SMC

SEC source: 0002024218-24-000037 · wk-form4_1732316473.xml · nonDerivative · entry 2

Deneke J Heath · CIK 0001555671 · Chairman, President and CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 283,006

F1 · kind: These Common Stocks were sold in compliance with a qualified selling plan adopted by the reporting person pursuant to Rule 10b5-1 under the Securities Exchange Act of 1934, as amended.

SEC source: 0002024218-24-000037 · wk-form4_1732316473.xml · nonDerivative · entry 1

Deneke J Heath · CIK 0001555671 · Chairman, President and CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 284,006

F1 · kind: These Common Stocks were sold in compliance with a qualified selling plan adopted by the reporting person pursuant to Rule 10b5-1 under the Securities Exchange Act of 1934, as amended.

SEC source: 0002024218-24-000036 · wk-form4_1732057561.xml · nonDerivative · entry 3

Deneke J Heath · CIK 0001555671 · Chairman, President and CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 285,006

F1 · kind: These Common Stocks were sold in compliance with a qualified selling plan adopted by the reporting person pursuant to Rule 10b5-1 under the Securities Exchange Act of 1934, as amended.

SEC source: 0002024218-24-000036 · wk-form4_1732057561.xml · nonDerivative · entry 2

Deneke J Heath · CIK 0001555671 · Chairman, President and CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 286,006

F1 · kind: These Common Stocks were sold in compliance with a qualified selling plan adopted by the reporting person pursuant to Rule 10b5-1 under the Securities Exchange Act of 1934, as amended.

SEC source: 0002024218-24-000036 · wk-form4_1732057561.xml · nonDerivative · entry 1

Deneke J Heath · CIK 0001555671 · Chairman, President and CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 287,006

F1 · kind: These Common Stocks were sold in compliance with a qualified selling plan adopted by the reporting person pursuant to Rule 10b5-1 under the Securities Exchange Act of 1934, as amended.

SEC source: 0002024218-24-000019 · wk-form4_1722649295.xml · nonDerivative · entry 1

Oates Rommel M. · CIK 0001916097 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 19,375

F1 · kind: On August 1, 2024 (the "Effective Time"), in connection with the corporate reorganization of Summit Midstream Partners, LP (the "Partnership"), the Partnership converted from a master limited partnership to a C corporation (the "Corporate Reorganization") through the merger between the Partnership and Summit SMC NewCo, LLC ("Merger Sub"), a wholly-owned subsidiary of Summit Midstream Corporation (the "Corporation"), wherein Merger Sub merged with and into the Partnership (the "Merger"), with the Partnership surviving the Merger as a wholly-owned subsidiary of the Corporation.

F2 · kind: Pursuant to Rule 12g-3(e), the Corporation is the successor issuer to the Partnership for purposes of Section 16.

F3 · shares: Pursuant to the Merger, immediately prior to the Effective Time, all outstanding common units representing limited partner interests in the Partnership have been converted into the right to receive shares of Common Stock, par value $0.01 per share, of the Corporation.

F1 · price: On August 1, 2024 (the "Effective Time"), in connection with the corporate reorganization of Summit Midstream Partners, LP (the "Partnership"), the Partnership converted from a master limited partnership to a C corporation (the "Corporate Reorganization") through the merger between the Partnership and Summit SMC NewCo, LLC ("Merger Sub"), a wholly-owned subsidiary of Summit Midstream Corporation (the "Corporation"), wherein Merger Sub merged with and into the Partnership (the "Merger"), with the Partnership surviving the Merger as a wholly-owned subsidiary of the Corporation.

SEC source: 0002024218-24-000021 · wk-form4_1722649541.xml · nonDerivative · entry 1

CLEARY JAMES J · CIK 0001326432 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 30,209

F1 · kind: On August 1, 2024 (the "Effective Time"), in connection with the corporate reorganization of Summit Midstream Partners, LP (the "Partnership"), the Partnership converted from a master limited partnership to a C corporation (the "Corporate Reorganization") through the merger between the Partnership and Summit SMC NewCo, LLC ("Merger Sub"), a wholly-owned subsidiary of Summit Midstream Corporation (the "Corporation"), wherein Merger Sub merged with and into the Partnership (the "Merger"), with the Partnership surviving the Merger as a wholly-owned subsidiary of the Corporation.

F2 · kind: Pursuant to Rule 12g-3(e), the Corporation is the successor issuer to the Partnership for purposes of Section 16.

F3 · shares: Pursuant to the Merger, immediately prior to the Effective Time, all outstanding common units representing limited partner interests in the Partnership have been converted into the right to receive shares of Common Stock, par value $0.01 per share, of the Corporation.

F1 · price: On August 1, 2024 (the "Effective Time"), in connection with the corporate reorganization of Summit Midstream Partners, LP (the "Partnership"), the Partnership converted from a master limited partnership to a C corporation (the "Corporate Reorganization") through the merger between the Partnership and Summit SMC NewCo, LLC ("Merger Sub"), a wholly-owned subsidiary of Summit Midstream Corporation (the "Corporation"), wherein Merger Sub merged with and into the Partnership (the "Merger"), with the Partnership surviving the Merger as a wholly-owned subsidiary of the Corporation.

SEC source: 0002024218-24-000020 · wk-form4_1722649403.xml · nonDerivative · entry 1

Jacobe James Lee · CIK 0001774293 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 38,891

F1 · kind: On August 1, 2024 (the "Effective Time"), in connection with the corporate reorganization of Summit Midstream Partners, LP (the "Partnership"), the Partnership converted from a master limited partnership to a C corporation (the "Corporate Reorganization") through the merger between the Partnership and Summit SMC NewCo, LLC ("Merger Sub"), a wholly-owned subsidiary of Summit Midstream Corporation (the "Corporation"), wherein Merger Sub merged with and into the Partnership (the "Merger"), with the Partnership surviving the Merger as a wholly-owned subsidiary of the Corporation.

F2 · kind: Pursuant to Rule 12g-3(e), the Corporation is the successor issuer to the Partnership for purposes of Section 16.

F3 · shares: Pursuant to the Merger, immediately prior to the Effective Time, all outstanding common units representing limited partner interests in the Partnership have been converted into the right to receive shares of Common Stock, par value $0.01 per share, of the Corporation.

F1 · price: On August 1, 2024 (the "Effective Time"), in connection with the corporate reorganization of Summit Midstream Partners, LP (the "Partnership"), the Partnership converted from a master limited partnership to a C corporation (the "Corporate Reorganization") through the merger between the Partnership and Summit SMC NewCo, LLC ("Merger Sub"), a wholly-owned subsidiary of Summit Midstream Corporation (the "Corporation"), wherein Merger Sub merged with and into the Partnership (the "Merger"), with the Partnership surviving the Merger as a wholly-owned subsidiary of the Corporation.

SEC source: 0002024218-24-000018 · wk-form4_1722649201.xml · nonDerivative · entry 1

McNally Robert Joseph · CIK 0001351732 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 30,209

F1 · kind: On August 1, 2024 (the "Effective Time"), in connection with the corporate reorganization of Summit Midstream Partners, LP (the "Partnership"), the Partnership converted from a master limited partnership to a C corporation (the "Corporate Reorganization") through the merger between the Partnership and Summit SMC NewCo, LLC ("Merger Sub"), a wholly-owned subsidiary of Summit Midstream Corporation (the "Corporation"), wherein Merger Sub merged with and into the Partnership (the "Merger"), with the Partnership surviving the Merger as a wholly-owned subsidiary of the Corporation.

F2 · kind: Pursuant to Rule 12g-3(e), the Corporation is the successor issuer to the Partnership for purposes of Section 16.

F3 · shares: Pursuant to the Merger, immediately prior to the Effective Time, all outstanding common units representing limited partner interests in the Partnership have been converted into the right to receive shares of Common Stock, par value $0.01 per share, of the Corporation.

F1 · price: On August 1, 2024 (the "Effective Time"), in connection with the corporate reorganization of Summit Midstream Partners, LP (the "Partnership"), the Partnership converted from a master limited partnership to a C corporation (the "Corporate Reorganization") through the merger between the Partnership and Summit SMC NewCo, LLC ("Merger Sub"), a wholly-owned subsidiary of Summit Midstream Corporation (the "Corporation"), wherein Merger Sub merged with and into the Partnership (the "Merger"), with the Partnership surviving the Merger as a wholly-owned subsidiary of the Corporation.

SEC source: 0002024218-24-000017 · wk-form4_1722649095.xml · nonDerivative · entry 1

Woung-Chapman Marguerite · CIK 0001531214 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 30,209

F1 · kind: On August 1, 2024 (the "Effective Time"), in connection with the corporate reorganization of Summit Midstream Partners, LP (the "Partnership"), the Partnership converted from a master limited partnership to a C corporation (the "Corporate Reorganization") through the merger between the Partnership and Summit SMC NewCo, LLC ("Merger Sub"), a wholly-owned subsidiary of Summit Midstream Corporation (the "Corporation"), wherein Merger Sub merged with and into the Partnership (the "Merger"), with the Partnership surviving the Merger as a wholly-owned subsidiary of the Corporation.

F2 · kind: Pursuant to Rule 12g-3(e), the Corporation is the successor issuer to the Partnership for purposes of Section 16.

F3 · shares: Pursuant to the Merger, immediately prior to the Effective Time, all outstanding common units representing limited partner interests in the Partnership have been converted into the right to receive shares of Common Stock, par value $0.01 per share, of the Corporation.

F1 · price: On August 1, 2024 (the "Effective Time"), in connection with the corporate reorganization of Summit Midstream Partners, LP (the "Partnership"), the Partnership converted from a master limited partnership to a C corporation (the "Corporate Reorganization") through the merger between the Partnership and Summit SMC NewCo, LLC ("Merger Sub"), a wholly-owned subsidiary of Summit Midstream Corporation (the "Corporation"), wherein Merger Sub merged with and into the Partnership (the "Merger"), with the Partnership surviving the Merger as a wholly-owned subsidiary of the Corporation.

SEC source: 0002024218-24-000016 · wk-form4_1722648995.xml · nonDerivative · entry 1

PETERS JERRY L · CIK 0001237636 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 30,239

F1 · kind: On August 1, 2024 (the "Effective Time"), in connection with the corporate reorganization of Summit Midstream Partners, LP (the "Partnership"), the Partnership converted from a master limited partnership to a C corporation (the "Corporate Reorganization") through the merger between the Partnership and Summit SMC NewCo, LLC ("Merger Sub"), a wholly-owned subsidiary of Summit Midstream Corporation (the "Corporation"), wherein Merger Sub merged with and into the Partnership (the "Merger"), with the Partnership surviving the Merger as a wholly-owned subsidiary of the Corporation.

F2 · kind: Pursuant to Rule 12g-3(e), the Corporation is the successor issuer to the Partnership for purposes of Section 16.

F3 · shares: Pursuant to the Merger, immediately prior to the Effective Time, all outstanding common units representing limited partner interests in the Partnership have been converted into the right to receive shares of Common Stock, par value $0.01 per share, of the Corporation.

F1 · price: On August 1, 2024 (the "Effective Time"), in connection with the corporate reorganization of Summit Midstream Partners, LP (the "Partnership"), the Partnership converted from a master limited partnership to a C corporation (the "Corporate Reorganization") through the merger between the Partnership and Summit SMC NewCo, LLC ("Merger Sub"), a wholly-owned subsidiary of Summit Midstream Corporation (the "Corporation"), wherein Merger Sub merged with and into the Partnership (the "Merger"), with the Partnership surviving the Merger as a wholly-owned subsidiary of the Corporation.

SEC source: 0002024218-24-000015 · wk-form4_1722648859.xml · derivative · entry 2

Mault William J. · CIK 0001911803 · Executive VP and CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 97,929

Underlying: Common Stock · 97,929 shares

Expires not disclosed

F4 · derivative.exercise_price: Pursuant to the Merger, each outstanding phantom unit award granted under the Summit Midstream Partners, LP 2012 Long-Term Incentive Plan, as amended and restated, or the Summit Midstream Partners, LP 2022 Long-Term Incentive Plan, as amended (the "Partnership Phantom Unit Awards"), have been converted into an award of restricted stock units relating to a number of shares of common stock of the Corporation (the "Corporation RSUs") equal to the number of Common Units subject to such Partnership Phantom Unit Award, as of immediately prior to the Effective Time. The Corporation RSUs will be subject to substantially the same terms and conditions as were applicable to the converted Partnership Phantom Unit Awards, including vesting and payment timing provisions, as applicable.

F1 · kind: On August 1, 2024 (the "Effective Time"), in connection with the corporate reorganization of Summit Midstream Partners, LP (the "Partnership"), the Partnership converted from a master limited partnership to a C corporation (the "Corporate Reorganization") through the merger between the Partnership and Summit SMC NewCo, LLC ("Merger Sub"), a wholly-owned subsidiary of Summit Midstream Corporation (the "Corporation"), wherein Merger Sub merged with and into the Partnership (the "Merger"), with the Partnership surviving the Merger as a wholly-owned subsidiary of the Corporation.

F2 · kind: Pursuant to Rule 12g-3(e), the Corporation is the successor issuer to the Partnership for purposes of Section 16.

F4 · price: Pursuant to the Merger, each outstanding phantom unit award granted under the Summit Midstream Partners, LP 2012 Long-Term Incentive Plan, as amended and restated, or the Summit Midstream Partners, LP 2022 Long-Term Incentive Plan, as amended (the "Partnership Phantom Unit Awards"), have been converted into an award of restricted stock units relating to a number of shares of common stock of the Corporation (the "Corporation RSUs") equal to the number of Common Units subject to such Partnership Phantom Unit Award, as of immediately prior to the Effective Time. The Corporation RSUs will be subject to substantially the same terms and conditions as were applicable to the converted Partnership Phantom Unit Awards, including vesting and payment timing provisions, as applicable.

F4 · derivative.exercise_date: Pursuant to the Merger, each outstanding phantom unit award granted under the Summit Midstream Partners, LP 2012 Long-Term Incentive Plan, as amended and restated, or the Summit Midstream Partners, LP 2022 Long-Term Incentive Plan, as amended (the "Partnership Phantom Unit Awards"), have been converted into an award of restricted stock units relating to a number of shares of common stock of the Corporation (the "Corporation RSUs") equal to the number of Common Units subject to such Partnership Phantom Unit Award, as of immediately prior to the Effective Time. The Corporation RSUs will be subject to substantially the same terms and conditions as were applicable to the converted Partnership Phantom Unit Awards, including vesting and payment timing provisions, as applicable.

F4 · derivative.expiration_date: Pursuant to the Merger, each outstanding phantom unit award granted under the Summit Midstream Partners, LP 2012 Long-Term Incentive Plan, as amended and restated, or the Summit Midstream Partners, LP 2022 Long-Term Incentive Plan, as amended (the "Partnership Phantom Unit Awards"), have been converted into an award of restricted stock units relating to a number of shares of common stock of the Corporation (the "Corporation RSUs") equal to the number of Common Units subject to such Partnership Phantom Unit Award, as of immediately prior to the Effective Time. The Corporation RSUs will be subject to substantially the same terms and conditions as were applicable to the converted Partnership Phantom Unit Awards, including vesting and payment timing provisions, as applicable.

F3 · derivative.underlying_shares: Pursuant to the Merger, immediately prior to the Effective Time, all outstanding common units representing limited partner interests in the Partnership (the "Common Units") have been converted into the right to receive shares of Common Stock, par value $0.01 per share, of the Corporation.

SEC source: 0002024218-24-000015 · wk-form4_1722648859.xml · nonDerivative · entry 1

Mault William J. · CIK 0001911803 · Executive VP and CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 40,282

F1 · kind: On August 1, 2024 (the "Effective Time"), in connection with the corporate reorganization of Summit Midstream Partners, LP (the "Partnership"), the Partnership converted from a master limited partnership to a C corporation (the "Corporate Reorganization") through the merger between the Partnership and Summit SMC NewCo, LLC ("Merger Sub"), a wholly-owned subsidiary of Summit Midstream Corporation (the "Corporation"), wherein Merger Sub merged with and into the Partnership (the "Merger"), with the Partnership surviving the Merger as a wholly-owned subsidiary of the Corporation.

F2 · kind: Pursuant to Rule 12g-3(e), the Corporation is the successor issuer to the Partnership for purposes of Section 16.

F3 · shares: Pursuant to the Merger, immediately prior to the Effective Time, all outstanding common units representing limited partner interests in the Partnership (the "Common Units") have been converted into the right to receive shares of Common Stock, par value $0.01 per share, of the Corporation.

F1 · price: On August 1, 2024 (the "Effective Time"), in connection with the corporate reorganization of Summit Midstream Partners, LP (the "Partnership"), the Partnership converted from a master limited partnership to a C corporation (the "Corporate Reorganization") through the merger between the Partnership and Summit SMC NewCo, LLC ("Merger Sub"), a wholly-owned subsidiary of Summit Midstream Corporation (the "Corporation"), wherein Merger Sub merged with and into the Partnership (the "Merger"), with the Partnership surviving the Merger as a wholly-owned subsidiary of the Corporation.

SEC source: 0002024218-24-000014 · wk-form4_1722648754.xml · derivative · entry 2

Deneke J Heath · CIK 0001555671 · Chairman, President and CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 327,759

Underlying: Common Stock · 327,759 shares

Expires not disclosed

F4 · derivative.exercise_price: Pursuant to the Merger, each outstanding phantom unit award granted under the Summit Midstream Partners, LP 2012 Long-Term Incentive Plan, as amended and restated, or the Summit Midstream Partners, LP 2022 Long-Term Incentive Plan, as amended (the "Partnership Phantom Unit Awards"), have been converted into an award of restricted stock units relating to a number of shares of common stock of the Corporation (the "Corporation RSUs") equal to the number of Common Units subject to such Partnership Phantom Unit Award, as of immediately prior to the Effective Time. The Corporation RSUs will be subject to substantially the same terms and conditions as were applicable to the converted Partnership Phantom Unit Awards, including vesting and payment timing provisions, as applicable.

F1 · kind: On August 1, 2024 (the "Effective Time"), in connection with the corporate reorganization of Summit Midstream Partners, LP (the "Partnership"), the Partnership converted from a master limited partnership to a C corporation (the "Corporate Reorganization") through the merger between the Partnership and Summit SMC NewCo, LLC ("Merger Sub"), a wholly-owned subsidiary of Summit Midstream Corporation (the "Corporation"), wherein Merger Sub merged with and into the Partnership (the "Merger"), with the Partnership surviving the Merger as a wholly-owned subsidiary of the Corporation.

F2 · kind: Pursuant to Rule 12g-3(e), the Corporation is the successor issuer to the Partnership for purposes of Section 16.

F4 · price: Pursuant to the Merger, each outstanding phantom unit award granted under the Summit Midstream Partners, LP 2012 Long-Term Incentive Plan, as amended and restated, or the Summit Midstream Partners, LP 2022 Long-Term Incentive Plan, as amended (the "Partnership Phantom Unit Awards"), have been converted into an award of restricted stock units relating to a number of shares of common stock of the Corporation (the "Corporation RSUs") equal to the number of Common Units subject to such Partnership Phantom Unit Award, as of immediately prior to the Effective Time. The Corporation RSUs will be subject to substantially the same terms and conditions as were applicable to the converted Partnership Phantom Unit Awards, including vesting and payment timing provisions, as applicable.

F4 · derivative.exercise_date: Pursuant to the Merger, each outstanding phantom unit award granted under the Summit Midstream Partners, LP 2012 Long-Term Incentive Plan, as amended and restated, or the Summit Midstream Partners, LP 2022 Long-Term Incentive Plan, as amended (the "Partnership Phantom Unit Awards"), have been converted into an award of restricted stock units relating to a number of shares of common stock of the Corporation (the "Corporation RSUs") equal to the number of Common Units subject to such Partnership Phantom Unit Award, as of immediately prior to the Effective Time. The Corporation RSUs will be subject to substantially the same terms and conditions as were applicable to the converted Partnership Phantom Unit Awards, including vesting and payment timing provisions, as applicable.

F4 · derivative.expiration_date: Pursuant to the Merger, each outstanding phantom unit award granted under the Summit Midstream Partners, LP 2012 Long-Term Incentive Plan, as amended and restated, or the Summit Midstream Partners, LP 2022 Long-Term Incentive Plan, as amended (the "Partnership Phantom Unit Awards"), have been converted into an award of restricted stock units relating to a number of shares of common stock of the Corporation (the "Corporation RSUs") equal to the number of Common Units subject to such Partnership Phantom Unit Award, as of immediately prior to the Effective Time. The Corporation RSUs will be subject to substantially the same terms and conditions as were applicable to the converted Partnership Phantom Unit Awards, including vesting and payment timing provisions, as applicable.

F3 · derivative.underlying_shares: Pursuant to the Merger, immediately prior to the Effective Time, all outstanding common units representing limited partner interests in the Partnership (the "Common Units") have been converted into the right to receive shares of Common Stock, par value $0.01 per share, of the Corporation.

SEC source: 0002024218-24-000014 · wk-form4_1722648754.xml · nonDerivative · entry 1

Deneke J Heath · CIK 0001555671 · Chairman, President and CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 288,006

F1 · kind: On August 1, 2024 (the "Effective Time"), in connection with the corporate reorganization of Summit Midstream Partners, LP (the "Partnership"), the Partnership converted from a master limited partnership to a C corporation (the "Corporate Reorganization") through the merger between the Partnership and Summit SMC NewCo, LLC ("Merger Sub"), a wholly-owned subsidiary of Summit Midstream Corporation (the "Corporation"), wherein Merger Sub merged with and into the Partnership (the "Merger"), with the Partnership surviving the Merger as a wholly-owned subsidiary of the Corporation.

F2 · kind: Pursuant to Rule 12g-3(e), the Corporation is the successor issuer to the Partnership for purposes of Section 16.

F3 · shares: Pursuant to the Merger, immediately prior to the Effective Time, all outstanding common units representing limited partner interests in the Partnership (the "Common Units") have been converted into the right to receive shares of Common Stock, par value $0.01 per share, of the Corporation.

F1 · price: On August 1, 2024 (the "Effective Time"), in connection with the corporate reorganization of Summit Midstream Partners, LP (the "Partnership"), the Partnership converted from a master limited partnership to a C corporation (the "Corporate Reorganization") through the merger between the Partnership and Summit SMC NewCo, LLC ("Merger Sub"), a wholly-owned subsidiary of Summit Midstream Corporation (the "Corporation"), wherein Merger Sub merged with and into the Partnership (the "Merger"), with the Partnership surviving the Merger as a wholly-owned subsidiary of the Corporation.

SEC source: 0002024218-24-000013 · wk-form4_1722648645.xml · derivative · entry 2

Sicinski Matthew B. · CIK 0001911802 · Senior VP and CAO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 34,938

Underlying: Common Stock · 34,938 shares

Expires not disclosed

F4 · derivative.exercise_price: Pursuant to the Merger, each outstanding phantom unit award granted under the Summit Midstream Partners, LP 2012 Long-Term Incentive Plan, as amended and restated, or the Summit Midstream Partners, LP 2022 Long-Term Incentive Plan, as amended (the "Partnership Phantom Unit Awards"), have been converted into an award of restricted stock units relating to a number of shares of common stock of the Corporation (the "Corporation RSUs") equal to the number of Common Units subject to such Partnership Phantom Unit Award, as of immediately prior to the Effective Time. The Corporation RSUs will be subject to substantially the same terms and conditions as were applicable to the converted Partnership Phantom Unit Awards, including vesting and payment timing provisions, as applicable.

F1 · kind: On August 1, 2024 (the "Effective Time"), in connection with the corporate reorganization of Summit Midstream Partners, LP (the "Partnership"), the Partnership converted from a master limited partnership to a C corporation (the "Corporate Reorganization") through the merger between the Partnership and Summit SMC NewCo, LLC ("Merger Sub"), a wholly-owned subsidiary of Summit Midstream Corporation (the "Corporation"), wherein Merger Sub merged with and into the Partnership (the "Merger"), with the Partnership surviving the Merger as a wholly-owned subsidiary of the Corporation.

F2 · kind: Pursuant to Rule 12g-3(e), the Corporation is the successor issuer to the Partnership for purposes of Section 16.

F4 · price: Pursuant to the Merger, each outstanding phantom unit award granted under the Summit Midstream Partners, LP 2012 Long-Term Incentive Plan, as amended and restated, or the Summit Midstream Partners, LP 2022 Long-Term Incentive Plan, as amended (the "Partnership Phantom Unit Awards"), have been converted into an award of restricted stock units relating to a number of shares of common stock of the Corporation (the "Corporation RSUs") equal to the number of Common Units subject to such Partnership Phantom Unit Award, as of immediately prior to the Effective Time. The Corporation RSUs will be subject to substantially the same terms and conditions as were applicable to the converted Partnership Phantom Unit Awards, including vesting and payment timing provisions, as applicable.

F4 · derivative.exercise_date: Pursuant to the Merger, each outstanding phantom unit award granted under the Summit Midstream Partners, LP 2012 Long-Term Incentive Plan, as amended and restated, or the Summit Midstream Partners, LP 2022 Long-Term Incentive Plan, as amended (the "Partnership Phantom Unit Awards"), have been converted into an award of restricted stock units relating to a number of shares of common stock of the Corporation (the "Corporation RSUs") equal to the number of Common Units subject to such Partnership Phantom Unit Award, as of immediately prior to the Effective Time. The Corporation RSUs will be subject to substantially the same terms and conditions as were applicable to the converted Partnership Phantom Unit Awards, including vesting and payment timing provisions, as applicable.

F4 · derivative.expiration_date: Pursuant to the Merger, each outstanding phantom unit award granted under the Summit Midstream Partners, LP 2012 Long-Term Incentive Plan, as amended and restated, or the Summit Midstream Partners, LP 2022 Long-Term Incentive Plan, as amended (the "Partnership Phantom Unit Awards"), have been converted into an award of restricted stock units relating to a number of shares of common stock of the Corporation (the "Corporation RSUs") equal to the number of Common Units subject to such Partnership Phantom Unit Award, as of immediately prior to the Effective Time. The Corporation RSUs will be subject to substantially the same terms and conditions as were applicable to the converted Partnership Phantom Unit Awards, including vesting and payment timing provisions, as applicable.

F3 · derivative.underlying_shares: Pursuant to the Merger, immediately prior to the Effective Time, all outstanding common units representing limited partner interests in the Partnership (the "Common Units") have been converted into the right to receive shares of Common Stock, par value $0.01 per share, of the Corporation.

SEC source: 0002024218-24-000013 · wk-form4_1722648645.xml · nonDerivative · entry 1

Sicinski Matthew B. · CIK 0001911802 · Senior VP and CAO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,658

F1 · kind: On August 1, 2024 (the "Effective Time"), in connection with the corporate reorganization of Summit Midstream Partners, LP (the "Partnership"), the Partnership converted from a master limited partnership to a C corporation (the "Corporate Reorganization") through the merger between the Partnership and Summit SMC NewCo, LLC ("Merger Sub"), a wholly-owned subsidiary of Summit Midstream Corporation (the "Corporation"), wherein Merger Sub merged with and into the Partnership (the "Merger"), with the Partnership surviving the Merger as a wholly-owned subsidiary of the Corporation.

F2 · kind: Pursuant to Rule 12g-3(e), the Corporation is the successor issuer to the Partnership for purposes of Section 16.

F3 · shares: Pursuant to the Merger, immediately prior to the Effective Time, all outstanding common units representing limited partner interests in the Partnership (the "Common Units") have been converted into the right to receive shares of Common Stock, par value $0.01 per share, of the Corporation.

F1 · price: On August 1, 2024 (the "Effective Time"), in connection with the corporate reorganization of Summit Midstream Partners, LP (the "Partnership"), the Partnership converted from a master limited partnership to a C corporation (the "Corporate Reorganization") through the merger between the Partnership and Summit SMC NewCo, LLC ("Merger Sub"), a wholly-owned subsidiary of Summit Midstream Corporation (the "Corporation"), wherein Merger Sub merged with and into the Partnership (the "Merger"), with the Partnership surviving the Merger as a wholly-owned subsidiary of the Corporation.

SEC source: 0002024218-24-000012 · wk-form4_1722648438.xml · derivative · entry 2

Johnston James David · CIK 0001823482 · Executive VP, GC, CCO and Secy

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 102,745

Underlying: Common Stock · 102,745 shares

Expires not disclosed

F4 · derivative.exercise_price: Pursuant to the Merger, each outstanding phantom unit award granted under the Summit Midstream Partners, LP 2012 Long-Term Incentive Plan, as amended and restated, or the Summit Midstream Partners, LP 2022 Long-Term Incentive Plan, as amended (the "Partnership Phantom Unit Awards"), have been converted into an award of restricted stock units relating to a number of shares of common stock of the Corporation (the "Corporation RSUs") equal to the number of Common Units subject to such Partnership Phantom Unit Award, as of immediately prior to the Effective Time. The Corporation RSUs will be subject to substantially the same terms and conditions as were applicable to the converted Partnership Phantom Unit Awards, including vesting and payment timing provisions, as applicable.

F1 · kind: On August 1, 2024 (the "Effective Time"), in connection with the corporate reorganization of Summit Midstream Partners, LP (the "Partnership"), the Partnership converted from a master limited partnership to a C corporation (the "Corporate Reorganization") through the merger between the Partnership and Summit SMC NewCo, LLC ("Merger Sub"), a wholly-owned subsidiary of Summit Midstream Corporation (the "Corporation"), wherein Merger Sub merged with and into the Partnership (the "Merger"), with the Partnership surviving the Merger as a wholly-owned subsidiary of the Corporation.

F2 · kind: Pursuant to Rule 12g-3(e), the Corporation is the successor issuer to the Partnership for purposes of Section 16.

F4 · price: Pursuant to the Merger, each outstanding phantom unit award granted under the Summit Midstream Partners, LP 2012 Long-Term Incentive Plan, as amended and restated, or the Summit Midstream Partners, LP 2022 Long-Term Incentive Plan, as amended (the "Partnership Phantom Unit Awards"), have been converted into an award of restricted stock units relating to a number of shares of common stock of the Corporation (the "Corporation RSUs") equal to the number of Common Units subject to such Partnership Phantom Unit Award, as of immediately prior to the Effective Time. The Corporation RSUs will be subject to substantially the same terms and conditions as were applicable to the converted Partnership Phantom Unit Awards, including vesting and payment timing provisions, as applicable.

F4 · derivative.exercise_date: Pursuant to the Merger, each outstanding phantom unit award granted under the Summit Midstream Partners, LP 2012 Long-Term Incentive Plan, as amended and restated, or the Summit Midstream Partners, LP 2022 Long-Term Incentive Plan, as amended (the "Partnership Phantom Unit Awards"), have been converted into an award of restricted stock units relating to a number of shares of common stock of the Corporation (the "Corporation RSUs") equal to the number of Common Units subject to such Partnership Phantom Unit Award, as of immediately prior to the Effective Time. The Corporation RSUs will be subject to substantially the same terms and conditions as were applicable to the converted Partnership Phantom Unit Awards, including vesting and payment timing provisions, as applicable.

F4 · derivative.expiration_date: Pursuant to the Merger, each outstanding phantom unit award granted under the Summit Midstream Partners, LP 2012 Long-Term Incentive Plan, as amended and restated, or the Summit Midstream Partners, LP 2022 Long-Term Incentive Plan, as amended (the "Partnership Phantom Unit Awards"), have been converted into an award of restricted stock units relating to a number of shares of common stock of the Corporation (the "Corporation RSUs") equal to the number of Common Units subject to such Partnership Phantom Unit Award, as of immediately prior to the Effective Time. The Corporation RSUs will be subject to substantially the same terms and conditions as were applicable to the converted Partnership Phantom Unit Awards, including vesting and payment timing provisions, as applicable.

F3 · derivative.underlying_shares: Pursuant to the Merger, immediately prior to the Effective Time, all outstanding common units representing limited partner interests in the Partnership (the "Common Units") have been converted into the right to receive shares of Common Stock, par value $0.01 per share, of the Corporation.

SEC source: 0002024218-24-000012 · wk-form4_1722648438.xml · nonDerivative · entry 1

Johnston James David · CIK 0001823482 · Executive VP, GC, CCO and Secy

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 48,201

F1 · kind: On August 1, 2024 (the "Effective Time"), in connection with the corporate reorganization of Summit Midstream Partners, LP (the "Partnership"), the Partnership converted from a master limited partnership to a C corporation (the "Corporate Reorganization") through the merger between the Partnership and Summit SMC NewCo, LLC ("Merger Sub"), a wholly-owned subsidiary of Summit Midstream Corporation (the "Corporation"), wherein Merger Sub merged with and into the Partnership (the "Merger"), with the Partnership surviving the Merger as a wholly-owned subsidiary of the Corporation.

F2 · kind: Pursuant to Rule 12g-3(e), the Corporation is the successor issuer to the Partnership for purposes of Section 16.

F3 · shares: Pursuant to the Merger, immediately prior to the Effective Time, all outstanding common units representing limited partner interests in the Partnership (the "Common Units") have been converted into the right to receive shares of Common Stock, par value $0.01 per share, of the Corporation.

F1 · price: On August 1, 2024 (the "Effective Time"), in connection with the corporate reorganization of Summit Midstream Partners, LP (the "Partnership"), the Partnership converted from a master limited partnership to a C corporation (the "Corporate Reorganization") through the merger between the Partnership and Summit SMC NewCo, LLC ("Merger Sub"), a wholly-owned subsidiary of Summit Midstream Corporation (the "Corporation"), wherein Merger Sub merged with and into the Partnership (the "Merger"), with the Partnership surviving the Merger as a wholly-owned subsidiary of the Corporation.