CUSIP NO. Y62134104 13G
1 Name of Reporting Person
Advisory Research Inc.
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2 Check the Appropriate Box if a Member of a Group (a) [ ]
(b) [ ]
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3 SEC Use Only
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4 Citizenship or Place of Organization
Delaware
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Number of
5 Sole Voting Power
Shares 1,639,000
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Beneficially
6 Shared Voting Power
Owned By 0
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Each
7 Sole Dispositive Power
Reporting 1,639,000
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Person
8 Shared Dispositive Power
With 0
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9 Aggregate Amount Beneficially Owned by Each Reporting Person
1,639,000
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10 Check if the Aggregate Amount in Row (9) Excludes Certain
Shares [ ]
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11 Percent of Class Represented by Amount in Row (9)
8.5%
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12 Type of Reporting Person
IA
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CUSIP NO. Y62134104 13G
1 Name of Reporting Person
Piper Jaffray Companies
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2 Check the Appropriate Box if a Member of a Group (a) [ ]
(b) [ ]
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3 SEC Use Only
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4 Citizenship or Place of Organization
Delaware
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Number of
5 Sole Voting Power
Shares 0
-----------------------------------------------
Beneficially
6 Shared Voting Power
Owned By 1,639,000
-----------------------------------------------
Each
7 Sole Dispositive Power
Reporting 0
-----------------------------------------------
Person
8 Shared Dispositive Power
With 1,639,000
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9 Aggregate Amount Beneficially Owned by Each Reporting Person
1,639,000
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10 Check if the Aggregate Amount in Row (9) Excludes Certain
Shares [ ]
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11 Percent of Class Represented by Amount in Row (9)
8.5%
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12 Type of Reporting Person
HC
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CUSIP NO. Y62134104 13G
1 Name of Reporting Person
Nuveen Energy MLP Total Return Fund
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2 Check the Appropriate Box if a Member of a Group (a) [ ]
(b) [ ]
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3 SEC Use Only
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4 Citizenship or Place of Organization
Massachusetts Business Trust
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Number of
5 Sole Voting Power
Shares 0
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Beneficially
6 Shared Voting Power
Owned By 679,895
-----------------------------------------------
Each
7 Sole Dispositive Power
Reporting 0
-----------------------------------------------
Person
8 Shared Dispositive Power
With 679,895
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9 Aggregate Amount Beneficially Owned by Each Reporting Person
679,895
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10 Check if the Aggregate Amount in Row (9) Excludes Certain
Shares [ ]
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11 Percent of Class Represented by Amount in Row (9)
3.5%
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12 Type of Reporting Person
IC
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Item 1 (a) Name of Issuer: Navios Maritime Midstream Partners L.P.
(b) Name of Issuer's Principal Executive Offices:
7 Avenue De Grande Bretagne Office 11B2
Monte Carlo, MC 98000 Monaco
Item 2 (a) Person Filing:
(i) Advisory Research, Inc.
(ii) Piper Jaffray Companies
(iii) Nuveen Energy MLP Total Return Fund
(b) Address:
(i) Advisory Research, Inc.
180 N. Stetson Ave., Suite 5500
Chicago, IL 60601
(ii) Piper Jaffray Companies
800 Nicollet Mall Suite 800
Minneapolis, MN 55402
(iii)Nuveen Energy MLP Total Return Fund
333 West Wacker Drive
Chicago IL 60606
(c) Citizenship:
(i) Advisory Research, Inc. is a Delaware Corporation.
(ii) Piper Jaffray Companies is a Delaware Corporation.
(iii)Nuveen Energy MLP Total Return Fund is a Massachusetts
Business Trust.
(d) Title of Class of Securities:
Common Units Representing Limited Partner Interests
(e) CUSIP Number: Y62134104
Item 3 If this statement is filed pursuant to sections
240.13d-1(b) or 240.13d-2(b) or (c), check whether the
person filing is a:
(i) Advisory Research, Inc. is an investment advisor in
accordance with section 240.13d-1(b)(1)(ii)(E)
(ii) Piper Jaffray Companies is a parent holding company
or control person in accordance with section
240.13d-1(b)(1)(ii)(G)
(iii) Nuveen Energy MLP Total Return Fund is an investment company
registered under section 8 of the Investment Company Act of
1940
Item 4 Ownership
(a) Amount Beneficially Owned:
(i) Advisory Research, Inc.: 1,639,000
(ii) Piper Jaffray Companies: 1,639,000
(iii)Nuveen Energy MLP Total Return Fund:679,895
(iv)
(b) Percent of Class
(i) Advisory Research, Inc.: 8.5%
(ii) Piper Jaffray Companies: 8.5%
(iii) Nuveen Energy MLP Total Return Fund: 3.5%
(c) Number of shares as to which reporting person has:
(1) Sole power to vote or direct vote:
(i) Advisory Research, Inc.: 1,639,000
(ii) Piper Jaffray Companies: 0
(iii) Nuveen Energy MLP Total Return Fund: 0
(2) Shared power to vote or direct the vote:
(i) Advisory Research, Inc.: 0
(ii) Piper Jaffray Companies: 1,639,000
(iii)Nuveen Energy MLP Total Return Fund: 679,895
(3) Sole power to dispose or to direct disposition of:
(i) Advisory Research, Inc.: 1,639,000
(ii) Piper Jaffray Companies: 0
(iii) Nuveen Energy MLP Total Return Fund: 0
(4) Shared power to dispose or to direct the disposition of:
(i) Advisory Research, Inc.: 0
(ii) Piper Jaffray Companies: 1,639,000
(iii) Nuveen Energy MLP Total Return Fund: 679,895
Item 5 Ownership of Five Percent or Less of a Class:
Nuveen Energy MLP Total Return Fund no longer owns over 5%.
Item 6 Ownership of More than Five Percent on Behalf of Another
Person:
Not Applicable
Item 7 Identification and Classification of the Subsidiary
Which Acquired the Security being Reported on by the
Parent Holding Company:
Not Applicable
Item 8 Identification and Classification if Members of
the Group:
Not Applicable
Item 9 Notice of Dissolution of Group:
Not Applicable
Item 10 Certification
By signing below I certify that, to the best of my knowledge and belief,
the securities referred to above were acquired and are held in the ordinary
course of business and were not acquired and are not held for the purpose of
or with the effect of changing or influencing the control of the issuer of
the securities and were not acquired and are not held in connection with or
as a participant in any transaction having that purpose or effect.
In accordance with Rule 13d-4 of the Securities Exchange Act of 1934, each
of the persons filing this statement expressly disclaim the beneficial
ownership of the securities covered by this statement and the filing of
this report shall not be construed as an admission by such persons that
they are the beneficial owners of such securities.
SIGNATURES
The undersigned certify, after reasonable inquiry and to the best knowledge
and belief of the undersigned, that the information set forth in this
Statement is true, complete and correct. The undersigned agree to the
filing of this single Statement on Schedule 13G.
Advisory Research, Inc.
Date: February 14, 2018 By: /s/ Susan Steiner
Name: Susan Steiner
Title: Chief Compliance Officer
Piper Jaffray Companies
Date: February 14, 2018 By: /s/ Tim Carter
Name: Tim Carter
Title: Chief Financial Officer
Nuveen Energy MLP Total Return Fund
Date: February 14, 2018 By: /s/ Kevin J. McCarthy
Name: Kevin J. McCarthy
Title: Vice President
JOINT FILING AGREEMENT
WHEREAS, in accordance with Rule 13d-1(k)(1) under the Securities
and Exchange Act of 1934 (the Act), only one joint Statement and
any amendments thereto need to be filed whenever one or more persons
are required to file such a Statement or any amendments thereto
pursuant to Section 13(d) of the Act with respect to the same
securities,provided that said persons agree in writing that such
Statement or amendments thereto is filed on behalf of each of them;
NOW, THEREFORE, the parties hereto agree as follows:
Advisory Research, Inc., Piper Jaffray Companies,and the Nuveen Energy MLP
Total Return Fund, do hereby agree, in accordance with Rule 13d-1(k)(1)
under the Act, to file a Statement on Schedule 13G relating to their
ownership of the Common Units representing Limited Partnership Interests
in the Issuer, and do hereby further agree that said Statement on Schedule
13G shall be filed on behalf of each of them.
Advisory Research, Inc.
Date: February 14, 2018 By: /s/ Susan Steiner
Name: Susan Steiner
Title: Chief Compliance Officer
Piper Jaffray Companies
Date: February 14, 2018 By: /s/ Tim Carter
Name: Tim Carter
Title: Chief Financial Officer
Nuveen Energy MLP Total Return Fund
Date: February 14, 2018 By: /s/ Kevin J. McCarthy
Name: Kevin J. McCarthy
Title: Vice President
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