Sec Form 3 Filing - Strong Geoffrey @ Vistra Energy Corp - 2017-05-08

FORM 3 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 Strong Geoffrey 2. Issuer Name and Ticker or Trading Symbol Vistra Energy Corp [ VST] 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) C/O APOLLO MANAGEMENT, L.P., 9 WEST 57TH STREET, 43RD FLOOR 3. Date of Earliest Transaction (MM/DD/YY) 05/08/2017 (Street) NEW YORK, NY10019 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

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 Strong Geoffrey C/O APOLLO MANAGEMENT, L.P. 9 WEST 57TH STREET, 43RD FLOOR NEW YORK, NY10019 X Signatures /s/ Geoffrey Strong 05/08/2017 Signature of Reporting Person Date

Explanation of Responses:

Remarks: Geoffrey Strong is associated with Apollo Management, L.P.("Apollo Management") and its affiliate, Apollo Management Holdings, L.P. ("Management Holdings"). Affiliates of Apollo Management and Management Holdings serve as investment managers and investment advisors that indirectly or directly provide investment management services or portfolio management services to, and in some cases serve as general partners of, various entities that hold shares of common stock, par value $0.01, of Vistra Energy Corp. (the "Issuer"). As such, Apollo Management, Management Holdings and their affiliated investment managers or investment advisors may be deemed to beneficially own the shares of common stock of the Issuer held by the entities directly or indirectly managed or advised by the investment managers and advisors affiliated with Apollo Management or Management Holdings. This report does not include any securities of the Issuer held by any such entities or that may be deemed to be beneficially owned by Apollo Management, Management Holdings or any of the other Apollo investment managers or investment advisors affiliated with Apollo Management or Management Holdings, and Mr. Strong disclaims beneficial ownership of all such securities. This report shall not be deemed an admission that Mr. Strong is the beneficial owner of, or has any pecuniary interest in, such securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.

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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