VST

SEC source: 0001209191-18-040588 · doc4.xml · nonDerivative · entry 1

Zimmerman Bruce · CIK 0001720536 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,870

SEC source: 0001209191-18-039570 · doc4.xml · nonDerivative · entry 1

HELM SCOTT B · CIK 0001711936 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 29,367

F1 · kind: The purchase reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan established by the reporting person on November 10, 2017.

SEC source: 0001209191-18-038603 · doc4.xml · nonDerivative · entry 1

HELM SCOTT B · CIK 0001711936 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 29,167

F1 · kind: The purchase reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan established by the reporting person on November 10, 2017.

SEC source: 0001209191-18-037515 · doc4.xml · nonDerivative · entry 1

HELM SCOTT B · CIK 0001711936 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 28,967

F1 · kind: The purchase reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan established by the reporting person on November 10, 2017.

SEC source: 0001209191-18-035979 · doc4.xml · nonDerivative · entry 1

HELM SCOTT B · CIK 0001711936 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 28,767

F1 · kind: The purchase reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan established by the reporting person on November 10, 2017.

SEC source: 0001209191-18-033899 · doc4.xml · nonDerivative · entry 1

HELM SCOTT B · CIK 0001711936 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 28,567

F1 · kind: The purchase reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan established by the reporting person on November 10, 2017.

SEC source: 0001209191-18-032486 · doc4.xml · nonDerivative · entry 1

HELM SCOTT B · CIK 0001711936 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 28,367

F1 · kind: The purchase reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan established by the reporting person on November 10, 2017.

SEC source: 0001209191-18-030368 · doc4.xml · nonDerivative · entry 1

HELM SCOTT B · CIK 0001711936 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 28,167

F1 · kind: The purchase reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan established by the reporting person on November 10, 2017.

SEC source: 0001209191-18-028743 · doc4.xml · nonDerivative · entry 1

HELM SCOTT B · CIK 0001711936 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 27,967

F1 · kind: The purchase reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan established by the reporting person on November 10, 2017.

SEC source: 0001209191-18-027518 · doc4.xml · nonDerivative · entry 1

BARBAS PAUL M · CIK 0001176453 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 32,054

F1 · date: Grants of restricted stock units approved by Issuer's Board of Directors on May 1, 2018.

F2 · kind: The restricted stock units were issued in connection with the Reporting Person's director compensation, and the number of units issued was calculated based on the closing stock price of the Issuer's common stock of $22.85 on April 30, 2018. Each restricted stock unit represents a contingent right to receive one share of Vistra Energy Corp. common stock. The restricted stock units vest in full on May 1, 2019.

SEC source: 0001209191-18-027521 · doc4.xml · nonDerivative · entry 1

Hunter Jeff D · CIK 0001704101 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 28,998

F1 · date: Grants of restricted stock units approved by Issuer's Board of Directors on May 1, 2018.

F2 · kind: The restricted stock units were issued in connection with the Reporting Person's director compensation, and the number of units issued was calculated based on the closing stock price of the Issuer's common stock of $22.85 on April 30, 2018. Each restricted stock unit represents a contingent right to receive one share of Vistra Energy Corp. common stock. The restricted stock units vest in full on May 1, 2019.

SEC source: 0001209191-18-027524 · doc4.xml · nonDerivative · entry 1

SULT JOHN R · CIK 0001342932 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 36,596

F1 · date: Grants of restricted stock units approved by Issuer's Board of Directors on May 1, 2018.

F2 · kind: The restricted stock units were issued in connection with the Reporting Person's director compensation, and the number of units issued was calculated based on the closing stock price of the Issuer's common stock of $22.85 on April 30, 2018. Each restricted stock unit represents a contingent right to receive one share of Vistra Energy Corp. common stock. The restricted stock units vest in full on May 1, 2019.

SEC source: 0001209191-18-027520 · doc4.xml · nonDerivative · entry 2

HELM SCOTT B · CIK 0001711936 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 27,767

F2 · date: Grants of restricted stock units approved by Issuer's Board of Directors on May 1, 2018.

F3 · kind: The restricted stock units were issued in connection with the Reporting Person's director compensation, and the number of units issued was calculated based on the closing stock price of the Issuer's common stock of $22.85 on April 30, 2018. Each restricted stock unit represents a contingent right to receive one share of Vistra Energy Corp. common stock. The restricted stock units vest in full on May 1, 2019.

SEC source: 0001209191-18-027520 · doc4.xml · nonDerivative · entry 1

HELM SCOTT B · CIK 0001711936 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 17,702

F1 · kind: The purchase reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan established by the reporting person on November 10, 2017.

SEC source: 0001209191-18-027519 · doc4.xml · nonDerivative · entry 1

FERRAIOLI BRIAN K · CIK 0001221429 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 18,671

F1 · date: Grants of restricted stock units approved by Issuer's Board of Directors on May 1, 2018.

F2 · kind: The restricted stock units were issued in connection with the Reporting Person's director compensation, and the number of units issued was calculated based on the closing stock price of the Issuer's common stock of $22.85 on April 30, 2018. Each restricted stock unit represents a contingent right to receive one share of Vistra Energy Corp. common stock. The restricted stock units vest in full on May 1, 2019.

SEC source: 0001209191-18-027517 · doc4.xml · nonDerivative · entry 1

Baiera Gavin R. · CIK 0001605616 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 11,855

F1 · date: Grants of restricted stock units approved by Issuer's Board of Directors on May 1, 2018.

F2 · kind: The restricted stock units were issued in connection with the Reporting Person's director compensation, and the number of units issued was calculated based on the closing stock price of the Issuer's common stock of $22.85 on April 30, 2018. Each restricted stock unit represents a contingent right to receive one share of Vistra Energy Corp. common stock. The restricted stock units vest in full on May 1, 2019.

SEC source: 0001209191-18-027516 · doc4.xml · nonDerivative · entry 1

Ackermann Hilary E. · CIK 0001558582 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 29,718

F1 · date: Grants of restricted stock units approved by Issuer's Board of Directors on May 1, 2018.

F2 · kind: The restricted stock units were issued in connection with the Reporting Person's director compensation, and the number of units issued was calculated based on the closing stock price of the Issuer's common stock of $22.85 on April 30, 2018. Each restricted stock unit represents a contingent right to receive one share of Vistra Energy Corp. common stock. The restricted stock units vest in full on May 1, 2019.

SEC source: 0001209191-18-026026 · doc4.xml · nonDerivative · entry 1

HELM SCOTT B · CIK 0001711936 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 17,502

F1 · kind: The purchase reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan established by the reporting person on November 10, 2017.

SEC source: 0001209191-18-025281 · doc4.xml · nonDerivative · entry 1

HELM SCOTT B · CIK 0001711936 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 17,302

F1 · kind: The purchase reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan established by the reporting person on November 10, 2017.

SEC source: 0001209191-18-024582 · doc4.xml · nonDerivative · entry 1

HELM SCOTT B · CIK 0001711936 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 17,102

F1 · kind: The purchase reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan established by the reporting person on November 10, 2017.

SEC source: 0000899243-18-009958 · doc4.xml · nonDerivative · entry 2

BARBAS PAUL M · CIK 0001176453 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 25,489.104

F1 · kind: Acquired pursuant to the Agreement and Plan of Merger, dated October 29, 2017 (the "Merger Agreement"), pursuant to which Dynegy Inc. ("Dynegy") merged with and into Vistra Energy Corp. (the "Issuer") (the "Merger").

F3 · price: Pursuant to the Merger Agreement, each Dynegy restricted stock unit outstanding immediately prior to the effective time of the Merger converted into an award of restricted stock units with respect to Issuer common stock (with the number of shares appropriately adjusted based on the exchange ratio of 0.652 shares of Issuer common stock for each share of Dynegy common stock). These restricted stock units vest in full on May 18, 2018.

SEC source: 0000899243-18-009958 · doc4.xml · nonDerivative · entry 1

BARBAS PAUL M · CIK 0001176453 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,610

F1 · kind: Acquired pursuant to the Agreement and Plan of Merger, dated October 29, 2017 (the "Merger Agreement"), pursuant to which Dynegy Inc. ("Dynegy") merged with and into Vistra Energy Corp. (the "Issuer") (the "Merger").

F2 · price: Pursuant to the Merger Agreement, each outstanding share of Dynegy common stock held immediately prior to the effective time of the Merger (other than certain excluded shares) converted into 0.652 shares of Issuer common stock.

SEC source: 0001209191-18-024603 · doc4.xml · derivative · entry 1

DOBRY ELIZABETH CHRISTINE · CIK 0001729598 · VP and Controller

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 37,821

Underlying: Common Stock · 37,821 shares

Expires 2027-04-09

F1 · derivative.exercise_date: The option vests 50% 4 years from the grant date with the remaining 50% vesting 5 years from the grant date.

SEC source: 0001209191-18-024604 · doc4.xml · derivative · entry 1

MUSCATO STEPHEN J · CIK 0001728921 · SVP & Chief Commercial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 226,929

Underlying: Common Stock · 226,929 shares

Expires 2027-04-09

F1 · derivative.exercise_date: The option vests 50% 4 years from the grant date with the remaining 50% vesting 5 years from the grant date.

SEC source: 0000899243-18-009957 · doc4.xml · nonDerivative · entry 3

Ackermann Hilary E. · CIK 0001558582 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By Spouse

Disclosed balance after: 652

F1 · kind: Acquired pursuant to the Agreement and Plan of Merger, dated October 29, 2017 (the "Merger Agreement"), pursuant to which Dynegy Inc. ("Dynegy") merged with and into Vistra Energy Corp. (the "Issuer") (the "Merger").

F2 · price: Pursuant to the Merger Agreement, each outstanding share of Dynegy common stock held immediately prior to the effective time of the Merger (other than certain excluded shares) converted into 0.652 shares of Issuer common stock.

SEC source: 0000899243-18-009957 · doc4.xml · nonDerivative · entry 2

Ackermann Hilary E. · CIK 0001558582 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 23,153.104

F1 · kind: Acquired pursuant to the Agreement and Plan of Merger, dated October 29, 2017 (the "Merger Agreement"), pursuant to which Dynegy Inc. ("Dynegy") merged with and into Vistra Energy Corp. (the "Issuer") (the "Merger").

F3 · price: Pursuant to the Merger Agreement, each Dynegy restricted stock unit outstanding immediately prior to the effective time of the Merger converted into an award of restricted stock units with respect to Issuer common stock (with the number of shares appropriately adjusted based on the exchange ratio of 0.652 shares of Issuer common stock for each share of Dynegy common stock). These restricted stock units vest in full on May 18, 2018.

SEC source: 0000899243-18-009957 · doc4.xml · nonDerivative · entry 1

Ackermann Hilary E. · CIK 0001558582 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 13,274

F1 · kind: Acquired pursuant to the Agreement and Plan of Merger, dated October 29, 2017 (the "Merger Agreement"), pursuant to which Dynegy Inc. ("Dynegy") merged with and into Vistra Energy Corp. (the "Issuer") (the "Merger").

F2 · price: Pursuant to the Merger Agreement, each outstanding share of Dynegy common stock held immediately prior to the effective time of the Merger (other than certain excluded shares) converted into 0.652 shares of Issuer common stock.

SEC source: 0000899243-18-009956 · doc4.xml · nonDerivative · entry 2

SULT JOHN R · CIK 0001342932 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 30,031.104

F1 · kind: Acquired pursuant to the Agreement and Plan of Merger, dated October 29, 2017 (the "Merger Agreement"), pursuant to which Dynegy Inc. ("Dynegy") merged with and into Vistra Energy Corp. (the "Issuer") (the "Merger").

F3 · price: Pursuant to the Merger Agreement, each Dynegy restricted stock unit outstanding immediately prior to the effective time of the Merger converted into an award of restricted stock units with respect to Issuer common stock (with the number of shares appropriately adjusted based on the exchange ratio of 0.652 shares of Issuer common stock for each share of Dynegy common stock). These restricted stock units vest in full on May 18, 2018.

SEC source: 0000899243-18-009956 · doc4.xml · nonDerivative · entry 1

SULT JOHN R · CIK 0001342932 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 20,152

F1 · kind: Acquired pursuant to the Agreement and Plan of Merger, dated October 29, 2017 (the "Merger Agreement"), pursuant to which Dynegy Inc. ("Dynegy") merged with and into Vistra Energy Corp. (the "Issuer") (the "Merger").

F2 · price: Pursuant to the Merger Agreement, each outstanding share of Dynegy common stock held immediately prior to the effective time of the Merger (other than certain excluded shares) converted into 0.652 shares of Issuer common stock.

SEC source: 0001209191-18-024617 · doc4.xml · derivative · entry 1

Moore Stephanie Zapata · CIK 0001703634 · EVP and General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 192,890

Underlying: Common Stock · 192,890 shares

Expires 2027-04-09

F1 · derivative.exercise_date: The option vests 50% 4 years from the grant date with the remaining 50% vesting 5 years from the grant date.

SEC source: 0001209191-18-024616 · doc4.xml · derivative · entry 1

GRAZIANO SARA · CIK 0001620988 · SVP Corp. Dev. and Strategy

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 192,890

Underlying: Common Stock · 192,890 shares

Expires 2027-04-09

F1 · derivative.exercise_date: The option vests 50% 4 years from the grant date with the remaining 50% vesting 5 years from the grant date.

SEC source: 0001209191-18-024609 · doc4.xml · derivative · entry 1

HUDSON SCOTT A · CIK 0001728553 · SVP and President Retail

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 226,929

Underlying: Common Stock · 226,929 shares

Expires 2027-04-09

F1 · derivative.exercise_date: The option vests 50% 4 years from the grant date with the remaining 50% vesting 5 years from the grant date.

SEC source: 0001209191-18-024608 · doc4.xml · derivative · entry 1

MORGAN CURTIS A · CIK 0001262163 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,512,103

Underlying: Common Stock · 1,512,103 shares

Expires 2027-04-09

F1 · derivative.exercise_date: The option vests 50% 4 years from the grant date with the remaining 50% vesting 5 years from the grant date.

SEC source: 0001209191-18-024601 · doc4.xml · derivative · entry 1

HOLDEN J WILLIAM III · CIK 0001227591 · EVP and CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 302,572

Underlying: Common Stock · 302,572 shares

Expires 2027-04-09

F1 · derivative.exercise_date: The option vests 50% 4 years from the grant date with the remaining 50% vesting 5 years from the grant date.

SEC source: 0001209191-18-024602 · doc4.xml · derivative · entry 1

Kirby Carrie Lee · CIK 0001703633 · EVP and Chief Admin. Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 192,890

Underlying: Common Stock · 192,890 shares

Expires 2027-04-09

F1 · derivative.exercise_date: The option vests 50% 4 years from the grant date with the remaining 50% vesting 5 years from the grant date.

SEC source: 0001209191-18-024599 · doc4.xml · derivative · entry 1

BURKE JAMES A · CIK 0001268406 · EVP and COO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 567,322

Underlying: Common Stock · 567,322 shares

Expires 2027-04-09

F1 · derivative.exercise_date: The option vests 50% 4 years from the grant date with the remaining 50% vesting 5 years from the grant date.

SEC source: 0000950142-18-001124 · es1800672_4-vistra.xml · nonDerivative · entry 1

Oaktree Capital Group Holdings GP, LLC · CIK 0001403525 · Director · Not applicable

OAKTREE CAPITAL MANAGEMENT LP · CIK 0000949509 · Director · Not applicable

Oaktree Holdings, Inc. · CIK 0001403382 · Director · Not applicable

Oaktree Capital Group, LLC · CIK 0001403528 · Director · Not applicable

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 51,530,530

F1 · price: This Form 4 is being filed by Opps VIIb TCEH Holdings, LLC ("Opps Holdings") with respect to 14,765,903 shares of the Issuer's Common Stock, par value $0.01 (the "Issuer's Common Stock"), and, with respect to 36,764,627 shares of the Issuer's Common Stock (i) Oaktree Capital Management, L.P. ("Management") as the duly appointed investment manager of certain funds and accounts (the "Managed Entities") that directly own the 36,764,627 shares of the Issuer's Common Stock; (ii) Oaktree Holdings, Inc. ("Holdings, Inc.") as the general partner of Management; (iii) Oaktree Capital Group, LLC ("OCG") as the sole shareholder of Holdings, Inc.; and (iv) Oaktree Capital Group Holdings GP, LLC ("OCGH GP", and together with Opps Holdings, Management, Holdings, Inc. and OCG, the "Reporting Persons" and each a "Reporting Person") as the duly elected manager of OCG. (Cont'd on FN 2)

F2 · price: (Cont'd from FN 1) This Form 4 reflects (a) 834,438 additional shares of the Issuer's Common Stock acquired by the Reporting Persons on March 31, 2017, prior to the registration of the Common Stock under the Securities Exchange Act of 1934, as amended, and (b) a decrease in beneficial ownership of 59,964 shares of the Issuer's Common Stock, as to which shares the Reporting Persons disclaimed beneficial ownership except to the extent of their pecuniary interest therein, between August 1, 2017 and March 1, 2018 due to the termination of the Reporting Persons' management of certain managed accounts.

F3 · price: This Form 4 is being filed in connection with the consummation on April 9, 2018 (the "Closing Date"), of the transactions contemplated by that certain Agreement and Plan of Merger, dated October 29, 2017 (the "Merger Agreement"), by and between the Issuer, and Dynegy Inc., a Delaware corporation ("Dynegy"). Pursuant to the Merger Agreement, on the Closing Date, Dynegy merged with and into the Issuer, with the Issuer continuing as the surviving corporation (the "Merger"). The combined company will operate under the name "Vistra Energy Corp." and will continue to be a Delaware corporation. (Cont'd on FN 4)

F4 · price: (Cont'd from FN 3) On the Closing Date, each issued and outstanding share of Dynegy Common Stock, other than shares owned by the Issuer or its wholly owned subsidiaries, held in treasury by Dynegy or held by a wholly owned subsidiary of Dynegy, was automatically converted into the right to receive 0.652 shares of the Issuer's Common Stock (the "Conversion"). Pursuant to the Merger Agreement, the Reporting Persons received 3,091,718 shares of the Issuer's Common Stock upon the Conversion.

F1 · balance_after: This Form 4 is being filed by Opps VIIb TCEH Holdings, LLC ("Opps Holdings") with respect to 14,765,903 shares of the Issuer's Common Stock, par value $0.01 (the "Issuer's Common Stock"), and, with respect to 36,764,627 shares of the Issuer's Common Stock (i) Oaktree Capital Management, L.P. ("Management") as the duly appointed investment manager of certain funds and accounts (the "Managed Entities") that directly own the 36,764,627 shares of the Issuer's Common Stock; (ii) Oaktree Holdings, Inc. ("Holdings, Inc.") as the general partner of Management; (iii) Oaktree Capital Group, LLC ("OCG") as the sole shareholder of Holdings, Inc.; and (iv) Oaktree Capital Group Holdings GP, LLC ("OCGH GP", and together with Opps Holdings, Management, Holdings, Inc. and OCG, the "Reporting Persons" and each a "Reporting Person") as the duly elected manager of OCG. (Cont'd on FN 2)

F2 · balance_after: (Cont'd from FN 1) This Form 4 reflects (a) 834,438 additional shares of the Issuer's Common Stock acquired by the Reporting Persons on March 31, 2017, prior to the registration of the Common Stock under the Securities Exchange Act of 1934, as amended, and (b) a decrease in beneficial ownership of 59,964 shares of the Issuer's Common Stock, as to which shares the Reporting Persons disclaimed beneficial ownership except to the extent of their pecuniary interest therein, between August 1, 2017 and March 1, 2018 due to the termination of the Reporting Persons' management of certain managed accounts.

F3 · balance_after: This Form 4 is being filed in connection with the consummation on April 9, 2018 (the "Closing Date"), of the transactions contemplated by that certain Agreement and Plan of Merger, dated October 29, 2017 (the "Merger Agreement"), by and between the Issuer, and Dynegy Inc., a Delaware corporation ("Dynegy"). Pursuant to the Merger Agreement, on the Closing Date, Dynegy merged with and into the Issuer, with the Issuer continuing as the surviving corporation (the "Merger"). The combined company will operate under the name "Vistra Energy Corp." and will continue to be a Delaware corporation. (Cont'd on FN 4)

F4 · balance_after: (Cont'd from FN 3) On the Closing Date, each issued and outstanding share of Dynegy Common Stock, other than shares owned by the Issuer or its wholly owned subsidiaries, held in treasury by Dynegy or held by a wholly owned subsidiary of Dynegy, was automatically converted into the right to receive 0.652 shares of the Issuer's Common Stock (the "Conversion"). Pursuant to the Merger Agreement, the Reporting Persons received 3,091,718 shares of the Issuer's Common Stock upon the Conversion.

F5 · balance_after: The acquisition by the Reporting Persons of the Issuer's Common Stock pursuant to the Conversion is exempt from Section 16(b) pursuant to Section 16(b)-3(d).

F6 · balance_after: Following the Closing Date of the Merger, the Reporting Persons beneficially owned less than 10% of the Issuer's Common Stock outstanding, and on April 24, 2018, Jennifer Box resigned from the board of directors of the Issuer. As a result, the Reporting Persons have ceased to have a reporting obligation under Section 16.

F1 · ownership.nature: This Form 4 is being filed by Opps VIIb TCEH Holdings, LLC ("Opps Holdings") with respect to 14,765,903 shares of the Issuer's Common Stock, par value $0.01 (the "Issuer's Common Stock"), and, with respect to 36,764,627 shares of the Issuer's Common Stock (i) Oaktree Capital Management, L.P. ("Management") as the duly appointed investment manager of certain funds and accounts (the "Managed Entities") that directly own the 36,764,627 shares of the Issuer's Common Stock; (ii) Oaktree Holdings, Inc. ("Holdings, Inc.") as the general partner of Management; (iii) Oaktree Capital Group, LLC ("OCG") as the sole shareholder of Holdings, Inc.; and (iv) Oaktree Capital Group Holdings GP, LLC ("OCGH GP", and together with Opps Holdings, Management, Holdings, Inc. and OCG, the "Reporting Persons" and each a "Reporting Person") as the duly elected manager of OCG. (Cont'd on FN 2)

F2 · ownership.nature: (Cont'd from FN 1) This Form 4 reflects (a) 834,438 additional shares of the Issuer's Common Stock acquired by the Reporting Persons on March 31, 2017, prior to the registration of the Common Stock under the Securities Exchange Act of 1934, as amended, and (b) a decrease in beneficial ownership of 59,964 shares of the Issuer's Common Stock, as to which shares the Reporting Persons disclaimed beneficial ownership except to the extent of their pecuniary interest therein, between August 1, 2017 and March 1, 2018 due to the termination of the Reporting Persons' management of certain managed accounts.

F3 · ownership.nature: This Form 4 is being filed in connection with the consummation on April 9, 2018 (the "Closing Date"), of the transactions contemplated by that certain Agreement and Plan of Merger, dated October 29, 2017 (the "Merger Agreement"), by and between the Issuer, and Dynegy Inc., a Delaware corporation ("Dynegy"). Pursuant to the Merger Agreement, on the Closing Date, Dynegy merged with and into the Issuer, with the Issuer continuing as the surviving corporation (the "Merger"). The combined company will operate under the name "Vistra Energy Corp." and will continue to be a Delaware corporation. (Cont'd on FN 4)

F4 · ownership.nature: (Cont'd from FN 3) On the Closing Date, each issued and outstanding share of Dynegy Common Stock, other than shares owned by the Issuer or its wholly owned subsidiaries, held in treasury by Dynegy or held by a wholly owned subsidiary of Dynegy, was automatically converted into the right to receive 0.652 shares of the Issuer's Common Stock (the "Conversion"). Pursuant to the Merger Agreement, the Reporting Persons received 3,091,718 shares of the Issuer's Common Stock upon the Conversion.

F5 · ownership.nature: The acquisition by the Reporting Persons of the Issuer's Common Stock pursuant to the Conversion is exempt from Section 16(b) pursuant to Section 16(b)-3(d).

F6 · ownership.nature: Following the Closing Date of the Merger, the Reporting Persons beneficially owned less than 10% of the Issuer's Common Stock outstanding, and on April 24, 2018, Jennifer Box resigned from the board of directors of the Issuer. As a result, the Reporting Persons have ceased to have a reporting obligation under Section 16.

F7 · ownership.nature: The members of OCGH GP are Howard S. Marks, Bruce A. Karsh, Jay S. Wintrob, John B. Frank and Sheldon M. Stone, who, by virtue of their membership interests in OCGH GP, may be deemed to share voting and dispositive power with respect to the shares of Issuer's Common Stock held by the Managed Entities. Each of the general partners, managing members, directors and managers described above disclaims beneficial ownership of any shares of common stock beneficially or of record owned by the Reporting Persons, except to the extent of any pecuniary interest therein.

SEC source: 0001209191-18-048765 · doc4.xml · nonDerivative · entry 1

BURKE JAMES A · CIK 0001268406 · EVP and COO

10b5-1 filing: Not disclosed

Ownership: Indirect · By the Marti E. Burke 2012 Irrevocable Trust, dated 10/16/2012

Disclosed balance after: 156,796

F1 · kind: The reporting person is the trustee of the Marti E. Burke 2012 Irrevocable Trust, dated October 16, 2012 (the "Trust") of which the reporting person's wife is the beneficiary. The Trust owned shares of Dynegy Inc. ("Dynegy") prior to Dynegy's merger into Vistra Energy Corp. (the "Issuer") on April 9, 2018 (the "Effective Date") in a transaction exempt from Section 16(b) of the Exchange Act. The reporting person was only recently made aware that the Trust owned Dynegy shares prior to the Effective Date that converted to Issuer shares on the Effective Date.

F2 · price: Pursuant to the Agreement and Plan of Merger, dated October 29, 2017, Dynegy would merge with and into the Issuer, and on the Effective Date, each outstanding common share of Dynegy would convert into 0.652 shares of the Issuer.

SEC source: 0001209191-19-010049 · doc4a.xml · derivative · entry 1

BURKE JAMES A · CIK 0001268406 · EVP and COO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,074,685

Underlying: Common Stock · 567,000 shares

Expires 2027-04-09

F1 · derivative.exercise_date: The option vests 50% 4 years from the grant date with the remaining 50% vesting 5 years from the grant date.

F2 · balance_after: This amended Form 4 corrects an inadvertently miscalculated number of securities beneficially owned in column 9 of the Form 4 filed April 11, 2018.

SEC source: 0001209191-18-023407 · doc4.xml · nonDerivative · entry 1

HELM SCOTT B · CIK 0001711936 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 16,902

F1 · kind: The purchase reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan established by the reporting person on November 10, 2017.

SEC source: 0001209191-18-021849 · doc4.xml · nonDerivative · entry 1

HELM SCOTT B · CIK 0001711936 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 16,702

F1 · kind: The purchase reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan established by the reporting person on November 10, 2017.

SEC source: 0001209191-18-021206 · doc4.xml · nonDerivative · entry 1

HELM SCOTT B · CIK 0001711936 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 16,502

F1 · kind: The purchase reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan established by the reporting person on November 10, 2017.

SEC source: 0001104659-18-018397 · a4.xml · nonDerivative · entry 1

Apollo Management Holdings GP, LLC · CIK 0001449433 · 10% owner

Apollo Management Holdings, L.P. · CIK 0001449434 · 10% owner

Apollo Capital Management GP, LLC · CIK 0001456419 · 10% owner

Apollo Capital Management, L.P. · CIK 0001456421 · 10% owner

Apollo Management GP, LLC · CIK 0001413410 · 10% owner

Apollo Management, L.P. · CIK 0001398053 · 10% owner

APH Holdings, L.P. · CIK 0001648671 · 10% owner

Apollo Principal Holdings III, L.P. · CIK 0001566433 · 10% owner

Apollo Principal Holdings III GP Ltd · CIK 0001566491 · 10% owner

AIF VII Management, LLC · CIK 0001475358 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 40,131,762

F1 · shares: See Exhibit 99.1

F2 · ownership.nature: See Exhibit 99.1

SEC source: 0001209191-18-019486 · doc4.xml · nonDerivative · entry 1

HELM SCOTT B · CIK 0001711936 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 16,302

F1 · kind: The purchase reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan established by the reporting person on November 10, 2017.

SEC source: 0000950142-18-000647 · es1800425_4-vistra.xml · nonDerivative · entry 1

Oaktree Capital Group Holdings GP, LLC · CIK 0001403525 · Director · 10% owner

OAKTREE CAPITAL MANAGEMENT LP · CIK 0000949509 · 10% owner

Oaktree Holdings, Inc. · CIK 0001403382 · 10% owner

Oaktree Capital Group, LLC · CIK 0001403528 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 47,664,300

F1 · ownership.nature: This Form 4 is being filed by Opps VIIb TCEH Holdings, LLC ("Opps Holdings") with respect to 14,765,903 shares of the Common Stock and, with respect to 32,878,397 shares of the Common Stock (i) Oaktree Capital Management, L.P. ("Management") as the duly appointed investment manager of certain funds and accounts (the "Managed Entities") that directly own the 32,878,397 shares of the Common Stock; (ii) Oaktree Holdings, Inc. ("Holdings, Inc.") as the general partner of Management; (iii) Oaktree Capital Group, LLC ("OCG") as the sole shareholder of Holdings, Inc.; and (iv) Oaktree Capital Group Holdings GP, LLC ("OCGH GP", and together with Opps Holdings, Management, Holdings, Inc. and OCG, the "Reporting Persons" and each a "Reporting Person") as the duly elected manager of OCG.

F2 · ownership.nature: The members of OCGH GP are Howard S. Marks, Bruce A. Karsh, Jay S. Wintrob, John B. Frank and Sheldon M. Stone, who, by virtue of their membership interests in OCGH GP, may be deemed to share voting and dispositive power with respect to the shares of Common Stock held by the Managed Entities. Each of the general partners, managing members, directors and managers described above disclaims beneficial ownership of any shares of common stock beneficially or of record owned by the Reporting Persons, except to the extent of any pecuniary interest therein.

SEC source: 0001209191-18-017599 · doc4.xml · nonDerivative · entry 1

HELM SCOTT B · CIK 0001711936 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 16,102

F1 · kind: The purchase reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan established by the reporting person on November 10, 2017.

SEC source: 0001209191-18-005030 · doc4.xml · nonDerivative · entry 1

HELM SCOTT B · CIK 0001711936 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,902

F1 · kind: The purchase reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan established by the reporting person on November 10, 2017.

SEC source: 0001209191-18-003775 · doc4.xml · nonDerivative · entry 1

HELM SCOTT B · CIK 0001711936 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,702

F1 · kind: The purchase reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan established by the reporting person on November 10, 2017.

SEC source: 0001209191-18-003080 · doc4.xml · nonDerivative · entry 1

HELM SCOTT B · CIK 0001711936 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,502

F1 · kind: The purchase reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan established by the reporting person on November 10, 2017.

SEC source: 0001209191-18-000436 · doc4.xml · nonDerivative · entry 1

HELM SCOTT B · CIK 0001711936 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,302

F1 · kind: The purchase reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan established by the reporting person on November 10, 2017.