Energy Capital Partners Management, LP

SEC source: 0001493152-26-007762 · ownership.xml · derivative · entry 1

Energy Capital Partners Management, LP · CIK 0001815150 · Member of Section 13(d) Group

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,863

Underlying: Common Stock · 9,863 shares

Expires 2027-02-19

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of the Issuer's Common Stock.

F2 · balance_after: The securities are held of record by Energy Capital Partners Management, LP ("ECP Management"). ECP Management is controlled by its business unit committee, which consists of Douglas Kimmelman, Peter Labbat, Tyler Reeder, Murray Karp, Raoul Hughes and Xavier Robert, all of whom collectively share the power to vote and dispose of the securities held of record by ECP Management. As a result of these relationships, each of the foregoing individuals may be deemed to share beneficial ownership of the securities held of record by ECP Management. Each such individual disclaims beneficial ownership of these securities except to the extent of their pecuniary interest therein. By virtue of certain relationships among them, ECP Management may be deemed a group under Section 13(d) of the Exchange Act with ECP ControlCo, LLC. Each of them disclaims any such group membership.

SEC source: 0001493152-26-007604 · ownership.xml · derivative · entry 2

Energy Capital Partners Management, LP · CIK 0001815150 · Member of Section 13(d) Group

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 10,924 shares

Expires 2026-02-18

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 restricted stock unit represents a contingent right to receive one share of the Issuer's Common Stock.

F2 · balance_after: The securities are held of record by Energy Capital Partners Management, LP ("ECP Management"). ECP Management is controlled by its business unit committee, which consists of Douglas Kimmelman, Peter Labbat, Tyler Reeder, Murray Karp, Raoul Hughes and Xavier Robert, all of whom collectively share the power to vote and dispose of the securities held of record by ECP Management. As a result of these relationships, each of the foregoing individuals may be deemed to share beneficial ownership of the securities held of record by ECP Management. Each such individual disclaims beneficial ownership of these securities except to the extent of their pecuniary interest therein. By virtue of certain relationships among them, ECP Management may be deemed a group under Section 13(d) of the Exchange Act with ECP ControlCo, LLC. Each of them disclaims any such group membership.

SEC source: 0001493152-26-007604 · ownership.xml · nonDerivative · entry 1

Energy Capital Partners Management, LP · CIK 0001815150 · Member of Section 13(d) Group

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,675

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 restricted stock unit represents a contingent right to receive one share of the Issuer's Common Stock.

F2 · balance_after: The securities are held of record by Energy Capital Partners Management, LP ("ECP Management"). ECP Management is controlled by its business unit committee, which consists of Douglas Kimmelman, Peter Labbat, Tyler Reeder, Murray Karp, Raoul Hughes and Xavier Robert, all of whom collectively share the power to vote and dispose of the securities held of record by ECP Management. As a result of these relationships, each of the foregoing individuals may be deemed to share beneficial ownership of the securities held of record by ECP Management. Each such individual disclaims beneficial ownership of these securities except to the extent of their pecuniary interest therein. By virtue of certain relationships among them, ECP Management may be deemed a group under Section 13(d) of the Exchange Act with ECP ControlCo, LLC. Each of them disclaims any such group membership.

SEC source: 0001493152-25-007726 · ownership.xml · derivative · entry 1

Energy Capital Partners Management, LP · CIK 0001815150 · Member of Section 13(d) Group

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,924

Underlying: Common Stock · 10,924 shares

Expires 2026-02-18

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of the Issuer's Common Stock.

F2 · balance_after: Energy Capital Partners Management, LP ("ECP Management") is controlled by its business unit committee, which consists of Douglas Kimmelman, Peter Labbat, Tyler Reeder, Murray Karp, Raoul Hughes and Xavier Robert, all of whom collectively share the power to vote and dispose of the securities beneficially owned by ECP Management. As a result of these relationships, each of the foregoing individuals may be deemed to share beneficial ownership of the securities beneficially owned by ECP Management. Each such individual disclaims beneficial ownership of these securities except to the extent of their pecuniary interest therein. By virtue of certain relationships among them, ECP Management may be deemed a group under Section 13(d) of the Exchange Act with ECP ControlCo, LLC. Each of them disclaims any such group membership.

SEC source: 0001493152-25-007244 · ownership.xml · derivative · entry 2

Energy Capital Partners Management, LP · CIK 0001815150 · Member of Section 13(d) Group

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 4,751 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 restricted stock unit represents a contingent right to receive one share of the Issuer's Common Stock.

F3 · derivative.exercise_date: The restricted stock units were granted on July 30, 2024, and have no expiration date.

F3 · derivative.expiration_date: The restricted stock units were granted on July 30, 2024, and have no expiration date.

F2 · balance_after: The securities are held of record by Energy Capital Partners Management, LP ("ECP Management"). ECP Management is controlled by its business unit committee, which consists of Douglas Kimmelman, Peter Labbat, Tyler Reeder, Murray Karp, Raoul Hughes and Xavier Robert, all of whom collectively share the power to vote and dispose of the securities held of record by ECP Management. As a result of these relationships, each of the foregoing individuals may be deemed to share beneficial ownership of the securities held of record by ECP Management. Each such individual disclaims beneficial ownership of these securities except to the extent of their pecuniary interest therein. By virtue of certain relationships among them, ECP Management may be deemed a group under Section 13(d) of the Exchange Act with ECP ControlCo, LLC. Each of them disclaims any such group membership.

SEC source: 0001493152-25-007244 · ownership.xml · nonDerivative · entry 1

Energy Capital Partners Management, LP · CIK 0001815150 · Member of Section 13(d) Group

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,751

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 restricted stock unit represents a contingent right to receive one share of the Issuer's Common Stock.

F2 · balance_after: The securities are held of record by Energy Capital Partners Management, LP ("ECP Management"). ECP Management is controlled by its business unit committee, which consists of Douglas Kimmelman, Peter Labbat, Tyler Reeder, Murray Karp, Raoul Hughes and Xavier Robert, all of whom collectively share the power to vote and dispose of the securities held of record by ECP Management. As a result of these relationships, each of the foregoing individuals may be deemed to share beneficial ownership of the securities held of record by ECP Management. Each such individual disclaims beneficial ownership of these securities except to the extent of their pecuniary interest therein. By virtue of certain relationships among them, ECP Management may be deemed a group under Section 13(d) of the Exchange Act with ECP ControlCo, LLC. Each of them disclaims any such group membership.

SEC source: 0001493152-24-034395 · ownership.xml · nonDerivative · entry 1

Energy Capital Partners Management, LP · CIK 0001815150 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 0

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $4.165 to $4.185. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F2 · ownership.nature: These securities are beneficially owned by Energy Capital Partners Management, LP ("ECP Management"). ECP Management is controlled by its business unit committee, which consists of Douglas Kimmelman, Peter Labbat, Tyler Reeder, Murray Karp, Raoul Hughes and Xavier Robert, all of whom collectively share the power to vote and dispose of the securities beneficially owned by ECP Management.

SEC source: 0001213900-24-029525 · ownership.xml · derivative · entry 4

ECP ControlCo, LLC · CIK 0001707921 · Director · 10% owner

ECP Management GP, LLC · CIK 0001815147 · Director · 10% owner

Energy Capital Partners Management, LP · CIK 0001815150 · Director · 10% owner

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 22,218

Underlying: Common Stock · 22,218 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock.

F6 · derivative.exercise_date: The restricted stock units will vest on March 31, 2025 and have no expiration date.

F6 · derivative.expiration_date: The restricted stock units will vest on March 31, 2025 and have no expiration date.

F2 · ownership.nature: Represents securities held directly by Energy Capital Partners Management, LP ("ECP Management"). ECP Management GP, LLC is the general partner of ECP Management and may be deemed to share beneficial ownership of the securities held by ECP Management. ECP ControlCo, LLC ("ECP ControlCo") is the sole member of ECP Management GP, LLC. As a result, ECP ControlCo may be deemed to share beneficial ownership of the securities beneficially owned by ECP Management GP, LLC. The managing members of ECP ControlCo are Douglas Kimmelman, Andrew Singer, Peter Labbat, Tyler Reeder and Rahman D'Argenio all of whom collectively share the power to vote and dispose of the securities beneficially owned by ECP ControlCo. Each such individual disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein.

SEC source: 0001213900-24-029525 · ownership.xml · derivative · entry 3

ECP ControlCo, LLC · CIK 0001707921 · Director · 10% owner

ECP Management GP, LLC · CIK 0001815147 · Director · 10% owner

Energy Capital Partners Management, LP · CIK 0001815150 · Director · 10% owner

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 0

Underlying: Common Stock · 18,640 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 restricted stock unit represents a contingent right to receive one share of the Issuer's common stock.

F5 · derivative.exercise_date: The restricted stock units vested in full on March 31, 2024.

F5 · derivative.expiration_date: The restricted stock units vested in full on March 31, 2024.

F2 · ownership.nature: Represents securities held directly by Energy Capital Partners Management, LP ("ECP Management"). ECP Management GP, LLC is the general partner of ECP Management and may be deemed to share beneficial ownership of the securities held by ECP Management. ECP ControlCo, LLC ("ECP ControlCo") is the sole member of ECP Management GP, LLC. As a result, ECP ControlCo may be deemed to share beneficial ownership of the securities beneficially owned by ECP Management GP, LLC. The managing members of ECP ControlCo are Douglas Kimmelman, Andrew Singer, Peter Labbat, Tyler Reeder and Rahman D'Argenio all of whom collectively share the power to vote and dispose of the securities beneficially owned by ECP ControlCo. Each such individual disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein.

SEC source: 0001213900-24-029525 · ownership.xml · nonDerivative · entry 1

ECP ControlCo, LLC · CIK 0001707921 · Director · 10% owner

ECP Management GP, LLC · CIK 0001815147 · Director · 10% owner

Energy Capital Partners Management, LP · CIK 0001815150 · Director · 10% owner

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 18,640

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 restricted stock unit represents a contingent right to receive one share of the Issuer's common stock.

F2 · ownership.nature: Represents securities held directly by Energy Capital Partners Management, LP ("ECP Management"). ECP Management GP, LLC is the general partner of ECP Management and may be deemed to share beneficial ownership of the securities held by ECP Management. ECP ControlCo, LLC ("ECP ControlCo") is the sole member of ECP Management GP, LLC. As a result, ECP ControlCo may be deemed to share beneficial ownership of the securities beneficially owned by ECP Management GP, LLC. The managing members of ECP ControlCo are Douglas Kimmelman, Andrew Singer, Peter Labbat, Tyler Reeder and Rahman D'Argenio all of whom collectively share the power to vote and dispose of the securities beneficially owned by ECP ControlCo. Each such individual disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein.

SEC source: 0001213900-23-076114 · ownership.xml · nonDerivative · entry 1

ECP ControlCo, LLC · CIK 0001707921 · Director · 10% owner

ECP Management GP, LLC · CIK 0001815147 · Director · 10% owner

Energy Capital Partners Management, LP · CIK 0001815150 · Director · 10% owner

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 0

F1 · shares: Represents securities sold by Energy Capital Partners Management, LP, which were acquired as director compensation. No securities reported herein are being sold by NESCO Holdings, LP or ECP Cardinal Holdings, LP.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $6.49 to $6.55. The reporting persons undertake to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · ownership.nature: Represents securities held directly by Energy Capital Partners Management, LP ("ECP Management"). ECP Management GP, LLC is the general partner of ECP Management and may be deemed to share beneficial ownership of the securities held by ECP Management. ECP ControlCo, LLC ("ECP ControlCo") is the sole member of ECP Management GP, LLC. As a result, ECP ControlCo may be deemed to share beneficial ownership of the securities beneficially owned by ECP Management GP, LLC. The managing members of ECP ControlCo are Douglas Kimmelman, Andrew Singer, Peter Labbat, Tyler Reeder and Rahman D'Argenio all of whom collectively share the power to vote and dispose of the securities beneficially owned by ECP ControlCo. Each such individual disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein.

SEC source: 0001213900-23-075758 · ownership.xml · nonDerivative · entry 2

ECP ControlCo, LLC · CIK 0001707921 · Director · 10% owner

ECP Management GP, LLC · CIK 0001815147 · Director · 10% owner

Energy Capital Partners Management, LP · CIK 0001815150 · Director · 10% owner

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 41,140

F1 · shares: Represents securities sold by Energy Capital Partners Management, LP, which were acquired as director compensation. No securities reported herein are being sold by NESCO Holdings, LP or ECP Cardinal Holdings, LP.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $6.51 to $6.675. The reporting persons undertake to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · ownership.nature: Represents securities held directly by Energy Capital Partners Management, LP ("ECP Management"). ECP Management GP, LLC is the general partner of ECP Management and may be deemed to share beneficial ownership of the securities held by ECP Management. ECP ControlCo, LLC ("ECP ControlCo") is the sole member of ECP Management GP, LLC. As a result, ECP ControlCo may be deemed to share beneficial ownership of the securities beneficially owned by ECP Management GP, LLC. The managing members of ECP ControlCo are Douglas Kimmelman, Andrew Singer, Peter Labbat, Tyler Reeder and Rahman D'Argenio all of whom collectively share the power to vote and dispose of the securities beneficially owned by ECP ControlCo. Each such individual disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein.

SEC source: 0001213900-23-075758 · ownership.xml · nonDerivative · entry 1

ECP ControlCo, LLC · CIK 0001707921 · Director · 10% owner

ECP Management GP, LLC · CIK 0001815147 · Director · 10% owner

Energy Capital Partners Management, LP · CIK 0001815150 · Director · 10% owner

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 89,434

F1 · shares: Represents securities sold by Energy Capital Partners Management, LP, which were acquired as director compensation. No securities reported herein are being sold by NESCO Holdings, LP or ECP Cardinal Holdings, LP.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $6.70 to $6.75. The reporting persons undertake to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · ownership.nature: Represents securities held directly by Energy Capital Partners Management, LP ("ECP Management"). ECP Management GP, LLC is the general partner of ECP Management and may be deemed to share beneficial ownership of the securities held by ECP Management. ECP ControlCo, LLC ("ECP ControlCo") is the sole member of ECP Management GP, LLC. As a result, ECP ControlCo may be deemed to share beneficial ownership of the securities beneficially owned by ECP Management GP, LLC. The managing members of ECP ControlCo are Douglas Kimmelman, Andrew Singer, Peter Labbat, Tyler Reeder and Rahman D'Argenio all of whom collectively share the power to vote and dispose of the securities beneficially owned by ECP ControlCo. Each such individual disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein.

SEC source: 0001213900-23-027267 · ownership.xml · derivative · entry 4

ECP ControlCo, LLC · CIK 0001707921 · Director · 10% owner

ECP Management GP, LLC · CIK 0001815147 · Director · 10% owner

Energy Capital Partners Management, LP · CIK 0001815150 · Director · 10% owner

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 18,640

Underlying: Common Stock · 18,640 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock.

F5 · derivative.exercise_date: The restricted stock units will vest on March 31, 2024 and have no expiration date.

F5 · derivative.expiration_date: The restricted stock units will vest on March 31, 2024 and have no expiration date.

F2 · ownership.nature: Represents securities held directly by Energy Capital Partners Management, LP ("ECP Management"). ECP Management GP, LLC is the general partner of ECP Management and may be deemed to share beneficial ownership of the securities held by ECP Management. ECP ControlCo, LLC ("ECP ControlCo") is the sole member of ECP Management GP, LLC. As a result, ECP ControlCo may be deemed to share beneficial ownership of the securities beneficially owned by ECP Management GP, LLC. The managing members of ECP ControlCo are Douglas Kimmelman, Andrew Singer, Peter Labbat, Tyler Reeder and Rahman D'Argenio all of whom collectively share the power to vote and dispose of the securities beneficially owned by ECP ControlCo. Each such individual disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein.

SEC source: 0001213900-23-027267 · ownership.xml · derivative · entry 3

ECP ControlCo, LLC · CIK 0001707921 · Director · 10% owner

ECP Management GP, LLC · CIK 0001815147 · Director · 10% owner

Energy Capital Partners Management, LP · CIK 0001815150 · Director · 10% owner

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 0

Underlying: Common Stock · 14,315 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 restricted stock unit represents a contingent right to receive one share of the Issuer's common stock.

F2 · derivative.exercise_date: Represents securities held directly by Energy Capital Partners Management, LP ("ECP Management"). ECP Management GP, LLC is the general partner of ECP Management and may be deemed to share beneficial ownership of the securities held by ECP Management. ECP ControlCo, LLC ("ECP ControlCo") is the sole member of ECP Management GP, LLC. As a result, ECP ControlCo may be deemed to share beneficial ownership of the securities beneficially owned by ECP Management GP, LLC. The managing members of ECP ControlCo are Douglas Kimmelman, Andrew Singer, Peter Labbat, Tyler Reeder and Rahman D'Argenio all of whom collectively share the power to vote and dispose of the securities beneficially owned by ECP ControlCo. Each such individual disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein.

F2 · derivative.expiration_date: Represents securities held directly by Energy Capital Partners Management, LP ("ECP Management"). ECP Management GP, LLC is the general partner of ECP Management and may be deemed to share beneficial ownership of the securities held by ECP Management. ECP ControlCo, LLC ("ECP ControlCo") is the sole member of ECP Management GP, LLC. As a result, ECP ControlCo may be deemed to share beneficial ownership of the securities beneficially owned by ECP Management GP, LLC. The managing members of ECP ControlCo are Douglas Kimmelman, Andrew Singer, Peter Labbat, Tyler Reeder and Rahman D'Argenio all of whom collectively share the power to vote and dispose of the securities beneficially owned by ECP ControlCo. Each such individual disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein.

F2 · ownership.nature: Represents securities held directly by Energy Capital Partners Management, LP ("ECP Management"). ECP Management GP, LLC is the general partner of ECP Management and may be deemed to share beneficial ownership of the securities held by ECP Management. ECP ControlCo, LLC ("ECP ControlCo") is the sole member of ECP Management GP, LLC. As a result, ECP ControlCo may be deemed to share beneficial ownership of the securities beneficially owned by ECP Management GP, LLC. The managing members of ECP ControlCo are Douglas Kimmelman, Andrew Singer, Peter Labbat, Tyler Reeder and Rahman D'Argenio all of whom collectively share the power to vote and dispose of the securities beneficially owned by ECP ControlCo. Each such individual disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein.

SEC source: 0001213900-23-027267 · ownership.xml · nonDerivative · entry 1

ECP ControlCo, LLC · CIK 0001707921 · Director · 10% owner

ECP Management GP, LLC · CIK 0001815147 · Director · 10% owner

Energy Capital Partners Management, LP · CIK 0001815150 · Director · 10% owner

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 135,094

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 restricted stock unit represents a contingent right to receive one share of the Issuer's common stock.

F2 · ownership.nature: Represents securities held directly by Energy Capital Partners Management, LP ("ECP Management"). ECP Management GP, LLC is the general partner of ECP Management and may be deemed to share beneficial ownership of the securities held by ECP Management. ECP ControlCo, LLC ("ECP ControlCo") is the sole member of ECP Management GP, LLC. As a result, ECP ControlCo may be deemed to share beneficial ownership of the securities beneficially owned by ECP Management GP, LLC. The managing members of ECP ControlCo are Douglas Kimmelman, Andrew Singer, Peter Labbat, Tyler Reeder and Rahman D'Argenio all of whom collectively share the power to vote and dispose of the securities beneficially owned by ECP ControlCo. Each such individual disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein.

SEC source: 0001213900-22-023732 · ownership.xml · derivative · entry 1

ECP ControlCo, LLC · CIK 0001707921 · Director · 10% owner

ECP Management GP, LLC · CIK 0001815147 · Director · 10% owner

Energy Capital Partners Management, LP · CIK 0001815150 · Director · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 14,315

Underlying: Common Stock · 14,315 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock.

F2 · derivative.exercise_date: The restricted stock units will vest on March 31, 2023 and have no expiration date.

F2 · derivative.expiration_date: The restricted stock units will vest on March 31, 2023 and have no expiration date.

F3 · ownership.nature: Represents securities held directly by Energy Capital Partners Management, LP ("ECP Management"). ECP Management GP, LLC is the general partner of ECP Management and may be deemed to share beneficial ownership of the securities held by ECP Management. ECP ControlCo, LLC ("ECP ControlCo") is the sole member of ECP Management GP, LLC. As a result, ECP ControlCo may be deemed to share beneficial ownership of the securities beneficially owned by ECP Management GP, LLC. The managing members of ECP ControlCo are Douglas Kimmelman, Andrew Singer, Peter Labbat, Tyler Reeder and Rahman D'Argenio all of whom collectively share the power to vote and dispose of the securities beneficially owned by ECP ControlCo. Each such individual disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein.

SEC source: 0001213900-22-018291 · ownership.xml · derivative · entry 6

ECP ControlCo, LLC · CIK 0001707921 · Director · 10% owner

ECP Management GP, LLC · CIK 0001815147 · Director · 10% owner

Energy Capital Partners Management, LP · CIK 0001815150 · Director · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 0

Underlying: Common Stock · 13,631 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.

F3 · derivative.exercise_price: Represents securities held directly by 21,238,988 shares held by NESCO Holdings, LP and 4,500,000 shares held by ECP Cardinal Holdings, LP

F6 · derivative.exercise_date: The restricted stock units vested in full on April 1, 2022.

F6 · derivative.expiration_date: The restricted stock units vested in full on April 1, 2022.

F1 · ownership.nature: Represents securities held directly by Energy Capital Partners Management, LP ("ECP Management"). ECP Management GP, LLC is the general partner of ECP Management and may be deemed to share beneficial ownership of the securities held by ECP Management.

F5 · ownership.nature: ECP ControlCo, LLC ("ECP ControlCo") is the managing member of ECP III GP LLC and the sole member of ECP Management GP, LLC. As a result, ECP ControlCo may be deemed to share beneficial ownership of the securities beneficially owned by ECP III GP LLC and ECP Management GP, LLC. The managing members of ECP ControlCo are Douglas Kimmelman, Andrew Singer, Peter Labbat, Tyler Reeder and Rahman D'Argenio all of whom collectively share the power to vote and dispose of the securities beneficially owned by ECP ControlCo. Each such individual disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein.

SEC source: 0001213900-22-018291 · ownership.xml · nonDerivative · entry 3

ECP ControlCo, LLC · CIK 0001707921 · Director · 10% owner

ECP Management GP, LLC · CIK 0001815147 · Director · 10% owner

Energy Capital Partners Management, LP · CIK 0001815150 · Director · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 120,779

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 restricted stock unit represents a contingent right to receive one share of the Issuer's common stock.

F1 · ownership.nature: Represents securities held directly by Energy Capital Partners Management, LP ("ECP Management"). ECP Management GP, LLC is the general partner of ECP Management and may be deemed to share beneficial ownership of the securities held by ECP Management.

F5 · ownership.nature: ECP ControlCo, LLC ("ECP ControlCo") is the managing member of ECP III GP LLC and the sole member of ECP Management GP, LLC. As a result, ECP ControlCo may be deemed to share beneficial ownership of the securities beneficially owned by ECP III GP LLC and ECP Management GP, LLC. The managing members of ECP ControlCo are Douglas Kimmelman, Andrew Singer, Peter Labbat, Tyler Reeder and Rahman D'Argenio all of whom collectively share the power to vote and dispose of the securities beneficially owned by ECP ControlCo. Each such individual disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein.

SEC source: 0001213900-22-018291 · ownership.xml · derivative · entry 5

ECP ControlCo, LLC · CIK 0001707921 · Director · 10% owner

ECP Management GP, LLC · CIK 0001815147 · Director · 10% owner

Energy Capital Partners Management, LP · CIK 0001815150 · Director · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 0

Underlying: Common Stock · 80,000 shares

Expires 2030-06-11

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 · ownership.nature: Represents securities held directly by Energy Capital Partners Management, LP ("ECP Management"). ECP Management GP, LLC is the general partner of ECP Management and may be deemed to share beneficial ownership of the securities held by ECP Management.

F5 · ownership.nature: ECP ControlCo, LLC ("ECP ControlCo") is the managing member of ECP III GP LLC and the sole member of ECP Management GP, LLC. As a result, ECP ControlCo may be deemed to share beneficial ownership of the securities beneficially owned by ECP III GP LLC and ECP Management GP, LLC. The managing members of ECP ControlCo are Douglas Kimmelman, Andrew Singer, Peter Labbat, Tyler Reeder and Rahman D'Argenio all of whom collectively share the power to vote and dispose of the securities beneficially owned by ECP ControlCo. Each such individual disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein.

SEC source: 0001213900-22-018291 · ownership.xml · nonDerivative · entry 2

ECP ControlCo, LLC · CIK 0001707921 · Director · 10% owner

ECP Management GP, LLC · CIK 0001815147 · Director · 10% owner

Energy Capital Partners Management, LP · CIK 0001815150 · Director · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 107,148

F1 · ownership.nature: Represents securities held directly by Energy Capital Partners Management, LP ("ECP Management"). ECP Management GP, LLC is the general partner of ECP Management and may be deemed to share beneficial ownership of the securities held by ECP Management.

F5 · ownership.nature: ECP ControlCo, LLC ("ECP ControlCo") is the managing member of ECP III GP LLC and the sole member of ECP Management GP, LLC. As a result, ECP ControlCo may be deemed to share beneficial ownership of the securities beneficially owned by ECP III GP LLC and ECP Management GP, LLC. The managing members of ECP ControlCo are Douglas Kimmelman, Andrew Singer, Peter Labbat, Tyler Reeder and Rahman D'Argenio all of whom collectively share the power to vote and dispose of the securities beneficially owned by ECP ControlCo. Each such individual disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein.

SEC source: 0001213900-22-018291 · ownership.xml · nonDerivative · entry 1

ECP ControlCo, LLC · CIK 0001707921 · Director · 10% owner

ECP Management GP, LLC · CIK 0001815147 · Director · 10% owner

Energy Capital Partners Management, LP · CIK 0001815150 · Director · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 140,000

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 · ownership.nature: Represents securities held directly by Energy Capital Partners Management, LP ("ECP Management"). ECP Management GP, LLC is the general partner of ECP Management and may be deemed to share beneficial ownership of the securities held by ECP Management.

F5 · ownership.nature: ECP ControlCo, LLC ("ECP ControlCo") is the managing member of ECP III GP LLC and the sole member of ECP Management GP, LLC. As a result, ECP ControlCo may be deemed to share beneficial ownership of the securities beneficially owned by ECP III GP LLC and ECP Management GP, LLC. The managing members of ECP ControlCo are Douglas Kimmelman, Andrew Singer, Peter Labbat, Tyler Reeder and Rahman D'Argenio all of whom collectively share the power to vote and dispose of the securities beneficially owned by ECP ControlCo. Each such individual disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein.

SEC source: 0001213900-21-020238 · ownership.xml · derivative · entry 4

ECP ControlCo, LLC · CIK 0001707921 · Director · 10% owner

ECP Management GP, LLC · CIK 0001815147 · Director · 10% owner

Energy Capital Partners Management, LP · CIK 0001815150 · Director · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 0

Underlying: Common Stock · 60,000 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.

F5 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock.

F7 · derivative.exercise_date: In connection with the acquisition of Custom Truck One Source, L.P. by the Issuer, these restricted stock units automatically vested.

F7 · derivative.expiration_date: In connection with the acquisition of Custom Truck One Source, L.P. by the Issuer, these restricted stock units automatically vested.

F2 · ownership.nature: Represents securities held directly by the following entities in the following amounts: NESCO Holdings, LP - 21,238,988, Energy Capital Partners III, LP ("ECP III") - 64,450, Energy Capital Partners III-A, LP ("III-A") - 2,169,601, Energy Capital Partners III-B, LP ("III-B") - 262,015, Energy Capital Partners III-C, LP ("III-C") - 896,947, Energy Capital Partners III-D, LP ("III-D") - 1,106,987.

F3 · ownership.nature: The general partner of NESCO Holdings, LP is NESCO Holdings GP, LLC. The members of NESCO Holdings GP, LLC are ECP III, III-A, III-B, III-C, III-D, and Energy Capital Partners III (NESCO Co-Invest), LP ("NESCO Co-Invest"). The general partner of ECP III, III-A, III-B, III-C, and III-D is Energy Capital Partners GP III, LP ("ECP III GP LP"), and the general partner of ECP III GP LP is Energy Capital Partners III, LLC ("ECP III GP LLC"). The general partner of NESCO Co-Invest is Energy Capital Partners GP III Co-Investment (NESCO), LLC, and the managing member of Energy Capital Partners GP III Co-Investment (NESCO), LLC is ECP III GP LLC. As a result, each of the foregoing entities may be deemed to share beneficial ownership of the securities held by Nesco Holdings, LP.

F4 · ownership.nature: ECP ControlCo, LLC ("ECP ControlCo") is the managing member of ECP III GP LLC and the sole member of ECP Management GP, LLC. As a result, ECP ControlCo may be deemed to share beneficial ownership of the securities beneficially owned by ECP III GP LLC and ECP Management GP, LLC. The managing members of ECP ControlCo are Douglas Kimmelman, Andrew Singer, Peter Labbat, Tyler Reeder and Rahman D'Argenio all of whom collectively share the power to vote and dispose of the securities beneficially owned by ECP ControlCo. Each such individual disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein.

SEC source: 0001213900-21-020238 · ownership.xml · derivative · entry 3

ECP ControlCo, LLC · CIK 0001707921 · Director · 10% owner

ECP Management GP, LLC · CIK 0001815147 · Director · 10% owner

Energy Capital Partners Management, LP · CIK 0001815150 · Director · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 13,631

Underlying: Common Stock · 13,631 shares

Expires not disclosed

F5 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock.

F6 · derivative.exercise_date: The restricted stock units will vest on March 31, 2022 and have no expiration date.

F6 · derivative.expiration_date: The restricted stock units will vest on March 31, 2022 and have no expiration date.

F1 · ownership.nature: Represents securities held directly by Energy Capital Partners Management, LP ("ECP Management"). Each of Jennifer Gray, Rahman D'Argenio, Matthew Himler and Douglas Kimmelman have entered into an agreement with ECP Mangement pursuant to which he or she has irrevocably assigned any and all compensation, including the equity award reported herein, that he or she may receive from serving as a director of the Issuer to ECP Management. ECP Management GP, LLC is the general partner of ECP Management and may be deemed to share beneficial ownership of the securities held by ECP Management.

F4 · ownership.nature: ECP ControlCo, LLC ("ECP ControlCo") is the managing member of ECP III GP LLC and the sole member of ECP Management GP, LLC. As a result, ECP ControlCo may be deemed to share beneficial ownership of the securities beneficially owned by ECP III GP LLC and ECP Management GP, LLC. The managing members of ECP ControlCo are Douglas Kimmelman, Andrew Singer, Peter Labbat, Tyler Reeder and Rahman D'Argenio all of whom collectively share the power to vote and dispose of the securities beneficially owned by ECP ControlCo. Each such individual disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein.

SEC source: 0001213900-21-020238 · ownership.xml · nonDerivative · entry 1

ECP ControlCo, LLC · CIK 0001707921 · Director · 10% owner

ECP Management GP, LLC · CIK 0001815147 · Director · 10% owner

Energy Capital Partners Management, LP · CIK 0001815150 · Director · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 60,000

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 · ownership.nature: Represents securities held directly by Energy Capital Partners Management, LP ("ECP Management"). Each of Jennifer Gray, Rahman D'Argenio, Matthew Himler and Douglas Kimmelman have entered into an agreement with ECP Mangement pursuant to which he or she has irrevocably assigned any and all compensation, including the equity award reported herein, that he or she may receive from serving as a director of the Issuer to ECP Management. ECP Management GP, LLC is the general partner of ECP Management and may be deemed to share beneficial ownership of the securities held by ECP Management.

F4 · ownership.nature: ECP ControlCo, LLC ("ECP ControlCo") is the managing member of ECP III GP LLC and the sole member of ECP Management GP, LLC. As a result, ECP ControlCo may be deemed to share beneficial ownership of the securities beneficially owned by ECP III GP LLC and ECP Management GP, LLC. The managing members of ECP ControlCo are Douglas Kimmelman, Andrew Singer, Peter Labbat, Tyler Reeder and Rahman D'Argenio all of whom collectively share the power to vote and dispose of the securities beneficially owned by ECP ControlCo. Each such individual disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein.