NBGIF National Bank of Greece SA (PK)

FORM 6-K

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Report of Foreign Private Issuer

Pursuant to rule 13a-16 or 15d-16 of

The Securities Exchange Act of 1934

For the month of December , 2017

National Bank of Greece S.A.

(Translation of registrant’s name into English)

86 Eolou Street, 10232 Athens, Greece

(Address of principal executive offices)

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

Form 20-F         x         Form 40-F         o

[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         o         No         x        

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

NATIONAL BANK OF GREECE S.A.

Athens — 1 December 2017

NBG Group announces the completion of the sale of its Serbian Operations

National Bank of Greece S.A. (“NBG”) announces the completion of the sale of its 100% stake in its Serbian subsidiaries Vojvodjanska Banka AD (“VOBAN”) and NBG Leasing doo (“NBG Leasing”) for a consideration of €125 million and of a portfolio of Serbian-risk corporate loans (together the “Transaction”), following receipt of the required regulatory and anti-trust approvals.

The consideration represents a multiple of c. 0.75x P/TBV(1) .The successful completion of the Transaction increases NBG’s Q3.17 CET1 Ratio by +44bps, following the capital impact already booked in Q2.17 upon signing of the Transaction. The positive impact on NBG’s Group Liquidity, including repayment of intra-group debt, is c. €270 million.

Credit Suisse International acted as exclusive financial advisor to NBG. Freshfields Bruckhaus Deringer acted as international legal counsel and Bojovic & Partners as local legal counsel to NBG.

Note 1: Based on the Tangible Book Value of 31.12.2016

2