Treasury share acquisition: results report

What happened

Treasury Share Acquisition: Results Report 6.0 Omnisystem Co., Ltd.

To: Governor of the Financial Supervisory Service Date: July 20, 2026 Company name: Omnisystem Co., Ltd. Representative director: Park Hye-rin Head office address: 284 Yeonsam-ro, Ganam-eup, Yeoju-si, Gyeonggi-do Phone: 031-883-5400 Website: http://www.omnisystem.co.kr Preparer: Vice Chairman Yoon Ho-kwon, Phone: 031-883-5400

1. Name and address of the issuer (a) Name: Omnisystem Co., Ltd. (b) Address: 284 Yeonsam-ro, Ganam-eup, Yeoju-si, Gyeonggi-do

2. Matters concerning the acquisition report (a) Material event report filing date: June 12, 2026 (b) Acquisition period: June 16, 2026 to July 15, 2026 (based on the trade execution date)

3. Acquisition details (Unit: KRW, shares; all through Daishin Securities, ID 00110893) 2026-06-16: order 150,000; acquired 150,000; price 789; amount 118,352,099 2026-06-17: order 150,000; acquired 100,251; price 889; amount 89,122,410 2026-06-18: order 150,000; acquired 60,000; price 888; amount 53,279,169 2026-06-19: order 100,000; acquired 100,000; price 869; amount 86,938,510 2026-06-22: order 100,000; acquired 100,000; price 865; amount 86,500,077 2026-06-23: order 150,000; acquired 150,000; price 856; amount 128,350,435 2026-06-24: order 150,000; acquired 150,000; price 813; amount 121,917,222 2026-06-25: order 150,000; acquired 130,082; price 804; amount 104,643,987 2026-06-26: order 150,000; acquired 150,000; price 794; amount 119,097,773 2026-06-29: order 150,000; acquired 150,000; price 829; amount 124,355,923 2026-06-30: order 150,000; acquired 150,000; price 806; amount 120,863,119 2026-07-01: order 150,000; acquired 150,000; price 846; amount 126,894,360 2026-07-02: order 150,000; acquired 150,000; price 850; amount 127,525,331 2026-07-03: order 150,000; acquired 116,557; price 850; amount 99,030,935 2026-07-06: order 150,000; acquired 150,000; price 884; amount 132,596,645 2026-07-07: order 150,000; acquired 150,000; price 844; amount 126,548,569 2026-07-08: order 150,000; acquired 150,000; price 820; amount 123,050,047 2026-07-09: order 100,000; acquired 100,000; price 802; amount 80,188,383 2026-07-10: order 30,000; acquired 30,000; price 860; amount 25,806,416 2026-07-13: order 5,000; acquired 5,000; price 885; amount 4,425,000 2026-07-14: order 510; acquired 510; price 889; amount 453,195 2026-07-15: order 67; acquired 67; price 907; amount 60,769 Total: order 2,585,577; acquired 2,392,467; average price 836; total amount 2,000,000,374 Note: The dates above are based on the trade execution date. The price per share and total acquisition amount do not include brokerage commissions.

4. Whether the planned acquisition matches the actual acquisition Planned acquisition amount (KRW): Common shares 2,000,000,000; Other shares: none Total acquisition amount (KRW): Common shares 2,000,000,374; Other shares: none Note: The Company completed the acquisition as close as possible to the planned amount stated in its material event report; the difference is attributable to per-share price rounding. Note: Due to share-price movements during the acquisition period, a difference arose between the planned acquisition quantity (3,194,888 shares) and the actual acquisition quantity (2,392,467 shares).

5. Treasury share holdings after the acquisition [as of July 20, 2026] (Unit: KRW, shares, %) Holdings under Article 165-3 of the Act (A): quantity 2,392,467; ratio 4.03%; total value 2,002,000,365 Holdings under a trust agreement per Article 165-3 (B): none Total (A+B): quantity 2,392,467; ratio 4.03%; amount 2,002,000,365 Note: The total value and amount above are on a book-value basis including brokerage commissions.

6. Changes in the largest shareholder's shareholding before and after the acquisition [as of July 20, 2026] (Unit: shares) Name: BioSmart Co., Ltd.; Share type: common shares; Shares as of the acquisition report date: 13,889,705; Shares as of the end of the acquisition period: 16,025,169; Reason for change: open-market purchase Total: common shares 13,889,705 -> 16,025,169; grand total 13,889,705 -> 16,025,169 Note: The "end of acquisition period" figure is based on the trade execution (purchase) date. BioSmart Co., Ltd. filed a trading plan report (June 12, 2026) and has been purchasing the Company's shares on the open market under that plan, not yet complete as of this report.