Treasury share acquisition: results report

What happened

Treasury Share Acquisition Results Report 6.0

KCS Inc. (Korea Computer & Systems) Treasury Share Acquisition Results Report To the Governor of the Financial Supervisory Service July 23, 2026

Company name: KCS Inc. (Korea Computer & Systems) CEO: Kim Kwang-muk Head office address: 3gongdan 1-ro, Gumi-si, Gyeongsangbuk-do Phone: 02-6377-5128; Website: http://www.kcins.co.kr Preparer: (Title) Team Leader (Name) Choi Ju-ho; Phone: 02-6377-1528

1. Name and address of the issuer (a) Name: KCS Inc. (b) Address: 3gongdan 1-ro, Gumi-si, Gyeongsangbuk-do

2. Details of the acquisition report (a) Date the material event report was filed: April 22, 2026 (b) Acquisition period: April 23, 2026 to July 22, 2026

3. Acquisition details (unit: KRW, shares) Date: June 11, 2026; Type: common shares; Order quantity: 35,000; Shares actually acquired: 25,005; Average acquisition price per share: KRW 11,750; Total acquisition value: KRW 293,806,650; Broker: Daishin Securities; Financial investment business entity ID: 00110893 Date: June 16, 2026; Type: common shares; Order quantity: 9,995; Shares actually acquired: 165; Average acquisition price per share: KRW 12,300; Total acquisition value: KRW 2,029,500; Broker: Daishin Securities; ID: 00110893 Date: June 18, 2026; Type: common shares; Order quantity: 9,830; Shares actually acquired: 9,830; Average acquisition price per share: KRW 11,753; Total acquisition value: KRW 115,531,000; Broker: Daishin Securities; ID: 00110893 Total: Order quantity 54,825; Shares actually acquired 35,000; Average acquisition price per share KRW 11,753; Total acquisition value KRW 411,367,150

Note: dates are trade-execution dates. "Acquisition price per share" is the average unit price. Neither the per-share price nor the total acquisition value includes commissions.

4. Whether the planned acquisition and the actual acquisition match Planned acquisition amount: common shares KRW 759,500,000; other shares - Total actual acquisition value: common shares KRW 411,367,150; other shares - Shortfall against the planned amount: Yes Reason for the shortfall: The Company has completed the treasury-share acquisition disclosed in its material event report (decision to acquire treasury shares). Because the share price fell during the acquisition period relative to the closing price on the business day preceding the board resolution to acquire treasury shares (April 21, 2026), a gap arose between the planned acquisition amount and the actual total acquisition value.

5. Holding status of treasury shares after the acquisition [as of July 23, 2026] (unit: KRW, shares, %) Holdings under Article 165-3 of the Act (A): common shares 0 shares, 0% of total, value 0 Holdings under trust contracts per Article 165-3 of the Act (B): common shares 0 shares, 0%, contract value 0 Total (A+B): common shares 0 shares, 0%, value 0

Note: the treasury shares acquired in connection with the exercise of stock options were all disposed of together with the treasury-share disposal decision of June 25, 2026; the Company currently holds no treasury shares.

6. Changes in the largest shareholder's shareholding before and after the acquisition [as of July 23, 2026] (unit: shares) Name: Korea Holdings Co., Ltd.; Share type: common shares; Shares held at the acquisition-report date: 8,000,000; Shares held at the acquisition-end date: 8,000,000; Reason for change: - Total, common shares: 8,000,000 / 8,000,000; other shares: - / -; Grand total: 8,000,000 / 8,000,000, no change