SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D/A

(Amendment No. 4)

Under the Securities Exchange Act of 1934

EnLink Midstream Partners, LP

(Name of Issuer)

Common Units

(Title of Class of Securities)

29336U 10 7

(CUSIP Number)

Lyndon C. Taylor

Executive Vice President and General Counsel

Devon Energy Corporation

333 W. Sheridan Ave.

Oklahoma City, OK 73102-5015

Tel: (405) 235-3611

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

June 5, 2018

(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:  ☐

Note: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See §240.13d-7 for other parties to whom copies are to be sent.

The information required on 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).

(Continued on following pages)

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SCHEDULE 13D/A

This Amendment No. 4 (this “Amendment”) amends the Schedule 13D, dated March 7, 2014, as amended by Amendment No. 1, dated February 17, 2015, Amendment No. 2, dated April 29, 2015, and Amendment No. 3, dated May 27, 2015, filed by Devon Energy Corporation, a Delaware corporation (“Devon”), Devon Energy Corporation (Oklahoma), an Oklahoma corporation (“Devon OK”), Devon Gas Co., L.L.C., a Delaware limited liability company (formerly known as Devon Gas Corporation) (“Devon Gas”), Southwestern Gas, Devon Gas Operating, Inc., a Delaware corporation (“Devon Gas Operating”), Devon Gas Services, EnLink Midstream Manager, EnLink Midstream, EMI and Acacia.

Item 1. Security and Issuer

Item 1 is hereby amended by amending and restating the second sentence thereof as follows:

The address of the principal executive offices of the Issuer is 1722 Routh Street, Suite 1300, Dallas, Texas 75201.

Item 2. Identity and Background

Item 2 is hereby amended and restated as follows:

(a) This Schedule 13D/A is being filed by:

(i) Devon;

(ii) Devon OK;

(iii) Devon Gas;

(iv) Southwestern Gas;

(v) Devon Gas Operating;

(vi) Devon Gas Services;

(vii) EnLink Midstream Manager;

(viii) EnLink Midstream;

(ix) EMI; and

(x) Acacia (together with Devon, Devon OK, Devon Gas, Southwestern Gas, Devon Gas Operating, Devon Gas Services, EnLink Midstream Manager, EnLink Midstream and EMI, the “Reporting Persons”).

Devon is a public company and owns 100% of the outstanding common stock of Devon OK. Devon OK owns 100% of the outstanding limited liability company interests of Devon Gas. Devon Gas owns (i) 100% of the limited partner interests of Devon Gas Services, (ii) 100% of the outstanding common stock of Devon Gas Operating, the general partner of Devon Gas Services, and (iii) 100% of the outstanding limited liability company interests of Southwestern Gas. Devon Gas Services owns 63.8% of the outstanding limited liability company interests of EnLink Midstream and 100% of the limited liability company interests of EnLink Midstream Manager, the managing member of EnLink Midstream. EnLink Midstream owns 100% of the outstanding common stock of each of Acacia and EMI. Acacia owns 19.5% of the limited partner interests of EnLink MLP. EMI owns 5.8% of the limited partner interests of EnLink MLP and all of the limited liability company interests of the General Partner. The General Partner owns (i) the incentive distribution rights and (ii) the approximately 0.4% general partner interest in EnLink MLP.

(b) The address of the principal executive offices of each of Devon, Devon OK, Devon Gas, Southwestern Gas, Devon Gas Operating and Devon Gas Services is 333 West Sheridan Avenue, Oklahoma City, Oklahoma, 73102. The address of the principal executive offices of each of EnLink Midstream Manager, EnLink Midstream, EMI and Acacia is 1722 Routh Street, Suite 1300, Dallas, Texas 75201.

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(c) The principal business of:

(i) Devon is to hold equity interests in entities that are involved in the business of the exploration and production of oil and natural gas;

(ii) Devon OK is to hold equity interests in Devon Gas and other entities;

(iii) Devon Gas is to hold equity interests in Southwestern Gas, Devon Gas Services and Devon Gas Operating;

(iv) Southwestern Gas is to hold equity interests in EnLink MLP;

(v) Devon Gas Operating is to hold a general partner interest in Devon Gas Services;

(vi) Devon Gas Services is to engage in marketing activities related to crude oil, natural gas liquids and natural gas production and to hold equity interests in EnLink MLP, EnLink Midstream and EnLink Midstream Manager;

(vii) EnLink Midstream Manager is to hold a managing member interest in EnLink Midstream;

(viii) EnLink Midstream is to hold equity interests in EMI and Acacia;

(ix) EMI is to hold equity interests in EnLink MLP, the General Partner and other entities; and

(x) Acacia is to hold equity interests in EnLink MLP.

In accordance with the provisions of General Instruction C to Schedule 13D, certain information concerning the executive officers, directors and partners of the Reporting Persons, as applicable, and persons controlling the Reporting Persons, as applicable (collectively, the “Covered Persons”), required by Item 2 of Schedule 13D is provided on Appendix A.

(d) During the last five years, no Reporting Persons nor any person named on Appendix A attached hereto has been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors).

(e) During the last five years, no Reporting Persons nor any person named on Appendix A attached hereto has been a party to a civil proceeding of a judicial or administrative body of competent jurisdiction as a result of which such Reporting Person or person named on Appendix A 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 a finding of any violation with respect to such laws.

(f) Devon, Devon Gas Operating, EMI and Acacia are each a Delaware corporation. Devon OK is an Oklahoma corporation. Southwestern Gas is a Texas limited liability company. Devon Gas Services is a Texas limited partnership. Devon Gas, EnLink Midstream Manager and EnLink Midstream are each a Delaware limited liability company. All of the persons named on Appendix A attached hereto, other than Mr. Michael M. Kanovsky, are United States citizens. Mr. Kanovsky is a citizen of Canada.

Item 4. Purpose of Transaction

Item 4 is hereby amended and supplemented as follows:

On June 5, 2018, Devon Gas Services, Southwestern Gas, EnLink Midstream Manager, acting solely in its individual capacity and not in its capacity as managing member of EnLink Midstream, and, solely for certain purposes described therein, Devon, entered into a Purchase Agreement (the “Purchase Agreement”) with GIP III Stetson I, L.P., a Delaware limited partnership (“MLP Acquiror”), and GIP III Stetson II, L.P., a Delaware limited partnership (“ENLC Acquiror” and, together with MLP Acquiror, “Acquirors”), which Acquirors are affiliates of Global Infrastructure Partners. Pursuant to the terms of the Purchase Agreement, (a) Devon Gas Services will transfer to ENLC Acquiror 115,495,669 common units representing limited liability company interests in EnLink Midstream, (b) Devon Gas Services will transfer to MLP Acquiror (i) 87,128,717 Common Units and (ii) all of the outstanding limited liability company interests in EnLink Midstream Manager and (c) Southwestern Gas will transfer to MLP Acquiror 7,531,883 Common Units, for aggregate consideration of $3,125,000,000, in each case subject to the terms and conditions set forth in the Purchase Agreement. MLP Acquiror shall be entitled to all distributions on the Common Units sold pursuant to the terms of the Purchase Agreement that are distributed in the fiscal quarter in which the closing of the transactions contemplated by the Purchase Agreement occurs, subject to certain exceptions. Additionally, the Purchase Agreement obligates Devon Gas Services and Southwestern Gas to

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use commercially reasonable efforts to deliver duly executed letters of resignation, or to otherwise cause the removal, of any individual that is an officer or director of EnLink Midstream Manager or the General Partner that is also a manager, director or officer of Devon Gas Services, Southwestern Gas or any of their affiliates, in each case, effective as of the closing of the transactions contemplated by the Purchase Agreement.

Except as set forth in this Amendment, the Reporting Persons have no present plans which relate to or would result in any of the actions specified in clauses (a) through (j) of Item 4 of Schedule 13D. 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, or to change their intention with respect to any or all of the matters referred to in this Item 4. The Reporting Persons undertake no obligation to make additional disclosures in connection with the matters described herein except to the extent required by law.

The foregoing description of the Purchase Agreement is qualified in its entirety by reference to the full text of such document, a copy of which is attached to this Amendment as Exhibit 8, and is incorporated by reference herein.

Item 5. Interest in Securities of the Issuer

Item 5 is hereby amended and restated as follows:

(a) – (b) The aggregate number and percentage of Common Units beneficially owned by the Reporting Persons (on the basis of a total of approximately 350,245,506 Common Units outstanding as of June 1, 2018) are as follows:

Devon

(a) Amount beneficially owned: 183,189,051 Common Units; Percentage: 52.3%

(b) Number of shares to which the Reporting Person has:

i. Sole power to vote or to direct the vote: 0

ii. Shared power to vote or to direct the vote: 183,189,051 Common Units

iii. Sole power to dispose or to direct the disposition of: 0

iv. Shared power to dispose or to direct the disposition of: 183,189,051 Common Units

Devon OK

(a) Amount beneficially owned: 183,189,051 Common Units; Percentage: 52.3%

(b) Number of shares to which the Reporting Person has:

i. Sole power to vote or to direct the vote: 0

ii. Shared power to vote or to direct the vote: 183,189,051 Common Units

iii. Sole power to dispose or to direct the disposition of: 0

iv. Shared power to dispose or to direct the disposition of: 183,189,051 Common Units

Devon Gas

(a) Amount beneficially owned: 183,189,051 Common Units; Percentage: 52.3%

(b) Number of shares to which the Reporting Person has:

i. Sole power to vote or to direct the vote: 0

ii. Shared power to vote or to direct the vote: 183,189,051 Common Units

iii. Sole power to dispose or to direct the disposition of: 0

iv. Shared power to dispose or to direct the disposition of: 183,189,051 Common Units

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Southwestern Gas

(a) Amount beneficially owned: 7,531,883 Common Units; Percentage: 2.2%

(b) Number of shares to which the Reporting Person has:

i. Sole power to vote or to direct the vote: 0

ii. Shared power to vote or to direct the vote: 7,531,883 Common Units

iii. Sole power to dispose or to direct the disposition of: 0

iv. Shared power to dispose or to direct the disposition of: 7,531,883 Common Units

Devon Gas Operating

(a) Amount beneficially owned: 175,657,168 Common Units; Percentage: 50.2%

(b) Number of shares to which the Reporting Person has:

i. Sole power to vote or to direct the vote: 0

ii. Shared power to vote or to direct the vote: 175,657,168 Common Units

iii. Sole power to dispose or to direct the disposition of: 0

iv. Shared power to dispose or to direct the disposition of: 175,657,168 Common Units

Devon Gas Services

(a) Amount beneficially owned: 175,657,168 Common Units; Percentage: 50.2%

(b) Number of shares to which the Reporting Person has:

i. Sole power to vote or to direct the vote: 0

ii. Shared power to vote or to direct the vote: 175,657,168 Common Units

iii. Sole power to dispose or to direct the disposition of: 0

iv. Shared power to dispose or to direct the disposition of: 175,657,168 Common Units

EnLink Midstream Manager

(a) Amount beneficially owned: 88,528,451 Common Units; Percentage: 25.3%

(b) Number of shares to which the Reporting Person has:

i. Sole power to vote or to direct the vote: 0

ii. Shared power to vote or to direct the vote: 88,528,451 Common Units

iii. Sole power to dispose or to direct the disposition of: 0

iv. Shared power to dispose or to direct the disposition of: 88,528,451 Common Units

EnLink Midstream

(a) Amount beneficially owned: 88,528,451 Common Units; Percentage: 25.3%

(b) Number of shares to which the Reporting Person has:

i. Sole power to vote or to direct the vote: 0

ii. Shared power to vote or to direct the vote: 88,528,451 Common Units

iii. Sole power to dispose or to direct the disposition of: 0

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iv. Shared power to dispose or to direct the disposition of: 88,528,451 Common Units

EMI

(a) Amount beneficially owned: 20,280,252 Common Units; Percentage: 5.8%

(b) Number of shares to which the Reporting Person has:

i. Sole power to vote or to direct the vote: 0

ii. Shared power to vote or to direct the vote: 20,280,252 Common Units

iii. Sole power to dispose or to direct the disposition of: 0

iv. Shared power to dispose or to direct the disposition of: 20,280,252 Common Units

Acacia

(a) Amount beneficially owned: 68,248,199 Common Units; Percentage: 19.5%

(b) Number of shares to which the Reporting Person has:

i. Sole power to vote or to direct the vote: 0

ii. Shared power to vote or to direct the vote: 68,248,199 Common Units

iii. Sole power to dispose or to direct the disposition of: 0

iv. Shared power to dispose or to direct the disposition of: 68,248,199 Common Units

To the knowledge of the Reporting Persons, no executive officer or manager of the Reporting Persons or other party listed on Appendix A has sole or shared beneficial ownership of any Common Units beneficially owned by the Reporting Persons.

(c) Except as set forth in this Amendment (including Item 4), there have been no reportable transactions with respect to the Common Units by the Reporting Persons in the last sixty days.

(d) Except as set forth in this Amendment (including Item 4), to the knowledge of the Reporting Persons, no person, other than the Reporting Persons, has the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the Common Units described in this Item 5.

(e) Not applicable.

Item 6. Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer

Item 6 is hereby amended and restated as follows:

The information set forth in Item 4 of this Amendment is incorporated by reference in its entirety into this Item 6.

Under the Third Amended and Restated Limited Liability Company Agreement of the General Partner, as amended (the “Amended GP LLC Agreement”), EMI has the right to elect the members of the Board of the General Partner; provided that one member of the Board of the General Partner shall be elected or approved pursuant to that certain Board Representation Agreement dated as of January 7, 2016 (the “Board Representation Agreement”), to which the General Partner and EMI are parties.

The Ninth Amended and Restated Agreement of Limited Partnership of EnLink MLP, as amended (the “Amended MLP LPA”), additionally contains various provisions with respect to the Common Units governing, among other matters, voting, distributions, transfers, the General Partner’s limited call right and allocations of profits and losses to the partners.

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On March 7, 2014, Devon, Devon Gas Services, Southwestern Gas, EnLink MLP and the General Partner, entered into a Unitholder Agreement (the “Unitholder Agreement”). Under the Unitholder Agreement, in certain circumstances, EnLink MLP will be obligated, upon request, to file a registration statement covering the potential sale of Common Units held by Devon Gas Services and Southwestern Gas. In addition, the Unitholder Agreement gives Devon Gas Services and Southwestern Gas piggyback registration rights under certain circumstances. Pursuant to the Purchase Agreement, these registration rights will be transferred to MLP Acquiror in connection with the closing of the transactions contemplated by the Purchase Agreement. The Unitholder Agreement also includes provisions dealing with holdback agreements, indemnification and contribution, and allocation of expenses, as well as EnLink MLP’s obligations to provide certain financial and other information to Devon Gas Services and Southwestern Gas.

References to, and descriptions of, the Amended GP LLC Agreement, the Board Representation Agreement, the Amended MLP LPA and the Unitholder Agreement as set forth herein are qualified in their entirety by reference to the copies of the Amended GP LLC Agreement included as Exhibit 1 and Exhibit 12 to the Schedule 13D, as amended, including pursuant to this Schedule 13D/A, filed by the Reporting Persons, the Board Representation Agreement included as Exhibit 13 to this Schedule 13D/A, the Amended MLP LPA included as Exhibits 10 and 11 to this Schedule 13D/A, and the Unitholder Agreement included as Exhibit 14 to this Schedule 13D/A, and such agreements, including, as applicable, amendments thereto, are incorporated by reference herein in their entirety where such references and descriptions appear.

Item 7. Material to Be Filed as Exhibits

Item 7 is hereby amended and supplemented to include the following exhibits:

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Signature

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.

SIGNATURE PAGE TO

SCHEDULE 13D/A

SIGNATURE PAGE TO

SCHEDULE 13D/A

APPENDIX A

DIRECTORS AND EXECUTIVE OFFICERS OF THE REPORTING PERSONS

The following tables set forth the names, positions and present principal occupations or employment and business addresses of the members, directors and executive officers of the Reporting Persons. All the individuals listed below, other than Michael M. Kanovsky are citizens of the United States. Mr. Kanovsky is a citizen of Canada.

Directors and Executive Officers of Devon Energy Corporation

Appendix A – 1

Directors and Executive Officers of Devon Energy Corporation (Oklahoma)

Appendix A – 2

Directors and Executive Officers of Devon Gas Co., L.L.C.

Devon Gas Co., L.L.C. has the officers listed below and is managed by Devon Energy Corporation (Oklahoma), its sole member, whose directors and executive officers are listed above.

Directors and Executive Officers of Southwestern Gas Pipeline, L.L.C.

Southwestern Gas Pipeline, L.L.C. has the officers listed below and is managed by Devon Gas Co., L.L.C., its sole member, whose directors and executive officers are listed above.

Appendix A – 3

Directors and Executive Officers of Devon Gas Operating, Inc.

General Partner and Limited Partner of Devon Gas Services, L.P.

Devon Gas Services, L.P. has the officers listed below and is managed by Devon Gas Operating, Inc., its general partner, whose directors and executive officers are listed above.

Appendix A – 4

Directors and Executive Officers of EnLink Midstream Manager, LLC

Appendix A – 5

Directors and Executive Officers of EnLink Midstream, LLC

EnLink Midstream, LLC has no officers or directors and is managed by EnLink Midstream Manager, LLC, its managing member, whose directors and executive officers are listed above.

Directors and Executive Officers of EnLink Midstream, Inc.

Appendix A – 6

Directors and Executive Officers of Acacia Natural Gas Corp I, Inc.

Appendix A – 7