Treasury share acquisition: results report

What happened

Treasury Share Acquisition Results Report 6.0 KB Financial Group Co., Ltd. Treasury Share Acquisition Results Report To: Governor of the Financial Supervisory Service July 16, 2026 Company name: KB Financial Group Co., Ltd. CEO: Yang Jong-hee Head office address: 26 Gukjegeumyung-ro 8-gil, Yeongdeungpo-gu, Seoul (Yeouido-dong) Phone: 02-2073-7114 Website: http://www.kbfg.com Preparer: Senior Manager, Choi Young-chul, Phone: 02-2073-2823

1. Name and Address of the Issuer (a) Name: KB Financial Group Co., Ltd. (b) Address: 26 Gukjegeumyung-ro 8-gil, Yeongdeungpo-gu, Seoul (Yeouido-dong)

2. Matters Concerning the Acquisition Report (a) Material event report filing date: April 23, 2026 (b) Acquisition period: April 24, 2026 to July 14, 2026 Note: The above acquisition period is based on trade (execution) dates; the final settlement date is July 16, 2026.

3. Acquisition Details (Unit: KRW, shares) Date: 2026.04.30; Type: Common shares; Order quantity: 200,000; Acquired quantity: 200,000; Price per share: 158,917; Total acquisition amount: 31,783,321,950; Broker: KB Securities; Financial investment business ID: 00164876 Date: 2026.05.31; Type: Common shares; Order quantity: 720,000; Acquired quantity: 720,000; Price per share: 156,073; Total acquisition amount: 112,372,890,900; Broker: KB Securities; Financial investment business ID: 00164876 Date: 2026.06.30; Type: Common shares; Order quantity: 400,000; Acquired quantity: 400,000; Price per share: 158,059; Total acquisition amount: 63,223,665,150; Broker: KB Securities; Financial investment business ID: 00164876 Date: 2026.07.14; Type: Common shares; Order quantity: 2,261,788; Acquired quantity: 2,261,623; Price per share: 173,601; Total acquisition amount: 392,620,090,200; Broker: KB Securities; Financial investment business ID: 00164876 Total: Order quantity 3,581,788; Acquired quantity 3,581,623; Average price per share 167,522; Total acquisition amount 599,999,968,200 Note: The "quantity" and "total acquisition amount" above are month-to-date cumulative totals based on trade (execution) dates; the settlement date is each trade date plus 2 business days, and the treasury share acquisition completion date is July 16, 2026.

4. Agreement Between Planned and Actual Acquisition Planned acquisition amount (KRW): Common shares 600,000,000,000; Other class shares - Total acquisition amount (KRW): Common shares 599,999,968,200; Other class shares - Whether the planned acquisition amount was not met: Yes Reason if not met: Shortfall due to share-price increments

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 3,581,623; Ratio 1.01; Total value 599,999,968,200 Holdings under a trust agreement under Article 165-3 (B): Quantity -; Ratio -; Contract amount - Total (A+B): Quantity 3,581,623; Ratio 1.01; Amount 599,999,968,200 Grand total: Quantity 3,581,623; Ratio 1.01; Amount 599,999,968,200 Note 1) The company holds no treasury shares other than the 3,581,623 shares acquired this time, and "total value" is the total acquisition amount. Note 2) The above "ratio" is the ratio of treasury shares held to the company's total shares issued of 354,687,734 shares.

6. Changes in the Largest Shareholder's Holdings Before and After Acquisition [as of July 16, 2026] (Unit: shares) Name: National Pension Service; Type of shares: Common shares; Shares at acquisition report date: 33,505,649; Shares at acquisition completion date: 33,460,006; Reason for change: Confirmed via shareholder register as of 2026.5.18 Total: Common shares: 33,505,649 -> 33,460,006 Grand total: 33,505,649 -> 33,460,006 Note: The largest shareholder, the National Pension Service's shareholding at the "acquisition report date" is based on the shareholder register as of April 17, 2026, and at the "acquisition completion date" is based on the shareholder register as of May 18, 2026.