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 January, 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.~~

~~REPLY~~Athens, TO21 ~~HELLENIC CAPITAL MARKET COMMISSION~~January 2019

~~Athens,~~Notification 04of important changes concerning voting rights under article 14 of L. 3556/~~01/2019~~2007

~~In reply to a relevant question by the Hellenic Capital Market Commission, we hereby inform investors that~~ National Bank of Greece SAS.A. (~~NBG)~~“the ~~and INVEL Group today (4/1/2019~~Bank”) ~~made~~announces, aaccording ~~second amendment~~ to ~~the~~article ~~Shareholders’~~14 ~~Agreement between the two entities, as first signed on 30.12.2013 and amended on 18.8.2015. The matter~~ of ~~this amendment agreement was the extension of the duration of the said Shareholders’ Agreement by three months, i~~L.e. ~~from 31~~3556/~~12/2018~~2007, ~~to 31/3/2019. This extension of~~ the 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~~Following ~~said~~a ~~extension~~relevant ofnotification that the ~~duration~~Bank ofreceived ~~the~~from ~~Shareholders’~~Blackrock, Inc. ~~Agreement~~on ~~for~~17.01.2019, aBlackRock, Inc. ~~three-month~~holds ~~period~~indirectly ~~implies~~as ~~also~~of ~~continuation~~16.01.2019 voting rights that correspond to an equal amount of ~~NBG’s~~common, ~~control~~registered, ~~over~~voting, dematerialized shares, as well as other financial instruments that provide the ~~same~~right ~~period,~~to ofacquire ~~Pangaea~~shares which incorporate voting rights, ~~under~~above the ~~terms~~5% ~~stipulated~~threshold inof the ~~relevant~~total ~~provisions~~voting rights of the ~~Shareholders’~~Bank, ~~Agreement~~including common, asregistered, ~~published~~voting ~~each~~shares ~~year~~held inby the ~~financial~~Hellenic ~~statements~~Financial ofStability ~~NBG~~Fund ~~Pangaea REIC~~(“HFSF”).

The ~~rumors~~voting ~~recently~~rights circulated in the online press about the supposed signing of an amendment to the Shareholders’ Agreement one year ago, by which NBG retains control of Pangaea if it holds more than 20% of Pangaea’s stock and the call option price on the shares held by NBG is amended, are ~~totally~~analysed ~~inaccurate.~~as follows:

Type of Financial Instrument	Number of corresponding voting rights	% of the above total number of NBG S.A. voting rights
Shares	39,181,981	4.28	%
Financial Instruments	6,759,663	0.74	%
Total	45,941,644	5.02	%

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 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 lnvestment 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 L.P.
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 L.P.
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, 21 January 2019

Notification of important changes concerning voting rights under article 7a par. 6 case c of L. 3864/2010

National Bank of Greece S.A. (“the Bank”) announces according to article 7a par. 6 case c of L. 3864/2010, the following:

Following a relevant notification that the Bank received from BlackRock, Inc. on 17.01.2019, BlackRock, Inc. holds indirectly as of 16.01.2019 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, above the 5% threshold of the total voting rights of the Bank, excluding common, registered, voting shares held by the HFSF, which are subject to the restrictions of article 7a of L. 3864/2010.

The voting rights are analysed as follows:

Type of Financial Instrument	Number of corresponding voting rights	% of the above total number of NBG S.A. voting rights
Shares	39,181,981	4.35	%
Financial Instruments	6,759,663	0.75	%
Total	45,941,644	5.10	%

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 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 lnvestment 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 L.P.
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 L.P.
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: January 7, 2019
Date: January 21, 2019
	Chief Financial Officer
	/s/ George Angelides
	(Registrant)
Date: January 7, 2019
Date: January 21, 2019
	Director, Financial Division

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