NESR National Energy Services Reunited Corporation

Name of Reporting Person

SV3 Holdings Pte. Ltd.

Check the Appropriate Box if a Member of a Group ( See Instructions)

(a)  ☐        (b)  ☒

SEC Use Only

Source of Funds ( See Instructions)

OO

Check if Disclosure of Legal Proceedings is Required Pursuant to Item 2(d) or 2(e)  ☐

Citizenship or Place of Organization

Singapore

NUMBER OF SHARES  BENEFICIALLY  OWNED BY EACH REPORTING PERSON

WITH

Sole Voting Power

0

Shared Voting Power

6,825,000 ⁽¹⁾

Sole Dispositive Power

0

Shared Dispositive Power

6,825,000 ⁽¹⁾

Aggregate Amount Beneficially Owned by Each Reporting Person

6,825,000

Check if the Aggregate Amount in Row (11) Excludes Certain Shares ( See Instructions)  ☐

Percent of Class Represented by Amount in Row (11)

8.0% ⁽²⁾

Type of Reporting Person ( See Instructions)

OO

SV3 (as defined below) is owned by two private equity funds: SCF-VIII AIV, L.P. and Viburnum Funds Pty Ltd. SCF-VIII AIV, L.P. has a 66 2/3% ownership interest in SV3 and Viburnum Funds Pty Ltd. has a 33 1/3% ownership interest in SV3. Each of SCF-VIII AIV, L.P. and Viburnum Funds Pty Ltd. may be deemed to share voting and dispositive control over the Ordinary Shares held by SV3. Each of SCF-VIII AIV, L.P. and Viburnum Funds Pty Ltd. disclaim beneficial ownership of any Ordinary Shares held or beneficially owned by SV3, except to the extent of each of their pecuniary interests therein.

Based on 85,562,769 Ordinary Shares of the Issuer outstanding, as reported in the Issuer’s Form 6-K filed with the Securities and Exchange Commission on November 8, 2018.

Name of Reporting Person

SCF-VIII AIV, L.P.

Check the Appropriate Box if a Member of a Group ( See Instructions)

(a)  ☐        (b)  ☒

SEC Use Only

Source of Funds ( See Instructions)

OO

Check if Disclosure of Legal Proceedings is Required Pursuant to Item 2(d) or 2(e)  ☐

Citizenship or Place of Organization

Cayman Islands

NUMBER OF SHARES  BENEFICIALLY  OWNED BY EACH REPORTING PERSON

WITH

Sole Voting Power

0

Shared Voting Power

4,550,000 ⁽¹⁾

Sole Dispositive Power

0

Shared Dispositive Power

4,550,000 ⁽¹⁾

Aggregate Amount Beneficially Owned by Each Reporting Person

4,550,000

Check if the Aggregate Amount in Row (11) Excludes Certain Shares ( See Instructions)  ☐

Percent of Class Represented by Amount in Row (11)

5.3% ⁽²⁾

Type of Reporting Person ( See Instructions)

PN

Power is exercised through Reporting Person’s general partner, SCF-VIII Offshore G.P. (as defined below), and its sole general partner, LESA Cayman (as defined below).

Based on 85,562,769 Ordinary Shares of the Issuer outstanding, as reported in the Issuer’s Form 6-K filed with the Securities and Exchange Commission on November 8, 2018.

Name of Reporting Person

SCF-VIII Offshore G.P., Limited Partnership

Check the Appropriate Box if a Member of a Group ( See Instructions)

(a)  ☐        (b)  ☒

SEC Use Only

Source of Funds ( See Instructions)

OO

Check if Disclosure of Legal Proceedings is Required Pursuant to Item 2(d) or 2(e)  ☐

Citizenship or Place of Organization

Cayman Islands

NUMBER OF SHARES  BENEFICIALLY  OWNED BY EACH REPORTING PERSON

WITH

Sole Voting Power

0

Shared Voting Power

4,550,000 ⁽¹⁾

Sole Dispositive Power

0

Shared Dispositive Power

4,550,000 ⁽¹⁾

Aggregate Amount Beneficially Owned by Each Reporting Person

4,550,000

Check if the Aggregate Amount in Row (11) Excludes Certain Shares ( See Instructions)  ☐

Percent of Class Represented by Amount in Row (11)

5.3% ⁽²⁾

Type of Reporting Person ( See Instructions)

PN

Reporting Person holds power over shares held by SCF-VIII AIV, L.P. Reporting Person’s power is exercised by its sole general partner, LESA Cayman.

Based on 85,562,769 Ordinary Shares of the Issuer outstanding, as reported in the Issuer’s Form 6-K filed with the Securities and Exchange Commission on November 8, 2018.

Name of Reporting Person

LESA Cayman Holdco, Ltd.

Check the Appropriate Box if a Member of a Group ( See Instructions)

(a)  ☐        (b)  ☒

SEC Use Only

Source of Funds ( See Instructions)

OO

Check if Disclosure of Legal Proceedings is Required Pursuant to Item 2(d) or 2(e)  ☐

Citizenship or Place of Organization

Cayman Islands

NUMBER OF SHARES  BENEFICIALLY  OWNED BY EACH REPORTING PERSON

WITH

Sole Voting Power

0

Shared Voting Power

4,550,000 ⁽¹⁾

Sole Dispositive Power

0

Shared Dispositive Power

4,550,000 ⁽¹⁾

Aggregate Amount Beneficially Owned by Each Reporting Person

4,550,000

Check if the Aggregate Amount in Row (11) Excludes Certain Shares ( See Instructions)  ☐

Percent of Class Represented by Amount in Row (11)

5.3% ⁽²⁾

Type of Reporting Person ( See Instructions)

OO

Reporting Person holds power over shares held by SCF-VIII AIV, L.P. through its general partner, and holds power over shares held by SCF-VIII Offshore G.P.

Based on 85,562,769 Ordinary Shares of the Issuer outstanding, as reported in the Issuer’s Form 6-K filed with the Securities and Exchange Commission on November 8, 2018.

Name of Reporting Person

L.E. Simmons

Check the Appropriate Box if a Member of a Group ( See Instructions)

(a)  ☐        (b)  ☒

SEC Use Only

Source of Funds ( See Instructions)

OO

Check if Disclosure of Legal Proceedings is Required Pursuant to Item 2(d) or 2(e)  ☐

Citizenship or Place of Organization

United States of America

NUMBER OF SHARES  BENEFICIALLY  OWNED BY EACH REPORTING PERSON

WITH

Sole Voting Power

0

Shared Voting Power

4,550,000 ⁽¹⁾

Sole Dispositive Power

0

Shared Dispositive Power

4,550,000 ⁽¹⁾

Aggregate Amount Beneficially Owned by Each Reporting Person

4,550,000

Check if the Aggregate Amount in Row (11) Excludes Certain Shares ( See Instructions)  ☐

Percent of Class Represented by Amount in Row (11)

5.3% ⁽²⁾

Type of Reporting Person ( See Instructions)

IN

L.E. Simmons is the sole shareholder of LESA Cayman, and in that capacity may be deemed to beneficially own all of the Ordinary Shares, no par value, of National Energy Services Reunited Corp. deemed to be beneficially owned by LESA Cayman. LESA Cayman indirectly holds power over shares held by SCF-VIII AIV, L.P. through its general partner, and holds power over shares held by SCF-VIII Offshore G.P.

Based on 85,562,769 Ordinary Shares of the Issuer outstanding, as reported in the Issuer’s Form 6-K filed with the Securities and Exchange Commission on November 8, 2018.

Security and Issuer.

Identity and Background

This Schedule 13D is filed jointly by each of the below persons (each individually, a “ Reporting Person ” and collectively, the “ Reporting Persons ”). The Reporting Persons have entered into a joint filing agreement, dated February 14, 2019, a copy of which is attached hereto as Exhibit 99.1.

SV3 Holdings Pte. Ltd., a Singapore private limited company (“ SV3 ”);

SCF-VIII AIV, L.P., a Cayman Islands exempted limited partnership;

SCF-VIII Offshore G.P., Limited Partnership, a Cayman Islands exempted limited partnership (“ SCF-VIII Offshore G.P. ”);

LESA Cayman Holdco, Ltd., a Cayman Islands exempted company (“ LESA Cayman ”); and

L.E. Simmons, a natural person residing in the State of Texas and a citizen of the United States of America.

The address of the principal business and principal office of each of the Reporting Persons (other than SV3) is 600 Travis Street, Suite 6600, Houston, Texas 77002. The address of the principal business and principal office of SV3 is 80 Robinson Road, #02-00, Singapore 068898.

The principal business of each of the Reporting Persons is as follows:

The principal business of SV3 is the ownership of equity interests of various entities.

The principal business of SCF-VIII AIV, L.P. is the ownership of equity interests of various entities.

The principal business of SCF-VIII Offshore G.P. is the ownership of general partner interests of SCF-VIII AIV, L.P.

The principal business of LESA Cayman is the ownership of equity interests of various entities.

The principal occupation of L.E. Simmons is serving as the Chairman of L.E. Simmons & Associates, Incorporated, a Delaware corporation (“ LESA ”).

None of the Reporting Persons nor their respective executive officers, managers or directors (the “ Listed Persons ”) listed on Schedule I hereto, has, during the last five years, been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors) or been party to a civil proceeding of a judicial or administrative body of competent jurisdiction and as a result of such proceeding was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws.

See Item 2(a) for the citizenship of L.E. Simmons.

Source and Amount of Funds or Other Consideration.

Purpose of Transaction.

None.

None.

None.

None.

None.

None.

None.

None.

None.

The Reporting Persons do not have, as of the date of this Schedule 13D, any plans or proposals that relate to or would result in any of the actions or events specified in clauses (a) through (i) of Item 4 of Schedule 13D. The Reporting Persons may change their plans or proposals in the future. In determining from time to time whether to sell the Ordinary Shares reported as beneficially owned in this Schedule 13D (and in what amounts) or to retain such securities, the Reporting Persons will take into consideration such factors as they deem relevant, including the business and prospects of the Issuer, anticipated future developments concerning the Issuer, existing and anticipated market conditions from time to time, general economic conditions, regulatory matters, and other opportunities available to the Reporting Persons. The Reporting Persons reserve the right to acquire additional securities of the Issuer in the open market, in privately negotiated transactions (which may be with the Issuer or with third parties) or otherwise, to dispose of all or a portion of their holdings of securities of the Issuer or to change their intention with respect to any or all of the matters referred to in this Item 4.

Interest in Securities of the Issuer.

The aggregate number and percentage of Ordinary Shares beneficially owned by each of the Reporting Persons is as follows:

SV3 is the direct beneficial owner of 6,825,000 Ordinary Shares, which constitutes 8.0% of the outstanding Ordinary Shares.

SCF-VIII AIV, L.P. is the indirect beneficial owner of 4,550,000 Ordinary Shares, which constitutes 5.3% of the outstanding Ordinary Shares.

As a result of its role as the sole general partner of SCF-VIII AIV, L.P., SCF-VIII Offshore G.P. is the indirect beneficial owner of 4,550,000 Ordinary Shares, which constitutes 5.3% of the outstanding Ordinary Shares.

As a result of its role as the sole general partner of SCF-VIII Offshore G.P., LESA Cayman may be deemed the indirect beneficial owner of the 4,550,000 Ordinary Shares directly owned by SV3, which constitutes 5.3% of the outstanding Ordinary Shares.

As a result of his role as the sole shareholder of LESA Cayman, Mr. Simmons may be deemed the indirect beneficial owner of the 4,550,000 Ordinary Shares directly owned by SV3, which constitutes 5.3% of the outstanding Ordinary Shares.

The power to vote and dispose of the Ordinary Shares beneficially owned by each of the Reporting Persons is as follows:

SV3 has shared voting power and shared dispositive power with respect to 6,825,000 Ordinary Shares and has sole voting power and sole dispositive power with respect to zero Ordinary Shares.

SCF-VIII AIV, L.P. has shared voting power and shared dispositive power with respect to 4,550,000 Ordinary Shares and has sole voting power and sole dispositive power with respect to zero Ordinary Shares.

SCF-VIII Offshore G.P. has shared voting power and shared dispositive power with respect to 4,550,000 Ordinary Shares and has sole voting power and sole dispositive power with respect to zero Ordinary Shares.

LESA Cayman has shared voting power and shared dispositive power with respect to 4,550,000 Ordinary Shares and has sole voting power and sole dispositive power with respect to zero Ordinary Shares.

Mr. Simmons has shared voting power and shared dispositive power with respect to 4,550,000 Ordinary Shares and has sole voting power and sole dispositive power with respect to zero Ordinary Shares.

There have been no reportable transactions with respect to the Ordinary Shares within the last 60 days by the Reporting Persons.

Except as otherwise described herein, no other person is known by the Reporting Persons to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, Ordinary Shares beneficially owned by the Reporting Persons.

Not applicable.

Contracts, Arrangements, Understandings or Relationships with Respect to Securities of the Issuer.

Materials to be Filed as Exhibits

600 Travis Street, Suite 6600, Houston, Texas 77002.

80 Robinson Road, #02-00, Singapore 068898.