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~~January, ~~2018~~2019

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,~~REPLY 5TO ~~December 2018~~HELLENIC CAPITAL MARKET COMMISSION

~~Notification~~Athens, ~~of important changes concerning voting rights under article 7a par. 6 case c of L. 3864~~04/~~2010~~01/2019

In reply to a relevant question by the Hellenic Capital Market Commission, we hereby inform investors that National Bank of Greece ~~S.A.~~SA (~~“the~~NBG) ~~Bank”~~and INVEL Group today (4/1/2019) ~~announces~~made ~~according~~a second amendment to ~~article~~the 7aShareholders’ ~~par~~Agreement between the two entities, as first signed on 30.12.2013 6and ~~case~~amended con 18.8.2015. The matter of Lthis amendment agreement was the extension of the duration of the said Shareholders’ Agreement by three months, i.e. ~~3864~~from 31/~~2010,~~12/2018 to 31/3/2019. This extension of the ~~following:~~said Agreement also implies the corresponding extension of INVEL’s call option on the shares held by NBG at the weighted average price of NBG Pangaea REIC in the last quarter of 2018 and on the basis of the other terms and conditions set out in the Shareholders’ Agreement, as applicable after this latest amendment.

~~Following~~The asaid ~~relevant~~extension ~~notification~~of ~~that~~ the ~~Bank~~duration ~~received~~of ~~from Blackrock, Inc. on 03.12.2018,~~ the ~~total~~Shareholders’ ~~percentage~~Agreement offor ~~voting~~a ~~rights~~three-month ~~that~~period ~~correspond~~implies toalso ancontinuation ~~equal amount~~ of ~~common,~~NBG’s ~~registered~~control, ~~voting,~~over ~~dematerialized shares, as well as other financial instruments that provide~~ the ~~right~~same ~~to acquire shares which incorporate voting rights held indirectly by Blackrock~~period, ~~Inc.~~ ~~fell, as~~ of ~~30.11.2018~~Pangaea, ~~below~~under the ~~minimum~~terms ~~threshold~~stipulated ofin ~~5% of~~ the ~~total~~relevant ~~voting~~provisions ~~rights~~ of the ~~Bank,~~Shareholders’ ~~excluding common~~Agreement, ~~registered,~~as ~~voting~~published ~~shares~~each ~~held~~year byin the ~~HFSF,~~financial ~~which~~statements ~~are subject to the restrictions~~ of ~~article~~NBG 7aPangaea ~~of L~~REIC. ~~3864/2010.~~

InThe ~~the~~rumors ~~table~~recently ~~below~~circulated in the ~~data~~online ~~regarding~~press about the ~~chain~~supposed signing of ~~controlled~~an ~~undertakings,~~amendment ~~through~~to ~~which~~ the ~~above~~Shareholders’ ~~voting~~Agreement ~~rights~~one ~~are~~year ~~held~~ago, ~~are~~by ~~presented,~~which inNBG ~~accordance~~retains ~~with~~control ~~Article 14~~of ~~par.~~Pangaea 1if ~~case~~it bholds more than 20% of L.Pangaea’s ~~3556/2007~~stock and the call option price on the shares held by NBG is amended, are totally inaccurate.

Name	% of voting rights if it equals or is higher than the notifiable threshold	% of voting rights through financial instruments if it equals or is higher than the notifiable threshold	Total of both if it equals or is higher than the notifiable threshold
BlackRock, Inc.
BlackRock Holdco 2, Inc.
BlackRock Financial Management, Inc.
BlackRock International Holdings, Inc.
BR Jersey International Holdings LP.
BlackRock (Singapore) Holdco Pte. Ltd.
BlackRock HK Holdco Limited
BlackRock Lux Finco S.a.r.l.

BlackRock Trident Holding Company Limited
BlackRock Japan Holdings GK
BlackRock Japan Co., Ltd.	Below 5%	Below 5%	Below 5%
BlackRock, Inc.
BlackRock Holdco 2, Inc.
BlackRock Financial Management, Inc.
BlackRock International Holdings, lnc.
BR Jersey International Holdings LP.
BlackRock Holdco 3, LLC
BlackRock Cayman 1 LP
BlackRock Cayman West Bay Finco Limited
BlackRock Cayman West Bay IV Limited
BlackRock Group Limited
BlackRock Finance Europe Limited
BlackRock lnvestment Management (UK) Limited	Below 5%	Below 5%	Below 5%
BlackRock, Inc.
BlackRock Holdco 2, Inc.
BlackRock Financial Management, Inc.
BlackRock International Holdings, Inc.
BR Jersey International Holdings LP.
BlackRock Australia Holdco Pty. Ltd.
BlackRock Investment Management (Australia) Limited	Below 5%	Below 5%	Below 5%
BlackRock, Inc.
BlackRock Holdco 2, Inc.
BlackRock Financial Management, Inc.
BlackRock Holdco 4, LLC
BlackRock Holdco 6, LLC
BlackRock Delaware Holdings Inc.
BlackRock Institutional Trust Company, National Association	Below 5%	Below 5%	Below 5%
BlackRock, Inc.
BlackRock Holdco 2, Inc.
BlackRock Financial Management, Inc.
BlackRock Holdco 4, LLC
BlackRock Holdco 6, LLC
BlackRock Delaware Holdings Inc.
BlackRock Fund Advisors	Below 5%	Below 5%	Below 5%
BlackRock, Inc.
BlackRock Holdco 2, Inc.

BlackRock Financial Management, Inc.	Below 5%	Below 5%	Below 5%
BlackRock, Inc.
BlackRock Holdco 2, Inc.
BlackRock Financial Management, Inc.
BlackRock International Holdings, Inc.
BR Jersey International Holdings LP.
BlackRock (Singapore) Holdco Pte. Ltd.
BlackRock HK Holdco Limited
BlackRock Asset Management North Asia Limited	Below 5%	Below 5%	Below 5%
BlackRock, Inc.
BlackRock Holdco 2, Inc.
BlackRock Financial Management, Inc.
BlackRock Capital Holdings, Inc.
BlackRock Advisors, LLC	Below 5%	Below 5%	Below 5%
BlackRock, Inc.
BlackRock Holdco 2, Inc.
BlackRock Financial Management, Inc.
BlackRock International Holdings, Inc.
BR Jersey International Holdings LP.
BlackRock Holdco 3, LLC
BlackRock Cayman 1 LP
BlackRock Cayman West Bay Finco Limited
BlackRock Cayman West Bay IV Limited
BlackRock Group Limited
BlackRock Finance Europe Limited
BlackRock Advisors (UK) Limited	Below 5%	Below 5%	Below 5%

NATIONAL BANK OF GREECE

Athens, 5 December 2018

Notification of important changes concerning voting rights under article 14 of L. 3556/2007

National Bank of Greece S.A. (“the Bank”) announces according to article 14 of L. 3556/2007, the following:

Following a relevant notification that the Bank received from Blackrock, Inc. on 03.12.2018, the total percentage of voting rights that correspond to an equal amount of common, registered, voting, dematerialized shares, as well as other financial instruments that provide the right to acquire shares which incorporate voting rights held indirectly by Blackrock, Inc. fell, as of 30.11.2018, below the minimum threshold of 5% of the total voting rights of the Bank.

In the table below the data regarding the chain of controlled undertakings, through which the above voting rights are held, are presented, in accordance with Article 14 par. 1 case b of L. 3556/2007.

Name	% of voting rights if it equals or is higher than the notifiable threshold	% of voting rights through financial instruments if it equals or is higher than the notifiable threshold	Total of both if it equals or is higher than the notifiable threshold
BlackRock, Inc.
BlackRock Holdco 2, Inc.
BlackRock Financial Management, Inc.
BlackRock International Holdings, Inc.
BR Jersey International Holdings LP.
BlackRock (Singapore) Holdco Pte. Ltd.
BlackRock HK Holdco Limited
BlackRock Lux Finco S.a.r.l.
BlackRock Trident Holding Company Limited
BlackRock Japan Holdings GK
BlackRock Japan Co., Ltd.	Below 5%	Below 5%	Below 5%

BlackRock, Inc.
BlackRock Holdco 2, Inc.
BlackRock Financial Management, Inc.
BlackRock International Holdings, lnc.
BR Jersey International Holdings LP.
BlackRock Holdco 3, LLC
BlackRock Cayman 1 LP
BlackRock Cayman West Bay Finco Limited
BlackRock Cayman West Bay IV Limited
BlackRock Group Limited
BlackRock Finance Europe Limited
BlackRock lnvestment Management (UK) Limited	Below 5%	Below 5%	Below 5%
BlackRock, Inc.
BlackRock Holdco 2, Inc.
BlackRock Financial Management, Inc.
BlackRock International Holdings, Inc.
BR Jersey International Holdings LP.
BlackRock Australia Holdco Pty. Ltd.
BlackRock Investment Management (Australia) Limited	Below 5%	Below 5%	Below 5%
BlackRock, Inc.
BlackRock Holdco 2, Inc.
BlackRock Financial Management, Inc.
BlackRock Holdco 4, LLC
BlackRock Holdco 6, LLC
BlackRock Delaware Holdings Inc.
BlackRock Institutional Trust Company, National Association	Below 5%	Below 5%	Below 5%
BlackRock, Inc.
BlackRock Holdco 2, Inc.
BlackRock Financial Management, Inc.
BlackRock Holdco 4, LLC
BlackRock Holdco 6, LLC
BlackRock Delaware Holdings Inc.
BlackRock Fund Advisors	Below 5%	Below 5%	Below 5%
BlackRock, Inc.
BlackRock Holdco 2, Inc.
BlackRock Financial Management, Inc.	Below 5%	Below 5%	Below 5%
BlackRock, Inc.
BlackRock Holdco 2, Inc.
BlackRock Financial Management, Inc.

BlackRock International Holdings, Inc.
BR Jersey International Holdings LP.
BlackRock (Singapore) Holdco Pte. Ltd.
BlackRock HK Holdco Limited
BlackRock Asset Management North Asia Limited	Below 5%	Below 5%	Below 5%
BlackRock, Inc.
BlackRock Holdco 2, Inc.
BlackRock Financial Management, Inc.
BlackRock Capital Holdings, Inc.
BlackRock Advisors, LLC	Below 5%	Below 5%	Below 5%
BlackRock, Inc.
BlackRock Holdco 2, Inc.
BlackRock Financial Management, Inc.
BlackRock International Holdings, Inc.
BR Jersey International Holdings LP.
BlackRock Holdco 3, LLC
BlackRock Cayman 1 LP
BlackRock Cayman West Bay Finco Limited
BlackRock Cayman West Bay IV Limited
BlackRock Group Limited
BlackRock Finance Europe Limited
BlackRock Advisors (UK) Limited	Below 5%	Below 5%	Below 5%

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.

	National Bank of Greece S.A.
	/s/ Ioannis Kyriakopoulos
	(Registrant)
Date: December 6, 2018
Date: January 7, 2019
	Chief Financial Officer
	/s/ George Angelides
	(Registrant)
Date: December 6, 2018
Date: January 7, 2019
	Director, Financial Division

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