It is one of the domestic systemically important banks (D-SIBs) identified by the Financial Services Commission.

[2] KB Financial Group was established through the restructuring of Kookmin Bank into a holding company in September 2008.

Kookmin Bank launched a financial holding firm to boost non-banking operations such as brokerage, insurance, and consumer finance.

[3][4] After its establishment, KB acquired non-banking financial services companies, including LIG Insurance, Hyundai Securities, Prudential Life Korea, etc.

In 2020, KB reinforced its life insurance business by acquiring a 100% stake in Prudential Financial Inc's South Korean unit for 2.3 trillion won.