, the first issue price of the rights offering with public subscription for forfeited shares is stated, and may differ from the unit price stated in this disclosure document. (4) Contracts Related to Specified Securities Planned for Transaction None. D. Transaction Scale Assessment Number of Specified Securities (Shares): 659,024 Acquisition/Disposal Unit Price (KRW): 4,125 Transaction Amount: 2,718,474,000 Transaction History for 6 Months Preceding Transaction Start Date: None Trading Plan: 659,024 shares / KRW 4,125 / KRW 2,718,474,000 Total: 659,024 shares / KRW 2,718,474,000 Total Issued Shares (J): 58,083,006 Number of Traded Specified Securities (P): 659,024 Trading Ratio of Specified Securities (%) (P / (J+P)) × 100: 1.12% * Common shares, shares underlying exchangeable bonds, derivatives-linked securities, depositary receipts, and financial investment products are excluded from the denominator (P). E. Expected Ownership Status by Type of Specified Securities After Completion of Trading Plan - Common Shares (A): 3,189,842 - Securities Representing Subscription Rights (B): - - Convertible Bonds (C): - - Bonds with Warrants (D): - - Profit-participating Bonds (E): - - Exchangeable Bonds (F): - - Depositary Receipts (G): - - Other (H): - - Total (I): 3,189,842 - Ratio: 5.49% Total Issued Shares (J): 58,083,006 Number of Specified Securities Other Than Common Shares: - Ownership Ratio: 5.49% Ownership Ratio of Specified Securities [(A+I) / (J+I-(F+G+H))] × 100: 5.49% Ownership Ratio of Common Shares (A / J) × 100: 5.49% * Shares underlying exchangeable bonds, derivatives-linked securities, and depositary receipts are excluded from the denominator (F+G+H) when calculating the ratio.