Changes in the Number of Shares Owned by the Largest Shareholder of KB Financial Group Inc.

On May 18, 2026, KB Financial Group Inc. reported a change in the number of shares owned by its largest shareholder, the Korean National Pension Service. As of March 31, 2026, the National Pension Service held 33,505,649 shares, representing 8.99% of the total shares. By May 8, 2026, the shareholding decreased to 33,460,006 shares, which constituted 8.97% of the total 372,850,455 shares. This filing is made pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934.