| 1. Number of shares to be disposed | Common Shares | 3,109 | ||||||
| Other Shares | — | |||||||
| 2. Share Price for Disposal (KRW) | Common Shares | 52,700 | ||||||
| Other Shares | — | |||||||
| 3. Estimated Total Amount (KRW) | Common Shares | 163,844,300 | ||||||
| Other Shares | — | |||||||
| 4. Period of Disposal | From July 24, 2026, to July 24, 2026 | |||||||
| 5. Purpose of Disposal | Delivery of shares pursuant to the grant of RSU(Restricted Stock Units) using treasury shares | |||||||
| 6. Method of Disposal | Over-the-counter disposal | |||||||
| 7. Number of Treasury Shares before Disposal | 13,889,877 (5.51% of total shares) | |||||||
| 8. Date of Approval of Plan for Treasury Share Ownership and Disposal | March 31, 2026 | |||||||
| 9. Date of Resolution | July 14, 2026 | |||||||
| 10. Additional details relevant to investment consideration | –Item 3 above is calculated based on the closing price of the day before the Board resolution, thus the actual disposal amount may vary based on the closing price on the date of disposal. –The Company’s Audit Committee is composed entirely of outside directors. | |||||||
| Dated: July 14, 2026 | ||||||||
| KT Corporation | ||||||||
| By: | /s/ Sun Wook Kim | |||||||
| Name: Sun Wook Kim | ||||||||
| Title: IRO | ||||||||
| By: | /s/ Sanghyun Cho | |||||||
| Name: Sanghyun Cho | ||||||||
| Title: IR Team Leader | ||||||||