SMC

SEC source: 0002024218-25-000036 · wk-form4_1742345869.xml · nonDerivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 24,931

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each corporation restricted stock unit is the economic equivalent of one common stock.

SEC source: 0002024218-25-000035 · wk-form4_1742345745.xml · derivative · entry 11

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 94,867

Underlying: Common Stock · 8,543 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each corporation restricted stock unit is the economic equivalent of one common stock.

F8 · derivative.exercise_date: One-third of the corporation restricted stock units subject to the original award agreement vested on March 15, 2025, and the final one-third of the corporation restricted stock units shall vest on the third anniversary of the March 15, 2023, reference date, subject to continued employment. The Reporting Person received DERs for each corporation restricted stock unit, providing for payment on the vesting date of a lump sum of cash equal to the accrued distributions from and after the grant date of the corporation restricted stock units.

F4 · derivative.expiration_date: The corporation restricted stock units and associated DERs do not expire. The corporation restricted stock units are settled upon vesting in common stocks (on a one-for-one basis) or in cash, at the discretion of the Issuer.

SEC source: 0002024218-25-000035 · wk-form4_1742345745.xml · derivative · entry 10

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 103,410

Underlying: Common Stock · 7,782 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each corporation restricted stock unit is the economic equivalent of one common stock.

F7 · derivative.exercise_date: The final twenty percent of the corporation restricted stock units subject to the original award agreement vested on March 15, 2025, the third anniversary of the March 15, 2022, reference date. The Reporting Person received DERs for each corporation restricted stock unit, providing for payment on the vesting date of a lump sum of cash equal to the accrued distributions from and after the grant date of the corporation restricted stock units.

F4 · derivative.expiration_date: The corporation restricted stock units and associated DERs do not expire. The corporation restricted stock units are settled upon vesting in common stocks (on a one-for-one basis) or in cash, at the discretion of the Issuer.

SEC source: 0002024218-25-000035 · wk-form4_1742345745.xml · derivative · entry 9

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 111,192

Underlying: Common Stock · 5,369 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each corporation restricted stock unit is the economic equivalent of one common stock.

F6 · derivative.exercise_date: The final one-third of the corporation restricted stock units subject to the original award agreement vested on March 15, 2025, the third anniversary of the March 15, 2022, reference date. The Reporting Person received DERs for each corporation restricted stock unit, providing for payment on the vesting date of a lump sum of cash equal to the accrued distributions from and after the grant date of the corporation restricted stock units.

F4 · derivative.expiration_date: The corporation restricted stock units and associated DERs do not expire. The corporation restricted stock units are settled upon vesting in common stocks (on a one-for-one basis) or in cash, at the discretion of the Issuer.

SEC source: 0002024218-25-000035 · wk-form4_1742345745.xml · nonDerivative · entry 6

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 63,224

F2 · shares: Common stocks being withheld to pay tax liability.

SEC source: 0002024218-25-000035 · wk-form4_1742345745.xml · nonDerivative · entry 5

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 66,247

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each corporation restricted stock unit is the economic equivalent of one common stock.

SEC source: 0002024218-25-000035 · wk-form4_1742345745.xml · nonDerivative · entry 4

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 57,704

F2 · shares: Common stocks being withheld to pay tax liability.

SEC source: 0002024218-25-000035 · wk-form4_1742345745.xml · nonDerivative · entry 3

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 59,599

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each corporation restricted stock unit is the economic equivalent of one common stock.

SEC source: 0002024218-25-000035 · wk-form4_1742345745.xml · nonDerivative · entry 2

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 51,817

F2 · shares: Common stocks being withheld to pay tax liability.

SEC source: 0002024218-25-000035 · wk-form4_1742345745.xml · nonDerivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 53,125

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each corporation restricted stock unit is the economic equivalent of one common stock.

SEC source: 0002024218-25-000034 · wk-form4_1742345581.xml · derivative · entry 11

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 100,511

Underlying: Common Stock · 9,793 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each corporation restricted stock unit is the economic equivalent of one common stock.

F8 · derivative.exercise_date: One-third of the corporation restricted stock units subject to the original award agreement vested on March 15, 2025, and the final one-third of the corporation restricted stock units shall vest on the third anniversary of the March 15, 2023, reference date, subject to continued employment. The Reporting Person received DERs for each corporation restricted stock unit, providing for payment on the vesting date of a lump sum of cash equal to the accrued distributions from and after the grant date of the corporation restricted stock units.

F4 · derivative.expiration_date: The corporation restricted stock units and associated DERs do not expire. The corporation restricted stock units are settled upon vesting in common stocks (on a one-for-one basis) or in cash, at the discretion of the Issuer.

SEC source: 0002024218-25-000034 · wk-form4_1742345581.xml · derivative · entry 10

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 110,304

Underlying: Common Stock · 4,018 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each corporation restricted stock unit is the economic equivalent of one common stock.

F7 · derivative.exercise_date: The final twenty percent of the corporation restricted stock units subject to the original award agreement vested on March 15, 2025, the third anniversary of the March 15, 2022, reference date. The Reporting Person received DERs for each corporation restricted stock unit, providing for payment on the vesting date of a lump sum of cash equal to the accrued distributions from and after the grant date of the corporation restricted stock units.

F4 · derivative.expiration_date: The corporation restricted stock units and associated DERs do not expire. The corporation restricted stock units are settled upon vesting in common stocks (on a one-for-one basis) or in cash, at the discretion of the Issuer.

SEC source: 0002024218-25-000034 · wk-form4_1742345581.xml · derivative · entry 9

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 114,322

Underlying: Common Stock · 5,544 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each corporation restricted stock unit is the economic equivalent of one common stock.

F6 · derivative.exercise_date: The final one-third of the corporation restricted stock units subject to the original award agreement vested on March 15, 2025, the third anniversary of the March 15, 2022, reference date. The Reporting Person received DERs for each corporation restricted stock unit, providing for payment on the vesting date of a lump sum of cash equal to the accrued distributions from and after the grant date of the corporation restricted stock units.

F4 · derivative.expiration_date: The corporation restricted stock units and associated DERs do not expire. The corporation restricted stock units are settled upon vesting in common stocks (on a one-for-one basis) or in cash, at the discretion of the Issuer.

SEC source: 0002024218-25-000034 · wk-form4_1742345581.xml · nonDerivative · entry 6

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 49,816

F2 · shares: Common stocks being withheld to pay tax liability.

SEC source: 0002024218-25-000034 · wk-form4_1742345581.xml · nonDerivative · entry 5

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 53,211

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each corporation restricted stock unit is the economic equivalent of one common stock.

SEC source: 0002024218-25-000034 · wk-form4_1742345581.xml · nonDerivative · entry 4

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 43,418

F2 · shares: Common stocks being withheld to pay tax liability.

SEC source: 0002024218-25-000034 · wk-form4_1742345581.xml · nonDerivative · entry 3

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 44,397

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each corporation restricted stock unit is the economic equivalent of one common stock.

SEC source: 0002024218-25-000034 · wk-form4_1742345581.xml · nonDerivative · entry 2

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 40,379

F2 · shares: Common stocks being withheld to pay tax liability.

SEC source: 0002024218-25-000034 · wk-form4_1742345581.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: 41,729

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each corporation restricted stock unit is the economic equivalent of one common stock.

SEC source: 0002024218-25-000033 · wk-form4_1742345407.xml · derivative · entry 15

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 316,310

Underlying: Common Stock · 30,015 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each corporation restricted stock unit is the economic equivalent of one common stock.

F12 · derivative.exercise_date: One-third of the corporation restricted stock units subject to the original award agreement vested on March 15, 2025, and the final one-third of the corporation restricted stock units shall vest on the third anniversary of the March 15, 2023, reference date, subject to continued employment. The Reporting Person received DERs for each corporation restricted stock unit, providing for payment on the vesting date of a lump sum of cash equal to the accrued distributions from and after the grant date of the corporation restricted stock units.

F8 · derivative.expiration_date: The corporation restricted stock units and associated DERs do not expire. The corporation restricted stock units are settled upon vesting in common stocks (on a one-for-one basis) or in cash, at the discretion of the Issuer.

SEC source: 0002024218-25-000033 · wk-form4_1742345407.xml · derivative · entry 14

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 346,325

Underlying: Common Stock · 25,993 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each corporation restricted stock unit is the economic equivalent of one common stock.

F11 · derivative.exercise_date: The final twenty percent of the corporation restricted stock units subject to the original award agreement vested on March 15, 2025, the third anniversary of the March 15, 2022, reference date. The Reporting Person received DERs for each corporation restricted stock unit, providing for payment on the vesting date of a lump sum of cash equal to the accrued distributions from and after the grant date of the corporation restricted stock units.

F8 · derivative.expiration_date: The corporation restricted stock units and associated DERs do not expire. The corporation restricted stock units are settled upon vesting in common stocks (on a one-for-one basis) or in cash, at the discretion of the Issuer.

SEC source: 0002024218-25-000033 · wk-form4_1742345407.xml · derivative · entry 13

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 372,318

Underlying: Common Stock · 17,934 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each corporation restricted stock unit is the economic equivalent of one common stock.

F10 · derivative.exercise_date: The final one-third of the corporation restricted stock units subject to the original award agreement vested on March 15, 2025, the third anniversary of the March 15, 2022, reference date. The Reporting Person received DERs for each corporation restricted stock unit, providing for payment on the vesting date of a lump sum of cash equal to the accrued distributions from and after the grant date of the corporation restricted stock units.

F8 · derivative.expiration_date: The corporation restricted stock units and associated DERs do not expire. The corporation restricted stock units are settled upon vesting in common stocks (on a one-for-one basis) or in cash, at the discretion of the Issuer.

SEC source: 0002024218-25-000033 · wk-form4_1742345407.xml · nonDerivative · entry 6

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 276,170

F2 · shares: Common stocks being withheld to pay tax liability.

SEC source: 0002024218-25-000033 · wk-form4_1742345407.xml · nonDerivative · entry 5

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 287,981

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each corporation restricted stock unit is the economic equivalent of one common stock.

SEC source: 0002024218-25-000033 · wk-form4_1742345407.xml · nonDerivative · entry 4

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 257,966

F2 · shares: Common stocks being withheld to pay tax liability.

SEC source: 0002024218-25-000033 · wk-form4_1742345407.xml · nonDerivative · entry 3

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 268,195

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each corporation restricted stock unit is the economic equivalent of one common stock.

SEC source: 0002024218-25-000033 · wk-form4_1742345407.xml · nonDerivative · entry 2

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 242,202

F2 · shares: Common stocks being withheld to pay tax liability.

SEC source: 0002024218-25-000033 · wk-form4_1742345407.xml · nonDerivative · entry 1

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 249,260

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each corporation restricted stock unit is the economic equivalent of one common stock.

SEC source: 0002024218-25-000026 · wk-form4_1741987019.xml · nonDerivative · entry 4

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 231,326

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.

F5 · price: The price reported in Column 4 is a weighted average price and has been rounded to the nearest cent. These Common Stocks were sold in multiple transactions at prices ranging from $37.285 to $37.73, inclusive. The reporting person undertakes to provide to Summit Midstream Corporation, any security holder of Summit Midstream Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of Common Stocks sold at each separate price within the ranges set forth in footnote 5 to this Form 4.

SEC source: 0002024218-25-000030 · wk-form4_1742330759.xml · nonDerivative · entry 1

Oates Rommel M. · CIK 0001916097 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 22,437

SEC source: 0002024218-25-000036 · wk-form4_1742345869.xml · derivative · entry 8

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 40,407

Underlying: Common Stock · 4,531 shares

Expires not disclosed

F1 · derivative.exercise_price: Each corporation restricted stock unit is the economic equivalent of one common stock.

F5 · derivative.exercise_date: The corporation restricted stock units shall vest if and to the extent that the corporation restricted stock units are earned during the performance period from January 1, 2025 through December 31, 2027, which will depend on whether the performance criteria are achieved as determined by the committee as soon as reasonably practicable, but no later than sixty (60) days following December 31, 2027, the last day of the Performance Period. The vesting of the corporation restricted stock units is subject to continued employment and accelerated vesting as provided in the applicable award agreement. The Reporting Person will receive DERs for each corporation restricted stock unit, providing for payment on the vesting date of a lump sum of cash equal to the accrued distributions from and after the grant date of the corporation restricted stock units.

F4 · derivative.expiration_date: The corporation restricted stock units and associated DERs do not expire. The corporation restricted stock units are settled upon vesting in common stocks (on a one-for-one basis) or in cash, at the discretion of the Issuer.

SEC source: 0002024218-25-000036 · wk-form4_1742345869.xml · derivative · entry 7

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 35,876

Underlying: Common Stock · 4,531 shares

Expires not disclosed

F1 · derivative.exercise_price: Each corporation restricted stock unit is the economic equivalent of one common stock.

F3 · derivative.exercise_date: One-third of the corporation restricted stock units (rounded down to the nearest whole number of units, except in the case of the final vesting date) shall vest on each of the first, second and third anniversaries of the March 14, 2025, reference date, subject to continued employment and accelerated vesting as provided in the applicable award agreement. The Reporting Person will receive distribution equivalent rights ("DERs") for each corporation restricted stock unit, providing for payment on the vesting date of a lump sum of cash equal to the accrued distributions from and after the grant date of the corporation restricted stock units.

F4 · derivative.expiration_date: The corporation restricted stock units and associated DERs do not expire. The corporation restricted stock units are settled upon vesting in common stocks (on a one-for-one basis) or in cash, at the discretion of the Issuer.

SEC source: 0002024218-25-000035 · wk-form4_1742345745.xml · derivative · entry 8

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 116,561

Underlying: Common Stock · 14,377 shares

Expires not disclosed

F1 · derivative.exercise_price: Each corporation restricted stock unit is the economic equivalent of one common stock.

F5 · derivative.exercise_date: The corporation restricted stock units shall vest if and to the extent that the corporation restricted stock units are earned during the performance period from January 1, 2025 through December 31, 2027, which will depend on whether the performance criteria are achieved as determined by the committee as soon as reasonably practicable, but no later than sixty (60) days following December 31, 2027, the last day of the Performance Period. The vesting of the corporation restricted stock units is subject to continued employment and accelerated vesting as provided in the applicable award agreement. The Reporting Person will receive DERs for each corporation restricted stock unit, providing for payment on the vesting date of a lump sum of cash equal to the accrued distributions from and after the grant date of the corporation restricted stock units.

F4 · derivative.expiration_date: The corporation restricted stock units and associated DERs do not expire. The corporation restricted stock units are settled upon vesting in common stocks (on a one-for-one basis) or in cash, at the discretion of the Issuer.

SEC source: 0002024218-25-000035 · wk-form4_1742345745.xml · derivative · entry 7

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 102,184

Underlying: Common Stock · 14,377 shares

Expires not disclosed

F1 · derivative.exercise_price: Each corporation restricted stock unit is the economic equivalent of one common stock.

F3 · derivative.exercise_date: One-third of the corporation restricted stock units (rounded down to the nearest whole number of units, except in the case of the final vesting date) shall vest on each of the first, second and third anniversaries of the March 14, 2025, reference date, subject to continued employment and accelerated vesting as provided in the applicable award agreement. The Reporting Person will receive distribution equivalent rights ("DERs") for each corporation restricted stock unit, providing for payment on the vesting date of a lump sum of cash equal to the accrued distributions from and after the grant date of the corporation restricted stock units.

F4 · derivative.expiration_date: The corporation restricted stock units and associated DERs do not expire. The corporation restricted stock units are settled upon vesting in common stocks (on a one-for-one basis) or in cash, at the discretion of the Issuer.

SEC source: 0002024218-25-000034 · wk-form4_1742345581.xml · derivative · entry 8

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 119,866

Underlying: Common Stock · 13,958 shares

Expires not disclosed

F1 · derivative.exercise_price: Each corporation restricted stock unit is the economic equivalent of one common stock.

F5 · derivative.exercise_date: The corporation restricted stock units shall vest if and to the extent that the corporation restricted stock units are earned during the performance period from January 1, 2025 through December 31, 2027, which will depend on whether the performance criteria are achieved as determined by the committee as soon as reasonably practicable, but no later than sixty (60) days following December 31, 2027, the last day of the Performance Period. The vesting of the corporation restricted stock units is subject to continued employment and accelerated vesting as provided in the applicable award agreement. The Reporting Person will receive DERs for each corporation restricted stock unit, providing for payment on the vesting date of a lump sum of cash equal to the accrued distributions from and after the grant date of the corporation restricted stock units.

F4 · derivative.expiration_date: The corporation restricted stock units and associated DERs do not expire. The corporation restricted stock units are settled upon vesting in common stocks (on a one-for-one basis) or in cash, at the discretion of the Issuer.

SEC source: 0002024218-25-000034 · wk-form4_1742345581.xml · derivative · entry 7

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 105,908

Underlying: Common Stock · 13,958 shares

Expires not disclosed

F1 · derivative.exercise_price: Each corporation restricted stock unit is the economic equivalent of one common stock.

F3 · derivative.exercise_date: One-third of the corporation restricted stock units (rounded down to the nearest whole number of units, except in the case of the final vesting date) shall vest on each of the first, second and third anniversaries of the March 14, 2025, reference date, subject to continued employment and accelerated vesting as provided in the applicable award agreement. The Reporting Person will receive distribution equivalent rights ("DERs") for each corporation restricted stock unit, providing for payment on the vesting date of a lump sum of cash equal to the accrued distributions from and after the grant date of the corporation restricted stock units.

F4 · derivative.expiration_date: The corporation restricted stock units and associated DERs do not expire. The corporation restricted stock units are settled upon vesting in common stocks (on a one-for-one basis) or in cash, at the discretion of the Issuer.

SEC source: 0002024218-25-000032 · wk-form4_1742330998.xml · nonDerivative · entry 1

PETERS JERRY L · CIK 0001237636 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By Joint Spousal Trust

Disclosed balance after: 33,301

F1 · ownership.direct: The common stocks which due to administrative error were previously reported as being held directly, are held indirectly by Joint Spousal Trust.

F2 · ownership.nature: The Reporting Person is a trustee of the Joint Spousal Trust. The Reporting Person and his spouse are the sole beneficiaries of the Joint Spousal Trust.

SEC source: 0002024218-25-000033 · wk-form4_1742345407.xml · derivative · entry 12

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 390,252

Underlying: Common Stock · 47,624 shares

Expires not disclosed

F1 · derivative.exercise_price: Each corporation restricted stock unit is the economic equivalent of one common stock.

F9 · derivative.exercise_date: The corporation restricted stock units shall vest if and to the extent that the corporation restricted stock units are earned during the performance period from January 1, 2025 through December 31, 2027, which will depend on whether the performance criteria are achieved as determined by the committee as soon as reasonably practicable, but no later than sixty (60) days following December 31, 2027, the last day of the Performance Period. The vesting of the corporation restricted stock units is subject to continued employment and accelerated vesting as provided in the applicable award agreement. The Reporting Person will receive DERs for each corporation restricted stock unit, providing for payment on the vesting date of a lump sum of cash equal to the accrued distributions from and after the grant date of the corporation restricted stock units.

F8 · derivative.expiration_date: The corporation restricted stock units and associated DERs do not expire. The corporation restricted stock units are settled upon vesting in common stocks (on a one-for-one basis) or in cash, at the discretion of the Issuer.

SEC source: 0002024218-25-000033 · wk-form4_1742345407.xml · derivative · entry 11

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 342,628

Underlying: Common Stock · 47,624 shares

Expires not disclosed

F1 · derivative.exercise_price: Each corporation restricted stock unit is the economic equivalent of one common stock.

F7 · derivative.exercise_date: One-third of the corporation restricted stock units (rounded down to the nearest whole number of units, except in the case of the final vesting date) shall vest on each of the first, second and third anniversaries of the March 14, 2025, reference date, subject to continued employment and accelerated vesting as provided in the applicable award agreement. The Reporting Person will receive distribution equivalent rights ("DERs") for each corporation restricted stock unit, providing for payment on the vesting date of a lump sum of cash equal to the accrued distributions from and after the grant date of the corporation restricted stock units.

F8 · derivative.expiration_date: The corporation restricted stock units and associated DERs do not expire. The corporation restricted stock units are settled upon vesting in common stocks (on a one-for-one basis) or in cash, at the discretion of the Issuer.

SEC source: 0002024218-25-000031 · wk-form4_1742330874.xml · nonDerivative · entry 1

Woung-Chapman Marguerite · CIK 0001531214 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 33,271

SEC source: 0002024218-25-000029 · wk-form4_1742330651.xml · nonDerivative · entry 1

McNally Robert Joseph · CIK 0001351732 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 33,271

SEC source: 0002024218-25-000028 · wk-form4_1742330429.xml · nonDerivative · entry 1

Jacobe James Lee · CIK 0001774293 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 41,953

SEC source: 0002024218-25-000027 · wk-form4_1742330288.xml · nonDerivative · entry 1

CLEARY JAMES J · CIK 0001326432 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 33,271

SEC source: 0002024218-25-000043 · wk-form4a_1745880334.xml · nonDerivative · entry 1

PETERS JERRY L · CIK 0001237636 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,062

F1 · balance_after: On March 18, 2025, the Reporting Person filed a Form 4 to report an award of 3,062 common stocks granted on March 14, 2025. But due to administrative error they were reported as being held indirectly by Joint Spousal Trust. This Form 4/A amends the Form 4 filed on March 18, 2025, so that such Form 4, as amended, reflects the 3,062 common stocks directly held by the Reporting Person.

F1 · ownership.direct: On March 18, 2025, the Reporting Person filed a Form 4 to report an award of 3,062 common stocks granted on March 14, 2025. But due to administrative error they were reported as being held indirectly by Joint Spousal Trust. This Form 4/A amends the Form 4 filed on March 18, 2025, so that such Form 4, as amended, reflects the 3,062 common stocks directly held by the Reporting Person.

SEC source: 0002024218-25-000026 · wk-form4_1741987019.xml · nonDerivative · entry 3

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 232,326

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.

F4 · price: The price reported in Column 4 is a weighted average price and has been rounded to the nearest cent. These Common Stocks were sold in multiple transactions at prices ranging from $36.81 to $37.49, inclusive. The reporting person undertakes to provide to Summit Midstream Corporation, any security holder of Summit Midstream Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of Common Stocks sold at each separate price within the ranges set forth in footnote 4 to this Form 4.

SEC source: 0002024218-25-000026 · wk-form4_1741987019.xml · nonDerivative · entry 2

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 233,326

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.

F3 · price: The price reported in Column 4 is a weighted average price and has been rounded to the nearest cent. These Common Stocks were sold in multiple transactions at prices ranging from $38.58 to $38.64, inclusive. The reporting person undertakes to provide to Summit Midstream Corporation, any security holder of Summit Midstream Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of Common Stocks sold at each separate price within the ranges set forth in footnote 3 to this Form 4.

SEC source: 0002024218-25-000026 · wk-form4_1741987019.xml · nonDerivative · entry 1

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 233,526

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.

F2 · price: The price reported in Column 4 is a weighted average price and has been rounded to the nearest cent. These Common Stocks were sold in multiple transactions at prices ranging from $37.52 to $38.29, inclusive. The reporting person undertakes to provide to Summit Midstream Corporation, any security holder of Summit Midstream Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of Common Stocks sold at each separate price within the ranges set forth in footnote 2 to this Form 4.

SEC source: 0002024218-25-000021 · wk-form4_1741729820.xml · nonDerivative · entry 6

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 234,326

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.

F7 · price: The price reported in Column 4 is a weighted average price and has been rounded to the nearest cent. These Common Stocks were sold in multiple transactions at prices ranging from $38.49 to $38.65, inclusive. The reporting person undertakes to provide to Summit Midstream Corporation, any security holder of Summit Midstream Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of Common Stocks sold at each separate price within the ranges set forth in footnote 7 to this Form 4.

SEC source: 0002024218-25-000021 · wk-form4_1741729820.xml · nonDerivative · entry 5

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 234,526

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.

F6 · price: The price reported in Column 4 is a weighted average price and has been rounded to the nearest cent. These Common Stocks were sold in multiple transactions at prices ranging from $37.33 to $38.13, inclusive. The reporting person undertakes to provide to Summit Midstream Corporation, any security holder of Summit Midstream Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of Common Stocks sold at each separate price within the ranges set forth in footnote 6 to this Form 4.

SEC source: 0002024218-25-000021 · wk-form4_1741729820.xml · nonDerivative · entry 4

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 235,326

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.

F5 · price: The price reported in Column 4 is a weighted average price and has been rounded to the nearest cent. These Common Stocks were sold in multiple transactions at prices ranging from $39.11 to $39.82, inclusive. The reporting person undertakes to provide to Summit Midstream Corporation, any security holder of Summit Midstream Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of Common Stocks sold at each separate price within the ranges set forth in footnote 5 to this Form 4.