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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D

(Amendment No. 4)*

Under the Securities Exchange Act of 1934

Navios Maritime Acquisition Corporation

(Name of Issuer)

Common Stock, par value $0.0001
(Title of Class of Securities)

Y62159101
(CUSIP Number)

Vasiliki Papaefthymiou
Navios Maritime Holdings Inc.
85 Akti Miaouli Street
Piraeus, Greece 185 38
+30-210-4595000
(Name, Address and Telephone Number of Persons Authorized to Receive Notices and Communications)

April 27, 2010
(Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.þ

* The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

NAME OF REPORTING PERSON
I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

Navios Maritime Holdings Inc.

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(a) o

(b) þ

SEC USE ONLY

SOURCE OF FUNDS*

CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDING IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)

CITIZENSHIP OR PLACE OF ORGANIZATION

Republic of the Marshall Islands

SOLE VOTING POWER

NUMBER OF

10,542,885⁽¹⁾

SHARED VOTING POWER

BENEFICIALLY

OWNED BY

EACH

SOLE DISPOSITIVE POWER

REPORTING

PERSON

10,542,885⁽¹⁾

WITH

SHARED DISPOSITIVE POWER

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH PERSON

10,542,885⁽¹⁾

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) (see Item 5)

33.3%⁽¹⁾

TYPE OF REPORTING PERSON*

(1) Does not include 6,035,000 shares of common stock issuable upon exercise of warrants underlying the sponsor units, which are not currently exercisable and will not become exercisable within 60 days. Also does not include 7,600,000 shares of common stock issuable upon exercise of the private placement warrants, which are not currently exercisable, but which may become exercisable within the next 60 days if the acquisition of vessels (the “Acquisition”) is approved and consummated. If the Acquisition is consummated, Navios Maritime Holdings Inc. will beneficially own 18,142,885 shares of common stock, which would represent 46.3% of the Issuer’s outstanding common stock as of April 30, 2010.

Page 2 of 6 pages

NAME OF REPORTING PERSON
I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

Amadeus Maritime S.A.

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(a) o

(b) þ

SEC USE ONLY

SOURCE OF FUNDS*

CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDING IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)

CITIZENSHIP OR PLACE OF ORGANIZATION

Panama

SOLE VOTING POWER

NUMBER OF

SHARED VOTING POWER

BENEFICIALLY

OWNED BY

1,502,628⁽¹⁾

EACH

SOLE DISPOSITIVE POWER

REPORTING

PERSON

WITH

SHARED DISPOSITIVE POWER

1,502,628⁽¹⁾

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH PERSON

1,502,628⁽¹⁾

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) (see Item 5)

4.8%

TYPE OF REPORTING PERSON*


(1)		Represents shares of Common Stock owned directly by Amadeus Maritime S.A. of which Angeliki Frangou has beneficial ownership.

Page 3 of 6 pages

NAME OF REPORTING PERSON
I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

Angeliki Frangou

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(a) o

(b) þ

SEC USE ONLY

SOURCE OF FUNDS*

CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDING IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)

CITIZENSHIP OR PLACE OF ORGANIZATION

Greek

SOLE VOTING POWER

NUMBER OF

1,702,628⁽¹⁾

SHARED VOTING POWER

BENEFICIALLY

OWNED BY

EACH

SOLE DISPOSITIVE POWER

REPORTING

PERSON

1,702,628⁽¹⁾

WITH

SHARED DISPOSITIVE POWER

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH PERSON

1,702,628⁽¹⁾

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) (see Item 5)

5.4%

TYPE OF REPORTING PERSON*


(1)		Includes 1,502,628 shares of Common Stock held directly by Amadeus Maritime S.A. of which Ms. Frangou is the beneficial owner.

Page 4 of 6 pages

Explanatory Note

Except as specifically amended and supplemented by this Amendment No. 4, and by Amendment No. 1 filed on April 26, 2010 (“Amendment No. 1”), Amendment No. 2 filed on April 29, 2010 (“Amendment No. 2”) and Amendment No. 3 filed on April 30, 2010 (“Amendment No. 3”), all other provisions of the Schedule 13D filed by the Reporting Persons on April 8, 2010 (the “Original Schedule 13D”) remain in full force and effect. Capitalized terms used herein and not otherwise defined shall have the same meanings ascribed to them in the Original Schedule 13D. This Amendment No. 4 is being filed to correct previously reported purchases that were reported as made by Navios Maritime Holdings Inc. (“Holdings”); such purchases were actually made by both Holdings and Amadeus Maritime S.A. (“Amadeus”). The aggregate amount of such purchases reported previously has not changed; only the specific amount used by each respective purchasing party for their purchases of common stock has changed.

Item 3. Source and Amount of Funds or Other Consideration

This Amendment No. 4 amends and restates Item 3 of the Original Schedule 13D as set forth below:

The source of funds for any purchases made by the Reporting Persons shall be the Reporting Persons’ working capital, or personal funds in the case of Ms. Frangou.

Holdings used an aggregate of $44,858,022.79 from its working capital to fund the Common Stock purchases subject to and described in Item 5 of this Amendment No. 4.

Amadeus used an aggregate of $14,996,227.44 from its working capital to fund the Common Stock purchases subject to and described in Item 5 of this Amendment No. 4.

Item 4. Purpose of Transaction

This Amendment No. 4 supplements Item 4 of the Original Schedule 13D by amending and restating the last paragraph of Item 4 of Amendment No. 2 as set forth below:

On April 27, 2010, Holdings purchased 245,160 shares of Common Stock in a privately negotiated transaction at a price of $9.98 per share, for an aggregate purchase price of $2,446,696.80.

On April 27, 2010, Amadeus purchased 1,502,628 shares of Common Stock in a privately negotiated transaction at a price of $9.98 per share, for an aggregate purchase price of $14,996,227.44.

Item 5. Interest in Securities of the Issuer

This Amendment No. 4 amends and restates Item 5(a)-(c) of the Original Schedule 13D as set forth below:

(a), (b) As of April 27, 2010, Holdings beneficially owns 10,542,885 shares of the Issuer’s Common Stock, which does not include 7,600,000 shares of Common Stock issuable upon exercise of private placement warrants, which are not currently exercisable, but which may become exercisable within the next 60 days if the Acquisition is approved and consummated, and does not include 6,035,000 shares of Common Stock issuable upon exercise of warrants underlying the sponsor units, which are not currently exercisable and will not become exercisable within 60 days. The warrants underlying the sponsor units are not exercisable unless and until the reported last sale price of the Common Stock equals or exceeds $13.75 per share for any 20 days within any 30-trading day period beginning 90 days after the initial business combination. Angeliki Frangou beneficially owns 1,702,628 shares of the Issuer’s Common Stock; of this amount Ms. Frangou has sole dispositive and voting power over 200,000 shares that she owns directly, and she has sole voting and dispositive power over 1,502,628 shares held indirectly through Amadeus, which shares voting and dispositive power with Ms. Frangou. Ms. Frangou is Chairman of the Board of Directors, Chief Executive Officer and a principal stockholder of Holdings. Holdings, Amadeus and Angeliki Frangou may be deemed members of a “group” for the purposes of Section 13(d)(3) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). Ms. Frangou disclaims beneficial ownership of any shares of Common Stock owned by Holdings and Holdings disclaims beneficial ownership of any shares of Common Stock owned by Ms. Frangou or Amadeus, other than those shares of Common Stock for which such Reporting Person may exercise direct voting or dispositive power. The filing of this Schedule 13D shall not be construed as an admission that any Reporting Person is, for any purpose, the beneficial owner of any securities that are owned by any other Reporting Persons, except with respect to the 1,502,628 shares of Common Stock owned by Amadeus of which Ms. Frangou is the beneficial owner.

(c) The following transactions, the aggregate number of which are reported herein, were effected during the past 60 days:


			Shares of Common Stock
Reporting Person	Date of Purchase		Purchased		Price Per Share
Navios Maritime Holdings Inc.		4/14/10		29,700	$	9.91
Navios Maritime Holdings Inc.		4/15/10		23,300	$	9.91
Navios Maritime Holdings Inc.		4/16/10		2,200	$	9.91
Navios Maritime Holdings Inc.		4/20/10		2,275,000	$	9.95
Navios Maritime Holdings Inc.		4/21/10		1,932,525	$	9.9497
Navios Maritime Holdings Inc.		4/27/10		245,160	$	9.98
Amadeus Maritime S.A.		4/27/10		1,502,628	$	9.98

Page 5 of 6

SIGNATURES

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.


Date: May 5, 2010		Navios Maritime Holdings Inc.

	By:	/s/ Angeliki Frangou

	Name:	Angeliki Frangou
	Title:	Chief Executive Officer

		Amadeus Maritime S.A.

	By:	/s/ Jose Silva

	Name:	Jose Silva
	Title:	President

		/s/ Angeliki Frangou (individually)

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