Treasury share disposal: results report

What happened

Treasury Share Disposal: Results Report 6.2 GC Cell Co., Ltd.

To: Governor of the Financial Supervisory Service Date: July 20, 2026 Company name: GC Cell Co., Ltd. Representative directors: Kim Jae-wang, Won Seong-yong Head office address: 107 Ihyeon-ro 30beon-gil, Giheung-gu, Yongin-si, Gyeonggi-do (Bojeong-dong) Phone: 031-736-6700 Website: http://www.gccell.com Preparer: Management Support Office Director Yang Jun-yeol, Phone: 031-736-6700

1. Name and address of the issuer (a) Name: GC Cell Co., Ltd. (b) Address: 107 Ihyeon-ro 30beon-gil, Giheung-gu, Yongin-si, Gyeonggi-do (Bojeong-dong)

2. Matters concerning the disposal report (a) Material event report filing date: June 30, 2026 (b) Disposal period: June 30, 2026 to July 20, 2026 (c) Type and number of shares reported for disposal: GC Cell common shares, 73,130 shares

3. Disposal details (Unit: KRW, shares) 2026-07-15: Common shares; order 24,280; disposed 24,280; price 13,010; amount 315,882,800; counterparty: employees and executives 2026-07-16: Common shares; order 28,870; disposed 28,870; price 13,580; amount 392,054,600; counterparty: employees and executives 2026-07-20: Common shares; order 19,980; disposed 19,980; price 13,340; amount 266,533,200; counterparty: employees and executives Total: disposed 73,130; amount 974,470,600 Note 1) The price per share and total disposal amount are based on the regular-session closing price on the day before each disposal date. Note 2) The shares were disposed of by transferring them from the Company's share account directly into each employee's individual account.

4. Whether the planned disposal matches the actual disposal Planned shares for disposal (shares): Common shares 73,203; Other shares: none Total shares disposed (shares): Common shares 73,130; Other shares: none Match: Did not match; Reason for the difference: a change (decrease) in the number of recipients between the material event report filing date and the actual disposal date

5. Treasury share holdings after the disposal [as of July 20, 2026] (Unit: KRW, shares, %) Holdings under Article 165-3 of the Act (A): quantity 0; ratio 0%; total value 0 Holdings under a trust agreement, etc., per Article 165-3 (B): quantity 0; ratio 0%; contract amount 0 Total (A+B): quantity 0; ratio 0%; amount 0 Note 1) As of the filing date of this report, the Company's treasury shares of 700,073 shares, held under Article 341-2 of the Commercial Act, are not reflected in the above table.