Treasury share acquisition: results report

A later amendment corrects this filing, so the terms on this page may be out of date. See the latest version (2026-08-28) →

What happened

Treasury Share Acquisition: Results Report 6.0 Sejin T S Co., Ltd.

Treasury Share Acquisition: Results Report To: Governor of the Financial Supervisory Service August 25, 2026 Company name: Sejin T S Co., Ltd. CEO: Kim In-sik Head office address: 51-43 Jimun-ro, Wongok-myeon, Anseong-si, Gyeonggi-do Phone: 031-650-3700 Website: http://www.sejints.co.kr Preparer: (Title) Director, (Name) Park Yong-sun, (Phone) 031-650-3700

1. Issuer's name and address (a) Name: Sejin T S Co., Ltd. (b) Address: 51-43 Jimun-ro, Wongok-myeon, Anseong-si, Gyeonggi-do

2. Acquisition report details (a) Material event report filing date: July 31, 2026 (b) Acquisition period: August 3, 2026 to August 25, 2026 (based on trade execution date)

3. Acquisition details (unit: KRW, shares) - date: type; order quantity; acquired quantity; price per share acquired; total acquisition value; brokerage securities company; unique ID 2026-08-03: Common stock; 83,965; 83,965; 2,136; 179,317,990; Shinhan Investment Corp.; 00138321 2026-08-04: Common stock; 83,965; 53,965; 2,214; 119,492,190; Shinhan Investment Corp.; 00138321 2026-08-05: Common stock; 83,965; 37,706; 2,197; 82,855,175; Shinhan Investment Corp.; 00138321 2026-08-06: Common stock; 83,965; 83,965; 2,304; 193,450,215; Shinhan Investment Corp.; 00138321 2026-08-07: Common stock; 83,965; 74,415; 2,359; 175,516,265; Shinhan Investment Corp.; 00138321 2026-08-10: Common stock; 83,965; 26,465; 2,347; 62,106,490; Shinhan Investment Corp.; 00138321 2026-08-11: Common stock; 83,965; 83,965; 2,381; 199,922,770; Shinhan Investment Corp.; 00138321 2026-08-12: Common stock; 83,965; 10,020; 2,438; 24,430,400; Shinhan Investment Corp.; 00138321 2026-08-18: Common stock; 83,965; 39,749; 2,380; 94,601,295; Shinhan Investment Corp.; 00138321 2026-08-19: Common stock; 83,965; 70,970; 2,379; 168,850,490; Shinhan Investment Corp.; 00138321 2026-08-20: Common stock; 83,965; 7,373; 2,380; 17,547,740; Shinhan Investment Corp.; 00138321 2026-08-21: Common stock; 83,965; 39,295; 2,590; 101,774,050; Shinhan Investment Corp.; 00138321 2026-08-24: Common stock; 40,000; 40,000; 2,525; 101,000,000; Shinhan Investment Corp.; 00138321 2026-08-25: Common stock; 45,866; 45,866; 2,550; 116,958,300; Shinhan Investment Corp.; 00138321 Total: order quantity 1,093,446; acquired quantity 697,719; average price 2,347; total acquisition value 1,637,823,370

4. Consistency between the expected and actual acquisition Expected acquisition amount (KRW): common stock 1,646,000,000; other classes: none Total acquisition value (KRW): common stock 1,637,823,370; other classes: none Whether the acquisition fell short of the expected amount: -; reason for shortfall: - * The company completed the acquisition as close as possible to the expected acquisition amount disclosed in its July 31, 2026 material event report (decision to acquire treasury shares); the difference is less than the price of one share. * Due to share-price movements during the acquisition period, the actual quantity acquired (697,719 shares) differs from the originally planned quantity (1,000,000 shares).

5. Treasury-share holdings after acquisition [as of August 25, 2026] (unit: KRW, shares, %) Common stock: shares held under Article 165-3 (A): 1,292,432 (15.39%, total value 2,941,813,604); shares held under trust contracts (B): none; total (A+B): 1,292,432 (15.39%, 2,941,813,604) Total: 1,292,432 (15.39%, 2,941,813,604) * As of the filing date, total common shares outstanding is 8,396,593; the above ratio is relative to total common shares outstanding, and the total value is the treasury-share acquisition cost excluding fees.

6. Changes in the largest shareholder's shareholding before and after the acquisition [as of August 25, 2026] (unit: shares) Name: Kim In-sik; Type: Common stock; Shares held on the acquisition-report filing date: 3,921,700; Shares held on the acquisition-completion date: 3,921,700; Reason for change: none Total - Common stock: 3,921,700 / 3,921,700, no change; Other classes: none; Combined total: 3,921,700 / 3,921,700, no change