Report of Foreign Issuer (6-k)

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 2017

Woori Bank

(Translation of registrant’s name into English)

51, Sogong-ro, Jung-gu, Seoul, 04632, 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 ☐

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):

Note: Regulation S-T Rule 101(b)(1) only permits the submission in paper of a Form 6-K if submitted solely to provide an attached annual report to security holders.

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):

Note: Regulation S-T Rule 101(b)(7) only permits the submission in paper of a Form 6-K if submission to furnish a report or other document that the registration foreign private issuer must furnish and make public under the laws of the jurisdiction in which the registrant is incorporated, domiciled or legally organized (the registrant’s “home country”), or under the rules of the home country exchange on which the registrant’s securities are traded, as long as the report or other document is not a press release, is not required to be and has not been distributed to the registrant’s security holders, and if discussing a material event, has already been the subject of a Form 6-K submission or other Commission filing on EDGAR.

Woori Bank’s Preliminary Financial Performance Figures

for the First Half of 2017

The preliminary financial performance figures for Woori Bank for the six-month period ended June 30, 2017, on a consolidated basis, are as follows.

(Units: millions of KRW, %)


Item		1H 2017		2H 2016		% Change Increase (Decrease)		1H 2016		% Change Increase (Decrease)

Revenue*	Specified Half		11,988,633		11,355,196		5.58		12,243,074		(2.08	)
Revenue*	Cumulative Basis		11,988,633		23,598,270		—		12,243,074		—

Operating Income	Specified Half		1,485,290		625,102		137.61		949,103		56.49
Operating Income	Cumulative Basis		1,485,290		1,574,205		—		949,103		—

Income before	Specified Half		1,429,953		642,268		122.64		911,121		56.94
Income Tax Expense	Cumulative Basis		1,429,953		1,553,389		—		911,121		—

Net Income	Specified Half		1,108,925		519,747		113.36		757,787		46.34
Net Income	Cumulative Basis		1,108,925		1,277,534		—		757,787		—

Profit to the Equity Holders of the Parent Entity	Specified Half Cumulative Basis		1,098,318 1,098,318		511,000 1,261,266		114.94 —		750,266 750,266		46.39 —

*	Represents the sum of interest income, fee and commission income, dividend income, gain on financial assets and other operating income (excluding non-operating income).

The above figures are prepared in accordance with Korean International Financial Reporting Standards.

The figures above are subject to adjustment as they are preliminary and have not been reviewed by our independent auditors.

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.