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 2013

Commission File Number: 000-53445

KB Financial Group Inc.

(Translation of registrant’s name into English)

9-1, 2-ga, Namdaemoon-ro, Jung-gu, Seoul 100-703, 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  x            Form 40-F  ¨

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1):  ¨

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7):  ¨

Indicate by check mark whether the registrant by furnishing the information contained in this Form is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.

Yes  ¨             No  x

If “Yes” is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b): 82-N/A.

2013 First Half Preliminary Operating Results

On July 26, 2013, KB Financial Group Inc. (“KB Financial Group”) held an earnings conference and released its preliminary operating results for the first half of fiscal year 2013. 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 the International Financial Reporting Standards as adopted by the Republic of Korea (“K-IFRS”) and are currently being reviewed by our independent auditor and are subject to change.

1. Preliminary Operating Results of KB Financial Group (Consolidated)

(Won in millions, %)		2Q 2013		1Q 2013		% Change Increase (Decrease) (Q to Q)			2Q 2012*		%  Change Increase (Decrease) (Y to Y)
Operating revenue**	Specified Quarter		5,978,021		6,202,554		(3.62	)		6,128,247		(2.45	)
	Cumulative		12,180,575		6,202,554		—			13,049,539		(6.66	)
Net operating profit	Specified Quarter		451,495		532,865		(15.27	)		747,270		(39.58	)
	Cumulative		984,360		532,865		—			1,556,681		(36.77	)
Profit before income tax	Specified Quarter		323,403		547,736		(40.96	)		736,374		(56.08	)
	Cumulative		871,139		547,736		—			1,544,365		(43.59	)
Profit for the period	Specified Quarter		165,258		412,916		(59.98	)		553,299		(70.13	)
	Cumulative		578,174		412,916		—			1,161,945		(50.24	)
Profit attributable to shareholders of the parent company	Specified Quarter		163,520		411,458		(60.26	)		551,613		(70.36	)
	Cumulative		574,978		411,458		—			1,156,552		(50.29	)

* The figures have been restated to reflect adjustments resulting from retrospective application of the amendments to K-IFRS that are effective for the financial year beginning on or after January 1, 2013.

** Represents the sum of interest income, fee and commission income, gain on financial assets/liabilities at fair value through profit or loss, and other operating income.

2. Preliminary Operating Results of Kookmin Bank (Consolidated)

(Won in millions, %)		2Q 2013		1Q 2013		% Change Increase (Decrease) (Q to Q)			2Q 2012*		%  Change Increase (Decrease) (Y to Y)
Operating revenue**	Specified Quarter		4,633,834		4,862,670		(4.71	)		4,499,323		2.99
	Cumulative		9,496,504		4,862,670		—			9,711,440		(2.21	)
Net operating profit	Specified Quarter		293,671		376,063		(21.91	)		646,728		(54.59	)
	Cumulative		669,734		376,063		—			1,338,037		(49.95	)
Profit before income tax	Specified Quarter		168,666		391,090		(56.87	)		638,944		(73.60	)
	Cumulative		559,756		391,090		—			1,330,968		(57.94	)
Profit for the period	Specified Quarter		48,822		295,857		(83.50	)		478,274		(89.79	)
	Cumulative		344,679		295,857		—			1,004,707		(65.69	)
Profit attributable to shareholders of the parent company	Specified Quarter		48,783		295,812		(83.51	)		478,129		(89.80	)
	Cumulative		344,595		295,812		—			1,004,423		(65.69	)

* The figures have been restated to reflect adjustments resulting from retrospective application of the amendments to K-IFRS that are effective for the financial year beginning on or after January 1, 2013.

** Represents the sum of interest income, fee and commission income, gain on financial assets/liabilities at fair value through profit or loss, and other operating income.

3. Preliminary Operating Results of KB Kookmin Card Co., Ltd. (Consolidated)

(Won in millions, %)		2Q 2013		1Q 2013		% Change Increase (Decrease) (Q to Q)		2Q 2012*		%  Change Increase (Decrease) (Y to Y)
Operating revenue**	Specified Quarter		739,522		714,376		3.52		717,321		3.09
	Cumulative		1,453,898		714,376		—		1,440,571		0.93
Net operating profit	Specified Quarter		141,053		124,738		13.08		60,166		134.44
	Cumulative		265,791		124,738		—		153,051		73.66
Profit before income tax	Specified Quarter		141,068		124,760		13.07		60,559		132.94
	Cumulative		265,828		124,760		—		153,679		72.98
Profit for the period	Specified Quarter		108,011		95,588		13.00		45,805		135.81
	Cumulative		203,599		95,588		—		116,974		74.05
Profit attributable to shareholders of the parent company	Specified Quarter		108,011		95,588		13.00		45,805		135.81
	Cumulative		203,599		95,588		—		116,974		74.05

* The figures have been restated to reflect adjustments resulting from retrospective application of the amendments to K-IFRS that are effective for the financial year beginning on or after January 1, 2013.

** Represents the sum of interest income, fee and commission income, and other operating income.

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 26, 2013	By: /s/ Woong-Won Yoon
	(Signature)
	Name:	Woong-Won Yoon
	Title:	Deputy President & CFO