[Amended] Material event report (treasury share acquisition)

What happened

Material event report (treasury share acquisition decision) 6.3, UTI Co., Ltd.

Amendment Report (Report) August 6, 2026 1. Disclosure document subject to amendment: Material event report (treasury share acquisition decision) 2. Original filing date of the disclosure document subject to amendment: July 7, 2026 3. Amended items

Item: 3. Expected acquisition period - End date Reason for amendment: Amendment due to change in the acquisition plan Before: August 6, 2026 After: August 14, 2026

Material event report / Matter subject to Korea Exchange reporting obligation To the Financial Services Commission / Korea Exchange July 7, 2026 Company name: UTI Co., Ltd. Representative Director: Park Deok-young Head office address: 50-16 Eungbong-ro, Eungbong-myeon, Yesan-gun, Chungcheongnam-do (Tel) 041-333-4352 (Website) http://www.utikorea.com Preparer in charge: (Title) Executive Director (Name) Im Myeong-il (Tel) 041-333-4352

Decision to acquire treasury shares 1. Planned shares to be acquired (shares): Common shares 700,000; Other shares - 2. Planned acquisition amount (KRW): Common shares -; Other shares - 3. Expected acquisition period: Start date August 6, 2026; End date August 14, 2026 4. Expected holding period: Start date -; End date - 5. Purpose of acquisition: Raising funds for mass-production facilities 6. Acquisition method: Gratuitous gift 7. Entrusted investment broker: - 8. Treasury share holdings before acquisition: Acquired within distributable profit range (shares) Common shares 210,101, ratio 1.1%; Other shares -, ratio -; Other acquisition (shares) Common shares -, ratio -; Other shares -, ratio - 9. Acquisition decision date: July 7, 2026 - Independent (outside) director* attendance: Present 1; Absent - - Attendance of auditor (audit committee member who is not an independent (outside) director*): Present 10. Daily purchase order quantity limit: Common shares -; Other shares - * For listed companies, "independent director"; for unlisted companies, "outside director" applies. 11. Other matters for reference in investment decisions - This treasury share acquisition decision is a case in which the Company's largest shareholder decided to gratuitously gift 700,000 common shares of UTI Co., Ltd. that it holds to the Company, and the Company is receiving that gift. Accordingly, there is no "2. Planned acquisition amount (KRW)" as described above. - The above "4. Expected holding period" is currently undetermined; if the treasury shares are disposed of in the future, this will be disclosed in accordance with relevant laws and regulations following a separate board resolution. - As this acquisition is of treasury shares acquired through a gratuitous gift, the above "10. Daily purchase order quantity limit" is not applicable.

[Treasury share acquisition amount limit] Item: Amount 1. Distributable-profit limit under the Commercial Act as of the end of the immediately preceding fiscal year (a) Net assets: - (b) Amount of capital stock: - (c) Sum of capital reserves and earned surplus reserves accumulated up to the immediately preceding fiscal year: - (d) Unrealized profit as prescribed by presidential decree: - Subtotal (a-b-c-d): - 2. Amount of treasury shares acquired since the end of the immediately preceding fiscal year: - 3. Amount of dividends resolved at the ordinary general shareholders' meeting since the end of the immediately preceding fiscal year, and the related earned surplus reserve: - 4. Amount of quarterly/interim dividends resolved by the board since the end of the immediately preceding fiscal year, and the related earned surplus reserve: - 5. Trust contract amount: - 6. Acquisition cost of treasury shares disposed of since the end of the immediately preceding fiscal year (moving-average method) (addback): - Treasury share acquisition amount limit (1-2-3-4-5+6): - - This treasury share acquisition is the result of a gratuitous gift from the largest shareholder and does not affect the Company's capital; as it is not a treasury share acquisition within the distributable-profit range prescribed by Article 341 of the Commercial Act, it is not applicable.

[Treasury share holding status before the treasury share acquisition decision] (Unit: shares) Acquisition method: Acquisition within distributable profit range - Direct acquisition - On-exchange direct acquisition: Common shares beginning balance -, acquired (+) -, disposed (-) -, retired (-) -, ending balance -; Other shares same, all "-" Off-exchange direct acquisition: Common shares all "-"; Other shares all "-" Tender offer: Common shares all "-"; Other shares all "-" Subtotal (a): Common shares all "-"; Other shares all "-" Acquisition under trust contract - Holdings by trustee: Common shares all "-"; Other shares all "-" Holdings in kind: Common shares beginning balance 210,101, acquired (+) -, disposed (-) -, retired (-) -, ending balance 210,101 (Note); Other shares all "-" Subtotal (b): Common shares 210,101 / - / - / - / 210,101; Other shares all "-" Other acquisition (c): Common shares all "-"; Other shares all "-" Total (a+b+c): Common shares 210,101 / - / - / - / 210,101; Other shares all "-"

Note) The 210,101 shares in the above beginning and ending balances are shares deposited with the Korea Securities Depository as the underlying shares for the Company's 4th unregistered, unsecured, privately placed exchangeable bonds issued on October 2, 2025. For details of the treasury share disposal, please refer to the "Treasury Share Disposal Results Report" filed by the Company on October 2, 2025.