Treasury share acquisition: results report

What happened

Treasury Share Acquisition Results Report 6.0 Cas Co., Ltd. Treasury Share Acquisition Results Report To: Governor of the Financial Supervisory Service July 16, 2026 Company name: Cas Co., Ltd. CEO: Kim Tae-in Head office address: 262 Geurugogae-ro, Gwangjeok-myeon, Yangju-si, Gyeonggi-do Phone: 031-820-1100 Website: http://www.cas.co.kr Preparer: Managing Director, Jeon Jong-il, Phone: 02-2225-3648

1. Name and Address of the Issuer (a) Name: Cas Co., Ltd. (b) Address: 262 Geurugogae-ro, Gwangjeok-myeon, Yangju-si, Gyeonggi-do

2. Matters Concerning the Acquisition Report (a) Material event report filing date: July 1, 2026 (b) Acquisition period: July 2, 2026 to July 15, 2026

3. Acquisition Details (Unit: KRW, shares) Date: 2026-07-02; Type: Common shares; Order quantity: 75,268; Acquired quantity: 75,268; Price per share: 968; Total acquisition amount: 72,826,239; Broker: Shinhan Investment Corp; Financial investment business ID: 00138321 Date: 2026-07-03; Type: Common shares; Order quantity: 75,268; Acquired quantity: 75,268; Price per share: 966; Total acquisition amount: 72,700,442; Broker: Shinhan Investment Corp; Financial investment business ID: 00138321 Date: 2026-07-06; Type: Common shares; Order quantity: 75,268; Acquired quantity: 75,268; Price per share: 959; Total acquisition amount: 72,182,012; Broker: Shinhan Investment Corp; Financial investment business ID: 00138321 Date: 2026-07-07; Type: Common shares; Order quantity: 75,268; Acquired quantity: 75,268; Price per share: 954; Total acquisition amount: 71,800,189; Broker: Shinhan Investment Corp; Financial investment business ID: 00138321 Date: 2026-07-08; Type: Common shares; Order quantity: 75,268; Acquired quantity: 75,268; Price per share: 965; Total acquisition amount: 72,630,056; Broker: Shinhan Investment Corp; Financial investment business ID: 00138321 Date: 2026-07-09; Type: Common shares; Order quantity: 75,268; Acquired quantity: 75,268; Price per share: 956; Total acquisition amount: 71,985,763; Broker: Shinhan Investment Corp; Financial investment business ID: 00138321 Date: 2026-07-10; Type: Common shares; Order quantity: 75,268; Acquired quantity: 75,268; Price per share: 958; Total acquisition amount: 72,110,093; Broker: Shinhan Investment Corp; Financial investment business ID: 00138321 Date: 2026-07-13; Type: Common shares; Order quantity: 75,268; Acquired quantity: 67,915; Price per share: 979; Total acquisition amount: 66,458,140; Broker: Shinhan Investment Corp; Financial investment business ID: 00138321 Date: 2026-07-14; Type: Common shares; Order quantity: 75,268; Acquired quantity: 75,268; Price per share: 1,010; Total acquisition amount: 76,022,367; Broker: Shinhan Investment Corp; Financial investment business ID: 00138321 Date: 2026-07-15; Type: Common shares; Order quantity: 50,802; Acquired quantity: 50,802; Price per share: 1,009; Total acquisition amount: 51,284,511; Broker: Shinhan Investment Corp; Financial investment business ID: 00138321 Total: Order quantity 728,214; Acquired quantity 720,861; Average price per share 971; Total acquisition amount 699,999,812

4. Agreement Between Planned and Actual Acquisition Planned acquisition amount (KRW): Common shares 699,999,840; Other class shares - Total acquisition amount (KRW): Common shares 699,999,812; Other class shares - Whether the planned acquisition amount was not met: - Reason if not met: - Note: The company completed the share acquisition as close as possible to the planned acquisition amount stated in the material event report; the difference between the planned amount and the total acquisition amount is less than the price of one share. Note: Due to share-price movements during the acquisition period, there was a difference between the planned acquisition quantity (752,688 shares) and the actual acquired quantity (720,861 shares).

5. Treasury Shares Held After Acquisition [as of July 16, 2026] (Unit: KRW, shares, %) Type of shares: Common shares Holdings under Article 165-3 (A): Quantity 3,190,049; Ratio 12.04; Total value 4,171,049,849 Holdings under a trust agreement under Article 165-3 (B): Quantity -; Ratio -; Contract amount - Total (A+B): Quantity 3,190,049; Ratio 12.04; Amount 4,171,049,849 Grand total: Quantity 3,190,049; Ratio 12.04; Amount 4,171,049,849 Note 1) The above "total value" does not include brokerage fees. Note 2) The above "ratio" is relative to total shares issued of 26,493,538 shares.

6. Changes in the Largest Shareholder's Holdings Before and After Acquisition [as of July 16, 2026] (Unit: shares) Name: Kim Dong-jin; Type of shares: Common shares; Shares at acquisition report date: 5,282,555; Shares at acquisition completion date: 5,282,555; Reason for change: - Total: Common shares: 5,282,555 -> 5,282,555; Other class shares: - -> - Grand total: 5,282,555 -> 5,282,555