6-K - KB - Equibles

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 April 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 Quarter of 2026

On April 23, 2026, KB Financial Group Inc. (“KB Financial Group”) held an earnings conference and released its preliminary operating results for the first quarter 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, %)				1Q 2026			4Q 2025			% ChangeIncrease<br><br><br>(Q to Q)			1Q 2025			% ChangeIncrease<br><br><br>(Y to Y)
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Operating revenue		Specified Quarter			30,698,923			22,461,380			36.67			19,743,968			55.49
		Cumulative			30,698,923			81,378,164			—			19,743,968			55.49
Net operating profit		Specified Quarter			2,727,566			1,756,722			55.26			2,293,028			18.95
		Cumulative			2,727,566			8,517,711			—			2,293,028			18.95
Profit before income tax		Specified Quarter			2,631,140			1,271,966			106.86			2,306,606			14.07
		Cumulative			2,631,140			8,183,146			—			2,306,606			14.07
Profit for the period		Specified Quarter			1,916,469			738,785			159.41			1,699,122			12.79
		Cumulative			1,916,469			5,840,715			—			1,699,122			12.79
Profit attributable to shareholders of the parent company		Specified Quarter			1,892,401			711,429			166.00			1,697,271			11.50
		Cumulative			1,892,401			5,833,162			—			1,697,271			11.50
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, %)				1Q 2026			4Q 2025			% ChangeIncrease			1Q 2025			% ChangeIncrease
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Operating revenue		Specified<br>Quarter			15,917,918			11,102,884			43.37			10,811,411			47.23
		Cumulative			15,917,918			42,528,587			—			10,811,411			47.23
Net operating profit		Specified<br>Quarter			1,624,950			1,201,590			35.23			1,388,909			16.99
		Cumulative			1,624,950			5,720,776			—			1,388,909			16.99
Profit before income tax		Specified<br>Quarter			1,517,739			825,041			83.96			1,374,025			10.46
		Cumulative			1,517,739			5,315,219			—			1,374,025			10.46
Profit for the period		Specified<br>Quarter			1,100,225			479,651			129.38			1,017,775			8.10
		Cumulative			1,100,225			3,824,819			—			1,017,775			8.10
Profit attributable to shareholders of the parent company		Specified<br>Quarter			1,101,039			487,618			125.80			1,026,432			7.27
		Cumulative			1,101,039			3,852,166			—			1,026,432			7.27
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, %)				1Q 2026			4Q 2025			% ChangeIncrease<br><br><br>(Q to Q)			1Q 2025			% ChangeIncrease<br><br><br>(Y to Y)
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Operating revenue		Specified<br>Quarter			8,350,937			5,196,935			60.69			2,988,287			179.46
		Cumulative			8,350,937			14,148,226			—			2,988,287			179.46
Net operating profit		Specified<br>Quarter			453,114			243,652			85.97			224,611			101.73
		Cumulative			453,114			911,571			—			224,611			101.73
Profit before income tax		Specified<br>Quarter			471,404			232,983			102.33			238,848			97.37
		Cumulative			471,404			906,891			—			238,848			97.37
Profit for the period		Specified<br>Quarter			350,235			179,958			94.62			181,703			92.75
		Cumulative			350,235			682,386			—			181,703			92.75
Profit attributable to shareholders of the parent company		Specified<br>Quarter			349,096			178,968			95.06			181,262			92.59
		Cumulative			349,096			679,737			—			181,262			92.59
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 quarter 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.<br>
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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: April 23, 2026	By:	/s/ Sang Rok Na
		(Signature)
		Name: Sang Rok Na
		Title: Senior Managing Director and Chief Financial Officer