Treasury share acquisition: results report

What happened

Treasury Share Acquisition Results Report 6.0 Cas Co., Ltd. Treasury Share Acquisition Results Report To the Governor of the Financial Supervisory Service August 3, 2026

Company Name: Cas Co., Ltd. Representative Director: Kim Tae-in Head Office Address: 262 Grugogae-ro, Gwangjeok-myeon, Yangju-si, Gyeonggi-do (Phone) 031-820-1100 (Website) http://www.cas.co.kr Preparer: (Title) Executive Director (Name) Jeon Jong-il (Phone) 02-2225-3648

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

2. Details of the Acquisition Report a. Material event report submission date: July 16, 2026 b. Acquisition period: from July 20, 2026 to July 31, 2026

3. Details of Acquisition (Unit: KRW, shares) Date / Type / Order quantity / Quantity acquired / Acquisition price per share / Total acquisition value / Brokerage firm for purchase / Financial investment business entity ID 2026-07-20: common shares, 49,850, 49,822, 1,013, 50,465,371, Shinhan Investment Corp., 00138321 2026-07-21: common shares, 49,850, 49,850, 1,009, 50,281,322, Shinhan Investment Corp., 00138321 2026-07-22: common shares, 49,850, 49,850, 1,016, 50,664,010, Shinhan Investment Corp., 00138321 2026-07-23: common shares, 49,850, 49,850, 1,019, 50,813,960, Shinhan Investment Corp., 00138321 2026-07-24: common shares, 49,850, 49,850, 1,005, 50,090,956, Shinhan Investment Corp., 00138321 2026-07-27: common shares, 49,850, 49,850, 1,008, 50,225,261, Shinhan Investment Corp., 00138321 2026-07-28: common shares, 49,850, 49,850, 1,003, 50,016,593, Shinhan Investment Corp., 00138321 2026-07-29: common shares, 49,850, 49,850, 980, 48,869,759, Shinhan Investment Corp., 00138321 2026-07-30: common shares, 49,850, 49,850, 994, 49,556,967, Shinhan Investment Corp., 00138321 2026-07-31: common shares, 48,659, 48,659, 1,007, 49,015,304, Shinhan Investment Corp., 00138321 Total: order quantity 497,309; quantity acquired 497,281; acquisition price per share 1,005; total acquisition value 499,999,503

4. Whether the Planned Acquisition Matches the Actual Acquisition Planned acquisition amount (KRW) / Total acquisition value (KRW) / Whether short of planned amount / Reason for shortfall, if any Common shares: 499,999,512 / 499,999,503 / - / - Other shares: - / - / - / - The Company completed the share acquisition as close as possible to the planned acquisition amount stated in the material event report. The difference in total acquisition value is less than the price of one share. Due to price fluctuations during the treasury share acquisition period, a difference arose between the planned acquisition quantity (498,504) and the actual acquisition quantity (497,281).

5. Holding Status of Treasury Shares, etc. after Acquisition [as of August 3, 2026] (Unit: KRW, shares, %) Share type: Holdings under Article 165-3 (A) / Holdings under trust agreements under Article 165-3 (B) / Total (A+B) Common shares: quantity 2,892,524, ratio 11.26%, total value 3,615,546,984 / quantity -, ratio -, contract amount - / quantity 2,892,524, ratio 11.26%, amount 3,615,546,984 Total: quantity 2,892,524, ratio 11.26%, total value 3,615,546,984 / quantity -, ratio -, contract amount - / quantity 2,892,524, ratio 11.26%, amount 3,615,546,984 Note 1) The above total value does not include fees. Note 2) The above ratio is calculated against the total of 25,698,732 shares issued as of the date of submission.

6. Changes in Shares Held by the Largest Shareholder Before and After the Acquisition [as of August 3, 2026] (Unit: shares) Name / Share type / Shares held at acquisition report date / Shares held at acquisition completion date / Reason for change Kim Dong-jin: common shares, 5,282,555, 5,282,555, - Total: common shares, 5,282,555, 5,282,555, -; other shares, -, -, - Grand total: 5,282,555 / 5,282,555 / -