KB 0001193125-26-313193 6-K Filing: Jul 23, 2026

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of July 2026

Commission File Number: 000-53445

KB Financial Group Inc.

(Translation of registrant’s name into English)

26, Gukjegeumyung-ro 8-gil, Yeongdeungpo-gu, Seoul 07331, Korea

(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F ☒ Form 40-F ☐

Preliminary Operating Results for the First Half of 2026

On July 23, 2026, KB Financial Group Inc. (“KB Financial Group”) held an earnings conference and released its preliminary operating results for the first half of fiscal year 2026. The following tables reflect the key figures released during the conference. The presentation materials for the conference, which contain further details, are available at KB Financial Group’s website (http://www.kbfg.com).

The preliminary figures presented herein are based on International Financial Reporting Standards as adopted by the Republic of Korea (“K-IFRS”) and are currently being reviewed by KB Financial Group’s independent auditors and are therefore subject to change.

1.	Preliminary Operating Results of KB Financial Group (Consolidated)
(Won in millions, %)				2Q 2026			1Q 2026		% Change<br>Increase<br>(Decrease)<br><br>(Q to Q)		2Q 2025			% Change<br>Increase<br>(Y to Y)
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Operating revenue		Specified Quarter			31,757,381		30,698,923		3.45			24,200,489			31.23
		Cumulative			62,456,304		—		—			43,944,457			42.13
Net operating profit		Specified Quarter			2,712,548		2,727,566		(0.55)			2,132,971			27.17
		Cumulative			5,440,114		—		—			4,425,999			22.91
Profit before income tax		Specified Quarter			2,732,758		2,631,140		3.86			2,343,141			16.63
		Cumulative			5,363,898		—		—			4,649,747			15.36
Profit for the period		Specified Quarter			2,010,508		1,916,469		4.91			1,747,580			15.05
		Cumulative			3,926,977		—		—			3,446,702			13.93
Profit attributable to shareholders of the parent company		Specified Quarter			1,992,189		1,892,401		5.27			1,738,422			14.60
		Cumulative			3,884,590		—		—			3,435,693			13.07
Notes: 1)	“Operating revenue” represents the sum of interest income, fee and commission income, insurance<br>income, reinsurance income, gain on financial assets/liabilities at fair value through profit or loss, other insurance finance income and other operating income.
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2.	Preliminary Operating Results of Kookmin Bank (Consolidated)
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(Won in millions, %)				2Q 2026			1Q 2026		% Change<br>Increase<br>(Decrease)<br><br>(Q to Q)		2Q 2025			% Change<br>Increase<br>(Decrease)<br>(Y to Y)
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Operating revenue		Specified Quarter			11,750,941		15,917,918		(26.18)			14,169,626			(17.07	)
		Cumulative			27,668,859		—		—			24,981,037			10.76
Net operating profit		Specified Quarter			1,505,435		1,624,950		(7.35)			1,556,425			(3.28	)
		Cumulative			3,130,385		—		—			2,945,334			6.28
Profit before income tax		Specified Quarter			1,509,062		1,517,739		(0.57)			1,537,223			(1.83	)
		Cumulative			3,026,801		—		—			2,911,248			3.97
Profit for the period		Specified Quarter			1,124,017		1,100,225		2.16			1,152,065			(2.43	)
		Cumulative			2,224,242		—		—			2,169,840			2.51
Profit attributable to shareholders of the parent company		Specified Quarter			1,124,363		1,101,039		2.12			1,161,173			(3.17	)
		Cumulative			2,225,402		—		—			2,187,605			1.73
Note: 1)	“Operating revenue” represents the sum of interest income, fee and commission income, gain on<br>financial assets/liabilities at fair value through profit or loss and other operating income.
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3.	Preliminary Operating Results of KB Securities Co., Ltd. (“KB Securities”) (Consolidated)
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(Won in millions, %)			2Q 2026			1Q 2026			% Change<br>Increase<br>(Q to Q)			2Q 2025			% Change<br>Increase<br>(Y to Y)
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Operating revenue	Specified Quarter			12,277,934			8,350,937			47.02			3,216,537			281.71
	Cumulative			20,628,871			—			—			6,204,824			232.47
Net operating profit	Specified Quarter			600,609			453,114			32.55			218,043			175.45
	Cumulative			1,053,723			—			—			442,654			138.05
Profit before income tax	Specified Quarter			608,585			471,405			29.10			221,672			174.54
	Cumulative			1,079,989			—			—			460,520			134.52
Profit for the period	Specified Quarter			450,769			350,235			28.70			160,658			180.58
	Cumulative			801,004			—			—			342,361			133.96
Profit attributable to shareholders of the parent company	Specified Quarter			449,886			349,095			28.87			160,335			180.59
	Cumulative			798,982			—			—			341,597			133.90
Notes: 1)	The above figures are based on KB Securities’ consolidated financial statements, as a result of which the<br>figures may differ from KB Securities’ earnings results to be released at KB Financial Group’s earnings conference for the first half of fiscal year of 2026, which are based on KB Financial Group’s consolidated financial<br>statements.
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2)	“Operating revenue” represents operating income based on KB Securities’ financial statements.
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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	KB Financial Group Inc.
	(Registrant)
Date: July 23, 2026	By: /s/ Sang Rok Na
	(Signature)
	Name: Sang Rok Na
	Title: Senior Managing Director and Chief Financial Officer

KB 6-K