Change of largest shareholder

A later amendment corrects this filing, so the terms on this page may be out of date. See the latest version (2026-08-19) →

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AprilBio / Change of largest shareholder / (2026.07.24) Change of largest shareholder

Change of largest shareholder

1. Change details Largest shareholder before change: Cha Sang-hoon and 2 others; shares held (shares) 4,541,000; ownership ratio (%) 19.39 Largest shareholder after change: IMM Healthcare No. 8 Limited Liability Company and 2 others; shares held (shares) 5,981,862; ownership ratio (%) 19.22

2. Reason for the change: Change of largest shareholder through acquisition of the largest shareholder's equity stake and payment for a third-party placement rights offering Whether the change is due to acquisition of forfeited shares: No Whether the transferred shares are subject to a lock-up: Yes

3. Purpose of the equity acquisition: Simple investment Method of financing the acquisition: Own funds (KRW) 166,999,949,766; borrowings (KRW) 87,999,990,504; lender: see "6. Other matters for reference in investment decisions"; borrowing period: - to -; collateral details: see "6. Other matters for reference in investment decisions" Plans to appoint or dismiss officers after the acquisition: None

4. Change date: 2026-07-23 5. Confirmation date of the change: 2026-07-23

6. Other matters for reference in investment decisions - This disclosure relates to the change of largest shareholder resulting from the completion of CEO Cha Sang-hoon's share transfer agreement and the completion of payment for the third-party placement rights offerings by IMM Healthcare No. 8 LLC and IMM Scale-up Bio No. 1 LLC. - The above "1. Change details - ownership ratio before change (%)" is stated based on 23,413,826 issued shares, and the "ownership ratio after change (%)" is stated based on 31,117,877 voting shares issued. After completion of payment for the rights offering, the number of new voting shares scheduled to be issued is 7,704,051 shares. - The specific details of the financing method for the equity acquisition purpose in "3." above are as follows: (i) IMM Healthcare No. 8 LLC financed its total acquisition funds (KRW 149,999,977,092) with own funds (KRW 101,999,977,092) and borrowings (KRW 48,000,000,000); the lender of the above borrowings is TKG Taekwang Co., Ltd., and the borrowing period runs until the date that is 3 months from July 23, 2026. IMM Healthcare No. 8 LLC plans to establish a security interest (pledge) on the securities account into which the 1,663,779 shares of the company provided as collateral for the acquisition financing are deposited, before the mandatory holding period for those shares ends. (ii) IMM Scale-up Bio No. 1 LLC financed its total acquisition funds (KRW 99,999,976,260) with own funds (KRW 59,999,985,756) and borrowings (KRW 39,999,990,504); the lender of the above borrowings is Shinhan Investment Corp., and the borrowing period runs until the date that is 5 years from July 23, 2026. IMM Scale-up Bio No. 1 LLC plans to establish security interests (pledges) on its dividend receipt account, the collateral shares (708,000 common shares), and the securities account into which all of its holdings of company shares are deposited. (iii) The total acquisition funds of IMM Startup Venture Fund No. 2 (KRW 4,999,986,918) were all financed with own funds, with no borrowings. - The above "4. Change date" and "5. Confirmation date of the change" are the payment date for the third-party placement rights offering. 1) Of the 1,770,000 shares acquired through the share transaction, the largest shareholder after the change is an investment purpose company invested in by a private equity fund under Article 47, Paragraph 3, Item 5 of the Enforcement Rules of the KOSDAQ Market Listing Regulations, and is exempt from the mandatory holding period under Article 51 of the KOSDAQ Market Listing Regulations. - The 8,926,305 new shares (including 1,222,254 non-voting convertible preferred shares) issued through the third-party placement rights offering will be placed in a one-year lock-up pursuant to Article 2-2, Paragraph 2 of the Regulation on Issuance and Disclosure of Securities, etc. - The largest shareholder of IMM Healthcare No. 8 LLC, the largest shareholder after the change, is IMM Healthcare No. 8 Private Equity Limited Partnership. - The largest shareholder after the change is a corporation established in July 2026, and "2. Key financial matters, etc." below is prepared as of the filing date of this disclosure. - After the change of largest shareholder, management control will be exercised by TKG Chemical pursuant to a joint investment agreement; please refer to the disclosure "Agreement relating to change of management control."

※ Related disclosures: 2026-07-23 Agreement relating to change of management control 2026-07-23 Rights offering decision (third-party placement) 2026-07-23 Rights offering decision (third-party placement - non-voting convertible preferred shares) 2026-06-25 Rights offering decision (third-party placement - voting convertible preferred shares)

[Details of the change] Cha Sang-hoon, largest shareholder before change: before change shares (shares) 4,425,000, ownership ratio (%) 18.90; after change shares (shares) 2,655,000, ownership ratio (%) 8.53 IMM Healthcare No. 8 LLC, largest shareholder after change: before change shares (shares) 0, ownership ratio (%) 0.0; after change shares (shares) 3,085,998, ownership ratio (%) 9.92 IMM Scale-up Bio No. 1 LLC, related party of the largest shareholder after change: before change shares (shares) 0, ownership ratio (%) 0.0; after change shares (shares) 2,779,458, ownership ratio (%) 8.93 IMM Startup Venture Fund No. 2, related party of the largest shareholder after change: before change shares (shares) 0, ownership ratio (%) 0.0; after change shares (shares) 116,406, ownership ratio (%) 0.37

[Matters relating to the largest shareholder after the change (nominal entity)] 1. Basic corporate information Entity name: IMM Healthcare No. 8 LLC; Nationality: Republic of Korea; Address (head office, stated up to eup/myeon/dong level): 152 Teheran-ro, Gangnam-gu, Seoul; Corporate registration number: 110114-0040550 Main business: Special purpose company under the Financial Investment Services and Capital Markets Act

Largest shareholder, CEO, and representative executive officer status and equity information: Largest shareholder: IMM Healthcare No. 8 Private Equity Limited Partnership; shares held (shares) -; ownership ratio (%) 100 CEO / managing partner: IMM Investment Co., Ltd.; shares held (shares) -; ownership ratio (%) -

Major investors (10% or more) status and equity information: Not applicable (none listed) Career history of officers of the largest shareholder, CEO, representative executive officer, and major investors: Not applicable (none listed) History as largest shareholder of a listed company for the above persons: Not applicable (none listed)

2. Key financial matters, etc. (unit: KRW million) Applicable fiscal year 2026, fiscal year-end December: total assets 102,670; capital stock 102,670; total liabilities -; revenue -; total equity 102,670; net income -; external auditor Not applicable; whether in business suspension No; audit opinion Not applicable; whether closed No

3. Relationship with the listed company Relationship between the listed company and the largest shareholder (corporation): Not applicable Relationship between the listed company's officers and the largest shareholder (corporation): Not applicable (none listed)

4. Transactions between the listed company and the largest shareholder (corporation) in the most recent 3 years (excluding routine transactions) Current year: Not applicable; prior year: Not applicable; year before that: Not applicable