Report regarding addition of a new subsidiary

On May 4, 2009, KB Financial Group Inc. (“KB Financial Group”) disclosed that it
had added Kookmin Bank Cambodia PLC as a second-tier subsidiary. Key details are
as follows:

1. Information regarding the new second-tier subsidiary:

   - Company name: Kookmin Bank Cambodia PLC (formerly Khmer Union Bank)
   - Key financial figures (as of December 31, 2008):
     o Total Assets (KRW): 16,992,769,101
     o Total Liabilities (KRW): 13,335,767
     o Total Stockholders’ Equity (KRW): 16,979,433,334
     o Capital Stock (KRW): 16,994,900,000
   - Primary area of business: Banking business

2. Reason for change: Kookmin Bank, a wholly-owned subsidiary of KB Financial
Group, acquired 51% of the outstanding shares of Khmer Union Bank (which was
subsequently renamed Kookmin Bank Cambodia PLC).

3. Total number of subsidiaries of KB Financial Group after addition of Kookmin
Bank Cambodia PLC as a second-tier subsidiary: 15

4. Date of change: May 4, 2009

5. Other relevant information:

   - The key financial figures above are based on the exchange rate as of
     May 4, 2009 (USD 1.00 = KRW 1,307.30)