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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549

SCHEDULE 13D

UNDER THE SECURITIES EXCHANGE ACT OF 1934
(Amendment No. 2)*

Magnolia Oil & Gas Corporation

(Name of Issuer)

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

559663109
(CUSIP Number)

J. Andrew West
1001 Fannin Street, Suite 800
Houston, Texas 77002
(713) 659-3500
(Name, Address and Telephone Number of Person
Authorized to Receive Notices and Communications)

September 4, 2018
(Date of Event Which Requires Filing of Statement on Schedule 13D)

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), checking the following box. ¨

* 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 disclosures provided in a prior cover page.

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).

CUSIP No. 559663109 Schedule 13D  Page 2 of 19 Pages

(1)	Name of Filing Parties:
	I.R.S. Identification No. of Above Persons (entities only):
	EnerVest, Ltd./76-0378595
(2)	Check the Appropriate Box if a Member of a Group (See Instructions):
	(a) ¨
	(b) x
(3)	SEC Use Only:
(4)	Source of Funds (See Instructions):  OO
(5)	Check Box if Disclosure of Legal Proceedings is Required Pursuant to Items 2(d) or 2(e):  ¨
(6)	Citizenship or Place of Organization:
	Texas, U.S.

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:	(7)	Sole Voting Power          0
	(8)	Shared Voting Power          124,730,358 (1)
	(9)	Sole Dispositive Power          0
	(10)	Shared Dispositive Power          124,730,358 (1)

(11)	Aggregate Amount Beneficially Owned by Each Reporting Person:
	124,730,358
(12)	Check Box if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions):
	¨
(13)	Percent of Class Represented by Amount in Row (11):
	50.8%
(14)	Type of Reporting Person (See Instructions):
	PN

Note: All share numbers on these cover pages presented on an as-converted basis.

(1) EnerVest, Ltd. (“EnerVest”) may be deemed to have beneficial ownership of 124,730,358 shares of Class A Common Stock, par value $0.0001 per share (the “Class A Common Stock”). Such shares are held (in the amounts set forth below) by EnerVest Energy Institutional Fund XIV-A, L.P., EnerVest Energy Institutional Fund XIV-2A, L.P., EnerVest Energy Institutional Fund XIV-3A, L.P., EnerVest Energy Institutional Fund XIV-WIC, L.P., EnerVest Energy Institutional Fund XIV-C, L.P. and EnerVest Energy Institutional Fund XIV-C-AIV, L.P. (collectively, the “Record Holders”). The relationship of the parties filing this Schedule 13D is described in Item 2.

CUSIP No. 559663109 Schedule 13D  Page 3 of 19 Pages

(1)	Name of Filing Parties:
	I.R.S. Identification No. of Above Persons (entities only):
	EnerVest Management GP, L.C./76-0629541
(2)	Check the Appropriate Box if a Member of a Group (See Instructions):
	(a) ¨
	(b) x
(3)	SEC Use Only:
(4)	Source of Funds (See Instructions):  OO
(5)	Check Box if Disclosure of Legal Proceedings is Required Pursuant to Items 2(d) or 2(e):  ¨
(6)	Citizenship or Place of Organization:
	Texas, U.S.

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:	(7)	Sole Voting Power          0
	(8)	Shared Voting Power          124,730,358 (1)
	(9)	Sole Dispositive Power          0
	(10)	Shared Dispositive Power          124,730,358 (1)

(11)	Aggregate Amount Beneficially Owned by Each Reporting Person:
	124,730,358
(12)	Check Box if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions):
	¨
(13)	Percent of Class Represented by Amount in Row (11):
	50.8%
(14)	Type of Reporting Person (See Instructions):
	OO

(1) EnerVest Management GP, L.C. (“EVM GP”) may be deemed to have beneficial ownership of 124,730,358 shares of Class A Common Stock. Such shares are held (in the amounts set forth below) by the Record Holders. The relationship of the parties filing this Schedule 13D is described in Item 2.

CUSIP No. 559663109 Schedule 13D  Page 4 of 19 Pages

(1)	Name of Filing Parties:
	I.R.S. Identification No. of Above Persons (entities only):
	EnerVest Energy Institutional Fund XIV-A, L.P. / 47-2575103
(2)	Check the Appropriate Box if a Member of a Group (See Instructions):
	(a) ¨
	(b) x
(3)	SEC Use Only:
(4)	Source of Funds (See Instructions):  OO
(5)	Check Box if Disclosure of Legal Proceedings is Required Pursuant to Items 2(d) or 2(e):  ¨
(6)	Citizenship or Place of Organization:
	Delaware, U.S.

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:	(7)	Sole Voting Power          0
	(8)	Shared Voting Power           59,688,294 (1)
	(9)	Sole Dispositive Power          0
	(10)	Shared Dispositive Power          59,688,294 (1)

(11)	Aggregate Amount Beneficially Owned by Each Reporting Person:
	57,688,294
(12)	Check Box if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions):
	¨
(13)	Percent of Class Represented by Amount in Row (11):
	24.3%
(14)	Type of Reporting Person (See Instructions):
	PN

(1) EnerVest Energy Institutional Fund XIV-A, L.P. (“EV XIV-A”) owns of record 59,688,294 shares of the Issuer’s Class B Common Stock, par value $0.0001 per share (the “Class B Common Stock”), each share of which, pursuant to the Amended and Restated Limited Liability Company Agreement of Magnolia Oil & Gas Parent LLC (“Magnolia LLC”), dated as of July 31, 2018 (the “LLC Agreement”), may be exchanged (by exchanging one unit in Magnolia LLC (a “Unit”) and one share of Class B Common Stock) for one share of Class A Common Stock. The ability to exchange Class B Common Stock for Class A Common Stock and the relationship of the parties filing this Schedule 13D is described in Item 2.

CUSIP No. 559663109 Schedule 13D  Page 5 of 19 Pages

(1)	Name of Filing Parties:
	I.R.S. Identification No. of Above Persons (entities only):
	EnerVest Energy Institutional Fund XIV-2A, L.P. / 81-2214106
(2)	Check the Appropriate Box if a Member of a Group (See Instructions):
	(a) ¨
	(b) x
(3)	SEC Use Only:
(4)	Source of Funds (See Instructions):  OO
(5)	Check Box if Disclosure of Legal Proceedings is Required Pursuant to Items 2(d) or 2(e):  ¨
(6)	Citizenship or Place of Organization:
	Delaware, U.S.

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:	(7)	Sole Voting Power          0
	(8)	Shared Voting Power           11,818,715 (1)
	(9)	Sole Dispositive Power          0
	(10)	Shared Dispositive Power          11,818,715 (1)

(11)	Aggregate Amount Beneficially Owned by Each Reporting Person:
	11,818,715
(12)	Check Box if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions):
	¨
(13)	Percent of Class Represented by Amount in Row (11):
	4.8%
(14)	Type of Reporting Person (See Instructions):
	PN

(1) EnerVest Energy Institutional Fund XIV-2A, L.P. (“EV XIV-2A”) owns of record 11,818,715 shares of the Issuer’s Class B Common Stock, each share of which, pursuant to the LLC Agreement may be exchanged (by exchanging one Unit and one share of Class B Common Stock) for one share of Class A Common Stock. The ability to exchange Class B Common Stock for Class A Common Stock and the relationship of the parties filing this Schedule 13D is described in Item 2.

CUSIP No. 559663109 Schedule 13D  Page 6 of 19 Pages

(1)	Name of Filing Parties:
	I.R.S. Identification No. of Above Persons (entities only):
	EnerVest Energy Institutional Fund XIV-3A, L.P. / 81-2835063
(2)	Check the Appropriate Box if a Member of a Group (See Instructions):
	(a) ¨
	(b) x
(3)	SEC Use Only:
(4)	Source of Funds (See Instructions):  OO
(5)	Check Box if Disclosure of Legal Proceedings is Required Pursuant to Items 2(d) or 2(e):  ¨
(6)	Citizenship or Place of Organization:
	Delaware, U.S.

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:	(7)	Sole Voting Power          0
	(8)	Shared Voting Power           11,654,091 (1)
	(9)	Sole Dispositive Power          0
	(10)	Shared Dispositive Power          11,654,091 (1)

(11)	Aggregate Amount Beneficially Owned by Each Reporting Person:
	11,654,091
(12)	Check Box if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions):
	¨
(13)	Percent of Class Represented by Amount in Row (11):
	4.7%
(14)	Type of Reporting Person (See Instructions):
	PN

(1) EnerVest Energy Institutional Fund XIV-3A, L.P. (“EV XIV-3A”) owns of record 11,654,091 shares of the Issuer’s Class B Common Stock, each share of which, pursuant to the LLC Agreement may be exchanged (by exchanging one Unit and one share of Class B Common Stock) for one share of Class A Common Stock. The ability to exchange Class B Common Stock for Class A Common Stock and the relationship of the parties filing this Schedule 13D is described in Item 2.

CUSIP No. 559663109 Schedule 13D  Page 7 of 19 Pages

(1)	Name of Filing Parties:
	I.R.S. Identification No. of Above Persons (entities only):
	EnerVest Energy Institutional Fund XIV-WIC, L.P. / 61-1751769
(2)	Check the Appropriate Box if a Member of a Group (See Instructions):
	(a) ¨
	(b) x
(3)	SEC Use Only:
(4)	Source of Funds (See Instructions):  OO
(5)	Check Box if Disclosure of Legal Proceedings is Required Pursuant to Items 2(d) or 2(e):  ¨
(6)	Citizenship or Place of Organization:
	Delaware, U.S.

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:	(7)	Sole Voting Power          0
	(8)	Shared Voting Power           623,539 (1)
	(9)	Sole Dispositive Power          0
	(10)	Shared Dispositive Power          623,539 (1)

(11)	Aggregate Amount Beneficially Owned by Each Reporting Person:
	623,539
(12)	Check Box if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions):
	¨
(13)	Percent of Class Represented by Amount in Row (11):
	Less than 1%
(14)	Type of Reporting Person (See Instructions):
	PN

(1) EnerVest Energy Institutional Fund XIV-WIC, L.P. (“EV XIV-WIC”) owns of record 623,539 shares of the Issuer’s Class B Common Stock, each share of which, pursuant to the LLC Agreement may be exchanged (by exchanging one Unit and one share of Class B Common Stock) for one share of Class A Common Stock. The ability to exchange Class B Common Stock for Class A Common Stock and the relationship of the parties filing this Schedule 13D is described in Item 2.

CUSIP No. 559663109 Schedule 13D  Page 8 of 19 Pages

(1)	Name of Filing Parties:
	I.R.S. Identification No. of Above Persons (entities only):
	EnerVest Energy Institutional Fund XIV-C, L.P. / 61-1751620
(2)	Check the Appropriate Box if a Member of a Group (See Instructions):
	(a) ¨
	(b) x
(3)	SEC Use Only:
(4)	Source of Funds (See Instructions):  OO
(5)	Check Box if Disclosure of Legal Proceedings is Required Pursuant to Items 2(d) or 2(e):  ¨
(6)	Citizenship or Place of Organization:
	Delaware, U.S.

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:	(7)	Sole Voting Power          0
	(8)	Shared Voting Power           34,278,184 (1)
	(9)	Sole Dispositive Power          0
	(10)	Shared Dispositive Power          34,278,184 (1)

(11)	Aggregate Amount Beneficially Owned by Each Reporting Person:
	34,278,184
(12)	Check Box if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions):
	¨
(13)	Percent of Class Represented by Amount in Row (11):
	14.0%
(14)	Type of Reporting Person (See Instructions):
	PN

(1) EnerVest Energy Institutional Fund XIV-C, L.P. (“EV XIV-C”) owns of record 34,278,184 shares of Class A Common Stock. The relationship of the parties filing this Schedule 13D is described in Item 2.

CUSIP No. 559663109 Schedule 13D  Page 9 of 19 Pages

(1)	Name of Filing Parties:
	I.R.S. Identification No. of Above Persons (entities only):
	EnerVest Energy Institutional Fund XIV-C-AIV, L.P. / 83-1342712
(2)	Check the Appropriate Box if a Member of a Group (See Instructions):
	(a) ¨
	(b) x
(3)	SEC Use Only:
(4)	Source of Funds (See Instructions):  OO
(5)	Check Box if Disclosure of Legal Proceedings is Required Pursuant to Items 2(d) or 2(e):  ¨
(6)	Citizenship or Place of Organization:
	Delaware, U.S.

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:	(7)	Sole Voting Power          0
	(8)	Shared Voting Power           6,667,535 (1)
	(9)	Sole Dispositive Power          0
	(10)	Shared Dispositive Power          6,667,535 (1)

(11)	Aggregate Amount Beneficially Owned by Each Reporting Person:
	6,667,535
(12)	Check Box if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions):
	¨
(13)	Percent of Class Represented by Amount in Row (11):
	2.7%
(14)	Type of Reporting Person (See Instructions):
	PN

(1) EnerVest Energy Institutional Fund XIV-C-AIV, L.P. (“EV XIV-C-AIV”) owns of record 6,667,535 shares of the Issuer’s Class B Common Stock, each share of which, pursuant to the LLC Agreement may be exchanged (by exchanging one Unit and one share of Class B Common Stock) for one share of Class A Common Stock. The ability to exchange Class B Common Stock for Class A Common Stock and the relationship of the parties filing this Schedule 13D is described in Item 2.

CUSIP No. 559663109 Schedule 13D  Page 10 of 19 Pages

(1)	Name of Filing Parties:
	I.R.S. Identification No. of Above Persons (entities only):
	John B. Walker
(2)	Check the Appropriate Box if a Member of a Group (See Instructions):
	(a) ¨
	(b) x
(3)	SEC Use Only:
(4)	Source of Funds (See Instructions):  OO
(5)	Check Box if Disclosure of Legal Proceedings is Required Pursuant to Items 2(d) or 2(e):  ¨
(6)	Citizenship or Place of Organization:
	United States

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:	(7)	Sole Voting Power          0 (1)
	(8)	Shared Voting Power           124,730,358 (2)
	(9)	Sole Dispositive Power           0 (1)
	(10)	Shared Dispositive Power           124,730,358 (2)

(11)	Aggregate Amount Beneficially Owned by Each Reporting Person:
	124,730,358
(12)	Check Box if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions):
	¨
(13)	Percent of Class Represented by Amount in Row (11):
	50.8%
(14)	Type of Reporting Person (See Instructions):
	IN

(1)       Mr. Walker is the sole owner of 11,000 restricted stock units (“RSUs”) granted under the Magnolia Oil & Gas Corporation Long Term Incentive Plan. Each RSU represents a contingent right to receive one share of Class A Common Stock. The RSUs will vest on the one-year anniversary of the vesting commencement date, August 1, 2019 and, as such, Mr. Walker may not acquire beneficial ownership of such securities within 60 days of the date hereof.

(2)        As described in Item 5 below, Mr. Walker, by virtue of his indirect ownership and status as a principal of EVM GP, EnerVest’s general partner, may be deemed to have beneficial ownership of an aggregate of 124,730,358 shares of Class A Common Stock, which shares are owned of record by the Record Holders. The relationship of the parties filing this Schedule 13D is described in Item 2.

CUSIP No. 559663109 Schedule 13D  Page 11 of 19 Pages

(1)	Name of Filing Parties:
	I.R.S. Identification No. of Above Persons (entities only):
	EnerVest Investment Services, L.L.C. /27-4656496
(2)	Check the Appropriate Box if a Member of a Group (See Instructions):
	(a) ¨
	(b) x
(3)	SEC Use Only:
(4)	Source of Funds (See Instructions):  OO
(5)	Check Box if Disclosure of Legal Proceedings is Required Pursuant to Items 2(d) or 2(e):  ¨
(6)	Citizenship or Place of Organization:
	Delaware, U.S.

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:	(7)	Sole Voting Power          0
	(8)	Shared Voting Power          124,730,358 (1)
	(9)	Sole Dispositive Power           0
	(10)	Shared Dispositive Power           124,730,358 (1)

(11)	Aggregate Amount Beneficially Owned by Each Reporting Person:
	124,730,358
(12)	Check Box if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions):
	¨
(13)	Percent of Class Represented by Amount in Row (11):
	50.8%
(14)	Type of Reporting Person (See Instructions):
	IA

(1) EnerVest Investment Services, L.L.C. (“EIS, LLC”) may be deemed to have beneficial ownership of 124,730,358 shares of Class A Common Stock, which shares are owned of record by the Record Holders. The relationship of the parties filing this Schedule 13D is described in Item 2.

Note: All share numbers on these cover pages presented on an as-converted basis.

CUSIP No. 559663109 Schedule 13D  Page 12 of 19 Pages

ITEM 1. SECURITY AND ISSUER

This Amendment No. 2 to Schedule 13D (this “Amendment”) relates to shares of Class A common stock, par value $0.0001 per share (the “Class A Common Stock”) of Magnolia Oil & Gas, Corporation, a Delaware corporation (the “Issuer”). Capitalized terms used but not defined herein shall have the meanings ascribed to such terms in the Schedule 13D.

The address of the Issuer’s principal executive offices is 1001 Fannin Street, Suite 400, Houston, Texas 77002.

ITEM 2. IDENTITY AND BACKGROUND

The disclosure provided in Item 2 of the Schedule 13D amended hereby is updated to include the following additional disclosure:

(a) On September 4, 2018, 1,243,630 shares of Class A Common Stock and 3,256,370 shares of Class B Common Stock were earned by, and awarded to, the Record Holders, in each case pursuant to the earn-out provisions under the Contribution Agreement. Such shares were issued in the amounts and to the Record Holders set forth below:

Holder	Shares of Class A Common Stock Received		Shares of Class B Common Stock Received
EV XIV-A		0		2,165,520
EV XIV-2A		0		402,100
EV XIV-3A		0		424,240
EV XIV-WIC		0		22,620
EV XIV-C		1,243,630		0
EV XIV-C-AIV		0		241,890

CUSIP No. 559663109 Schedule 13D  Page 13 of 19 Pages

ITEM 5. INTEREST IN SECURITIES OF THE ISSUER

(a) and (b)

Reporting Persons	Number of Shares With Sole Voting  Power		Number of Shares With Shared Voting  Power		Sole Beneficial Ownership		Shared Beneficial Ownership		Percentage of Class Beneficially Owned
EnerVest		0		124,730,358		0		124,730,358		50.8	%
EVM GP		0		124,730,358		0		124,730,358		50.8	%
EV XIV-A		0		59,688,294		0		59,688,294		24.3	%
EV XIV-2A		0		11,818,715		0		11,818,715		4.8	%
EV XIV-3A		0		11,654,091		0		11,654,091		4.7	%
EV XIV-WIC		0		623,539		0		623,539		Less than 1%
EV XIV-C		0		34,278,184		0		34,278,184		14.0	%
EV XIV-C-AIV		0		6,667,535		0		6,667,535		2.7	%
John B. Walker		0		124,730,358		0		124,730,358		50.8	%
EIS, LLC		0		124,730,358		0		124,730,358		50.8	%

*All share numbers presented in this table assume full conversion of Class B Common Stock (with the Units) to Class A Common Stock.

The filing of this Schedule 13D shall not be construed as an admission by any Filing Party that, for the purpose of Section 13(d) or 13(g) of the Act, such Filing Party is the beneficial owner of any securities covered by this Schedule 13D other than securities owned of record by such Filing Party.

CUSIP No. 559663109 Schedule 13D  Page 14 of 19 Pages

Except as indicated in this Item 5 or as set forth herein, neither the Filing Parties nor, to the best knowledge of the Filing Parties, any of the Listed Persons owns beneficially, or has any right to acquire, directly or indirectly, any additional shares of Class A Common Stock or Class B Common Stock. Pursuant to the contribution agreement in connection with the Transaction (the “Contribution Agreement”), for a period of five years following the Closing, the Record Holders will be entitled to receive an aggregate of up to 13,000,000 additional shares of Class A Common Stock or Class B Common Stock based on the achievement of certain EBITDA and free cash flow or stock price thresholds (9,000,000 of which shares have been earned and subsequently distributed prior to the date hereof). Because the earning of such shares is wholly dependent on fluctuating prices and certain profitability metrics, there can be no assurance that any additional shares will be earned, or, if such shares are earned, that such shares are capable of being earned within sixty days from the date hereof. In addition, pursuant to the terms of the Non-Compete entered into in connection with the Transaction, Issuer agreed to issue up to 4,000,000 shares of Class A Common Stock to an affiliate of EnerVest if certain stock price thresholds are met. Upon such issuance, certain Listed Persons may be granted a portion of such issued Class A Common Stock by such affiliate in connection with services provided to the Issuer with respect to the assets acquired by the Issuer pursuant to the Transaction. Such shares are not capable of being earned within sixty days from the date hereof.

(c) Other than as acquired pursuant to the Transaction and otherwise reported herein (including as may have been reported in EnerVest’s initial Schedule 13D filed with the SEC on August 10, 2018 or in any amendment thereto), none of the Filing Parties has effected any transactions involving the Class A Common Stock in the 60 days prior to filing this Schedule 13D.

(d) No person other than the Filing Parties has the right to receive or the power to direct the receipt of distributions from, or the proceeds from the sale of, the shares of Class A Common Stock and Class B Common Stock owned of record by the EnerVest entities.

(e) Not applicable.

CUSIP No. 559663109 Schedule 13D  Page 15 of 19 Pages

ITEM 7. MATERIAL TO BE FILED AS EXHIBITS

7.1 Stockholder Agreement, dated as of July 31, 2018, by and among Magnolia Oil & Gas Corporation, EnerVest Energy Institutional Fund XIV-A, L.P., EnerVest Energy Institutional Fund XIV-WIC, L.P., EnerVest Energy Institutional Fund XIV-2A, L.P., EnerVest Energy Institutional Fund XIV-3A, L.P., EnerVest Energy Institutional Fund XIV-C, L.P., EnerVest Energy Institutional Fund XIV-C-AIV, L.P. and TPG Pace Energy Sponsor, LLC (incorporated by reference to Exhibit 4.3 to the Issuer’s Current Report on Form 8-K, filed with the SEC on August 6, 2018).

7.2 Registration Rights Agreement, dated as of July 31, 2018, by and among Magnolia Oil & Gas Corporation, EnerVest Energy Institutional Fund XIV-A, L.P., EnerVest Energy Institutional Fund XIV-WIC, L.P., EnerVest Energy Institutional Fund XIV-2A, L.P., EnerVest Energy Institutional Fund XIV-3A, L.P., EnerVest Energy Institutional Fund XIV-C, L.P., EnerVest Energy Institutional Fund XIV-C-AIV, L.P., TPG Pace Energy Sponsor, LLC, Arcilia Acosta, Edward Djerejian, Chad Leat and Dan F. Smith (incorporated by reference to Exhibit 4.3 to the Issuer’s Current Report on Form 8-K, filed with the SEC on August 6, 2018).

7.3 Amended and Restated Limited Liability Company Agreement of Magnolia Oil & Gas Parent LLC, dated as of July 31, 2018 (incorporated by reference to Exhibit 10.2 to the Issuer’s Current Report on Form 8-K, filed with the SEC on August 6, 2018).

7.4 Non-Competition Agreement, by and between Magnolia Oil & Gas Corporation and EnerVest Ltd., dated as of July 31, 2018 (incorporated by reference to Exhibit 10.3 to the Issuer’s Current Report on Form 8-K, filed with the SEC on August 6, 2018).

7.5 Contribution and Merger Agreement, dated as of March 20, 2018, by and among TPG Pace Energy Holdings Corp., TPG Pace Energy Parent LLC, EnerVest Energy Institutional Fund XIV-A, L.P., EnerVest Energy Institutional Fund XIV-WIC, L.P., EnerVest Energy Institutional Fund XIV-2A, L.P., and EnerVest Energy Institutional Fund XIV-3A, L.P. and EnerVest Energy Institutional Fund XIV-C, L.P. (incorporated by reference to Exhibit 2.1 to the Issuer’s Current Report on Form 8-K, filed with the SEC on March 20, 2018).

7.6 Joint Filing Agreement (incorporated by reference to Exhibit 7.6 to EnerVest’s Schedule 13D, filed with the SEC on August 10, 2018).

CUSIP No. 559663109 Schedule 13D  Page 16 of 19 Pages

SIGNATURE

After reasonable inquiry and to the best of its knowledge and belief, each of the undersigned certifies that the information set forth in this Schedule 13D with respect to the undersigned is true, complete, and correct.

Dated as of September 6, 2018

EnerVest Management GP, L.C.
By:	/s/ John B. Walker
Name:	John B. Walker
Title:	Chief Executive Officer
EnerVest, Ltd.
By: EnerVest Management GP, L.C., its General Partner
By:	/s/ John B. Walker
Name:	John B. Walker
Title:	Chief Executive Officer
EnerVest Energy Institutional Fund XIV-A, L.P.
By: EVFA GP XIV, LLC, its Managing General Partner
By: EnerVest, Ltd., its sole member
By: EnerVest Management GP, L.C., its General Partner
By:	/s/ John B. Walker
Name:	John B. Walker
Title:	Chief Executive Officer
EnerVest Energy Institutional Fund XIV-2A, L.P.
By: EVFA XIV-2A, LLC, its Managing General Partner
By: EnerVest, Ltd., its sole member
By: EnerVest Management GP, L.C., its General Partner
By:	/s/ John B. Walker
Name:	John B. Walker
Title:	Chief Executive Officer

CUSIP No. 559663109 Schedule 13D  Page 17 of 19 Pages

EnerVest Energy Institutional Fund XIV-3A, L.P.
By: EVFA XIV-3A, LLC, its Managing General Partner
By: EnerVest, Ltd., its sole member
By: EnerVest Management GP, L.C., its General Partner
By:	/s/ John B. Walker
Name:	John B. Walker
Title:	Chief Executive Officer
EnerVest Energy Institutional Fund XIV-WIC, L.P.
By: EnerVest Holding XIV, LLC, its Managing General Partner
By: EnerVest, Ltd., its sole member
By: EnerVest Management GP, L.C., its General Partner
By:	/s/ John B. Walker
Name:	John B. Walker
Title:	Chief Executive Officer
EnerVest Energy Institutional Fund XIV-C, L.P.
By: EVFC GP XIV, LLC, its Managing General Partner
By: EnerVest, Ltd., its sole member
By: EnerVest Management GP, L.C., its General Partner
By:	/s/ John B. Walker
Name:	John B. Walker
Title:	Chief Executive Officer
EnerVest Energy Institutional Fund XIV-C-AIV, L.P.
By: EVFC GP XIV, LLC, its Managing General Partner
By: EnerVest, Ltd., its sole member
By: EnerVest Management GP, L.C., its General Partner
By:	/s/ John B. Walker
Name:	John B. Walker
Title:	Chief Executive Officer

CUSIP No. 559663109 Schedule 13D  Page 18 of 19 Pages

EnerVest Investment Services, L.L.C.
By: EnerVest Holding, L.P., its Sole Member
By: EnerVest Operating, L.L.C., its General Partner
By:	/s/ John B. Walker
Name:	John B. Walker
Title:	Executive Chairman
/s/ John B. Walker
John B. Walker

CUSIP No. 559663109 Schedule 13D  Page 19 of 19 Pages

EXHIBIT INDEX

EXHIBIT NO.	DESCRIPTION
7.1	Stockholder Agreement, dated as of July 31, 2018, by and among Magnolia Oil & Gas Corporation, EnerVest Energy Institutional Fund XIV-A, L.P.,  EnerVest Energy Institutional Fund XIV-WIC, L.P., EnerVest Energy Institutional Fund XIV-2A, L.P., EnerVest Energy Institutional Fund XIV-3A, L.P., EnerVest Energy Institutional Fund XIV-C, L.P., EnerVest Energy Institutional Fund XIV-C-AIV, L.P. and TPG Pace Energy Sponsor, LLC (incorporated by reference to Exhibit 4.3 to the Issuer’s Current Report on Form 8-K, filed with the SEC on August 6, 2018).
7.2	Registration Rights Agreement, dated as of July 31, 2018, by and among Magnolia Oil & Gas Corporation, EnerVest Energy Institutional Fund XIV-A,  L.P., EnerVest Energy Institutional Fund XIV-WIC, L.P., EnerVest Energy Institutional Fund XIV-2A, L.P., EnerVest Energy Institutional Fund XIV-3A, L.P., EnerVest Energy Institutional Fund XIV-C,  L.P., EnerVest Energy Institutional Fund XIV-C-AIV, L.P., TPG Pace Energy Sponsor, LLC, Arcilia Acosta, Edward Djerejian, Chad Leat and Dan F. Smith (incorporated by reference to Exhibit 4.3 to the Issuer’s Current Report on Form 8-K, filed with the SEC on August 6, 2018).
7.3	Amended and Restated Limited Liability Company Agreement of Magnolia Oil & Gas Parent LLC, dated as of July 31, 2018 (incorporated by reference to Exhibit 10.2 to the Issuer’s Current Report on Form 8-K, filed with the SEC on August 6, 2018).
7.4	Non-Competition Agreement, by and between Magnolia Oil & Gas Corporation and EnerVest Ltd., dated as of July 31, 2018 (incorporated by reference to Exhibit 10.3 to the Issuer’s Current Report on Form 8-K, filed with the SEC on August 6, 2018).
7.5	Contribution and Merger Agreement, dated as of March 20, 2018, by and among TPG Pace Energy Holdings Corp., TPG Pace Energy Parent LLC, EnerVest Energy Institutional Fund XIV-A, L.P., EnerVest Energy Institutional Fund XIV-WIC, L.P., EnerVest Energy Institutional Fund XIV-2A, L.P., and EnerVest Energy Institutional Fund XIV-3A, L.P. and EnerVest Energy Institutional Fund XIV-C, L.P.(incorporated by reference to Exhibit 2.1 to the Issuer’s Current Report on Form 8-K, filed with the SEC on March 20, 2018).
7.6	Joint Filing Agreement (incorporated by reference to Exhibit 7.6 to EnerVest’s Schedule 13D, filed with the SEC on August 10, 2018).