Johnston James David

SEC source: 0001549922-24-000035 · wk-form4_1710893978.xml · nonDerivative · entry 2

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 30,611

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.

F4 · price: Each phantom unit is the economic equivalent of one common unit.

SEC source: 0001549922-24-000035 · wk-form4_1710893978.xml · nonDerivative · entry 1

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 22,250

F1 · kind: These units 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 units were sold in multiple transactions at prices ranging from $20.24 to $20.25, inclusive. The reporting person undertakes to provide to Summit Midstream Partners, LP, any security holder of Summit Midstream Partners, LP, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of units sold at each separate price within the ranges set forth in footnote 2 to this Form 4.

F3 · balance_after: On November 9, 2020, the Issuer effected a 1-for-15 reverse unit split (the "Reverse Unit Split"). Pursuant to the Reverse Unit Split, common unitholders received one common unit for every 15 common units owned at the close of business on November 9, 2020. All fractional units created by the Reverse Unit Split were rounded to the nearest whole unit. The common units began trading on a split-adjusted basis on November 10, 2020. After giving effect to the Reverse Unit Split, the number of issued and outstanding common units decreased to 3,774,992.

SEC source: 0001549922-24-000025 · wk-form4_1709770061.xml · nonDerivative · entry 1

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 22,850

F1 · kind: These units 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 · balance_after: The price reported in Column 4 is a weighted average price and has been rounded to the nearest cent. These units were sold in multiple transactions at prices ranging from $20.03 to $20.41, inclusive. The reporting person undertakes to provide to Summit Midstream Partners, LP, any security holder of Summit Midstream Partners, LP, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of units sold at each separate price within the ranges set forth in footnote 2 to this Form 4.

SEC source: 0001549922-24-000024 · wk-form4_1709333386.xml · nonDerivative · entry 1

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 26,150

F1 · kind: These units 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 units were sold in multiple transactions at prices ranging from $20.10 to $20.12, inclusive. The reporting person undertakes to provide to Summit Midstream Partners, LP, any security holder of Summit Midstream Partners, LP, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of units sold at each separate price within the ranges set forth in footnote 2 to this Form 4.

SEC source: 0001549922-24-000021 · wk-form4_1705931830.xml · derivative · entry 2

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 21,589

Underlying: Common Units · 21,589 shares

Expires not disclosed

F1 · derivative.exercise_price: Each phantom unit is the economic equivalent of one common unit.

F4 · derivative.exercise_date: The phantom units shall vest if and to the extent that the phantom units are earned during the performance period from January 1, 2024 through December 31, 2026, which will depend on whether the performance criteria are achieved as determined by the committee as soon as reasonably practicable, but no later than Friday, March 6, 2027. The vesting of the phantom units is subject to continued employment and accelerated vesting as provided in the applicable award agreement. The Reporting Person will receive DERs for each phantom 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 phantom units.

F3 · derivative.expiration_date: The phantom units and associated DERs do not expire. The phantom units are settled upon vesting in common units (on a one-for-one basis) or in cash, at the discretion of the Issuer.

F5 · balance_after: After giving effect to the transactions reported in this Report, the Reporting Person holds an aggregate 141,752 phantom units. This total includes phantom units from other tranches with different vesting dates.

SEC source: 0001549922-24-000021 · wk-form4_1705931830.xml · derivative · entry 1

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 32,383

Underlying: Common Units · 32,383 shares

Expires not disclosed

F1 · derivative.exercise_price: Each phantom unit is the economic equivalent of one common unit.

F2 · derivative.exercise_date: One-third of the phantom 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 January 18, 2024 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 phantom 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 phantom units.

F3 · derivative.expiration_date: The phantom units and associated DERs do not expire. The phantom units are settled upon vesting in common units (on a one-for-one basis) or in cash, at the discretion of the Issuer.

SEC source: 0001209191-23-055205 · doc4.xml · nonDerivative · entry 2

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 26,850

F1 · kind: These units 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 units were sold in multiple transactions at prices ranging from $20.05 to $20.72, inclusive. The reporting person undertakes to provide to Summit Midstream Partners, LP, any security holder of Summit Midstream Partners, LP, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of units sold at each separate price within the ranges set forth in footnote 3 to this Form 4.

SEC source: 0001209191-23-055205 · doc4.xml · nonDerivative · entry 1

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 27,381

F1 · kind: These units 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 units were sold in multiple transactions at prices ranging from $20.05 to $20.60, inclusive. The reporting person undertakes to provide to Summit Midstream Partners, LP, any security holder of Summit Midstream Partners, LP, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of units sold at each separate price within the ranges set forth in footnote 2 to this Form 4.

SEC source: 0001209191-23-054737 · doc4.xml · nonDerivative · entry 3

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 29,376

F1 · kind: These units 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 units were sold in multiple transactions at prices ranging from $20.00 to $20.04, inclusive. The reporting person undertakes to provide to Summit Midstream Partners, LP, any security holder of Summit Midstream Partners, LP, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of units sold at each separate price within the ranges set forth in footnote 4 to this Form 4.

SEC source: 0001209191-23-054737 · doc4.xml · nonDerivative · entry 2

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 29,636

F1 · kind: These units 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 units were sold in multiple transactions at prices ranging from $20.00 to $20.25, inclusive. The reporting person undertakes to provide to Summit Midstream Partners, LP, any security holder of Summit Midstream Partners, LP, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of units sold at each separate price within the ranges set forth in footnote 3 to this Form 4.

SEC source: 0001209191-23-054737 · doc4.xml · nonDerivative · entry 1

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 31,230

F1 · kind: These units 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 units were sold in multiple transactions at prices ranging from $20.05 to $20.45, inclusive. The reporting person undertakes to provide to Summit Midstream Partners, LP, any security holder of Summit Midstream Partners, LP, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of units sold at each separate price within the ranges set forth in footnote 2 to this Form 4.

SEC source: 0001209191-23-054418 · doc4.xml · nonDerivative · entry 1

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 32,047

F1 · kind: These units 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 units were sold in multiple transactions at prices ranging from $20.00 to $20.30, inclusive. The reporting person undertakes to provide to Summit Midstream Partners, LP, any security holder of Summit Midstream Partners, LP, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of units sold at each separate price within the ranges set forth in footnote 2 to this Form 4.

SEC source: 0001209191-23-052572 · doc4.xml · nonDerivative · entry 1

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 32,288

F1 · kind: These units 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 units were sold in multiple transactions at prices ranging from $20.00 to $20.39, inclusive. The reporting person undertakes to provide to Summit Midstream Partners, LP, any security holder of Summit Midstream Partners, LP, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of units sold at each separate price within the ranges set forth in footnote 2 to this Form 4.

F3 · balance_after: Due to administrative error, the amount of common units in Table I, Box 5 of the Form 4 filed on June 16, 2023 was incorrectly stated at 35,262. The correct amount was 34,850. The amount of common units beneficially owned following the current 10b5-1(c) sale of 2,562 units is 32,288, reported above.

SEC source: 0001209191-23-037677 · doc4.xml · nonDerivative · entry 1

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 35,262

F1 · kind: These units 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: 0001209191-23-019932 · doc4.xml · derivative · entry 15

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 16,072

Underlying: Common Units · 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.

F2 · derivative.exercise_price: Each phantom unit is the economic equivalent of one common unit.

F10 · derivative.exercise_date: Twenty percent of the phantom units (rounded down to the nearest whole number of units, except in the case of the final vesting date) vested on March 15, 2023 and sixty percent and twenty percent of the phantom unites shall respectively vest on the second and third anniversaries of March 15, 2022, the reference date, subject to continued employment and accelerated vesting as provided in the applicable award agreement. The Reporting Person received DERs for each phantom 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 phantom units.

F5 · derivative.expiration_date: The phantom units and associated DERs do not expire. The phantom units are settled upon vesting in common units (on a one-for-one basis) or in cash, at the discretion of the Issuer.

F11 · balance_after: After giving effect to the transactions reported in this Report, the Reporting Person holds an aggregate 87,780 phantom units. This total includes phantom units from other tranches with different vesting dates.

SEC source: 0001209191-23-019932 · doc4.xml · derivative · entry 14

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,253

Underlying: Common Units · 3,253 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.

F2 · derivative.exercise_price: Each phantom unit is the economic equivalent of one common unit.

F9 · derivative.exercise_date: One-half of the phantom units (rounded down to the nearest whole number of units, except in the case of the final vesting date) vested on March 15, 2023, and the other half shall vest on March 15, 2024, subject to continued employment and accelerated vesting as provided in the applicable award agreement. The Reporting Person received DERs for each phantom 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 phantom units.

F5 · derivative.expiration_date: The phantom units and associated DERs do not expire. The phantom units are settled upon vesting in common units (on a one-for-one basis) or in cash, at the discretion of the Issuer.

SEC source: 0001209191-23-019932 · doc4.xml · derivative · entry 13

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 11,089

Underlying: Common Units · 5,545 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.

F2 · derivative.exercise_price: Each phantom unit is the economic equivalent of one common unit.

F8 · derivative.exercise_date: One-third of the phantom units subject to the original award agreement vested on March 15, 2023, with the remaining phantom units subject to vesting on the second and third anniversaries of the March 15, 2022 reference date, subject to continued employment. The Reporting Person received DERs for each phantom 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 phantom units.

F5 · derivative.expiration_date: The phantom units and associated DERs do not expire. The phantom units are settled upon vesting in common units (on a one-for-one basis) or in cash, at the discretion of the Issuer.

SEC source: 0001209191-23-019932 · doc4.xml · derivative · entry 12

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 8,361

Underlying: Common Units · 8,361 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.

F2 · derivative.exercise_price: Each phantom unit is the economic equivalent of one common unit.

F7 · derivative.exercise_date: One-third of the phantom units subject to the original award agreement vested on March 15, 2023, with the final one-third of the phantom units subject to vesting on the third anniversary of the March 15, 2021 reference date, subject to continued employment. The Reporting Person received DERs for each phantom 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 phantom units.

F5 · derivative.expiration_date: The phantom units and associated DERs do not expire. The phantom units are settled upon vesting in common units (on a one-for-one basis) or in cash, at the discretion of the Issuer.

SEC source: 0001209191-23-019932 · doc4.xml · derivative · entry 11

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 19,625

Underlying: Common Units · 19,625 shares

Expires not disclosed

F2 · derivative.exercise_price: Each phantom unit is the economic equivalent of one common unit.

F6 · derivative.exercise_date: The phantom units shall vest if and to the extent that the phantom units are earned during the performance period from January 1, 2023 through December 31, 2025, which will depend on whether the performance criteria are achieved as determined by the committee as soon as reasonably practicable, but no later than Friday, March 6, 2026. The vesting of the phantom units is subject to continued employment and accelerated vesting as provided in the applicable award agreement. The Reporting Person will receive DERs for each phantom 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 phantom units.

F5 · derivative.expiration_date: The phantom units and associated DERs do not expire. The phantom units are settled upon vesting in common units (on a one-for-one basis) or in cash, at the discretion of the Issuer.

SEC source: 0001209191-23-019932 · doc4.xml · derivative · entry 10

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 29,380

Underlying: Common Units · 29,380 shares

Expires not disclosed

F2 · derivative.exercise_price: Each phantom unit is the economic equivalent of one common unit.

F4 · derivative.exercise_date: One-third of the phantom 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 15, 2023 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 phantom 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 phantom units.

F5 · derivative.expiration_date: The phantom units and associated DERs do not expire. The phantom units are settled upon vesting in common units (on a one-for-one basis) or in cash, at the discretion of the Issuer.

SEC source: 0001209191-23-019932 · doc4.xml · nonDerivative · entry 9

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 36,749

F3 · shares: Common units being withheld to pay tax liability.

SEC source: 0001209191-23-019932 · doc4.xml · nonDerivative · entry 8

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 38,331

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.

F2 · price: Each phantom unit is the economic equivalent of one common unit.

SEC source: 0001209191-23-019932 · doc4.xml · nonDerivative · entry 7

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 33,901

F3 · shares: Common units being withheld to pay tax liability.

SEC source: 0001209191-23-019932 · doc4.xml · nonDerivative · entry 6

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 34,851

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.

F2 · price: Each phantom unit is the economic equivalent of one common unit.

SEC source: 0001209191-23-019932 · doc4.xml · nonDerivative · entry 5

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 31,598

F3 · shares: Common units being withheld to pay tax liability.

SEC source: 0001209191-23-019932 · doc4.xml · nonDerivative · entry 4

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 32,948

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.

F2 · price: Each phantom unit is the economic equivalent of one common unit.

SEC source: 0001209191-23-019932 · doc4.xml · nonDerivative · entry 3

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 27,403

F3 · shares: Common units being withheld to pay tax liability.

SEC source: 0001209191-23-019932 · doc4.xml · nonDerivative · entry 2

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 29,439

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.

F2 · price: Each phantom unit is the economic equivalent of one common unit.

SEC source: 0001209191-23-019932 · doc4.xml · nonDerivative · entry 1

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 21,078

F1 · kind: These units 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: 0001209191-23-017445 · doc4.xml · nonDerivative · entry 1

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 21,166

F1 · kind: These units 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: 0001209191-22-061765 · doc4.xml · nonDerivative · entry 1

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 22,741

F1 · kind: These units 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: 0001209191-22-060948 · doc4.xml · derivative · entry 2

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 20,090

Underlying: Common Units · 20,090 shares

Expires not disclosed

F1 · derivative.exercise_price: Each phantom unit is the economic equivalent of one common unit.

F2 · kind: The phantom units have been awarded in connection with a compensation agreement approved by the Compensation Committee of the Board of Directors of Summit Midstream GP, LLC (the "Company") on November 29, 2022, permitting executive officers, to forfeit none, 50% or 100% of each vesting tranche of his or her outstanding retention cash component awards granted in each of 2020, 2021 and 2022 in exchange for phantom units to be granted under the Summit Midstream Partners, LP 2022 Long-Term Incentive Plan (the "Plan").

F6 · price: The price for each Phantom Unit was calculated from the volume weighted average price of a common unit of the Company during the three trading days ending on and including the date of grant.

F7 · derivative.exercise_date: Twenty percent, sixty percent and twenty percent of the phantom units (rounded down to the nearest whole number of units, except in the case of the final vesting date) shall respectively vest on the first, second and third anniversaries of March 15, 2022, the Reference Date, subject to continued employment and accelerated vesting as provided in the applicable award agreement. The Reporting Person will receive DERs for each phantom 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 phantom units.

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

F5 · derivative.underlying_shares: The corresponding number of Phantom Units granted pursuant to the Plan was determined by dividing the cash value of the applicable vesting tranche of the cash retention component award forfeited by such participant by the volume weighted average price of a common unit of the Company during the three trading days ending on and including the date of grant. Due to an oversubscription of the phantom units, the Reporting Person received only 98.54% of the phantom units elected.

F8 · balance_after: After giving effect to the transactions reported in this Report, the Reporting Person holds an aggregate 59,952 phantom units. This total includes phantom units from other tranches with different vesting dates.

SEC source: 0001209191-22-060948 · doc4.xml · derivative · entry 1

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,506

Underlying: Common Units · 6,506 shares

Expires not disclosed

F1 · derivative.exercise_price: Each phantom unit is the economic equivalent of one common unit.

F2 · kind: The phantom units have been awarded in connection with a compensation agreement approved by the Compensation Committee of the Board of Directors of Summit Midstream GP, LLC (the "Company") on November 29, 2022, permitting executive officers, to forfeit none, 50% or 100% of each vesting tranche of his or her outstanding retention cash component awards granted in each of 2020, 2021 and 2022 in exchange for phantom units to be granted under the Summit Midstream Partners, LP 2022 Long-Term Incentive Plan (the "Plan").

F6 · price: The price for each Phantom Unit was calculated from the volume weighted average price of a common unit of the Company during the three trading days ending on and including the date of grant.

F3 · derivative.exercise_date: One-half of the phantom units (rounded down to the nearest whole number of units, except in the case of the final vesting date) shall vest on March 15, 2023, and the other half shall vest on March 15, 2024, 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 phantom 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 phantom units.

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

F5 · derivative.underlying_shares: The corresponding number of Phantom Units granted pursuant to the Plan was determined by dividing the cash value of the applicable vesting tranche of the cash retention component award forfeited by such participant by the volume weighted average price of a common unit of the Company during the three trading days ending on and including the date of grant. Due to an oversubscription of the phantom units, the Reporting Person received only 98.54% of the phantom units elected.

SEC source: 0001209191-22-054588 · doc4.xml · nonDerivative · entry 1

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 24,316

F1 · kind: These units 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: 0001209191-22-054044 · doc4.xml · nonDerivative · entry 2

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 25,873

F1 · kind: These units 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: 0001209191-22-054044 · doc4.xml · nonDerivative · entry 1

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 25,891

F1 · kind: These units 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: 0001209191-22-050972 · doc4.xml · nonDerivative · entry 1

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 27,464

F1 · kind: These units 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: 0001209191-22-045721 · doc4.xml · nonDerivative · entry 1

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 27,466

F1 · kind: These units 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: 0001209191-22-022174 · doc4.xml · derivative · entry 3

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Units · 16,666 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 phantom unit is the economic equivalent of one common unit.

F4 · derivative.exercise_date: One-half of the phantom units (rounded down to the nearest whole number of units, except in the case of the final vesting date) vested on March 31, 2021, and the other half vested on March 31, 2022, subject to continued employment and accelerated vesting as provided in the applicable award agreement. The Reporting Person received Distribution Equivalent Rights ("DERs") for each phantom unit, if applicable, providing for payment on the vesting date of a lump sum of cash equal to any accrued distributions from and after the grant date of the phantom units.

F5 · derivative.expiration_date: The phantom units and associated DERs do not expire. The phantom units are settled upon vesting in common units (on a one-for-one basis) or in cash, at the discretion of the Issuer.

F2 · balance_after: On November 9, 2020, the Issuer effected a 1-for-15 reverse unit split (the "Reverse Unit Split"). Pursuant to the Reverse Unit Split, common unitholders received one common unit for every 15 common units owned at the close of business on November 9, 2020. All fractional units created by the Reverse Unit Split were rounded to the nearest whole unit. The common units began trading on a split-adjusted basis on November 10, 2020. After giving effect to the Reverse Unit Split, the number of issued and outstanding common units decreased to 3,774,992.

F6 · balance_after: After giving effect to the transactions reported in this Report, the Reporting Person holds an aggregate 33,356 phantom units.

SEC source: 0001209191-22-022174 · doc4.xml · nonDerivative · entry 2

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 29,041

F3 · shares: Common Units being withheld to pay tax liability.

SEC source: 0001209191-22-022174 · doc4.xml · nonDerivative · entry 1

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 35,600

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 phantom unit is the economic equivalent of one common unit.

F2 · balance_after: On November 9, 2020, the Issuer effected a 1-for-15 reverse unit split (the "Reverse Unit Split"). Pursuant to the Reverse Unit Split, common unitholders received one common unit for every 15 common units owned at the close of business on November 9, 2020. All fractional units created by the Reverse Unit Split were rounded to the nearest whole unit. The common units began trading on a split-adjusted basis on November 10, 2020. After giving effect to the Reverse Unit Split, the number of issued and outstanding common units decreased to 3,774,992.

SEC source: 0001209191-22-019369 · doc4.xml · derivative · entry 4

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 16,722

Underlying: Common Units · 8,361 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 phantom unit is the economic equivalent of one common unit.

F6 · derivative.exercise_date: One-third of the phantom units subject to the original award agreement vested on March 15, 2022, with the remaining phantom units subject to vesting on the second and third anniversaries of the March 15, 2021 reference date, subject to continued employment. The Reporting Person received DERs for each phantom 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 phantom units.

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

F5 · balance_after: After giving effect to the transactions reported in this Report, the Reporting Person holds an aggregate 50,022 phantom units.

SEC source: 0001209191-22-019369 · doc4.xml · nonDerivative · entry 2

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 18,934

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

SEC source: 0001209191-22-019369 · doc4.xml · nonDerivative · entry 1

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 20,970

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 phantom unit is the economic equivalent of one common unit.

SEC source: 0001209191-22-019369 · doc4.xml · derivative · entry 3

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 16,634

Underlying: Common Units · 16,634 shares

Expires not disclosed

F1 · derivative.exercise_price: Each phantom unit is the economic equivalent of one common unit.

F3 · derivative.exercise_date: One-third of the phantom 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 15, 2022 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 phantom 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 phantom units.

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

F5 · balance_after: After giving effect to the transactions reported in this Report, the Reporting Person holds an aggregate 50,022 phantom units.

SEC source: 0001209191-21-023928 · doc4.xml · derivative · entry 3

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 16,666

Underlying: Common Units · 16,667 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 phantom unit is the economic equivalent of one common unit.

F4 · derivative.exercise_date: One-half of the phantom units (rounded down to the nearest whole number of units, except in the case of the final vesting date) shall vest on March 31, 2021, and the other half shall vest on March 31, 2022, 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 phantom unit, if applicable, providing for payment on the vesting date of a lump sum of cash equal to any accrued distributions from and after the grant date of the phantom units.

F5 · derivative.expiration_date: The phantom units and associated DERs do not expire. The phantom units are settled upon vesting in common units (on a one-for-one basis) or in cash, at the discretion of the Issuer.

F2 · balance_after: On November 9, 2020, the Issuer effected a 1-for-15 reverse unit split (the "Reverse Unit Split"). Pursuant to the Reverse Unit Split, common unitholders received one common unit for every 15 common units owned at the close of business on November 9, 2020. All fractional units created by the Reverse Unit Split were rounded to the nearest whole unit. The common units began trading on a split-adjusted basis on November 10, 2020. After giving effect to the Reverse Unit Split, the number of issued and outstanding common units decreased to 3,774,992.

F6 · balance_after: Total excludes phantom units from other tranches with different vesting and expiration dates.

SEC source: 0001209191-21-023928 · doc4.xml · nonDerivative · entry 2

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 12,609

F3 · shares: Common Units being withheld to pay tax liability.

SEC source: 0001209191-21-023928 · doc4.xml · nonDerivative · entry 1

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 16,667

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 phantom unit is the economic equivalent of one common unit.

F2 · balance_after: On November 9, 2020, the Issuer effected a 1-for-15 reverse unit split (the "Reverse Unit Split"). Pursuant to the Reverse Unit Split, common unitholders received one common unit for every 15 common units owned at the close of business on November 9, 2020. All fractional units created by the Reverse Unit Split were rounded to the nearest whole unit. The common units began trading on a split-adjusted basis on November 10, 2020. After giving effect to the Reverse Unit Split, the number of issued and outstanding common units decreased to 3,774,992.

SEC source: 0001209191-21-017600 · doc4.xml · derivative · entry 1

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 25,083

Underlying: Common Units · 25,083 shares

Expires not disclosed

F1 · derivative.exercise_price: Each phantom unit is the economic equivalent of one common unit.

F2 · derivative.exercise_date: One-third of the phantom 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 Reference Date (March 15, 2021), 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 phantom 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 phantom units.

F3 · derivative.expiration_date: The phantom units and associated DERs do not expire. The phantom units are settled upon vesting in common units (on a one-for-one basis) or in cash, at the discretion of the Issuer.

F4 · balance_after: Total excludes phantom units from other tranches with different vesting and expiration dates.

SEC source: 0001209191-20-050317 · doc4.xml · derivative · entry 1

Johnston James David · CIK 0001823482 · See remarks below.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 500,000

Underlying: Common Units · 500,000 shares

Expires not disclosed

F1 · derivative.exercise_price: Each phantom unit is the economic equivalent of one common unit.

F2 · derivative.exercise_date: One-half of the phantom units (rounded down to the nearest whole number of units, except in the case of the final vesting date) shall vest on March 31, 2021, and the other half shall vest on March 31, 2022, subject to continued employment and accelerated vesting as provided in the applicable award agreement. The Reporting Person will receive DERs for each phantom unit, if applicable, providing for payment on the vesting date of a lump sum of cash equal to any accrued distributions from and after the grant date of the phantom units.

F3 · derivative.expiration_date: The phantom units and associated DERs do not expire. The phantom units are settled upon vesting in common units (on a one-for-one basis) or in cash, at the discretion of the Issuer.