[Amended] Material event report (convertible bonds) (subsidiary)

What happened

Amendment Report, July 24, 2026

1. Disclosure document being amended: Material event report (convertible bond issuance decision) 2. Original filing date of the document being amended: June 25, 2026 3. Amendments

Item 2. Face (electronically registered) amount of bonds (KRW) - Reason: Change in issuance amount - Before: 15,000,000,000 / After: 10,000,000,000

Item 2-1. Remaining issuance limit under the articles of incorporation (KRW) - Reason: Amendment due to change in issuance amount - Before: 4,803,802,000,000 / After: 4,808,802,000,000

Item 3. Purpose of funding - Working capital (KRW) - Reason: Change in issuance amount - Before: 15,000,000,000 / After: 10,000,000,000

Item 9. Conversion matters - Shares to be issued upon conversion (number of shares) - Reason: Amendment due to change in issuance amount - Before: 15,000,000 / After: 10,000,000

Item 9. Conversion matters - Shares to be issued upon conversion (ratio to total shares, %) - Reason: Amendment due to change in issuance amount - Before: 43.27 / After: 30.16

Item 11. Subscription date - Reason: Change in subscription date - Before: June 25, 2026 / After: July 24, 2026

[Bond issuance details by specific subscriber], [Working capital/other capital use], and [Outstanding equity-linked bonds] were all amended for the change in issuance amount; before/after detail follows.

Note 1) Before amendment - [Bond issuance details by specific subscriber] Subscriber: Pina New Technology Investment Partnership - relationship to company/largest shareholder: None - reason for selection: selected by the board considering the investor's intent, payment capacity and timing, to achieve the company's management objectives and promptly raise needed funds - transactions/plans within 6 months before/after: None - face (electronically registered) amount issued: KRW 15,000,000,000

Note 2) After amendment - same subscriber and terms, face amount issued: KRW 10,000,000,000

Note 3) Before amendment - [Working capital/other capital use] (Unit: KRW million) Use: Working capital for new-business development and R&D - planned use 2026: 10,000; 2027: 5,000; 2028 and after: none; total: 15,000

Note 4) After amendment - same use - planned use 2026: 5,000; 2027: 5,000; 2028 and after: none; total: 10,000

Note 5) Before amendment - [Outstanding equity-linked bonds] 6th series unregistered interest-bearing unsecured private CB: balance KRW 15,000,000,000; conversion price KRW 1,309/share; convertible shares 11,459,129; period 2025-09-09~2027-08-09 7th series: balance KRW 1,868,000,000; price KRW 1,309; shares 1,427,043; same period 9th series: balance KRW 75,000,000,000; price KRW 13,980; shares 5,364,806; period 2025-12-04~2027-11-03 8th series: balance KRW 7,600,000,000; price KRW 1,870; shares 4,064,171; period 2027-05-21~2029-04-20 Subtotal: balance KRW 99,468,000,000; shares convertible (A) 22,315,149 Newly issued bond: KRW 15,000,000,000; price KRW 1,000; shares (B) 15,000,000; period 2027-07-25~2031-06-24 Total: balance KRW 114,468,000,000; shares 37,315,149; shares already issued (C) 19,658,914; ratio (D=(A+B)/C) 189.81%

Note 6) After amendment - [Outstanding equity-linked bonds] 6th series: balance KRW 15,000,000,000; price KRW 1,000; shares 15,000,000; period 2025-09-09~2027-08-09 7th series: balance KRW 1,868,000,000; price KRW 1,000; shares 1,868,000; same period 9th series: balance KRW 75,000,000,000; price KRW 13,980; shares 5,364,806; period 2025-12-04~2027-11-03 8th series: balance KRW 7,600,000,000; price KRW 1,000; shares 7,600,000; period 2027-05-21~2029-04-20 Subtotal: balance KRW 99,468,000,000; shares (A) 29,832,806 Newly issued bond: KRW 10,000,000,000; price KRW 1,000; shares (B) 10,000,000; period 2027-07-25~2031-06-24 Total: balance KRW 109,468,000,000; shares 39,832,806; shares already issued (C) 23,158,914; ratio (D=(A+B)/C) 171.99%

Material Event Report / Korea Exchange filing requirement - Material management matter of subsidiary Apton Co., Ltd. To the Financial Services Commission / Korea Exchange, July 24, 2026 Company name: Apton Co., Ltd. | CEO: Kim Jae-seop Head office: 4th floor, Bldg. B, 43 Changeop-ro, Sujeong-gu, Seongnam-si, Gyeonggi-do (Pangyo Global Biz Center, Siheung-dong) Phone: 031-757-2023; Website: http://www.aptn-inc.com Preparer: Managing Director Yeom Yeong-suk, Phone 031-757-2023

Convertible Bond Issuance Decision 1. Type of bond: 11th series, unregistered interest-bearing unsecured private convertible bond 2. Face (electronically registered) amount: KRW 10,000,000,000 2-1. Remaining issuance limit under articles of incorporation: KRW 4,808,802,000,000 2-2. (Overseas issuance) amount, exchange rate, region, market: None 3. Purpose of funding: Working capital KRW 10,000,000,000 (no other category) 4. Interest rate: coupon 0%; yield to maturity 3.0% 5. Maturity date: July 24, 2031 6. Interest payment: accrues from issuance to day before maturity, paid quarterly in arrears at 1/4 of the annual amount (amounts below KRW 1 rounded down); if a payment date is not a banking day, paid the next banking day with no further interest accruing. 7. Principal repayment: bonds held to maturity are redeemed at 116.1184% of face value in a lump sum at maturity (amounts below KRW 1 rounded down); same non-banking-day rule applies. 8. Issuance method: Private placement 9. Conversion matters: conversion ratio 100%; conversion price KRW 1,000/share, determined as 100% of the highest of several one-month/one-week/most-recent-day weighted-average prices as of the day before the June 25, 2026 board resolution (rounded up to the nearest KRW 1; floor at par value); shares to be issued upon conversion: Apton registered common shares, 10,000,000 shares, 30.16% of total shares outstanding; conversion exercise period: July 25, 2027~June 24, 2031; standard anti-dilution adjustment provisions apply for rights offerings, bonus issues, below-market CB/BW issuance, mergers, capital reduction, stock splits/consolidations, with a periodic (every 5 months) reset mechanism (downward floor 70% of original conversion price; upward cap at original issuance price); adjusted price never below par value (KRW 1,000); remaining issuance limit adjustable below 70% of original conversion price: None 9-1. Options: no call option; see item 23 for put option 10. Merger-related matters: None 11. Subscription date: July 24, 2026 12. Payment date: July 24, 2026 13. Payment method: Cash 14. Lead manager: None 15. Guarantor: None 16. Collateral: None 17. Board resolution date: June 25, 2026 - independent/outside directors present: 1, absent: None; auditor (audit committee) present 18. Subject to securities registration statement: No 19. Reason exempted: Private placement (conversion and face-amount splitting prohibited for 1 year from issuance) 20. Subject to short-sale prohibition period for underlying shares: No 21. Securities lending linked to overseas issuance: None 22. Subject to Fair Trade Commission reporting: Not applicable 23. Other matters relevant to investment judgment (1) Put option: bondholders may request early redemption, at face amount x early-redemption yield (amounts below KRW 1 rounded down), starting 1.5 years after issuance on January 24, 2028 and every 3 months thereafter, requested 60-30 days before each payment date; request location: issuer's head office; payment location: KEB Hana Bank Seongnam Corporate Center Branch. Early-redemption schedule and yields: 1st 2028-01-24 104.58522%; 2nd 2028-04-24 105.36961%; 3rd 2028-07-24 106.15988%; 4th 2028-10-24 106.95608%; 5th 2029-01-24 107.75825%; 6th 2029-04-24 108.56644%; 7th 2029-07-24 109.38069%; 8th 2029-10-24 110.20104%; 9th 2030-01-24 111.02755%; 10th 2030-04-24 111.86026%; 11th 2030-07-24 112.69921%; 12th 2030-10-24 113.54446%; 13th 2031-01-24 114.39604%; 14th 2031-04-24 115.25401% (2) Splitting or consolidation of the bond is prohibited for 1 year from issuance. * The "ratio to total shares outstanding" figure above is as of the filing date.

[Bond issuance details by specific subscriber]: Pina New Technology Investment Partnership; no relationship to company/largest shareholder; selected considering the investor's intent, capacity and timing; no related transactions within 6 months; face amount: KRW 10,000,000,000.

[Where the subscriber is a corporation/entity that becomes a shareholder by exercising rights] (1) Basic information: Pina New Technology Investment Partnership - 2 contributors; representative director (managing partner)/largest contributor: Withwin Investment Co., Ltd., 52.4% each. (2) Most recent settlement-period financials (KRW million): fiscal year 2026, settlement month December; total assets 21; revenue 0; total liabilities 0; net income 0; total equity 21; external auditor: not applicable; capital 21; audit opinion: not applicable; funding method: partner contributions; formed as a new-technology investment partnership.

[Specific use of funds raised] - Working capital (KRW million): new-business development and R&D working capital - 2026: 5,000; 2027: 5,000; 2028 and after: none; total: 10,000

[Outstanding equity-linked bonds] (same as Note 6 after-amendment table above): 6th series balance KRW 15,000,000,000, price KRW 1,000, shares 15,000,000, period 2025-09-09~2027-08-09; 7th series balance KRW 1,868,000,000, price KRW 1,000, shares 1,868,000, same period; 9th series balance KRW 75,000,000,000, price KRW 13,980, shares 5,364,806, period 2025-12-04~2027-11-03; 8th series balance KRW 7,600,000,000, price KRW 1,000, shares 7,600,000, period 2027-05-21~2029-04-20; subtotal balance KRW 99,468,000,000, shares (A) 29,832,806; newly issued KRW 10,000,000,000, price KRW 1,000, shares (B) 10,000,000, period 2027-07-25~2031-06-24; total balance KRW 109,468,000,000, shares 39,832,806; shares already issued (C) 23,158,914; ratio (D=(A+B)/C) 171.99%