Material event report (bonus issue)

A later amendment corrects this filing, so the terms on this page may be out of date. See the latest version (2026-07-20) →

What happened

Material Event Report (Bonus Issue Decision) 6.0 Alteogen Inc. Material Event Report / Korea Exchange Disclosure Obligation To: Financial Services Commission / Korea Exchange July 16, 2026 Company name: Alteogen Inc. CEO: Jeon Tae-yeon Head office address: 62 Yuseong-daero 1628beon-gil, Yuseong-gu, Daejeon (Jeonmin-dong) Phone: 042-384-8780 Website: http://www.alteogen.com Preparer: Vice President, Finance & Accounting Division, Kim Hang-yeon, Phone: 042-384-8780

Bonus Issue Decision

1. Type and number of new shares: Common shares: 16,068,790; Other class shares: 122,037 2. Par value per share (KRW): 500 3. Total shares issued before the capital increase: Common shares: 53,586,343; Other class shares: 406,793 4. New-share allotment record date: August 6, 2026 5. New shares allotted per existing share: Common shares: 0.3; Other class shares: 0.3 6. Dividend record start date for new shares: January 1, 2026 7. Scheduled new share certificate delivery date: - 8. Scheduled listing date of new shares: August 20, 2026 9. Board resolution date (decision date): July 16, 2026 Attendance of outside directors: Present: 4; Absent: - Attendance of the auditor (audit committee): Present

10. Other matters for reference in investment decisions: 1) Bonus issue allotment details [Unit: shares] Category: Total shares issued before the bonus issue / Bonus-issue allotment / Total shares issued after the bonus issue Common shares (excluding treasury shares): 53,562,635 / 16,068,790 / 69,631,425 Common shares (treasury shares): 23,708 / - / 23,708 Redeemable convertible preferred shares: 406,793 / 122,037 / 528,830 Total: 53,993,136 / 16,190,827 / 70,183,963 2) New-share allotment and treatment of fractional shares: New shares will be allotted at a ratio of 0.3 new shares (30%) per share held to shareholders (excluding treasury shares) recorded in the register of shareholders as of the above new-share allotment record date; fractional shares of less than one share will be paid in cash based on the closing price on the first day of listing of the new shares. 3) Source of funds for the new shares: KRW 8,095,413,500 from share premium (paid-in capital in excess of par value) 4) Total number of shares not entitled to the new-share allotment: 23,708 treasury common shares 5) The above "7. Scheduled new share certificate delivery date" has been omitted as not applicable due to the implementation of the electronic securities system. 6) Other incidental matters concerning the issuance of new shares are delegated to the CEO, and the above schedule may change in the course of consultation with relevant authorities.

Note on other class shares: Basis in the articles of incorporation: Article 9 (Types of Shares) of the articles of incorporation; Content of the shares: Series 5 registered redeemable convertible preferred shares; Other: Par value: KRW 500; Shares issued: 434,848; Shares currently outstanding: 406,793