[Amended] Treasury share disposal: results report

What happened

Treasury Share Disposal Results Report, Amendment Report, dated August 5, 2026.

1. Disclosure document being amended: Treasury Share Disposal Results Report 2. Original filing date of the document being amended: September 19, 2025 3. Amended items:

Item "2. Disposal report details (b) Disposal period", Reason for amendment: the number of shares requested for exchange by bondholders under the Series 3 exchangeable bonds (exchange-eligible asset: the company's treasury shares) has been finalized; the disposed share count is reduced from the amount previously disclosed because a 2-share fraction arose from the face-value-based exchange request and was returned to the company as treasury stock on August 5, 2026. Before amendment: disposal period from September 19, 2025 to September 19, 2025. After amendment: disposal period from September 19, 2025 to September 19, 2025 (unchanged). Note: the "disposal period" above records the exchangeable bond's issuance date; the actual completion date of the treasury-share disposal is August 5, 2026, when the exchange-right exercise and the fractional-share return were completed.

Item "2. Disposal report details (c) Type and number of shares reported for disposal": Before amendment: GnCenergy Co., Ltd. registered common shares, 426,004 shares. After amendment: GnCenergy Co., Ltd. registered common shares, 426,002 shares.

Item "3. Disposal details" (Note 1): Before amendment (unit: KRW, shares): Date: September 19, 2025; Type: common shares; Quantity: 426,004; Disposal price per share: 34,450; Total disposal value: 14,675,837,800; Disposal target/consignee securities firm/order quantity/disposal quantity/financial-investor ID: not applicable. Total: 426,004 shares; 34,450; 14,675,837,800. Note 1: The treasury-share disposal above is finalized when the exchangeable bonds' exchange right is exercised; these treasury shares are currently held in custody at the Korea Securities Depository. Note 2: For details on the exchangeable-bond issuance and the treasury-share disposal decision, see the company's "Material Event Report (Decision to Issue Exchangeable Bonds)" and "Material Event Report (Decision on Treasury Share Disposal)," both first disclosed on September 10, 2025.

After amendment (unit: KRW, shares): Row 1, Date: September 19, 2025; Type: common shares; Quantity: 426,004; Disposal price per share: 34,450; Total disposal value: 14,675,837,800. Row 2, Date: August 5, 2026; Type: common shares; Quantity: -2; Disposal price per share: 34,450; Total disposal value: -68,900. Total: 426,002 shares; 34,450; 14,675,768,900. Note 1: The above treasury-share disposal was originally disclosed assuming that 426,004 treasury shares would be requested for exchange in connection with the Series 3 bearer, unregistered, unsecured private exchangeable bonds the company issued on September 19, 2025. Note 2: The Series 3 exchangeable bonds were partially exchanged on November 4, 2025 and July 27, 2026, and the entire remaining balance was exchanged on August 4, 2026, finalizing the treasury-share disposal quantity. During this exchange process, a 2-share fraction arose from face-value-based exercise of the bonds; because this fractional share was returned to the company, the company's final treasury-share disposal quantity was finalized at 426,002 shares. Note 3: For details on the exchangeable-bond issuance and the treasury-share disposal decision, see the company's "Material Event Report (Decision to Issue Exchangeable Bonds)" and "Material Event Report (Decision on Treasury Share Disposal)," both first disclosed on September 10, 2025.

Item "4. Match between the disposal report and the actual disposal" (Note 2): Before amendment: Planned disposal shares, common shares 426,004, other shares none; Actual total disposed shares, common shares 426,004, other shares none; Match: Yes; Reason for any difference: none. After amendment: Planned disposal shares, common shares 426,004, other shares none; Actual total disposed shares, common shares 426,002, other shares none; Match: No; Reason for difference: a 2-share fraction arising from the exercise of the exchange right on the Series 3 exchangeable bonds was returned to the company (August 5, 2026).

Item "5. Treasury-share holdings after disposal" (Note 3): Before amendment, as of September 19, 2025 (unit: KRW, shares, %): Common shares, holdings under Capital Markets Act Article 165-3 (A): quantity 0, ratio 0, total value 0; holdings under trust contracts etc. under Article 165-3 (B): quantity 0, ratio 0, contract amount 0; total (A+B): quantity 0, ratio 0, amount 0. Note 1: The 426,004 treasury shares subject to exchange were excluded from the holdings figures above, treated as already requested for exchange. Note 2: The exchange-request period runs from October 19, 2025 to August 19, 2028; disposal is finalized at the time the exchange right is exercised.

After amendment, as of August 5, 2026 (unit: KRW, shares, %): Common shares, holdings under Article 165-3 (A): quantity 2, ratio 0.00%, total value 68,900; trust-contract holdings (B): quantity 0, ratio 0, amount 0; total (A+B): quantity 2, ratio 0.00%, amount 68,900. Note: This reflects the finalized treasury-share disposal following completion of the exchange request on the Series 3 exchangeable bonds issued September 19, 2025; the value of the 2-share fraction was calculated using the exchangeable bonds' exchange price.

Item "6. Disposal counterparties, relationship to the company/largest shareholder, selection background, etc." (Note 4): Before and after amendment, counterparty: KDBC-Korea Investment & Securities Mezzanine No. 1 New Technology Business Investment Association; relationship to company or largest shareholder: none; selection background: selected considering the investor's funding capacity and timing, for financing needed for the company's business purposes. Before amendment: disposed shares 426,004; note: none. After amendment: disposed shares 426,002; note: none.

Treasury Share Disposal Results Report, submitted to the Governor of the Financial Supervisory Service, dated August 5, 2026. Company: GnCenergy Co., Ltd. CEO: An Byeong-cheol. Head office: 49 Magokjungang 2-ro, Gangseo-gu, Seoul. Tel: 02-2164-7200. Website: http://www.gncenergy.co.kr. Preparer: Managing Director Kim Geon, Tel: 02-2164-7200.

1. Issuer's name and address (a) Name: GnCenergy Co., Ltd. (b) Address: 49 Magokjungang 2-ro, Gangseo-gu, Seoul.

2. Disposal report details (a) Material event report filing date: September 10, 2025. (b) Disposal period: September 19, 2025 to September 19, 2025. Note: the "disposal period" above records the exchangeable bond's issuance date; the actual completion date of the treasury-share disposal is August 5, 2026, when the exchange-right exercise and the fractional-share return were completed. (c) Type and number of shares reported for disposal: GnCenergy Co., Ltd. registered common shares, 426,002 shares.

3. Disposal details (unit: KRW, shares): Date: September 19, 2025; common shares; quantity 426,004; disposal price per share 34,450; total disposal value 14,675,837,800. Date: August 5, 2026; common shares; quantity -2; disposal price per share 34,450; total disposal value -68,900. Total: 426,002 shares; 34,450; 14,675,768,900. Note 1: The above treasury-share disposal was originally disclosed assuming that 426,004 treasury shares would be requested for exchange in connection with the Series 3 bearer, unregistered, unsecured private exchangeable bonds the company issued on September 19, 2025. Note 2: The Series 3 exchangeable bonds were partially exchanged on November 4, 2025 and July 27, 2026, and the entire remaining balance was exchanged on August 4, 2026, finalizing the treasury-share disposal quantity. A 2-share fraction arose from face-value-based exercise during this process and was returned to the company, finalizing the disposal quantity at 426,002 shares. Note 3: For details on the exchangeable-bond issuance and the treasury-share disposal decision, see the company's "Material Event Report (Decision to Issue Exchangeable Bonds)" and "Material Event Report (Decision on Treasury Share Disposal)," both first disclosed on September 10, 2025.

4. Match between the disposal report and the actual disposal: Planned disposal shares, common shares 426,004, other shares none; Actual total disposed shares, common shares 426,002, other shares none; Match: No; Reason for difference: a 2-share fraction arising from exercise of the exchange right on the Series 3 exchangeable bonds was returned to the company (August 5, 2026).

5. Treasury-share holdings after disposal, as of August 5, 2026 (unit: KRW, shares, %): Common shares, holdings under Capital Markets Act Article 165-3 (A): quantity 2, ratio 0.00%, total value 68,900; trust-contract holdings (B): quantity 0, ratio 0, amount 0; total (A+B): quantity 2, ratio 0.00%, amount 68,900. Note: Reflects the finalized treasury-share disposal following completion of the exchange request on the Series 3 exchangeable bonds issued September 19, 2025; the value of the 2-share fraction was calculated using the exchangeable bonds' exchange price.

6. Treasury-share holdings after disposal, by disposal counterparty, relationship to the company/largest shareholder, selection background: Counterparty: KDBC-Korea Investment & Securities Mezzanine No. 1 New Technology Business Investment Association; relationship: none; selection background: selected considering the investor's funding capacity and timing, for financing needed for the company's business purposes; disposed shares: 426,002; note: none.