Material event report (bonus issue)

What happened

Material Event Report (Decision on Bonus Issue) [Form version] 6.0

RF Materials Co., Ltd.

Material Event Report / Korea Exchange Disclosure Obligation To the Financial Services Commission / Korea Exchange July 10, 2026

Company name: RF Materials Co., Ltd. CEO: Nam Dong-woo Head office address: 213, 215, Gangchon-ro, Danwon-gu, Ansan-si, Gyeonggi-do (Mongnae-dong) (Phone) 031-499-2817 (Website) http://www.rf-materials.com Preparer: (Title) General Manager (Name) Park Geun-yeong (Phone) 031-499-2817

Decision on Bonus Issue

1. Type and number of new shares: common shares (shares) 8,993,704; other shares (shares) - 2. Par value per share (KRW): 500 3. Total shares issued before the capital increase: common shares (shares) 8,995,135; other shares (shares) - 4. Record date for new-share allotment: July 27, 2026 5. Number of new shares allotted per share: common shares (shares) 1; other shares (shares) - 6. Dividend record date for new shares: January 1, 2026 7. Scheduled date for delivery of new share certificates: - 8. Scheduled listing date of new shares: August 18, 2026 9. Board resolution date (decision date): July 10, 2026 Outside directors present: 1; absent: 0 Auditor (audit committee member) present: Present 10. Other matters material to investment decisions (1) Bonus-issue allotment details (Unit: shares) Category: Before the bonus issue; Bonus-issue allotment; After the bonus issue Common shares (excluding treasury shares): 8,993,704; 8,993,704; 17,987,408 Common shares (treasury shares): 1,431; -; 1,431 Total: 8,995,135; 8,993,704; 17,988,839 (2) Amount and source of funds capitalized: share premium, KRW 4,496,852,000 (3) Method of allotment of new shares and treatment of fractional shares: new shares will be allotted at a ratio of 1 new share per share held to shareholders registered in the register of shareholders as of the new-share record date (July 27, 2026) (excluding treasury shares); as the allotment ratio is 1:1, no fractional shares will arise. (4) Item "7. Scheduled date for delivery of new share certificates" above is omitted as not applicable due to the implementation of the electronic securities system. (5) Other incidental matters relating to the new-share issuance are delegated to the CEO, and the above schedule may change in the course of consultation with relevant institutions.

Matters concerning other shares: Articles of incorporation basis -; nature of the shares -; other -