Sec Form 4 Filing - PHILLIPS D MARTIN @ Montage Resources Corp - 2020-11-13

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person PHILLIPS D MARTIN 2. Issuer Name and Ticker or Trading Symbol Montage Resources Corp [ MR] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 122 WEST JOHN CARPENTER, FREEWAY, SUITE 300 3. Date of Earliest Transaction (MM/DD/YY) 11/13/2020 (Street) IRVING, TX75039 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 11/13/2020 D( 1 ) 31,515 D 0 D Common Stock 11/13/2020 D( 1 ) 14,051,904 D 0 ( 3 ) ( 4 ) ( 5 ) I See Footnotes ( 3 ) ( 4 ) ( 5 )

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other PHILLIPS D MARTIN 122 WEST JOHN CARPENTER FREEWAY, SUITE 300 IRVING, TX75039 X Signatures /s/ Frank E. Day, Attorney-in-fact 11/13/2020 Signature of Reporting Person Date

Explanation of Responses:

( 1 )On November 13, 2020, pursuant to the Agreement and Plan of Merger dated as of August 12, 2020 (the "Merger Agreement"), by and among Montage Resources Corporation (the "Issuer") and Southwestern Energy Company ("Southwestern"), the Issuer merged with and into Southwestern, with Southwestern continuing as the surviving corporation (the "Merger"). Pursuant to the Merger Agreement, each issued and outstanding share of common stock of the Issuer, par value $0.01 per share, outstanding as of immediately prior to the effective time of the Merger was converted into the right to receive 1.8656 shares of Southwestern common stock, par value $0.01 per share ("Southwestern Common Stock"). ( 2 )On November 12, 2020 (the day prior to the effective time of the Merger), the closing price of one share of Southwestern Common Stock was $2.86. ( 3 )These securities were collectively directly held by EnCap Energy Capital Fund VIII, L.P. ("EnCap Fund VIII"), EnCap Energy Capital Fund VIII Co-Investors, L.P. ("EnCap Fund VIII Co-Invest"), EnCap Energy Capital Fund IX, L.P. ("EnCap Fund IX") and TPR Residual Assets, LLC ("TPR Residual"). ( 4 )(Continued from Footnote 2) TPR Residual is member-managed by EnCap Fund IX. EnCap Partners GP, LLC ("EnCap Partners GP") is the sole general partner of EnCap Partners, LP, which is the managing member of EnCap Investments Holdings, LLC, which is the sole member of EnCap Investments GP, L.L.C., which is the sole general partner of EnCap Investments L.P. EnCap Investments L.P. is the sole general partner of EnCap Equity Fund VIII GP, L.P. ("EnCap Fund VIII GP") and EnCap Equity Fund IX GP, L.P. ("EnCap Fund IX GP"). EnCap Fund VIII GP is the sole general partner of each of EnCap Fund VIII and EnCap Fund VIII Co-Invest. EnCap Fund IX GP is the sole general partner of EnCap Fund IX. ( 5 )(Continued from Footnote 3) The Reporting Person is a Managing Partner of EnCap Partners GP and therefore may be deemed to have beneficially owned the reported securities.

Remarks: This form represents an Exit Form 4 due to the merger of the Issuer with and into Southwestern.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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