[Amended] Treasury share disposal: results report

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Treasury share disposal: results report Namsung Co., Ltd.

Amendment report (notice) August 19, 2026

1. Disclosure document being amended: Treasury share disposal: results report 2. Original filing date of the disclosure document being amended: December 29, 2025 3. Amendment items:

Item: 2.c. Type and number of shares disposed in the report Reason: Recovery of exchange-target shares following early redemption of the exchangeable bond Before: Common stock 262,390 shares After: Common stock 0 shares

Item: 3. Details of disposal Reason: Recovery of exchange-target shares following early redemption of the exchangeable bond, and reflecting the exchange price as adjusted for the bonus share issue See Note 1), Note 2)

Item: 4. Whether the disposal report matches actual disposal Reason: Recovery of exchange-target shares following early redemption of the exchangeable bond See Note 3), Note 4)

Item: 5. Status of treasury shares held after disposal Reason: Recovery of exchange-target shares following early redemption of the exchangeable bond See Note 5), Note 6)

Note 1) (Unit: KRW, shares) Date: December 29, 2025; Type: common stock; Order quantity: -; Disposed quantity: 262,390; Price per share disposed: 10,290; Total disposal amount: 2,700,000,000; Disposal counterparty, selling broker: -, - Total: - / 262,390 / 10,290 / 2,700,000,000 / - / - Note 1) The above disposal details were prepared on the assumption that, in connection with the Series 33 unregistered, non-interest-bearing, unsecured, privately placed exchangeable bond issued by the Company on December 29, 2025, the total 262,390 treasury shares subject to exchange under that bond were deemed to have been exchanged on the same date. Note 2) The actual disposal details will be finalized when the exchange right of the exchangeable bond is exercised; the relevant treasury shares are currently held in deposit at the Korea Securities Depository. Note 3) The above disposal price per share is the exchange price per share of the Series 33 bond issued on December 29, 2025. Note 4) For details concerning the issuance of the exchangeable bond and the decision to dispose of treasury shares, see the Company's "Material event report (decision to issue exchangeable bonds)" and "Material event report (decision on treasury share disposal)" filed December 24, 2025.

Note 2) (Unit: KRW, shares) Date: December 29, 2025; Type: common stock; Order quantity: -; Disposed quantity: -; Price per share disposed: 8,171; Total disposal amount: -; Disposal counterparty, selling broker: -, - Total: - / - / 8,171 / - / - / - Note 1) The above disposal details relate to the Series 33 bond issued December 29, 2025; as of this amendment filing date, early acquisition before maturity has been decided pursuant to the bondholder's redemption request under Article 3, Paragraph 24 of the underwriting agreement, and the total 330,436 treasury shares subject to exchange under this bond are to be returned. Note 2) The above disposal price per share is the exchange price per share of the Series 33 bond. Note 3) For details concerning the issuance of the exchangeable bond, see the Company's "Material event report (decision to issue exchangeable bonds)" filed August 19, 2026.

Note 3) Planned disposal shares (shares) vs. total disposed shares (shares): common stock 262,390 / 262,390; other stock - / -; Matched: Matched; Reason for discrepancy, if any: - Note 4) Planned disposal shares vs. total disposed shares: common stock - / -; other stock - / -; Matched: Matched; Reason: - Note 5) [As of December 29, 2025] (Unit: KRW, shares, %) Type: common stock; Holdings under Article 165-3 (A): quantity 226,577; ratio 6.26%; total value 1,403,017,013; Holdings under trust contract, etc. (B): -; Total (A+B): quantity 226,577; ratio 6.26%; amount 1,403,017,013 Note 6) [As of August 19, 2026] (Unit: KRW, shares, %) Type: common stock; Holdings (A): quantity 494,745; ratio 10.85%; total value 3,065,955,626; Holdings under trust contract (B): -; Total (A+B): quantity 494,745; ratio 10.85%; amount 3,065,955,626

Treasury share disposal: results report To: Financial Supervisory Service August 19, 2026 Company name: Namsung Co., Ltd. CEO: Yoon Seong-ho Head office location: 130 Digital-ro, Geumcheon-gu, Seoul Phone: 02-2109-1550 Website: http://www.namsung.com Preparer: (Title) Managing Director (Name) Kim Seong-uk (Phone) 02-2109-1503

1. Name and address of the issuer a. Name: Namsung Co., Ltd. b. Address: 130 Digital-ro, Geumcheon-gu, Seoul

2. Details of the disposal report a. Material event report filing date: December 18, 2025 (initial filing); December 24, 2025 (1st amendment); April 16, 2026 (2nd amendment); August 19, 2026 (3rd amendment) b. Disposal period: from December 29, 2025 to December 29, 2025 (*) The above disposal period is the issuance date of the Series 33 bond, issued by the Company using treasury shares as the exchange target. c. Type and number of shares disposed in report: Common stock 0 shares (issuance of an unregistered, non-interest-bearing, unsecured, privately placed exchangeable bond using treasury shares as exchange target)

3. Details of disposal (Unit: KRW, shares) Date: December 29, 2025; Type: common stock; Order quantity: -; Disposed quantity: -; Price per share: 8,171; Total amount: -; Broker: -, - Total: - / - / 8,171 / - / - / - Note 1), Note 2), Note 3): as described above; see the Company's "Material event report (decision to issue exchangeable bonds)" filed August 19, 2026.

4. Whether the disposal report matches actual disposal: Planned vs. total disposed shares: common stock - / -; other stock - / -; Matched: Matched; Reason: -

5. Status of treasury shares held after disposal [as of August 19, 2026] (Unit: KRW, shares, %) Type: common stock; Holdings (A): quantity 494,745; ratio 10.85%; total value 3,065,955,626; Holdings under trust contract (B): -; Total (A+B): quantity 494,745; ratio 10.85%; amount 3,065,955,626