Treasury share acquisition: results report

What happened

Report on Results of Treasury Share Acquisition, version 6.0, S-Chem Co., Ltd. To the Governor of the Financial Supervisory Service, July 10, 2026 Company name: S-Chem Co., Ltd. CEO: Yeom Ho-yeong Head office address: 15 Je2 Bio Valley-ro 5-gil, Jecheon-si, Chungbuk (Phone) 043-653-6222 (Website) http://s-chem.co.kr Preparer in charge: (Title) Director (Name) Choi Gak-gyu (Phone) 043-653-6222

1. Name and address of the issuer Name: S-Chem Co., Ltd. Address: 15 Je2 Bio Valley-ro 5-gil, Jecheon-si, Chungbuk

2. Matters concerning the acquisition report Material event report filing date: May 29, 2026 Acquisition period: June 1, 2026 to July 6, 2026 (based on trade/execution dates)

3. Acquisition details (Unit: KRW, shares), Date: type, order quantity, acquired quantity, price per share, total acquisition value, broker (NH Investment & Securities, ID 00120182) for all rows: 2026-06-01: common shares, 5,000, 5,000, 4,877, 24,386,503 2026-06-02: common shares, 5,000, 5,000, 4,336, 21,684,215 2026-06-04: common shares, 10,000, 10,000, 4,555, 45,555,110 2026-06-05: common shares, 3,000, 3,000, 4,418, 13,255,755 2026-06-08: common shares, 3,000, 3,000, 4,035, 12,105,000 2026-06-09: common shares, 10,000, 10,000, 4,189, 41,899,960 2026-06-10: common shares, 3,000, 3,000, 3,992, 11,978,915 2026-06-11: common shares, 10,000, 10,000, 4,075, 40,756,570 2026-06-12: common shares, 10,000, 10,000, 4,238, 42,385,195 2026-06-15: common shares, 10,000, 10,000, 4,084, 40,842,715 2026-06-16: common shares, 10,000, 10,000, 4,136, 41,368,000 2026-06-17: common shares, 10,000, 10,000, 4,248, 42,480,270 2026-06-19: common shares, 5,000, 5,000, 3,636, 18,182,835 2026-06-22: common shares, 5,000, 5,000, 3,597, 17,987,250 2026-06-23: common shares, 3,000, 3,000, 3,437, 10,312,580 2026-06-25: common shares, 3,000, 3,000, 3,524, 10,574,970 2026-06-26: common shares, 3,000, 3,000, 3,435, 10,305,950 2026-06-29: common shares, 3,000, 3,000, 3,558, 10,675,590 2026-06-30: common shares, 3,000, 3,000, 3,553, 10,660,725 2026-07-01: common shares, 3,000, 3,000, 3,823, 11,470,985 2026-07-02: common shares, 3,000, 3,000, 3,796, 11,390,460 2026-07-03: common shares, 2,000, 2,000, 3,764, 7,528,150 2026-07-06: common shares, 560, 560, 3,950, 2,212,000 Total: 122,560 ordered, 122,560 acquired, average price 4,079, total value 499,999,703

Note: "date" is the trade (execution) date; "price per share" and "total acquisition value" exclude fees; "price per share" is the average unit price.

4. Whether the planned acquisition matches the actual acquisition Planned acquisition amount: common shares KRW 500,000,000. Actual total acquisition value: common shares KRW 499,999,703. No shortfall. The company completed the treasury share acquisition within the planned amount stated in its material event report (Decision on Treasury Share Acquisition).

5. Status of treasury share holdings after the acquisition [as of July 10, 2026] (Unit: KRW, shares, %) Common shares held under Article 165-3: 122,560 shares, 1.55%, total value 499,999,703. No shares held under a trust contract. Total: 122,560 shares, 1.55%, KRW 499,999,703.

6. Changes in the largest shareholder's shareholding before and after the acquisition [as of July 10, 2026] (Unit: shares) Yeom Ho-yeong: common shares held before 1,358,303; after 1,358,303; no change. Total: common shares 1,358,303 before and after; no change.