SCHEDULE 13D/A

Custom Truck One Source Inc

Common Stock · CUSIP: 23204X103

Event date: 2025-01-30

Reporting persons may disclose overlapping interests. Their amounts are shown individually and are not added into a filing total.

Filing-level shares

Unavailable

Percent of class

Unavailable

• ECP ControlCo, LLCReported CIK 0001707921

  Shares: 0.00 · Class: 0%

• Energy Capital Partners III, LLCReported CIK 0001621292

  Shares: 0.00 · Class: 0%

• Energy Capital Partners GP III, LPReported CIK 0001697506

  Shares: 0.00 · Class: 0%

• Energy Capital Partners III, LPReported CIK 0001594546

  Shares: 0.00 · Class: 0%

• Energy Capital Partners III-A, LPReported CIK 0001594547

  Shares: 0.00 · Class: 0%

• Energy Capital Partners III-B, LPReported CIK 0001594548

  Shares: 0.00 · Class: 0%

• Energy Capital Partners III-C, LPReported CIK 0001594549

  Shares: 0.00 · Class: 0%

• Energy Capital Partners III-D, LPReported CIK 0001594550

  Shares: 0.00 · Class: 0%

• Energy Capital Partners GP III Co-Investment (NESCO), LLCReported CIK 0001780268

  Shares: 0.00 · Class: 0%

• Energy Capital Partners III (NESCO Co-Invest), LPReported CIK 0001604735

  Shares: 0.00 · Class: 0%

• ECP Starlight Public GP, LLC

  Shares: 0.00 · Class: 0%

• ECP Starlight Guarantor (Public), LP

  Shares: 0.00 · Class: 0%

• NESCO Holdings GP, LLCReported CIK 0001779905

  Shares: 0.00 · Class: 0%

• NESCO Holdings, LPReported CIK 0001779899

  Shares: 0.00 · Class: 0%

• ECP Cardinal Holdings, LPReported CIK 0001897243

  Shares: 0.00 · Class: 0%

Amounts are as disclosed in this filing. Schedule type alone does not establish investment intent.