[Amended] Material event report (rights offering) (subsidiary) (third-party allotment)

What happened

Amendment Report July 7, 2026

1. Disclosure document being amended: Material event report (rights offering decision) 2. Original submission date of the disclosure document being amended: June 25, 2026 3. Amendment details

Item 9 (Payment date) - reason: change of payment date - before: 2026.07.07 - after: 2026.07.15 Item 12 (Expected listing date of new shares) - reason: change of listing date - before: 2026.08.11 - after: 2026.08.19 Item [Selection process, transaction history, allotment details, etc. by third-party allottee] - reason: change of payer - before: see Note 1 - after: see Note 2 Item [Where the third-party allottee includes a corporation or organization] - reason: content added - before: - - after: see Note 3

Note 1) Before change - [Selection process, transaction history, allotment details, etc. by third-party allottee] Third-party allottee: Shin Dong-seung Relationship with the company or largest shareholder: - Selection process: decided by the board considering the investor's willingness and ability to pay, timing, etc., to achieve the company's management objectives and promptly raise needed funds Transaction history and plans within 6 months before/after the capital increase decision: - Allotted shares: 3,500,000 Remarks: -

Note 2) After change - [Selection process, transaction history, allotment details, etc. by third-party allottee] Third-party allottee: SDS Holdings Co., Ltd. Relationship with the company or largest shareholder: - Selection process: decided by the board considering the investor's willingness and ability to pay, timing, etc., to achieve the company's management objectives and promptly raise needed funds Transaction history and plans within 6 months before/after the capital increase decision: - Allotted shares: 3,500,000 Remarks: -

Note 3) Content added - [Where the third-party allottee includes a corporation or organization] (1) Basic information on the corporation or organization Name: SDS Holdings Co., Ltd. Number of investors: 1 Representative director: Shin Dong-seung, 100% Largest shareholder: Shin Dong-seung, 100%

(2) Key financial information for the most recent fiscal year (Unit: KRW million) Fiscal year 2025, closing month December Total assets: 1 Revenue: 0 Total liabilities: 0 Net income (loss): 0 Total equity: 1 External auditor: - Capital stock: 1 Audit opinion: - Funding method: third-party borrowing Funding background: plans to raise the payment funds through borrowing

Material Event Report / Exchange Reporting Duty Matter Report on Material Management Matter of Subsidiary APTN Inc.

To: Financial Services Commission / Korea Exchange July 7, 2026

Company name: APTN Inc. CEO: Kim Jae-seop Head office address: 4th Floor, Bldg. B, Unit 402, 43 Changeop-ro, Sujeong-gu, Seongnam-si, Gyeonggi-do (Siheung-dong, Pangyo Global Biz Center) Phone: 031-727-2023 Website: http://www.aptn-inc.com Preparer: (Title) Managing Director (Name) Yeom Yeong-suk (Phone) 031-727-2023

Rights Offering Decision

1. Type and number of new shares: common shares 3,500,000; other shares - 2. Par value per share (KRW): 1,000 3. Total shares issued before the capital increase: common shares 19,658,914; other shares - 4. Purpose of fundraising: facility funds -; business transfer funds -; working capital -; debt repayment funds -; funds to acquire securities of another company (KRW) 3,500,000,000; other funds - 5. Capital increase method: third-party placement. Regarding other shares: basis in articles of incorporation -; share terms -; other - 6. New share issue price: common shares (KRW) 1,000; other shares - 7. Reference share price: common shares (KRW) 785; other shares - 7-1. Method of calculating reference share price: the lower of [the simple average of the weighted arithmetic average prices over the past 1 month, 1 week, and most recent day, counting back from the day before the board resolution date] and [the most recent day's weighted arithmetic average price] 7-2. Discount or premium rate to reference price (%): - 7-3. Basis for discount (premium) rate: - 8. Basis in the articles of incorporation for the third-party placement: Article 12 (Pre-emptive rights to new shares) 9. Payment date: 2026.07.15 10. Dividend record date for new shares: 2026.01.01 11. Expected date of delivery of new share certificates: - 12. Expected listing date of new shares: 2026.08.19 13. Whether this constitutes a backdoor listing via in-kind contribution: No. Whether there is an in-kind contribution: No. Whether the in-kind contribution property includes shares of an unlisted corporation: not applicable. In-kind contribution value (KRW): -; ratio to total assets at the end of the most recent fiscal year (%): -; number of shares to be paid in: - 14. Whether backdoor-listing requirements are met: not applicable 15. Board resolution date (decision date): 2026.06.25. Outside directors present: 1; absent: 0. Attendance of auditor (audit committee member): present 16. Whether subject to securities registration statement filing: No 17. Reason for exemption from filing: the entire newly issued shares will be held in escrow for 1 year 18. Whether subject to a period during which short-sale-based subscription is prohibited: No; start date -; end date - 19. Whether subject to Fair Trade Commission reporting: not applicable 20. Other matters for investors' reference (Unit: shares, KRW)

Weighted arithmetic average price over the past 1 month (A): trading volume 3,629,407; trading value 4,395,755,313; price 1,211.15 Weighted arithmetic average price over the past 1 week (B): trading volume 738,765; trading value 616,052,708; price 833.90 Weighted arithmetic average price on the most recent day (C): trading volume 158,408; trading value 124,289,854; price 784.62 Arithmetic average of (A), (B), (C) (D): 943.22 Reference price (the lower of (C) and (D)): 784.62 Discount or premium rate (%): - Issue price: 1,000

a. Basis for calculating the new share issue price: Pursuant to Article 5-18 (Determination of issue price for rights offerings) of the "Regulation on Issuance and Disclosure of Securities," for a third-party-placement rights offering the issue price may be set by applying a discount of up to 10% to a reference price equal to the lower of (i) the arithmetic average of the weighted arithmetic average prices over the past 1 month, past 1 week, and the most recent day, and (ii) the most recent day's weighted arithmetic average price; however, since the reference price is at or below par value, no discount was applied and par value was used as the issue price. b. The new shares issued through this rights offering will be placed in escrow with the Korea Securities Depository for 1 year. c. All matters related to this rights offering, including the above schedule, may change depending on the progress of discussions with relevant institutions or the third-party allottee. d. Detailed matters concerning the issuance of the new shares and the execution of the new share subscription agreement with the investor are delegated to the CEO or a person designated by the CEO.

[Basis and purpose of the third-party placement] Articles of incorporation provision: Article 12 [Pre-emptive Rights to New Shares] Purpose: to secure working capital needed for new business development, etc.

Article 12 [Pre-emptive Rights to New Shares] (1) Shareholders have the right to be allotted new shares in proportion to the shares they hold. (2) Notwithstanding paragraph (1), the Company may, by board resolution, allot new shares to persons other than shareholders in cases including: 1. general public offering under Article 165-6 of the Financial Investment Services and Capital Markets Act; 2. exercise of stock options under Articles 340-2 and 542-3 of the Commercial Act; 3. investment by the management institution of a startup support fund under the relevant SME and venture-business support acts; 4. issuance to domestic or foreign financial institutions, institutional investors, partner companies, joint-venture corporations, contributors in kind, individuals or other investors for facility investment, financial structure improvement, M&A, or urgent fundraising, within the authorized share count; 5. issuance to a counterparty for technology introduction, R&D, production, sales, or capital alliance, within the authorized share count; 6. preferential allotment to employee stock ownership association members, within the authorized share count; 7. exercise of employee stock purchase options under Article 39 of the Act on the Promotion of Workers' Welfare; 8. offering or underwriting of shares for KOSPI/KOSDAQ listing; 9. issuance under Article 10-2 of the Regulation on Securities Underwriting Business, etc.; 10. issuance to employee stock ownership association members; 11. issuance for foreign investment under the Foreign Investment Promotion Act, within the authorized share count; 12. issuance in connection with depositary receipts (DRs) under Article 165-16 of the Financial Investment Services and Capital Markets Act, within the authorized share count. (3) Where new shares are issued under any item of paragraph (2), the type, number and issue price of shares shall be determined by board resolution. (4) Where a shareholder waives or forfeits pre-emptive rights, or fractional shares arise, the handling method shall be determined by board resolution.

[Specific purpose of use of funds raised through the third-party placement] [Funds to acquire securities of another company / business transfer funds] Purpose: funds to acquire securities of another company. Counterparty / securities issuer: GPCR Co., Ltd. (equity investment). Business of issuer: new drug R&D using biotechnology techniques. Basis for acquisition price: -

(Unit: KRW million) Fiscal year 2025, closing month December Total assets: 4,099 Revenue: 2,518 Total liabilities: 2,625 Net income (loss): -1,499 Total equity: 1,474 External auditor: Daeju Accounting Corporation Capital stock: 5,163 Audit opinion: unqualified (adequate)

[Selection process, transaction history, allotment details, etc. by third-party allottee] Third-party allottee: SDS Holdings Co., Ltd. Relationship with the company or largest shareholder: - Selection process: decided by the board considering the investor's willingness and ability to pay, timing, etc., to achieve the company's management objectives and promptly raise needed funds Transaction history and plans within 6 months before/after the capital increase decision: - Allotted shares: 3,500,000 Remarks: -

[Where the third-party allottee includes a corporation or organization] (1) Basic information Name: SDS Holdings Co., Ltd. Number of investors: 1 Representative director: Shin Dong-seung, 100% Largest shareholder: Shin Dong-seung, 100%

(2) Key financial information for the most recent fiscal year (Unit: KRW million) Fiscal year 2025, closing month December Total assets: 1 Revenue: 0 Total liabilities: 0 Net income (loss): 0 Total equity: 1 External auditor: - Capital stock: 1 Audit opinion: - Funding method: third-party borrowing Funding background: plans to raise the payment funds through borrowing